DESCRIPTION
OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL
INFORMATION RECORDING MEDIUM REPRODUCING DEVICE
5 TECHNICAL FIELD
[0001]
The present disclosure relates to an optical
information recording medium and an optical information
recording medium reproducing device applied to, for
10 example, a recordable optical disk.
BACKGROUND ART
[0002]
Conventionally, an optical disk which records
15 information or reproduces recorded information using
laser light has been practically used. As types of the
optical disk, there are a reproduction-only type, a
write-once type, and a rewritable type. In the writeonce
type and the rewritable type, it is necessary that
20 the address information indicating the position of the
optical disk be preliminarily recorded for the recording
of the information.
[0003]
As methods to record the address information, two
25 types have been known. One is a format which records the
address information as a preformat pit. The other is a
format in which a signal that forms a trench referred to
as a wobble for the trench is modulated by the address
information. In recording the preformat pit, there is a
30 problem that a recording area of user data and a
recording capacity of the optical disk decrease. In a
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wobble format, there is an advantage of not having such a
problem. A trench is referred to as a groove, and a
track formed by the groove is referred to as a groove
track. The groove is defined as a part which is
5 irradiated with laser light when the optical disk is
manufactured. An area sandwiched between the adjacent
grooves is referred to as a land, and the track formed by
the land is referred to as a land track.
[0004]
10 When an address is recorded by the wobble, a
method (suitably referred to as a land/groove recording
format) in which the data is recorded in both the groove
track and the land track is desirable, in order to
further increase the recording capacity. In the
15 land/groove recording format, the address information for
the groove track can be recorded by deflecting the laser
light when cutting. However, it is difficult to record
the address for the land track by the wobble. When the
land track is scanned, the wobbles of the groove track on
20 both sides are reproduced. Furthermore, these wobbles
are information of different groove tracks. Therefore,
the phases of the wobbles are not aligned, and it is
difficult to reproduce the wobbles normally.
[0005]
2 5 Conventionally, in the land/groove recording
format, the optical disk, capable of reproducing
addresses of both the groove track and the land track,
has been proposed. Patent Document 1 describes the
disclosure in which the address is intermittently
30 recorded and the phase of the recording position of the
address is reversed for the adjacent groove track, when
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the address is recorded in the groove track by the wobble
As a result of this, the address information originally
recorded is intermittently reproduced when a wobble track
is reproduced. Then, the addresses of the adjacent
5 groove tracks on both sides are reproduced alternately
when the land track is reproduced. Therefore, wobble
information (address information) can be obtained in
either of groove scanning and land scanning.
[0006]
10 Patent Documents 2 and 3 describe the disclosures
in which the land track and the groove track are each
wobbled, and the address information is recorded by the
wobble on a side wall on one side in each track. In
addition, an address information block of the wobble
15 track and the address information block of the groove
c
track are arranged by being shifted in a track direction.
CITATION LIST
PATENT DOCUMENTS
20 [0007]
Patent Document 1: Japanese Patent Application Laid-Open
No. 09-219024
Patent Document 2: Japanese Patent Application Laid-Open
No. 2003-178464
25 Patent Document 3: Japanese Patent Application Laid-Open
No. 2006-228293
SUMMARY OF THE INVENTION
PROBLEMS TO BE SOLVED BY THE INVENTION
30 [0008]
In the above-described disclosure described in
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Patent Document 1, as the address of the land track, the
address of one of the adjacent two groove tracks is
reproduced. Therefore, it is highly likely that the
groove address may become unreadable due to off-track.
5 In addition, in the disclosure described in Patent
Document 1, there are intermittently wobbles in the
groove track. The wobble is a signal to be a basis for
generating a clock corresponding to the position on the
optical disk. The clock is a signal necessary for both
10 recording and reproducing. Therefore, as Patent Document
1, the fact that there are intermittently sections
without the wobble in the groove track, is
disadvantageous in generating the clock with high
precision.
15 [0009]
In the disclosures described in Patent Document 2
and 3, the wobble is not interrupted. Therefore, there
is no problem in generating the clock. However, it is
necessary to wobble a trench wall on the one side in
20 order to record auxiliary information in addition to the
wobble of the basic frequency. The formation of the
wobble in this manner is difficult by the single laser
light when cutting, and there is a problem that a cutting
device becomes complex.
25 [0010]
Therefore, the present disclosure is intended to
provide an optical information recording medium capable
of being cut by the single laser light without the
wobbles being interrupted in the groove track, and an
30 optical information recording medium reproducing device.
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SOLUTIONS TO PROBLEMS
[0011]
To solve the above-described problem, the present
disclosure provides an optical information recording
5 medium of a CAV or a zone CAV,
wherein a groove which continuously wobbles is
preliminary formed and information is recorded in the
groove and a land adjacent to the groove,
the groove has a first wobble part which is
10 modulated by groove address information, a second wobble
part which is modulated by address information of one
adjacent land, and a third wobble part which is modulated
by address information of the other adjacent land,
a first section sandwiched between the second
15 wobble parts of adjacent two grooves and a second section
sandwiched between the third wobble parts of the adjacent
two grooves are formed on the land, and
one of phases of wobbles on both sides of the
first section and phases of wobbles on both sides of the
20 second section are substantially in-phase.
[0012]
The present disclosure provides an optical
information recording medium reproducing device
configured to optically reproduce an optical information
25 recording medium of a CAV or a zone CAV,
wherein a groove which continuously wobbles is
preliminary formed and information is recorded in the
groove and a land adjacent to the groove,
the groove has a first wobble part which is
30 modulated by groove address information, a second wobble
part which is modulated by address information of one
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adjacent land, and a third wobble part which is modulated
by address information of the other adjacent land,
a first section sandwiched between the second
wobble parts of adjacent two grooves and a second section
5 sandwiched between the third wobble parts of the adjacent
two grooves are formed on the land, and
one of phases of wobbles on both sides of the
first section and phases of wobbles on both sides of the
second section are substantially in-phase,
10 the optical information recording medium
reproducing device being configured to reproduce the
address information of the land, when the land is scanned,
from one of the first section and the second section in
which the phases of the wobbles are substantially in-
15 phase.
0
EFFECTS OF THE INVENTION
[0013]
According to the present disclosure, when the
20 recording is performed for both the groove and the land,
the address of the land can be recorded only by the
modulation of the groove. One of two pieces of
information reproduced when scanning the land is
considered to be a valid land address. A signal for
25 determining the validity is added, and the valid land
address information can be obtained in addition to the
result of an error correction code.
BRIEF DESCRIPTION OF DRAWINGS
30 [0014]
Fig. 1 is a schematic diagram for explanation of
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address data of a BD format.
Fig. 2 is a schematic diagram for explanation of
an ADIP unit of the BD format.
Fig. 3 is a schematic diagram for explanation of a
5 data structure of an ADIP word of the BD format.
Fig. 4 is a waveform diagram for explanation of an
MSK.
Figs. 5A and 5B are waveform diagrams for
explanation of an STW.
10 Figs. 6A and 6B are waveform diagrams for
explanation of the STW.
Fig. 7 is a diagram schematically showing a
pattern of a groove/land used for explanation of a first
embodiment of the present disclosure.
15 Fig. 8 is a schematic diagram showing kinds of
ADIP units used for explanation of a second embodiment of
the present disclosure.
Fig. 9 is a diagram schematically showing a
pattern of a groove/land used for explanation of the
20 second embodiment of the present disclosure.
Fig. 10 is a block diagram showing a reproducing
device according to the second embodiment of the present
disclosure.
Fig. 11 is a flowchart for explanation of a first
25 example of validity determining processing for an address
according to the second embodiment of the present
disclosure.
Fig. 12 is a flowchart for explanation of a second
example of the validity determining processing for the
30 address according to the second embodiment of the present
disclosure.
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Fig. 13 is a flowchart for explanation of a third
example of the validity determining processing for the
address according to the second embodiment of the present
disclosure.
5
MODE FOR CARRYING OUT THE INVENTION
[0015]
The embodiments to be described below are
preferred examples of the present disclosure, and various
10 limitations technically preferable are added thereto.
However, the scope of the present disclosure is not
limited to these embodiments unless there is a
description to limit the present disclosure particularly
in the following explanation.
15 The following description is made in the following
order.
<1. BD Format>
<2. First Embodiment>
<3. Second Embodiment>
20 <4. Modification
[0016]
<1. BD Format>
In the present disclosure, a format of address
information, or the like complies with the BD (Blu-ray
25 Disc (registered trademark) format. As a result of this,
much of the technology practically used of BD, being a
high density optical disk, can be used. Therefore, the
address information in a BD format will be described
prior to the description of the present disclosure.
30 [0017]
As shown in Fig. 1, main data to be written is a
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sequence {RUBn+0/ RUBn+1/ RUBn+2/ RUBn+3 • • •) of a recording
unit block (RUB). The RUB is a unit for recording main
data (recording/reproducing data), and is set to be a
predetermined length, for example, 64k bytes. Three
5 addresses in pregroove (ADIP) words, ADIPO, ADIPl and
ADIP2, are allotted to each RUB. ADIPO, ADIPl and ADIP2
have identical address information.
[0018]
In one ADIP word, 83 (unit numbers 0 to 82) ADIP
10 units are included. In one ADIP word, the address
information of 24-bit, auxiliary data of 12-bit, a
reference region, an error correction code, and the like
are stored. The above information is represented by
using, for example, 60 ADIP units in 83 ADIP units.
15 [0019]
e
As shown in Fig. 2, a set of a total of 56 wobbles
is considered to be the ADIP unit. One bit of "0" or "1",
synchronization information, a reference unit, or a
monotone unit is represented by this ADIP unit. One
20 wobble is one cycle of, for example, a basic wobble
waveform (cos(2nft)). Therefore, one ADIP word includes
(83 x 56) wobbles. In Fig. 2, eight kinds (monotone unit,
reference unit, four kinds of synchronization units, and
two kinds of data units which respectively represent w 0"
25 and ul" of data ) of ADIP units are shown. In Fig. 2, a
set of 38 wobbles is shown due to the spatial restriction.
[0020]
As shown in Fig. 2, the wobble numbers 0 to 55 are
added to the ADIP unit including 56 wobbles and the 56
30 wobbles are distinguished. For example, the sections
with wobble numbers 0 to 2 are modulated by minimum shift
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keying (MSK), and the sections with wobble numbers 18 to
55 of the reference unit and the data unit are modulated
by a saw tooth wobble (STW). Monotone wobbles, which are
not modulated, wobble at a basic wave of a predetermined
5 frequency (cos(2nft)).
[0021]
The ADIP word has a data structure as shown in Fig.
3. Types of ADIP units in Fig. 3 correspond to the kinds
of the ADIP units in Fig. 2. Data of 60-bit is included
10 in one ADIP word.
[0022]
As shown in Fig. 4, three wobbles are included in
the MSK. The polarity is inverted at the portion in
which a waveform of the wobble at the center is not the
15 MSK, since the frequency of the previous or next wobble
is made 1.5 times the basic wave. The MSK is arranged at
the head (0 to 2nd wobbles) of each ADIP unit and used
for detecting a heading position of the ADIP unit.
[0023]
20 In addition, as shown in Fig. 2, the MSK is
arranged at the position of the 14th to 16th wobbles from
the head of the ADIP unit of the data 0 and at the
position of the 12th to 14th wobbles from the head of the
ADIP unit of the data 1. In this manner, the data 0 and
25 1 are represented by the position of the MSK.
[0024]
In the ADIP unit of the data 0, the MSK is set to
be 0 and the STW representing 0 is arranged in the
sections of the 18th to 55th wobbles from the head. In
30 the ADIP unit of the data 1, the MSK is set to be 1 and
the STW representing 1 is arranged in the sections of the
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18th to 55th wobbles from the head.
[0025]
An STW format generates a modulation waveform
similar to saw-tooth by adding or subtracting a secondary
5 harmonic wave (sin(2n2ft)) to/from the basic wave
(cos{2nft)). An amplitude of the secondary harmonic wave
is small which is about one-fourth of that of a basic
waveform. One of adding and subtracting is selected by
"0" or "1" of the data, and therefore the modulation
10 waveforms differ. The wobble numbers of the reference
unit and the data unit are repeatedly recorded in the
18th to 55th section.
[0026]
The reason why two types of formats are used in
15 this manner is for making it possible to make up for the
disadvantage of each format. In an MSK format, 1-bit is
recorded by modulating three wobbles at the head of the
ADIP unit, and therefore can be used as a standard to
decide the position of the data at the time of
20 reproducing. On the other hand, in the STW format, a
very small waveform change is repeatedly recorded over a
wide range, and distinguishes "0" or "1" by integrating a
reproducing signal at the time of reproducing. Therefore,
it is difficult to use the reproducing signal as
25 information to detect a separation of the data. However,
the MSK format which is a local recording format is
susceptible to a defect caused by a flaw, dust, or the
like on a disk. The STW format has an advantage of being
less susceptible to the defect because recording is
30 performed for a longer period of time.
[0027]
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A modulation wobble signal of the STW format will
be described in more detail with reference to Figs. 5 and
6. In Figs. 5 and 6, a horizontal axis represents a time
axis, one cycle (that is, one wobble) of the basic wobble
5 waveform is shown, and a vertical axis represents a
normalized amplitude. Fig. 5A shows the waveform when
data c(n) is "1" and Fig. 6A shows the waveform when data
c(n) is "0".
[0028]
10 In Figs. 5A and 6A, the waveform shown in a broken
line is the basic wobble waveform SO (= cos(2nft)). In a
case where c(n) = "1", the modulated waveform SI is
formed by adding a sin signal having the double frequency
of the basic wobble waveform SO. That is, SI =
15 Acos(2nft) + asin(2n2ft) is satisfied. The relation is A
> a, and for example, A = 1 and a = 0.2 are satisfied.
This modulation wobble waveform SI is the waveform which
is modulated so that a rising (an outside direction of
the disk in a radial direction of the disk) in a time
20 direction is gentle compared with the basic wobble
waveform SO, and so that a falling (an inside direction
of the disk in the radial direction of the disk) in the
time direction is steep compared with the basic wobble
waveform SO.
25 [0029]
As shown in Fig. 6A, in a case where c(n) = "0", a
modulated waveform S2 is formed by subtracting the sin
signal having the double frequency of the basic wobble
waveform SO. That is, S2 = Acos(2nft) - asin(2n2ft) is
30 satisfied. This modulation wobble waveform S2 is the
waveform which is modulated so that the rising (the
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outside direction of the disk) in the time direction is
steep compared -with the basic wobble waveform SO, and so
that the falling (the inside direction of the disk) in
the time direction is gentle compared with the basic
5 wobble waveform SO. In both the modulation wobble
waveforms Si and S2, a zero-cross point is the same phase
as that of the basic wobble waveform, and the clock at
the reproducing side can be easily extracted.
[0030]
10 In Figs. 5A and 6A, waveforms S3 and S4 each show
a solution obtained by multiplying the sin signal
(sin(2n2ft)), in which the frequency used in processing
at the reproducing side is the double frequency of the
basic wave, by a reproducing modulation wobble signal.
15 That is, the waveform S3 is obtained by the reproducing
modulation wobble waveform SI x sin(2n2ft), and the
waveform S4 is obtained by the reproducing modulation
wobble waveform S2 x sin(2n2ft).
[0031]
20 At the reproducing side, as shown in Figs. 5B and
6B respectively, integrated values ES3 and SS4 can be
obtained by integrating (accumulating) the waveforms S3
and S4 over one wobble cycle. The integrated value ES3
at the time when one wobble cycle has passed, is a
25 positive value vl. On the other hand, the integrated
value 2S4 at the time when one wobble cycle has passed,
is a negative value vO. The integrated value is treated,
for example, as vl = +1, vO = -1.
[0032]
30 Since 1-bit of the data is represented by 56
wobbles, +56 is obtained as the integration result of 56
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wobbles when all wobbles are +1, and -56 is obtained as
the integration result of 56 wobbles when all wobbles are
-1. A reproduced chip sequence obtained as the
integrated value of each wobble is multiplied by the same
5 code sequence used in recording. Based on the result
obtained and the integration result of 56 wobbles, 1-bit
<"l"/"0") of the data is determined
[0033]
<2. First Embodiment>
10 [Main Difference from BD Format]
In a first embodiment of the present disclosure,
the main difference from the BD format described above is
as described below.
- In the BD format, a disk is rotated at a
15 constant linear velocity (hereinafter refer to as CLV).
On the other hand, in the present disclosure, the disk is
rotated at a constant angular velocity (hereinafter
referred to as CAV}. A zone CAV can also be employed.
The zone CAV divides the disk in a radial direction,
20 forms a plurality of zones, and controls the CAV within
the zone. In a spiral wobble track, phases of the basic
wave of a wobble can be synchronized with each other in
the radial direction of the disk by the CAV or the zone
CAV.
25 [0034]
- In the BD format, a groove recording format
which records in a groove is used. On the other hand, in
the present disclosure, recording is performed on both
the groove and a land in order to increase a recording
30 capacity. As described above, a trench is referred to as
the groove, and a track formed by the groove is referred
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to as a groove track. The groove is defined as a part
which is irradiated with laser light when the optical
disk is manufactured. An area sandwiched between the
adjacent grooves is referred to as a land, and the track
5 formed by the land is referred to as a land track.
[0035]
A land track address is given to the land track.
As the BD format, three address words are recorded in the
groove track for every predetermined recording unit, for
10 example, the RUB. One in three ADIP words is an address
of the groove track, and the other two are the addresses
of the land track. One of the two addresses of the land
track is the address of the land track at the inner
peripheral side in the radial direction of the disk. The
15 other is the address of the land track at the outer
peripheral side in the radial direction of the disk.
Each address of the land track is recorded in the
adjacent groove tracks on both sides. That is, each land
address is recorded in the groove tracks adjacent on both
20 sides.
[0036]
[Arrangement (Recording) of Address Information]
An arrangement of address information according to
the first embodiment of the present disclosure will be
25 described with reference to Fig. 7. Fig. 7 schematically
shows the groove track (Grv) and the land track (Lnd)
continuing in the radial direction of the disk. As an
example, the upper side of the figure shows the inner
side (center side) of the disk, and the lower side shows
30 the outer peripheral side of the disk. The groove is
formed spirally from the inner side toward the outer side
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of the disk so that the track address increases toward
the outer side. In addition, a beam spot
(recording/reproducing beam spot) is used for scanning
from left to right in the figure.
5 [0037]
In addition, in Fig. 7, a part of the three ADIP
words (ADIPO, ADIPl, ADIP2) defined for every
predetermined data unit, for example, the RUB is
extracted and shown by focusing on the position of the
10 MSK of the data unit included in the ADIP word so that
the difference in addresses from the adjacent track is
easily understood. These ADIP words are formed in
different positions in a track direction. Each ADIP word
includes 83 ADIP units, and each ADIP unit includes 56
15 wobbles as with those of the BD format. Then, each ADIP
word includes address Information, an error correction
code, and the like. Each ADIP word includes (56 x 83)
wobbles. The wobble track in Fig. 7 shows only a part of
the wobbles, for example, only a head part of each ADIP
20 unit. In Fig. 7, as an example, the groove track has an
even-numbered track number, and the land track has an
odd-numbered track number.
[0038]
In Fig. 7, the groove tracks Trkn, Trk(n+2),
25 Trk(n+4}, ... {n = 0, 1, 2, ...) are shown. The tracks
Trk{n+1), Trk(n+3} ... sandwiched between the groove
tracks on both sides are the land tracks. The address
information (hereinafter suitably referred to as a groove
address} n, n+2, n+4, ... of the groove track is recorded
30 as the first word ADIPO of each groove track. The
address information (hereinafter suitably referred to as
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the land address) n+1, n+5, ... of the land track is
recorded as the next word ADIPl. The land address n+3,
n+7, ... is recorded as the third word ADIP2. The groove
address and the land address are recorded, for example,
5 in the MSK format.
[0039]
The land address is doubly recorded in each groove
in this manner. For example, the land address recorded
as one address word ADIPl of the groove track Trkn is the
10 address of the land track Trk(n+1) adjacent to the outer
side. The land address recorded as the other address
word ADIP2 of the groove track Trkn is the address of the
land track adjacent to the inner side.
[0040]
15 In addition, the land address recorded as one
address word ADIPl of the groove track Trk(n+2) is the
address of the land track Trk(n+1} adjacent to the inner
side. The land address recorded as the other address
word ADIP2 of the groove track Trk(n+2) is the address of
20 the land track Trk(n+3) adjacent to the outer side.
[0041]
That is, in the ADIPl section in the ADIP word,
the land address of the land track Trk(n+1) is recorded
in the adjacent groove track Trkn and groove track
25 Trk(n+2) on both sides. Since the same address data has
been recorded, the wobble phases on both sides of a
recording area become substantially the same. Therefore,
when the land track Trk(n+1) is scanned with the beam
spot, the land address of the land track can be
30 reproduced using a push-pull format.
[0042]
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In addition, in the ADIP2 section in the ADIP word,
the land address of the land track Trk(n+3) is recorded
in the adjacent groove track Trkn(n+2) and groove track
Trk(n+4) on both sides. Since the same address data has
5 been recorded, the wobble phases on both sides of the
recording area, including the position of an MSK mark,
become substantially the same. Therefore, when the land
track Trk(n+3) is scanned with the beam spot, the land
address of the land track can be reproduced using the
10 push-pull format.
[0043]
As described above, in addition to its own groove
address, the adjacent two land addresses on both sides
are recorded in each groove track. Therefore, when the
15 land track is scanned, in the part of the land track
e
sandwiched between the sections of the groove tracks
which record the same address, the phase of the wobble
changes in the same way, and the land address can be
acquired from the wobble.
20 [0044]
In the first embodiment of the present disclosure,
the groove address and the land address can be recorded
in a similar format to the BD format which records the
ADIP word triply in an RUB unit. For example, these
25 addresses can be recorded as the wobble track which is
modulated in the MSK format. In addition, since the land
address can also be recorded only by the wobble of the
groove track, it is possible to record the address
without significantly changing a mastering device of the
30 existing BD format.
[0045]
19
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<3. Second Embodiment>
[Configuration of ADIP Unit]
In the first embodiment described above, when a
land track, for example the land track Trk(n+1) is
5 scanned with a beam spot, an address of the land track
can be acquired in the ADIP1 section. Then, the next
ADIP2 section is identified as error data by error
correction since the different address information is
also reproduced. When the next land track Trk(n+3) is
10 scanned with the beam spot, the address of the land track
can be acquired in the ADIP2 section. Then, the previous
ADIPl section is identified as error data.
[0046]
However, due to the reason such as detrack, the
15 error correction is performed on the address of one
adjacent groove track in an invalid address part, and the
address may be treated as a valid address. In this case,
two addresses are considered to be valid, and therefore,
it is not possible to determine which address is valid.
20 In a second embodiment of the present disclosure, such a
problem is solved.
[0047]
In the second embodiment, a groove address and a
land address are recorded by an MSK, and the validity of
25 the land address is determined by using an STW which has
been introduced into a BD format. As a result, the
above-described problem is solved.
[0048]
As shown in Fig. 2, there are eight kinds as ADIP
30 units in the BD format. As shown in Fig. 8, twelve kinds
of ADIP units are defined in the second embodiment of the
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present disclosure. As can be seen by comparing Figs. 2
and 8, a monotone unit, a reference unit, and sync units
0 to 3 are the same as those of the BD format. As to an
MSK part of the groove address, a data unit is similar to
5 that of the BD format. A non-modulation basic waveform
(monotone) is arranged in place of the STW in an STW part
in the data unit of the groove address.
[0049]
The MSK which represents the land address is
10 similar to that of a groove and the BD format. Two kinds
of ADIP units, having the different STW arranged in the
wobble numbers 18 to 55, are defined even in a data 0
unit. Similarly, two kinds of ADIP units, having the
different STW arranged in the wobble numbers 18 to 55,
15 are defined even in a data 1 unit. The ADIP word has a
similar data structure to that of the BD format.
[0050]
That is, in one ADIP word, 83 (unit numbers 0 to
82) ADIP units are included. Data such as the address
20 information is represented by using, for example, 60 ADIP
units in 83 ADIP units in one ADIP word. Therefore, STW
data of 60 ADIP units can be possessed. All of these
STWs are used to determine the validity of the land
address.
25 [0051]
As an example, when the remainder, obtained by
dividing the track number of the land track represented
by the address by 8, is 1 or 3, the STW is considered"to
be 1, and when the remainder is 5 or 7, the STW is
30 considered to be 0. In the groove address, the STW is
not added and the monotone is added. As a result of this,
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SP346948WO00
the STW values of the land address recorded in the
adjacent two grooves are the same in a valid land address.
On the other hand, the STW values of the land address
recorded in the adjacent two grooves are different in an
5 invalid land address. As a result, the amplitude of the
STW while scanning the land track becomes small.
[0052]
Fig. 9 shows a more concrete example of the groove
address and the land address. In the groove address, the
10 monotone is added after the data part. In the land
address, the STW is added after the data, and the STW
representing the same data is added to a pair (surrounded
and shown by the broken line in Fig. 9} of land addresses
included in the valid land address.
15 [0053]
e
At the time of reproducing, the validity of the
address is determined in the ADIP word by using the
integration results of the reference units (15 units) and
the integration results of the STWs (60 STWs). In an STW
20 amplitude, the longer the integration section, the higher
the reliability. In the second embodiment of the present
disclosure, all of the integration results of the
reference units and the integration results of the data
units in the ADIP word can be used in determining whether
25 the land address is valid. As a result, even with a
defect and the like, determination is performed without
problems.
[0054]
[Disk Reproducing Device]
30 With a disk reproducing device according to the
second embodiment of the present disclosure, reproduction
22
SP346948WO00
of the address is mainly described. As shown in Fig. 10,
the data is recorded on an optical disk 1 in which the
groove address and the land address are recorded, and the
data is reproduced from the optical disk 1.
5 [0055]
The optical disk 1 is rotated by a spindle motor 2
at a constant angular velocity. That is, the optical
disk 1 is rotated by a CAV format. A zone CAV format may
also be used. A drive signal from a laser drive part 4
10 is supplied to an optical head 3. A laser beam, the
intensity of which is modulated based on recorded data 5,
is emitted to the optical disk 1 from the optical head 3.
Then the data is recorded in a predetermined position,
which is determined based on the address information
15 reproduced, of the optical disk 1.
[0056]
A reading laser beam is emitted to the optical
disk 1 from the optical head 3. The reflected light is
detected by a photo-detector in the optical head 3 and a
20 reproducing signal is detected by a signal detecting part
6. A reproducing signal 7, a servo error signal 8 such
as a focus error signal and a tracking error signal, and
a wobble signal 9 are extracted from the signal detecting
part 6. The wobble signal 9 is an output signal of a
25 detector in which a photo-detection element is divided
into two in a track direction. For example, a signal of
the sum of two detectors is extracted as the wobble
signal 9. The wobble signal 9 corresponds to a wobble
waveform. When the phases of the wobbles on both sides
30 of the track are the same, the level of the wobble signal
9 becomes maximum. On the other hand, when the phases of
23
SP346948WO00
the wobbles on both sides are opposite, the level of the
wobble signal 9 becomes minimum.
[0057]
The error signal 8 is supplied to a servo circuit
5 10. By the servo circuit 10, the rotation of the spindle
motor 2 is controlled at the constant angular velocity
and the focus and the tracking of the optical head 3 are
controlled.
[0058]
10 The wobble signal 9 detected by the signal
detecting part 6 is supplied to an A/D converter 11.
Then the wobble signal 9 is converted to a digital signal
by the A/D converter 11. The output signal of the A/D
converter 11 is supplied to a digital phase locked loop
15 (PLL) 12 and an arithmetic unit 15. The clock
synchronizing with the reproducing signal is output from
the PLL 12. The clock is made to be a basis of timing of
the processing at the time of reproducing. The clock is
supplied to the arithmetic unit 15 from the PLL 12.
20 [0059]
A digital output of the wobble signal 9 is
supplied to an ADIP decoder 13. The ADIP decoder 13
decodes address data and the like recorded as the MSK for
every ADIP word, and performs error correction. The
25 address data decoded by the ADIP decoder 13 is supplied
to a validity determining part 14. Groove address
information is extracted as output when the groove track
has been scanned. When the land addresses has been
scanned, the two land addresses are temporarily retained,
30 and the only land address determined as valid by the
validity determining part 14 is output.
24
SP346948WO00
[0060]
In the arithmetic unit 15, as described above, a
sin signal (sin(2n2ft)) in which the frequency is twice
the frequency of the basic wave is multiplied by the
5 wobble signal (STW) reproduced. That is, S3 = Si x
sin(2n2ft) or S4 = S2 x sin(2n2ft) can be obtained. The
output signal of the arithmetic unit 15 is supplied to an
integrator 16. Then, the integration within one wobble
cycle is performed in the integrator 16. The integration
10 result within one wobble cycle is +1 or -1.
[0061]
In the second embodiment of the present disclosure,
the STWs are included in the reference unit and the data
unit of the land address. In one ADIP, STWs of 15
15 reference units and 60 data units are included. The
integration result of the reference unit by the
integrator 16 is supplied to an accumulator 17. Then,
the integration result corresponding to the 15 reference
units is accumulated in the accumulator 17. Similarly,
20 the integration result of the STW of the data unit by the
integrator 16 Is supplied to an accumulator 18. Then the
integration result corresponding to the 60 reference
units is accumulated in the accumulator 18.
[0062]
25 The integration result of one ADIP word section of
the reference unit by the accumulator 17 and the
integration result of the ADIP word section of the data
unit are supplied to the validity determining part 14.
The validity determining part 14 determines whether the
30 land address is valid using these integration results.
[0063]
25
SP346948WO00
[First Method of Determining Validity of Land Address]
A first method of determining validity of the land
address will be described with reference to Fig. 11. In
Step Si, it is determined whether the decoding of three
5 ADIP words has finished when the land track is scanned.
[0064]
When it is determined in Step Si that the decoding
of three ADIP words has finished, the validity is
determined in Step S2. The reference STW average value
10 is calculated by dividing an integrated value of the STW
amplitude in a reference part by 15. A data STW average
value is calculated by dividing an integrated value of
the STW amplitude in a data part by 60. Absolute values
are taken of the reference STW average value and the data
15 STW average value and compared. The absolute values are
p
compared since there is a case where the STW amplitude in
the data part is (-1}.
[0065]
As can be seen from Fig. 9, the three ADIP words
20 reproduced in a case where the land address is scanned
are as described below.
Groove address: The reference STW average value is
substantially 1, and the data STW average value is
substantially 0 since the monotone is added. Actually
25 these values do not often become exactly 0 or 1 affected
by noise, etc. Therefore "substantially" is added.
Valid land address: The reference STW average
value is substantially 1, and the data STW average value
is substantially 1 since the STWs are in-phase.
30 Invalid land address: The reference STW average
value is substantially 1, and the data STW average value
26
SP346948WO00
is substantially 0 or a small value since the STWs are
reversed-phase.
[0066]
Therefore, in Step S2, the reference STW average
5 value and the data STW average value are compared. Then
the address having the data STW average value, which is
the closest to the reference STW average value, is
determined as the valid land address.
[0067]
10 [Second Method of Determining Validity of Land Address]
A second method of determining validity of the
land address will be described with reference to Fig. 12.
In Step Sll, it is determined whether the decoding of
three ADIP words has finished when the land track is
15 scanned.
[0068]
When it is determined in Step Sll that the
decoding of three ADIP words has finished, the validity
is determined in Step S12. In Step S12, the land address
20 in which the data STW average value is the largest, is
determined as the valid land address. As described above,
in the groove address and the invalid land address, the
data STW average value is small.
[0069]
25 [Third Method of Determining Validity of Land Address]
A third method of determining validity of the land
address will be described with reference to Fig. 13. In
Step S21, it is determined whether the decoding of three
ADIP words has finished when the land track is scanned.
30 [0070]
When it is determined in Step S21 that the
27
SP346948WO00
decoding of three ADIP words has finished, the data STW
average value and a threshold value are compared in Step
S22. That is, it is determined whether the data STW
average value exceeds the threshold value. When the data
5 STW average value exceeds the threshold value, the land
address is confirmed as valid in Step S23. The threshold
value is set to an appropriate value to determine the
validity of the address. For example, the threshold
value may be generated using the reference STW average
10 value.
[0071]
In the above-described validity determining method
for the land address, the valid land address can be
reproduced by determining whether the data part of the
15 land track is sandwiched by the in-phase STWs or
sandwiched by the reversed-phase STWs. That is, it is
possible to determine the correct land address without
depending on the result of error correction.
[0072]
20 <4. Modification>
Although the embodiments of the present disclosure
have been described specifically as above, the present
disclosure is not limited to each embodiment described
above, and can be modified in various ways based on the
25 technical concept of the present disclosure. For example,
the configurations, methods, steps, shapes, materials,
and numerical values given in the embodiments described
above are merely examples, and if necessary, different
configurations, methods, steps, shapes, materials, and
30 numerical values may be used.
[0073]
28
SP346948WO00
In the present disclosure, it is possible to
employ the following configurations.
(1)
An optical information recording medium of a CAV
5 or a zone CAV,
wherein a groove which continuously wobbles is
preliminary formed and information is recorded in the
groove and a land adjacent to the groove,
the groove has a first wobble part which is
10 modulated by groove address information, a second wobble
part which is modulated by address information of one
adjacent land, and a third wobble part which is modulated
by address information of the other adjacent land,
a first section sandwiched between the second
15 wobble parts of adjacent two grooves and a second section
sandwiched between the third wobble parts of the adjacent
two grooves are formed on the land, and
one of phases of wobbles on both sides of the
first section and phases of wobbles on both sides of the
20 second section are substantially in-phase.
(2)
The optical information recording medium described
in (1), wherein the first wobble part, the second wobble
part, and the third wobble part are formed on different
25 positions in a track direction.
(3}
An optical information recording medium
reproducing device configured to optically reproduce an
optical information recording medium of a CAV or a zone
30 CAV,
wherein a groove which continuously wobbles is
1:
29
SP346948WO00
preliminary formed and information is recorded in the
groove and a land adjacent to the groove,
the groove has a first wobble part which is
modulated by groove address information, a second wobble
5 part which is modulated by address information of one
adjacent land, and a third wobble part which is modulated
by address information of the other adjacent land,
a first section sandwiched between the second
wobble parts of adjacent two grooves and a second section
10 sandwiched between the third wobble parts of the adjacent
two grooves are formed on the land, and
one of phases of wobbles on both sides of the
first section and phases of wobbles on both sides of the
second section are substantially in-phase,
15 the optical information recording medium
reproducing device being configured to reproduce the
address information of the land, when the land is scanned,
from one of the first section and the second section in
which the phases of the wobbles are substantially in-
20 phase.
(4)
The optical information recording medium
reproducing device described in (3),
wherein a determination signal for determining one
25 of the address information reproduced in the first
section and the address information reproduced in the
second section as valid, is added to each of the second
wobble part and the third wobble part.
(5)
30 The optical information recording medium
reproducing device described in (3) or (4),
30
SP346948WO00
wherein the determination signal is a waveform
signal in which a harmonic signal having different
polarities depending on data is added to a basic waveform.
(6)
5 The optical information recording medium
reproducing device described in any one of (3), (4), and
(5),
wherein the optical information recording medium
reproducing device has a detector that is divided into at
10 least two in a track direction of the optical information
recording medium, and detects return light from the
optical information recording medium, and
the optical information recording medium
reproducing device reproduces the first wobble part and
15 the second wobble part by output of a light receiving
part on both sides in the track direction of the detector,
(7)
The optical information recording medium
reproducing device described in any one of (3), (4), (5),
20 and (6), wherein the basic waveform is modulated in an
MSK format by the address information.
REFERENCE SIGNS LIST
[0074]
25 1 OPTICAL DISK
2 SPINDLE MOTOR
3 OPTICAL HEAD
12 PLL
13 ADIP DECODER
30 14 VALIDITY DETERMINING PART
16 INTEGRATOR

CLAIMS
1. An optical information recording medium of a CAV
or a zone CAV,
wherein a groove which continuously wobbles is
5 preliminary formed and information is recorded in the
groove and a land adjacent to the groove,
the groove has a first wobble part which is
modulated by groove address information, a second wobble
part which is modulated by address information of one
i
10 adjacent land, and a third wobble part which is modulated
by address information of the other adjacent land,
a first section sandwiched between the second
wobble parts of adjacent two grooves and a second section
sandwiched between the third wobble parts of the adjacent
15 two grooves are formed on the land, and
one of phases of wobbles on both sides of the
first section and phases of wobbles on both sides of the
second section are substantially in-phase.
20 2. The optical information recording medium according
to claim 1, wherein the first wobble part, the second
wobble part, and the third wobble part are formed on
different positions in a track direction.
25 3. An optical information recording medium
reproducing device configured to optically reproduce an
optical information recording medium of a CAV or a zone
CAV,
wherein a groove which continuously wobbles is
30 preliminary formed and information is recorded in the
groove and a land adjacent to the groove,
the groove has a first wobble part which is
modulated by groove address information/ a second wobble
part which is modulated by address information of one
adjacent land/ and a third wobble part which is modulated
5 by address information of the other adjacent land,
a first section sandwiched between the second
wobble parts of adjacent two grooves and a second section
sandwiched between the third wobble parts of the adjacent
two grooves are formed on the land, and
10 one of phases of wobbles on both sides of the
first section and phases of wobbles on both sides of the
second section are substantially in-phase,
the optical information recording medium
reproducing device being configured to reproduce the
15 address information of the land, when the land is scanned,
from one of the first section and the second section in
which the phases of the wobbles are substantially inphase.
20 4. The optical information recording medium
reproducing device according to claim 3,
wherein a determination signal for determining one
of the address information reproduced in the first
section and the address information reproduced in the
25 second section as valid/ is added to each of the second
wobble part and the third wobble part.
5 . The optical information recording medium
reproducing device according to claim 4,
30 wherein the determination signal is a waveform
signal in which a harmonic signal having different
polarities depending on data is added to a basic waveform.
6. The optical information recording medium
'il:'- "reproducing -"device- "according"'-to-' claim- 3,-1 - - • "•""' '"
5 wherein the optical information recording medium
reproducing device has a detector that is divided into at
least two in a track direction of the optical information
recording medium, and detects return light from the
optical information recording medium, and
10 the optical information recording medium
reproducing device reproduces the -first wobble part and
the second wobble part by output of a light receiving
part on both sides in the track direction of the detector.
7. The optical information recording medium
reproducing device according to claim 3, wherein a basic
waveform is modulated in an MSK format by the address
information.