JP2002092890A - Information recording medium, recording method of information recording medium and reproducing method of information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium in which excellent reproduction information from pit rows for reproduction only and also excellent reproduction information from guiding grooves for recording and reproduction can be both obtained by reproducing an intermediate region composed of the pit row by a tracking system of a differential push-pull system or a phase difference system, further optimum tracking characteristic can be always obtained even in an unrecorded region and optimum tracking characteristic can be always obtained even in a recorded region. SOLUTION: In the information recording medium, bottom surface positions of the guiding groove and the pit row formed on a disk substrate are located on the same plane and both are even and the intermediate region composed of the pit row, height of which changes between height from the bottom surface to a flank of the guiding groove and height from the bottom surface to a flank of the pit row, is provided at a change-over part where the pit row changes to the guiding groove or the guiding groove changes to the pit row.

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 a reproduction-only area (area in which a pit row is formed), and address information of the recording / reproducing area includes a land (guide groove). For example, a DV formed as a land pre-pit (hereinafter referred to as “LPP”)
The present invention relates to a recordable and reproducible information recording medium such as D-RW, a method for recording an information recording medium, and a method for reproducing an information recording medium.

[0002]

2. Description of the Related Art In general, a high-density recording type optical disk such as a DVD-RW which can be recorded a plurality of times with compatibility with a DVD video (hereinafter sometimes simply referred to as a recording type optical disk).
In, the content protected by copyright must be distinguished from the content not protected by copyright, so that illegal copying (recording and reproduction) of the content must not be 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 a DV.
When the content is reproduced by a D-video reproducing device, there is a possibility that information related to copyright protection may be read out, so that copy-protected DVD-Video contents can be reproduced. It has a problem that it cannot be sufficiently protected.

[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 comprising a read-only area and an information recordable area. A recordable area in which a guide groove is formed in the information track, a first read-only area in which a first pit row is formed, and a second read-only area in which a second pit row is formed; An intermediate area having a third pit row formed between the first read-only area and the second read-only area; a bottom surface of the first pit row and the second pit; The bottom of the row and the third pit row are on the same plane, and the third pit row in the intermediate area has an optical depth on the side of the first read-only area and the second read-only area. It is noted that it was formed so that the optical depth on the region side was different. To provide information recording medium with. According to another aspect of the present invention, there is provided an information recording medium formed from a spiral or concentric information track and having a read-only area and an information recordable area, wherein a guide groove is provided on the information track. Is formed, a read-only area in which a first pit row is formed, and an intermediate area having a second pit row formed between the recordable area and the read-only area. Wherein the bottom surface of the guide groove, the bottom surface of the first pit row, and the bottom surface of the second pit row are on the same plane, and the second pit row in the intermediate area is the recordable area The optical depth of the side,
An information recording medium is provided which is formed so as to have a different optical depth from the read-only area. According to another aspect of the present invention, there is provided an information recording medium formed of a spiral or concentric information track and comprising a read-only area and an information recordable area, wherein a guide groove is provided on the information track. Is formed, a first read-only area in which a first pit row is formed, a second read-only area in which a second pit row is formed, the recordable area and the second read-only area. A first intermediate area having a third pit row formed between the first intermediate area and the first read-only area;
A second intermediate area having a fourth pit row formed between the first read-only area and the second read-only area, a bottom surface of the guide groove, the first pit The bottom of the row, the bottom of the second pit row, the bottom of the third pit row, and the bottom of the fourth pit row are on the same plane, and the third pit row in the first intermediate region Is different from the optical depth on the recordable area side and the optical depth on the first read-only area side, and the fourth pit row in the second intermediate area is the optical depth on the first read-only area side. An information recording medium characterized in that the target depth is different from the optical depth on the second read-only area side. According to another aspect of the present invention, there is provided an information recording medium formed of a spiral or concentric information track and comprising a read-only area and an information recordable area, wherein a guide groove is provided on the information track. Is formed, a first read-only area in which a first pit row is formed, a second read-only area in which a second pit row is formed, and a third pit row is formed. A third read-only area, a first intermediate area having a fourth pit row formed between the first read-only area and the second read-only area, and a second read-only area. A second intermediate area having a fifth pit row formed between the read-only area and the third read-only area, a bottom surface of the guide groove, a bottom surface of the first pit row, The second
The bottom of the pit row, the bottom of the third pit row, and the bottom of the fourth pit row are on the same plane;
In the fourth pit row in the middle area of the second area, the optical depth on the side of the first read-only area and the optical depth on the side of the second read-only area are different, and the fifth pit row of the second The pit row has an optical depth on the side of the second read-only area and the third
An information recording medium characterized in that the optical recording medium has a different optical depth from the read-only area. According to another aspect of the present invention, there is provided an information recording medium according to any one of claims 1 to 4, and at least one of the intermediate area, the first intermediate area, and the second intermediate area. An information recording medium that does not have the information recording medium and reproducing the identification information by identifying the information on the information recording medium, and the identification result of the identification information reproducing step, the intermediate area, the first When it is determined that there is no intermediate area or at least one of the second intermediate areas, an area corresponding to at least one of the intermediate area, the first intermediate area, and the second intermediate area is recorded. When it is determined that there is at least one of the intermediate area, the first intermediate area, and the second intermediate area, To provide a recording method of the first intermediate region or the information recording medium characterized by comprising a reproduction step of reproducing at least one of said second intermediate region. Also,
In order to solve the above-mentioned problems, the present invention provides an information recording medium according to any one of claims 1 to 4, the intermediate area, and the first area.
An information recording medium that does not have at least one of the intermediate area and the second intermediate area from information on the information recording medium and reproduces identification information; When it is determined from the identification result of the step that there is no at least one of the intermediate area, the first intermediate area, and the second intermediate area, the intermediate area, the first intermediate area, or the second 2. An information recording method, comprising: an intermediate area reproducing step of reproducing at least one area corresponding to the intermediate area No. 2; and a step of skipping the intermediate area reproducing step when it is determined that the intermediate area exists. A method for reproducing a medium is provided. Further, in order to solve the above-mentioned problems, the present invention is formed from a spiral or concentric information track, and has a first depth in which a frequency signal and an address signal are recorded in advance from the inner circumference of the information track. , An information recordable area, a reproduction signal is recorded as a pit row, a first reproduction-only area at a first optical depth in which a frequency signal and an address signal are recorded in advance, and a reproduction signal is recorded as a pit row. Between the second read-only area having the second optical depth and the information recordable area having the first optical depth and the second read-only area having the second optical depth. A first intermediate area of an optical depth between the first optical depth and the second optical depth where a reproduced signal is recorded as a pit row; and the second optical depth. Second
Between the first optical depth and the second optical depth in which a reproduced signal is recorded as a pit row between the read-only area of the first and the first read-only area of the first optical depth. And a second intermediate region having an optical depth between the two. Further, in order to solve the above-mentioned problems, the present invention is formed from a spiral or concentric information track, and has a first depth in which a frequency signal and an address signal are recorded in advance from the inner circumference of the information track. , An information recordable area, a second reproduction-only area having a second depth in which a reproduction signal is recorded as a pit row, and a reproduction signal are recorded as a pit row, and a frequency signal and an address signal are recorded in advance. A first structure having a first read-only area having a first depth, and a spiral or concentric information track are formed, and a frequency signal and an address signal are recorded in advance from the inner circumference of the information track. An information recordable area having a first optical depth, a first read-only area having a first optical depth in which a reproduction signal is recorded as a pit row and a frequency signal and an address signal are recorded in advance, Playback No. and second optical depth of the second reproduction-only area recorded as a pit train,
A first optical depth between the information recordable area of the first optical depth and a second read-only area of the second optical depth, where a reproduced signal is recorded as a pit row; A first intermediate region having an optical depth between the second optical depth, a read-only region having the second optical depth, and a read-only region having the first optical depth. A second structure having a second intermediate region of an optical depth between the first optical depth and the second optical depth between which the reproduced signal is recorded as a pit, An information recording medium having an area for recording information for identifying the first structure and the second structure is provided. According to another aspect of the present invention, there is provided a first information recording apparatus comprising a spiral or concentric information track, and a frequency signal and an address signal recorded in advance from an inner circumference of the information track. A possible area, a second information recordable area in which a frequency signal and an address signal are recorded in advance, and a first read-only area in which a read signal is recorded as a readable pit string and no address signal is recorded. As a pit string from which a reproduction signal cannot be read, a pit string is provided between a second reproduction-only area in which a frequency signal and an address signal are recorded in advance, and the first information recordable area and the first reproduction-only area. A read signal is recorded as a pit string between a first intermediate area that is an information recordable or read-only area and the first read-only area and the second read-only area. To provide an information recording medium and a second intermediate region which is. According to another aspect of the present invention, there is provided a first information recording apparatus comprising a spiral or concentric information track, and a frequency signal and an address signal recorded in advance from an inner circumference of the information track. A possible area, a first read-only area in which a reproduction signal is recorded as a readable pit string and no address signal is recorded, and a frequency signal and an address signal are recorded in advance as a pit string from which a reproduction signal cannot be read. A first structure having a second read-only area, a second information recordable area in which a frequency signal and an address signal are recorded in advance, and a spiral or concentric information track. A first information recordable area in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track, and a frequency signal and an address signal are recorded in advance. A second information recordable area, a reproduction signal is recorded as a readable pit row, a first read-only area in which an address signal is not recorded, and a reproduction signal is recorded as a pit string from which a read signal cannot be read. A second read-only area in which a signal and an address signal are recorded, and a first intermediate between the first information recordable area and the first read-only area, which is an information recordable or read-only area. A second structure including an area, a second intermediate area between the first read-only area and the second read-only area, and in which a read signal is recorded as a pit string; and the first structure. An information recording medium having an area for recording information for identifying the second structure. According to another aspect of the present invention, there is provided a first information recording apparatus comprising a spiral or concentric information track, and a frequency signal and an address signal recorded in advance from an inner circumference of the information track. A possible area, a second information recordable area in which a frequency signal and an address signal are recorded in advance, and a first read-only area in which a read signal is recorded as a readable pit string and no address signal is recorded. A second read-only area in which a reproduction signal is recorded as a pit that cannot be read and a frequency signal and an address signal are recorded in advance, the first information recordable area and the first read-only area. A first intermediate area in which a frequency signal and an address signal are recorded in advance, the first reproduction-only area, and the second reproduction area. A first structure having a second intermediate area in which a reproduction signal is recorded in pits between the data area and a frequency signal and an address signal, and a spiral or concentric information track. A first information recordable area in which a frequency signal and an address signal are recorded in advance from an inner circumference of the information track, a second information recordable area in which a frequency signal and an address signal are recorded in advance, A first read-only area in which an address signal recorded as a pit in which a signal can be read is not recorded,
There is a second read-only area in which a frequency signal and an address signal are recorded in advance as pits in which a read signal cannot be read and a frequency signal and an address signal are previously recorded, and the first information-recordable area and the first read-only area. , A first intermediate area that is a reproduction-only area, and a second intermediate area between the first reproduction-only area and the second reproduction-only area, in which a reproduction signal is recorded as a pit string. An information recording medium having the second structure is provided. According to another aspect of the present invention, there is provided a first information recording apparatus comprising a spiral or concentric information track, and a frequency signal and an address signal recorded in advance from an inner circumference of the information track. An available area, a second information recordable area in which a frequency signal and an address signal are recorded in advance, and a first read-only area in which a frequency signal recorded as a pit string from which a reproduced signal is readable is recorded. A second read-only area in which a frequency signal and an address signal are recorded in advance as a pit string from which a read signal cannot be read, and a first read-only area between the second information-recordable area and the first read-only area. A first intermediate area, which is an information recordable or read-only area, and a read signal between the first read-only area and the second read-only area as a pit train. It is recorded in advance frequency signal to provide an information recording medium and a second intermediate region being recorded. According to another aspect of the present invention, an information recording medium having the intermediate area and an information recording medium not having the intermediate area according to claims 13 to 19 are provided. An identification information reproducing step of reproducing the identification information by identifying the information from the information on the recording medium; and when it is determined that the intermediate area does not exist, based on the identification result of the identification information reproducing step, an area corresponding to the intermediate area is recorded. And a reproducing step for reproducing the intermediate area when it is determined that the intermediate area is present. Further, the present invention solves the above-mentioned problems by using claims 13 to 1.
9. An identification information reproducing step of reproducing an identification information by identifying an information recording medium having the intermediate area and an information recording medium not having the intermediate area from information on the information recording medium, When it is determined by the identification result of the identification information reproducing step that the intermediate area does not exist, an intermediate area reproducing step of reproducing an area corresponding to the intermediate area; and when it is determined that the intermediate area exists, the intermediate area reproducing step And a step of skipping steps. Also,
In order to solve the above-mentioned problems, the present invention provides a first information recordable area which is formed from a spiral or concentric information track, and from which a frequency signal and an address signal are recorded in advance from the inner circumference of the information track. A second information recordable area in which a frequency signal and an address signal are recorded in advance,
A first read-only area in which a frequency signal recorded as a pit from which a reproduction signal is readable is recorded, and a first reproduction-only area in which a reproduction signal is recorded as an unreadable pit, and a frequency signal and an address signal are recorded in advance. 2 is a read-only area, located between the first information recordable area and the first read-only area, and is an information recordable area;
A reproduction signal is recorded as a pit at least between a first intermediate area in which a frequency signal is recorded in advance and the first reproduction-only area and the second reproduction-only area, and at least a frequency signal is recorded in advance. And an information recording medium having a second intermediate area. According to another aspect of the present invention, there is provided a first information recording apparatus comprising a spiral or concentric information track, and a frequency signal and an address signal recorded in advance from an inner circumference of the information track. An available area, a second information recordable area in which a frequency signal and an address signal are recorded in advance, a first read-only area in which a reproduced signal is recorded as readable pits, and an address signal is not recorded, A reproduction signal is recorded as a pit that cannot be read, and a second reproduction-only area in which a frequency signal and an address signal are recorded in advance, and the reproduction signal is located between the first reproduction-only area and the second reproduction-only area. The signal is recorded as a pit,
An information recordable area between a first intermediate area in which a frequency signal and an address signal are recorded in advance, and the first information recordable area and the first read-only area;
A first structure including a second intermediate area in which a frequency signal and an address signal are recorded in advance, and a spiral or concentric information track, and the frequency signal and the address signal are previously determined from the inner circumference of the information track. The first information recordable area in which a frequency signal and an address signal are recorded in advance; and the second information recordable area in which a frequency signal and an address signal are recorded in advance.
The first read-only area in which a reproduction signal is recorded as readable pits and a frequency signal is recorded, and the first reproduction-only area in which a frequency signal and an address signal are recorded in advance as pits from which a reproduction signal is not readable. A second read-only area, and a third intermediate area between the first information-recordable area and the first read-only area, which is an information-recordable area and at least a frequency signal is recorded in advance. A second structure including a fourth intermediate area between the first reproduction-only area and the second reproduction-only area, in which a reproduction signal is recorded as a pit and at least a frequency signal is recorded in advance; An information recording medium having the same is provided. Further, in order to solve the above-mentioned problem, the present invention is formed from a spiral or concentric information track, and a frequency signal and an address signal are recorded in advance from an inner periphery of the information track, and a tracking error within a predetermined range is obtained. A first information recordable area where a signal is obtained, a second information recordable area where a frequency signal and an address signal are recorded in advance and a tracking error signal in a predetermined range is obtained,
A first read-only area in which a frequency signal recorded as a pit from which a reproduction signal is readable is recorded to obtain a tracking error signal in a predetermined range; and a pit from which a reproduction signal is not readable, And a second read-only area in which an address signal is recorded and a tracking error signal in a predetermined range is obtained.
In the area near the boundary between the information recordable area and the first read-only area and the area near the boundary between the first read-only area and the second read-only area, And an area from which a tracking error signal is obtained outside the range. In order to solve the above-mentioned problems, the present invention provides an identification step for reproducing identification information for identifying an information recording medium having the structure according to claim 29 from information on the information recording medium; Judging, from address information, an area where a tracking error signal in the predetermined range corresponding to the structure identified by the structure is obtained, and an area where a tracking error signal outside the predetermined range is obtained from the address information; And a recording step of performing a recording process by changing a tracking control method. Further, in order to solve the above-mentioned problems, the present invention provides an identification step of reproducing identification information for identifying an information recording medium having a structure according to claim 29 from information on the information recording medium, Determining from the address information an area in which a tracking error signal in the predetermined range corresponding to the structure identified by the identification step is obtained, and an area in which a tracking error signal outside the predetermined range is obtained, In the area (1), there is provided a reproducing method of an information recording medium, comprising a reproducing step of performing a reproducing process by changing a reproducing control method.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a recordable disc such as a DVD-RW, a predetermined area (an information area related to copyright protection) of a disc in which information related to copyright protection of DVD video is recorded in a normal state. Then, record information on copyright protection information with embossed pre-pits,
The copyright protection information is processed so that it 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, it is possible to protect the copyright of the copy-protected DVD video.

[0006] For a recordable optical disk, conditions for specifying the amount of light of a recording laser, the type of disk, already recorded information such as the name of a manufacturer, or address information for finding a specific position of a recordable guide groove, as well as 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 emboss pits at the time of cutting the disk master, and the disk substrate is formed by using a metal matrix formed on the disk 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 recorder 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 described above is recorded as LPP in a specific portion of the guide groove with an increased width. (3) Further, the above-mentioned frequency information is recorded as a frequency of a wobble in which the guide groove is slightly shaken in the radial direction.

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 disc is a DVD-RW disc, the photosensitive resist is uniformly applied to a thickness of about 30 nm on a glass disc.

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, by irradiating the resist disc with intermittent light or a cutting laser beam slightly vibrated in the radial direction onto the resist disc, the previously recorded information,
Address information and frequency information are recorded at respective specific positions.

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

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 by using electroplating. By processing this plating board to a desired size and forming a metal matrix, using an injection molding machine equipped with the metal matrix, the shape information is transferred as a shape change onto a plastic substrate by being transferred, 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 grooves and the pits have the same depth over the entire disk substrate.

As described above, since the guide groove of the recordable optical disk is formed at a depth necessary for tracking guide at the time of recording, it is attempted to take out 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 a DVD-RAM disc that can be repeatedly rewritten, the guide groove is limited to an allowable 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 (1/8 wavelength of the reproduction wavelength) at which the guide signal from the guide groove is most efficiently taken out. It is a target. The tracking operation to the guide groove is performed by the push-pull method.

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

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

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) As a first method, as shown in FIG. 7, when cutting the resist disc, a cutting laser beam (laser A for convenience) for forming pits and guide grooves is used. A method of forming a depth that is convenient for pit reproduction with one output and a shallow groove that is convenient for recording a guide groove with the other output. It is. 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 the uniformity of the bottom surface of the guide groove, and the signal characteristics of recording / reproducing greatly deteriorate.

In FIGS. 7 and 8, and in the following description, "LP
"P" indicates a "land pre-pit" formed on the land, and the laser B is described as a laser light output for forming the land pre-pit for convenience.

(2) As a second method, as shown in FIG. 8, 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). Also, a method is used in which the 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. With this method, the bottom surface of the guide groove is the surface of the glass master disk, and the shape of the bottom surface of the guide groove is flat. 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 are switched from the pit row to the pit row to the guide groove and from the guide groove to the pit row to the pit row. Disturbances such as signal loss and difference in amplitude, difference in tracking signal amplitude such as push-pull method, and occurrence of offset occur.

As described above, when one recording-type optical disk includes both a pit array having a depth convenient for reproduction and a guide groove having a depth convenient for recording and reproduction, In order to achieve sufficient recording / reproducing characteristics, it is desirable to design the glass master so that the surface of the glass master comes to the bottom of the guide groove so that the bottom is flat. Then, when reproducing the part where the pit line is switched to the guide groove and the part where the guide groove is switched to the pit line, it was found that there is a recording device in which the pit signal is missing or the push-pull tracking of the reproduction is disturbed at the switched part. . 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 at the switching portion where the recording device changes from the guide groove to the pit row. The signal information of the entire pit row was missing. The recording device in which tracking is disturbed in this way is
In the part where the pit train changes from the pit train to the guide groove, and from the guide groove to the pit train, the tracking control signal becomes an abnormal value and tracking is deviated. Some things 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, It is necessary that the groove depth of the groove and the pit depth of the pit row are each the optimum depth, 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 recording and reproduction are both performed. There has been a demand for a disk having excellent characteristics, capable of recording / reproducing even if a pit signal is missing at a portion where a pit and a guide groove are switched, and free from some kind of disturbance of a tracking signal.

Accordingly, the present invention provides a switching method in which the bottom positions of the guide grooves and pit rows formed on the disk substrate are both flat on the same plane, and the pit rows change to the guide grooves or the guide grooves change to the pit rows. In the part, an intermediate area consisting of a pit row whose height changes between the height from the bottom to the side of the guide groove and the height from the bottom to the side of the pit row is provided, and this intermediate area is tracked by the differential push-pull method Good reproduction information from a pit train dedicated for reproduction
Good reproduction information can be obtained together with the recording / reproducing guide groove, the optimum tracking characteristic can always be obtained even in an unrecorded area, and the optimum tracking characteristic can always be obtained even in a recorded area. It is an object of the present invention to provide an information recording medium capable of stably reproducing copyright protection information of a reproduction-only pit string and recording contents based on the information.

Hereinafter, the information recording medium of the present invention will be described in detail with reference to the drawings. FIG. 1 is an enlarged cross-sectional view for explaining a first embodiment of the information recording medium of the present invention, and FIG. 2 is a diagram for explaining that data to be recorded on the information recording medium of the present invention is converted into ECC blocks. FIG. 3 is a diagram for describing recording of ECC-blocked data in a predetermined area of the information recording medium of the present invention in sector units.
Is a DVD-RW which is an embodiment of the information recording medium of the present invention.
FIG. 5 shows a physical format of one sector in FIG.
FIG. 6 is a diagram showing a lead-in area and a data area of the information recording medium of the present invention, FIG. 6 is an enlarged sectional view for explaining a second embodiment of the information recording medium of the present invention, and FIG. FIG. 8 is a diagram for explaining another example of the cutting state in the information recording medium.

In the following description, a DVD-RW is used as an embodiment of the information recording medium of the present invention.
Recording information on the D-RW will be mainly described. However, it goes without saying that the present invention can be applied to other recordable high-density optical discs such as CD-RW, DVD + RW, and next-generation DVDs.

Embodiments of the present invention are described in B. “Embodiment of recording format”; The description will be made in the order of “disc embodiment”. A. “Embodiment of Recording Format” First, “Embodiment of Recording Format” will be described. First, a general physical format when recording information is recorded on a DVD-RW and error correction processing on the recording information (lead-in information) will be described with reference to FIGS.

An error correction process in the DVD-RW of this embodiment and an ECC block as an error correction unit in the error correction process will be described with reference to FIG.

Generally, the recording information recorded on the DVD-RW has a physical structure including a plurality of data sectors 20 shown in FIG. Then, in one data sector 20, from the top, ID information 21 indicating the start position of the data sector 20, and the ID information 2
ID information error correction code (I
ED) 22, spare data (for example, CPM) 23, a data area 24 for storing main data to be recorded, and an error detection code (EDC) 25 for detecting an error in the data area 24. Recording information to be recorded is constituted by a plurality of consecutive data sectors 20.

Next, using this data sector 20, E
Processing for configuring a CC block will be described with reference to FIG. When forming an ECC block using the data sector 20, as shown in FIG. 2B, first, one data sector 20 is divided horizontally into 172 bytes, and each divided data (this Is hereinafter referred to as a data block 33). At this time,
12 rows of data blocks 33 are arranged in the vertical direction.

The 10-byte ECC code (P) is assigned to each of the horizontal data blocks 33 arranged in the vertical direction.
I (Parity In) code 31 to the data block 33
To form one correction block 34. At this stage, 12 correction blocks 34 to which the ECC internal code 31 is added are arranged in the vertical direction. Thereafter, this process is repeated for 16 data sectors for 20 times. As a result, a correction block 34 of 192 rows is obtained.

Next, the above-mentioned 192 line correction block 34
Are arranged in the vertical direction, this time, the correction block 34 of 192 rows is vertically divided from the beginning every byte, and 16 ECCs are assigned to each divided data.
An outer code (PO (Parity Out) code) 32 is added. The ECC outer code 32 is also added to the ECC inner code 31 in the correction block 34.

By the above processing, one ECC block 30 including 16 data sectors 20 is formed as shown in FIG. At this time, one ECC block 30
Is the total amount of information contained in (172 + 10) bytes × (192 + 16) rows = 378
56 bytes, and the data recorded in the actual data area 24 is 2048 bytes × 16 = 32768 bytes.

The ECC block 3 shown in FIG.
At 0, 1-byte data is indicated by “D #. *”. For example, “D1.0” indicates 1-byte data arranged in the first row and the zeroth column, and “D190.
“170” indicates 1-byte data arranged in the 190th row and the 170th column. Therefore, the ECC code 31
Are arranged in the 172nd to 181st columns, and the ECC outer code 32 is arranged in the 192nd to 207th rows.

Further, one correction block 34 is a DVD-R
It is recorded continuously on W. Here, as shown in FIG. 2B, the ECC block 30 is divided into ECC inner codes 31 and ECC.
The configuration including both of the CC outer codes 32 is shown in FIG.
2B, the data arranged in the horizontal (horizontal) direction is corrected by the ECC inner code 31, and the data arranged in the vertical (vertical) direction in FIG. 2B is corrected by the ECC outer code 32. It is. That is, E shown in FIG.
In the CC block 30, it is possible to perform double error correction in the horizontal (horizontal) direction and the vertical (vertical) direction,
The configuration is such that error correction can be performed more powerfully than error correction processing used for a conventional CD (Compact Disk) or the like.

More specifically on this point, for example,
One correction block 34 (as described above, one line of ECC
It contains a total of 182 bytes of data including the inner code 31, and is recorded continuously on the DVD-RW. ) Is up to 5 bytes, it can be corrected even if it is destroyed by a flaw, etc. However, if one row is destroyed by a flaw or the like on a DVD-RW with 6 bytes or more, the ECC internal code 31 can correct it. Disappears. However, even if an entire row is destroyed by scratches, etc., when viewed from the vertical direction,
Only one byte of data is destroyed for one column of the ECC outer code 32. Therefore, if error correction is performed using the ECC outer code 32 in each column, even if all of one correction block 34 is destroyed, error correction can be performed correctly and reproduction can be performed accurately. However, taking into account the occurrence of acquired scratches and the like, it is needless to say that an increase in the number of scratches in a row (horizontal) leads to an error in the next row (horizontal) in the vertical direction. By the way,
This vertical error can be corrected even if there are 8 vertical columns (16 columns by erasure correction).

Next, the ECC block 3 shown in FIG.
0 is a data sector 20
How it is recorded in the RW will be described with reference to FIG. In FIG. 3, the data indicated by “D #. *” Corresponds to the data described in FIG.

When recording the ECC block 30 on a DVD-RW, first, as shown in FIG.
The blocks 30 are divided into 16 recording sectors 40 by being arranged in a row in the horizontal direction for each correction block 34 and interleaved. At this time, one recording sector 40 has 2366 bytes (3
7856 bytes ÷ 16), which includes the data sector 20 and the ECC code 31 or ECC.
CC outer code 32 is mixed. However, at the beginning of each recording sector 40, ID information 21 (see FIG. 2A) in the data sector 20 is arranged.

Then, one recording sector 40
Is divided into 91-byte data 41 as shown in FIGS. 3B and 3C, and a sink H is added to each of them.
After that, the recording sector 40 in this state is 8--
By performing the 16 modulation, one sync frame 42 is formed for each data 41. At this time, one sync frame 42 has a sync H ′ as shown in FIG.
And data 43. The amount of information in one sync frame 42 is 91 bytes × 8 × (16/8) = 1456 bytes.
Information is written to the D-RW disc. At this time, one recording sector 40 includes 26 sync frames 42.

This will be described with reference to FIG. The leading sector of an ECC block consisting of 16 physical sectors is configured as shown in FIG. In other words, the row is composed of 186 bytes of 172 bytes of data, 10 bytes of PI and 4 bytes of sync, and is composed of 13 rows obtained by adding one row of PO to 12 columns. The sink is 2 from H0 to H25
26 bytes.

By recording information on a DVD-RW disc by constructing the physical format described above, if the information is reproduced by 8-16 demodulation and deinterleaving (see FIG. 3), the original data can be obtained. Since the ECC block 30 can be restored and the amount of destroyed data blocks can be minimized, information can be reproduced most accurately by performing strong error correction as described above. Information relating to copyright protection (for example, a media key block) located in the lead-in information area is recorded as a part of data of such an ECC block.

B. "Embodiment of Disc" A characteristic intermediate area in a recordable optical disc which is an example of the information recording medium of the present invention is shown in FIG.
As a second embodiment, the present invention relates to a recordable optical disk having a disk substrate made on the basis of a resist disk shown in FIG. 1 is formed between the recording / reproducing area (area 1), the reproduction-only area (area P1) and the reproduction-only area (area P2), or the reproduction-only area (area P2).
This is a recordable optical disc having an intermediate area formed between 1) and a recording / reproducing area (guide groove 1).

As shown in FIG. 1, the pit row PA in the area P1
, The bottom of the pit row PB in the area P2 (the glass master), the bottom of the guide groove 1 in the area 1 (the glass master), and the bottom of the pit row PM in the intermediate area (the glass master). 6) are on the same plane, and as shown in FIG. 6, the bottom surface of the pit row PA in the area P1 (the glass master side).
The bottom surface of the guide groove 1 in the region 1 (the glass master side) and the bottom surface of the pit row PM in the intermediate region (the glass master side) are on the same plane.

The depth (optical depth) of the pit PM with respect to the bottom surface of the pit row PM in the intermediate area is, for example, as shown in FIG. 1, the land depth (optical depth) on the read-only area (area P1) side. From the depth of the land in the area P1 with respect to the bottom surface (the glass master side) of the pit row PM, the depth a in FIG. 1, the depth of the land in the read-only area (area P2) (optical depth, pit row) The depth of the land (the depth b in FIG. 1) of the land P2 with respect to the bottom surface (the glass master side) of the PM is reduced to a depth (optical depth) of the pit PM with respect to the bottom surface of the pit row PM in the intermediate region. For example, as shown in FIG. 6, the depth of the land on the read-only area (area P1) side (optical depth, the depth of the land in the area P1 with respect to the bottom surface of the pit row PM (glass master)), as shown in FIG. Now, from the depth c) in FIG. Depth of the lands (optical depth, the bottom of the pit array PM (the depth of the land area 1 to the glass master side), the depth d of FIG. 6) is configured to decrease.

As described above, even for a recordable optical disk, a disk on which a sufficient reproduction signal can be obtained by recording / reproducing in the guide groove and in which irrewriteable information can be recorded in a pit row is used. It is necessary that the groove depth and the pit depth of the pit row are each the optimum depth, and the bottom surface of the guide groove and the bottom surface of the pit are both on the surface of the glass master disk and have excellent recording and reproduction characteristics. It is necessary that the disc has no pit signal missing and no tracking signal disturbance at the switching portion of the guide groove.

Hereinafter, the present invention will be described with reference to the drawings. 1 and 6 are views for explaining a cutting state in an embodiment of an optical disk master according to the present invention. In the present invention, the groove depth of the guide groove and the pit depth of the pit row are designed to be different by exposing the resist of the guide groove, and the bottom surface of the guide groove and the pit row depth is formed by the surface of the glass master disk. In addition, a recording type optical disc is proposed in which an intermediate area for changing the height of the guide groove is provided by changing the resist exposure laser output at the portion where the pit row is switched to the guide groove and from the guide groove to the pit row. In particular, in FIGS. 1 and 6, signals in a range of an amplitude difference and an offset level in which a tracking error signal of a differential push-pull and a DPD (Differential Phase Detect) can be obtained in an intermediate region can be obtained.

As a result, the pit signal adjacent to the guide groove at the switching portion between the pit row and the guide groove is not greatly affected by the resist exposure due to the adjustment of the guide groove resist thickness. It was confirmed that accurate reading of the recorded information and accurate recording of the recorded information in the recording area could be performed.

The master disk of the recordable optical disk of the present invention is manufactured by the following steps using a cutting device (not shown).

A glass disk having a smooth surface is prepared, and a resist is applied on the surface of the glass disk to a thickness corresponding to a depth having a deepest shape (corresponding to the depth of the pit row).
Two lasers (beams) emitted from the laser light source 1
On the optical path of the laser (beam) A of A and B, an optical polarizer for slightly oscillating the laser beam left and right and an optical modulator for changing the laser beam intensity are sequentially provided.

As shown in FIG. 1 or FIG. 6, a guide groove 1 having a bottom surface on a glass master disk surface on a resist disk R has a laser beam intensity (laser beam intensity) suitable for recording the guide groove using a laser (beam) A. PA1). At this time, the bottom surface of the guide groove 1 is exposed to the surface of the glass master. Guide groove 1
Causes a slight wobble at a predetermined frequency. The laser beam B is required for the guide groove 1 because a resist thicker than the resist necessary for forming an appropriate guide groove depth exists beside the guide groove portion (between the guide grooves 1 and the land, land). Laser light intensity (PB
Record in 1). Further, at the time of land pre-pit recording, a laser beam intensity necessary for land pre-pit formation is output.

At this time, a pinhole or the like is inserted on the beam expander 9 for extracting the laser (beam) B, and the laser (beam) B reduces the beam system introduced to the objective lens 12 and collects the laser (beam) B on the resist board. A device for enlarging the spot of the laser (beam) B that emits light may be incorporated, for example, a device for exposing one track width may be included. At this time, the laser (beam) B may be slightly wobbled at a predetermined frequency.

Next, as shown in FIG. 1, following the formation of the guide groove 1 in the recording / reproducing area (area 1), the guide groove 2 in the pit area pit row PB in the area P2 uses the laser (beam) A. And exposure at a laser beam intensity (PA3) suitable for recording the guide groove 2. At this time, the bottom surface of the guide groove 2 is preferably exposed to the surface of the glass master disk, but is not particularly limited. In addition, laser (beam) B
Next to the guide groove part (between the guide groove and the land. Land)
In the pit row PB (region P), the same resist thickness as that of the guide groove 1 (region 1) remains, and the resist thickness sequentially increases.
In the guide groove 1 adjacent to the pit row PB (area P2), the laser beam reaches the same resist thickness as the pit row PB (area P2) in the guide groove 1 adjacent to the pit row PB (area P2) so that the resist having the thickness required for 2) remains. Formed with light intensity. Further, at the time of land pre-pit recording, a laser beam intensity necessary for land pre-pit formation is output. At this time, the laser (beam) B may be slightly wobbled at a predetermined frequency.

Subsequently, a laser (beam) A is used to expose pits and is exposed in the entire resist thickness direction in a region P1 having identification information indicating that the optical disk is a recordable optical disk having a pit row PA. Is recorded at a laser beam intensity (PA2) suitable for the exposure, and the surface of the glass master is exposed. At this time, the pit row PA is slightly wobbled at a predetermined frequency. In some cases, no wobble is needed.

Thus, the recording / reproducing area (area 1)
And a read-only area (areas P1 and P2), a recording / reproducing area (area 1), and an intermediate area. ) Is recorded.

In the next development step, the latent image is precipitated as a shape change, and carried to a metal master forming step. In the metal master forming process, a conductive film such as nickel is coated on the resist disc R, and nickel plating or the like is applied thereon.
A nickel coating is formed. Thereafter, the metal master made of nickel is peeled off from the resist disc R, and the peeled metal master is washed and processed into a size that can be mounted on a molding die. The metal master after processing is called a matrix. A mother disk is mounted on a molding die, and a plastic disk substrate is formed by molding.

Thereafter, a recording functional film (recording layer) is formed on the disk substrate, and for example, a protective film is applied thereon, or a substrate called a dummy substrate is bonded to manufacture a recording type disk. You.

The first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 6 are formed in almost the same manner, but in FIG. 6, an intermediate area is formed as a pit area (pit row PM) between the area P1 (pit row PA) and the area 1 which is a recordable area in FIG. Is different.

The depth (optical depth) of the pit row PM in the intermediate region is equal to or less than the depth (optical depth) of the region P1 (optical depth), and is accurately determined. In some cases, the depth cannot be specified (optical depth).

Next, an embodiment of a disk format will be described. The type (type) 1 shown in FIG. 5 uses a comparative example shown in FIG. 8 and is continuous from a track of a pit P area dedicated for reproduction on the right to a left recordable groove G (groove) area on a disk described later. Is shown. In FIG. 8, "LPP" indicates "land pre-pits" formed on a land, and laser B is a laser beam output for forming land pre-pits. 1 and / or FIG. 6 shows that the depth changes between a track in a pit area dedicated to reproduction on the right and a recordable groove G (groove) area on the left in a disk described later as type 2 in FIG. This indicates that there is an area having a pit which is an intermediate area.

FIG. 5 shows the structure from the lead-in area (inner direction) to the data area (outer direction) of the disk in the embodiment of the present invention. As described above, this region is different in the manufacturing method of the disk, and the region t
type (type) 1 and the type described in this embodiment
It is configured so that two types (type) 2 can coexist as a format. In this format, signal performance (recording / reproduction characteristics) is used for type (type) 1.
Is not very good, but is relatively easy to manufacture,
In type (type) 2, signal performance (recording / reproduction characteristics) is preferable, but by coexisting two systems that require a restriction on signal performance in an intermediate region, flexibility can be given to a manufacturing method.

A lead-in area of type (type) 1 is (1-1) a land area on an outer peripheral side of a wobble and a groove area having a depth of about λ / 12 from an inner circumference which is a recordable / reproducible area. Initial zone, which is a recordable and reproducible area having a land pre-pit LPP having information such as an address and from which a differential push-pull tracking error signal is obtained.
system reserved zone, buff
er zone0, RW-physical form
at information zone, Refer
ence code zone, buffer zone
e1, 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 wobbles but no land prepits LPP can be obtained and from which a recording signal can be read. Control data with information and lead-in information
zone (Readable emboss with
out LPP), (1-3) in a read-only area in which a DPD tracking error signal having a depth of about λ / 12 and comprising a pre-pit having a wobble and a land pre-pit LPP is obtained and a recording / reproducing signal cannot be read. Certain unreadable emboss zone z w
is a LPP, (1-4) a recordable / reproducible area having a land prepit LPP having information such as an address in a land area on the outer peripheral side of the wobble and groove areas, and a differential push-pull tracking error signal. Buffer zone that gives
e2, da for recording the user content that follows
The area is divided in the outer circumferential direction in the order of taarea. Here, the start address of each area is shown at the upper right of each area. The operation at the time of recording of type (type) 1 is shown in Write Mode on the left side of FIG. 5, and the operation at the time of reproduction is shown in Read Mode on the left side of FIG.
"recording" indicates a recording operation, "reading" indicates a reproducing operation, "seek" indicates a seek operation or an operation of skipping a track, and "read 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. ing.

Next, the lead-in area of type (type) 2 is (2-1) a wobble and a land area on the outer peripheral side of a groove area having a depth of about λ / 12 from the inner circumference which is a recordable / reproducible area. Is a recording / reproducing area in which recording / reproducing is possible and has a land pre-pit LPP having information such as an address, and an initial zone where a differential push-pull tracking error signal is obtained.
e, system reserved zone, bu
fffe zone0, RW-physical fo
rmat information zone, Ref
erence code zone, (2-2) boundary flag zone 1 (which may be absent) in which a code for determining whether the type is 1 or type 2 is recorded.
mbos zone1 (from a depth of about λ / 12,
(2-3) A pit area formed to have a depth of about λ / 4 and having a wobble and capable of obtaining a differential push-pull tracking error signal and a DPD tracking error signal. A read-only area from which a DPD tracking error signal composed of prepits having depth but having wobbles but no land prepits LPP can be obtained and from which a recording signal can be read, and having information relating to copyright protection and lead-in information.
control data zone (Readable
emboss without LPP), (2-
4) type (type) 1 or type (type) 2
Boundary where the code for determining whether
flag zone2 (may not be present), a boundary emb having a structure reverse to that of the intermediate region described above.
ossone 2 (from about λ / 4 depth to about λ /
(A pit area formed to have a depth of about 12 in which wobbles and LPPs are recorded (LPPs may be omitted), a differential push-pull tracking error signal and a DPD tracking error signal are obtained), 2-5) Unread, which is a read-only area in which a DPD tracking error signal having a depth of about λ / 12 and composed of a prepit having a wobble and a land prepit LPP is obtained and a recording signal cannot be read.
able embossone with LPP,
(2-6) 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 wobble and a groove area having a depth of about λ / 12, and is a recordable / reproducible area. The area is divided in the outer peripheral direction in the order of buffer zone 2 from which a push-pull tracking error signal is obtained, and dataarea for recording 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) 2 is represented by Wr on the right side of FIG.
item mode, and the operation at the time of reproduction is indicated by R on the right 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.

Boundary flag zone 1
The boundary flag zone 2 and the boundary flag zone 2 need not be located at this position, but the boundary zone 1 and the boundary flag zone 2 have the above-mentioned lead-in information so as to change the recording / reproducing method depending on the type (type) 1 or type (type) 2 of the disc. The control data zone and the address information of the LPP in the recordable area are embedded and recorded in advance, and the type of the disc to be recorded / reproduced is recorded.
e (type) 1 or type (type) 2 can be determined.

Next, type (type) 1 and type
Referring to FIG. 9, a case where this area is commonly reproduced and a case where this area is recorded on a (type) 2 disc will be described. FIG. 9 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. 9 shows an outer circumferential direction in the direction of each track from track number 1 to track number 9.
Corresponds to track number 1 of type 1
Each track of track number 2 has a land pre-pit 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 an initial zone and system response where a differential push-pull tracking error signal is obtained.
rved zone, buffer zone 0, RW
-Physical format informat
ion zone, Reference code z
one, buffer zone1, linking
loss area. Wobble signals are arranged in all the regions in FIGS. Each track of track number 3 and track number 4 is approximately λ /
A DPD tracking error signal composed of prepits having a depth of about 4 and having no land prepits LPP is obtained, and a read-only area C in which a recording signal can be read out.
control data zone (Readable
emboss with LPP). DPD in which each track of track number 5, track number 6, and track number 7 has a depth of about λ / 12 and has prepits having land prepits LPP
Unreadable em which is a read-only area where a tracking error signal is obtained and a recording signal cannot be read.
boss zone with LPP. Recordable and reproducible information in which each track of track number 8 and track number 9 has a land prepit LPP having information such as an address in a land area on the outer peripheral side of the groove area and a differential push-pull tracking error signal is obtained. Recordable / reproducible area (Data a
rea).

Next, the track of track number 1 of type 2 is a land area on the outer circumference side of a groove area having a depth of about λ / 12 from the inner circumference which is a recordable / reproducible area in the lead-in area. Is a recordable and reproducible area having a land pre-pit LPP having information such as an address, and is provided with a differential push-pull tracking error signal.
zone, system reserved zone
e, buffer zone 0, RW-physica
l format information zone
e, Reference code zone and the like. The track of track number 2 is an intermediate area. 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 without land prepits LPP and from which recording signals can be read. Control data zone (Readab
le emboss with LPP). The track of track number 5 is an intermediate area. Each track of track number 6 and track number 7 is
Land pre-pit LPP with a depth of about λ / 12
A DPD tracking error signal composed of a prepit having
with LPP. A recordable / reproducible area in which each track of track number 8 and track number 9 has a land prepit LPP having information such as an address in a land area on the outer peripheral side of the groove area and a differential push-pull tracking error signal is obtained. (Data area).

In this arrangement, when performing recording or reproduction, type (type) 1 or type (type)
2 needs to be determined. As a method of detecting the type (type) 1 or the type (type) 2, when the disc is inserted and the start-up process is performed, the control data zone having the lead-in information is reproduced, and the type (type) is stored in this area. 1 or type
If (type) 2 is recorded, determination is made based on this value. This can be read by a recording device or a reproducing device in a similar manner. In another example of the present embodiment, b
"oundary flag zone1" and "bound"
type as LPP in ary flag zone2
Since (type) 1 or type (type) 2 is recorded, it can be determined by reading this value 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 the unrecorded disk.

Now, in the case where type (type) 1 is recorded in order from the track of track number 1 (Write Mode shown on the left side of FIG. 5), each of track number 1, track number 2, track number 8, and track number 9 is recorded. The track is a track to be recorded. As described above, there is a wobble frequency signal on both sides of the track in all areas, and this frequency signal is detected, and a speed signal for rotating the disk is fed back to the disk. Is controlled at a constant linear velocity and a recording clock signal is generated. Next, an LPP recorded on the land 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 (record in the Write Mode shown on the left side of FIG. 5).
ing, Initial zone ~ Linking
loss area). Then, the recording is stopped at the linking timing at the address corresponding to the track of the track number 3, and the reproduction state (W shown on the left side of FIG. 5).
write mode).

The track of track number 3 is composed of reproducible pits in the recording area. Although there is no LPP signal, an address is detected from the reproducible pits, and a reproducing operation is performed based on the address (see the left side of FIG. 5). Write Mod shown
reading in e, Control data
zone (Readable emboss wit
hout LPP)) The processing is performed up to the track of track number 4. Next, the track No. 5, the track No. 6, and the track No. 7 are tracks in which the pit signal cannot be reproduced. In this area, the wobble signal and the LP
Since there is a P signal, the wobble signal and the LPP address are reproduced during reproduction of this track, and a recording clock and a recording timing are generated (Write Mod shown on the left side of FIG. 5).
e, reading gen wclk, Unr
eadable emboss with LPP),
Similarly, recording is started at the linking timing on the track having the track number of track number 8 and thereafter, and the subsequent recording process is performed (recording, buffer zone 2 to 2 in write mode shown on the left side of FIG. 5).
Data area). Here, type (type) 1
On both sides of the track, all tracks are symmetrical, each track of track number 2 and track number 3, each track of track number 4 and track number 5, and each of track number 7 and track number 8 The tracking error signal due to the differential push-pull at the track boundary can be continuously obtained with a certain amplitude difference.

As described above, since the boundary of the pit area can be continuously recorded, the RF signal can be continuously obtained at the time of the reproduction, and the processing at the time of the reproduction (the R signal shown on the left side of FIG. 5).
In the "Ead Mode", the tracking error is reproduced in order from the track of track number 1 to the track of track number 9 using the phase difference method (DPD) (differential push-pull may be used) (Rea shown on the left side of FIG. 5).
reading in d Mode, Initial
zone ~ Control data zone (R
eadable emboss without LP
P)). At this time, since the signals of the track Nos. 5, 6, and 7 cannot be reproduced, they are skipped (Read shown in the left side of FIG. 5).
Seek, Unreadable in Mode
emboss with LPP ~ buffer zo
ne2) Then, the tracks of track numbers 8 and thereafter are continuously reproduced (Rea shown on the left side of FIG. 5).
reading, Data ar in d Mode
ea).

Next, when recording type (type) 2 in order from the track of track number 1, the tracks of track number 1, track number 8, and track number 9 are tracks 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 type 2 is a recordable track.
The reason is that the track of track number 2 has different lands on both sides of the track, and the wobble signal and LPP necessary for recording are different.
This is because even if a signal is recorded, the signal cannot be obtained at the signal amplitude or the offset level of the signal as in the previous track, and there is a possibility that the recording clock or the timing signal cannot be obtained accurately. .

Similarly, the track of track number 5, which is the intermediate area, has different lands on both sides of the track.
Even if the wobble signal and the LPP signal necessary for recording are recorded, an accurate signal may not be obtained at the signal amplitude or the offset level of the signal as in the previous track. Since a signal may not be accurately obtained, a recording clock or a timing signal may be accurately obtained on a track having a track number of track number 6 or later.

The recording process is performed in order (Writ shown on the right
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, an LPP recorded on the land 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 (rewrite in Write Mode shown on the right side of FIG. 5).
cording, Initial zone ~ boun
Initiate the daily flag zone 1).

Then, the recording is stopped at the linking timing corresponding to the address corresponding to the track of the 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
ndary flag zone 2). The track of track number 3 has a recording area composed of reproducible pits and does not have an LPP signal.
(Tracks of Write M shown on the right side of FIG. 5)
reading, Control da in mode
ta zone (Readable emboss w
itout LPP)-boundary flag
zone 2).

Next, the track of track number 5 may not be able to reproduce the pit signal, and the LPP signal is a track that may not be accurately reproduced, so that it is skipped. 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 signal and the LPP address are reproduced to generate a recording clock and a recording timing (reading gen wclk, Unrea in Write Mode shown on the right side of FIG. 5).
Similarly, recording is started at the linking timing on the track having the track number of track number 8 or later, and the subsequent recording process is performed (rewrite in Write Mode shown on the right side of FIG. 5).
coding, buffer zone 2-Data
area).

Here, in the type (type) 2, the tracks 2 and 5 in which both sides of the track are intermediate areas are also asymmetric, and in the track at this boundary, the tracking error signal of the push-pull system shows the amplitude difference and offset. Although it occurs and recording or reproduction cannot be performed accurately, the tracking error signal by the differential push-pull method can be continuously obtained within a certain allowable range of the amplitude difference.

By arranging the areas in this way, the boundaries of the pit areas can be recorded continuously,
The F signal can be obtained continuously, and the processing during reproduction (FIG. 5)
(Read Mode) shown on the right side of (1) uses a tracking error as a phase difference method (DPD) (differential push-pull may be used) to sequentially reproduce tracks from track number 1 to track number 9. At this time, in type (type) 2, signals cannot be reproduced from the tracks of track number 2, track number 5, track number 6, and track number 7, so that the tracks are skipped (see, seek in Read Mode shown on the right side of FIG. 5).
Initial zone ~ boundary emb
oss zone 1, boundary flag
zone2-buffer zone 2), and then
Each track having track numbers 3, 4, and 8 and subsequent track numbers is continuously played back (reading, control data zone in Read Mode shown on the right side of FIG. 5).
e (Readable emboss withwithout
LPP) ~ boundary flag zone
2, Data area).

Further, suppose that type (type) 1 and ty
type cannot be detected for pe (type) 2 type
(Type) If it is set to 1, or by mistake
The present invention is also effective when e (type) 2 is detected as type (type) 1. In other words, in this case, in the case of recording, the recording apparatus attempts to perform the recording process on the track with the track number 2, but with the track number with the track number 2,
Even if the wobble signal can be detected, the LPP cannot be detected accurately, so the recording is stopped halfway. Alternatively, the recording processing is performed while performing the complement processing of the LPP signal in the signal processing circuit. Even if all tracks of track number 2 have been recorded, when this track is reproduced,
Since a tracking error signal can be obtained from this area, a reproduction signal cannot be read from the track of track number 2, but continuous reproduction is possible without any problem. There is a possibility that the track with track number 5 cannot read the LPP signal, but since it is read from the next track, recording and reproduction can be performed without any problem.

FIG. 10 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a third embodiment of the present invention. The buffer zone 1 of type (type) 2 shown in FIG. 5 is unr in FIG.
eadable emboss with LPP b
The difference is that the flag is “oundary flag 1”. Also in this case, a wobble signal is recorded in all areas, and a wobble signal can be obtained in all areas. This disc is designated as type (type) 3. type
Regarding the (type) 3 recording and reproducing operations, the right side of FIG.
Mode. For this behavior,
Able emboss with LPP bou
Since it is the same as type (type) 2 except for ndaryflag 1, the description of the overlapping operation is omitted.
The description of the operation different from type 2 is as follows. unreadable emboss with
The region of LPP boundaryflag 1 is u
nreadable emboss with LPP
Same as the area, in the LPP in this area,
The difference is that dary flag1 is written. In FIG. 10, the place to be recorded in the buffer zone 1 is an unreadable emboss area, so that the reference code z
One ends recording, and switches to a reproducing operation. Note that type (type) 1 is the same as type (type) 1 shown in FIG. 5, and a description thereof will be omitted.

FIG. 11 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a fourth embodiment of the present invention. Also in this case, a wobble signal is recorded in all areas, and a wobble signal can be obtained in all areas. The type (type) 4 and the type (type) 5 shown in FIG. 11 are the boundary emboss zone 1 of the type (type) 2 shown in FIG.
And boundaryemboss zone2 are shown in FIG.
Type (type) 1 and type (type) 2 shown in
And at the same address. b
ordinary emboss zone 1 and bou
As described above, the second embodied zone 2 is an area composed of embossed pits as shown in the control table shown on the right side of FIG.
In (type) 4, wobble and LPP are recorded, but in type (type) 5, wobble is recorded, but LPP may not be recorded. Or LPP
Is an area that cannot be read accurately even if it is recorded. The emboss pits in this area may or may not be able to reproduce data. type (type) 4
Or, the identification information indicating that the type is 5 is LPP or readable control data.
It is recorded in advance in a reproduction-only area such as a zone.

With such a format, the recording operation (Write Mode) and the reproducing operation (Read Mode) in FIG. 11 are performed in the link operation in the recording operation (Write Mode) as shown on the left side of FIG.
Record up to ng loss area (recordin
g) and switch to playback mode (reading),
readable emboss with reproduces a wobble signal from the LPP area, generates a clock for recording, generates an address signal from the LPP, generates a recording timing (reading gen wclk),
Next, record again from the buffer zone (recorder
ding). Since the reproducing operation is the same as that of the above-described embodiment, the description is omitted.

As described above, even in type (type) 4, t
The same recording / reproducing method can be used for type 5
Since it can be applied, there is an advantage that the design of the apparatus is easy. However, as described above, type (type) 4
In the case of, the tracking signal is almost no problem with push-pull or differential push-pull,
In the case of (type) 5, the tracking signal has almost no problem in the differential push-pull, but in the push-pull, the boundary emboss zone 1 is used.
And it is difficult to pass continuously through the boundary emboss zone 2 and the type (type)
4 or type (type) 5 identification information by LPP or readable control data zone
By recording in advance in a read-only area such as e, it is possible to cope with each disc.

The disk t described in each of the embodiments described above.
When classifying the type (type), the type (type) 1
And type (type) 4 are in the same group,
In the following description, this will be described with type (type) 1 as a representative. In addition, type (type) 2, type
Since e (type) 3 and type (type) 5 belong to the same group, in the following description, type (type) 2 will be described as a representative. With such a configuration, type (type) 1 and type
(Type) Two different manufacturing methods are permissible and a tracking error signal can be obtained continuously during recording and reproduction, so that recording and reproduction can be performed continuously without interruption. DVDs on sale
-To increase the added value of the DVD-RW without affecting the ROM, the DVD video reproducing device and the like.

In the above embodiment, the bo composed of one track pit area which is an intermediate area between the read-only area and the recording area or between the read-only area and the read-only area.
unary emboss zone 1 and bound
Although the ary emboss zone 2 is provided, it goes without saying that the area may be an area of two or more tracks. As can be seen in FIG. 5, type (type) 1 and type
The difference between e (type) 2 is negligible, and boundaryembo, which is the boundary area between the recording area and the read-only area,
boundary embos, which is a boundary area between ss zone 1, the first read-only area, and the second read-only area
s zone2 as a boundary area, an area which does not need to be recorded when an address cannot be detected accurately, or
If an area in which a reproduced signal does not need to be read accurately is defined, type (type) 1 and type (type) 2 can be in a common format. The name used here is an example, and the present invention is not limited to the manufacturing method, the correction format, the disk structure, and the like in the example.

FIG. 12 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a fifth embodiment of the present invention. Also in this case, a wobble signal is recorded in all areas, and a wobble signal can be obtained in all areas. The type (type) 6 and the type (type) 7 shown in FIG. 12 are the boundary emboss zone of the type (type) 4 shown in FIG.
1 is a boundary zone 1; in type (type) 6, this area is a recordable groove area in which wobble and LPP are recorded; and in type (type) 7, this area is wobble recorded, but LPP is recorded. The embossed pit area is not
FIG.
Boundary emboss zone 1 shown in
The wobble and the LPP similar to those described in (1) and (2) are embossed pit areas in which recording is performed. In the case of type 7, even if the LPP is recorded, the LPP does not need to be accurately read. Identification information indicating type (type) 6 or type (type) 7 is recorded in advance in a read-only area such as LPP or a readable control data zone.

If the area is defined as described above, the type
The (type) 6 and the type (type) 7 can have a common format. At this time, there is a case where this area is recorded and a case where it is reproduced. Therefore, if a wobble signal is recorded in advance in this area even if there is no LPP address signal, a spindle speed signal can be generated, and an LPP address signal can be generated. Can be recorded in a circuit-complementary manner. Actually, in the case of the recording of the boundary zone 1, in the case of type 6, as shown in the table, the latter half of the two ECC blocks is linked to the Linki.
ng Loss Area
In the case of type 7, the first half ECC block is
Recording is performed up to this point as ng Loss Area.

Also, boundary emboss z
For the same reason, if the wobble signal is recorded in advance in one2, continuous generation of a recording clock for recording and generation of a spindle speed signal can be performed by using type (type) 6 and type (type) 7. Thus, the recording and reproducing process can be performed while maintaining the compatibility. In this case, in the intermediate region, an offset occurs in the push-pull signal and an offset occurs in the wobble signal in a DC manner. However, if this offset signal is passed through a band-pass filter or the like, the wobble signal is Since the wobble signal can be continuously obtained without any loss or the wobble signal can be lost for a short time, this effect can be eliminated by complementing the continuity of the wobble signal with a circuit. By adopting such a configuration, compatibility is maintained when performing recording and reproduction, a method for manufacturing two discs is enabled, and the development and spread of such a format are contributed.

As is common to all the embodiments, the boundary emboss zone 1 or the boundary zone 1 is formed such that one round of the disk-shaped disc is formed as pits in the intermediate area. The block is an area slightly larger than one round. So, the second half ECC
Several sectors or several sync frames of a block are readable areas in the same manner as the control data zone which is the next area. And this area is at least 2
Since the sync frame is secured, when the control data zone is to be reproduced, the control data zone can be accurately read from the beginning by pulling in the PLL of the reproduction signal and detecting the sync during this time. boundary emboss zone
Similarly, the 2ECC block arranged as an intermediate area is an area slightly larger than one round. Therefore, several sectors or several sync frames of the latter half of the ECC block are areas in which the wobble signal and the LPP signal can be read out in the same manner as the next area, the unreadable emboss zone.

By adopting such a format, the recording operation (Write Mode) and the reproduction operation (Read Mode) in FIG. 12 are omitted from the description of the same processes as those in the embodiment as shown on the left side of FIG. However, information of type 6 or 7 recorded in the LPP or the control data area is acquired, and in the case of type 6, the recording operation (Write mode) is bounda.
Link the last ECC block in ry zone1
ng loss area and record up to this point (rec
ordering), switching to a playback mode (reading), and unreadable emboss with
A wobble signal is reproduced from the LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading gen w).
clk), and then resume recording from the buffer zone. In the case of type 7, the recording operation (Write mode) is bounda
The last ECC block before ry zone1 is li
nking loss area, recording up to this point, and the playback mode (readin).
g) and switch to unreadable emboss
The wobble signal is reproduced from the with LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading g).
en wclk), and then resume recording from the buffer zone. Also, if the type 6 medium is recorded by the type 6 method assuming the type 6 without acquiring the type 6 or 7 information recorded in the LPP or the control data area, the wobble signal is continuously generated. Therefore, continuous recording can be performed based on this signal even when an LPP signal cannot be obtained. In this case, when this area is reproduced, the recorded signal cannot be read out, but no trouble occurs because it is information of one track and is not information of an important information area. The rest of the reproducing operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

FIG. 13 is a view for explaining the concept of the cutting state of the information recording medium according to the sixth embodiment of the present invention. In the above description of the present invention, FIG. 13 shows that the bottom surface is formed at the same depth (position) in the above description of the present invention, whereas the sixth embodiment uses a guide groove having a different bottom surface in FIG. In the intermediate area, the bottom of the pit row region and the bottom of the guide groove region gradually become shallower at a predetermined inclination as going from the guide groove direction to the pit row direction, and again the bottom surface in the pit row is the same as the bottom of the guide groove. It is configured to be a surface. The modified part of the method for manufacturing in this manner is roughly performed as follows in comparison with the conventional method.

In the switching portion between the guide groove and the pit row whose bottom surface is on the surface of the glass master, a condition for cutting the guide groove and land prepit exposed to the surface of the glass master is used as an initial condition. The laser (light) A contains a wobble signal. The wobble signal was laser-oscillated left and right by an optical deflector so that the wobble signal had an amplitude of 15 nm on the resist disk. The laser beam intensity was set such that the width of the guide groove to be cut was 0.3 μm and the groove depth was about 30 nm (PA3). On the other hand, the laser (light) B was set to have a laser beam intensity (PB3) at which a desired land prepit was formed, and the depth of the land prepit to be cut was set to about 30 nm. Cutting was performed at a constant linear velocity. The turntable is equivalent to the track pitch during one rotation of the resist disc.
It was controlled to move at a constant speed from the inner circumference to the outer circumference of the resist board at 0.74 μm. Subsequently, each laser output was continuously changed while cutting the three track slopes. At this time, the laser (beam) A
Was controlled to reach a laser intensity suitable for recording a guide groove having a bottom surface not reaching the surface of the glass master. At this time, the bottom of the guide groove is not exposed to the surface of the glass master. The wobble signal has a laser beam oscillated left and right by an optical polarizer so as to have an amplitude of 15 nm on the resist board. The width of the guide groove to be cut is 0.3 μm, and the laser beam intensity is such that the groove depth is about 30 nm. The laser (beam) B is controlled so as to continuously reach the laser intensity required for forming land prepits beside the guide groove.

Similarly, the switching portion between the pit row and the guide groove having the bottom surface on the surface of the glass master is suitable for recording a guide groove having a bottom surface where the laser (beam) A does not reach the surface of the glass master as an initial condition. In this case, the laser intensity is controlled so as to continuously reach a laser intensity suitable for recording a guide groove exposed to the surface of the glass master while cutting the three-track inclination. Similarly, the laser (beam) B light is set so that the depth of the land pre-pit to be cut during the cutting of the three track inclination is set to be about 30 nm from the laser light intensity at which the desired land pre-pit is formed. Continuously.

As described in the above embodiment, the track in the recordable intermediate area having the inclination of the disk manufactured by the method described above may be slightly moved by the push-pull method as the tracking method or the differential push-pull method. Although this offset may occur, recording and reproduction are possible on this track. Accordingly, since recording cannot be performed by the push-pull method as in the above-described embodiment, it is possible to provide a recordable area without having to be configured with pre-pits. After recording in this area,
With the differential phase detect (DPD) method, stable tracking can be performed with almost no occurrence of offset or the like. In the above-described embodiment, an offset or the like may be generated by the differential phase detect (DPD) method depending on whether the intermediate area including the pit area is overwritten or depending on the pit shape of the intermediate area. In the example, the occurrence of this problem can be solved. The wobble signal is also LP in this intermediate area.
Since the P address signal can also be prepared in advance, the recording operation of the signal to be written can be performed almost accurately, and the reproduction operation of the reproduction signal can be performed similarly.

FIG. 14 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a sixth embodiment of the present invention. Also in this case, a wobble signal is recorded in all areas, and a wobble signal can be obtained in all areas. The type (type) 6 shown in FIG.
14 is substantially the same as the type (type) 6 shown in FIG. 2, and the type (type) 8 shown in FIG. 14 is a boundary zoo of the type (type) 7 shown in FIG.
In ne1, this region is an embossed pit region where wobble can be recorded but LPP is not recorded, whereas in type (type) 8, the wobble and LPP are inclined as described above. The recorded groove area is a recordable groove area, and the LPP in this area is an area in which the LPP cannot be accurately read even if it is arranged. Boundary emboss zone2,
The boundary emboss zo shown in FIG.
The wobble and LPP similar to ne2 are embossed pit areas in which recording is performed. In the case of type 8, even if LPP is recorded, LPP does not need to be read with high accuracy. Identification information indicating type (type) 6 or type (type) 8 is recorded in advance in a read-only area such as LPP or a readable control data zone. For example, the identification information can be defined as 0: no boundary 1: 1: boundary in Media type 3 (media type) of the disc physical code of the LPP information.

If the area is defined as described above, the type
The (type) 6 and the type (type) 8 can have a common format. At this time, when this area is recorded and reproduced, the LPP is temporarily set in this intermediate area.
Even if the address signal cannot be detected from the wobble signal,
A spindle speed signal can be generated, and recording can be performed by complementing an LPP address signal in a circuit manner. Actually, in the case of the boundary zone 1 recording,
EC of 2F1F0h for both type 6 and type 8
The recording is performed so far with the C block as a Linking Loss Area.

Also, boundary emboss z
For the same reason, if the wobble signal is recorded in advance in one2, the recording clock for recording can be continuously generated, and the spindle speed signal can be generated. Thus, the recording and reproducing process can be performed while maintaining the compatibility. In this case, in the intermediate region, an offset occurs in the push-pull signal and an offset occurs in the wobble signal in a DC manner. However, if this offset signal is passed through a band-pass filter or the like, the wobble signal is Since the wobble signal can be continuously obtained without any loss or the wobble signal can be lost for a short time, this effect can be eliminated by complementing the continuity of the wobble signal with a circuit. By adopting such a configuration, compatibility is maintained when performing recording and reproduction, a method for manufacturing two discs is enabled, and the development and spread of such a format are contributed.

By adopting such a format, the recording operation (Write Mode) and the reproduction operation (Read Mode) in FIG. 14 are omitted from the description of the same processing as in the above embodiment as shown on the left side of FIG. However, information of type 6 or 8 recorded in the LPP or the control data area is acquired, and in the case of types 6 and 8, the recording operation (write mode) is
The lin of the last ECC block in the day zone1
King loss area and record up to this point (r
recording) and playback mode (reading)
Switch to unreadable emboss wi
The wobble signal is reproduced from the th LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading gen).
wclk), and then resume recording from bufferzone. Also, in the case where recording is performed in the boundary zone 1 in type 8, when a push-pull method is used as a tracking error, an offset signal within an allowable range is generated in the tracking error signal. By measuring a value of the offset and controlling to cancel the offset according to the value, recording can be performed more accurately. Also, if L
Even when the type 6 medium is recorded by the type 6 method assuming the type 6 without acquiring the type 6 or 8 information recorded in the PP or control data area, the wobble signal is continuously obtained. Therefore, based on this signal, continuous recording can be performed even when an LPP signal cannot be obtained.

The boundary zone described here
The expressions e1 and e2 are expressed as described above because they are regions sandwiched between regions having substantially different depths, but may be expressed as a normal data region as a different expression method. In particular, the difference between Type 6 and Type 8 is slight, and is expressed as a normal data area. As a characteristic of the data in the area, for example, the jitter of the reproduction signal of Type 6 is 8% or less. Is less than 10% or the error rate of the type 6 LPP reproduced signal is a
% Or less, the error rate of the type 8 LPP reproduction signal is b% or less, or the offset of the type 6 tracking signal is c% or less, but the offset of the type 8 tracking signal is d% or less. The difference between the existing data may be defined as the type difference. Further, as a different expression method, the standard value defined for the normal data area is not accurately defined for this area for both Type 6 and Type 8, so that the two types are commonly expressed. There is a way. Further, in this embodiment, the depth of the region of the boundary zone 1 is gradually changed.
e2 also differs only in that it is composed of pits, but similarly, the depth may be gradually changed.

In the seventh embodiment of the present invention, a case will be described in which what is equivalent to the contents of the embodiment in FIG. 14 is defined as the type 1 in FIG. The description of FIGS. 14 and 5 has already been made and is omitted here, but the differences are as follows. That is,
When the difference is considered in a large field of view, ty shown in FIG.
pe (type) 6 is the type (type) shown in FIG.
6 is substantially the same as the type (type) 1 shown in FIG. 5 except that the name of the area is changed, and the type (type) 8 shown in FIG.
ne1 is inclined as described above, and the wobble and LP
Assuming a recordable groove area where P is recorded,
Conversely, since the area is the same as that of buffer zone 1 of type 1, it can be defined as buffer zone 1. Similarly, the boundary em shown in FIG.
Since the wobble and the LPP are embossed pit areas in which the boss zone 2 is recorded, unread
Since the area is the same as the area where the LPP area is unreadable, the unreadable emboss is used.
with LPP region.

According to this definition, type 6 and type 8 in FIG. 14 can be the same as type 1 in FIG. The type 6 and the type 8 described in FIG.
Does not exist. However, two boundary areas where two boundary zones existed as the positional relationship of FIG. 14 (the boundary track is one track near the boundary of a track in a recordable area or a read-only track composed of pits) (Or several tracks), the push-pull tracking error signal among the tracking error signals may be different from the amplitude level and offset level of the normal signal area.

The amplitude of the push-pull tracking error signal is originally different between the recordable area and the read-only area, and is defined in each area. In the boundary area, as shown in FIG. The amplitude of the push-pull tracking error signal in the recordable area when crossing the track at the time of tracking off is defined as an upper peak value P1 and a lower peak value P2 based on the center voltage. Is defined as an upper peak value P3 and a lower peak value P4 based on
3 / (P1 + P2)> 0.2 and P4 / (P1 + P2)
> 0.2. The numerical value of 0.2 is obtained even when the amplitude of the push-pull tracking error signal is reduced.
This value is necessary so that control such as tracking does not become unstable when recording or reproducing this area. In addition,
Since the value of 0.2 varies depending on the measurement method or the like, the value of 0.2 is preferably in the range of about 0.15 to 0.3. For example, in a recordable area other than the boundary area, the value of the offset amount of the amplitude of the push-pull signal is defined using a mathematical formula (P1-P2) / (P1 + P2) as a standard of asymmetry. When an attempt is made to define a boundary region using this equation, as shown in FIG. 15, when the amplitudes of P3 and P4 are symmetrical and the amplitudes are extremely small,
Although the expression of (P1-P2) / (P1 + P2) is satisfied, the tracking servo may become unstable. On the contrary, as shown in FIG. 15, the amplitudes of P3 and P4 are symmetric,
Even if the amplitude is small in a range where the tracking servo is stable, the disc becomes unsatisfactory due to the value of (P1−P2) / (P1 + P2), which causes a deterioration in the manufacturing margin of the disc. Therefore, introducing this new formula to define this area is most preferred for this type of disc.

With such a format, the recording operation (Write Mode) and the reproduction operation (Read Mode) of FIG. 5 are performed as shown on the left side of FIG. 5, but it is determined that the disc is of this type. At this stage, the recording operation (Writemode) is first performed by bo.
l of the last ECC block in the secondary zone1
An inking loss area is recorded up to this point. However, as described above, the area near this linking loss area is a boundary area, and when the amplitude of the tracking error signal is small, the offset level of the tracking error signal may be different from other tracks. Recording control can be stably performed by changing the gain or offset control value during tracking control only when recording an area. Further, the offset level of the tracking error signal in this area may be measured in advance, and the control value may be changed according to the learned result. Next, the mode is switched to a reproducing mode (reading), the control data area is reproduced, and the unreadable emboss is reproduced.
The wobble signal is reproduced from the LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading).
gen wclk), and then resume recording from the buffer zone. From this control data area, unreadable em
The boundary between the bus with LPP areas is also a boundary area. At this time, similarly, when the amplitude of the tracking error signal is small, the offset level of the tracking error signal may be different from other tracks. Recording control can be performed stably by changing the gain and offset control value during tracking control only when reproducing. Further, the offset level of the tracking error signal in this area may be measured in advance, and the control value may be changed according to the learned result. Next, the reproduction operation (Read Mode) in FIG.
When it is determined that the disc is of this type, first, when reproducing the control data area, the bound
link of the last ECC block of ary zone1
It is a usual method to move to the vicinity of the ing loss area and reproduce the first area of the control data area. In this case, as described above, this linking is performed.
The area near the loss area is a boundary area,
If the amplitude of the tracking error signal is small, the offset level of the tracking error signal may be different from other tracks, so by changing the gain and offset control value during tracking control only when reproducing this area It is possible to pass by performing stable recording control. Further, the offset level of the tracking error signal in this area may be measured in advance, and the control value may be changed according to the learned result. Since this area is recorded as information having no meaning such as 0 data, even if the reproduced data has an error, it can be skipped. After the control data area is reproduced and necessary lead-in information and information on copy protection are obtained, the control data area is moved to the data area and the content is reproduced.

Note that the manufacturing method, configuration,
The name is an example, and the present invention is not limited to the manufacturing method, the correction format, the disk structure, and the like in the example.

[0105]

According to the present invention, by providing an intermediate area between the read-only area and the recording area or between the read-only area and the read-only area, the recording / reproducing signal characteristics can be improved, and There is an advantage that problems such as lowering of trackability at the time of recording due to generation of an excessive offset signal in the tracking error signal or lack of the tracking error signal do not occur. Also,
There is an advantage that recording or reproduction can be performed without any problem even with discs of different types.

[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 shows data recorded on an information recording medium of the present invention in EC format.
FIG. 4 is a diagram for explaining that a C block is formed.

FIG. 3 is a diagram for describing recording of ECC-blocked data in a predetermined area of the information recording medium of the present invention in sector units.

FIG. 4 shows a DVD as an embodiment of the information recording medium of the present invention.
It is a figure which shows the physical format of one sector in -RW.

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 an embodiment of an information recording medium according to a second embodiment of the present invention.

FIG. 7 is a diagram for explaining an example of a cutting state in the information recording medium.

FIG. 8 is a diagram for explaining another example of a cutting state in the information recording medium.

FIG. 9 is a diagram for explaining a positional relationship between recording and reproduction operations according to the present invention.

FIG. 10 is a diagram for explaining a lead-in area and a data area of the third information recording medium of the present invention.

FIG. 11 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a fourth embodiment of the present invention.

FIG. 12 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a fifth embodiment of the present invention.

FIG. 13 is a diagram for explaining another example of the cutting state in the information recording medium according to the sixth embodiment of the present invention.

FIG. 14 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a sixth embodiment of the present invention.

FIG. 15 is a diagram for explaining the amplitude of a tracking error signal according to a seventh embodiment of the present invention.

[Explanation of symbols]

 PA, PB, PM Pit train P1, P2 Read-only area Area 1 Recording / playback area

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 7/24 565 G11B 7/24 565A 20/10 20/10 H (31) Priority claim number Japanese Patent Application No. 2000 −211615 (P2000−211615) (32) Date of priority July 12, 2000 (July 12, 2000) (33) Country of priority claim Japan (JP) F-term (reference) 5D029 JB42 JB45 WA09 WA17 WA27 WB17 WD16 5D044 AB03 BC06 CC06 DE03 DE17 DE27 DE50 DE54 5D090 AA01 BB04 CC05 DD01 EE07 FF02 FF15 GG09 5D118 AA16 BA04 BB03 BC02 CA13 CB06 CD03

Claims (32)

[Claims] 1. An information recording medium formed of a spiral or concentric information track and comprising a read-only area and an information recordable area, comprising: a recordable area in which a guide groove is formed in the information track; A first read-only area in which one pit row is formed; a second read-only area in which a second pit row is formed; and a first read-only area and a second read-only area. An intermediate region having a third pit row formed therebetween, wherein a bottom face of the first pit row, a bottom face of the second pit row, and the third pit row are on the same plane. Wherein the third pit row in the intermediate area is formed so that the optical depth of the first read-only area is different from the optical depth of the second read-only area. Information recording medium. 2. An information recording medium formed from a spiral or concentric information track and having a read-only area and an information recordable area, wherein: a recordable area having a guide groove formed in the information track; A read-only area in which one pit row is formed; and an intermediate area having a second pit row formed between the recordable area and the read-only area. The bottom surface of the first pit row and the bottom face of the second pit row are on the same plane, and the second pit row in the intermediate area has an optical depth on the recordable area side, An information recording medium characterized by being formed so as to have a different optical depth from a region side. 3. An information recording medium formed of a spiral or concentric information track and comprising a read-only area and an information recordable area, wherein: a recordable area having a guide groove formed in the information track; A first read-only area in which one pit row is formed; a second read-only area in which a second pit row is formed; and a space formed between the recordable area and the first read-only area. A first intermediate area having a third pit row and a second intermediate area having a fourth pit row formed between the first read-only area and the second read-only area; And the bottom of the guide groove, the bottom of the first pit row, the bottom of the second pit row, the bottom of the third pit row, and the bottom of the fourth pit row are on the same plane. And the third row of pits in the first intermediate area is The optical depth on the recordable area side is different from the optical depth on the first read-only area side, and the fourth pit row in the second intermediate area is the optical depth on the first read-only area side. An information recording medium, wherein a depth is different from an optical depth of the second read-only area. 4. An information recording medium formed of a spiral or concentric information track and comprising a read-only area and an information recordable area, wherein: a recordable area having a guide groove formed in said information track; A first read-only area in which one pit row is formed, a second read-only area in which a second pit row is formed, a third read-only area in which a third pit row is formed, A first intermediate area having a fourth pit row formed between the first read-only area and the second read-only area; a second read-only area; and a third read-only area A second intermediate region having a fifth pit row formed between the second pit row and the second pit row; and a bottom surface of the guide groove, a bottom face of the first pit row, a bottom face of the second pit row, The bottom of the third pit row and the bottom of the fourth pit row are the same. The fourth pit row in the first intermediate area is different from the optical depth on the first read-only area side and the optical depth on the second read-only area side. An information recording medium, wherein the fifth pit row in the middle area of the first embodiment has an optical depth different from the optical depth on the second read-only area side and the optical depth on the third read-only area side. 5. The apparatus according to claim 1, wherein the intermediate area, the first intermediate area, or the second intermediate area is an area in which a signal capable of obtaining a tracking error signal in a predetermined method is recorded. The information recording medium according to claim 1. 6. The read-in information of an information recording medium is recorded in at least one of the read-only area, the first read-only area, the second read-only area, and the third read-only area. 5. The information recording medium according to claim 1, wherein the lead-in information includes information on copyright protection. 7. An information recording medium that does not have at least one of the intermediate area, the first intermediate area, and the second intermediate area, and an information recording medium that does not include at least one of the intermediate area, the first intermediate area, and the information processing medium. Identifying information for identifying an information recording medium having at least one of a second intermediate area as the read-only area, the first read-only area, the second read-only area, the third read-only area, 5. The information recording medium according to claim 1, wherein a pit string is recorded in at least one of the recordable areas. 8. An information recording medium according to claim 1, wherein the information recording medium does not have at least one of the intermediate area, the first intermediate area, and the second intermediate area. An identification information reproducing step of recognizing the information from the information on the information recording medium and reproducing the identification information; and the intermediate area, the first intermediate area, or the second intermediate area according to an identification result of the identification information reproducing step. When it is determined that there is no at least one of
The intermediate region, the first intermediate region, or the second
An intermediate area recording step of recording an area corresponding to at least one of the intermediate areas, and the intermediate area, the first intermediate area, or the second
When it is determined that there is at least one of the intermediate areas, a reproducing step of reproducing at least one of the intermediate area, the first intermediate area, and the second intermediate area. Recording method of information recording medium. 9. The information recording medium according to claim 1, wherein the information recording medium does not have at least one of the intermediate area, the first intermediate area, and the second intermediate area. An identification information reproducing step of reproducing the identification information by identifying the information from the information on the information recording medium; and an identification result of the identification information reproducing step, wherein the intermediate area, the first intermediate area, or the second intermediate area When it is determined that at least one is missing,
The intermediate region, the first intermediate region, or the second
An information recording medium, comprising: an intermediate area reproducing step of reproducing at least one of areas corresponding to the intermediate area; and a step of skipping the intermediate area reproducing step when it is determined that the intermediate area exists. How to play. 10. The recording method for an information recording medium according to claim 8, further comprising the step of reproducing the identification information from a control data area or an LPP area of the information recording medium. 11. The method according to claim 9, further comprising the step of reproducing the identification information from a control data area of the information recording medium. 12. An information recordable area of a first depth formed from a spiral or concentric information track, in which a frequency signal and an address signal are recorded in advance from an inner periphery of the information track, and a reproduction signal is provided. A first read-only area having a first optical depth in which a frequency signal and an address signal are recorded in advance as a pit row, and a second optical depth in which a read signal is recorded as a pit row. A read signal is recorded as a pit string between a second read-only area, an information recordable area at the first optical depth and a second read-only area at the second optical depth. A first intermediate area having an optical depth between the first optical depth and the second optical depth; a second read-only area having the second optical depth; 1
Of the optical depth between the first optical depth and the second optical depth where the reproduced signal is recorded as a pit row between the first optical read only area and An information recording medium having two intermediate areas. 13. An information recordable area of a first depth formed from a spiral or concentric information track, in which a frequency signal and an address signal are recorded in advance from an inner periphery of the information track, and a reproduction signal is provided. A second read-only area having a second depth recorded as a pit row, and a first reproduction having a first depth in which a reproduction signal is recorded as a pit row and a frequency signal and an address signal are recorded in advance. A first structure having a dedicated area, and a spiral or concentric information track,
An information recordable area of a first optical depth in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track, and a reproduction signal is recorded as a pit row, and a frequency signal and an address signal are recorded in advance A first read-only area having a first optical depth, a second read-only area having a second optical depth in which a read signal is recorded as a pit row, and the first optical depth. Between the information recordable area and the second read-only area of the second optical depth, where the read signal is recorded as a pit row and the first optical depth and the second optical depth. And a read signal is recorded as pits between a first intermediate area having an optical depth between the first and second areas and a read-only area having the second optical depth and a read-only area having the first optical depth. Said first optical depth and said second optical depth
A second structure having a second intermediate region having an optical depth between the first and second structures, and a region in which information for identifying the first structure and the second structure is recorded. Information recording medium. 14. A first information recordable area which is formed from a spiral or concentric information track, and in which a frequency signal and an address signal are recorded in advance from an inner circumference of the information track, a frequency signal and an address signal. Are recorded as a pit row in which a reproduction signal is readable, and a first reproduction-only area in which an address signal is not recorded, and a pit row in which a reproduction signal is not readable. A second read-only area in which a frequency signal and an address signal are recorded in advance, and an information recordable or read-only area between the first information recordable area and the first read-only area. 1 intermediate area, and a second intermediate area between the first read-only area and the second read-only area, in which a read signal is recorded as a pit string. Information recording medium. 15. A first information recordable area formed of a spiral or concentric information track, in which a frequency signal and an address signal are recorded in advance from an inner periphery of the information track, and a reproduction signal can be read out. A first read-only area recorded as a pit string and no address signal is recorded, and a second pit string in which a frequency signal and an address signal are previously recorded as a pit string from which a reproduced signal cannot be read.
A first structure having a read-only area, a second information recordable area in which a frequency signal and an address signal are recorded in advance, and a spiral or concentric information track,
A first information recordable area in which a frequency signal and an address signal are recorded in advance from the inner circumference of the information track, a second information recordable area in which a frequency signal and an address signal are recorded in advance, and a reproduction signal. A first read-only area recorded as a readable pit row and no address signal is recorded, and a second read-only area where a reproduced signal is not readable and a second pit row previously recorded with a frequency signal and an address signal A read-only area, a first intermediate area between the first information recordable area and the first read-only area, which is an information recordable or read-only area, the first read-only area, Identifying a second structure having a second intermediate region between the second reproduction-only region and a reproduction signal recorded as a pit string; and the first structure and the second structure. An information recording medium having an area on which information is recorded. 16. A first information recordable area which is formed from a spiral or concentric information track and in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track, and a frequency signal and an address signal. Are recorded as a pit string in which a reproduction signal is readable, and a first reproduction-only area in which an address signal is not recorded, and a pit in which a reproduction signal is not readable. A second read-only area in which a frequency signal and an address signal are recorded in advance, and an information recordable or read-only area between the first information recordable area and the first read-only area. A first intermediate area in which a frequency signal and an address signal are recorded in advance;
A reproduction signal is provided in a pit between the first reproduction-only area and the second reproduction-only area, and has a second intermediate area in which a frequency signal and an address signal are recorded in advance. Structure and formed from spiral or concentric information tracks,
A first information recordable area in which a frequency signal and an address signal are recorded in advance from the inner circumference of the information track, a second information recordable area in which a frequency signal and an address signal are recorded in advance, and a reproduction signal. A first read-only area in which an address signal recorded as a readable pit is not recorded, and a second reproduction in which a pit is recorded in which a read signal is not readable and a frequency signal and an address signal are recorded in advance. A dedicated area, a first intermediate area, which is a read-only area between the first information recordable area and the first read-only area, the first read-only area, and the second read-only area.
And a second intermediate area between the read-only area and a read-only area, in which a reproduced signal is recorded as a pit string. 17. The information recording medium according to claim 16, further comprising an area in which information for identifying said first structure and said second structure is recorded. 18. The information recording medium according to claim 16, wherein a frequency signal is recorded in advance in at least one of said first intermediate area and said second intermediate area. 19. A first information recordable area which is formed from a spiral or concentric information track, and in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track, a frequency signal and an address signal And a first read-only area in which a frequency signal recorded as a pit string from which a reproduction signal is readable is recorded, and a pit string from which a reproduction signal is not readable. A second read-only area in which a frequency signal and an address signal are recorded and recorded in advance, and an information recordable or read-only area between the first information recordable area and the first read-only area. A reproduction signal is recorded as a pit row between a first intermediate area, the first reproduction-only area, and the second reproduction-only area, and a frequency signal is previously recorded. Information recording medium and a second intermediate region being recorded. 20. An information recording medium having the intermediate area according to claim 13 and an information recording medium having no intermediate area are identified from information on the information recording medium. An identification information reproducing step of reproducing identification information; an intermediate area recording step of recording an area corresponding to the intermediate area when it is determined that there is no intermediate area based on an identification result of the identification information reproducing step; A reproducing step of reproducing the intermediate area when it is determined that there is an area, the recording method for an information recording medium. 21. An information recording medium having said intermediate area and an information recording medium not having said intermediate area according to claim 13 are identified from information on said information recording medium. An identification information reproducing step of reproducing information; an intermediate area reproducing step of reproducing an area corresponding to the intermediate area when it is determined that the intermediate area does not exist based on an identification result of the identification information reproducing step; And a step of skipping the step of reproducing the intermediate area when it is determined that there is an information recording medium. 22. A recording method for an information recording medium according to claim 20, comprising a step of reproducing said identification information from a control data area or an LPP area of said information recording medium. Media playback method. 23. A first information recordable area which is formed from a spiral or concentric information track and in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track, a frequency signal and an address signal in advance. Is recorded as a second information recordable area, a first read-only area in which a frequency signal recorded as a pit from which a reproduction signal is readable, and a pit from which a reproduction signal is not readable. A second read-only area in which a frequency signal and an address signal are recorded in advance, and an information recordable area between the first information recordable area and the first read-only area, at least A first intermediate area in which a frequency signal is recorded in advance; and a first reproduction-only area and a second reproduction-only area, wherein the reproduction signal is a pit. To be recorded, the information recording medium and a second intermediate region at least in advance frequency signal is recorded. 24. A first information recordable area which is formed from a spiral or concentric information track, and in which a frequency signal and an address signal are recorded in advance from the inner circumference of the information track, a frequency signal and an address signal. Are recorded as pits from which a reproduction signal can be read, and a first read-only area in which an address signal is not recorded, and pits from which a reproduction signal cannot be read. A reproduction signal is recorded as a pit between the first reproduction-only area and the second reproduction-only area, in which a frequency signal and an address signal are previously recorded, and And a first intermediate area in which an address and an address signal are recorded, and between the first information recordable area and the first read-only area. A band, formed from a first structure comprising a pre-frequency signal and the second intermediate region address signal and is recorded, a spiral or concentric information tracks,
A first information recordable area in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track; a second information recordable area in which a frequency signal and an address signal are recorded in advance; The signal is recorded as a readable pit, and the first signal is recorded with a frequency signal.
A read-only area, a second read-only area recorded as pits from which a read signal cannot be read, and a frequency signal and an address signal previously recorded, the first information recordable area, and the first read A third intermediate area, in which at least a frequency signal is recorded in advance, between the first read-only area and the second read-only area. And a fourth intermediate area in which a signal is recorded as a pit and at least a frequency signal is recorded in advance. 25. The information recording medium according to claim 24, further comprising an area in which information for identifying said first structure and said second structure is recorded in a control data area or an LPP area. 26. An information recording medium having the first structure and an information recording medium having the second structure according to claim 24, wherein the information recording medium has the first structure. And a recording step of recording according to the intermediate area corresponding to the structure identified by the identification step. 27. An information recording medium having the first structure and an information recording medium having the second structure according to claim 24 or 25, An identification step of reproducing identification information that is identified from the following; an intermediate area reproduction step of reproducing an area corresponding to the intermediate area when the first structure is determined by the identification step; and a determination of the second structure. A step of skipping the reproduction signal of the intermediate area or skipping a reproduction step of the intermediate area when the reproduction is performed. 28. The method according to claim 26, further comprising the step of reproducing the identification information from a control data area or an LPP area of the information recording medium. 29. A first information recordable portion which is formed from a spiral or concentric information track, in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track and a tracking error signal in a predetermined range is obtained. An area, a second information recordable area in which a frequency signal and an address signal are recorded in advance and a tracking error signal in a predetermined range is obtained, and a frequency signal recorded as a pit from which a reproduction signal is readable is recorded and a predetermined area is recorded. And a first read-only area in which a tracking error signal in a range is obtained, and a pit in which a reproduction signal is not readable, a frequency signal and an address signal are recorded in advance, and a tracking error signal in a predetermined range is obtained. 2; a read-only area; and a boundary between the first information recordable area and the first read-only area. An information recording medium having a near area and an area near a boundary between the first read-only area and the second read-only area, where a tracking error signal is obtained outside the predetermined range; . 30. An identification step of reproducing identification information for identifying an information recording medium having the structure according to claim 29 from information on the information recording medium, and corresponds to the structure identified by the identification step. Determining, from the address information, an area in which the tracking error signal is obtained in the predetermined range and an area in which the tracking error signal is obtained outside the predetermined range; and in each of the areas, a tracking control method is changed. A recording step of performing a recording process by using a recording method for an information recording medium. 31. An identification step for reproducing identification information for identifying an information recording medium having the structure according to claim 29 from information on the information recording medium, and the information corresponds to the structure identified by the identification step. Judging, from address information, an area where a tracking error signal is obtained in the predetermined range and an area where a tracking error signal is obtained outside the predetermined range; and in each of the areas, a reproduction control method is changed. And a reproducing step of performing a reproducing process by using the information recording medium. 32. A method for reproducing an information recording medium according to claim 31, further comprising the step of skipping a reproduction signal in a region where a tracking error signal outside said predetermined range is obtained.