DESC:FIELD OF INVENTION
The present invention relates generally to a sensing device, particularly to a holder for retaining the sensing device in axial sensor, which is used to sense the rotational speed, position and direction of ferromagnetic wheel, said sensing device comprises sensing element and magnet for axial sensing. More particularly, the holder of the present invention maintains required gap between the magnet and sensing element and parallelism of the sensing element to the target to be sensed.

BACKGROUND ART
Generally, sensor for sensing rotational speed or position or direction of the ferromagnetic wheel and sensing element is being used for the application. The output of the sensing element is fed to display unit or to Electronic Control Unit (ECU) to process further to control some other applications. The sensing element and one or more back biased magnets are to be positioned in different angles and positions based on the end application in any part of the vehicle such as transmission, crank shafts or cam shafts etc.

Since the sensing element has flimsy terminals, it cannot hold the magnet with minimum gap and parallelism with sensing target during and after the automated assembly of the sensing element due to the size of the magnet. Hence, there is a need for extra arrangement to hold the magnet and sensing element on Printed Circuit Board (PCB).

JP2006308435 discloses a moving object detection device has a magnetic sensor element, a permanent magnet for applying a magnetic field to the magnetic sensor element; a board on which electronic parts are mounted, a holder; and a case. The holder has an integral approximately box-shaped support part to hold the magnet and the board, and the holder is inserted into the case so that the magnetic sensor element, the permanent magnet, and the board are contained in the case.

US7459905 discloses a rotation detector comprising: a holder, made of a non-magnetic material, having a holder body and an extending portion extending from the holder body, the extending portion being disposed in a hollow space in a magnet, and a sensor unit being mounted on the extending portion.

Accordingly, there exists a need for a holder for retaining a sensing element with magnet, which maintains required gap between the magnet and sensing element; maintains said sensing element and magnet in required angle for sensing device construction and maintains parallelism of the sensing element to the target to be sensed.

OBJECTS OF INVENTION
One or more of the problems of the conventional prior art may be overcome by various embodiments of the present invention.

It is the primary objective of the present invention to provide a holder for retaining a sensing device in axial sensor, which is used to sense the rotational speed, position and direction of ferromagnetic wheel, said sensing device comprises sensing element and magnet.

It is another object of the present invention to provide a holder for retaining a sensing device, which maintains required gap between the magnet and sensing element and maintains said sensing element and magnet in required angle of the sensing device.

SUMMARY OF INVENTION
Thus according to the basic aspect of the present invention there is provided a holder for retaining a sensing device, said sensing device comprising of sensing element; and magnet for axial sensing,
wherein the sensing element and magnet accommodated within the holder are separated by pre-determined gap,
wherein said pre-determined gap renders the sensing element position in parallel to the target to be sensed in required angle with help of the holder, and
wherein the magnet is positioned behind the sensing element for back biasing the sensing element in axial sensing application.

It is another aspect of the present invention, wherein the sensing element and magnet are accommodated within the holder by snap lock.

It is another aspect of the present invention, wherein the sensing element with one or more electrical terminals is soldered with Printed Circuit Board (PCB), thereby retains the sensing element and magnet within the holder.
It is another aspect of the present invention, wherein perpendicularity of the sensing element on the PCB is maintained with the help of the holder.

It is another aspect of the present invention, wherein angular positioning of the sensing element and magnet is based on fitment of sensor/sensor element.

It is another aspect of the present invention, wherein the holder assembled on the PCB is accommodated into sensor housing with connector, said connector is fixed to the assembled PCB.

It is another aspect of the present invention, wherein output from the connector is fed to display unit or to an Electronic Control Unit (ECU) to process further to display or to control output from the sensing element with magnet.

BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1: illustrates holder for retaining a sensing device in axial sensor according to the present invention.
Figure 2: illustrates the holder with sensing element and magnet according to the present invention.
Figure 3: illustrates the holder in assembled PCB with sensing element and magnet according to the present invention.
Figure 4: illustrates the holder with sensing element and magnet in sensor housing according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS
The present invention is thus directed to a sensing device, particularly to a holder for retaining the sensing device in axial sensor, which is used to sense the rotational speed, position and direction of ferromagnetic wheel, said sensing device comprises sensing element and magnet for axial sensing. More particularly, the holder of the present invention maintains required gap between the magnet and sensing element and parallelism of the sensing element to the target to be sensed.

Figures 1 to 4 refers to the holder [1] for retaining a sensing device, said sensing device comprising of sensing element [2]; and magnet [3] for axial sensing. The sensing element [2] and magnet [3] accommodated within the holder [1] are separated by a pre-determined gap, said gap renders the sensing element [2] position in parallel to the target to be sensed in required angle with help of the holder [1]. Angular positioning of the sensing element [2] and magnet [3] is based on fitment of sensor/sensor element. The magnet [3] is positioned behind the sensing element [2] for back biasing the sensing element [2] in axial sensing application. The sensing element [2] and magnet [3] is accommodated within the holder [1] as shown in Figure 2 by snap lock which avoids adhesive application.

The sensing element [2] with one or more electrical terminals is soldered with Printed Circuit Board (PCB) [4], thereby retains the sensing element [2] and magnet [3] within the holder [1] as shown in Figure 3, so that magnet [3] weight will not create stress to the sensing element [2] terminals. During the soldering process, the perpendicularity of the sensing element [2] on the PCB [4] is maintained with the help of the holder [1].

In one aspect, the holder [1] is assembled on the PCB [4] using heat sealing process.

In another aspect, the holder [1] can be securely connected to the PCB [4] by one or more pins through heat sealing.

The holder [1] assembled on the PCB [4] is accommodated into sensor housing [5] with connector [6] as shown in Figure 4, said connector [6] is fixed to the assembled PCB [4]. The output from the connector [6] is fed to display unit or to an Electronic Control Unit (ECU) to process further to display or to control output from the sensing element [2] with magnet [3].

Though this invention is hereinbefore described and illustrated with reference to specific embodiments, obvious alterations and modifications known to persons skilled in the art are well within the scope of the appended claims.
,CLAIMS:WE CLAIM:
1. A holder [1] for retaining a sensing device, said sensing device comprising of sensing element [2]; and magnet [3] for axial sensing,
wherein the sensing element [2] and magnet [3] accommodated within the holder [1] are separated by pre-determined gap,
wherein said pre-determined gap renders the sensing element [2] position in parallel to the target to be sensed in required angle with help of the holder [1], and
wherein the magnet [3] is positioned behind the sensing element [2] for back biasing the sensing element [2] in axial sensing application.

2. The holder as claimed in claim 1, wherein the sensing element [2] and magnet [3] are accommodated within the holder [1] by snap lock.

3. The holder as claimed in claim 2, wherein the sensing element [2] with one or more electrical terminals is soldered with Printed Circuit Board (PCB) [4], thereby retains the sensing element [2] and magnet [3] within the holder [1].

4. The holder as claimed in claim 3, wherein perpendicularity of the sensing element [2] on the PCB [4] is maintained with the help of the holder [1].

5. The holder as claimed in claim 1, wherein angular positioning of the sensing element [2] and magnet [3] is based on fitment of sensor/sensor element.

6. The holder as claimed in claim 3, wherein the holder [1] assembled on the PCB [4] is accommodated into sensor housing [5] with connector [6], said connector [6] is fixed to the assembled PCB [4].

7. The holder as claimed in claim 6, wherein output from the connector [6] is fed to display unit or to an Electronic Control Unit (ECU) to process further to display or to control output from the sensing element [2] with magnet [3].