JPH09231576A - optical disk - Google Patents

Abstract

(57) Abstract: The present invention is intended to solve the problem that the efficiency is poor due to a mistake in determining the actual optimum recording power in the ZCLV method. According to the present invention, a recording area 20 capable of recording / reproducing information or recording / reproducing / erasing information is divided into a plurality of annular zones 21, and a rotational angular velocity is kept constant in each of the zones 21. Moreover, the data rate is kept constant over the entire circumference, and information is recorded / reproduced in ZC.
An optical disc on which information is recorded / reproduced by the LV system is provided with a pre-format section in which information of optimum recording power for each zone 21 is recorded.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a ZCLV system and a ZC system.
The present invention relates to an optical disc on which information is recorded by the AV method.

[0002]

2. Description of the Related Art CAV (Const) is a method for recording / reproducing information on / from an optical disk by an optical disk device.
ant Angular Velocity) method, C
LV (Constant Linear Veloci)
ty) method, ZCAV (Zone CAV) method, ZC
A method such as an LV (Zone CLV) method is known.

In the CAV system, an optical disk is arranged radially with address areas 11 and data areas 12 aligned in a radial direction along a track 10, as shown in FIG. The optical disk device in which this optical disk is set,
As shown in FIGS. 5 (a) and 5 (b), when data is recorded / reproduced on / from the optical disc, the optical disc is rotated at a constant rotation speed over the entire circumference, and the data rate is constant over the entire circumference of the optical disc. . For this reason, FIG.
As shown in (4), the recording pit length on the optical disc becomes longer and the recording density decreases as it goes to the outer periphery of the optical disc.

In the CLV system, as shown in FIG. 6, the optical disc is arranged without address areas 11 and data areas 12 being aligned in the radial direction. The optical disk device in which this optical disk is set has the same linear velocity as shown in FIG.
As shown in (b), the optical disk is rotated so that the number of rotations decreases in proportion to its radial position, and the data rate is constant over the entire circumference of the optical disk. Therefore, as shown in FIG. 7C, the recording pit length on the optical disc is constant over the entire circumference of the optical disc. Therefore, the recording capacity of the optical disk is larger in the CLV method than in the CAV method.

ZC improved from CAV method and CLV method
In the AV system and the ZCLV system, as shown in FIG. 1, an optical disk has an annular recording area 20 composed of spiral or concentric tracks, which is divided into a plurality of zones 21 in the radial direction. Data is recorded so that the recording pit length becomes longer toward the outer circumference. Further, in the ZCAV system and the ZCLV system, the address area 11 and the data area 12 are aligned in the radial direction in the zone 21 of the optical disc.

In the ZCAV system, the optical disk apparatus rotates the optical disk at a constant rotation speed as shown in FIG. 2A, and as shown in FIG. 2B, the data rate of each zone of the optical disk. Is made higher in steps toward the outer circumference of the optical disc than in the CAV method. Therefore, as shown in FIG. 2C, the recording pit length in each zone of the optical disk is shorter than that in the CAV system and is maintained in a substantially constant range.

In the ZCLV system, the optical disk device rotates the optical disk so that it is constant for each zone and gradually lowers toward the outer circumference of the optical disk as shown in FIG. ), The data rate is constant over the entire circumference. Therefore, the recording pit length is shorter than that of the CAV method and is kept substantially constant as shown in FIG. Therefore, in the ZCAV system and the ZCLV system, the recording capacity of the optical disc is larger than that in the CAV system, and the surface area utilization efficiency of the optical disc is high.

In Japanese Unexamined Patent Publication No. 7-114733, an annular recording area composed of a plurality of concentric circular or spiral recording tracks carrying an information signal including a synchronization signal is divided into a plurality of zones by an annular boundary area. In the divided optical disk, the recording track is composed of a plurality of sectors including servo areas, the servo areas are located on the same straight line in the radial direction, and the track pitch of the boundary area is the zone. An optical disc is described which is characterized by being larger than the inner track pitch.

Japanese Unexamined Patent Publication No. 7-1218878 is characterized in that, in an optical disk device that records on both the land and the groove of the optical disk, the optical output at the time of recording is set to different values for the land and the groove. An optical disk device is described. In addition, OPC (Optimum
As a conventional technique related to Power Control, there is Orange Book PART2. This is CD-
OPC is performed by using the information of the optimum recording power (recommended recording power) recorded in the special information of the innermost peripheral portion of the CD-R, which is the standard of R.

That is, in the CD-R, before recording information, a PCA (Power Calibration) is used.
Area), the actual optimum recording power is determined by performing OPC with the optimum recording power (recommended recording power) recorded in the special information of the innermost peripheral portion as the center value. CD-R is C
The LV system.

[0011]

DISCLOSURE OF THE INVENTION CLV system CD-R
As a method for further increasing the recording density of the optical disc, ZC is used.
There are AV system and ZCLV system. In the ZCLV method, the optical disc has different rotational angular velocities for each zone.
The recording power is different for each zone. Therefore, the optical disc needs to perform OPC for each zone like a CD-R, but if the OPC for each zone is performed with one optimum recording power (recommended recording power) as the center value, As a result, there is a large difference between the optimum recording power (recommended recording power) and the actual optimum recording power, and a mistake occurs when determining the actual optimum recording power, or the actual optimum recording power cannot be determined at once. As for the frequency, it is necessary to determine the actual optimum recording power.

It is an object of the present invention to provide an optical disk which makes it possible to efficiently determine the actual optimum recording power in the ZCLV system without causing a mistake in determining the actual optimum recording power.

[0013]

In order to achieve the above object, the invention according to claim 1 divides a recording area capable of recording / reproducing information or recording / reproducing / erasing information into a plurality of annular zones. In the optical disc in which information is recorded / reproduced by the ZCLV method, in which the rotational angular velocity is kept constant in each of the zones and the data rate is kept constant over the entire circumference, the information is recorded / reproduced by the ZCLV system. Since the pre-format section in which the information of the optimum recording power is recorded is provided, it is possible to efficiently determine the actual optimum recording power by the ZCLV method without making a mistake in determining the actual optimum recording power. It will be possible.

According to a second aspect of the present invention, a recording area capable of recording / reproducing information or recording / reproducing / erasing information is divided into a plurality of annular zones, and the rotational angular velocity is constant in each of the plurality of zones. In the optical disc in which the information is recorded / reproduced in each of the land and the groove by the ZCLV method in which the information is recorded / reproduced by keeping the data rate constant over the entire circumference, The optical disc is equipped with a pre-format section in which information of the optimum recording power of each groove is recorded, and the actual optimum recording power of an optical disk in which information is recorded / reproduced in each of the land and the groove by the ZCLV method. It is possible to efficiently determine the actual optimum recording power without causing a determination error.

According to a third aspect of the invention, in an optical disc in which a recording area capable of recording / reproducing information or recording / reproducing / erasing information is divided into a plurality of annular zones, the rotational angular velocity is in each of the zones. Information about the optimum recording power for each zone when information is recorded by the ZCLV method in which information is recorded / reproduced while being kept constant and the data rate is kept constant over the entire circumference, and rotation is performed over the entire circumference. The angular velocity is kept constant and the data rate is kept constant in each of the zones to record information.
A pre-format section is provided in which information on the optimum recording power for each zone is recorded for both information on the optimum recording power for each zone when information is recorded by the ZCAV system for reproduction. Therefore, it is possible to support both the ZCLV system and the ZCAV system, and it is possible to efficiently determine the actual optimum recording power without making a mistake in determining the actual optimum recording power.

According to a fourth aspect of the present invention, a recording area in which information can be recorded / reproduced or information can be recorded / reproduced / erased is divided into a plurality of annular zones, and information can be recorded / reproduced in each of the land and the groove. In the optical disc where
Optimal recording power for each zone when information is recorded by the ZCLV system in which the rotational angular velocity is kept constant in each of the zones and the data rate is kept constant over the entire circumference to record / reproduce information. And the information about the zone and the rotational angular velocity is kept constant over the entire circumference and the data rate is kept constant in each of the zones to record / reproduce the information. The optimum recording power information for both the land and the groove for each zone is provided with a pre-format section in which the optimum recording power information is recorded. ZCL on the optical disc to be played
It is possible to support both the V system and the ZCAV system, and it is possible to efficiently determine the actual optimum recording power without causing a mistake in determining the actual optimum recording power.

The invention according to claim 5 relates to claims 1, 2, 3
Alternatively, in the optical disc described in the item 4, the information of the optimum recording power for each zone is collectively put in a specific position, and it is efficient when the OPC of each zone is collectively performed.

The invention according to claim 6 relates to claim 1, 2, 3
Alternatively, in the optical disc described in the item 4, the information on the optimum recording power for each zone is entered only in the zone, and the information on the optimum recording power can be efficiently read.

The invention according to claim 7 relates to claim 1, 2, 3
Alternatively, in the optical disc described in the item 4, the information of the optimum recording power for each zone is put only in the zone, and the information of the optimum recording power of all the zones is collectively put in a specific position. OPC of each zone
It becomes possible to read the information of the optimum recording power efficiently and efficiently.

The invention according to claim 8 relates to claim 1, 2, 3
Alternatively, in the optical disc described in the item 4, the information of the optimum recording power for each zone is put in all the zones, which simplifies the data processing at the time of forming the preformat portion.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The method of recording information on an optical disk of the invention according to each claim is a phase change recording method, a magneto-optical recording method, line once recording (Writ) using a material such as a dye.
e Once: hole recording) method, or any other recording method. In addition, as a method of recording information in the pre-formatted portion of the optical disc of the invention according to each claim, any of a pre-pit recording system, a wobble signal recording system on a track, a recording system after optical disc preparation, and other recording systems are available. But it's okay.

An optical disk according to an embodiment of the present invention is an optical disk as shown in FIG. 1 in which information is recorded by a phase change recording device by a phase change recording method, that is, recording / reproduction of information. Alternatively, the recording area 20 in which information can be recorded / reproduced / erased is divided into a plurality of annular zones 21, and the address areas 11 and the data areas 12 are radially aligned along the track 10 for each zone 21. 3A, the rotation angular velocity is constant in each of the zones 21 as shown in FIG. 3A, and is gradually decreased toward the outer circumference of the optical disc, and the data rate over the entire circumference of the optical disc is shown in FIG. Since the information is recorded / reproduced while being kept constant as shown in b), the recording pit length is shorter than that of the CAV system as shown in FIG. Recording and reproducing information with ZCLV scheme is kept constant is an optical disc to be performed.

In this optical disc, the recording area 20 is divided into, for example, 20 zones 21, and information on the optimum recording power (recommended recording power) of each zone 21 is a special format of the pre-format portion in the innermost peripheral portion of each zone 21. It is recorded in the information by pre-pit. When the optical disc of the present embodiment is set, the optical disc device executes OPC for each zone 21 of the optical disc,
After reading the information of the optimum recording power (recommended recording power) recorded in the special information of the pre-format section in the innermost part of each zone 21, before the information is recorded, the innermost part of the PCA is recorded. O around the optimum recording power (recommended recording power) recorded in the special information of the section
The actual optimum recording power is determined by performing the PC.

As described above, this embodiment is an embodiment of the invention according to claim 1, and the recording area 20 capable of recording / reproducing information or recording / reproducing / erasing information has a plurality of annular shapes. It is divided into zones 21, the rotational angular velocity is kept constant in each of the zones 21, and the data rate is kept constant over the entire circumference of the optical disc.
Since the optical disc on which information is recorded / reproduced by the ZCLV system for reproduction is provided with the pre-format section in which the information of the optimum recording power for each zone 21 is recorded, the actual optimum recording power of the ZCLV system is not recorded. It is possible to efficiently determine the actual optimum recording power without causing a determination error.

Further, this embodiment is an embodiment of the invention according to claim 6, and in the optical disc according to claim 1, information of the optimum recording power for each zone 21 is entered only in the zone. Therefore, the information of the optimum recording power can be efficiently read.

An optical disk according to an embodiment of the present invention according to claims 2, 5, and 7 is an optical disk as shown in FIG. 1 in which information is recorded on a land and a groove by a magneto-optical recording apparatus by a magneto-optical recording system, that is, A recording area 20 in which information can be recorded / reproduced or information can be recorded / reproduced / erased is divided into a plurality of annular zones 21, and an address area 11 and a data area 12 are radially formed along the track 10 for each zone 21. Are arranged in a radial pattern and are rotated in such a manner that the rotational angular velocity is constant in each zone 21 as shown in FIG. The data rate is kept constant as shown in FIG. 3 (b), and recording / reproducing of information is performed on each of the land and the groove. Pit length is an optical disk recording and reproducing information with ZCLV system is kept substantially constant shorter than the CAV method as shown in FIG. 3 (c) is performed in each of the land and groove.

In this optical disc, the recording area 20 is divided into, for example, 10 zones 21, and information on the optimum recording power (recommended recording power) of each land and groove for each zone 21 is recorded in the innermost peripheral portion of each zone 21. And prepits are recorded in the special information of the preformat section in the innermost circumference of the optical disc. When the optical disk of the present embodiment is set, the optical disk device executes OPC for each zone 21 and uses the special information of the pre-format section in the innermost part of each zone 21 or the innermost part of the optical disk. After reading the information of the optimum recording power (recommended recording power) of each land and groove of each zone 21 which has been recorded, before recording the information, the innermost peripheral portion of the PCA or the innermost peripheral portion of the optical disc is recorded. Determining the actual optimum recording power by performing OPC on the land or groove of each zone 21 centering on the optimum recording power (recommended recording power) of each zone 21 recorded in the special information. I do.

As described above, this embodiment is an embodiment of the invention according to claim 2, and the recording area 20 capable of recording / reproducing information or recording / reproducing / erasing information has a plurality of annular shapes. Each of the land and groove is divided into zones 21 by the ZCLV method in which the rotational angular velocity is kept constant in each of the plurality of zones 21 and the data rate is kept constant over the entire circumference of the optical disc to record and reproduce information. In the optical disc on which information is recorded / reproduced, since the pre-format section in which the information of the optimum recording power of each of the land and the groove of each zone 21 is recorded, the land and the groove of the ZCLV system are recorded. For optical discs on which information is recorded / reproduced, the actual optimum recording power can be realized efficiently without making a mistake. It is possible to determine the optimum recording power.

Further, this embodiment is an embodiment of the invention according to claim 5, and in the optical disk according to claim 2, the information of the optimum recording power for each zone 21 is provided at a specific position (the innermost part of the optical disk). Since it is put all together in the (peripheral portion), it is efficient when performing OPC for each zone all at once.

Further, this embodiment is an embodiment of the invention according to claim 7, and in the optical disc according to claim 2, information of the optimum recording power for each zone 21 is provided in the innermost peripheral portion of the zone. Since the optimum recording power information of all the zones is collectively stored at a specific position (the innermost circumference of the optical disc), the O of each zone is collectively recorded.
When performing the PC, the information of the optimum recording power can be read efficiently and efficiently.

An optical disk according to an embodiment of the invention as claimed in claims 3 to 5 is a write-once type optical disk using a dye as a recording material, and recording / reproducing (or reproducing of information) information to / from each land and groove. An optical disc as shown in FIG. 1 capable of recording / reproducing / erasing, that is, a recording area 20 capable of recording / reproducing information or recording / reproducing / erasing information has a plurality of annular zones 21.
And the address areas 11 and the data areas 12 are radially arranged along the track 10 in each zone 21 so that the rotational angular velocity is in each zone 21 as shown in FIG. 3A. It is rotated so that it gradually decreases toward the outer circumference of the optical disc, and the data rate is kept constant over the entire circumference of the optical disc as shown in FIG. By carrying out each of them, recording / reproducing of information is carried out on each of the land and the groove by the ZCLV system in which the recording pit length is shorter than the CAV system and kept substantially constant as shown in FIG. 3C. Further, the optical disc is rotated at a constant rotation speed over the entire circumference of the optical disc, and the data rate of each zone 21 is higher than that of the CAV system as shown in FIG. Since recording / reproducing of information is performed step by step toward the circumference and recording / reproducing of information is performed on each of the land and the groove, the recording pit length in each zone of the optical disc is larger than that in the CAV method as shown in FIG. It is an optical disc on which information is recorded by the ZCAV method, which is short and kept in a substantially constant range.

In this optical disc, the recording area 20 is divided into, for example, 10 zones 21, and the optimum recording power (recommended recording power) of each land and groove for each zone when information is recorded by the ZCLV method. For both the information and the optimum recording power information of the land and the groove for each zone when the information is recorded by the ZCAV method, the optimum recording power information of the land and the groove for each zone is the maximum of the optical disc. It is recorded by the wobble signal of the track in the special information of the pre-format portion in the inner peripheral portion. When the optical disk of the present embodiment is set, the optical disk device executes OPC for each zone 21, and in each zone 21, the ZCLV recorded in the special information of the preformat section in the innermost circumference of the optical disk is set. Information of the optimum recording power (recommended recording power) of each land and groove for each zone when information is recorded by the method, and land and groove for each zone when information is recorded by the ZCAV method Optimal recording of the land or groove of each zone 21 recorded in the special information of the innermost peripheral portion of the optical disc in the PCA after reading both the information of the respective optimum recording power and before recording the information. The power (recommended recording power) is the center value and the OPC is The determination of actual optimum recording power by performing the land or groove of Action 21.

As described above, this embodiment is an embodiment of the invention according to claim 3, and the recording area 20 capable of recording / reproducing information or recording / reproducing / erasing information has a plurality of annular shapes. In the optical disc divided into zones 21,
For each zone 21 when information is recorded by the ZCLV system in which the rotational angular velocity is kept constant in each of the zones 21 and the data rate is kept constant over the entire circumference of the optical disc, the information is recorded and reproduced. Information of the optimum recording power and information is recorded by the ZCAV method in which the rotational angular velocity is kept constant over the entire circumference of the optical disc and the data rate is kept constant in each of the zones 21 to record / reproduce information. At this time, since the pre-format section in which the optimum recording power information for each zone 21 and the optimum recording power information for each zone 21 are recorded, it is possible to support both the ZCLV system and the ZCAV system. It is possible to efficiently determine the actual optimum recording power without making a mistake in determining the optimum recording power.

Further, this embodiment is an embodiment of the invention according to claim 4, in which a recording area 20 capable of recording / reproducing information or recording / reproducing / erasing information has a plurality of annular zones 21. In an optical disc which is divided into two parts and information is recorded / reproduced in each of the land and the groove, the angular velocity of rotation is kept constant in each of the zones 21 and the data rate is kept constant over the entire circumference of the optical disc to record information. Information on the optimum recording power for each zone 21 when information is recorded by the ZCLV system for reproduction, the rotation angular velocity is kept constant over the entire circumference of the optical disc, and the data rate is constant in each zone 21. Z is used to record and reproduce information
The zone 2 when information is recorded by the CAV method
Since the pre-formatted portion in which the optimum recording power information of each land and the groove of each zone 21 is recorded for both the optimum recording power information of each one, the information is recorded in each of the land and the groove. It is possible to support both the ZCLV system and the ZCAV system in the optical disc to be played back, and it is possible to efficiently determine the actual optimum recording power without making a mistake in determining the actual optimum recording power.

Further, this embodiment is an embodiment of the invention according to claim 5, and in the optical disc according to claim 4, the information of the optimum recording power for each zone 21 is provided at a specific position (the innermost portion of the optical disc). Since it is put all together in the (peripheral portion), it is efficient when performing OPC for each zone all at once.

In addition, in one embodiment of the inventions according to claims 1 and 6, the invention according to claim 5 is applied to obtain information on the optimum recording power for each zone 21 at a specific position (innermost portion of the optical disc). It is possible to put them all at once. Further, in one embodiment of the invention according to claims 2, 5, and 7 or one embodiment of the invention according to claims 3 to 5, the invention according to claim 6 is applied to optimize the optimum recording power for each zone 21. It is also possible to put the information of (3) in each zone only.

Further, in one embodiment of the invention according to claims 1 and 6 or one embodiment of the invention according to claims 3 to 5, the invention according to claim 7 is applied to optimize the optimum recording power for each zone 21. It is also possible to put the information of 1) only in the innermost peripheral portion of the zone, and further put the information of the optimum recording power of all the zones at a specific position (the innermost peripheral portion of the optical disc) at once. An embodiment of the invention according to claim 8 is such that, in each of the above-mentioned embodiments, the information of the optimum recording power for each zone 21 is put into all the zones.
Simplifies the data processing when creating the preformat section.

[0038]

As described above, according to the first aspect of the invention, the recording area in which information can be recorded / reproduced or information can be recorded / reproduced / erased is divided into a plurality of annular zones, and the rotational angular velocity is Optimal recording power for each zone in an optical disc in which information is recorded / reproduced by the ZCLV system in which information is recorded / reproduced while being kept constant in each of the zones and a constant data rate over the entire circumference. Since the pre-format section in which the information of (1) is recorded is provided, it is possible to efficiently determine the actual optimum recording power by the ZCLV method without causing a mistake in determining the actual optimum recording power.

According to the second aspect of the invention, the recording area in which information can be recorded / reproduced or information can be recorded / reproduced / erased is divided into a plurality of annular zones, and the rotational angular velocity of each of the plurality of zones is different. In the optical disc in which the information is recorded / reproduced in each of the land and the groove by the ZCLV method in which the information is recorded / reproduced by keeping the data rate constant over the entire circumference of the optical disc, Since the pre-format section in which the information of the optimum recording power of each of the land and the groove is recorded, the actual optimum recording power of the optical disk in which the information is recorded / reproduced on each of the land and the groove by the ZCLV method. It is possible to efficiently determine the actual optimum recording power without causing a mistake in determining.

According to the third aspect of the invention, in an optical disc in which a recording area capable of recording / reproducing information or recording / reproducing / erasing information is divided into a plurality of annular zones, the angular velocity of rotation is within the zone. Information on the optimum recording power for each zone when information is recorded by the ZCLV method in which information is recorded / reproduced while being kept constant in each and the data rate is kept constant over the entire circumference, Information of optimum recording power for each zone when information is recorded by the ZCAV system in which the rotational angular velocity is kept constant and the data rate is kept constant in each of the zones for information recording and reproduction. Since the pre-format section in which the information of the optimum recording power for each zone is recorded for both
It is possible to support both the V system and the ZCAV system, and it is possible to efficiently determine the actual optimum recording power without causing a mistake in determining the actual optimum recording power.

According to the invention of claim 4, the recording area in which information can be recorded / reproduced or information can be recorded / reproduced / erased is divided into a plurality of annular zones, and information can be recorded in each of the land and the groove. When the information is recorded by the ZCLV method in which the angular velocity of rotation is kept constant in each of the zones and the data rate is kept constant over the entire circumference in the optical disc to be reproduced, where the information is recorded and reproduced. Information of the optimum recording power for each zone, and information recording by the ZCAV system in which the rotational angular velocity is kept constant over the entire circumference and the data rate is kept constant in each of the zones for information recording / reproduction. The optimum recording power of each land and groove for each zone is recorded for both the optimum recording power information for each zone. Because with a preformat portion in which information of the over has been recorded, ZCL in an optical disk recording and reproducing of information on each of the lands and grooves are carried out
It is possible to support both the V system and the ZCAV system, and it is possible to efficiently determine the actual optimum recording power without causing a mistake in determining the actual optimum recording power.

According to the invention of claim 5, claim 1,
In the optical discs described in 2, 3, or 4, since the information of the optimum recording power for each zone is put in a specific position in a lump, it is efficient when the OPC of each zone is performed in a lump.

According to the invention of claim 6, claim 1,
In the optical discs described in 2, 3, or 4, the information on the optimum recording power for each zone is entered only in the zone, so that the information on the optimum recording power can be efficiently read.

According to the invention of claim 7, claim 1,
In the optical discs described in 2, 3, or 4, since the optimum recording power information for each zone is entered only in that zone, and the optimum recording power information for all the zones is collectively entered in a specific position. And OP of each zone
When C is performed, the efficiency is high, and the information of the optimum recording power can be efficiently read.

According to the invention of claim 8, claim 1,
In the optical discs described in 2, 3, or 4, since the information of the optimum recording power for each zone is put in all the zones, the data processing at the time of forming the preformat portion becomes simple.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of a ZCAV type optical disc and a ZCLV type optical disc.

FIG. 2 is a characteristic diagram showing an optical disc, a data rate, and a recording pit length with respect to a radial position of a ZCAV type optical disc.

FIG. 3 is a characteristic diagram showing an optical disc, a data rate, and a recording pit length with respect to a radial position of a ZCLV type optical disc.

FIG. 4 is a plan view showing a part of a CAV type optical disc.

FIG. 5 is a characteristic diagram showing an optical disc, a data rate, and a recording pit length with respect to a radial position of a CAV type optical disc.

FIG. 6 is a plan view showing a part of a CLV type optical disc.

FIG. 7 is a characteristic diagram showing an optical disc, a data rate, and a recording pit length with respect to a radial position of a CLV system optical disc.

[Explanation of symbols]

 10 tracks 11 address area 12 data area 20 recording area 21 zone

Claims (8)

[Claims] 1. A recording area in which information can be recorded / reproduced or information can be recorded / reproduced / erased is divided into a plurality of annular zones, the rotational angular velocity is kept constant in each of the zones, and data is provided over the entire circumference. Information is recorded / reproduced by the ZCLV system in which the rate is kept constant and information is recorded / reproduced.
An optical disc to be reproduced is provided with a pre-format section in which information on the optimum recording power for each zone is recorded. 2. A recording area in which information can be recorded / reproduced or information can be recorded / reproduced / erased is divided into a plurality of annular zones, and the rotational angular velocity can be kept constant in each of the plurality of zones and the entire circumference. In an optical disc in which information is recorded / reproduced in each land and groove by the ZCLV method in which data is recorded / reproduced while the data rate is kept constant, the optimum for each land and groove for each zone. An optical disc comprising a pre-format section in which recording power information is recorded. 3. An optical disc in which a recording area in which information can be recorded / reproduced or information can be recorded / reproduced / erased is divided into a plurality of annular zones, and the rotational angular velocity is kept constant in each of the zones, ZCL for recording / reproducing information with a constant data rate over the entire circumference
The information of the optimum recording power for each zone when the information is recorded by the V system and the recording of the information such that the rotation angular velocity is kept constant over the entire circumference and the data rate is kept constant in each zone. ZCAV to be played
An optical disc comprising a pre-format section in which information on the optimum recording power for each zone is recorded both for information on the optimum recording power for each zone when information is recorded by the method. 4. An optical disc in which a recording area capable of recording / reproducing information or recording / reproducing / erasing information is divided into a plurality of annular zones, and information is recorded / reproduced in each of a land and a groove. The rotational angular velocity is kept constant in each of the zones and the data rate is kept constant over the entire circumference to record / reproduce information.
Information on the optimum recording power for each zone when information is recorded by the CLV system, and the recording of information by keeping the rotation angular velocity constant over the entire circumference and keeping the data rate constant in each of the zones. ZC to be played
A pre-format portion is provided in which information on the optimum recording power of each land and groove for each zone is recorded both for the information on the optimum recording power for each zone when information is recorded by the AV system. An optical disc characterized in that. 5. The optical disc according to claim 1, 2, 3 or 4, wherein the information of the optimum recording power for each zone is collectively put in a specific position. 6. The optical disk according to claim 1, 2, 3 or 4, wherein information on the optimum recording power for each zone is entered only in that zone. 7. The optical disc according to claim 1, 2, 3 or 4, wherein the information of the optimum recording power for each zone is entered only in the zone, and the information of the optimum recording power of all zones is set at a specific position. An optical disc characterized by being put together in 8. The optical disc according to claim 1, 2, 3 or 4, wherein information on the optimum recording power for each zone is included in all zones.