JPH0757272A - Information recording medium and information recording device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to realize a new application of the land / groove recording method by reducing the number of premarks and crosstalk of the premarks which are time-consuming to manufacture. To do. According to the present invention, land portions L1, L2, L3 ... And groove portions G1, G formed by tracks are formed.
In the information recording medium that records and / or reproduces information on both of 2, 2, G3, ..., Land portions L1, L2, L3 ,.
The pre-formatted portion is formed on only one of the groove portions G1, G2, G3, ....

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium such as an optical disk and a magneto-optical disk and an information recording apparatus.

[0002]

2. Description of the Related Art FIG. 9 shows a structure of a general optical disk and a part of an optical disk device. The light emitted from the semiconductor laser 11 is collimated by the collimator lens 12, is reflected by the beam splitter 13 and the polarization prism 14, and is incident on the objective lens 15.
A minute light spot is formed on the recording surface 18 via the, and the data 20 on the groove portion 19 is reproduced, recorded, or erased.

The light reflected by the optical disk 16 passes through the objective lens 15 and the polarization prism 14 and the beam splitter 13, is converted into condensed light by the condenser lens 21, and astigmatism is generated by the cylindrical lens 22. It is incident on the photodetector 23. The focus error signal and the track error signal for controlling the objective lens 15 in the focusing direction and the tracking direction are known astigmatism methods,
A recording surface is detected by a circuit (not shown) from the output signal of the photodetector 23 by the push-pull method, and the focus actuator and the tracking actuator move the objective lens 15 in the focusing direction and the tracking direction by the focus error signal and the track error signal. Focusing the light spot on 18,
Tracking is done.

FIG. 10 shows the appearance of the optical disc 16. The optical disk 16 has tracks formed in a spiral shape or a concentric shape, and a track for one round is divided into a plurality of sectors 24. The head portion (header portion) of each sector 24 has a pre-formatted area (pre-formatted area). There is a format section) 25.

FIG. 11 shows a preformat section of a general optical disc. In FIG. 11, the numerical value under the name represents the number of bytes, and one byte has a 16-channel bit length. Track number (Track No.), ID number (ID
No.) and sector number (Sector No.) are recorded in the ID part (ID ₁ ), and the data written in the ID part differs depending on the position of the track. The other portions have substantially the same pattern between tracks (adjacent portions).

In a general sector format, a sector has a header portion (Header) and a data recording portion (Recording F).
ield). The header part is SM, VFO ₁ , AM, I
D ₁ , VFO ₂ , AM, ID ₂ , VFO ₂ , AM, ID ₃ ,
It consists of PA, and the data recording part is ODF, GAP, VFO
₃ , consists of SYN, Data Field, PA and BUF.

SM is a sector mark for detecting the beginning of a sector, and is written in a pattern different from that of data. VFO (VFO _{1 to} VFO ₃ ) is a mark for bit synchronization, and AM is a mark for byte synchronization. VFO ₁ , VFO ₂ , and AM are IDs (ID _{1 to} ID ₃ )
Is a mark for synchronizing in order to read, and VFO ₃ is a mark for synchronizing in order to read data.

The ID consists of a track number, an ID number, a sector number and an error detection code CRC.
The number and sector number are recorded as data. PA
Is a data demodulation mark, and ODF and GAP have no mark recorded. SYN is a byte synchronization mark for reading data and has the same function as AM. BU
F is a margin part at the time of rotation fluctuation, and Data Field is data read / written arbitrarily.

In recent years, the capacity of optical discs has been increased, and as one method therefor, as shown in FIG. 12, recording / reproducing of data composed of marks 33 and 34 on both the groove portion 31 and the land portion 32 of the optical disc. A land / groove recording method has been proposed. Here, in the optical disc, a groove portion 31 and a land portion 32 are formed on a substrate 35, a protective film 36 is provided thereon, and a laser beam 37 is irradiated to record, reproduce, and erase data. If the land / groove recording method is realized without changing the track pitch, the number of recordable tracks on the optical disk apparently doubles and the capacity doubles.

Hitachi general commentary VOL65, NO.10 (1983-10) "Large-capacity optical disk file" describes the current general optical disk, and Optical Data Stratege '90 "High Track".
Density Magnet-Optical Recording Using a C
In "rosstalk Canceller", a land-groove recording type crosstalk removing method is described. An optical disc is produced by digging a groove on a master and transferring it, but the premark of the groove becomes a premark (preformatted mark) where the groove cannot be formed by intermittently making a groove on the master. The premark of the land portion is formed by forming a groove on the master and then irradiating the land portion with laser light to form a hole.

[0011]

In the land / groove recording method, the method of forming preformatted marks differs between the land portion and the groove portion. 13 and 14
Shows the state of premarks in the land portion and groove portion of the optical disc. Pre-mark 3 of groove section 31 of optical disc
8 is formed in a discontinuous shape, and has the same height as the land 32 where the premark 39 is not present.

FIG. 15 shows the groove portion 31 and the land portion 3.
2 shows reproduced signals of the premarks 38 and 39 on the upper part 2. The reproduction signal of the land portion 32 is the level when there is no premark 39.
The level when the premark 39 is present with respect to (land level) is lowered. The reproduction signal of the groove portion 31 has an increased level when the premark 38 is present as compared with a level (groove level) when the premark 38 is not present.

The track pitch is about 1.6 μm, and the width of the land portion 32 and the width of the groove portion 31 are both about 0.8 μm. The diameter of the reproducing light spot on the optical disk is 1 / e ² and is about 1.3 μm, and even if a signal is reproduced from the groove portion 31, the peripheral portion of the light spot is applied to the land portion 32 adjacent to the groove portion 31. , Signals on the land portion 32 mix and crosstalk occurs.

During reproduction of the premark, as shown in FIG. 15, one of the reproduction signal of the groove portion 31 and the reproduction signal of the land portion 32 is increased by the premarks 38 and 39 and the other is decreased. When crosstalk occurs, the amplitude of the reproduced signal will decrease regardless of which of the groove portion 31 and the land portion 32 is reproducing the signal. Furthermore, since the premarks 38 and 39 have substantially the same pattern between adjacent tracks except for the ID portion, most of the reproduced signals of the premark are reduced due to crosstalk.
The S / N ratio of the pre-mark reproduction signal decreases, and reliable data recording, reproduction and erasing cannot be performed.

Further, the optical disc requires premarks 38 and 39 in both the groove portion 31 and the land portion 32.
It takes time to manufacture the premarks 38 and 39. In particular, the pre-mark 39 of the land portion 32 requires that a mark (hole) be accurately formed in the center of the land portion 32, which requires high-precision control of the light spot, making it difficult to manufacture the master. The present invention is an information recording medium and information recording capable of improving the above-mentioned drawbacks, reducing the number of premarks that are time-consuming to manufacture, and reducing crosstalk of premarks, and realizing a new application of the land / groove recording method. The purpose is to provide a device.

[0016]

In order to achieve the above object, the invention according to claim 1 is an information recording medium for recording and / or reproducing information in both a land portion and a groove portion formed by tracks. The pre-formatted portion is formed on only one of the land portion and the groove portion.

According to a second aspect of the present invention, there is provided an information recording apparatus for recording and / or reproducing information on both a land portion and a groove portion formed by tracks of the information recording medium according to the first aspect. The land portion and the groove portion are distinguished by detecting the sector mark from the recording medium.

According to a third aspect of the present invention, in an information recording medium for recording and / or reproducing information on both a land portion and a groove portion formed by tracks, a preformatted portion is formed every two tracks. Is.

According to a fourth aspect of the present invention, there is provided an information recording apparatus for recording and / or reproducing information on both the land portion and the groove portion formed by the tracks of the information recording medium according to the first aspect. The reflected light from the recording medium is detected by a photodetector divided into two in the track direction, and the track position is detected by the preformatted part reproduction signal level from each element of the photodetector.

According to a fifth aspect of the present invention, in an information recording medium in which information is recorded / reproduced on / from both a land portion and a groove portion formed by tracks, only one complete pre-recording is performed on each track of the land portion and the groove portion. The format is recorded, and only the sector mark is formatted in each sector.

According to a sixth aspect of the invention, in the information recording medium according to the fifth aspect, the positions of the complete preformatted portions of the land portion and the groove portion are not adjacent to each other.

The invention according to claim 7 is the invention according to claim 5 or 6.
In the described information recording medium, sector marks indicating the beginning of a sector are formed every other track.

According to an eighth aspect of the present invention, in an information recording medium for recording and / or reproducing information on both a land portion and a groove portion formed by tracks, one of the land portion and the groove portion is a ROM. It was done.

The invention according to claim 9 is an information recording apparatus for recording and / or reproducing information in both a land portion and a groove portion formed by tracks of the information recording medium according to claim 8. The ROM of the recording medium and the data recording section are different in at least the number of revolutions of the information recording medium at the time of reproduction.

According to a tenth aspect of the present invention, there is provided an information recording apparatus for recording and / or reproducing information on both the land portion and the groove portion formed by the tracks of the information recording medium according to the eighth aspect. In the described information recording apparatus, ROM data is recorded and / or reproduced by a mark edge method, and recorded data is recorded and / or reproduced by a mark position method.

According to an eleventh aspect of the present invention, in the information recording medium according to the eighth aspect and the information recording medium used in the information recording apparatus according to the ninth or tenth aspect, the linear velocity is constant during reproduction of ROM data, The data recording unit is configured so that the angular velocity is constant during recording and / or reproduction of data.

According to a twelfth aspect of the invention, in an information recording medium in which information is recorded and / or reproduced in both a land portion and a groove portion formed by a track, 0 addresses of the land portion and the groove portion are respectively formed on the inner circumference. And the outer circumference, and the rotation directions of the land portion and the groove portion during recording and / or reproduction are opposite to each other.

[0028]

According to the first aspect of the present invention, one of the land portion and the groove portion, on which the preformatted portion is formed, has information recorded and / or reproduced by a normal operation, and the preformatted portion is formed. If there is no preformatted part, information is recorded and / or reproduced using the preformatted part having the preformatted part. In the invention described in claim 2, information is recorded and / or reproduced on both the land portion and the groove portion formed by the tracks of the information recording medium according to claim 1, and the sector mark is detected from the information recording medium. The land portion and the groove portion are identified by.

According to the third aspect of the invention, information is recorded and / or reproduced on both the land portion and the groove portion by utilizing the preformatted portion formed every two tracks. According to a fourth aspect of the invention, information is recorded and / or reproduced on both the land portion and the groove portion formed by the tracks of the information recording medium according to the first aspect.
The reflected light from the information recording medium is detected by a photodetector divided into two in the track direction, and the track position is detected by the preformatted part reproduction signal level from each element of the photodetector.

According to a fifth aspect of the present invention, a complete pre-format is recorded in only one place in each track of the land portion and the groove portion, and only the sector mark is formatted in each sector. Information is recorded / reproduced on both sides. According to a sixth aspect of the invention, in the information recording medium of the fifth aspect, the positions of the complete preformatted portions of the land portion and the groove portion are not adjacent to each other.

According to a seventh aspect of the invention, in the information recording medium according to the fifth or sixth aspect, sector marks indicating the heads of the sectors are formed every other track. In the invention described in claim 8, either one of the land portion and the groove portion is a ROM, and information is recorded and / or reproduced in both the land portion and the groove portion.

According to a ninth aspect of the invention, information is recorded and / or reproduced on both the land portion and the groove portion formed by the tracks of the information recording medium according to the eighth aspect, and the information recording medium ROM and the ROM are used. The number of revolutions of the information recording medium at least during reproduction differs from that of the data recording unit. According to a tenth aspect of the invention, information is recorded and / or reproduced on both the land portion and the groove portion formed by the tracks of the information recording medium according to the eighth aspect, and the ROM data is recorded by the mark edge method. Recording data is recorded and / or reproduced by the mark position method.

According to an eleventh aspect of the present invention, in the information recording medium according to the eighth aspect and the information recording medium used in the information recording apparatus according to the ninth or tenth aspect, the linear velocity is constant during reproduction of ROM data. The angular velocity is constant during data recording and / or reproduction. Claim 12
In the described invention, in an information recording medium for recording and / or reproducing information in both the land portion and the groove portion,
The 0 addresses of the land portion and the groove portion are set to the inner circumference and the outer circumference, respectively, and the rotation directions of the land portion and the groove portion at the time of recording and / or reproducing are opposite to each other.

[0034]

FIG. 1 shows a first embodiment of the present invention. This first
The embodiment is an embodiment of the invention described in claims 1 and 2. First
In the embodiment, the track is formed in a spiral shape or a concentric shape, and the track for one round is divided into a plurality of sectors.
Land portions L1, L2, L3 formed by tracks ...
.. and the groove portions G1, G2, G3 ... In the land / groove recording type optical disc in which information is recorded, reproduced and erased, the groove portions G1, G2, G3 ...
・ The same pre-mark as before is formed on the
No premark is formed on 1, L2, L3, ....

The optical disc of the first embodiment has the groove portions G1 and G formed by an information recording device including an optical disc device.
When recording, reproducing, and erasing data in 2, G3, ..., Recording, reproducing, and erasing data in the groove portions G1, G2, G3, ... To do. In addition, by the information recording device, the land portions L1, L
When recording, reproducing and erasing data on 2, L3, ... For example, when recording, reproducing and erasing data on the land portion L1, the information recording device performs from the detection of the sector to the reading of the data of the ID portion. Go to the groove part G1 to find the track number and sector number of the groove part G1, and make a track jump before VFO ₃ to enter the land part L1.
(Because there is no data in VFO and GAP, you can do a track jump in front of VFO ₃ ), V
Data is recorded, reproduced, and erased after self-recording of FO ₃ and SYN.

The track numbers and sector numbers of the land portions L1, L2, L3 ... Are land portions L1, L2, L3.
Adjacent to (inner or outer) groove portions G1, G2, G3
The same track number and sector number may be used for all lands by only identifying the land portions L1, L2, L3 ... And the groove portions G1, G2, G3. The parts L1, L2, L3 ... Are identified. Land portions L1, L2, L3 ... And groove portions G1,
.. are identified by detecting the sector mark SM by an information recording device, and all the land portions L1, L2, L3 ... Are identified based on the result. S
Since M is a long mark, its reproduction signal level is large and detection is easy.

In the first embodiment, in the land / groove recording type optical disc, the pre-mark is set to the land portion L.
1, L2, L3 ... and groove portions G1, G2, G3 ...
The master is easily manufactured, and the yield is improved. Also,
Since the premarks are only on one of the land portions L1, L2, L3 ... And the groove portions G1, G2, G3 ..., The premarks are the land portions L1, L2, L3 ... And the groove portions G1, G2. , G3 ..., the interference of both premarks is eliminated. Further, since the long mark SM is provided only on one of the land portions L1, L2, L3 ... And the groove portions G1, G2, G3 ..., the land portions L1, L2 can be detected only by detecting the SM. , L3 ...
. And the groove portions G1, G2, G3, ... Can be identified.

FIG. 2 shows a second embodiment of the present invention. The second embodiment is an embodiment of the invention described in claim 3. In the second embodiment, tracks are formed in a spiral shape or a concentric shape, and a track for one round is divided into a plurality of sectors, and land portions L1, L2, L3 ...
And land portions G1, G2, G3 ... In a land / groove recording type optical disc in which information is recorded / reproduced / erased.
.. and the groove portions G1, G2, G3, ... Form the same premarks as the conventional one every two tracks, and the premarks are not formed on the other tracks. That is,
Land portions L1, L2, L3 ... and groove portions G1, G
For 2, G3, ..., Premarks are formed on one of the three tracks (three turns).

Sync signal for track without premark, I
The detection of the D signal by the information recording device is performed as follows.
The width of the land portions L1, L2, L3 ... And the groove portion G1,
The width of G2, G3, ... Is about 0.8 μm, and the diameter of the reading light spot 41 by the information recording device is 1 / e ²
Is about 1.3 μm. Therefore, for example, the light spot 41
Even when is following the groove portion G2, the light spot 41 is applied to the land portion L2, and the signal of the land portion L2 can be detected by the information recording device.

Therefore, the information recording apparatus uses the light spot 41.
The groove portion G2, the land portion L3, and the like having the premark on the right side with respect to the traveling direction of the
2 is detected to detect the land portion L3 from the signal of the groove portion G4. In addition, the information recording apparatus has a groove portion G having a premark on the left side with respect to the traveling direction of the light spot 41.
3, the land portion L4 and the like are detected from the signal of the premark on the left side of the land portion L4, and, for example, the groove portion G3
Is detected to detect the land portion L4 from the signal of the groove portion G4.

In the second embodiment, the track number having a preformat in the groove portion is 1 + 3n (n = 0,
The number of the track which is the 1st, 2nd, 3rd ...) th track and has a pre-format in the land portion is 2 + 3n (n =
It is the 0th, 1st, 2nd, 3rd ...) th track. When accessing an arbitrary track, for example, when accessing the k-th (k = 1 + 3n + 1) track where there is no premark in the groove portion, the information recording apparatus once accesses the 1 + 3n-th groove portion and jumps to the track to perform 1 + 3n +.
Entering the first groove portion, the ID signal and the synchronizing signal are detected from the premark of the 2 + 3nth land portion to record, reproduce, and erase information.

In this second embodiment, the land portions L1 and L
.. and groove portions G1, G2, G3, ..., Premarks are formed every two tracks, which facilitates production and improves yield. Further, since the premark does not exist on both adjacent tracks, there is no signal interference as in the case where the premark exists on both adjacent tracks.

In the optical disc of the second embodiment, when accessing an arbitrary track, the track having the premark must be accessed without fail, but the magnetic recording apparatus of the third embodiment of the present invention provides faster access. It will be possible. The third embodiment is an embodiment of the invention described in claim 4. FIG. 3 shows the outline of the third embodiment. Semiconductor laser 42
The light emitted from the laser beam is collimated by the collimator lens 43, reflected by the beam splitter 44 and incident on the objective lens 45 to form a minute light spot on the recording surface of the optical disc 46 of the second embodiment. Data is reproduced, recorded, or erased. The light reflected by the optical disk 46 passes through the objective lens 45 and the beam splitter 44, is converted into condensed light by the condenser lens 47, and is partially reflected by the beam splitter 48.

The reflected light from the beam splitter 48 is given astigmatism by the cylindrical lens 49 and enters the photodetector 50. The focus error signal and the track error signal for controlling the objective lens 45 in the focusing direction and the tracking direction are detected from the output signal of the photodetector 50 by a circuit not shown by the well-known astigmatism method and push-pull method, and the focus actuator. ,
The tracking actuator moves the objective lens 45 in the focusing direction and the tracking direction according to the focus error signal and the track error signal, thereby focusing and tracking the light spot on the recording surface of the optical disc 46. If the optical disc 46 is a phase change medium, the information signal is detected from the sum signal of the photodetector 50 by a circuit (not shown). Also,
The transmitted light from the beam splitter 48 is incident on a photodetector 51 which is divided into two parallel to the direction of the track on the optical disc 46.

Now, it is assumed that the light spot 41 follows the groove portion G2 as shown in FIG. At this time, the output signals of the elements A and B divided into two in the track direction of the photodetector 51 are as shown in FIGS. Figure 4 (a)
As is clear from (b), when the light spot 41 follows a track without a premark, if there is a premark on the right side with respect to the traveling direction of the light spot 41, the signal of the premark is output by the element A of the photodetector 51. To be detected.
At this time, the element B of the photodetector 51 also detects the signal of the premark on the left side by two tracks with respect to the traveling direction of the light spot 41, but the level thereof is very small.

When the light spot 41 follows a track without a premark and has a premark on the left side in the traveling direction of the light spot 41, for example, when the light spot 41 follows the groove portion G3, the land portion L2 The signal of the pre-mark is detected by the element B of the photodetector 51. When the light spot 41 is following the land portion L2, the output signals of the elements A and B of the photodetector 51 are substantially equal to each other. The output levels of the premark signals from the elements A and B divided into two in the track direction of the photodetector 51 are compared by a circuit (not shown), and the light spot 41
It is detected whether the track followed by is a track adjacent to the left side or a track adjacent to the right side of the track in which the premark signal is written. In this case, whether the track followed by the light spot 41 is the track adjacent to the groove part or the track adjacent to the land part depends on whether the premark signal is the elements A and B of the photodetector 51 as described in FIG. The output signal of is increased or decreased with respect to the level without a mark (land level or groove level).

In the third embodiment, only by detecting the level of the premark reproduction signal from the elements A and B of the photodetector 51 having the dividing line in the direction parallel to the track, the light spot of the track having the premark is detected. The positions of existing tracks can be easily detected, and the positions of all tracks and the positions of sectors can be immediately determined.

FIG. 5 shows a track error signal when the light spot 41 crosses a track in the third embodiment. When the light spot 41 is located at the center of the land portion and the center of the groove portion, the track error signal becomes zero. When the light spot is shifted to the right from the center of the land, the track error signal becomes-(negative). Further, when the light spot is shifted to the right from the center of the groove portion, the track error signal becomes + (positive). Therefore, in the fourth embodiment of the present invention, means for moving the light spot 41 in the same direction on the track by a minute amount in the third embodiment is provided, and the polarity of the track error signal at the time of the movement is provided by a circuit not shown. By detecting, it is detected whether the light spot 41 is on the land portion or the groove portion.

FIG. 6 shows a fifth embodiment of the present invention. The fifth embodiment is an embodiment of the invention described in claim 5. In the optical disc 52 of the fifth embodiment, tracks are formed in a spiral shape or a concentric shape, and a track for one round is divided into a plurality of sectors, and a land portion L formed by the tracks is formed.
1, L2, L3 ... and groove portions G1, G2, G3.
..Land where information is recorded, reproduced, and erased on both
In the groove recording type optical disc, the land portion L
1, L2, L3 ... and groove portions G1, G2, G3.
.. Only one place has one premark 53 similar to the conventional one
S is formed for each sector 54 to indicate the start of the sector.
Only M55 is formed.

The synchronizing signal, the ID signal, etc. of each sector are recorded together with the data at the time of recording by the information recording device (or recorded at the time of initial formatting), and the reference track number and ID number are premarked by the information recording device.
Is obtained from the reproduction signal of. In this fifth embodiment, the land portions L1, L2, L3 ... And the groove portions G1, G
.., one complete pre-mark 53 is formed in only one place, and only the SM 55 is formed in each sector 54, so that the master disc and the optical disc can be easily manufactured. Also, since there are few premarks, signal interference between premarks is reduced.

FIG. 7 shows a sixth embodiment of the present invention. The sixth embodiment is an embodiment of the invention described in claim 6. The optical disk of the sixth embodiment is similar to the optical disk of the fifth embodiment in that the land portion L
1, L2, L3 ... and groove portions G1, G2, G3.
.. The position of one complete premark 53 that has been preformatted in only one position in the land portions L1, L2, L3 ... Premark 53L and groove portions G1, G2, G3. It is the one that has been shifted.

In the sixth embodiment, one complete premark 53 is formed by the premark 53L of the land portions L1, L2, L3 ... And the premark 53G of the groove portions G1, G2, G3. Since it was shifted, the land part L1,
It is possible to reduce the crosstalk of the pre-mark reproduction signal between L2, L3 ... And the groove portions G1, G2, G3.
Premark signals with good N can be detected.

In the seventh embodiment of the present invention, the SM indicating the start position of the sector in the fifth or sixth embodiment
Is pre-formatted at least every other track. Since the SM is a long mark, it can be detected on a track adjacent to the track followed by the light spot, and is detected by the same information recording device as in the third embodiment. That is, 2 in the track direction of the photodetector 51.
The output levels of the premark signals from the divided elements A and B are compared by a circuit (not shown), and the SM of the track adjacent to the track followed by the light spot 41 is detected. In the seventh embodiment, since the SM is pre-formatted at least every other track, the master disc and the optical disc can be easily manufactured, and the yield is improved.

FIG. 8 shows an eighth embodiment of the present invention. In the eighth embodiment, tracks are formed in a spiral shape or a concentric shape, and a track for one round is divided into a plurality of sectors, and land portions L1, L2, L formed by the tracks are formed.
3 ... and groove portions G1, G2, G3 ... In the land / groove recording type optical disc in which information is recorded, reproduced and erased, only one place per track is the same as the conventional one. A perfect premark is formed,
The premark 53L of the land portions L1, L2, L3 ... And the premark 53G of the groove portions G1, G2, G3. The start of the sector, the track number, and the basic sync signal are detected by the information recording device from the reproduction signals of the premarks 53L and 53G, and the signals related to other sectors are after-formatted by the information recording device with reference to the premarks 53L and 53G during data recording. To do.

In the ninth embodiment of the present invention, tracks are formed in a spiral shape or a concentric shape, and a track for one round is divided into a plurality of sectors, and land portions L1, L2, L3. ..And groove portions G1, G
In the land / groove recording type optical disc in which information is recorded, reproduced, and erased on both G2, G3, ..., Land portions L1, L2, L3 ,.
One of the two, G3, ... Is a ROM. In this way, a single optical disc has a large R capacity.
It becomes possible to provide the OM and the data recording medium.

The tenth embodiment of the present invention is a land portion L1 formed by tracks on the optical disk of the ninth embodiment.
An information recording device including an optical disk device of a land / groove recording system that records, reproduces, and erases information on both L2, L3, ... And groove portions G1, G2, G3. At the time of reproduction and land portions other than ROM, such as L1, L2, L3 ... Or groove portions G1, G
The number of revolutions of the optical disk is changed when recording, reproducing and erasing data of 2, G3 ...

For example, when reproducing data from the ROM, the number of revolutions of the optical disk is set to 600 rpm, and the land portions L1, L2, L3 ... Or the groove portion G other than the ROM are set.
When recording, reproducing and erasing data of 1, G2, G3 ..., The rotation speed of the optical disk is set to 6000 rpm. Here, the reproduction signal has different frequencies when the rotation speed of the optical disk is 600 rpm and when it is 6000 rpm, so that the ROM data and other data are separated by passing through a frequency separation filter to reduce crosstalk. .

The eleventh embodiment of the present invention is a land portion L1 formed by tracks on the optical disk of the ninth embodiment.
An information recording apparatus comprising a land / groove recording type optical disk apparatus for recording, reproducing and erasing information on both L2, L3 ... And groove sections G1, G2, G3. In addition to recording by the mark edge method, data recording by the user is performed by the mark position method by a recording circuit (not shown). In the eleventh embodiment, the ROM data is recorded by the mark edge method and the data is recorded by the user by the mark position method.
Parts such as demodulation ICs for data and data can be shared,
An optical disc device for ROM and data recording can be realized at low cost.

The optical disc of the twelfth embodiment of the present invention is the optical disc of the ninth embodiment, or the optical discs used in the tenth and eleventh embodiments.
The eleventh embodiment is configured so that the linear velocity of the optical disk is constant when the ROM data is reproduced, and the angular velocity of the optical disk is constant when the data is recorded, reproduced or erased. The method of making the linear velocity of the optical disk constant and the method of making the angular velocity of the optical disk constant are common, and the assets of the existing optical disk device can be used as they are.

The optical disk of the thirteenth embodiment of the present invention is an information recording medium composed of an optical disk of a land / groove recording system in which information is recorded, reproduced and erased on both a land portion and a groove portion formed by tracks. The 0 addresses of the land portion and the groove portion are set to the inner circumference and the outer circumference, respectively, and the information recording device is configured so that the rotation directions of the land portion and the groove portion at the time of recording, reproducing and erasing are opposite to each other. .

For example, in the optical disc of the thirteenth embodiment, recording / reproducing of the land portion when viewed from the objective lens of the information recording apparatus,
It is configured so that it is clockwise when erasing and counterclockwise when recording, reproducing and erasing the groove portion. When the information recording apparatus accesses the land portion of the optical disc and rotates the optical disc clockwise, the track that can demodulate the data of the ID part is the track of the land part, and the track that cannot demodulate the data of the ID part is the groove part. Since it is a track, the land portion and the groove portion can be easily distinguished from each other.

[0062]

As described above, according to the first aspect of the invention, in the information recording medium for recording and / or reproducing the information on both the land portion and the groove portion formed by the track, the land portion and the groove are formed. Since the pre-formatted portion is formed on only one of the portions, the number of pre-marks that are time-consuming to manufacture can be reduced, the manufacturing becomes easy, and the yield improves. Further, since the premark exists only in one of the land portion and the groove portion, there is no interference between the premarks as in the case where the premark exists in both the land portion and the groove portion.

According to a second aspect of the invention, there is provided an information recording apparatus for recording and / or reproducing information on both the land portion and the groove portion formed by the tracks of the information recording medium according to the first aspect. Since the land portion and the groove portion are identified by detecting the sector mark from the information recording medium, the land portion and the groove portion can be identified only by detecting the sector mark of the long mark.

According to the third aspect of the invention, in the information recording medium for recording and / or reproducing the information on both the land portion and the groove portion formed by the tracks, the preformatted portion is formed every two tracks. Because I did
Manufacturing is facilitated and yield is improved. Further, since the premark does not exist on both adjacent tracks, there is no signal interference as in the case where the premark exists on both adjacent tracks.

According to a fourth aspect of the invention, there is provided an information recording apparatus for recording and / or reproducing information on both the land portion and the groove portion formed by the tracks of the information recording medium according to the first aspect. Since the reflected light from the information recording medium is detected by the photodetector divided into two in the track direction and the track position is detected by the preformatted part reproduction signal level from each element of this photodetector,
The position of the track having the light spot with respect to the track having the premark can be easily detected only by detecting the level of the premark reproduction signal from the photodetector.

According to the fifth aspect of the invention, in an information recording medium in which information is recorded / reproduced in both the land portion and the groove portion formed by the tracks, only one place in each track of the land portion and the groove portion is perfect. Since the pre-format is recorded and only the sector mark is formatted in each sector, the production is facilitated, the pre-mark is reduced, and the signal interference between the pre-marks is reduced.

According to the sixth aspect of the present invention, in the information recording medium according to the fifth aspect, the positions of the complete preformatted portions of the land portion and the groove portion are not adjacent to each other. It is possible to reduce the crosstalk of the premark reproduction signal between and, and it is possible to detect the premark signal with a good S / N.

According to the seventh aspect of the invention, in the information recording medium according to the fifth or sixth aspect, since the sector mark indicating the beginning of the sector is formed on every other track, the production is facilitated and the yield is improved. .

According to the eighth aspect of the invention, in the information recording medium for recording and / or reproducing the information on both the land portion and the groove portion formed by the track, either one of the land portion and the groove portion is formed. Since the ROM is used, it is possible to provide a large-capacity ROM and a data recording medium with one sheet.

According to a ninth aspect of the present invention, there is provided an information recording apparatus for recording and / or reproducing information on both the land portion and the groove portion formed by the tracks of the information recording medium according to the eighth aspect. Since the ROM of the information recording medium and the data recording portion differ in at least the number of revolutions of the information recording medium at the time of reproduction, it is possible to reduce the crosstalk by separating the ROM data from other data.

According to the invention of claim 10, claim 8 is provided.
An information recording apparatus for recording and / or reproducing information on both a land portion and a groove portion formed by tracks of the information recording medium described in the above, or the information recording apparatus according to claim 9, wherein the ROM data is a mark edge system. Since recording and / or reproduction is performed and recorded data is recorded and / or reproduced by the mark position method, parts such as ROM and data demodulation ICs currently on the market can be shared, and the cost can be reduced. An information recording device for ROM and data recording can be realized.

According to the invention of claim 11, claim 8 is provided.
In the information recording medium described in the above, or in the information recording medium used in the information recording device according to claim 9 or 10, the linear velocity is made constant during reproduction of ROM data, and the angular velocity during recording and / or reproduction of data in the data recording portion. Since it is configured to be constant, the assets of the existing information recording device can be used as they are.

According to the twelfth aspect of the invention, in an information recording medium for recording and / or reproducing information on both the land portion and the groove portion formed by tracks,
Since the 0 addresses of the land portion and the groove portion are respectively set to the inner circumference and the outer circumference, and the rotation directions of the land portion and the groove portion at the time of recording and / or reproducing are opposite to each other, the land portion and the groove portion are It is easy to identify.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of a first embodiment of the present invention.

FIG. 2 is a plan view showing a part of a second embodiment of the present invention and a photodetector.

FIG. 3 is a schematic view showing a third embodiment of the present invention.

FIG. 4 is a waveform diagram showing an output signal waveform of the photodetector in the third embodiment.

FIG. 5 is a diagram showing a track error signal when a light spot crosses a track in the third embodiment.

FIG. 6 is a plan view showing a fifth embodiment of the present invention.

FIG. 7 is a plan view showing a sixth embodiment of the present invention.

FIG. 8 is a plan view showing an eighth embodiment of the present invention.

FIG. 9 is a perspective view showing an outline of a conventional optical disc device.

FIG. 10 is a plan view showing a general optical disc.

FIG. 11 is a diagram showing a preformat section of a general optical disc.

FIG. 12 is a diagram for explaining a land / groove recording method.

FIG. 13 is a perspective view showing a part of an optical disc of the land / groove recording system.

14 is a cross-sectional view taken along line X-X ′ of FIG.

FIG. 15 is a waveform diagram showing a premark reproduction signal of the land / groove recording system.

[Explanation of symbols]

 G1, G2, G3 Groove part L1, L2 Land part

Claims (12)

[Claims] 1. An information recording medium for recording and / or reproducing information on both a land portion and a groove portion formed by tracks, wherein a pre-format portion is formed on only one of the land portion and the groove portion. An information recording medium characterized by: 2. An information recording device for recording and / or reproducing information on both a land portion and a groove portion formed by tracks of the information recording medium according to claim 1, wherein sector marks are formed from the information recording medium. An information recording device characterized by identifying a land portion and a groove portion by detecting. 3. An information recording medium for recording and / or reproducing information on both a land portion and a groove portion formed by tracks, characterized in that a preformatted portion is formed every two tracks. Medium. 4. An information recording device for recording and / or reproducing information on both of a land portion and a groove portion formed by tracks of the information recording medium according to claim 1, wherein reflected light from the information recording medium is used. Is detected by a photodetector divided into two in the track direction, and the track position is detected by the level of the reproduction signal of the preformat section from each element of the photodetector. 5. An information recording medium in which information is recorded and reproduced on both a land portion and a groove portion formed by tracks, and a complete preformatted portion is recorded only at one location on each track of the land portion and the groove portion, An information recording medium characterized in that only sector marks are formatted in each sector. 6. The information recording medium according to claim 5, wherein the positions of the complete preformatted portions of the land portion and the groove portion are not adjacent to each other. 7. The information recording medium according to claim 5, wherein sector marks indicating the beginning of a sector are formed on every other track. 8. An information recording medium for recording and / or reproducing information on both a land portion and a groove portion formed by a track, wherein one of the land portion and the groove portion is a ROM. Information recording medium. 9. An information recording device for recording and / or reproducing information on both a land portion and a groove portion formed by tracks of the information recording medium according to claim 8, wherein the ROM and the data of the information recording medium are included. An information recording device, wherein the number of revolutions of the information recording medium at least during reproduction is different from that of the recording unit. 10. An information recording apparatus for recording and / or reproducing information on both a land portion and a groove portion formed by tracks of the information recording medium according to claim 8, or an information recording apparatus according to claim 9. An information recording apparatus characterized in that ROM data is recorded and / or reproduced by a mark edge method, and recorded data is recorded and / or reproduced by a mark position method. 11. The information recording medium according to claim 8,
Alternatively, in the information recording medium used in the information recording apparatus according to 10, the linear velocity is constant during reproduction of ROM data,
Data recording section An information recording medium characterized in that the angular velocity is constant during recording and / or reproduction of data. 12. In an information recording medium for recording and / or reproducing information on both a land portion and a groove portion formed by tracks, 0 of the land portion and the groove portion is recorded.
An information recording medium, characterized in that the addresses are respectively set to the inner circumference and the outer circumference, and the rotation directions of the land portion and the groove portion during recording and / or reproduction are opposite to each other.