JP2001344764A - Information recording medium and method for recording and reproducing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium and a method for recording and reproducing the same capable of surely protecting a copyright and surely detecting the regional positions and a layer by changing the side of a land in accordance with the case of including a discontinuous area, plural layers, the divided regions of an area or a region related with copyright information, etc., when address information or a frequency signal are formed as land pre-pits on one side of the land. SOLUTION: Concerning a guiding groove formed on a disk substrate and a frequency signal and/or an address signal recorded on one side (the first side, e.g.) of the guiding groove, the side surface of the guiding groove for recording the frequency signal or the address signal is changed depending on the region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing area (guide groove, groove), and address information of the recording / reproducing area is provided on one side of the land (between the guide grooves) by a land pre-pit (hereinafter referred to as "LPP"). For example, the present invention relates to an information recording medium capable of recording and reproducing in the future, such as a DVD-RW and an information recording medium having a multi-layered recording layer developed from this technology, and a recording and reproducing method for the information recording medium.

[0002]

2. Description of the Related Art Generally, in a high-density recording type disc such as a DVD-RW which can be recorded a plurality of times with compatibility with a DVD video, contents protected by copyright are distinguished from contents not protected by copyright. It must be ensured that illegal copying (recording and playback) of the content is not performed without permission. A DVD video is a playback-only disk. Copyright information that prohibits copying of content is recorded in a predetermined area (information area related to copyright protection such as a CSS key) of the disk by CSS (content scramble system). I have. Then, a system for preventing illegal copying is adopted, in which a DVD-Video playback device reads information related to copyright protection such as the CSS key and reproduces the content using the information related to copyright protection such as the CSS key. ing.

[0003]

A high-density disc in which DVD-Video contents are recorded together with information on copyright protection by the above-described high-density disc recording apparatus is called a DV.
When reproduced by a D-video reproducing apparatus, there is a possibility that information on copyright protection can be read out, so that the content of a copy-protected DVD video can be reproduced. As a result, the copyright of the copy-protected DVD video cannot be sufficiently copyrighted. There was a problem that there was a possibility. Further, when the recording area is divided into zones, it is required to clarify the difference between the address signals in each zone. In a disk having a multilayer recording layer, for example, the traveling direction of the spiral groove is In such a case, it was required to clarify the difference between the addresses in each layer. Furthermore, when recording and reproducing information related to copyright protection, there has been a demand for a method that enables or disables reproduction of an address in order to perform copyright protection.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to an information recording medium formed of a spiral or concentric information track and having an information recordable area. A recording area having a guide groove formed therein, wherein a frequency signal and / or an address signal is recorded on a first side of the guide groove in a first area of the information recording area; In an area other than the first area, the frequency signal and / or the address signal are recorded on the opposite side of the guide groove from the first side. In addition, the present invention, in order to solve the above problems,
An information recording medium formed from a spiral information track and having an information recordable area, wherein the information track has a recordable area in which a guide groove is formed, and in a first area of the recordable area, A frequency signal and / or an address signal is recorded outside the guide groove with respect to the traveling direction of the recording track when performing recording or reproduction, and recording or reproduction is performed in an area other than the first area of the recordable area. The information recording medium is characterized in that the frequency signal and / or the address signal are recorded inside the traveling direction of the recording track when performing the recording. According to another aspect of the present invention, there is provided an information recording medium formed of a spiral or concentric information track and having a plurality of information recordable areas, wherein a guide groove is formed in the information track. A recordable area, and a first layer area of the information recording area has a first groove of the guide groove.
Side, a frequency signal and / or an address signal are recorded, and in a layer area other than the first layer area of the information recording area, the frequency signal and / or the address signal are
An information recording medium is provided which is recorded on a side of the guide groove opposite to the first side. According to another aspect of the present invention, there is provided an information recording medium formed from a spiral information track and having a plurality of information recordable areas, wherein a guide groove is formed in the information track. Having a region, in the first layer region of the recordable region, a frequency signal and / or an address signal are recorded outside the guide groove with respect to a traveling direction of the recording track when performing recording or reproduction, In a layer area other than the first layer area of the recordable area, the frequency signal and / or the address signal are recorded inside a traveling direction of the recording track when performing recording or reproduction. An information recording medium is provided. According to another aspect of the present invention, there is provided an information recording medium recorded on an information recording medium according to any one of claims 1 to 4, wherein the information recording area is formed from a spiral or concentric information track and has an information recordable area. An identification step of reproducing identification information for identifying information on the position of the frequency signal and / or the address from the information on the information recording medium, and a detection step of detecting the frequency signal and / or the address by the identification result of the identification step; A recording / reproducing step of performing recording / reproducing based on the frequency signal and / or the address detected in the detecting step. 5. The frequency signal recorded on an information recording medium according to claim 1, further comprising an information recordable area formed from a spiral or concentric information track to solve the above-mentioned problem. And / or a first detecting step of detecting information on an address position by a predetermined threshold, and a determining step of determining the polarity of the frequency signal and / or information on the address position detected in the first detecting step. A changing step of changing a threshold for detecting the frequency signal and / or the address, a second detecting step of detecting the frequency signal and / or the address, and a second detecting step of detecting the frequency signal and / or the address based on the result of the determining step. A recording / reproducing step of performing recording / reproducing based on the detected frequency signal and / or address. It provides a method of recording and reproducing an information recording medium according to symptoms.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a recordable disc such as a DVD-RW, a predetermined area of the disc in which information related to the copyright protection of a DVD video is recorded in an ordinary state (information area related to copyright protection) Then, record information on copyright protection information with embossed pre-pits,
It is processed so that the copyright protection information cannot be overwritten later. Thus, when the DVD video content is recorded on the DVD-RW by the high-density type disc recording device and the content is not compatible with the copyright protection information, and when the DVD video playback device reproduces the content, the content is compatible with the content. Since the copyright protection information cannot be read, DVD-Video contents cannot be reproduced. As a result, the copyright of the copy-protected DVD video can be protected.

[0006] For a recordable optical disk, conditions for specifying the light amount of a recording laser, the type of the disk, already-recorded information such as the name of a manufacturer, or address information for finding a specific position of a recordable guide groove, and the disk. The frequency information used for the control of the number of revolutions is previously recorded at a specific position.

[0007] The recording type optical disc is devised so that use (recording) can be started immediately after purchase. This can be performed by recording the above-mentioned recorded information and address information at a specific position on the disc as in the following (1) to (3). That is,

(1) The previously recorded information is recorded as embossed pits at the time of cutting the disc master, and the disc substrate is formed by using a metal matrix formed by the disc master, thereby obtaining the recording mold. Recording is performed at a specific position (such as a lead-in area of the disk) on the disk substrate of the optical disk. Further, if the recorded information is not recorded at the time of cutting the disc master,
At the time of shipment after the above-mentioned recordable optical disc is produced,
Using a recording device for recording the already recorded information, pits and marks are additionally recorded at the above-described specific positions.

(2) On the other hand, the address information is
The width of a specific part on one side of the guide groove is increased, and L
Recorded as PP. (3) Further, the frequency information described above indicates that the guide groove is LP
It is recorded as the frequency of the wobble slightly fluctuated in the radial direction in synchronization with P.

The recording of the recorded information, the address information, the frequency information, and the guide groove at a specific position on the disk substrate is specifically performed as follows.

First, a photosensitive resist is uniformly applied on a smooth polished glass disk to a thickness corresponding to the depth of the guide groove. If the recordable optical disk is a DVD-RW disk, the photosensitive resist is about 30 nm on a glass disk.
It is applied to a uniform thickness.

Next, the glass disk (resist disk) on which the photosensitive resist is uniformly applied is carried to a cutting device. The cutting device is equipped with a laser beam control device that changes a cutting laser beam emitted from a light source into intermittent light or slightly fluctuates in the radial direction (left and right). After the resist disc is mounted at a predetermined position of the cutting device, the recorded information, address information, and frequency information are recorded by irradiating the resist disc with intermittent light or a cutting laser beam that is slightly vibrated in the radial direction on the resist disc. Recorded at each specific location.

Here, two laser beams for cutting are used, one of the laser beams for cutting is used as continuous light to form a guide groove, and the other is intermittently formed to form an LPP. The previously recorded information is recorded as a pit at a specific position (such as a lead-in area) by changing the cutting laser beam forming the guide groove into intermittent light.

Thus, after cutting the resist board,
The resist disc is developed and the shape information is changed as the shape information (the previously recorded information, address information, frequency information, guide groove)
Precipitates. Then, a conductive thin film is coated on the developed resist disk, and the above-mentioned shape information on the resist disk is transferred onto the plating disk using electroplating. By processing the plating board to a desired size as a metal matrix, by using an injection molding machine equipped with a metal matrix, by transferring the shape information as a shape change on a plastic substrate,
A disk substrate of the recordable optical disk described above is obtained.

On the disk substrate, the place where the above-mentioned shape change is transferred is called an information surface, and a functional film for recording is formed on this information surface, and various post-processing is performed thereafter. And a recordable optical disk is created. By the way, in the disk substrate obtained by injection molding using the above-described metal matrix, the guide groove and the pit have the same optical depth (hereinafter, sometimes simply referred to as depth) over the entire disk substrate. .

As described above, since the guide groove of the recordable optical disk is formed at a depth required for tracking guide at the time of recording, an attempt is made to extract the signal from the record mark recorded at the time of reproduction to the maximum. Then, there is a problem that the reflectance is reduced due to the phase difference of the reflected light caused by the depth difference between the recording groove and the land. In land / groove recording such as that employed in DVD-RAM discs that can be repeatedly rewritten, the guide groove is allowed within a permissible range in order to reduce crosstalk between tracks between lands (between guide grooves) and grooves (guide grooves). In general, the depth of the guide groove is made shallower than the depth at which the guide signal from the guide groove is most efficiently extracted (取 り 出 wavelength of the reproduction wavelength). It is a target. The tracking operation to the guide groove is performed by the push-pull method.

On the other hand, a DVD-R which is a read-only disc
In the OM disk, the depth of the pits is set near the depth at which diffraction by laser light is efficiently performed so that a reproduction signal as large as possible is obtained (1/3 of the reproduction wavelength).
Around 4 wavelengths). For this reason, in the tracking operation, a signal necessary for tracking cannot be sufficiently obtained by the push-pull method for the pit row, so that the tracking is performed by the phase difference method.

As described above, the recording type optical disc DV
The guide groove depth is set so that the recording and reproducing operation can be performed efficiently in the D-RAM disk, and the pit depth convenient for reproduction is set in the DVD-ROM disk which is a read-only disk. .

The following two methods (1) and (2) are conceivable as methods for providing guide grooves and pits having different depths on the disk substrate of a single recordable optical disk.

(1) First, as shown in FIG. 4, when cutting the resist disc, an output of a cutting laser beam (laser A) for forming pits and guide grooves is used. By changing the output, one output forms a depth convenient for pit reproduction, and the other output forms a shallow groove convenient for recording a guide groove. However, in this cutting method, since the bottom surface of the shallower guide groove does not reach the glass master below the resist, the bottom surface of the guide groove is determined not by the glass master but by the output distribution of the laser A. Therefore, the shape of the bottom surface of the guide groove is not flat but funnel-shaped. Actually, the output distribution of the laser A becomes non-uniform with the beam center being the maximum, so that it is difficult to obtain uniformity of the bottom surface of the guide groove, and the signal characteristics of recording / reproducing greatly deteriorate. In FIG. 4, FIG.
In the following description, “LPP” indicates “land pre-pit” formed on a land, and laser B is a laser beam output for forming a land pre-pit.

(2) Next, as a second method, as shown in FIG. 6, when cutting the resist disc, a cutting laser beam (laser A) for forming pits and guide grooves, This is another method using a cutting laser beam (laser B) for forming land prepits. A pit and a guide groove having the same depth are formed by using a laser A having a constant output (the bottom surfaces of the pit and the guide groove reach the glass master below the resist). In addition, a method is used in which a resist adjacent to both ends of the guide groove is exposed to an arbitrary height using a laser B to adjust the relative depth of the guide groove. In this method, since the bottom surface of the guide groove is the surface of the glass master disk, the shape of the bottom surface of the guide groove is flat, so that the same recording / reproducing signal characteristics as those of a disc formed only by the conventional guide groove can be obtained. Can be.

However, in the second method, when the boundary between the pit row and the guide groove and the transition from the guide groove to the pit row is reproduced, the height of the resist between the two pit rows and the pit row Since the height of the resist is different between the guide grooves (or between the guide groove and the pit row), the pit signal and the land pre-pit at the portion where the pit row is switched from the pit row to the guide groove and from the guide groove to the pit row-pit row are switched. Signal loss or difference in amplitude occurs.

As described above, when one recording-type optical disk includes both a pit row having a depth convenient for reproduction and a guide groove having a depth convenient for recording and reproduction, In order to obtain sufficient recording / reproducing characteristics, it is desirable to design the glass master so that the bottom surface is flat and the bottom surface is flat. When a portion where the pit line is switched to the guide groove and a portion where the guide groove is switched to the pit line is reproduced, it is found that there is a recording device in which the pit signal is missing or the reproduction tracking is disturbed at the switched portion. The cause is that the signal of the pit row is affected by the adjustment of the resist thickness of the adjacent guide groove, so that the signal cannot be taken out properly, and the pit row and the guide groove are adjacent to each other. The signal information of all the pit rows was missing. The recording device in which the tracking is disturbed in this manner is configured such that the pit row is used for guiding grooves,
At the part where the guide groove changes from the guide groove to the pit row, the tracking control signal becomes an abnormal value and tracking is lost.
The playback track position shifts more than 0 tracks,
In some cases, recording and reproduction from a desired location became impossible.

As described above, in order to be able to obtain a sufficient reproduction signal by recording / reproducing in the guide groove and record information which cannot be rewritten in a pit row, in a single recordable optical disk, The groove depth of the groove and the pit depth of the pit row need to be the optimum depth, respectively, and the bottom surface of the guide groove and the bottom surface of the pit are both flat on the surface of the glass master, and both have good recording and reproduction characteristics. There has been a demand for a disc which is excellent and free from disturbance of lack of a land pre-pit signal at a portion where a pit and a guide groove are switched. In addition, an efficient address embedding method has been demanded.

Accordingly, the present invention provides a guide groove formed particularly on a disk substrate and one side (for example, a first side) of the guide groove.
The frequency signal and / or address signal recorded in
By changing the side of the guide groove for recording the frequency signal or the address signal depending on the area (for example, changing to a side other than the first side or to the second side), high-density recording and reproduction can be performed. It is possible to reliably protect the copyright, and to surely detect the position of the zone or layer.

Hereinafter, the information recording medium of the present invention will be described in detail with reference to the drawings. FIG. 1 is an enlarged sectional view for explaining a first embodiment of the information recording medium of the present invention, FIG. 2 is an enlarged sectional view for explaining a second embodiment of the information recording medium of the present invention, and FIG. FIG. 4 is an enlarged sectional view for explaining a third embodiment of the information recording medium of the present invention, FIG. 4 is a diagram for explaining an example of a cutting state of the information recording medium, and FIG. 5 is a lead-in area of the information recording medium of the present invention; FIG. 6 is a diagram for explaining another example of the cutting state of the information recording medium.

In the following description, an embodiment of the information recording medium of the present invention will be described based on the physical format of a DVD-RW. However, other recordable CD-RWs and DVs can be used.
It is needless to say that the present invention can be applied to D + RW and the like in which the data can be recorded on a plurality of recording layers and high-density optical discs such as next-generation DVDs.

Next, an embodiment of a disk format will be described. FIG. 1A shows a type 1 disk (information recording medium), and FIG. 1B shows a type 2 disk (information recording medium). Referring to FIG. Will be described.

A disc (information recording medium) described as type 1 in FIG. 1A has a recordable area (tracks of track numbers 1 and 2) in which lead-in information is recorded, and a read-only area (track number). 3 to track number 7) and a recordable area (tracks after track number 8). Lands on the first side adjacent to the tracks of track number 1 and track number 2 are land areas. Prepits LPP are recorded, and land prepits LPP are recorded on lands on the second side, which is the side opposite to the first side, adjacent to each track after track number 4.

A disc (information recording medium) described as type 2 in FIG. 1B has a recordable area (track of track number 1) in which lead-in information is recorded, and an intermediate area (track of track number 2). ), Playback-only area (tracks of track number 3 and track number 4), intermediate area (track of track number 5), playback-only area (tracks of track number 6 and track number 7), recordable area (track number 8 and thereafter) And land pre-pits LPP are recorded on the lands on the first side adjacent to the tracks after track number 5, and the tracks of track number 1 and track number 2 are Land pre-pits LPP are recorded on lands on the second side opposite to the adjacent first side. The type 2 intermediate area is an area having a pit whose depth changes between a track in the read-only area and a recordable area.

FIG. 5 shows the structure from the lead-in area (inner circumference direction) to the data area (outer circumference direction) of the disk in the embodiment of the present invention. In this area, the disc manufacturing method differs, and type 1 (hereinafter, type 1 and type 1 will be described as being the same) and type 2
(Hereinafter, type 2 and type 2 will be described as being the same) so that two types can coexist as a format. In this format, the signal performance (recording / reproducing characteristics) is not so good in type 1, but it is relatively easy to manufacture. In type 2, the signal performance (recording / reproducing characteristics) is preferable, but the signal performance in the intermediate region is low. The coexistence of the two methods that require restrictions can give the manufacturing method a degree of freedom.

The lead-in area of type (type) 1 is approximately λ from the inner circumference which is the (1-1) recordable / reproducible area.
A recording / reproducing area having land pre-pits LPP having information such as addresses in a land area on the side of a groove area having a depth of about / 12, and an initial zone where a tracking error signal of differential push-pull is obtained. , Systemrese
rved zone, buffer zone 0, RW
-Physical format informat
ion zone, Reference code z
one, buffer zone1, linking
Loss area, (1-2) A read-only area from which a DPD tracking error signal composed of prepits having a depth of about λ / 4 and having no land prepit LPP can be obtained and from which a recording signal can be read. Control with information on protection and lead-in information
data zone (Readable emboss
without LPP), (1-3) a reproduction-only area from which a DPD tracking error signal composed of prepits having a land prepit LPP and having a depth of about λ / 12 is obtained and from which a recording signal cannot be read out.
readable emboss zone with
LPP, (1-4) A recordable and reproducible area having land prepits LPP having information such as addresses in a land area on the outer peripheral side of the groove area, and a differential push-pull tracking error signal is obtained. The area is divided in the outer peripheral direction in the order of bufferzone2 and data area for recording the following user content. Here, the start address of each area is shown at the upper right of each area. t
The operation at the time of recording of type (type) 1 is represented by Wr on the left side of FIG.
item mode, and the operation at the time of reproduction is indicated by R on the left side of FIG.
This is indicated by an ead mode. "recording" indicates a recording operation, "reading" indicates a reproducing operation, "seek" indicates a seek operation, or an operation of skipping a track.
Ead gen wclk indicates an operation of reproducing a wobble signal and an LPP address to generate a recording clock signal and a recording timing signal.

Next, the lead-in area of type (type) 2 includes (2-1) information such as an address in a land area of a groove area having a depth of about λ / 12 from the inner circumference which is a recordable / reproducible area. Initial zone, system res, which is a recordable and reproducible area that has a land pre-pit LPP with a mark and can obtain a differential push-pull tracking error signal
preserved zone, buffer zone 0, R
W-physical format informa
Tion zone, buffer zone 1,
(2-2) boundary flag zone in which a code for determining whether the type is 1 or 2 is recorded.
e1 (may not be present), bo which is the intermediate area described above
unary emboss zone 1 (about λ / 12
A pit region formed so as to have a depth of about λ / 4 from a depth of about λ / 4, from which a tracking error signal and a DPD tracking error signal of a differential push-pull can be obtained. A read-only area from which a DPD tracking error signal composed of prepits having a depth of about 4 and having no land prepit LPP can be obtained and from which a recording signal can be read, and a control having information on copyright protection and lead-in information.
data zone (Readable emboss
(without LPP), (2-4) boundary flag zo in which a code for determining whether type (type) 1 or type (type) 2 is recorded is recorded.
ne2 (may be omitted), b being the intermediate region described above
ordinary emboss zone 2 (about λ / 1
A pit region formed so as to have a depth of about λ / 4 from a depth of about 2 to obtain a differential push-pull tracking error signal and a DPD tracking error signal.) (2-5) about λ Unrea, which is a read-only area from which a DPD tracking error signal composed of prepits having a land prepit LPP having a depth of about / 12 and from which a recording signal cannot be read is obtained.
double emboss zone with LP
P, (2-6) is a recordable / reproducible area which has a land prepit LPP having information such as an address in a land area on the outer peripheral side of a groove area having a depth of about λ / 12 and is capable of recording / reproducing. The area is divided in the outer circumferential direction in the order of buffer zone 2 in which a push-pull tracking error signal is obtained, and data area in which user content is recorded. Here, the start address of each area is shown at the upper right of each area. type
The operation at the time of recording of (type) 2 is shown in the right side of FIG.
Mode and the operation at the time of reproduction is shown on the right side of FIG.
Mode. “recording” indicates a recording operation, “reading” indicates a reproducing operation, “seek” indicates a seek operation, or an operation of skipping a track.
d gen wclk indicates an operation of reproducing a wobble signal and an LPP address to generate a recording clock signal and a recording timing signal.

Boundary flag zone 1
And boundary flagzone2 may not be in this position, but in some cases, boundary flagzone2
zone1 and boundary flag zone
2 is the disk type (type) 1 or type
Since the presence or absence differs depending on (type) 2, control data z having the above-described lead-in information
It is desirable that the information be embedded and recorded in advance together with the address information of one or the LPP in the recordable area so that the type (type) 1 or type (type) 2 of the disc to be recorded / reproduced can be determined.

Next, type (type) 1 and type
With reference to FIG. 1, a case where the area is commonly reproduced and a case where the area is recorded on a (type) 2 disc will be described. FIG. 1 is a diagram for simplifying the expression of the format of FIG. 5 as a track position and explaining mainly the physical contents for recording and reproduction.

FIG. 1 shows track numbers 1 to 9
5 corresponds to the groove area in which each track of type 1 track number 1 and track number 2 is wobbled at a predetermined frequency on both sides at a depth of about λ / 12. Land pre-pits LPP having information such as addresses in synchronization with a signal wobbled at a predetermined frequency in a land area on the outer peripheral side (first side) of
A recordable / reproducible information recording / reproducing area having (for example,
Initial zone, system re, in which a tracking error signal of differential push-pull is obtained.
served zone, bufferzone0, R
W-physical format informa
Tion zone, Reference code
zone, buffer zone1, linking
loss area. A track for track number 3 and track number 4 each having a depth of about λ / 4 and a DPD tracking error signal composed of prepits having no land prepits LPP is obtained, and a read-only recording signal is readable. Area Control
data zone (Readable embos
s with LPP). Each of track Nos. 5, 6, and 7 is wobbled at a predetermined frequency having a depth of about λ / 12 to the inner circumference side (the opposite side to the first side; A prepit having land prepits LPP having information such as an address in synchronization with the signal wobbled at the predetermined frequency is formed in a land area on the second side) side, and a DPD tracking error signal is obtained and recorded. Unread, a read-only area from which signals cannot be read
able emboss zone with LPP
It is. Tracks with track numbers 8, 9, and subsequent track numbers are differential push-pulls having land pre-pits LPP having information such as addresses in land areas on the outer peripheral side (first side) of the groove area. A recordable / reproducible information recording / reproducing area (Dataare) from which a tracking error signal is obtained.
a, for example, a second area that is an area other than the first area of the information recordable / reproducible area).

Next, the track of track number 1 of type 2 has a lead-in area on the inner circumference side of the groove area having a depth of about λ / 12 from the inner circumference which is the recordable / reproducible area (to the first side). Is a recordable / reproducible information recordable / reproducible area (for example, the information recordable / reproducible area having a land prepit LPP having information such as an address in a land area on the opposite side, the second side). Initial zone, system r in which the differential push-pull tracking error signal is obtained.
Reserved zone, buffer zone
0, RW-physical format info
emation zone, Reference co
de zone and the like. The track of track number 2 is the intermediate area, and is located on the inner circumferential side (the side opposite to the first side, the second side).
There is a land pre-pit LPP in the land on the side of (1). A read-only area in which each track of track number 3 and track number 4 has a depth of about λ / 4 and has a DPD tracking error signal composed of prepits having no land prepits LPP and from which a recording signal can be read. Control data zone (Readabl
e emboss withwith LPP). The track with track number 5 is the intermediate area, and the land pre-pits LPP are located on the lands on the outer peripheral side (first side). DPD tracking in which each track of track number 6 and track number 7 has a depth of about λ / 12 and has prepits having land prepits LPP on lands on the outer peripheral side (first side) of the groove area. Unreadable emboss zone, a read-only area from which an error signal is obtained and a recording signal cannot be read
with LPP. Each of the tracks of track number 8, track number 9, and subsequent track numbers is a land prepit LP having information such as an address in a land area on the outer peripheral side (first side) of the groove area.
This is a data recordable / reproducible area (Data area, for example, a second area other than the first area of the information recordable / reproducible area) from which a tracking error signal of a differential push-pull having P can be obtained. .

Here, the track of track number 2 will be described. In the case of the track of track number 2, if there is an LPP on the outer peripheral side (first side) of the track of track number 5 to track number 9, if the LPP is similarly arranged on the outer peripheral side (first side), the track number becomes The LPP will be located at a deep position between the tracks between the track No. 2 and the track number 3, and if the LPP signal is reproduced even if the LPP is formed as an information recording medium, the amplitude level and the offset level of the LPP signal will be reduced. This causes a problem that the LPP cannot be accurately detected in the track of track number 2 due to the fluctuation. Therefore, here, the LPP is set on the inner circumferential side (first
On the side opposite to the second side) and the normal LPP
By embedding the same LPP as the height of the track, it is easy to detect the LPP in the track of track number 2.

With such an arrangement, the inner peripheral side of the groove (the second side) is synchronized with the wobble signal wobble at a predetermined frequency.
In the case where the LPPs are arranged on the land portions on the outer side and the outer side (first side), the wobble signal and the LPP signal are generated from the push-pull signal of the detection signal from the pickup. The waveform is as shown in FIG.

FIG. 7 shows the type 1 shown in FIG.
1 shows a waveform reproducing a track of track number 8 and a waveform reproducing a track of track number 8 of type (type 2) 2 shown in FIG. Type (t
Both (type) 1 and type (type) 2 are reproduced waveforms when the same circuit configuration is used. Since the reproduction waveform generates the wobble signal and the LPP from the push-pull signal, the push-pull signal includes the LPP signals on both sides. Here, since the correct LPP signal is actually synchronized with the wobble signal, the correct LPP signal can be obtained by performing synchronous detection on the wobble signal.
Here, the groove goes out of the type (type) 1 and goes down in the type (type) 2. Therefore, when the necessary area is reached, the polarity of the wobble detection circuit or the LPP detection circuit is reached. The normal LPP signal can be obtained by changing the threshold value for comparison.

According to this method, a plurality of LPP signals are decoded to obtain address information, and the information of the current zone or layer (recording layer) is obtained from this information.
When the polarity of the LPP is different between one zone and two layers (recording layers), detecting the direction (polarity) has the advantage that the current position information on the disc can be obtained in a short time.

That is, in this case, in the case of the type (type) 1, the track number 1 and the track number 2 are on the lower side in each track, in the track number 5 to the track number 9 in the upper side, and in the type (type) 2 A normal LPP signal is output on the upper side of each of the track numbers 1 and 2 and on the lower side of each of the tracks of the track numbers 5 to 9.

When recording or reproduction is performed, it is necessary to determine the type (type) 1 or the type (type) 2. As a method of detecting the type (type) 1 or the type (type) 2, the control data zone having the above-described lead-in information is reproduced at the time when the disc is inserted and the start-up processing is performed, and the type (type) is recorded in this area. 1 or type (type
e) If 2 is recorded, determination is made based on this value. this is,
Reading can also be performed by a recording device or a reproducing device in a similar manner. In another example of the present embodiment,
dary flagzone1 and boundary
type (type) as LPP in flag zone2
e) Since information relating to 1 or type 2 is recorded, it is possible to determine type 1 and type 2 by reading this information at the time of recording. This method can be applied when recording is performed by a recording device. For this type of recording, any other method may be used as long as it can be detected in the state of a disc on which no recording has been performed.

Now, when recording the type (type) 1 in order from the track of track number 1 (Write Mode shown on the left side of FIG. 5), the tracks of track number 1, track number 2, track number 8, and track number 9 are respectively recorded. Is a track to be recorded, and there is a wobble frequency signal on both sides of the track as described above. By detecting this frequency signal and feeding back a speed signal for rotating the disk, the disk is rotated at a constant linear velocity. Performs control and generates a recording clock signal. Next, since the direction of the LPP is determined in advance, the LPP recorded on the land is detected by adjusting the direction of the detection circuit, and an address signal is generated.
Based on the detected timing signal, recording is performed at a predetermined linking timing of this track (recording, write,
Initial zone ~ Linking loss
area) is started. Then, the recording is stopped at the linking timing corresponding to the address corresponding to the track of track number 3, and the reproduction state (Write shown on the left side of FIG. 5)
Reading and Control in Mode
data zone (Readable emboss
without LPP)).

The track of track number 3 has a recording area composed of reproducible pits and has no wobble signal and LPP signal. However, an address is detected from the reproducible pits and a reproducing operation is performed based on the address (FIG. 5). W shown to the left of
reading, Cont in write mode
roll data zone (Readable em
(without LPP)) up to the track of track number 4. Next, the tracks of track number 5, track number 6, and track number 7 are signals for which pit signals cannot be reproduced. Since wobble signals and LPP signals are present in this area, wobble signals are reproduced during reproduction of these tracks. The LPP address is reproduced by switching the direction of the signal and the LPP detection circuit, and a recording clock and a recording timing are generated (Write Mode shown on the left side of FIG. 5).
Reading genwclk, Unrea
In the same manner, recording is started at the linking timing on the tracks with track numbers 8 and thereafter, and the subsequent recording processing (record in the Write Mode shown on the left side of FIG. 5).
rding, buffer zone2-Data a
rea).

Here, in the type (type) 1, both sides of the track are symmetric on both sides, and the boundary between the track number 2 and the track number 3, the track number 4 and the track number 5, and the track number 7 and the track number 8 The tracking error signal by the differential push-pull can be continuously obtained with a certain amplitude difference. As described above, since the boundary of the pit area can be continuously recorded, an RF signal can be continuously obtained at the time of reproduction. Processing during playback (Read shown on the left side of FIG. 5)
Mode) calculates the tracking error by the phase difference method (DP).
D) (differential push-pull may be used), and sequentially reproduce tracks from track number 1 to track number 9 (reading, initial zone to C in Read Mode shown on the left side of FIG. 5).
control data zone (Readable
emboss without LPP)). At this time, since the signals of track number 5, track number 6, and track number 7 cannot be reproduced, the signals are skipped (seek, Unreadable emboss in Read Mode shown on the left side of FIG. 5).
with LPP to buffer zone 2), and then successively reproduce tracks with track numbers 8 and thereafter. (Read Mod shown on the left side of FIG. 5)
e, reading, Data area)

Next, when recording type 2 (type) in order from the track of track number 1, each of the track numbers 1, 8, and 9 is a track to be recorded. The track of track number 2 which is an intermediate area is a recordable track in type (type) 1, whereas the track of track number 2 is a recordable track in type (type) 2.
The reason why the track is a pit track is that, in the track of track number 2, the lands on both sides of the track have different depths, and even if the wobble signal and the LPP signal necessary for recording are recorded, At such a signal amplitude or signal offset level, a signal cannot be obtained, and a recording clock or a timing signal cannot be accurately obtained.

Similarly, in the type 2 disk, the track of track number 5 which is an intermediate area is also
The lands on both sides of the track have different depths, and even if the wobble signal and the LPP signal necessary for recording are recorded, the signal can be obtained with the signal amplitude and the signal offset level as in the previous track. Since the recording clock and the timing signal cannot be accurately obtained because the recording cannot be performed, the recording clock and the timing signal are accurately obtained on the track having the track number 6 or later.

The recording process is performed in order (Writ shown in the right side of FIG. 5).
e Mode) will be described. In the track of track number 1, there is a wobble frequency signal on both sides of the track as described above, and the speed signal for rotating the disk is detected by detecting this frequency signal and the disk is controlled at a constant linear velocity. And a recording clock signal is generated. Next, the direction recorded on the land is set, the LPP is detected, an address signal is generated, and recording is performed at a predetermined linking timing of this track based on the detected timing signal (Write shown in the right side of FIG. 5). Recording in the Mode, initial zone
Start the boundary flag zone 1).

Then, the recording is stopped at the linking timing at which the address corresponds to the track of track number 2, and the reproduction state is set. The track of track number 2 is skipped because the recording area is composed of unreproducible or reproducible pits (Write M shown on the right side of FIG. 5).
The dashed line of recording in the mode, bou
ndary flag zone 2).

The track of track number 3 is composed of reproducible pits in the recording area and has no wobble signal and LPP signal.
Playback is performed up to the track of track number 4 based on the address (reading and control data zone in Write Mode shown on the right side of FIG. 5).
e (Readable emboss withwithout
LPP) ~ boundary flag zone
2).

Next, the track of track number 5 is skipped because the pit signal cannot be reproduced and the wobble signal and the LPP signal cannot be reproduced accurately. Next, the tracks of track number 5, track number 6, and track number 7 cannot reproduce the pit signal. Since the wobble signal and the LPP signal are present in this area, the wobble signal is The direction is switched to reproduce the LPP address, and a recording clock and a recording timing are generated (Write shown in the right side of FIG. 5).
Reading gen wcl in Mode
k, Unreadable emboss with
LPP), recording is similarly started at the linking timing on tracks having track numbers of track numbers 8 and thereafter, and subsequent recording processing is performed (Write Mod shown on the right side of FIG. 5).
e, recording, buffer zone
e2-Data area).

Here, in the type (type 2), the tracks of track number 2 and track number 5 in which both sides of the track are intermediate areas are also asymmetrical, and the track at this boundary has a push-pull tracking error signal. However, recording or reproduction cannot be performed accurately due to a difference in amplitude or an offset, but a tracking error signal by the differential push-pull method can be continuously obtained within a range where the difference in amplitude is acceptable to some extent. By arranging such an area, the boundary of the pit area can be continuously recorded, so that the RF signal can be continuously obtained at the time of reproduction. (Differential push-pull may be used), and tracks from track number 1 to track number 9 are sequentially reproduced. then,
In type 2, the tracks of track number 2, track number 5, track number 6, and track number 7 cannot be read because the signal cannot be reproduced.
seek, Initial in the ead mode
zone ~ boundary emboss zone
1, boundary flag zone 2-b
buffer zone 2), track number 3, track number 4, and track numbers 8 and subsequent tracks are continuously reproduced (reading, Co in ReadMode shown on the right side of FIG. 5).
control data zone (Readable
emboss without LPP) ~ bound
ary flag zone 2, Data are
a).

If two types (type) of type 1 and type 2 cannot be correctly detected, for example, if type 2 is changed to type 1 The present invention is also effective when the type (type) 2 is detected as the type (type) 1. In other words, in this case, in the case of recording, the recording apparatus attempts to perform recording on the track with track number 2, but on the track with track number 2, the LPP and wobble cannot be detected accurately, so recording is stopped halfway. . Even if all the tracks of track number 2 have been recorded, a tracking error signal can be obtained from this area during this reproduction, so that the reproduction signal from the track of track number 2 cannot be read, but there is no problem. Continuous playback is possible. Track number 5
There is a possibility that the LPP signal cannot be read from the track No., but since it is read from the next track, recording and reproduction can be performed without any problem.

With such a configuration, the LPP signal in the boundary area can be reproduced more reliably, two different manufacturing methods of type 1 and type 2 are allowed, and a tracking error signal is generated during recording and reproduction. Can be continuously obtained without interruption of recording and reproduction.
-To increase the added value of the DVD-RW without affecting the ROM, the DVD video reproducing device and the like.

When an area is divided by reversing the position of an address signal such as LPP in one recording plane,
Since there is a case where the signal of the track at the boundary cannot be recorded well, pre-pit data is embedded in the track at the boundary in advance as pre-pits.

As a result, a continuous reproduced signal without any loss during reproduction can be obtained. At this time, the frequency signal of the wobble can be continuously arranged as before even if the address is reversed, and the continuous signal of the disk and the clock signal for recording can be continuously obtained.

Next, a second embodiment will be described with reference to FIG. Here, the description of the same parts as those described above is omitted. FIG. 2 shows a case where a recording area (recording layer) of a medium readable from one side, which is generally used for DVDs and the like, has two layers. It goes without saying that three or more recording layers may be used. FIG. 2A shows a two-layer parallel disk generally called a DVD or the like, and the address and the direction of the spiral groove are the same for both layers. In this case, the direction of the LPP is on the right side of the two layers with respect to the groove. That is, assuming that the spiral track is cut in the direction of the track of track number 9 with the track of track number 1 as the inner circumferential side, there is an LPP outside in the traveling direction.

FIG. 2B shows a first example of a two-layer opposite disk generally called for a DVD or the like.
The address is carved in the opposite direction in one layer, and the direction of the spiral groove is also one layer from the inner circumference to the outer circumference, and two layers from the outer circumference to the inner circumference. In this case, the direction of the LPP is one layer with respect to the groove. Is outside and in two layers is inside. Compared to the disc of FIG. 2A, the recording layer (in FIG. 2B, the upper recording layer is the first layer area of the information recordable area, and the lower recording layer is the first layer of the information recordable area. In each layer area other than the area (or between the layer areas (or the second layer area)), the side of the guide groove for recording the frequency signal / address signal is switched. That is, the LPP exists outside the track traveling direction in both the first layer and the second layer. By adopting such a configuration, since the polarity of the LPP is different, it is possible to determine which layer is currently present before detecting the address of the LPP when it is difficult to determine which layer the focus control has been performed. .

FIG. 2C shows a second example of a two-layer opposite disc generally called for a DVD or the like.
The address is engraved in the opposite direction in one layer, and the direction of the spiral groove is also one layer from the inner circumference to the outer circumference, two layers from the outer circumference to the inner circumference, and the direction of the LPP with respect to the groove is one track. Outside the traveling direction, even two layers are outside. That is, in the first layer, the LPP is outside the traveling direction, and in the second layer, the LPP is inside the traveling direction. FIG. 2 (a)
2C, the upper recording layer in FIG. 2 (c) is a first layer area of the information recordable area, and the lower recording layer is a layer area other than the first layer area of the information recordable area. In each layer area (between the second layer area and the second layer area), the side of the guide groove for recording the frequency signal and the address signal is switched with respect to the traveling direction of the track.
With such a configuration, although the direction in which the LPP exists differs from the traveling direction, the advantage of not having to switch the polarity of the LPP when reproducing the LPP signal and the advantage of cutting the medium can be obtained. There is a merit that switching of polarity is unnecessary. When the number of layers is large, there is a method of switching the direction of LPP between even and odd layers.

Next, as a third embodiment, when the information recordable area is divided by zones in FIG.
The case where the direction of the LPP is changed in the same manner as described above depending on the zone is shown. FIG. 3A shows each of the track numbers 1, 2, and 3 having an LPP on the inner side and each of the track numbers 4, 5, and 6 having an LPP on the outer side. One zone (for example, the first area of the information recordable area) is formed with the track, the track of track number 7 is a boundary area, and the cycle of the tracks of track numbers 1 to 7 is set to Repeat on the track with the track number. The same applies to the case where the data is divided not as a zone but simply as an information recordable area,
In the case where information with different properties is to be recorded on one medium, if addresses are formed in this way,
Since it is necessary to switch the detection polarity of the LPP depending on the address, there is no possibility of mistaken recording.
Fail safe is possible.

Next, FIG. 3B shows a case where the direction of the LPP in the information recordable area is changed in the same manner as described above, based on the information regarding copyright protection. FIG. 3B shows the tracks (for example, the first area of the information recordable area) of the track number 1, the track number 2, the track number 3, and the track number 4 having the LPP on the inner side and the track direction. The track is formed from a track having a track number 5 or later with an LPP on the outside (for example, a second area other than the first area of the information recordable area).

The direction of the LPP with respect to this position is determined by information on copyright protection. For example, when trying to record a content protected by copyright for authoring purposes, if information on copyright protection is obtained, LP based on this information is used.
A direction signal for the position of P is obtained, and it is possible to detect and record an address by switching the direction signal. On the other hand, if information on copyright protection is not available, LPP
Since the direction with respect to the position is not known, the address cannot be detected and accurate recording cannot be performed. For example, as a method of obtaining information on copyright protection, at the stage when the medium is inserted into a recording device, a unique ID of the medium is used.
Get. This ID is transferred to the distribution destination of the content to be recorded. As a result, when permission to distribute the content is given, the content information is obtained in advance together with the address switching information corresponding to the ID. Based on the address switching information, the correct address is detected. Record content. According to this method, the recording apparatus cannot know the address arrangement information and cannot detect even the address without permission from the outside, so that highly accurate copy protection is possible. If information on the copyright protection is not obtained from the outside in this way, the information on the medium can be known, but if the physical information such as the address and timing information on the recording cannot be known, a highly accurate copy can be obtained. Protection is possible.

Although the above embodiment has been described with respect to only the case where an LPP address is formed on one side of the groove which is a recording area, the present invention employs a wobble signal used as a frequency signal of the recording area. In the case where the signal exists on one side or the frequency signal or the address signal is on one side of the groove or in the case of land / groove recording, if the structure is located on one side of the groove, all the ranges are naturally within this range. is there. Further, the present invention is not limited to the manufacturing method, the correction format, the disk structure, and the like in the present embodiment.

[0065]

According to the present invention, when a wobble signal used as a frequency signal of a recording area is present on one side in a groove which is a recording area, or when an address signal is present on one side of the groove as one side, The recording area is changed by changing the direction of the frequency signal or the address signal in the case where there is a discontinuous area, in the case of a plurality of layers, when the area is divided, or when there is an area related to copyright information. It can be used effectively, and the layer and the region can be accurately determined, and this management can be performed by, for example, one inverting circuit.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an embodiment of an information recording medium according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an embodiment of an information recording medium according to a second embodiment of the present invention.

FIG. 3 is a diagram for explaining an embodiment of an information recording medium according to a third embodiment of the present invention.

FIG. 4 is a diagram for explaining an example of a cutting state of the information recording medium.

FIG. 5 is a diagram for explaining a lead-in area and a data area of the information recording medium of the present invention.

FIG. 6 is a diagram for explaining another example of the cutting state of the information recording medium.

FIG. 7 is a diagram for explaining a positional relationship between a wobble and a waveform of an LPP signal according to the present invention.

[Explanation of symbols]

 LPP Land pre-pits 1-9 Track number

Claims (9)

[Claims] 1. An information recording medium formed from a spiral or concentric information track and having an information recordable area, comprising: a recordable area in which a guide groove is formed in the information track; In the first area, a frequency signal and / or an address signal are recorded on the first side of the guide groove. In an area other than the first area of the information recording area, the frequency signal and / or the address signal are recorded. An information recording medium, wherein an address signal is recorded on a side of the guide groove opposite to the first side. 2. An information recording medium formed from a spiral information track and having an information recordable area, comprising: a recordable area in which a guide groove is formed in the information track; In the area, a frequency signal and / or an address signal are recorded outside the guide groove with respect to the traveling direction of the recording track when performing recording or reproduction, and in an area other than the first area of the recordable area. Is
An information recording medium, wherein the frequency signal and / or the address signal are recorded inside a traveling direction of the recording track when performing recording or reproduction. 3. An information recording medium formed from a spiral or concentric information track and having a plurality of layers of information recordable areas, wherein the information track has a recordable area in which a guide groove is formed. In a first layer area of the recording area, a frequency signal and / or an address signal is recorded on a first side of the guide groove. In a layer area of the information recording area other than the first layer area, An information recording medium, wherein the frequency signal and / or the address signal are recorded on a side of the guide groove opposite to the first side. 4. An information recording medium formed from a spiral information track and having a plurality of layers of information recordable areas, wherein the information track has a recordable area in which a guide groove is formed. In the first layer area, a frequency signal and / or an address signal are recorded outside the guide groove with respect to the traveling direction of the recording track when performing recording or reproduction, and the first layer area of the recordable area An information recording medium characterized in that the frequency signal and / or the address signal are recorded inside a traveling direction of the recording track when performing recording or reproduction in a layer area other than the above. 5. The information recording medium according to claim 1, wherein the position of the frequency signal and / or the address signal is switched according to the position of a zone in the recordable area. 6. The information recording medium according to claim 1, wherein the position of the frequency signal and / or the address signal is switched according to information related to copyright protection. 7. The information recording medium according to claim 1, wherein the position of the frequency signal and / or the address signal is switched depending on a direction of a spiral of the recording layer. 8. The frequency signal and / or address information recorded on the information recording medium according to claim 1, wherein the information is formed from a spiral or concentric information track and has an information recordable area. An identification step of reproducing identification information identified from information on the information recording medium; a detection step of detecting the frequency signal and / or the address based on an identification result of the identification step; and the frequency signal detected in the detection step And / or a recording / reproducing step of performing recording / reproducing based on an address. 9. The information on the frequency signal and / or address position recorded on the information recording medium according to claim 1, wherein the information is formed from a spiral or concentric information track and has an information recordable area. A first detection step of detecting with a threshold, a determination step of determining the polarity of the frequency signal and / or the information on the address position detected in the first detection step, and a determination result of the determination step; A changing step of changing a threshold for detecting a frequency signal and / or an address; a second detecting step of detecting the frequency signal and / or an address; and the frequency signal and / or the address detected in the second detecting step. A recording / reproducing step of performing recording / reproduction based on the information. Method.