[0001]The present invention relates to a sheet-state detecting device and a paper sheet state detecting method. More particularly, the bill or gift certificates, checks, of the preferred paper sheet state detecting device and a paper sheet state detection method to determine the state of the paper sheet such as a card-like medium ones.
BACKGROUND
[0002]Conventionally, ultrasonic waves are transmitted to the paper sheet, using the data obtained by receiving the ultrasonic waves transmitted through or reflected by the paper sheet, the state of the paper sheet, for example, a technique for detecting a tear-known ing.
[0003]
For example, Patent Document 1, the fatigue of the sheet-like medium (wrinkles, according, tear, etc.) as a technique for detecting an ultrasonic transmitting element for transmitting ultrasonic waves as burst waves, and the ultrasonic receiving element, receives medium fatigue detection device and a sensitivity detection unit is disclosed. Further, Patent Document 1 discloses that to incident ultrasound at an angle of 5 ° or more with respect to the normal direction of a principal face of the sheet-like medium.
[0004]
Further, Patent Document 2, an ultrasonic transducer, the ultrasonic sensor sheet inspection and a holder ultrasonic channel is formed in which the ultrasonic transducer is disposed is disclosed. In this ultrasonic sensor sheet inspection, the holder has a non-fibrous surface layer adjacent to the ultrasound channel, the impedance of the non-fibrous surface layer is smaller than the impedance of the surface layer of the adjacent holder there.
CITATION
Patent Document
[0005]
Patent Document 1: WO 2008/105291 Patent
Patent Document 2: U.S. Patent No. 8,230,742
Summary of the Invention
Problems that the Invention is to Solve
[0006]
However, ultrasound is attenuated to approximately 1/100 when passing through the sheet, also has the property that goes around from the end portion of the sheet. Therefore, when the ultrasonic wave component transmitted through the sheet, wrapping around the end without passing through the ultrasonic component interferes, it becomes very large noise.
[0007]
In the case of using a pair of ultrasonic transmitting elements and ultrasonic receiving elements for detecting the sheets entirely dead zone without arraying a plurality, ultrasound interference is likely to occur, large the effect. Placing tilting the respective elements of each set, as described in Patent Document 1, the influence of the ultrasonic interference becomes particularly large. Further, when the incident ultrasonic waves obliquely with respect to the paper sheet, the influence of noise caused by the variation in the dynamic characteristics of the sheet such transport during flutter or undulation of sheet becomes enormous.
[0008]
When such noise is generated, or can not detect the state of the paper sheet, or a factor that the detection accuracy decreases.
[0009]
The present invention has been made in view of the above circumstances, and aims to provide a paper sheet state detection device and a paper sheet state detection method capable of detecting the state of the paper sheet highly accurately it is intended to.
Means for Solving the Problems
[0010]
The present invention relates to a sheet state detection device for detecting the state of the paper sheet while conveying the paper sheet to be detected, and the ultrasonic transmitting element, and the ultrasonic receiving device, the ultrasonic transmission a transmission control section for controlling the timing of the transmission of the device, based on the ultrasonic signals received by the ultrasonic receiving elements, characterized in that it comprises a detection unit for detecting the state of the paper sheet.
[0011]
Further, in the above invention, the paper sheet state detection device, the ultrasonic transmission device and the ultrasonic receiving element at least 2 Kumisonae, the transmission control unit, at least two ultrasound transmitting element and controlling the timing of the transmission independently of each other.
[0012]
Further, in the above invention, in the above each pair of ultrasonic transmitting elements and the ultrasonic receiving device, the ultrasonic transmitting element, said being disposed opposite to the ultrasonic receiving device, the paper sheet s state detection device, between at least one pair of ultrasonic transmitting elements and ultrasonic receiving elements, further comprising a conveying unit to convey the paper sheet, the transmission control unit does not overlap the paper sheet and controlling the timing of transmission of the ultrasonic transmitting element.
[0013]
Further, in the above invention, the transmission control unit has a first ultrasonic wave transmitting element overlaps with the paper sheet, and a second ultrasonic transmission element does not overlap the paper sheet, the and performing control to sequentially transmitted.
[0014]
Further, in the above invention, the first ultrasonic transmission element and the second said ultrasonic transmitting elements are arranged adjacently, the first ultrasonic transmission element of the paper sheet characterized in that it overlaps the end portion.
[0015]
Further, in the above invention, the transmission control unit, the ultrasonic wave transmitting element does not overlap the paper sheet, and performing control not to transmit to overlap the paper sheet.
[0016]
Further, in the above invention, the paper sheet state detecting apparatus further comprises an optical line sensor for obtaining an optical image information of the paper sheet, the transmission control unit is acquired by the optical line sensor It was based on the optical image information of the paper sheet, and controls the timing of transmission of the at least two ultrasound transmitting element.
[0017]
Further, in the above invention, the ultrasonic transmitting element and the ultrasonic receiver element is characterized by being arranged to directly face the conveying surface of the paper sheet.
[0018]
Further, in the above invention, the ultrasonic transmitting elements and the said ultrasonic signal ultrasound component that is multiply reflected between the paper sheet wherein the ultrasonic wave transmitting element located between the ultrasonic receiver element further comprising: a reception control unit that controls not used as.
[0019]
Further, in the above invention, the paper sheet state detection device, the ultrasonic transmitting element and the ultrasonic wave receiving element at least 2 Kumisonae and provided between the ultrasonic wave transmitting element adjacent a shielding wall, and further comprising at least one of the shielding wall provided between the ultrasonic receiving elements adjacent.
[0020]
Further, in the above invention, the paper sheet is characterized in that it is a banknote.
[0021]
Further, in the above invention, the detection unit, and detects the fatigue of the paper sheet.
[0022]
Further, the present invention provides a sheet state detecting method for detecting the state of the paper sheet while conveying the paper sheet is detected, the transmission control step of controlling the timing of transmission of the ultrasonic wave transmitting element If, based on the ultrasonic signals received by the ultrasonic receiving elements, characterized in that it comprises a detection step of detecting a state of the paper sheet.
[0023]
Further, in the above invention, in the transmission control step, to control independently of each other the timing of transmission of the at least two ultrasound transmitting element constituting at least two pairs of ultrasonic transmitting elements and ultrasonic receiving elements it is characterized in.
Effect of the invention
[0024]
According to the paper sheet state detecting device and a paper sheet state detecting method of the present invention, it is possible to detect the state of the paper sheet with high accuracy.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025]
[Figure 1] is a schematic view of an ultrasonic sensor according to Embodiment 1, (a) shows a cross-sectional view, (b) show a plan view.
It is a perspective schematic view of an ultrasonic sensor according to [2] Embodiment 1.
3 is a cross-sectional schematic view of an ultrasonic sensor according to the first embodiment.
[Figure 4] ultrasonic transmitting element of the ultrasonic sensor according to Embodiment 1 is a perspective schematic view of the ultrasonic receiving elements and sensor mounting board.
5 is a schematic perspective view of the housing of the ultrasonic sensor according to the first embodiment.
6 is a schematic plan view of an ultrasonic sensor in a first evaluation test.
[Figure 7] is a graph showing an ultrasonic signal obtained by the first evaluation test, and shows superimposed the results of 10 times the same measurement.
[FIG. 8] (a) and (b) is a schematic plan view of the ultrasonic transmitting element of the ultrasonic sensor according to the first embodiment.
9 is a schematic plan view of an ultrasonic sensor according to a second evaluation test.
[Figure 10] is a graph showing an ultrasonic signal obtained by the second evaluation test, and shows superimposed the results of 10 times the same measurement.
11 is a schematic plan view of an ultrasonic sensor in the third evaluation test.
[Figure 12] is a graph showing the ultrasonic signal obtained in the third evaluation test, and shows superimposed the result of similar measurement 10 times.
13 is a schematic plan view of an ultrasonic sensor in the evaluation tests of the fourth.
[Figure 14] is a graph showing the ultrasonic signal obtained in the evaluation tests of the fourth, there is shown superimposed the results of 10 times the same measurement.
15 is a partial cross-sectional schematic view of an ultrasonic sensor according to the second embodiment.
16 is a partial cross-sectional schematic view of an ultrasonic sensor according to the first embodiment.
[Figure 17] is a graph showing the ultrasonic signal obtained in the evaluation tests of the fifth, there is shown superimposed the results of 10 times the same measurement.
[18] Sixth a graph showing an ultrasonic signal obtained by the evaluation test, and shows superimposed the results of 10 times the same measurement.
[19] on the variation of the output of the ultrasonic signal obtained by the ultrasonic sensor is a diagram for explaining a test to assess the impact of the incident angle of the ultrasonic wave with respect to the bill, (a) represents, this study it is a side schematic view of the element pair and the bill in, (b) are graphs showing the relationship between the variation in the output and the incident angle of the ultrasonic wave with respect to the bill.
[Figure 20] is a schematic plan view of an ultrasonic sensor according to Embodiment 1 is a diagram for explaining the mutual positional relationship between the ultrasonic wave transmitting element, an ultrasonic receiving elements and shielding wall.
[FIG. 21] (a) is a schematic perspective view showing an appearance of a sheet-state detecting device according to the first embodiment, (b) the structure overview of the internal sheet state detection device according to Embodiment 1 is a cross-sectional view schematically showing a.
[Figure 22] is a schematic view of a sensor unit portion of the sheet state detection device according to Embodiment 1, (a) shows a cross-sectional view, (b) show a plan view.
It is a functional block diagram of a sheet state detection device according to [23] Embodiment 1.
It is a flowchart showing determination processing of the paper sheet to be performed by the FIG. 24 a sheet state detection device according to the first embodiment.
It is a schematic diagram for explaining a measuring method of FIG. 25 bill fatigue (dripping degree).
FIG. 26 is a perspective schematic view of an ultrasonic sensor according to the second embodiment.
FIG. 27 is a cross-sectional schematic view of an ultrasonic sensor according to the second embodiment.
[FIG. 28] is a cross-sectional schematic view of an ultrasonic sensor in the evaluation tests of the seventh.
FIG. 29 is a schematic plan view of an ultrasonic sensor in the evaluation tests of the seventh.
[FIG. 30] is a schematic plan view of an ultrasonic sensor in the evaluation test of the eighth.
[Figure 31] is a graph showing an ultrasonic signal obtained by the evaluation test of the seventh, there is shown superimposed the result of several times the same measurement.
[Figure 32] is a graph showing an ultrasonic signal obtained by the evaluation test of the eighth, there is shown superimposed the result of several times the same measurement.
DESCRIPTION OF THE INVENTION
[0026]
(Embodiment 1)
Hereinafter, with reference to the drawings, a preferred embodiment of a sheet-state detecting device and a paper sheet state detecting method according to the present invention will be described in detail. First, a description will be given ultrasonic sensor sheet state detection device according to the present embodiment. Ultrasonic sensor has a function of transmitting ultrasonic waves to the paper sheet being conveyed, and receives an ultrasonic wave transmitted through the paper leaf to output an ultrasonic signal, according to the present embodiment Paper within sheet state detection device, the ultrasonic signal from the sheet by extracting a feature of the state, in particular is utilized to detect fatigue.
[0027]
Sheet state detection device according to the present embodiment includes an ultrasonic sensor (ultrasonic sensor unit) 10 shown in FIGS. Ultrasonic sensor 10 transmits ultrasonic waves to the paper sheet 100 being conveyed, in which it receives the ultrasonic waves transmitted through the sheet 100 to output the ultrasound signal. The conveying direction of the sheet 100 and the X-axis negative direction, the Z-axis an axis perpendicular to the conveying surface, Y-axis shall be perpendicular to the X axis and the Z-axis. Further, the paper sheet 100 is assumed to be substantially parallel to the transport and the transport plane, the Z-axis positive upward, the Z-axis negative side is referred to below.
[0028]
The type of the paper sheet 100 is not particularly limited, for example, paper money and gift certificates, checks, securities, and a card-like medium, and the like. Also, the paper used for banknotes, but mainstream paper and plant fiber material, durability and water resistance, for the purpose of improving security etc., synthetic fibers paper and that the material is a sheet of synthetic resin polymer sheet may be used. Bill made from a polymer sheet is referred to as the polymer banknotes. Among them, as the paper sheet 100, is preferably one formed from the paper in which the plant fiber material.
[0029]
Ultrasonic sensor 10 includes a transmitter 11 and the receiver 12 faces in between the conveying surface, respectively provided in the transmitter 11 and the receiver 12, a plurality of the conveying section 55 for conveying the paper sheet 100 and a roller 55a, the paper sheet 100 is conveyed between the transmitter 11 and the receiver 12 by the roller 55a. Transmitter 11 includes a housing 13, a plurality of ultrasonic transmitting elements (hereinafter, simply referred to as transmission elements.) And 21, and a sensor mounting board 31 transmitting element 21 is mounted, the transmission element 21 and the sensor mounting board 31 is accommodated in a housing 13. Receiver 12 includes a housing 14, ultrasonic receiving element of the same number as the transmission element 21 (hereinafter, simply referred to as the receiving element.) 22, a sensor mounting board 32 that the receiving element 22 is mounted, the sensor mounting board 32 and a connected amplifier board 33, the receiving element 22, the sensor mounting board 32 and the amplifier board 33 are accommodated in the housing 14. Thus, the ultrasonic sensor 10 includes a plurality of sets of pair of transmission elements 21 and receiving elements 22. Hereinafter also referred to as each set of transmission elements 21 and receiving elements 22 and element pairs 25.
[0030]
Incidentally, the location of the transmitter 11 and the receiver 12 are mutually interchangeable, the transmission unit 11 upward, the receiving portion 12 downward may be disposed respectively. Further, in FIG. 2, for clarity of illustration, it is shown to expand the distance between the transmitter 11 and the receiver 12.
[0031]
Transmission element 21 is for transmitting ultrasonic waves on the basis of the input signal, the receiving element 22, but is intended to receive an ultrasonic wave, both provided with a piezoelectric element as a vibrator, for example, a piezoelectric ceramic element . Transmitting element 21 and the receiving element 22 is disposed toward the conveying surface, each receiving element 22, so that it can receive the ultrasonic waves transmitted from 21 (transmitting element pairs) corresponding transmission elements from the front, its orientation and position are set. More particularly, the receiving surface (detection surface) 24 of the receiving element 22 faces the transmitting surface (detection surface) 23 of the corresponding transmission device 21, an ultrasonic emitting surface of the piezoelectric element of each receiving element 22 faces the ultrasonic emitting surface of the piezoelectric element corresponding transmission element 21. Preferably, the central axis of each receiving element 22, and the central axis of the corresponding transmission elements 21 are arranged substantially on the same straight line.
[0032]
To reduce the effect of multiple reflection of the ultrasonic waves between the sheet 100 and the transmission elements 21, each transmission element 21 is disposed some distance from 22 (the receiving element pairs) corresponding receiving element . If the distance between them is too small, there is a possibility that a noise source remains ultrasound after reception of ultrasound by the receiving device 22 is multiple reflection. Further, the paper sheet 100 is conveyed to the substantially central between each element pair 25.
[0033]
The paper sheet 100 over the entire surface in order to detect without dead zone, as shown in FIG. 1 (b), 2 and 4, element pair 25, a plurality of rows in a staggered manner (hereinafter, also referred to as stage columns.) are arranged, the element pair 25, a plurality of rows in the X-axis direction, for example two rows, are arranged. Furthermore, element pair 25 is disposed over a wider range than the width of the paper sheet 100 in the Y-axis direction. Element pair 25 are arranged at equal intervals in the Y-axis direction in each stage. Different stage element pair 25 in between is are located at different positions in the Y-axis direction, the pitch of the element pairs 25 in the Y-axis direction of all of the stages is constant. Thus, in the Y-axis direction is disposed element pairs 25 to cover the entire sheet 100, and element pair 25 of each stage so as to fill the gap of the element pair 25 next to the stage is located are therefore, in the sheet 100 over the entire surface, the information can be detected without dead zone, for example, it can be detected even a slight tearing of the paper sheet 100.
[0034]
As shown in FIGS. 1 to 3 and 5, the facing portion which faces the conveying surface of the housing 13, at a position corresponding to the transmission element 21, a plurality of rows, apertures 15 are provided in a staggered manner. Similarly, the opposing portion facing the conveying surface of the housing 14, at a position corresponding to the receiving element 22, a plurality of rows in a staggered manner, an opening 16 is provided. Each transmission element 21, through the corresponding openings 15 and 16, towards the corresponding receiving element 22 for transmitting ultrasonic waves. Further, as shown in FIG. 5, the housing 13 and 14, respectively, openings 17 and 18 for exposing the rollers 55a are provided.
[0035]
Roller 55a is driven by a drive device (not shown) such as a motor, to transport the sheet 100 by the ultrasonic sensor 10.. Paper sheet 100 is conveyed by a plurality of rollers 55a provided in the ultrasonic sensor 10, it passes between the transmitter 11 and the receiver 12, and is discharged to the ultrasonic sensor 10 outside. Each roller 55a, by either of the clockwise and counterclockwise are rotatably mounted, the rotation of these rollers 55a is controlled by the transport control section described later, the paper sheet 100, X-axis It is conveyed to the negative direction.
[0036]
The transport direction of the sheet 100 (X-axis direction), or is not particularly limited becomes one To a direction parallel to the longitudinal direction or the lateral direction of the paper sheet 100. Transfer method of the paper sheet 100 that includes a conveying direction and the conveying speed or the like may be suitably determined depending on the use of the paper sheet state detection device according to the present embodiment.
[0037]
The sensor mounting board 31, in addition to transmission element 21, the input signal being a transmission circuit for generating a (driving signal) is mounted transmission element 21, the sensor mounting board 32, in addition to the receiving element 22, the receiving element 22 an amplifier circuit for amplifying processing the received ultrasonic signal is implemented in. In addition, the amplifier board 33, circuits for signal processing the ultrasonic signal is implemented.
[0038]
Transmission element 21, as shown in FIG. 1 (b), are distributed to three or more element groups. In FIG. 1 (b), shows an example of distributing the four element group, are given different patterns for the transmission element 21 of different element groups. Element group is dynamic (alternating) transmission control by the transmission controller to be described later. That is, the transmission control unit transmits control while rotation of 3 or more element groups are simultaneously transmitted control multiple transmission elements 21 belonging to the same element group. Thus, transmission element 21 may transmit the ultrasonic waves sequentially for each element group. By repeating this transmission cycle during conveyance of the paper sheet 100, and detects information of the paper sheet 100 over the entire surface. In order to reduce the interference of ultrasonic waves between transmitted from the transmitting element 21 adjacent (crosstalk), as not to mutually transmit elements 21 adjacent to transmit sequentially, arrangement of the transmission element 21 (element group sorting) to, and the order of the dynamic transmission (transmission order element group) are determined.
[0039]
However, the present inventors have found that some combinations of the order of arrangement and dynamic transmission of each transmission element 21, it was found that the transmission element 21 the influence of interference from other transmitting element 21 is large there. Specifically, when transmitting a transmission element 21 that overlaps the transmission element 21 and the paper sheet 100 which does not overlap completely (1) the paper sheet 100 in this order, (2) the paper sheet 100 If it sends a transmission element 21 that do not overlap when placed to be inclined with respect to the conveying surface (3) each pair of elements 25, and, (4) between the transmission adjacent elements 21, and / or, received adjacent If there is no obstacle between the device 22, the noise in the ultrasonic signal received is found to be particularly likely to occur. Therefore, in the present embodiment adopts the following means in order to reduce the noise in these cases.
[0040]
(1) Noise caused by the transmission order
in the state in which only one of the transmission elements 21 adjacent overlaps the paper sheet 100, overlaps the transmission element 21 and the paper sheet 100 which does not overlap the paper sheet 100 If you send a transmission element 21 are in this order, interference with the transmission element 21 that overlap the transmission element 21 which does not overlap is confirmed. This transmission element 21 in each stage so that there is no dead zone is considered because it is located in close proximity to the transmitting elements 21 of the next stage. In particular, at the end of the paper sheet 100, that interfere with sending a transmission element 21 that overlaps the transmission element 21 and the paper sheet 100 which does not overlap the paper sheet 100 in this order is very large confirmed It was.
[0041]
The following describes actual interference first evaluation test results of evaluating the presence of. In a first evaluation test, the transmitting element 21 and the receiving element 22 of the 33 pairs arranged in two rows in a staggered assignment to the channel shown in FIG. 6, and the paper sheet 100 in a state shown in FIG. 6 ultra when overlapping the sonic sensor 10, and dynamically transmitted as shown in the following table 1 the transmitting element 21 of each channel for each element group. Thus, the left end of the paper sheet 100, and transmits the order ultrasound inside the transmission element 21 from the outside (see arrows in FIG. 6).
[0042]
[Table 1]

[0043]
As a result, as shown in FIG. 7, in three channels and four channels located in the left end portion of the paper sheet 100, a very large noise in the ultrasonic signal received has occurred. This ultrasonic wave transmitted from the transmitting element 21 does not overlap completely the paper sheet 100 wraps around the end of the sheet 100, corresponding to the transmission element 21 overlaps the paper sheet 100 because it was received by the receiving element 22 is considered (due to interference). On the other hand, in 5 channels transmitted in the next 3 channels overlaps the paper sheet 100, the noise did not occur.
[0044]
Therefore, in this embodiment, in particular at the end of the paper sheet 100, the transmitting element which overlaps the paper sheet 100 (first ultrasonic transmission device) 21 and does not overlap the paper sheet 100 transmitting element (second to transmit the ultrasonic wave transmitting element) 21 in this order, the order of arrangement and dynamic transmission of each transmission element 21 is determined. This can suppress the ultrasonic adverse effects flowing around the paper sheet 100 as described above, interference from the transmitting element 21 does not overlap the paper sheet 100 is reduced. Therefore, it is possible to reduce the noise of the channel located at the end of the paper sheet 100.
[0045]
In the present specification, the transmission element 21 overlaps the paper sheet 100, in this state the transmission surface 23 in plan view, as shown in FIG. 8 (a), overlaps completely sheet 100 and, as shown in FIG. 8 (b), the distance between the longitudinal edges (long sides) 100a of the sheet 100 D1 and the short side direction of the edge of the sheet 100 (short side) 100b and distance D2 are both means transmitting element 21a is the distance does not appear affected by diffraction of ultrasound. On the other hand, the transmitting element 21 does not overlap the paper sheet 100, as shown in FIG. 8 (a), in a plan view in its transmission surface 23, the transmission device 21b which is not at all overlap the paper sheet 100 means. Further, in a state in which the transmission surface 23 is viewed in plane, transmission element 21 which partially overlap the paper sheet 100 (transmitting element 21c in FIG. 8 (a)), and, in a state in which the transmission surface 23 viewed from above overlaps completely the paper sheet 100, and at least one of the distance D1 and the distance D2 is the transmission element 21 a distance out of influence of the diffraction of the ultrasonic (transmitting element 21d in to FIG. 8 (a)) in each control in the present embodiment and the embodiment 2 it is treated as transmission element 21b which does not overlap the paper sheet 100, is preferably controlled in the same manner as transmission device 21b. Therefore, in the present embodiment, at the end of the paper sheet 100, and the transmission elements 21a which overlaps the paper sheet 100, a transmission element 21c or the transmission element 21d is preferably transmitted in this order. The transmission at the end of the paper sheet 100, and the transmission elements 21a which overlaps the paper sheet 100, and the transmission element 21c or the transmission element 21d, and a transmission element 21 that does not overlap the paper sheet 100, in this order it may be. In this specification, transmission elements 21b, collectively 21c and 21d, also referred to as transmission elements 21 that do not overlap completely the paper sheet 100.
[0046]
Here, a description actually the results of a second evaluation test of evaluating the noise suppression effect. In a second evaluation test, the transmitting element 21 and the receiving element 22 of the 33 pairs arranged in two rows in a staggered assignment to the channel shown in FIG. 9, and the paper sheet 100 in a state shown in FIG. 9 super when overlapping the sonic sensor 10, and dynamically transmits the transmission element 21 of each channel in the order as indicated by the arrows in FIG. Accordingly, the left end portion of the paper sheet 100, and transmits the ultrasonic waves in order from the inner side of the outer transmission element 21 (see arrows in FIG. 9).
[0047]
As a result, as shown in FIG. 10, similarly to the 5 channels transmitted in the next 7 channels overlaps the paper sheet 100, the noise is large at the four channels and three channels positioned at the left end portion of the paper sheet 100 reduced.
[0048]
(2) Noise caused by the transmission element does not overlap the paper sheet
when the transmitted transmission element 21 that does not overlap the paper sheet 100, overlapping has not received corresponding to the transmission element 21 that overlap the transmission element 21 interference to the element 22 has been confirmed. For example, in a state in which overlap only one of the transmission elements 21 of the preceding stage or the subsequent stage with respect to the paper sheet 100 being conveyed, overlaps the transmission element 21 and the paper sheet 100 stages do not overlap the paper sheet 100 sending the transmission element 21 of the stages are in this order, interference from the transmission element 21 of the stage does not overlap the reception element 22 of the stage overlapping was confirmed. This is because the size specific circumstances, proximate each other transmit elements 21 neighboring, presumably because front and rear stages of the transmission element 21 is in proximity.
[0049]
Therefore, in this embodiment, the transmission element 21 that does not overlap the paper sheet 100, performs control not to transmit to overlap the paper sheet 100. Thus, it is possible to eliminate the diffraction of ultrasonic waves from the transmission device 21 that does not overlap the paper sheet 100 (interference source). From the same viewpoint, it is preferable to perform control not to transmit until overlaps the transmission element 21c and the transmission element 21d above the paper sheet 100. Further, while the paper sheet 100 passes through the ultrasonic sensor 10, for it is no transmission element 21 overlapping the paper sheet 100 (e.g., transmission element 21 in a position deviated from a region where the paper sheet 100 passes) it is between, it is preferable to perform control not to transmit. To realize such control, for example, as described below, in front (upstream) of the ultrasonic sensor 10, place sensors such detectable optical line sensor end of the sheet 100 (position) and, it is preferable to obtain the shape information and the passing position information of the paper sheet 100. Thus, the upper transmission element 21 of each channel can be determined whether the paper sheet 100 passes. Further, by using the shape information and the passing position information, since the timing of passing over transmission elements 21 of each stage is known, also possible to stop all transmission of the transmission element 21 of the stage it does not overlap the paper sheet 100 it is.
[0050]
Here it will be described actually the third and fourth evaluation of test results partially evaluated interference suppression effect with torn banknotes (torn ticket). In the third evaluation test, as shown in FIG. 11, or overlaps the paper sheet 100, whether do not overlap, and the respective transmission element 21 is dynamically transmitted every element group. In this case, for receiving the interference of ultrasonic waves from the transmitting element 21 does not overlap completely the paper sheet 100 (channel), as shown in FIG. 12, the change of the signal which is an original detection target (12 in , peak surrounded by an ellipse) has got buried in noise.
[0051]
Therefore, in the evaluation test of the fourth, as shown in FIG. 13, a transmission element 21 that does not overlap completely the paper sheet 100, it was controlled not to transmit to overlap the paper sheet 100. More specifically, during the transportation of the sheet 100 did not transmit the transmission device 21 not overlapping completely to the paper sheet 100 in the longitudinal direction of the paper sheet 100. Moreover, the subsequent transmission element 21, did not transmit to overlap the paper sheet 100 which has been transported. Further, after the preceding transmission element 21, no longer overlap completely in the paper sheet 100 which were being transported, did not send. By performing such control, the source of interference is turned off, the interference does not occur, as shown in FIG. 14, the noise can be effectively reduced, the original detected without being affected by noise (in FIG. 14, the peak surrounded by an ellipse) change in the signal which have been able to measure. Note that both 12 and 14 are 6-channel results shown in FIGS. 11 and 13.
[0052]
(3) Noise caused by the tilt of the element pair
in later elaborating Although the second embodiment, as shown in FIG. 15, are arranged to be inclined with respect to the conveying surface of each element pair 25. In that case, amount that each pair of elements 25 is inclined, the influence of the ultrasonic interference increases. Further, when the incident ultrasonic waves obliquely with respect to the paper sheet 100, the dynamic characteristics of the sheet 100 such transport during flutter or undulation of the paper sheet 100, i.e., variations in the conveying state of the paper sheet 100, the due to noise (hereinafter also referred to as dynamic characteristic noise.) impact is enormous of.
[0053]
Therefore, in this embodiment, as shown in FIG. 1 (a), 3 and 16, arranged so as directly facing against the conveying surface element pairs 25, perpendicular to the paper sheet 100 Ultra it is preferable to incident sound waves. Accordingly, since the interference from other transmit elements 21 is reduced, it can be taken out stably ultrasound signal. Further, it becomes less susceptible to variations in the dynamic characteristics of the paper sheet 100, it is possible to suppress the dynamic characteristic noise. Furthermore, by each pair of elements 25 and the vertical placement, it is possible to contribute to improving the accuracy and step reduction in the production.
[0054]
Here it will be described actually interference and the fifth and sixth results of the evaluation test of evaluating the inhibitory effect of dynamic characteristic noise. In the evaluation tests of the fifth, as shown in FIG. 15 was 30 ° inclined element pair 25 from the normal of the conveying surface. As a result, an output signal as shown in FIG. 17 were obtained. In contrast, in the evaluation test of the sixth, as shown in FIG. 16, it did not tilt the element pair 25 from the normal of the conveying plane (vertical arrangement). As a result, obtained the output signal as shown in FIG. 18 could be reduced as compared with the case where is tilted 30 °, the fluctuation of the output to 2/3 or less.
[0055]
Further, as shown in FIG. 19 (a), was transmitting ultrasonic waves to the paper money 101 in the range of the incident angle 0 ° ~ 45 °, as shown in FIG. 19 (b), the incident angle of the ultrasonic wave with respect to the bill 101 the larger the fluctuation of output is increased. For example, when the incident angle is changed from 0 ° to 10 °, although variations in the output was increased by about 5% when the incident angle is changed to 40 ° from 30 °, the fluctuation of the output was increased about 25%. Change of the incident angle with respect to the bill 101 despite the same 10 °, the amount of increase in the fluctuation of the output was 5 times approximately. Therefore, from the inclination of each pair of elements 25 and 30 °, the inclination of each pair of elements 25 is the mutual 0 ° (vertical), the variation of the incident angle of the ultrasonic against the paper sheet 100, i.e. the sheet 100 variation in dynamic characteristics, can reduce variations in output due to, it is possible to take out the output signal more stably.
[0056]
In the case where the vertical arrangement of each element pair 25, as described above, multiple reflection of the ultrasonic wave between the respective transmission element 21 and the paper sheet 100 is concerned, for which, for each receiving element 22 it is possible to cope by limiting the reception. Specifically, it occurs between the sheet 100 and the transmission element 21, the multiple reflection component of the ultrasonic wave received by the receiving element 22 later than the transmission signal of the normal, the fatigue of the paper sheet 100 it suffices to not used as an ultrasonic signal for detecting.
[0057]
In view of avoiding multiple reflections, but it is preferable for the inclined arrangement of the second embodiment to be described later, as described above, reduction of the dynamic characteristic noise, stabilizing the output signal, and, in view of advantages in production from the direction of the vertical arrangement of the present embodiment is preferred. For vertical arrangement, (the inclination angle of the transmission face 23 or receiving surface 24 of the elements 21, 22 against or conveying surface) angle of inclination of the central axis of each element 21, 22 with respect to the perpendicular of the conveying surface is substantially 0 ° it is preferable that.
[0058]
(4) Noise countermeasures between adjacent elements
for detecting information of a dead zone, without the paper sheet 100, the gap between adjacent element pairs 25 is set to be small. Therefore, ultrasonic waves transmitted from another set of the transmission element 21 (in particular fully to what does not overlap the paper sheet 100), the receiving device 22 side corresponding to the transmission element 21 overlaps the paper sheet 100 Guests wraps around to the interference caused by the ultrasonic wave is sometimes or generated. In that case, it is received as noise, do not detect the information of the paper sheet 100, or becomes a factor causing a decrease in the detection accuracy.
[0059]
Therefore, in this embodiment, as shown in FIGS. 2, 3 and 20, it is provided with a shielding wall 41 between the transmission adjacent element 21, a shielding wall 42 between the reception elements 22 adjacent provided . Thus, (which does not overlap completely, especially paper sheet 100) another set of transmission elements 21 wraparound ultrasonic wave transmitted, and can suppress the interference due to ultrasonic. As a result, it is possible to measure the original signal from which the noise is reduced.
[0060]
Shielding wall 41 is formed so as to fill the gaps between the transmission adjacent element 21. Also, the shielding wall 41, as shown in FIG. 3, the transmitting device 21 side, several mm from the transmitting surface 23 of the transmission element 21, is formed so as to overlap the transmission element 21, in the conveying path, the conveying of the housing 13 It is formed to the opposite portion opposed to the surface. Likewise, the shielding wall 42 is formed so as to fill the gap between the receiving neighboring element 22. Also, the shielding wall 42, as shown in FIG. 3, the receiving device 22 side, several mm from the receiving surface 24 of the receiving element 22, are formed so as to overlap the receiving elements 22, the conveying path, the conveying of the housing 14 It is formed to the opposite portion opposed to the surface. Thus, it is reduced as much as possible the generation of unnecessary interference and echo. Moreover, the shielding walls 41 and 42, respectively, are formed integrally with the housing 13 and 14.
[0061]
Incidentally, the shielding wall 42 of the shielding wall 41 and the receiver 12 of the transmitter 11 may be only one is provided, but from the viewpoint of reducing noise effectively, a shielding wall 42 for at least the receiving unit 12 it is preferable to provide. Further, in FIGS. 2, 3 and 20, with the shield wall 41 between all the adjacent transmit elements 21 is provided, although the shielding wall 42 all between the receiving element 22 adjacent arranged, a part of the adjacent it may be provided a shielding wall 41 only between the transmission element 21, or may be provided with a shielding wall 42 only in a part between the adjacent receiving elements 22. For example, shielding wall 41 may be one extending in the Y-axis direction is provided only between the transmitting element 21 of the different stages, the shielding wall 42 is provided only between the receiving element 22 of the different stages and it may be configured to extend in the Y-axis direction.
[0062]
Next, a sheet-state detecting device and a paper sheet state detecting method according to the present embodiment in detail. Sheet state detection device according to this embodiment, transmits ultrasonic waves to the paper sheet 100 being conveyed, based on the ultrasound output signal transmitted through the paper sheet 100, the state of the paper sheet 100 , specifically to detect fatigue. Is applicable technology regardless of the type of the paper sheet.
[0063]
This embodiment, the fatigue of the paper sheet 100, tear e.g., torn, wrinkled, on the basis of the ultrasonic signal using the ultrasonic signals transmitted through the sheet 100 is changed, obtained by such accordance paper detecting fatigue sheet 100, it is to determine the fitness of the paper sheet 100.
[0064]
Sheet state detecting device 50 according to the present embodiment, as shown in FIG. 21, and can be placed hopper 51 a plurality of paper sheets 100, conveys the paper sheet 100 placed on the hopper 51 a conveyance path 52, the ultrasonic sensor 10 for information detection of the paper sheet 100, the integrated unit 53 for stacking the paper sheet 100 is determined based on the detected information by the ultrasonic sensor 10, determines non paper the paper sheet 100 to satisfy the kind 100 and the predetermined condition and a reject unit 54 for stacking separately with other sheet 100. By utilizing a built-in ultrasonic sensor 10 in such a paper sheet state detecting device 50, a plurality of paper sheets 100 placed on the hopper 51, one by one, to be processed sequentially it can. Then, for example, a sheet 100 it is determined that the unfit are returned to the reject unit 54.
[0065]
Sheet state detecting device 50, as shown in FIG. 21 (b) and 22, in accordance with the identification processing of the paper sheet 100 to be processed, the sensor unit including a variety of sensors other than ultrasonic sensors 10 equipped with a 60. The sensor unit 60 is disposed in front (upstream) of the ultrasonic sensor 10, the sensor unit 60, for example, a timing sensor 61a and 61b, the infrared light, a plurality of types of light such as visible light irradiation measuring the optical properties of the paper sheet 100 Te, the optical line sensor 62 for acquiring an optical image information of the paper sheet 100, the thickness sensor 63 for measuring the thickness of the paper sheet 100, the paper sheet a magnetic sensor 64 for measuring the magnetic properties of the class 100 is irradiated with ultraviolet light and a fluorescent sensor 65 which measures the fluorescent ink portion of the sheet 100. Further, the sensor unit 60, in a so sheet 100 can move the conveying path 52, and a plurality of rollers 55b are provided as the transport unit 55, the roller 55b is driven by a drive device (not shown) such as a motor that.
[0066]
Timing sensor 61a detects the sheet 100 coming sequentially carried into the sensor unit 60, and generates a bill detection signal for determining the timing to start the measurement of the sheet 100 in the sensor unit 60. On the other hand, the timing sensor 61b detects the paper sheet 100 sequentially carried out of the sensor unit 60, generates a sheet detection signal to determine the timing of the measurement end of the paper sheet 100 in the sensor unit 60. The timing sensor 61a and 61b, typically, the light reflective or light transmissive type optical sensor is used, may be provided a sensor for detecting the passage of mechanical paper sheet 100.
[0067]
In sheet state detection device 50, based on the information acquired by the sensor unit 60, the denomination identification and authenticity discriminating the paper sheet 100, determines the direction and the front and back of the paper sheet 100, the outer shape of the paper sheet 100 the acquisition of information and the passing position information. Thus, the paper sheet state detection device 50 of this embodiment is that also functions as a paper sheet recognition apparatus. Further, the sheet-state detecting device 50, based on the information obtained by the sensor unit 60, treatment with the ultrasonic sensor 10, in particular the determination of the fitness of the paper sheet 100 is performed. Note that the sensor unit 60, detailed description thereof is omitted because it is utilized by techniques which are conventional in the field of banknote handling apparatus.
[0068]
Sheet state detection device 50, in addition to the configuration shown in FIGS. 21 and 22, as shown in FIG. 23, (hereinafter referred to "communication I / F") communication interface 56, control unit 70 and memory and a section 80. Control unit 70 includes a detector 71 for detecting the state of the paper sheet 100 on the basis of the ultrasonic signal received by the ultrasonic sensor 10, acquires an ultrasonic signal or other sensors that are received by the ultrasonic sensor 10 based on the signal, control identification or authenticity of such type of the paper sheet 100, a determination unit 72 for determining such positive loss, a transmission control unit 73 for controlling each transmission element 21, the respective receiving elements 22 a reception control unit 74, a sensor control unit 75 for controlling the sensors of the sensor unit 60, a sensor information acquiring unit 76 for acquiring information of each sensor of the sensor unit 60, the roller 55a for conveying the paper sheet 100 , and a conveyance control unit 77 that controls the transport unit 55 and 55b and the like. Storage unit 80 includes a variety of templates (e.g., reference image data, etc.) 81 which is utilized to perform the determination processing of the information obtained in the sensor unit 60, identification and authenticity of such type of the paper sheet 100, positive stores and various threshold 82 as a reference for determining the loss or the like.
[0069]
Determining unit 72 includes the information obtained by the sensor information acquisition unit 76, by comparing the template 81 corresponding to the information, the function of identifying the type of the paper sheet 100 or the like.
[0070]
Specifically, for example, if the processing target is the United States paper currency, previously $ 1 in the storage unit 80 $ 2 $ 5 $ 10 $ 20 $ 50 and 100 U.S. dollars each note of the reference image data is stored as a template 81. Then, the data of the characteristic portion of the image on the paper sheet 100 imaged by the line sensor 62 is compared with the reference image data. As a result, data of the characteristic portion of the image of the paper sheet 100 is different from the other denominations of the reference image data coincident with $ 100 bills of the reference image data, the paper sheet 100 at 100 dollar bill and it determines that there is. When the paper sheet 100 to be processed is a bill, the determination unit 72, whether or not in addition to performing such a denomination identification, based on the information acquired by the sensor unit 60, the bill is genuine or authenticity discrimination and determines bill processing is performed by fitness determination such determines whether a banknote reusable satisfies a predetermined criterion. Based on the information acquired by the sensor unit 60, the identification process of such a paper sheet 100 are the techniques that are conventionally used in the field of the paper sheet recognition apparatus, a detailed description thereof will be omitted.
[0071]
The determination unit 72 has a function of performing soil detection based on ultrasound signals obtained by the ultrasonic sensor 10. By utilizing the fact that the ultrasonic signal transmitted through the paper sheet 100 by the state of the paper sheet 100 is changed, but is intended to determine the fitness of the paper sheet 100, which will be described in detail later.
[0072]
Transmission control unit 73 and the reception control unit 74, respectively, has a function of controlling the transmission and reception of the transmission element 21 and the receiving element 22. To obtain a separate ultrasonic signal by each element pair 25, the transmission control unit 73 performs transmission control for transmitting each element groups in the order, the reception control unit 74, according to the timing of transmission of each transmission element 21 Te, and it controls the timing of the reception of the receiving device 22 corresponding to the transmission element 21. The transmission control unit 73 and the reception control unit 74, in order to reduce the noise of the received signal, performs the control described in the above (1) to (3).
[0073]
Storage unit 80 is constituted by a storage device such as a volatile or nonvolatile memory or a hard disk, it is used to store various types of data necessary for processing performed by the sheet-state detecting device 50.
[0074]
Communication I / F 56 has a function of transmitting and receiving a signal from the outside of the sheet-state detecting device 50, a signal from a sheet state detection device 50 to the outside. By the communication I / F 56, for example, carried out by receiving a signal from the outside to change the operation setting of the control unit 70, update software programs and data stored in the storage unit 80, the addition and deletion processing or can output the judgment result of the paper sheet 100 by the sheet-state detecting device 50 to the outside.
[0075]
The control unit 70 includes, for example, a software program for realizing various processes, a CPU for executing the software program is configured by various hardware or the like to be controlled by the CPU. The storage of software programs and data necessary for operation of each unit, and the storage unit 80, a memory or a hard disk of a RAM and a ROM or the like provided in a dedicated are utilized separately.
[0076]
Next, a description by the sheet-state detecting device 50 for processing to determine the fitness of the paper sheet 100.
[0077]
First, when the paper sheet 100 in the sheet state detection device 50 by the timing sensor 61a is detected that the arrival, with the sensing of each sensor of the sensor unit 60 is started, the sensor according to the sensor information acquisition unit 76 the acquisition of the information is started. The information acquired by the sensor information obtaining unit 76 includes shape information and the passing position information of the paper sheet 100 by the optical line sensor 62. Incidentally, the sheet-state detecting device 50, while not detect the paper sheet 100 is in a state of monitoring the arrival of the paper sheet 100.
[0078]
Then, the determination unit 72, the information obtained by the sensor information obtaining unit 76, by comparing the template 81 corresponding to the information, identifying the type of the paper sheet 100 (denomination in the case of banknotes), authenticity discrimination of the paper sheet 100, fitness determination of the paper sheet 100, the arrangement, the orientation and the front and back of the determination of the paper sheet 100 performs.
[0079]
Next, with reference to the flowchart of FIG. 24, a description will be given of a process for determining the fitness of the paper sheet 100 by using an ultrasonic sensor 10.
[0080]
First, the transmission control unit 73 receives the transport information of the paper sheet 100 (shape information and the passing position information) from the sensor information acquisition unit 76 (step S10).
[0081]
Then, the transmission control unit 73, based on the received conveyance information of the paper sheet 100, calculates a transmission pattern of the transmission element 21 for performing the control described in the above (1) to (3) (step S11 ).
[0082]
Then, the transmission control unit 73 and the reception control unit 74, respectively, based on the transmission pattern, driving the transmitting device 21 and receiving device 22 (step S12). Thus, based on the transmission pattern, with an ultrasonic wave is transmitted from each transmitting element 21, the ultrasonic waves passing through the paper sheet 100 is transmitted from each receiving element 22 is received by the corresponding transmission element 21 that. However, the reception control unit 74, as described above, the ultrasonic components are multiply reflected between the sheet 100 and the transmission element 21 (multiple reflection component), for detecting fatigue of the paper sheet 100 control without the ultrasonic signal (hereinafter, also referred to as multiple reflection cut control.) is performed. The multiple reflection component is received later than normal transmission signal (transmission component of the ultrasonic wave received first by the receiving element 22 is transmitted through the paper sheet 100).
[0083]
Next, an ultrasonic signal processing received by the receiving element 22 in the sensor mounting board 32 and the amplifier board 33, specifically, the processing of the amplification process and the like is performed, the ultrasonic transmission amount of the paper sheet 100 over the entire surface It is calculated (step S13).
[0084]
Next, the detection unit 71 detects the fatigue of the paper sheet 100 on the basis of the ultrasonic transmission amount measured by the sheet 100 over the entire surface (step S14). Specifically, first, the detection unit 71 calculates the entire or a certain range of the paper sheet 100, the average value of the ultrasonic transmission for the deviation, or deviation / average (which deviation divided by average) to.
[0085]
Here, actually using a non-contact-air propagation ultrasonic inspection system NAUT21 (manufactured by Japan Probe Inc.), China of 100 yuan bill of the degree of fatigue of the issue in 2005 is a bill that is a material of plant fibers (dripping degree) It will be described for the experimental results were evaluated by ultrasound. Note that the dripping degree is an index showing the degree of accordance of the sheet, wherein, as shown in FIG. 25, one end portion in the longitudinal direction is 100 yuan banknotes 102 supported by the support member 111 It was determined based on the distance L between the other longitudinal end and the support member 111. L evaluates the case of more than 91mm and the "new bills level", L is more than 71mm, the case of less than 91mm was evaluated as "fatigue small", L is 51mm or more, and evaluation in the case of less than 71mm that "there is fatigue" and, L is 31mm or more, in the case of less than 51mm was evaluated as "fatigue strength", L and rated the case of less than 31mm as "unfit equivalent".
[0086]
The results of this experiment, the bill of fatigue (sauce degree) has been found to appear as a singular point of local data. When the fatigue progresses, rather than a change in overall permeation amount, the number of the singular point went increasing. On the other hand, also progressed fatigue, since the portion where the transmission amount is reduced as the portion which becomes larger coexist, the average value hardly changed. This is because the transmission amount increases in site fibers bill is scraped thin, presumably because the amount of permeation is decreased at the site of fiber thickened fluffed. The ultrasonic transmission weight measured is not uniform across the banknote, the thread, in the site where the watermark or the like is provided, were locally variation similar to the singularity due to fatigue. Therefore, the site where the thread or the like is provided, and variation bill is inherent, it is difficult to distinguish between fluctuations due to fatigue from only a specific value by ultrasound. From the above, the paper sheet 100, in particular the fatigue although a material of plant fibers from the viewpoint of measuring ultrasonically determining unit 72, the physical properties of the paper sheet 100, among them the physical properties stable uniform in range and is not an average value, deviation, or, it is preferable to calculate the deviation / mean. Site physical properties of the paper sheet 100 as a uniform and are stable range, for example, that only the base of the paper sheet 100 is only printed on the substrate region and the paper sheet 100 provided has been subjected ( printing sites) is preferred.
[0087]
Also, in general, output is obtained in the ultrasonic measurement is small, it is difficult to distinguish the original signal and noise. Table 2 below shows a sample of the noise amount and the measurement data of the measurement environment in the above experiment.
[0088]
[Table 2]

[0089]
As shown in Table 2, the deviation of officially sealed tickets dripping degree new bills level, offset (noise equivalent) 1.6 times only without deviation, is approximately 62% of the deviation and the measurement value of Kanfuken it is believed that noise is accounted for. The size of the noise is highly dependent on the measurement environment, ultrasound on a specific ultrasonic measurement becomes very small measurement, SN characteristic tends to become a problem. Therefore, noise in the increase or decrease, likely a problem that may be directly connected to the erroneous determination. Therefore, the noise reduction means in this embodiment described above can be said to be very important for improving the accuracy of the fitness determination of the paper sheet 100.
[0090]
Hereinafter, Continuing with the process of soil detection in the sheet 100.
After fatigue detection of the paper sheet 100 by the detection unit 71, determination unit 72 compares the value calculated by the detecting section 71, and a threshold 82 stored in the storage unit 80, this calculated value is the threshold It determines greater or not (step S15). Then, if the calculated value is smaller than the threshold value (step S15; No abnormality), not the paper sheet 100 in unfit (genuine), i.e. determines that no abnormality, performs the normal processing (step S16), and the process is terminated. On the other hand, if the calculated value is equal to or greater than the threshold (Step S15; Yes abnormality), the determining unit 72 determines that there is a paper sheet 100 abnormality, determination of fitness based on the information acquired by the other sensors performing matching determination result (step S17). The matching determination confirms the result (no abnormality or abnormal) of soil detection by other sensors. As a result of the matching determination, if there is no abnormality, the determination unit 72 determines that not the unfit the paper sheet 100 (genuine) (step S18; No abnormality), performs the normal processing (step S16) , the process is terminated. On the other hand, the result of the matching determination, if there is abnormal, the determination unit 72 determines the paper sheet 100 and unfit note (Step S18; Yes abnormal), return the sheet 100 to the reject unit 54 performs reject process (step S19), and ends the process.
[0091]
(Embodiment 2)
In the present embodiment, the contents mainly describes features specific to the present embodiment, overlapping the first embodiment will be omitted. Further, in the present embodiment the first embodiment Tokyo, members having the same or similar functions are denoted by the same reference numerals, in the present embodiment, description of the member is omitted. This embodiment, except for the points described below are substantially the same as the first embodiment.
[0092]
In the present embodiment, as shown in FIGS. 26 and 27, the ultrasonic transmitting element 21 is mounted on the sensor mounting board 31 for each stage, each sensor mounting board 31 is disposed between the sensor mounting board 31 connected to the substrate holder 34, it is supported. Similarly, the ultrasonic receiving elements 32 is mounted on the sensor mounting board 32 for each stage, each sensor mounting board 32 is connected to the substrate holder 35 disposed between the sensor mounting board 32 is supported .
[0093]
In the present embodiment, each element pair 25 are arranged in a state inclined with respect to the conveying surface. Thus, as compared with the case of the vertical arrangement of the first embodiment, to effectively avoid multiple reflections of ultrasonic waves generated between each transmission element 21 and the sheet 100. The inclination angle of the center axis of the elements 21, 22 with respect to the perpendicular of the conveying surface (or the inclination angle of the transmission face 23 or receiving surface 24 of the elements 21 and 22 against the conveying surface) is not particularly limited, it can be set appropriately , for example, 30 °.
[0094]
In this embodiment, similarly to Embodiment 1, for detecting information of a dead zone, without the paper sheet 100, the gap between adjacent element pairs 25 is set to be small. Further, because of such dimensions specific circumstances, element pair 25 of each stage are in close proximity to the element pair 25 of adjacent stages. Moreover, ultrasound, when attenuated to approximately 1/100 example when passing through the paper sheet 100, about 100 times that of the signal difference between the stages does not overlap with the stage overlaps the paper sheet 100 ( the output difference). Therefore, only the transmission element 21 of any of the stages overlaps the paper sheet 100, and the ultrasonic wave transmitted from the transmitting device 21 of the stage does not overlap the paper sheet 100, overlaps the paper sheet 100 and Guests wraps around to the receiving device 22 side corresponding to the transmission element 21 of the stage a little and, if interference due to ultrasonic occurs even slightly, they are received as noise, detection information of the paper sheet 100 or it can not be, or become a factor causing a decrease in the detection accuracy. Transmission element 21 of one or more stages on the upstream side overlaps the paper sheet 100, if one or more stages of the transmission element 21 on the downstream side do not overlap completely in the paper sheet 100, or vice versa in the case, this phenomenon can occur.
[0095]
Therefore, in this embodiment, the shielding wall 43 between the reception elements 22 of adjacent stages are provided. Thus, complete wraparound ultrasonic wave transmitting element 21 has transmitted the stage does not overlap the the paper sheet 100, and can suppress the interference due to ultrasonic. That is, it is possible to receive elements 22 corresponding to the transmission element 21 of stage overlaps the paper sheet 100 is less likely affected by the transmission element 21 of the stage does not overlap completely the paper sheet 100. As a result, the stage of the element pair 25 overlaps the paper sheet 100, it is possible to measure the original signal from which the noise is reduced.
[0096]
The shielding wall 43 is formed in a plate shape, in the conveying path is formed to the opposite part which faces the conveying surface of the housing 14. Shielding wall 43 may be formed integrally with the substrate holder 35, the housing 14 and may be integrally formed.
[0097]
The following describes actual interference seventh and results of the evaluation test of the eighth of the measurement of the presence or absence of. The evaluation test of the seventh and eighth, assigned the transmission element 21 and the receiving element 22 of the 31 pairs arranged in two rows in a staggered manner to the channel shown in FIGS. 29 and 30. The evaluation test of the seventh, as shown in FIGS. 28 and 29 were not provided a shielding wall in front between the rear stage of the receiving element 22. As a result, as shown in FIG. 31, noise is generated in the upstream and downstream channels. In front of the channel, the ultrasonic interference (reverberation from the transmission device 21 of the subsequent channels transmitted immediately before transmission of the transmission element 21 of the channel (transmission element 21 that does not overlap completely the paper sheet 100) ) it is considered the a. Further, in the subsequent channel, ultrasonic wave from the transmitting element 21 of the preceding channel that is transmitted after the transmission of the transmission element 21 of the channel (transmission element 21 that does not overlap completely the paper sheet 100) is wrapped around It is considered that it was Idei.
[0098]
In contrast, in the evaluation test of the eighth, as shown in FIG. 30, the shield wall 43 is provided in front between the rear stage of the receiving element 22. As a result, as shown in FIG. 32, the noise is hardly generated in the previous stage of the channel (the same channel as the previous stage of the channel of FIG. 31) and subsequent channel (the same channel as the downstream channel of FIG. 31). This is accomplished by providing the shielding wall 43, presumably because interference between front and rear stages is prevented.
[0099]
In the present embodiment, may be the same shielding wall also between the transmission element 21 of the adjacent stages provided thereby, potentially resulting in more noise reduction effect by the arrangement of the elements 21, 22 is there. The shield wall of the transmission portion 11 may be provided in place of the shielding wall 43, but from the viewpoint of reducing noise effectively, it is preferable to provide a shield wall 43 of at least the receiving unit 12. Further, as shown in the embodiment 1, in each stage, it may be provided a shielding wall between adjacent elements 21 or 22.
[0100]
Also in this embodiment, similarly to Embodiment 1, it is possible to determine the fitness of the paper sheet 100 by using an ultrasonic sensor 10. However, in the present embodiment, the reception control unit 74 may not perform the multiple reflection cut control described in the first embodiment.
[0101]
As described above, the sheet-state detecting device 50 according to the embodiment includes an ultrasonic transmitting element 21, the ultrasonic receiving elements 22, a transmission control unit 73 for controlling the timing of transmission of the ultrasonic transmitting element 21 , based on the ultrasonic signals received by the ultrasonic receiving elements 22, since it and a detector 71 for detecting the state of the paper sheet 100, can reduce the noise in the ultrasonic signal received, as a result, the paper sheet it is possible to detect the state of the class 100 with high accuracy.
[0102]
Further, the paper sheet state detecting device 50 according to the above embodiment, the ultrasonic transmitting element 21 and the ultrasound receiving element 22 at least 2 Kumisonae, transmission control unit 73, the transmission of the at least two ultrasound transmitting element 21 since controlling the timing independently of each other, it is possible to detect the state of the paper sheet 100 with higher accuracy.
[0103]
Further, in the ultrasonic each set of transmission elements 21 and the ultrasonic receiver element 22, the ultrasonic transmitting element 21 is disposed opposite to the ultrasonic receiving elements 22, the sheet-state detecting device according to the embodiment 50, between at least one pair of ultrasonic transmitting elements 21 and the ultrasonic receiver element 22, further comprising a conveying unit 55 for conveying the paper sheet 100, the transmission control unit 73 does not overlap the paper sheet 100 since controlling the timing of transmission of the ultrasonic transmitting element 21, the noise in the ultrasonic signal received can be effectively reduced, it is possible to detect more accurate status of the paper sheet 100.
[0104]
In the above embodiment, the transmission control unit 73 includes a first ultrasonic transmission element 21 which overlaps the paper sheet 100, a second ultrasonic transmitting element 21 does not overlap the paper sheet 100, in this order since performs control to transmit, the noise can be particularly effectively reduced in ultrasound signal received, it is possible to detect the state of the paper sheet 100, especially high precision.
[0105]
In the above embodiment, the first ultrasonic transmitting element 21 and the second ultrasonic transmission element 21 is arranged adjacent the first ultrasonic transmission element 21 is overlapped on the end portion of the paper sheet 100 since that, the noise of the channel located at the end of the paper sheet 100 can particularly effectively reduced.
[0106]
In the above embodiment, the transmission control unit 73, the ultrasonic transmitting element 21 does not overlap the paper sheet 100, since performing control not to transmit to overlap the paper sheet 100, the noise in the ultrasonic signal received the can particularly effectively reduced, it is possible to detect the state of the paper sheet 100, especially high precision.
[0107]
Further, the paper sheet state detecting device 50 according to the above embodiment, further comprising an optical line sensor 62 to acquire the optical image information of the paper sheet 100, the transmission control unit 73, which is acquired by the optical line sensor 62 based on the optical image information sheet 100 can be controlled since it controls the timing of transmission of the at least two ultrasound transmitting element 21, the timing of the transmission of the at least two ultrasound transmitting element 21 with high precision, as a result It can further reduce noise in the ultrasonic signal received.
[0108]
In the above embodiment, the ultrasonic transmitting element 21 and the ultrasound receiving element 22, since it is arranged so as directly faces the conveying surface of the paper sheet 100, it can be taken out stably ultrasonic signal In addition, it is possible to suppress the dynamic characteristic noise.
[0109]
Further, the paper sheet state detecting device 50 according to the above embodiment, the ultrasonic wave multiply reflected that the paper sheet 100 located between the ultrasonic transmitting element 21 and the ultrasonic receiving element 22 and the ultrasonic transmitting element 21 components from further comprising a reception controller 74 for controlling not used as the ultrasonic signal, it is possible to effectively suppress the generation of noise due to multiple reflection of the ultrasonic wave.
[0110]
In the above embodiment has been soil detection of a sheet 100 on the basis of the information acquired by the information and other sensors acquired by the ultrasonic sensor 10, which is acquired by the ultrasonic sensor 10 from information only may be subjected to a fitness determination of the paper sheet 100.
[0111]
In the above embodiment, a case has been described for detecting fatigue as the state of the paper sheet 100, the state of the paper sheet 100 to be detected is not particularly limited, for example, double feeding of the paper sheet 100, it may be the presence or absence of the paper sheet 100 and the like.
[0112]
Having described the embodiments of the present invention with reference to the accompanying drawings, the present invention is not limited to the above embodiment. The configuration of each of the embodiments may be appropriately combined without departing from the scope of the present invention may be modified.
Industrial Applicability
[0113]
As described above, the present invention is a useful technique to determine accurately the positive loss of the sheet.
DESCRIPTION OF SYMBOLS
[0114]
10: ultrasonic sensor (ultrasonic sensor
unit) 11: transmission unit
12: receiving unit
13, 14: casing
15-18: opening
21, 21a ~ 21d: ultrasonic transmitting element
22: ultrasonic receiving element
23: transmission surface
24 : receiving surface
25: element pair
31, 32: sensor mounting board
33: amplifier board
35: substrate holder
41-43: shielding wall
50: sheet-state detecting device
51: hopper
52: conveyance path
53: stacking unit
54 : reject unit
55: conveyance section
55a, 55b: roller
56: communication interface
60: the sensor unit
61a, 61b: timing sensor
62: line sensor
63: thickness sensor
64: magnetic sensor
65: fluorosensor
70: control unit
71: detection unit
72: determination unit
73: transmission controller
74: reception control unit
75: sensor control unit
76: the sensor information acquisition unit
77: the conveyance control unit
80: storage unit
81: Template
82: threshold
100: sheet
100a : longitudinal edges of the sheet (long
side) 100b: lateral direction of the edge of the sheet (short
side) 101: bill
102: 100 yuan bill
111: supporting member

WE CLAIM

The paper sheet state detection device for detecting the state of the paper sheet while conveying the paper sheet to be detected,
and the ultrasonic transmitting element,
and the ultrasonic receiver element,
the transmission of the ultrasonic transmitting element a transmission control section for controlling the timing,
based on said ultrasonic signal received by the ultrasonic receiving elements, a detecting section for detecting the state of the paper sheet
sheet-state detecting device comprising a.
[Requested item 2]
The paper sheet state detection device, the ultrasonic transmitting element and the ultrasonic wave receiving element at least 2 Kumisonae,
the transmission control unit controls the timing of transmission of the at least two ultrasound transmitting element independently of each other sheet state detecting apparatus according to claim 1.
[Requested item 3]
In each set of the ultrasound transmitting element and the ultrasonic receiver element, the ultrasonic transmitting element, said being disposed opposite to the ultrasonic receiving device,
the paper sheet state detecting device includes at least one pair of between the ultrasonic transmitting elements and ultrasonic receiving elements, further comprising a conveying unit to convey the paper sheet,
the transmission control unit controls the timing of transmission of the ultrasonic wave transmitting element does not overlap the paper sheet sheet state detecting device according to claim 2 wherein.
[Requested item 4]
The transmission control unit has a first ultrasonic wave transmitting element overlaps with the paper sheet, and a second ultrasonic transmission element does not overlap the paper sheet, according to claim 3 for controlling to transmit in this order of the paper sheet state detection device.
[Requested item 5]
The first ultrasonic transmission element and the second said ultrasonic transmitting elements are arranged adjacently,
the first ultrasonic transmission device, according to claim 4, wherein overlaps the end portion of the paper sheet of the paper sheet state detection device.
[Requested item 6]
The transmission control unit, the ultrasonic wave transmitting element does not overlap the paper sheet, the paper sheet condition detection apparatus according to any one of claims 3-5 for controlling not to transmit to overlap the paper sheet .
[Requested item 7]
The paper sheet state detecting apparatus further comprises an optical line sensor for obtaining an optical image information of the paper sheet,
the transmission control unit, the optical image information of the paper sheet obtained by the optical line sensor based on the paper sheet condition detection apparatus according to any one of claims 2 to 6 for controlling the timing of transmission of the at least two ultrasound transmitting element.
[Requested item 8]
The ultrasonic transmission device and the ultrasonic receiving device, a sheet-state detecting device according to any one of claims 1 to 7 arranged to directly face the conveying surface of the paper sheet.
[Requested item 9]
The reception control unit the ultrasound component that is multiply reflected between the paper sheet wherein the ultrasonic wave transmitting element located performing the control is not used as an ultrasonic signal between the ultrasonic transmission device and the ultrasonic receiving element further comprising a sheet state detecting apparatus according to claim 8.
[Requested item 10]
The paper sheet state detection device, the ultrasonic transmission device and the ultrasonic receiving element at least 2 Kumisonae and a shielding wall between the ultrasonic wave transmitting element adjacent, adjacent ultrasonic receiving element sheet state detection device according to any one of claims 1 to 9, further comprising at least one of the provided shielding wall between.
[Requested item 11]
The paper sheet is a paper sheet state detection device according to any one of claims 1 to 10 which is a banknote.
[Requested item 12]
Wherein the detection unit includes a sheet state detection device according to any one of claims 1 to 11 for detecting fatigue of the paper sheet.
[Requested item 13]
The paper sheet state detecting method for detecting the state of the paper sheet while conveying the paper sheet to be detected,
and a transmission control step of controlling the timing of transmission of the ultrasonic wave transmitting element,
the ultrasonic receiving elements in on the basis of the received ultrasonic signal, a detection step of detecting a state of the paper sheet
sheet state detecting method comprising the.
[Requested item 14]
Wherein in the transmission control step, at least two pairs of ultrasonic transmitting elements and ultrasonic receiving elements are controlled independently of each other the timing of transmission of the at least two ultrasound transmitting element constituting claim 13, wherein the sheet state detection Method.