JPH0757269A - Method and device for recording data of optical recording medium and device for reproducing data of optical recording medium - Google Patents

Abstract

PURPOSE:To record it with recording density different from each other by respectively recording the logical operation data of first and second recording modes on inner and outer peripheies of a track and the track having l/n pitch of a reproducing light beam spot with forward and inversed pit lines. CONSTITUTION:By a system controller 35, prescribed logical operation is performed with a logical operation circuit 32 in a first or a second recording mode, and the data are outputted, and a reproducing beam spot(BS) of a laser light source 12 is formed. In the first recording mode, the positive/negative logical data are recorded on the inner/outer peripheries on the basis of a track center scanned by the BS as a reference, by intensity modulating a light beam with an AOM 13A as the pit line/ inverse pit line. Further, in the second recording mode, the recording data and the input data of former consecutive n-1 pieces of tracks are operated by the circuit 32, and are made the next data. The data are recorded on the track with the pitch of 1/n of the BS by minute deflecting the light beam with an AOD 13B. Thus, the data with recording density different from each other are recorded without changing an optical system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data recording on an optical recording medium such as an optical disk, a magneto-optical disk, an information card, etc., in which recording data is expressed by recording a recording data on a track on a recording surface with a pit train consisting of pits and a mirror surface. The present invention relates to a method, a data recording device for an optical recording medium, and a data recording device for an optical recording medium.

[0002]

2. Description of the Related Art A recording format of an optical recording medium, for example, an optical recording medium (hereinafter referred to as an optical disk) which is rotationally driven by a CAV (constant angular velocity) method, for example, a recording format of a data part, is as shown in FIG. Track center T
Pits P having a pit width d of 0.5 μm and a pit length per clock of 0.86 μm are formed on the c at a track pitch Tp of 1.6 μm in the radial direction of the optical disc and the pits P are formed. Are formed in a format in which the positions in the track direction are aligned. The portion without the pit P is a mirror surface.

These dimensions are based on manufacturing restrictions and the diameter of the beam spot BS on the recording surface of the optical disk irradiated with the laser beam emitted from the reproducing laser light source.

In order to increase the recording density of an optical disc,
It is possible to reduce the track pitch Tp, the pit length, and the size of the beam spot BS.

For example, in a magneto-optical disk, there is a restriction that pits recorded based on access unit data and pits of other access units are independent, and all data of access units must be rewritten. ,
The pit length is shortened substantially by so-called overwriting, in which the spot scanning speed is slowed down while maintaining the spot size of the laser beam, and the pit to be formed next overlaps a part of the pit formed previously. To increase the recording density. That is, a magneto-optical disc having a higher recording density in the track direction and a higher recording density than a so-called compact disc, which is a read-only optical disc having the same diameter, has been realized.

In order to reproduce the data recorded on the optical disk having the above-mentioned recording format, the optical disk is rotated by, for example, the CAV method and the track center T
By irradiating the laser beam for reproduction onto c, the beam spot BS of the laser beam relatively scans the recording surface of the optical disc, and the reflected light of the laser beam by the recording surface is received by the light receiving element, A detection signal having a signal level corresponding to the amount of reflected light is obtained from the light receiving element. Then, the signal detected by the light receiving element is demodulated by a signal processing circuit to reproduce data from the detected signal.

That is, since the reflected light which is reflected by the mirror surface and is incident on the light receiving element is the light which is almost totally reflected by the mirror surface, the amount of the reflected light is large and a detection signal having a high signal level is received from the light receiving element. Will be output. On the other hand, the amount of light reflected by the pits is smaller than the amount of light reflected by the mirror surface, so that the detection signal with a low signal level is output from the light receiving element.

Then, in the signal processing circuit in the subsequent stage, first, the detection signal output from the light receiving element to the series is sampled at a predetermined clock timing, and the pulse amplitude has a value corresponding to the signal level. It is converted into binarized data, and the binarized data is subjected to a decoding process corresponding to the encoding process (parity addition and interleaving process) performed for error correction, and the reproduced data is taken out.

In this case, since the data corresponding to the pit P is logically "1" and the data corresponding to the mirror surface is logically "0", for example, "1" or "0" continues for a long time. In the case of such data, the deviation of the DC balance becomes large, that is, the DSV (Digital Sum Value) value is biased toward the (-) side or the (+) side, which causes an unstable state of the servo control system. Occurs.

Further, this data recording has a problem that the data length is substantially increased, which is disadvantageous in increasing the density of recorded data.

On the other hand, as another recording method, the data is recorded by logically setting the boundary between the pit and the mirror surface to "1" and logically setting the pit portion and the mirror surface portion other than the boundary to "0". There is. The same applies to reproduction. In this case, unlike the above method, there is no need to increase the data length, which is advantageous in increasing the recording data density.

Therefore, conventionally, in recording (forming) the pits P on the optical disk, EFM (Eight to Fourtee) is used.
n Modulation) system is adopted, and 8-bit data is converted into 14-bit data for pit recording. Therefore, in reproduction, in the signal processing circuit,
In addition to the error correction decoding process, the EFM process decoding is performed to retrieve the reproduction data.

[0013]

By the way, in order to increase the recording density in the radial direction of such an optical disc, the track pitch is narrowed, the pit length is shortened, and the crosstalk caused by the pits on the adjacent tracks is prevented. It is conceivable to reduce the spot size of the laser beam so as not to occur.

However, if the track pitch is narrowed without changing the spot size of the laser beam, the laser beam is also applied to the pits of the adjacent tracks to cause crosstalk, and the S / N (Signal to Noise ratio) is lowered. However, in the worst case, there is a possibility that the data cannot be reproduced. Further, since the spot size of the laser beam is proportional to the wavelength of the laser beam and inversely proportional to the numerical aperture (NA: Numerical Aperture) of the objective lens,
In order to reduce the spot size of the laser beam in order to eliminate the crosstalk, there is a problem in that a laser light source with a short wavelength is developed and an expensive and large lens is required to increase the NA.

Further, in the above EFM system, since 8-bit data is converted into 14-bit data and recorded,
It is disadvantageous for high-density recording. For high-density recording, it is desirable to directly record data, but as described above, there is a problem that the DC balance shift becomes large.

Further, in the above-mentioned conventional optical disc, since the recording data is embodied by the pit row pattern of the mirror surface M and the pits P formed on the track center Tc, the number of the pits P and the formation thereof are formed. The range will be different for each track depending on the recording data. That is, the pit P in the data section per track
And the mirror surface M do not have the same ratio, and the ratio differs between tracks. This is because when a recording pattern (a pit row pattern composed of pits P and mirror surfaces M) on a stamper is transferred onto a resin substrate by injection molding using a stamper in the manufacture of an optical disc, the inside of the cavity of the molten resin The inflow rate into the cavity is not uniform over the entire cavity due to the unevenness of the unevenness on the stamper, and the adhered state of the molten resin on the stamper varies. As a result, there is a problem that the shape of the pits P of the completed optical disk does not locally become a prescribed shape, and a molding defect such as a chip at a place where the mirror surface M should be formed occurs.

This molding failure often occurs especially in the servo area of the optical disk adopting the sample servo system. That is, this servo area is usually separated from the data section by the mirror section constituted only by the mirror surface M, and therefore the mirror section is continuous in the radial direction of the optical disc. From this, in the manufacturing stage of the optical disc, the molten resin rapidly flows in the portion corresponding to the mirror portion in the outer peripheral direction of the cavity, and the servo portion of the completed optical disc is formed by the continuous mirror portion in the radial direction. A so-called ghost, in which the edge portion of the servo pit is chipped, occurs.

Therefore, in view of the conventional problems as described above,
An object of the present invention is to provide a data recording method for an optical recording medium that can perform data recording in a plurality of recording modes having different recording densities without changing the pit width, the pit length, and the spot size of the reproduction laser beam. It is in. Another object of the present invention is to change the value of DSV without performing modulation such as EFM that causes an increase in the data length even if there is logically "1" or "0" continuous data. It is an object of the present invention to provide a data recording method of an optical recording medium including a first recording mode, which can be brought to zero, and at the same time, the servo control can be stabilized and the recording data density can be increased. Another object of the present invention is to provide a data recording method for an optical recording medium including a second recording mode capable of recording data at a recording density n times that of the first recording mode. It is in. Further, another object of the present invention is to record data of an optical recording medium including a third recording mode in which the recording density is higher than that of the first recording mode or the second recording mode and the data is expressed by multi-valued recording. It is to provide a recording method.

An object of the present invention is to switch the operation mode without shortening the wavelength of the laser light source or increasing the NA of the objective lens, and to record on the recording surface of the optical recording medium in various recording modes. Another object of the present invention is to provide a data recording device for an optical recording medium capable of recording different data. Another object of the present invention is to provide a data recording device for an optical recording medium that can record data on the optical recording medium in the first recording mode and the second recording mode. Another object of the present invention is to provide a data recording device for an optical recording medium capable of recording data on the optical recording medium in the first recording mode and the third recording mode. Another object of the present invention is to provide a data recording device for an optical recording medium that can record data on the optical recording medium in the second recording mode and the third recording mode. Still another object of the present invention is to provide a data recording device for an optical recording medium that can record data on the optical recording medium in the first to third recording modes.

The object of the present invention is to switch the operation mode without shortening the wavelength of the laser light source or increasing the NA of the objective lens, and to record the data recorded on the optical recording medium in various recording modes with different recording densities. It is an object of the present invention to provide a data reproducing device for an optical recording medium capable of reproducing data.
Another object of the present invention is to provide a data reproducing apparatus for an optical recording medium capable of reproducing recorded data recorded on the optical recording medium in the first recording mode and the second recording mode. is there. Another object of the present invention is to provide a data reproducing apparatus for an optical recording medium capable of reproducing recorded data recorded on the optical recording medium in the first recording mode and the third recording mode. is there. Another object of the present invention is to provide a data reproducing apparatus for an optical recording medium capable of reproducing recorded data recorded on the optical recording medium in the second recording mode and the third recording mode. is there. Still another object of the present invention is to provide a data reproducing apparatus for an optical recording medium capable of reproducing recorded data recorded on the optical recording medium in the first to third recording modes.

[0021]

In order to solve the above problems, a data recording method for an optical recording medium according to the first invention is
Express the recorded data with positive logic data and negative logic data,
On a track having a track pitch substantially equal to the spot size of the reproducing light beam on the recording surface of the optical recording medium, with respect to the track center scanned by the reproducing light beam, the inner or outer circumference side The positive logic data is recorded on one side as a pit row consisting of pits and a mirror surface, and the negative logic data is recorded on the other side of the inner circumference side or the outer circumference side as an inverted pit row in which the pits in the pit row and the mirror surface are reversed. The first to record
And the data obtained by a predetermined logical operation between the data recorded in the previous continuous (n-1) tracks and the input data are recorded data of the next track.
A second recording mode is provided in which the above-mentioned recording data is recorded as a pit train composed of pits and a mirror surface on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium. And above first
The data is recorded on the recording surface of the optical recording medium in the second recording mode or the second recording mode.

Further, in the data recording method of the optical recording medium according to the second invention, the recording data is expressed by the positive logic data and the negative logic data, and the spot size of the reproducing light beam on the recording surface of the optical recording medium is set. On the tracks having substantially the same track pitch, with the track center scanned by the reproduction light beam as a reference, the positive logic data is provided on one of the inner peripheral side and the outer peripheral side as a pit row composed of pits and mirror surfaces. In addition to recording, the first recording mode in which the negative logical data is recorded on the other of the inner peripheral side or the outer peripheral side as the inverted pit train in which the pits in the pit train and the mirror surface are reversed, and the previous continuous (n −
1) The data obtained by a predetermined logical operation of the data recorded on one track and the input data is used as the recording data of the next track, and 1 / of the spot size of the reproducing light beam on the recording surface of the optical recording medium is used. Second recording for expressing and recording the recording data on a track having a track pitch of n by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. And recording data on the recording surface of the optical recording medium in the first recording mode or the second recording mode.

The data recording method for an optical recording medium according to the third aspect of the present invention is a data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data. To the recording data of the next track, and to a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium,
The first recording mode in which the above recording data is recorded as a pit row composed of pits and a mirror surface, and the previous continuous (n-
1) The data obtained by a predetermined logical operation of the data recorded on one track and the input data is used as the recording data of the next track, and 1 / of the spot size of the reproducing light beam on the recording surface of the optical recording medium is used. Second recording for expressing and recording the recording data on a track having a track pitch of n by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. And recording data on the recording surface of the optical recording medium in the first recording mode or the second recording mode.

Further, in the data recording method of the optical recording medium according to the fourth aspect of the present invention, the recording data is expressed by positive logical data and negative logical data, and the spot size of the reproducing light beam on the recording surface of the optical recording medium is set. On the tracks having substantially the same track pitch, with the track center scanned by the reproduction light beam as a reference, the positive logic data is provided on one of the inner peripheral side and the outer peripheral side as a pit row composed of a pit and a mirror surface. In addition to recording, the first recording mode in which the negative logical data is recorded on the other of the inner peripheral side or the outer peripheral side as the inverted pit row in which the pits in the pit row and the mirror surface are inverted, and the previous continuous (n −
1) The data obtained by a predetermined logical operation of the data recorded on one track and the input data is used as the recording data of the next track, and 1 / of the spot size of the reproducing light beam on the recording surface of the optical recording medium is used. a second recording mode in which the above-mentioned recording data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of n;
Data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data of the next track, and the reproduction light on the recording surface of the optical recording medium is used. 1 / n of beam spot size
A third recording mode in which the recording data is expressed and recorded on a track having a track pitch of 3 by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. And recording data on the recording surface of the optical recording medium in the first recording mode, the second recording mode, or the third recording mode.

In order to solve the above-mentioned problems, a data recording apparatus for an optical recording medium according to a fifth aspect of the present invention, in a first recording mode, positive logic data obtained by a logical operation of taking positive logic and negative logic of input data. And pit data and inversion pit data in which the negative logical data is used as the recording data of the next track are generated, and in the second recording mode, the previous continuous (n-
1) Arithmetic processing means for generating pit data in which data obtained by a predetermined logical operation of data recorded on one track and input data is recorded data on the next track, and a light beam for recording data is emitted. A light source, a light modulator for intensity-modulating the light beam from the light source according to the pit data from the arithmetic processing means, and a light beam incident from the light source through the light modulator on the optical recording medium. An objective lens for focusing on a recording surface, a moving means for relatively moving a beam spot of a light beam passing through the objective lens in a radial direction of the optical recording medium, and operating in a first recording mode and a second recording mode. In the first recording mode, a track pitch substantially equal to the spot size of the reproducing light beam on the recording surface of the optical recording medium is provided. To the track that, based on the track center scanned by the light beam for the reproduction, and records the positive logic data as a pit string made up of pits and mirror surface on one of the circumferential side or outer circumferential side thereof,
The negative logic data is recorded on the other of the inner peripheral side or the outer peripheral side as an inverted pit row in which the pits in the pit row and the mirror surface are inverted, and in the second recording mode, the previous continuous (n-1) The data obtained by a predetermined logical operation of the data recorded on the book track and the input data is used as the recording data of the next track, and is 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. The above recording data is recorded on a track having a track pitch as a pit string composed of pits and a mirror surface.

Further, in the data recording apparatus of the optical recording medium according to the sixth aspect of the present invention, in the first recording mode, the positive logic data and the negative logic data obtained by the logical operation of the positive logic and the negative logic of the input data are The pit data and the reverse pit data which are the recording data of the track are generated, and in the second recording mode, by the predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data. Arithmetic processing means for generating wobble pit data and non-wobble pit data for recording the obtained data on the next track, a light source for emitting a light beam for data recording, and an arithmetic processing means for the light beam from the light source. An optical modulator for intensity-modulating according to the pit data from, and a light beam from the light source according to the wobble pit data from the arithmetic processing means. A light deflector for fine deflection, an objective lens for converging on the recording surface of the optical recording medium the light beam incident via the optical modulator and the optical deflector from the light source,
Moving means for relatively moving the beam spot of the light beam passing through the objective lens in the radial direction of the optical recording medium;
A control means for switching the operation mode between the first recording mode and the second recording mode is provided, and in the first recording mode, the track pitch is approximately equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. The positive logical data is recorded in a track having a pit row composed of pits and a mirror surface on one of the inner circumference side and the outer circumference side with reference to the track center scanned by the reproduction light beam. The negative logic data is recorded on the other of the inner circumference side or the outer circumference side as an inverted pit row in which the pits in the pit row and the mirror surface are inverted,
In the recording mode, the data obtained by a predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data of the next track, and the recording surface of the optical recording medium is recorded. In the track having a track pitch of 1 / n of the spot size of the reproducing light beam in, the mirror surface, the wobble pits located at a position offset from the track center, and the non-wobble pits located on the track center The recording data is expressed and recorded.

In the data recording apparatus for the optical recording medium according to the seventh aspect of the present invention, in the first recording mode, the previous continuous (n
-1) Pit data in which the data obtained by a predetermined logical operation of the data recorded in one track and the input data is used as the recording data of the next track is generated, and in the second recording mode, the previous continuous ( n-1) arithmetic processing means for generating wobble pit data and non-wobble pit data for recording data of the next track from data obtained by a predetermined logical operation of data recorded on one track and input data, and data A light source for emitting a light beam for recording, an optical modulator for intensity-modulating the light beam from the light source according to the pit data from the arithmetic processing means, and a light beam from the light source from the arithmetic processing means An optical deflector for slightly deflecting in accordance with wobble pit data, and an optical recording medium for an optical beam incident from the light source through the optical modulator and the optical deflector. An objective lens for converging on the recording surface,
Moving means for relatively moving the beam spot of the light beam passing through the objective lens in the radial direction of the optical recording medium;
A control means for switching the operation mode between the first recording mode and the second recording mode is provided, and in the first recording mode, the data and the input data recorded on the previous (n-1) continuous tracks. The data obtained by the predetermined logical operation of is the recording data of the next track, and from the pit and the mirror surface to the track having the track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. The above recording data is recorded as a pit string
In the recording mode, the data obtained by a predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data of the next track, and the recording surface of the optical recording medium is recorded. In the track having a track pitch of 1 / n of the spot size of the reproducing light beam in, the mirror surface, the wobble pits located at a position offset from the track center, and the non-wobble pits located on the track center The recording data is expressed and recorded.

Further, in the data recording apparatus of the optical recording medium according to the eighth aspect of the present invention, in the first recording mode, the positive logic data and the negative logic data obtained by the logical operation of taking the positive logic and the negative logic of the input data are The pit data and the reverse pit data which are the recording data of the track are generated, and in the second recording mode, by the predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data. Pit data having the obtained data as the recording data of the next track is generated, and in the third recording mode, a predetermined logical operation is performed between the data recorded on the previous (n-1) continuous tracks and the input data. The data obtained by the above is provided with an arithmetic processing means for generating wobble pit data and non-wobble pit data for recording data of the next track, and a light beam for data recording. A light source that emits light, an optical modulator that intensity-modulates a light beam from the light source according to pit data from the arithmetic processing unit, and a light beam from the light source according to wobble pit data from the arithmetic processing unit An optical deflector for slightly deflecting, an objective lens for condensing a light beam incident from the light source through the optical modulator and the optical deflector on a recording surface of an optical recording medium, and a light beam passing through the objective lens Means for relatively moving the beam spot of the optical recording medium in the radial direction of the optical recording medium, a first recording mode and a second recording mode.
Recording mode and a control means for switching the operation mode to the third recording mode. In the first recording mode, the track pitch is approximately equal to the spot size of the reproducing light beam on the recording surface of the optical recording medium. On the track, with the track center scanned by the reproduction light beam as a reference, the positive logic data is recorded as a pit row consisting of pits and a mirror surface on one of the inner circumference side and the outer circumference side, and the inner circumference is also recorded. On the other side or the outer peripheral side, the negative logic data is recorded as a reversed pit train in which the pits in the pit train and the mirror surface are reversed, and in the second recording mode, the previous continuous (n-1) tracks are recorded. The data obtained by a predetermined logical operation between the data recorded on the recording medium and the input data is used as the recording data of the next track, and is recorded on the recording surface of the optical recording medium. In the third recording mode, the above recording data is recorded on a track having a track pitch of 1 / n of the spot size of the reproducing light beam as a pit row composed of pits and a mirror surface. −
1) The data obtained by a predetermined logical operation of the data recorded on one track and the input data is used as the recording data of the next track, and 1 / of the spot size of the reproducing light beam on the recording surface of the optical recording medium is used. The recording data is expressed and recorded on a track having a track pitch of n by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. To do.

In order to solve the above problems, a data reproducing apparatus for an optical recording medium according to a ninth aspect of the present invention expresses the recording data by positive logic data and negative logic data, and reproduces the data on the recording surface of the optical recording medium. On a track having a track pitch approximately equal to the spot size of the light beam, with the track center scanned by the reproduction light beam as a reference,
The positive logic data was recorded as a pit row consisting of a pit and a mirror surface on one of the inner circumference side and the outer circumference side, and the pit and the mirror surface in the pit row were reversed on the other of the inner circumference side and the outer circumference side. The first recording mode for recording the negative logic data as an inverted pit string, or the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data As the recording data of the next track, the spot size of the reproducing light beam on the recording surface of the optical recording medium is 1
An optical recording medium that reproduces the recorded data from the optical recording medium on which the data is recorded in a second recording mode in which the recording data is recorded in a track having a track pitch of / n as a pit string consisting of pits and a mirror surface. An optical pickup which is a data reproducing device, irradiates a recording light surface of an optical recording medium with a light beam for reproduction, and outputs a detection signal according to the amount of reflected light or transmitted light of the light beam by the recording surface, Arithmetic processing means for generating an RF signal and a push-pull signal from the detection signal by the optical pickup, and reproducing recorded data from the RF signal and the push-pull signal by a logical operation corresponding to the first recording mode or the second recording mode. And a control means for switching the operation mode between the first reproduction mode and the second reproduction mode. In the first reproduction mode, the first reproduction mode is set. The track on the recording surface on which the data is recorded in the recording mode is scanned by the optical beam for reproduction by the optical pickup to reproduce the recorded data in the first recording mode from the optical recording medium, and the second reproduction mode. Then, the track on the recording surface on which the data is recorded in the second recording mode is scanned by the reproduction optical beam by the optical pickup to reproduce the recording data in the second recording mode from the optical recording medium. It is characterized by that.

Further, in the data reproducing apparatus for an optical recording medium according to the tenth aspect of the invention, the recording data is expressed by positive logic data and negative logic data, and the spot size of the reproducing light beam on the recording surface of the optical recording medium is used. On the tracks having substantially the same track pitch, with the track center scanned by the reproduction light beam as a reference, the positive logic data is provided on one of the inner peripheral side and the outer peripheral side as a pit row composed of a pit and a mirror surface. A first recording mode in which the negative logic data is recorded on the other side of the inner circumference side or the outer circumference side as the inverted pit row in which the pits in the pit row and the mirror surface are inverted, or the previous continuous mode ( n-1) The data obtained by a predetermined logical operation of the data recorded on the number of tracks and the input data is used as the recording data of the next track. , A mirror surface, a wobble pit located at a position deviated from the track center, and a position on the track center on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium. A data reproducing apparatus for an optical recording medium, which reproduces recorded data from an optical recording medium on which data is recorded in a second recording mode in which the recorded data is expressed and recorded by non-wobble pits. An optical pickup for irradiating the recording surface with a reproducing light beam and outputting a detection signal corresponding to the amount of reflected light or transmitted light of the light beam by the recording surface; and an RF signal from the detection signal by the optical pickup. Generate a push-pull signal,
Arithmetic processing means for reproducing recorded data from the RF signal and push-pull signal by logical operation corresponding to the first recording mode or the second recording mode, and operating modes for the first reproducing mode and the second reproducing mode. In the first reproduction mode, the track on the recording surface on which the data is recorded in the first recording mode is scanned with the reproduction light beam by the optical pickup, and the first reproduction mode is provided.
Recording data in the recording mode is reproduced from the optical recording medium, and in the second reproducing mode, the track on the recording surface on which the data is recorded in the second recording mode is scanned by the reproducing optical beam by the optical pickup. Then, the recording data in the second recording mode is reproduced from the optical recording medium.

The data reproducing apparatus for an optical recording medium according to the eleventh aspect of the invention is data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data. As the recorded data of the next track,
A second recording mode in which the above-mentioned recording data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of the spot size of a reproduction light beam on the recording surface of an optical recording medium, or Data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data of the next track, and the reproduction light on the recording surface of the optical recording medium is used. The recorded data is represented on a track having a track pitch of 1 / n of the beam spot size by a mirror surface, a wobble pit located at a position offset from the track center, and a non-wobble pit located on the track center. Data in an optical recording medium for reproducing recorded data from an optical recording medium on which data is recorded in a second recording mode An optical pickup, which is a raw device, irradiates a recording light surface of an optical recording medium with a reproduction light beam, and outputs a detection signal according to the amount of reflected light or transmitted light of the light beam by the recording surface, and Arithmetic processing means for generating an RF signal and a push-pull signal from a detection signal by the optical pickup, and reproducing recorded data by a logical operation corresponding to the first recording mode or the second recording mode from the RF signal and the push-pull signal. , A control means for switching the operation mode between a first reproduction mode and a second reproduction mode. In the first reproduction mode, the track on the recording surface on which the data is recorded in the first recording mode is the optical The pickup is scanned with a reproduction light beam to reproduce the record data in the first recording mode from the optical recording medium, and in the second reproduction mode, the second recording mode is set. The data recorded in the recording mode is scanned on the track on the recording surface by the optical beam for reproduction by the optical pickup to reproduce the recorded data in the second recording mode from the optical recording medium. is there.

Furthermore, in the data reproducing apparatus for an optical recording medium according to the twelfth aspect of the invention, the recording data is expressed by positive logic data and negative logic data, and the spot size of the reproduction light beam on the recording surface of the optical recording medium is set. On the tracks having substantially the same track pitch, with the track center scanned by the reproduction light beam as a reference, the positive logic data is provided on one of the inner peripheral side and the outer peripheral side as a pit row composed of pits and mirror surfaces. The first recording mode in which the negative logic data is recorded on the other side of the inner circumference side or the outer circumference side as the inverted pit row in which the pits in the pit row and the mirror surface are inverted is continuously recorded (n-
1) The data obtained by a predetermined logical operation of the data recorded on one track and the input data is used as the recording data of the next track, and 1 / of the spot size of the reproducing light beam on the recording surface of the optical recording medium is used. A second recording mode in which the above recording data is recorded in a track having a track pitch of n as a pit string consisting of pits and a mirror surface, or data recorded in the previous (n-1) continuous tracks. The data obtained by a predetermined logical operation with the input data is used as the recording data of the next track, and the spot size of the reproducing light beam on the recording surface of the optical recording medium is 1
A third surface for recording and recording the recording data on a track having a track pitch of / n by a mirror surface, a wobble pit located at a position deviated from the track center, and a non-wobble pit located on the track center. A data reproducing apparatus for an optical recording medium, which reproduces recorded data from an optical recording medium on which data is recorded in a recording mode, wherein a recording surface of the optical recording medium is irradiated with a reproducing light beam,
An optical pickup that outputs a detection signal according to the amount of reflected light or transmitted light of the light beam by the recording surface, and an RF signal and a push-pull signal are generated from the detection signal by the optical pickup, and the RF signal and the push-pull are generated. Arithmetic processing means for reproducing recorded data from a signal by logical operation corresponding to the first recording mode, the second recording mode or the third storage mode, a first reproducing mode, a second reproducing mode and a third reproducing mode. And a control means for switching the operation mode to the reproduction mode. In the first reproduction mode, a track on the recording surface on which data is recorded in the first recording mode is scanned by the optical beam for reproduction by the optical pickup. Then, the recording data in the first recording mode is reproduced from the optical recording medium, and in the second reproducing mode, the data is recorded in the second recording mode. The track on the recording surface is scanned by the reproduction optical beam by the optical pickup to reproduce the record data in the second recording mode from the optical recording medium. In the third reproduction mode, the third recording mode is set. The track on the recording surface on which the data is recorded is scanned by the optical beam for reproduction by the optical pickup to reproduce the recorded data in the third recording mode from the optical recording medium. .

[0033]

In the first recording mode of the data recording method for the optical recording medium according to the first aspect of the present invention, the recording data is expressed by the positive logic data and the negative logic data, and the track center scanned by the reproducing light beam is set. As a reference, the positive logic data is recorded as a pit row on one of the inner circumference side and the outer circumference side, and the negative logic data is recorded as an inverted pit row on the other inner circumference side or the outer circumference side. In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track, and the optical recording is performed. The recording data is recorded as a pit train on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the medium.
As a result, data recording with different recording densities is performed on the recording surface of the optical recording medium in the first recording mode and the second recording mode.

In the first recording mode of the data recording method for the optical recording medium according to the second aspect of the present invention, the recording data is expressed by the positive logic data and the negative logic data for reproduction on the recording surface of the optical recording medium. On a track having a track pitch approximately equal to the spot size of the light beam, with the track center scanned by the reproduction light beam as a reference, the positive logic data as a pit row on one of the inner circumference side and the outer circumference side. In addition to recording, the negative logic data is recorded as an inverted pit string on the other side of the inner circumference side or the outer circumference side. In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track, and the optical recording is performed. On the track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the medium, the recording data is recorded on the mirror surface, the wobble pit located at a position deviated from the track center, and the track center. It is recorded as a pit row with the non-wobble pits located. This allows
Data recording with different recording densities is performed on the recording surface of the optical recording medium in the first recording mode and the second recording mode.

In the first recording mode of the data recording method for the optical recording medium according to the third aspect of the invention, the predetermined data of the data recorded on the previous (n-1) continuous tracks and the input data are determined. The data obtained by the logical operation is used as the recording data of the next track, and the recording data is recorded as a pit string on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. . In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track, and the optical recording is performed. On the track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the medium, the recording data is recorded on the mirror surface, the wobble pit located at a position deviated from the track center, and the track center. It is recorded as a pit row with the non-wobble pits located. As a result, data recording with different recording densities is performed on the recording surface of the optical recording medium in the first recording mode and the second recording mode.

Further, in the first recording mode of the data recording method for the optical recording medium according to the fourth aspect of the present invention, the recording data is expressed by the positive logic data and the negative logic data, and is used for reproduction on the recording surface of the optical recording medium. On a track having a track pitch approximately equal to the spot size of the light beam, with the track center scanned by the reproduction light beam as a reference, the positive logic data as a pit row on one of the inner circumference side and the outer circumference side. In addition to recording, the negative logic data is recorded as an inverted pit string on the other side of the inner circumference side or the outer circumference side. In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track, and the optical recording is performed. The recording data is recorded as a pit train on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the medium. Furthermore, in the third recording mode,
Data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data of the next track, and the reproduction light on the recording surface of the optical recording medium is used. 1 / n of beam spot size
The recorded data is recorded on a track having a track pitch of 1 as a pit row consisting of a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. As a result, data recording with different recording densities is performed on the recording surface of the optical recording medium in the first recording mode, the second recording mode, and the third recording mode.

In the data recording apparatus for the optical recording medium according to the fifth aspect of the present invention, the operation mode is switched between the first recording mode and the second recording mode by the control means. In the first recording mode, the pit data and the inverted pit data in which the recording data of the next track is expressed by the positive logic data and the negative logic data are generated by the logical operation of the input data in the arithmetic processing means by the positive logic and the negative logic. Then, on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium, with respect to the center of the track scanned by the reproduction light beam, the inner side or the outer periphery thereof. The positive logic data is recorded as a pit string on one side, and the negative logic data is recorded as an inverted pit string on the other of the inner circumference side and the outer circumference side. In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks by the arithmetic processing means and the input data is transferred to the next track. Recorded data is recorded as a pit train on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. As a result, data recording with different recording densities is performed on the recording surface of the optical recording medium in the first recording mode and the second recording mode.

In the data recording apparatus for the optical recording medium according to the sixth aspect of the present invention, the control means switches the operation mode between the first recording mode and the second recording mode. In the first recording mode, the pit data and the inverted pit data in which the recording data of the next track is expressed by the positive logic data and the negative logic data are generated by the logical operation of the input data in the arithmetic processing means by the positive logic and the negative logic. Then, on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium, with respect to the center of the track scanned by the reproduction light beam, the inner side or the outer periphery thereof. The positive logic data is recorded as a pit string on one side, and the negative logic data is recorded as an inverted pit string on the other of the inner circumference side and the outer circumference side. In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks by the arithmetic processing means and the input data is transferred to the next track. The recording data is used as a wobble pit located at a position deviated from the mirror surface and the track center on a track having a track pitch of 1 / n of the spot size of the reproduction light beam on the recording surface of the optical recording medium. Then, it is recorded as a pit string of non-wobble pits located on the track center. As a result, data recording with different recording densities is performed on the recording surface of the optical recording medium in the first recording mode and the second recording mode.

In the data recording apparatus for the optical recording medium according to the seventh aspect of the invention, the operation mode is switched by the control means between the first recording mode and the second recording mode. In the first recording mode, the previous consecutive (n-
1) The data obtained by a predetermined logical operation of the data recorded on one track and the input data is used as the recording data of the next track, and this recording data is the spot of the reproduction light beam on the recording surface of the optical recording medium. A pit string is recorded on a track having a track pitch of 1 / n of the size. In the third recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks by the arithmetic processing means and the input data is transferred to the next track. Wobble pits that are recorded data and are located on a track having a track pitch that is 1 / n of the spot size of the reproduction light beam on the recording surface of the optical recording medium and that are offset from the mirror surface and the track center. Then, it is recorded as a pit string of non-wobble pits located on the track center. As a result, data recording with different recording densities is performed on the recording surface of the optical recording medium in the first recording mode and the second recording mode.

In the data recording apparatus for the optical recording medium according to the eighth aspect of the present invention, the control means switches the operation mode to the first recording mode, the second recording mode and the third recording mode. In the first recording mode, the pit data and the inverted pit data in which the recording data of the next track is expressed by the positive logic data and the negative logic data are generated by the logical operation of the input data in the arithmetic processing means by the positive logic and the negative logic. Then, on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium, with respect to the center of the track scanned by the reproduction light beam, the inner side or the outer periphery thereof. The positive logic data is recorded as a pit string on one side, and the negative logic data is recorded as an inverted pit string on the other of the inner circumference side and the outer circumference side. In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks by the arithmetic processing means and the input data is transferred to the next track. The recording data is used as the recording data, and the recording data has a spot size of 1 on the recording surface of the optical recording medium.
Recording as a pit string on a track having a track pitch of / n. Further, in the third recording mode, data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks by the arithmetic processing means and the input data is recorded on the next track. As data, on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium,
The above recorded data is recorded as a pit row including a mirror surface, wobble pits located at a position deviated from the track center, and non-wobble pits located on the track center. As a result, data recording with different recording densities is performed on the recording surface of the optical recording medium in the first recording mode, the second recording mode, and the third recording mode.

In the data reproducing apparatus for an optical recording medium according to the ninth aspect of the invention, the control means switches the operation mode between the first reproducing mode and the second reproducing mode. In the first reproduction mode, the recording data is expressed by positive logic data and negative logic data, and the reproduction is performed on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. The positive logic data is recorded as a pit row consisting of pits and a mirror surface on one of the inner circumference side or the outer circumference side with reference to the track center scanned by the light beam for On the other hand, it is a reproduction mode for the first recording mode in which the negative logic data is recorded as an inverted pit train in which the pits in the pit train and the mirror surface are reversed, and in the first reproduction mode, the first recording is performed. Generated by scanning the track on the recording surface of the optical recording medium in which the data is recorded in the mode with the optical beam for reproduction by the optical pickup From F signal and the push-pull signal, it performs a logical operation corresponding to the first recording mode by arithmetic processing means,
The recorded data in the first recording mode is reproduced. Also,
In the second reproduction mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track, and the optical recording medium is used. Is a reproduction mode for the second recording mode in which the above-mentioned recording data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of the spot size of the reproduction light beam on the recording surface of In this second playback mode, the second
In the recording mode, the n-th track on the recording surface of the optical recording medium is scanned by the optical beam for reproduction by the optical pickup, and the RF signal and the push-pull signal are generated from the RF signal and the push-pull signal. A logical operation corresponding to the second recording mode is performed to reproduce the recording data of the second recording mode from the optical recording medium. As a result, the recording data having different recording densities recorded in the first recording mode or the second recording mode is reproduced from the optical recording medium.

In the data reproducing apparatus for an optical recording medium according to the tenth aspect of the invention, the control means switches the operation mode between the first reproducing mode and the second reproducing mode. First above
In the reproduction mode, the recording data is represented by positive logic data and negative logic data, and the reproduction light is recorded on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. With the track center scanned by the beam as a reference, the positive logic data is recorded as a pit row consisting of pits and a mirror surface on one of the inner peripheral side or the outer peripheral side, and the above-mentioned on the other inner or outer peripheral side. A reproduction mode for the first recording mode in which the negative logic data is recorded as an inverted pit string in which pits and mirror surfaces in a pit string are reversed, and in the first reproduction mode, data in the first recording mode is recorded. RF signal generated by scanning a track on the recording surface of an optical recording medium in which is recorded with a light beam for reproduction by an optical pickup A micro-push-pull signal, the processing means performing a logic operation corresponding to said first recording mode, reproducing recorded data of the first recording mode. Also, the second reproduction mode is the same as the previous continuous (n
-1) The data obtained by a predetermined logical operation of the data recorded on one track and the input data is used as the recording data of the next track, and the spot size of the reproducing light beam on the recording surface of the optical recording medium is 1 The second recorded data is expressed and recorded on a track having a track pitch of / n by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. This is a reproduction mode for the recording mode, and in the second reproduction mode,
In the recording mode, the n-th track on the recording surface of the optical recording medium is scanned by the optical beam for reproduction by the optical pickup, and the RF signal and the push-pull signal are generated from the RF signal and the push-pull signal. A logical operation corresponding to the second recording mode is performed to reproduce the recording data of the second recording mode from the optical recording medium. As a result, the recording data having different recording densities recorded in the first recording mode or the second recording mode is reproduced from the optical recording medium.

Further, in the data reproducing apparatus for the optical recording medium according to the eleventh invention, the control means switches the operation mode between the first reproducing mode and the second reproducing mode. First above
In the reproduction mode, the data obtained by a predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data of the next track,
A reproduction mode for the first recording mode in which the record data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of the spot size of the reproduction light beam on the recording surface of the optical recording medium. In the first reproduction mode, n on the recording surface of the optical recording medium on which the data is recorded in the second recording mode.
The logical operation corresponding to the first recording mode is performed by the arithmetic processing means from the RF signal and the push-pull signal generated by scanning the book track with the reproduction light beam by the optical pickup to obtain the first signal. The recorded data in the recording mode of No. 2 is reproduced from the optical recording medium. In the second reproduction mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track, and On a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the recording medium,
A reproduction mode for the second recording mode in which the recording data is expressed and recorded by a mirror surface, a wobble pit located at a position deviated from the track center, and a non-wobble pit located on the track center. In the second reproduction mode, an RF signal generated by scanning n tracks on the recording surface of the optical recording medium in which data is recorded in the second recording mode with the reproduction optical beam by the optical pickup, From the push-pull signal, the arithmetic processing means performs a logical operation corresponding to the second recording mode to reproduce the recording data in the second recording mode from the optical recording medium. As a result, the recording data having different recording densities recorded in the first recording mode or the second recording mode is reproduced from the optical recording medium.

Further, in the data reproducing apparatus for the optical recording medium according to the twelfth invention, the operation mode is set to the first mode by the control means.
The reproduction mode, the second reproduction mode, and the third reproduction mode are switched. In the first reproduction mode, the recording data is expressed by positive logic data and negative logic data, and the reproduction is performed on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. The positive logic data is recorded as a pit row consisting of pits and a mirror surface on one of the inner circumference side or the outer circumference side with reference to the track center scanned by the light beam for On the other hand, it is a reproduction mode for the first recording mode in which the negative logic data is recorded as an inverted pit train in which the pits in the pit train and the mirror surface are reversed, and in the first reproduction mode, the first recording is performed. Generated by scanning the track on the recording surface of the optical recording medium in which the data is recorded in the mode with the optical beam for reproduction by the optical pickup From F signal and the push-pull signal, it performs a logical operation corresponding to the first recording mode by arithmetic processing means, for reproducing the recorded data of the first recording mode. In the second reproduction mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track, and the optical recording medium is used. Second, the above-mentioned record data is recorded as a pit row composed of pits and a mirror surface on a track having a track pitch of 1 / n of the spot size of the reproduction light beam on the second recording surface.
In the second reproduction mode, a n-th track on the recording surface of the optical recording medium in which the data is recorded in the second recording mode is reproduced by the optical pickup. From the RF signal and the push-pull signal generated by scanning with the light beam, the arithmetic processing means performs a logical operation corresponding to the second recording mode, and the recording data of the second recording mode is recorded from the optical recording medium. Reproduce. In the third reproduction mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track, and A mirror surface, a wobble pit located at a position deviated from the track center, on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of a recording medium;
By the non-wobble pit located on the track center,
A reproducing mode for a third recording mode in which the recording data is expressed and recorded, and in the third reproducing mode, n on the recording surface of the optical recording medium in which the data is recorded in the third recording mode. From the RF signal and the push-pull signal generated by scanning the book track with the reproduction light beam by the optical pickup, the arithmetic processing means performs a logical operation corresponding to the third recording mode, and the third signal is generated. The recorded data in the recording mode of No. 2 is reproduced from the optical recording medium. As a result, the record data having different recording densities recorded in the first recording mode, the second recording mode, or the third recording mode is reproduced from the optical recording medium.

[0045]

Embodiments of the data recording method for an optical recording medium, the data recording apparatus for an optical recording medium, and the data reproducing apparatus for an optical recording medium according to the present invention will be described below in detail with reference to the drawings.

First, an embodiment of a data recording method for an optical recording medium according to the present invention will be described with reference to FIGS. 1 to 17. First, an optical recording medium (on which data is recorded by this data recording method ( Hereinafter, one example will be simply described as an optical disk) with reference to FIGS.

An optical disc on which data is recorded by the data recording method according to this embodiment is, for example, of a type that is rotationally driven by a CAV (constant angular velocity) method, and its recording format is such that one track is composed of a plurality of sectors. , Each sector is composed of a plurality of segments. Then, each segment is divided into a servo area Zs having servo pits and a data area Zd in which original data is recorded. Further, the servo area Zs is composed of a mirror section Zm composed of only a mirror surface and a servo section Zss composed of arrayed servo pits.
Further, the servo section Zss is separated from the data area Zd by the mirror section Zm. That is, the servo area Z
In s, the servo part Zss is arranged in the central part thereof, and the mirror parts Zm are arranged on both sides thereof.

In the first recording mode, the recording surface has a track pitch equal to the spot size of the reproducing light beam, and the track center scanned by the reproducing light beam is used as a reference for the inner circumference side. Alternatively, a pit row composed of pits and a mirror surface formed on one of the outer peripheral sides, and a pit row and an inverted pit row in which the mirror surface is reversed are formed on the other of the inner peripheral side or the outer peripheral side. Express the data and record the data on the track on the recording surface.

As shown in FIGS. 1 and 2, the recording format of the optical disc in which data is recorded in the first recording mode is composed of a pit P and a mirror surface M on the inner peripheral side of the track center Tc as a reference. A pit row is formed, and an inverted pit row in which the pits P in the pit row on the inner circumference side and the mirror surface M are inverted is formed on the outer peripheral side. One track of data is composed of the inverted pit train.

Specifically, the diameter of the spot of the reproducing laser beam on the recording surface is set to be 1.5 to 1. 1 which is the same as that used in, for example, a compact disc reproducing apparatus which has been conventionally used. If it is 6 μm, the pit P having a pit width d of 0.5 μm is formed on the inner peripheral side and the outer peripheral side with respect to the track center Tc as in the conventional compact disc.

Further, the distance between the track centers Tc, that is, the track pitch is 1.6 μm, and as shown in FIG. 1A, one track (for example, the first track T ₁ ) is used.
And the distance t _a between the outer peripheral side of the inverted pit string in the data region Zd of the track adjacent to the pit string and the track on the inner circumference side example in the data area Zd of the pit string on the inner peripheral side of the one track T ₁ It is assumed that the distance t _b between the inverted pit rows on the outer peripheral side is the same.

Therefore, in the optical disc in which data is recorded in the first recording mode in this embodiment, an inner peripheral pit row is formed at a position ¼ track pitch away from the track center Tc to the inner peripheral side. The pit row on the outer peripheral side is formed at a position ¼ track pitch away from the track center Tc on the outer peripheral side. That is, pit rows are formed in the track direction at every 1/2 track pitch in the radial direction of the optical disc.

Spot BS of the laser beam for reproduction
Scans on the track center Tc and has a spot size including the inner pit P and the outer pit P in the spot BS.

Looking at the relationship between pit formation on the inner and outer peripheral sides of the track center Tc in the process of scanning by the spot BS, when the pit P is on the inner peripheral side,
The outer peripheral side is the mirror surface M, and when the inner peripheral side is the mirror surface M, the pit P is formed on the outer peripheral side.

Therefore, as long as the spot BS scans the recording data portion Zw of the data area Zd on this optical disc, either pit P is always present in the spot BS.

In addition, in the optical disc in which data is recorded in the first recording mode in this embodiment, a clock signal is generated from a clock mark Mc, which will be described later, formed in the servo section Zss of the servo area Zs during reproduction. Then, the pit string and the inverted pit string in the data area Zd are reproduced based on the output timing of the generated clock signal. In FIG. 1A and FIG. 2A, vertical ruled lines schematically show the output timing of the clock signal.

From this fact, as shown in FIG.
The start and end of the pit P in the pit row and the inverted pit row are formed in synchronization with the output timing of the clock signal. Further, the structure of the reproduction logical data for the pit string is such that the boundary between the pit P and the mirror surface M (that is, the start end and the end) is logically "1", and the pit P other than the boundary is
The portion (and the portion of the mirror surface M) is logically "0".

The servo section Z in the servo area Zs
As shown in FIG. 1A, ss is sandwiched by mirror portions Zm formed on both sides in the track direction, and the servo portion Z
The start end of ss is arranged at a position shifted by 1.5 clocks from the end of the data area Zd, and the end of the servo section Zss is
It is arranged at a position shifted by 3.5 clocks from the beginning of the data area Zd.

The array pattern of pits (servo pits) P constituting the servo section Zss is different for every three tracks. More specifically, the servo section Zss is divided every two clocks from the start end, and the first division is performed in the A area,
When the next section is the B area and the last section is the C area, the combination of pit arrays included in each area is divided into three patterns.

That is, in the illustrated example, the first track T ₁
On the inner peripheral side of, pits P are provided in areas A and C, respectively.
Are formed, and pits P are formed from the area A to the area B on the outer peripheral side. That is, the area A is
There are pits P on both the inner and outer circumference sides, and there are pits P on the outer circumference side of the B area and on the inner circumference side of the C area. In the first track T1,
Each pit P in the area is a clock mark M for clock detection
Each of the pits P in the B and C areas is used as a servo mark Ms for detecting a tracking error.

Next, a pit P is formed from the B area to the C area on the inner peripheral side of the second track T2, and a pit P is formed on the A area and the C area on the outer peripheral side. There is. That is, the area C has pits P on both the inner and outer circumference sides, the area A has outer pits, and the area B has pits P on the inner circumference side.
In the second track T2, each pit P in the C area is used as a clock mark Mc for clock detection, and each pit P in the A and B areas is used as a servo mark Ms for tracking error detection.

Next, a pit P is formed from the area A to the area B on the inner peripheral side of the third track T3, and a pit P is formed from the area B to the area C on the outer peripheral side. . That is, the area B has pits P on both the inner and outer circumference sides, the area A has inner pits, and the area C has outer pits P on the outer circumference side.
In the third track T3, each pit P in the B area is used as a clock mark Mc for clock detection, and each pit P in the A and C areas is used as a servo mark Ms for tracking error detection.

In the second recording mode, the track pitch is 1 / n of the spot size of the reproducing light beam on the recording surface, and the data is recorded on the previous (n-1) continuous tracks. The data obtained by a predetermined logical operation of the data and the input data is used as the recording data, and the recording data is expressed by the pit train including the pits and the mirror surface and recorded on the next track on the recording surface.

As shown in FIG. 3, the recording format in the data portion Zd of the optical disc in which the data is recorded in the second recording mode has a track pitch of 1 / n of the spot diameter of the reproducing laser beam BS on the recording surface. And pits are formed based on the recording data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data.

Specifically, in this optical disc, the track pitch Tp is set so that two adjacent tracks #n and # n + 1 are simultaneously scanned with respect to the diameter of the spot BS of the reproduction laser beam. There is.

For example, tracks # 1, # 2, # 3, # 4
It is assumed that the pit P is formed in the pit P, and the pit P has a pit width of 0.5 μm and a pit length of 0.86 μm. Further, the track pitch Tp is set to 0.8 μm, which is about ½ of that when the diameter of the spot BS of the reproduced laser beam to be scanned is 1.5 to 1.6 μm.

The reproduction scanning by the beam spot BS of the reproduction laser beam is executed under the tracking control at the intermediate position of each adjacent track. Therefore, the tracks # 1 and # 2 are recorded.
The information of tracks # 1 and # 2 is read by scanning the spot scanning center R ₁ between the beam spot BS and the spot scanning center R ₂ similarly.
There track information # 2 and # 3 is read by scanning, the spot scanning center R ₃ beam spot BS
The information on the tracks # 3 and # 4 is read by scanning.

As shown in FIG. 3, the pits P in the optical disc on which data is recorded in the second recording mode are as follows.
For example, when "1" is continuous as recording data, it is formed so as to be combined with an adjacent pit on the same track and its length becomes a value proportional to the number of continuous "1" s.

Track # (number) i (i = 1, 2, 3,
...), the pit P recorded in the previous track #
It is formed on the basis of data obtained by a predetermined logical operation between the data recorded in (i-1) and the input data, for example, logical coincidence (or equality) which is a negative logic of exclusive OR.

Specifically, for example, in Table 1, track #i
As shown in the input data for (i = 1 to 3),

[0071]

[Table 1]

The input data for track # 1 is (1,0,1,0,1,0,1,0,1,0), and the input data for track # 2 is (0,1,1,1,0). , 0,0,1,1,0), the input data for track # 3 is (1,1,1,0,0,0,1,1,1,1), and the input data for track # 4 is When (0,0,1,1,1,1,1,0,0,0,1) and the track # 1 is the innermost track, the data shown in Table 2 is set for each track #i (i = 1-3)
Recorded data.

[0073]

[Table 2]

That is, in the recording data for the track # 1, since the pit P is not formed inside (in front of) the innermost track, the initial value of the recording data is, for example, "0".
Then, the input data (1,0,1,0,1,0,1,0,1,0) is directly used as the recording data.

The recording data for the next track # 2 is
The data (0,0,1,0,0,1,0,0,1,1) is obtained by logically matching the recording data for the track # 1 and the input data for the track # 2.

The recorded data for the next track # 3 is
The data (0,0,1,1,1,0,0,0,1,1) is obtained by logically matching the input data of the recording data for track # 2 and the input data of this track # 3.

Similarly, recording data for each track #i is obtained, and a pit P is formed based on these recording data when the recording data is "1", for example.

In the second recording mode, the pit width and the pit length are set to the same size as in the first recording mode, and data recording is performed at a recording density n (for example, n = 2) times. Become. The predetermined logical operation described above is not limited to logical coincidence, and may be other logical operation processing such as exclusive OR or logical OR.

Further, in the third recording mode, the track pitch is 1 / n of the spot size of the reproducing light beam on the recording surface, and recording is performed on the previous (n-1) continuous tracks. The data obtained by a predetermined logical operation of the data and the input data is used as the recording data, and the recording data is recorded by the mirror portion, the wobble pits located at a position deviated from the track center, and the non-wobble pits located on the track center. Express and record on the next track on the recording surface of the optical recording medium.

That is, as shown in FIG. 4, the recording format in the data portion Zd of the optical disc 1 on which data is recorded in the third recording mode is 1 / n of the spot diameter of the reproducing laser beam BS on the recording surface. Pits are formed on the basis of the record data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data. There is.

Specifically, the optical disc 1 is designed so that two adjacent tracks #n and # n + 1 are simultaneously scanned with respect to the diameter of the spot BS of the reproduction laser beam.
The track pitch Tp is set, and in each of the tracks #n and # n + 1, the pit P is a pit (non-wobble pit (A)) located on the track center, and is deviated in the + α direction from the track center. By providing pits (wobble pits (B)), pits (wobble pits (C)) that are located in the −α direction from the track center, and by providing a mirror surface (M) on which pits P are not formed, Four-valued information is represented.

Each of the four-valued information is A, B, C, M
, The track #n as shown in FIG.
Information A₁, B₁, C₁, M₁, On track # n + 1
Is information A₂, B₂, C₂, M₂There is a beam
Spot BS simultaneously tracks #n and # n + 1
Information A by being scanned into₁，
B ₁, C₁, M₁And information A₂, B₂, C₂, M₂Set of
16 types of data representation by combining (Pattern P₁~ P
₁₆) Is possible.

Therefore, the data to be recorded on the track of this optical disk is the data type (A, B,
By being modulated into four values according to (C, M), 16-value data of the patterns P _{1 to} P ₁₆ is reproduced.

For example, as shown in FIG. 5A, if pits P are formed on tracks # 1, # 2, # 3, and # 4, the pits P have a pit width of 0.5 μm, a pit length of 0. 8
6 μm. Further, the track pitch Tp has a diameter of the spot BS of the reproduced laser beam to be scanned that is 1.5 to 1.
When it is 6 μm, it is set to 0.8 μm, which is about ½ of that.

The reproduction scanning by the beam spot BS of the reproduction laser beam is performed under the tracking control at the intermediate position of each adjacent track. Therefore, the tracks # 1 and # 2 are reproduced.
The information of tracks # 1 and # 2 is read by scanning the spot scanning center R ₁ between the beam spot BS and the spot scanning center R ₂ similarly.
There track information # 2 and # 3 is read by scanning, the spot scanning center R ₃ beam spot BS
The information on the tracks # 3 and # 4 is read by scanning.

FIG. 5B shows the information recorded on each of the tracks # 1 to # 4 as A, B, C and M. Then, by scanning R ₁ , R ₂ , and R ₃ , as a combination of the information of FIG. 5B, as shown in FIG.
16 values of _{1 to} P ₁₆ will be extracted. For example, of the information of tracks # 1 and # 2 obtained by scanning R ₁ , information (A, B) is reproduced as pattern P ₂ and information (M, M) is reproduced as pattern P ₁₆ . The recording capacity of this optical disk is logically “1” depending on whether or not the pit P is present.
This is a dramatic increase over the conventional optical disc that reproduces binary "0".

The information of A, B, C, and M is made to correspond to the logical values "11", "10", "01", and "00" of the recording data, or by the adjacent pairs of tracks (that is, , Patterns P _{1 to} P ₁₆ ) are made to correspond to 4-bit data to generate print data by A, B, C, and M.

On the other hand, as shown in FIG. 6, the servo section Zs is arranged so as to be sandwiched by the mirror sections Zm formed on both sides in the track direction. The array pattern of the pits (servo pits) P forming the servo section Zs is different for every three tracks. Specifically, the servo section Zs is divided into three parts at equal intervals from the beginning to the end, the first section is the area A, the next section is the area B, and the last section is the area C.
When the area is defined, the combination of pit arrays included in each area is divided into three patterns.

That is, in the illustrated example, first, with respect to the first spot scanning center R ₁ , the outer peripheral side track # 1
Has a shape in which pits P are formed from the area A to area B, and the track # 2 on the inner peripheral side has a shape in which pits P are formed from area B to area C. That is, the area B has pits P on both the inner and outer circumference sides, the area A has inner pits, and the area C has pits P on the outer circumference side. When the beam spot BS scans the center of # 2 (first spot scanning center R ₁ ), each pit P in the B area is used as a clock mark for clock detection, and each pit P in the A area and the C area is Used as a servo mark for tracking error detection.

Next, regarding the second spot scanning center R ₂ , the track # 2 on the outer peripheral side is B as described above.
The pits P are formed from the area to the area C, and the track # 3 on the inner circumference side has the pits P formed in the areas A and C, respectively. That is, C
The area has pits P on both the inner and outer circumference sides, the area A has inner pits and the area B has outer pits P on the outer circumference side. Set the center (second spot scanning center R ₂ ) to the beam spot B.
When S scans, each pit P in the C area is used as a clock mark for clock detection, and each pit P in the A area and B area is used as a servo mark for tracking error detection.

Next, regarding the third spot scanning center R ₃ , the track # 3 on the outer peripheral side is A as described above.
The pit P is formed in each of the area and the area C, and the track # 4 on the inner peripheral side has the pit P formed in the area A to the area B. That is, A
The area has pits P on both the inner and outer circumference sides, the area B has pits P on the inner circumference side, and the area C has pits P on the outer circumference side. The center (the third spot scanning center R ₃ ) is set to the beam spot B.
When S scans, each pit P in the A area is used as a clock mark for clock detection, and each pit P in the B area and C area is used as a servo mark for tracking error detection.

Next, the manufacturing process of the optical disc according to the above example will be described. The optical disc manufacturing process of the above example is roughly divided into a master process (mastering process) and a disc forming process (replication process).
It is divided into

The master process is a process until a metal master (stamper) used in the disc forming process is completed, and the disc forming process is a process of mass-producing optical discs which are replicas of the master using the stamper. Is.

Specifically, in the master process, a photoresist is applied to a polished glass substrate, and data (pit string information) is recorded on the photoresist by exposure with a laser beam. That is, laser cutting is performed. The data to be recorded must be prepared in advance,
This preparation step is also called premastering.

When the cutting is completed, a predetermined process such as development is performed, and then information is transferred onto the metal surface by, for example, electroforming to produce a stamper necessary for duplicating the optical disc.

Thereafter, using the stamper manufactured as described above, information is transferred onto a resin substrate by, for example, an injection method, a light reflecting film is formed on the information, and then a desired disk form is formed. Processing such as processing is performed to complete the final product (optical disc).

Therefore, in this case, the device used for recording data on the optical disk is a so-called laser cutting device for drawing pit string information with a laser beam on a photoresist formed on a glass substrate.

The data recording method according to the present invention is carried out by the data recording apparatus according to the present invention having the structure shown in the block diagram of FIG. 7, for example.

The data recording device shown in the block diagram of FIG. 7 is a laser cutting device to which the present invention is applied, and is a glass substrate 11 having a photoresist coated on its surface.
An optical unit 10 that irradiates a laser beam Lw for recording to perform cutting, a driving unit 20 that rotationally drives the glass substrate 11, and converts input data into recording data.
A signal processing unit 3 for controlling the optical unit 10 and the driving unit 20.
It consists of 0 and.

The optical section 10 converts a laser light source 12 composed of, for example, a He-Cd laser, and a recording laser beam Lw emitted from the laser light source 12 into an ultrasonic signal from a modulating ultrasonic wave generating circuit 33A described later. An acousto-optic effect type optical modulator (hereinafter, simply referred to as AOM) 13A that is modulated (on / off) based on the laser beam Lw modulated by the AOM 13A is output from a deflection ultrasonic wave generator 33B described later. An acousto-optical effect type optical deflector (hereinafter, simply referred to as AOD) 13B that deflects based on the ultrasonic signal of
It is composed of a prism 14 that bends the optical axis of the laser beam Lw that has passed through the AOD 13B, and an objective lens 15 that collects the laser beam Lw that is reflected by the prism 14 and irradiates it on the photoresist surface of the glass substrate 11. ing.

The drive unit 20 includes a motor 21 for rotating the glass substrate 11, an FG generation circuit 22 for generating an FG pulse for detecting the rotation speed of the motor 21, and a slide of the glass substrate 11 in the radial direction. The slide motor 23 for controlling the rotation speed of the motor 21 and the slide motor 23, and the objective lens 15 in the optical unit 10.
And a servo controller 24 for controlling tracking and the like.

The signal processing unit 30 adds the error correction code or the like to the source data from the computer to generate the input data, for example.
And a logical operation circuit 32 for generating recording data by performing a predetermined logical operation on the input data from the formatting circuit 31, and modulating the power of the generated ultrasonic signal based on the recording data from the logical operation circuit 32. The ultrasonic wave generating circuit 33A for modulation, which is then output, and the synthetic circuit 3 which synthesizes and outputs the fine deflection signal generated based on the recording data and the sweep signal from the system controller 35 described later.
6 and the frequency of the generated ultrasonic wave signal,
Deflection ultrasonic wave generator 33B that modulates and outputs the modulated signal based on the combined signal from the above, a clock generator 34 that supplies a clock signal to the logical operation circuit 32 and the like, and a servo controller 24 and the like based on the supplied clock signal. And a system controller 35 for controlling the.

The system controller 35 outputs the phase difference signal between the FG pulse from the FG generating circuit 22 and the clock signal from the clock generator 34 to the servo controller 2.
Supply to 4. The servo controller 24 generates a rotation servo signal based on the phase difference signal from the system controller 35, supplies the rotation servo signal to the motor 21, and controls the rotation speed of the motor 21 to be constant.

At the same time, the servo controller 24
Based on the phase difference signal from the system controller 35, as shown in FIG.
When the constant speed is rotated (that is, at the start of the constant speed rotation), the elapsed time is taken (the numbers on the horizontal axis indicate the number of rotations of the glass substrate 11) and the vertical axis is the track pitch number, While the glass substrate 11 makes one rotation, the objective lens 15 sends a drive signal for linearly moving toward the inner circumference of the glass substrate 11 by one track pitch (0.8 μm in this example). The drive signal is generated and supplied to the slide motor 23 to control the movement of the glass substrate 11 so that the objective lens 15 relatively moves by one track pitch each time the glass substrate 11 makes one rotation.

Further, the system controller 35 uses the clock signal from the clock generator 34 and the FG generation circuit 22.
A sweep signal for supplying to the AOD 13B is generated based on the FG pulse from. This sweep signal is AOD1
8B by the deflection action on the recording laser beam Lw caused by the supply of the sweep signal to 3B.
As shown in (b), when the elapsed time from the start of the constant speed rotation of the glass substrate 11 is plotted on the horizontal axis and the track pitch number is plotted on the vertical axis, the recording substrate is recorded for one rotation. The spot position of the laser beam Lw is set to the glass substrate 11
1 track pitch toward the inner circumference of (in this example,
0.8 μm), and has a sawtooth-like signal waveform that linearly moves relative to each other and further retraces the recording laser beam Lw by one track pitch each time the glass substrate 11 makes one rotation.

The operation mode of the formatting circuit 31 is controlled by the system controller 35, and the generated input data is supplied to the logical operation circuit 32 together with the operation mode data for each track in synchronization with the rotation of the motor 21. In the first recording mode, one track of the generated input data is repeatedly supplied twice, and in the second and third recording modes, one track of the generated input data is sequentially supplied.

The input data of the first to third recording modes generated by the formatting circuit 31 is
It is supplied to the logical operation circuit 32 and is logically converted as recording data.

In the first recording mode in which the input data for one track is repeatedly supplied twice, the logical operation circuit 32 takes a positive logic which is a positive logic for the input data for one track at the first time. The recording data is generated, and the negative logic data obtained by performing the negative logic on the second input data for one track is the recording data (binary data of H and L).
To generate.

The logical operation circuit 32 has a built-in memory having a storage capacity capable of storing at least one track of recording data. In the second recording mode, recording is performed on the preceding track of the glass substrate 11. The stored data is stored in the memory, and the stored recording data and the input data relating to the next track input from the formatting circuit 31 are subjected to a predetermined logical operation, for example, an exclusive OR operation processing, The recording data (binary data of H and L) to be recorded on the track is generated.

Further, the logical operation circuit 32 is arranged so that the data (A, B,
(4 value data of C and M) is stored, and a predetermined logical operation, for example, exclusive OR operation processing is performed on the stored recording data and the input data regarding the next track input from the formatting circuit 31. Recording data (four-valued data of A, B, C, M) to be recorded on the next track is generated.

Then, the recorded data is supplied to the modulating ultrasonic wave generator 33A and the synthesizing circuit 36, respectively. The modulation ultrasonic generator 33A modulates the power of the generated ultrasonic signal based on the recording data, and supplies the modulated ultrasonic signal to the AOM 13A, so that the recording laser beam from the laser light source 12 is emitted. The light intensity of Lw is controlled to be turned on at the bit timing when the recording data is H, A, B, or C, and off at the bit timing when the recording data is L or M.

The synthesizing circuit 36 outputs the sweep signal from the system controller 35 to the deflection ultrasonic wave generator 33B in the first and second recording modes, and the supplied recording data in the third recording mode. Among them, the amplitude is + α, for example, at the bit timing when the recording data is B.
The amplitude is -α at the bit timing when the recorded data is C.
A fine deflection signal is generated, and the fine deflection signal and the sweep signal from the system controller 35 are combined (superposed) and output as a combined signal to the deflection ultrasonic wave generator 33B.

The deflecting ultrasonic wave generator 33B modulates the frequency of the generated ultrasonic wave signal based on the level of the combined signal from the combining circuit 36, and the modulated ultrasonic wave signal is AO.
The recording laser beam Lw whose intensity is modulated by the AOM 13A is supplied to the glass substrate 11 by being supplied to the D13B.
Is rotated by one track pitch toward the inner peripheral side of the glass substrate 11 during one rotation, and in addition, in the third recording mode, the deflection direction of the recording laser beam Lw is set to the recording data B or C. Drive control is performed in the + α direction or −α direction at the determined bit timing.

As a result, in this laser cutting device, the spot position of the recording laser beam Lw changes every time the glass substrate 11 makes one rotation by the movement operation of the glass substrate 11 by the slide motor 23.
It is displaced by one track pitch in the radial direction of the glass substrate 11, and at the same time, the recording laser beam L by the AOD 13B.
By the deflection operation of w, the recording laser beam Lw
Is swept by one track pitch in the radial direction of the glass substrate 11, so that as shown in FIG.
In the deflection period Ta of B with respect to the recording laser beam Lw, the spot position of the recording laser beam Lw jumps by two track pitches every time the glass substrate 11 makes one rotation.

That is, as shown in FIG. 9, the glass substrate 11
, The pitch T is equal to 2 track pitch
The recording laser beam Lw is irradiated along the spiral trajectory of the turn, and a resist latent image of pits based on the recording data is formed on the photoresist surface along the spiral trajectory. Then, during the blanking period Tb of the AOD 13B thereafter, the recording laser beam L
The spot position of w is returned by one track pitch in the outer peripheral direction.

More specifically, the glass substrate 11 is 1
In the rotating process, first, the recording laser beam Lw
At the time point when the pit information of the first track is recorded and the glass substrate 11 makes one rotation, the irradiation position of the recording laser beam Lw is located at the starting point of the third track, and by the subsequent blanking deflection, It is displaced to the outer peripheral side by one track pitch (that is, a track jump) and is positioned at the starting point of the second track.

Further, when the glass substrate 11 makes one rotation, the irradiation position of the recording laser beam Lw is located at the starting point of the fourth track, and is displaced to the outer peripheral side by one track pitch due to the subsequent blanking deflection ( That is, track jump)
However, it is located at the starting point of the third track. Similarly, every time the glass substrate 11 is rotated n times, the irradiation position of the recording laser beam Lw is located at the starting point of the (n + 2) th track, and is displaced to the outer peripheral side by one track pitch due to the subsequent blanking deflection. (That is, the track jump), and the track is positioned at the starting point of the (n + 1) th track.

In the laser cutting apparatus having such a configuration, the operation mode is switched by the system controller 35, so that one of the first to third recording modes can be designated to perform the laser cutting process. it can.

That is, in the first recording mode, the logical operation circuit 32 generates the pit data of the positive logic data and the pit data of the negative logic data with respect to the input data, and responds to the pit data of the positive logic data. Recording data is expressed by a pit string consisting of pits and a mirror surface, and an inverted pit string consisting of pits and a mirror surface corresponding to the pit data based on the negative logic data, and the spot size of the light beam for reproduction on the recording surface of the optical disk is expressed. A laser cutting process is performed to sequentially record the recording data on a track having a track pitch.

In the second recording mode, pit data is generated by the logical operation circuit 32 by a predetermined logical operation between the data recorded on the previous track and the input data, and the pit data is generated according to the pit data. The recording data is expressed by a pit row composed of pits and mirror surfaces, and laser cutting processing is performed to sequentially record the recording data on a track having a track pitch of ½ of the spot size of the reproduction light beam.

Further, in the third recording mode, the record data obtained by a predetermined logical operation between the data recorded on the previous track by the logical operation circuit 32 and the input data is used as wobble pit data and non-wobble pit data. The recording data is expressed by the wobble pits corresponding to the wobble pit data located at a position deviated from the mirror portion and the track center and the non-wobble pits corresponding to the non-wobble pit data located on the track center, and the reproduction is performed. Of the spot size of the light beam for
A laser cutting process for sequentially recording the recording data on a track having a track pitch of / 2 is performed.

Thus, the first recording mode and the second recording mode
Data recording with different recording densities in the recording mode and the third recording mode can be performed on the optical disc.

That is, after completion of the laser cutting process by the above laser cutting device, a developing process, an electroforming process and the like are performed to produce a stamper, and a large number of optical discs can be reproduced by using the produced stamper. .

The above-mentioned first
It is also possible to perform data recording in one of the recording modes, the second recording mode and the third recording mode, or by performing data recording in a plurality of recording modes, a plurality of recording densities having different recording densities can be obtained. A data recording area can also be formed.

As described above, according to the optical disk data recording method (cutting method by the above laser cutting device) of the present invention, an optical disk having a track pitch of ½ of the spot diameter on the recording surface of the reproducing laser beam. When making a master disk (stamper) of
One beam L is applied to the glass substrate 11 coated with the photoresist, which is a base for manufacturing the stamper.
With w, it is possible to form pit information (resist latent image) in the above-described first to third recording modes along a spiral locus with n sets as one set.

In the laser cutting apparatus according to this embodiment, in the above-mentioned second or third recording mode, for example, the track pitches Tp ₂ and Tp ₃ are 1/3 of the spot diameter of the reproducing laser beam. Even when an optical disc or an optical disc having a track pitch of ¼ of the above spot diameter is manufactured, pit information can be formed by one recording laser beam Lw, and a plurality of recording laser beams are emitted simultaneously. Therefore, it is not necessary to form pit information. Therefore, it is not necessary to use a special optical system including a laser light source for emitting a plurality of recording laser beams at the same time, and moreover, it is possible to control and position the irradiation positions of the plurality of recording laser beams according to the track pitch. There is no need to do it.

Further, in this laser cutting apparatus, since only one recording laser beam Lw is required, it is not necessary to irradiate a plurality of laser beams at one time in a spatially very narrow range. as a result,
Deterioration of the photosensitive state of the photoresist (for example, deterioration of the shape of the resist latent image) caused by simultaneous irradiation with a plurality of laser beams is not caused, and it is not necessary to manage jitter for each laser beam.

In addition, another adverse effect of simultaneously emitting a plurality of laser beams, that is, a plurality of laser light sources and optical modulators corresponding to the number of laser light sources are required, and the total number of parts increases.
There is no problem that the cost for laser cutting becomes high.

Next, as an embodiment of a data reproducing apparatus for an optical recording medium according to the present invention, a disk reproducing apparatus for reproducing data from an optical disk recorded with data in the first to third recording modes will be described with reference to FIGS. It will be described with reference to FIG.

In the data reproducing apparatus for the optical recording medium according to the present invention, the spot diameter equal to the track pitch Tp ₁ of the track on which the data is recorded in the first recording mode, that is, the second recording mode or the third recording mode. Track pitches Tp ₂ and Tp ₃ of tracks on which data is recorded in the mode
The reproduction laser beam having a spot diameter n times as large as that of FIG.

The disc reproducing apparatus of this embodiment has a structure as shown in FIG. 10, for example. This reproducing apparatus irradiates the optical disc 50 with a laser beam L and detects the light amount of the reflected light Lr reflected on the recording surface 50a, and a signal processing for reproducing data from a reproduced signal from the optical pickup 60. And a section 70.

The optical pickup 60 includes a laser light source 61.
A collimator lens 62 for collimating the emitted light (reproducing laser beam) L from the laser light source 61; A beam splitter 64 disposed in the optical path between the lens 63, the collimator lens 62 and the objective lens 63, and separating the reflected light Lr reflected by the recording surface 50a of the optical disc 50.
And the reflected light Lr separated by the beam splitter 64
A photoelectric conversion element (hereinafter, referred to as a photodetector) 65 for detecting the amount of light, a beam splitter 64, and a collection unit that collects the reflected light Lr separated by the beam splitter 64 in the optical path between the photodetectors 65. And an optical lens 66.

The optical pickup 60 includes a laser light source 6
The beam spot BS of the reproducing laser beam L emitted from the beam No. 1 scans the track center Tc of the track on which data is recorded in the first recording mode, and data is recorded in the second or third recording mode. The tracking servo control is performed so that adjacent tracks #n and # n + 1 are simultaneously scanned. The width scanned by the beam spot BS is called the scanning track width.

The laser light source 61 of the optical pickup 60 is
For example, it is composed of a semiconductor laser and emits a reproducing laser beam L having the same wavelength as that of a conventional optical pickup. The collimator lens 62 makes the reproduction laser beam L from the laser light source 61 incident on the beam splitter 64 as parallel light.

The beam splitter 64 is composed of, for example, a half mirror, and allows the reproducing laser beam L from the laser light source 61 to pass through the objective lens 63. Objective lens 6
Reference numeral 3 has an aperture ratio NA equivalent to that of a conventional optical pickup, collects the reproduction laser beam L from the laser light source 61 that has passed through the beam splitter 64, and the optical disc 50.
The recording surface 50a is irradiated.

The condenser lens 66 is composed of a cylindrical lens for obtaining a focus error signal by the astigmatism method, for example, and the reflected light Lr is reflected by the photodetector 65.
Focus on the light receiving surface of.

As shown in FIG. 11, the photodetector 65 has four light receiving regions 65a, 65b, 65.
It is divided into c and 65d. This photo detector 6
Reference numeral 5 designates the above-mentioned four regions 65a, 65 constituting the light receiving surface.
In b, 65c and 65d, in two areas 65a and 65d,
With reference to the spot scanning center on the recording surface 50a of the optical disc 50, for example, the reflected light Lr diffracted by the pit P on the outer peripheral side is incident, and the other two areas 65b and 65c are the spot scanning center on the recording surface 50a of the optical disc 50. Is set as a reference, and the reflected light Lr diffracted in the pit P on the inner peripheral side is incident on each of the areas 65a,
Reflected light Lr photoelectrically converted by 65b, 65c, and 65d
The detection signals S _A , S _B , S _C and S _D based on the light amount of are output from the respective output terminals.

On the other hand, the signal processing section 70 has four detection signals SA, SB, SC and S from the photodetector 65.
Amplifies D, and the amplified four detection signals SA,
An arithmetic circuit 71 that generates an RF signal and a push-pull signal from S _B , S _C , and S _D , and 16-value data reproduction is performed based on the RF signal and the push-pull signal from this arithmetic circuit 67 to obtain reproduction data. It has a signal discrimination circuit 72 for outputting.

[0139] Further, the arithmetic circuit 71, four detection signals SA from the photodetector _{65, S B, S C,} S D
For example, the astigmatism information is calculated from this and is output as a focus error signal, and at the same time, the four detection signals S _A , S
A tracking error signal of the sampled servo system, which will be described later, is extracted from _B , S _C , and S _D and output. The focus error signal and the tracking error signal are supplied to the servo controller 74.

Further, R generated by the arithmetic circuit 71 is
The F signal is also supplied to the PLL circuit 73. This PLL
The circuit 73 is a circuit that generates a clock signal from the RF signal from the arithmetic circuit 71, and the clock signal generated by the PLL circuit 73 is supplied to the system controller 75. The system controller 75 is the PLL
Based on the clock signal from the circuit 73, operation control of a servo controller 74, the signal discriminating circuit 72, etc. described later is performed.

The servo controller 74 sets the objective lens 63 in the optical pickup 60 in the tracking direction based on the focus error signal and the tracking error signal from the arithmetic circuit 71, the track jump from the system controller 75, the spindle rotation command information, and the like. A biaxial mechanism that holds the optical pickup 60 so that it can be driven in the focus direction and a sled mechanism that moves the optical pickup 60 in the radial direction of the optical disk are driven.
6 is rotationally driven by, for example, the CAV method.

Now, the essential parts for extracting the 16-value data and the tracking error signal, that is, the configurations of the arithmetic circuit 71 and the signal discriminating circuit 72 will be described with reference to FIG.

The arithmetic circuit 71 includes four regions 65a, 65b, 65c, which form the light receiving surface of the photodetector 65.
Detection signal S from two areas 65a and 65d in 65d
The first addition signal I _{1 is obtained} by taking the sum of the signal levels of _A and S _D.
And the other area 65
The first addition from the second adder 71b, which sums the respective signal levels of the detection signals S _B and S _C from b and 65c, and outputs as the second addition signal I ₂ , and the first addition from the first adder 71a. The third adder 71c, which sums the signal levels of the signal I ₁ and the second added signal I ₂ from the second adder 71b, and outputs the sum as the RF signal S _RF , and the first and second Addition signal I
_1, taking the difference of the signal levels of the I _2, and a subtracter 71d for outputting as a push-pull signal Spp.

Therefore, the two detection signals S _A and S _D from one of the regions 65a and 65d of the photodetector 65 are
The two detection signals S _B and S _C from the other regions 65b and 65c of the photodetector 65 are added by the first adder 71a and output as the _first addition signal I ₁ .
It is added by the second adder 71b and output as the _second addition signal I ₂ . These first and second addition signals I ₁ ,
I ₂ is added to each other by the third adder 71c to obtain R
The signal is output as the F signal S _RF , and is subtracted from each other by the subtractor 71d and output as the push-pull signal Spp.

The arithmetic circuit 71 also includes a first sample and hold circuit (hereinafter, simply referred to as S / H circuit) 71e for sampling and holding the RF signal S _RF from the third adder 71c at a predetermined timing. , A tracking error signal generation circuit 71f that generates a tracking error signal based on the sample hold signal from the first S / H circuit 71e, and an RF signal S _RF from the third adder 71c.
Has a second S / H circuit 71g for sampling and holding at a predetermined timing and outputting it as a clock generation signal.

The tracking error signal generation circuit 71
f is R according to the reproduction timing of the servo mark described later.
A tracking error signal is generated from the F signal.

On the other hand, the signal discriminating circuit 72 digitally converts the RF signal S _RF and the push-pull signal Spp from the arithmetic circuit 71 and outputs them as RF signal data and push-pull signal data, respectively. / D
The converters 72a and 72b and the first and second A / Ds
It has a 16-value conversion circuit 72c for discriminating the 16 values (patterns P _{1 to} P ₁₆ ) described above by a matrix operation of the values of the RF signal data supplied from the converters 72a and 72b and the values of the push-pull signal data.

A data extraction method by the arithmetic circuit 71 and the signal discriminating circuit 72 having such a configuration will be described below.

First, as the premise, as shown in FIG. 12, as the data recorded in the above-mentioned third recording mode, the mirror surface M ₁ and Pits A ₁ , B ₁ , C ₁
And the mirror surface M ₂ and the pits A ₂ , B ₂ and C ₂ are present on the track # n + 1.

One area 65 of the photo detector 65
a, 65d, that is, the signal level of the first addition signal I ₁ from the first adder 71a in the arithmetic circuit 71 and the diffraction levels obtained by the other regions 65b, 65c of the photodetector 65, that is, The signal levels of the second addition signal I ₂ from the second adder 71b in the arithmetic circuit 71 correspond to 0, α, 2α and 3α, respectively, as shown in FIG.

The signal levels (diffraction levels) of the first addition signal I ₁ and the second addition signal I ₂ are set to patterns P _{1 to} P.
Each of ₁₆ is shown in FIG. 4 (c).
Since the RF signal S _RF is obtained by the sum of the signal levels of the first and second addition signals I ₁ and I ₂ , the signal level (diffraction level) as the RF signal S _RF is obtained.
4 has a level distribution of 0 to -6 according to the patterns P _{1 to} P ₁₆ , as shown in FIG. 4D, while the first and second addition signals I ₁ and I ₂ level of the signal level of the push-pull signal Spp obtained by the difference of each other for each signal level (diffraction level), as shown in FIG. 4 (e), until -3 + 3 in accordance with the pattern P ₁ to P ₁₆ Will show the distribution.

This is shown in FIG. 13A for the RF signal S _RF (degree of modulation) and the push-pull signal Spp.
It is (b). In addition, in this FIG. 13 (a), (b),
A value calculated as a mirror level is 0.0 on the vertical axis. The beam position on the horizontal axis indicates the position where the beam spot BS has moved in the reproduction scanning direction with the pit center at 0.0 as shown in FIG.

Therefore, by extracting the data with the reproduction clock corresponding to the beam position 0.0, the information is extracted in the level range from 0 to -0.65 as the RF signal S _RF , and the push-pull is performed. Signal Sp
Information is extracted in the level range of about -0.3 to +0.3 as p.

As described above, both the RF signal S _RF and the push-pull signal Spp can be level-determined in seven types of divisions, and each of the patterns P _{1 to} P ₁₆ is shown in FIG.
As shown in 5, RF signal SRF and push-pull signal Sp
Since it is located independently on the information map corresponding to the level division of p, this information map is used as the hexadecimalization circuit 7
2c is logically stored in a predetermined array variable area of the memory incorporated in the memory 2c, and further, based on the values of the RF signal data and the push-pull signal data, the patterns P _{1 to} P are referred to by referring to this information map. By registering the algorithm for discriminating ₁₆ as a program, the current rescan from the value of the RF signal data and the value of the push-pull signal is
It is possible to easily determine which _{one of the} patterns P _{1 to} P ₁₆ .

For example, the value of the RF signal data is -0.2.
(That is, 2 in the information map) and the push-pull signal data value is 0.0 (0 in the information map), the hexadecimalization circuit 72c discriminates the pattern P _7, and the track #n is + α. The information B of the wobbled pit P and the track # n + 1 are reproduced as the information C of the wobbled pit P of −α.

Here, R generated by the arithmetic circuit 71
The signal waveforms of the F signal S _RF and the push-pull signal Dpp created by the digital equalizer 26 are shown in FIG.
(C), FIG.2 (b), (c) and FIG.4 (d), (e) are shown. In this example, the push-pull signal Dpp is
Although it is created as a digital signal, it is described as an analog waveform in order to facilitate waveform comparison with the analog RF signal S _RF .

First, the push-pull signal waveform and the RF signal waveform shown in FIGS. 2B and 2C reproduce the pit row and the inverted pit row of the recording data section Zw in the data area Zd shown in FIG. 2A. It is a waveform. From this figure, in the recorded data portion Zw, when the pit P is on the inner peripheral side with respect to the track center Tc as a reference, the mirror surface M is always present on the outer peripheral side, and conversely the inner peripheral side is the mirror surface M. In this case, since the pit P exists on the outer peripheral side, the signal level of the PF signal S _RF becomes the middle level (M).

On the other hand, the push-pull signal Dpp corresponds to the mirror surface M and the pit P in the pit row (or the inverted pit row).
When it becomes zero at the boundary with and there is a pit P on the inner circumference side,
In the case where there is a pit P on the outer peripheral side, which swings in the (-) direction,
The signal waveform swings in the (+) direction.

Next, the push-pull signal waveform and the RF signal waveform shown in FIGS. 1B and 1C are, as shown in FIG. 1A, the pit row and the inverted pit row around the servo area Zs. Is a reproduced waveform, particularly, a reproduced waveform when the beam spot BS scans the third track T ₃ . From this figure, the mirror portion Zm is composed of only the mirror surface M, and since there is no pit P on the inner and outer peripheral sides of the track center Tc as a reference, the RF signal S _RF corresponding to this mirror portion Zm. Signal level becomes high level (H).

Further, the servo mark Ms of the servo section Zss
Since the pit P exists on either the inner peripheral side or the outer peripheral side in the portion corresponding to, the servo mark M
The signal level of the RF signal S _RF corresponding to s becomes a medium level (M). Further, in the portion corresponding to the clock mark Mc of the servo section Zss, pits P exist on both the inner circumference side and the outer circumference side.
The signal level of the RF signal S _RF corresponding to is low level (L)
Becomes

On the other hand, when the push-pull signal Dpp becomes zero in the portion corresponding to the mirror portion Zm and the clock mark Mc, and the pit P is on the inner peripheral side in the portion corresponding to the servo mark Ms in the servo portion Zss, When there is a pit P in the (−) direction and there is a pit P on the outer peripheral side, the signal waveform has a sway in the (+) direction.

Table 3 shown below is a matrix for reproducing the data recorded on the optical disc 50.

[0163]

[Table 3]

In Table 1 above, the push-pull signal Dp is added to the row.
The polarity of p and the signal level of the RF signal D _RF are taken in the columns. In Table 1, when the RF signal D _RF has a high level value (H), as described above, the pit P does not exist in the beam spot BS and the push-pull signal Dpp cannot be obtained. The state in which the pull signal Dpp is “+” or “−” cannot be taken. Therefore, the RF signal D _RF
Has a high level value (H) and the polarity of the push-pull signal Dpp is "+" or "-" cannot exist.

When the RF signal D _RF has a medium level value (M), there is only one pit P in the beam spot BS, or in the pit row on the inner circumference side or the inverted pit row on the outer circumference side. This is a state in which there is a boundary between the pit P and the mirror surface M. In the former case, the push-pull signal Dpp is "+" or "-", and in the latter case, the push-pull signal Dpp is 0. Take a state.

Further, when the RF signal D _RF has a low level value (L), as described above, 2 in the beam spot BS.
Since there are two pits P and the push-pull signal Dpp cannot be obtained, the state in which the push-pull signal Dpp is “+” or “−” cannot be taken. Therefore, R
F signal D _RF is low level value (L) and push-pull signal D
A state in which the polarity of pp is “+” or “−” cannot exist.

Then, an information map as shown in FIG.
Stored in the memory built into the 16-value conversion circuit
As described above, the value of the RF signal data and the
Pattern P from the value of shuffle signal data₁~ P₁₆Format
Different is possible, but for this, as shown in FIG.
In addition, the value of the RF signal data is sorted into 0 to 6 levels.
Threshold value SL_R1~ SL_R6Will be required
In addition, the value of the push-pull signal data is set to the level of -3 to +3.
Threshold value SL for sorting into_P1~ SL _P6Is required
It will be important.

If the reflectance is always constant for each optical disk 50, and if no intersymbol interference is recognized on the optical disk 50, the threshold values SL _{R1 to} SL
_{Although R6} and the threshold values SL _{P1 to} SL _P6 can be set in advance based on experimental data or the like, in reality, due to intersymbol interference or the like, RF based on information of A, B, C, M
The value of the signal data and the value of the push-pull signal data may change.

Therefore, the 16 patterns of information shown in FIG. 4A are recorded as reference information in advance in a predetermined area (for example, the servo section Zs) of a predetermined cycle on the optical disc 50, and at the time of reproduction, RF obtained when each pattern in this reference information is reproduced
From the value of signal data and the value of push-pull signal data,
The optimum threshold values SLR1 to SLR6 and the threshold values SLP1 to SLP6 are calculated and stored in the memory incorporated in the hexadecimalization circuit 72c. This enables accurate 16-value discrimination.

Further, by recording this reference information in the servo section Zs of the so-called sample servo system (the head area of each segment in the sector dividing the track), tracking servo information can be obtained.

In this example, the beam spot BS is
Tracking is controlled at the middle position of the pair of tracks
At this time, the putter in FIG.
P ₁, Pattern P_FourAnd pattern P₁₃(All A information
The playback timing of the non-wobbled pit 11) becomes
The sampled RF signal S_RFDepending on the value of
Re-phase tracking control becomes possible.

The three-phase tracking control will be described below with reference to FIGS.

When the RF signal S _RF is extracted by the reproduction scanning by the configuration of the arithmetic circuit 71 and the signal discriminating circuit 72 shown in FIG. 11 described above, the RF signal S _RF becomes the first S signal.
It is also supplied to the / H circuit 71e and the second S / H circuit 71g. In the second S / H circuit 71g, for example, the RF signal S is reproduced at the reproduction timing of the area A in the servo section Zs of FIG.
RF is sampled and is supplied to the PLL circuit 73 (see FIG. 10) as a clock generation signal.

On the other hand, based on the clock signal generated by the PLL circuit 73, sampling clocks at the timings of the areas A, B and C are generated and supplied to the first S / H circuit 71e. The first S / H circuit 71e is
The RF signal S based on the supplied sampling clock
Three-phase signals RFA, RFB, and RFC obtained by sampling _RF and having different phases as shown in FIG.
Is supplied to the tracking error signal generation circuit 71f.

Tracking error signal generation circuit 71f
Is, for example, as shown in FIG.
differential amplifiers 80a, 80b, 80c for obtaining the difference between RF signals RFA, RFB, RFC from e, a multiplexer 81 for switching and selecting each output of these differential amplifiers 80a, 80b, 80c, and a differential amplifier 80a. , 8
Comparator 8 for detecting the polarity of each output of 0b and 80c
2a, 82b, 82c and these comparators 82a,
The logical operation circuit 83 controls the multiplexer 81 by a predetermined logical operation for each output of 82b and 82c.

The differential amplifier 80a is, for example, as shown in FIG.
As shown by a broken line in 7 (b), the tracking error signal T is obtained by subtracting the RF signal RFB from the RF signal RFC.
RA is generated, and the differential amplifier 80b subtracts the RF signal RFC from the RF signal RFA to obtain the tracking error signal T.
The RB is generated, and the differential amplifier 80c subtracts the RF signal RFA from the RF signal RFB to obtain the tracking error signal T.
Generate RC.

Therefore, these tracking error signals TRA, TRB, and TRC are sine waves, and the phases thereof are different from each other by 120 °, and the RF signals RFA and RF.
The signal has a phase advanced by 90 ° with respect to B and RFC. Each tracking error signal TRA, TRB, TR
C is a multiplexer 81 and comparators 82a and 8a
2b, 82c.

The comparators 82a, 82b and 82c are
For example, as shown in FIG. 17C, the polarities of the tracking error signals TRA, TRB, and TRC are detected,
For example, the polarity signals PA and P which are logic "1" at a positive level
B and PC are generated and these are supplied to the logical operation circuit 83. The logical operation circuit 83 is based on the equations (1) to (3) shown below, and as shown in FIG.
Control signals CA, CB, CC whose phases are different from each other by 120 °
To calculate.

When the control signal CA is logic "1", the tracking error signal TRA is selected, and when the control signal CB is logic "1", the tracking error signal T is selected.
When RB is selected and the control signal CC is logic "1", the multiplexer 81 is controlled so that the tracking error signal TRC is selected.

Ca = Pc ∩ INV (Pb) ………… (1)

Cb = Pa ∩ INV (Pc) ………… (2)

Cc = Pb ∩ INV (Pa) ………… (3)

In these equations (1) to (3), the symbols “∩” and “INV ()” are the logical product,
Means negative logic.

As shown by the solid line in FIG. 17B, the multiplexer 81 outputs a tracking error signal in which the tracking error signals TRA, TRB and TRC of three phases having different phases are periodically switched. This tracking error signal is supplied to the optical pickup 2 shown in FIG. 10 after being subjected to phase compensation processing in the servo loop, and the two-axis mechanism causes the objective lens 23 to move the tracking error signal in the radial direction of the optical disc 50. It is moved so that the level becomes zero.

By such tracking servo control, reproduction scanning is performed with the intermediate position of the adjacent pair track as the tracking center, and as described above, 16-valued pattern information by the pair track is extracted. .

In the example described above, the wobbled pits having a deviation amount of ± α are set, but when the S / N is good, the wobbled pits of ± α are set. In addition to the above, wobbled pits with deviation amounts of ± β and ± γ may be set.

For example, in this case, as the pit information recorded on the track, in addition to the non-wobbled pits (the above information A), the wobbled pits of ± α (the above information B and C), and the mirror surface M, ± β wobbled pits (above information D and E) and ± γ wobbled pits (above information F, above)
It becomes the 8 value of G).

As a result, the number of adjacent pair tracks is 6
Since four patterns of data are recorded, 64-value data can be reproduced per 1-bit timing.
In this case, even if the pit length is 0.8 μm, it is possible to realize a high density substantially equivalent to 0.0125 μm / bit (32 times that of the current compact disc).

In this embodiment, the pattern is extracted by using two tracks as a pair. However, the track pitch and the spot are set so that three or more tracks are simultaneously irradiated by the reproducing laser beam spot. The size or the like may be set, and the recording data may be generated in each track by a logical operation of the input data and the recording data in the preceding two or more tracks.

[0190]

In the first recording mode of the data recording method for the optical recording medium according to the first aspect of the invention, the recording data is expressed by the positive logic data and the negative logic data, and the track is scanned by the reproduction light beam. With the center as a reference, the positive logic data is recorded as a pit row on one of the inner circumference side or the outer circumference side, and the negative logic data is recorded as an inverted pit row on the other of the inner circumference side or the outer circumference side. Even if there is logically continuous data of "1" or "0", good DC balance is achieved without performing modulation such as EFM that causes an increase in the data length, that is, D
The value of SV can be set to zero, and the servo control can be stabilized and the recording data density can be increased at the same time.

In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. The pit width, the pit length, and the spot size of the reproducing laser beam are recorded because the recording data is recorded on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. It is possible to record data at a recording density n times as high as that in the first recording mode without changing the value.

Therefore, according to the data recording method of the optical recording medium of the first invention, the recording surface of the optical recording medium is
Data recording having different recording densities can be performed in the first recording mode and the second recording mode. .

In the first recording mode of the data recording method for the optical recording medium according to the second aspect of the present invention, the recording data is represented by the positive logic data and the negative logic data, and is used for reproduction on the recording surface of the optical recording medium. On a track having a track pitch approximately equal to the spot size of the light beam, with the track center scanned by the reproduction light beam as a reference, the positive logic data as a pit row on one of the inner circumference side and the outer circumference side. Since the negative logic data is recorded as an inverted pit string on the other side of the inner circumference side or the outer circumference side while recording, even if there is logically continuous data of "1" or "0", data such as EFM data is recorded. It is possible to achieve good DC balance, that is, to bring the DSV value to zero, without performing modulation that causes an increase in length, and to stabilize servo control. It can increase the density of the fine recording data at the same time.

In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. A track having a track pitch of 1 / n of a spot size of a reproducing light beam on a recording surface of an optical recording medium, a mirror surface of the recording data, a wobble pit located at a position deviated from a track center, and a track. Since the data is recorded as a pit string consisting of non-wobble pits located on the center, data is recorded at a recording density higher than n times that of the first recording mode without changing the pit width, the pit length, and the spot size of the reproduction laser beam. Records can be made. In addition, since the DC component of the push-pull signal has a multi-valued level by recording the data in a multi-valued representation, it is possible to detect the data with a good S / N, and it is less likely to be affected by the reflectance fluctuation, for example. .

Therefore, according to the data recording method of the optical recording medium of the second invention, the recording surface of the optical recording medium is
Data recording having different recording densities can be performed in the first recording mode and the second recording mode. .

In the first recording mode of the data recording method for the optical recording medium according to the third aspect of the invention, the data recorded on the preceding (n-1) continuous tracks and the input data are predetermined. The data obtained by the logical operation is used as the recording data of the next track, and the recording data is recorded as a pit string on the track having the track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. Therefore, it is possible to record data at a recording density n times as high as that of an ordinary compact disc without changing the spot size as compared with an ordinary compact disc.

Further, in the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. A track having a track pitch of 1 / n of a spot size of a reproducing light beam on a recording surface of an optical recording medium, a mirror surface of the recording data, a wobble pit located at a position deviated from a track center, and a track. By recording the data in multi-valued representation as a pit string of non-wobble pits located on the center, the recording is higher than that of the second recording mode without changing the pit width, the pit length and the spot size of the reproduction laser beam. Data recording can be performed with density. In addition, since the DC component of the push-pull signal has a multi-valued level by recording the data in a multi-valued representation, it is possible to detect the data with a good S / N, and it is less likely to be affected by the reflectance fluctuation, for example. .

Therefore, according to the data recording method of the optical recording medium of the third invention, the recording surface of the optical recording medium is
Data recording having different recording densities can be performed in the first recording mode and the second recording mode. .

In the first recording mode of the data recording method for the optical recording medium according to the fourth aspect of the present invention, the recording data is expressed by the positive logic data and the negative logic data, and the track is scanned by the reproducing light beam. With the center as a reference, the positive logic data is recorded as a pit row on one of the inner circumference side or the outer circumference side, and the negative logic data is recorded as an inverted pit row on the other of the inner circumference side or the outer circumference side. Even if there is logically “1” or “0” continuous data, good DC balance is achieved, that is, DSV value is set to zero, without performing modulation that causes an increase in data length such as EFM. Thus, it is possible to stabilize the servo control and increase the recording data density at the same time.

In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. The pit width, the pit length, and the spot size of the reproducing laser beam are recorded because the recording data is recorded on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. It is possible to record data at a recording density n times as high as that in the first recording mode without changing the value.

Further, in the third recording mode, the data obtained by the predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data is set as the recording data of the next track. A track having a track pitch of 1 / n of a spot size of a reproducing light beam on a recording surface of an optical recording medium, a mirror surface of the recording data, a wobble pit located at a position deviated from a track center, and a track. By recording the data in multi-valued representation as a pit string of non-wobble pits located on the center, the recording is higher than that of the second recording mode without changing the pit width, the pit length and the spot size of the reproduction laser beam. Data recording can be performed with density. In addition, since the DC component of the push-pull signal has a multi-valued level by recording the data in a multi-valued representation, it is possible to detect the data with a good S / N, and it is less likely to be affected by the reflectance fluctuation, for example. .

Therefore, according to the data recording method of the optical recording medium of the fourth invention, the recording surface of the optical recording medium is
Data recording having different recording densities can be performed in the first recording mode, the second recording mode, and the third recording mode. .

In the first recording mode of the data recording apparatus for the optical recording medium according to the fifth aspect of the present invention, the recording data is expressed by the positive logic data and the negative logic data, and the center of the track scanned by the reproducing light beam is set. As a reference, the positive logic data is recorded as a pit row on one of the inner circumference side and the outer circumference side, and the negative logic data is recorded as an inverted pit row on the other inner circumference side or the outer circumference side. Even if there is continuous data of "1" or "0" in the DC, good DC balance can be achieved without performing modulation that causes an increase in the data length such as EFM.
The value of V can be reduced to zero, and the servo control can be stabilized and the recording data density can be increased at the same time.

In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. The pit width, the pit length, and the spot size of the reproducing laser beam are recorded because the recording data is recorded on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. It is possible to record data at a recording density n times as high as that in the first recording mode without changing the above.

Therefore, in the data recording apparatus for the optical recording medium according to the fifth aspect of the present invention, the control means switches the operation mode between the first recording mode and the second recording mode, and the recording surface of the optical recording medium is changed. Data recording with different recording densities in the first recording mode and the second recording mode can be performed.

In the first recording mode of the data recording device for an optical recording medium according to the sixth aspect of the present invention, the recording data is expressed by positive logic data and negative logic data, and is used for reproduction on the recording surface of the optical recording medium. On a track having a track pitch approximately equal to the spot size of the light beam, with the track center scanned by the reproduction light beam as a reference, the positive logic data as a pit row on one of the inner circumference side and the outer circumference side. Since the negative logic data is recorded as an inverted pit string on the other side of the inner circumference side or the outer circumference side while recording, even if there is logically continuous data of "1" or "0", data such as EFM data is recorded. It is possible to achieve good DC balance, that is, to bring the DSV value to zero, without performing modulation that causes an increase in length, and to stabilize servo control. It can increase the density of the fine recording data at the same time.

In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. A track having a track pitch of 1 / n of a spot size of a reproducing light beam on a recording surface of an optical recording medium, a mirror surface of the recording data, a wobble pit located at a position deviated from a track center, and a track. Since the data is recorded as a pit string consisting of non-wobble pits located on the center, data is recorded at a recording density higher than n times that of the first recording mode without changing the pit width, the pit length, and the spot size of the reproduction laser beam. Records can be made. In addition, since the DC component of the push-pull signal has a multi-valued level by recording the data in a multi-valued representation, it is possible to detect the data with a good S / N, and it is less likely to be affected by the reflectance fluctuation, for example. .

Therefore, in the optical recording medium data recording apparatus according to the sixth aspect of the present invention, the operation mode is switched between the first recording mode and the second recording mode by the control means, and the recording surface of the optical recording medium is changed. On the other hand, it is possible to perform data recording having different recording densities in the first recording mode and the second recording mode.

In the first recording mode of the data recording apparatus for an optical recording medium according to the seventh aspect of the present invention, the data recorded on the preceding (n-1) continuous tracks and the input data are predetermined. The data obtained by the logical operation is used as the recording data of the next track, and the recording data is recorded as a pit string on the track having the track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. Therefore, it is possible to record data at a recording density n times as high as that of an ordinary compact disc without changing the spot size as compared with an ordinary compact disc.

Further, in the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. A track having a track pitch of 1 / n of a spot size of a reproducing light beam on a recording surface of an optical recording medium, a mirror surface of the recording data, a wobble pit located at a position deviated from a track center, and a track. By recording the data in multi-valued representation as a pit string of non-wobble pits located on the center, the recording is higher than that of the second recording mode without changing the pit width, the pit length and the spot size of the reproduction laser beam. Data recording can be performed with density. In addition, since the DC component of the push-pull signal has a multi-valued level by recording the data in a multi-valued representation, it is possible to detect the data with a good S / N, and it is less likely to be affected by the reflectance fluctuation, for example. .

Therefore, in the data recording apparatus for an optical recording medium according to the seventh aspect of the invention, the control unit switches the operation mode between the first recording mode and the second recording mode, and the recording surface of the optical recording medium is recorded. On the other hand, it is possible to perform data recording having different recording densities in the first recording mode and the second recording mode.

In the first recording mode of the data recording apparatus for an optical recording medium according to the eighth aspect of the present invention, the recording data is expressed by positive logic data and negative logic data, and the track is scanned by the reproduction light beam. With the center as a reference, the positive logic data is recorded as a pit row on one of the inner circumference side or the outer circumference side, and the negative logic data is recorded as an inverted pit row on the other of the inner circumference side or the outer circumference side. Even if there is logically “1” or “0” continuous data, good DC balance is achieved, that is, DSV value is set to zero, without performing modulation that causes an increase in data length such as EFM. Thus, it is possible to stabilize the servo control and increase the recording data density at the same time.

In the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. The pit width, the pit length, and the spot size of the reproducing laser beam are recorded because the recording data is recorded on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. It is possible to record data at a recording density n times as high as that in the first recording mode without changing the value.

Further, in the third recording mode, the data obtained by a predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data of the next track. A track having a track pitch of 1 / n of a spot size of a reproducing light beam on a recording surface of an optical recording medium, a mirror surface of the recording data, a wobble pit located at a position deviated from a track center, and a track. By recording the data in multi-valued representation as a pit string of non-wobble pits located on the center, the recording is higher than that of the second recording mode without changing the pit width, the pit length and the spot size of the reproduction laser beam. Data recording can be performed with density. In addition, since the DC component of the push-pull signal has a multi-valued level by recording the data in a multi-valued representation, it is possible to detect the data with a good S / N, and it is less likely to be affected by the reflectance fluctuation, for example. .

Therefore, in the data device for the optical recording medium according to the eighth aspect of the invention, the control unit switches the operation mode to the first recording mode, the second recording mode and the third recording mode to perform the optical recording. Data recording having different recording densities can be performed on the recording surface of the medium in the first recording mode, the second recording mode, and the third recording mode.

In the first reproducing mode of the data reproducing apparatus for an optical recording medium according to the ninth invention, the recording data is expressed by positive logic data and negative logic data, and a reproducing light beam on the recording surface of the optical recording medium is used. On a track having a track pitch substantially equal to the spot size of the above, with the center of the track scanned by the reproduction light beam as a reference, a pit row consisting of a pit and a mirror surface on one of the inner peripheral side and the outer peripheral side. In the reproduction mode for the first recording mode, the positive logical data is recorded and the negative logical data is recorded on the other of the inner peripheral side and the outer peripheral side as the inverted pit train in which the pits in the pit train and the mirror surface are reversed. Therefore, in the first reproduction mode, the track on the recording surface of the optical recording medium on which the data is recorded in the first recording mode is The recording in the first recording mode is performed by the arithmetic processing means from the RF signal and the push-pull signal generated by scanning with the optical beam for reproduction by the optical pickup to perform the logical operation corresponding to the first recording mode. By reproducing the data, logically "1" or "0"
Even if there is continuous data, the DC balance can be made good, that is, the DSV value can be brought to zero without performing the modulation such as the EFM that causes the data length to increase, and the servo control can be stabilized. Therefore, it is possible to reliably reproduce the recording data in the first recording mode.

In the second reproduction mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. Reproduction for a second recording mode in which the above-mentioned record data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium. In this second reproduction mode, n tracks on the recording surface of the optical recording medium in which the data has been recorded in the second recording mode are scanned by the optical beam for reproduction by the optical pickup. From the RF signal and the push-pull signal generated by the above, the arithmetic processing means performs a logical operation corresponding to the second recording mode to obtain the second recording mode. By reproducing the recorded data from the optical recording medium, the second recording is performed at a recording density n times that of the first recording mode without shortening the wavelength of the laser light source or increasing the NA of the objective lens. The record data in the record mode can be reproduced from the optical recording medium.

Therefore, in the data reproducing apparatus for the optical recording medium according to the ninth invention, the operation mode is set to the first reproducing mode by the control means without shortening the wavelength of the laser light source or increasing the NA of the objective lens. It is possible to reproduce from the optical recording medium the recording data having different recording densities recorded in the first recording mode or the second recording mode by switching to the second reproduction mode.

In the first reproducing mode of the data reproducing apparatus for an optical recording medium according to the tenth aspect of the invention, the recording data is represented by positive logic data and negative logic data, and is used for reproduction on the recording surface of the optical recording medium. A pit row consisting of a pit and a mirror surface on one of the inner circumference side and the outer circumference side of a track having a track pitch substantially equal to the spot size of the light beam, with reference to the track center scanned by the reproducing light beam. And the positive logic data are recorded as the above, and the negative logic data is recorded as the inverted pit train in which the pits in the pit train and the mirror surface are reversed on the other side of the inner circumference side or the outer circumference side. A recording mode of the optical recording medium in which data is recorded in the first recording mode in the first reproducing mode. From the RF signal and the push-pull signal generated by scanning the track with the reproduction light beam by the optical pickup, the arithmetic processing means performs a logical operation corresponding to the first recording mode to obtain the first recording mode. By reproducing the recorded data, logically "1"
Or even if there is continuous data of "0", without performing modulation that causes an increase in data length such as EFM,
The DC balance can be made good, that is, the DSV value can be brought to zero, the servo control can be stabilized, and the record data in the first record mode can be reliably reproduced.

In the second reproduction mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. A mirror surface, a wobble pit located at a position deviated from the track center, and a position on the track center on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium. A reproduction mode for the second recording mode in which the recording data is expressed and recorded by the non-wobble pits. In the second reproduction mode, the optical recording medium in which the data is recorded in the second recording mode is recorded. From the RF signal and the push-pull signal generated by scanning the n tracks on the recording surface with the optical beam for reproduction by the optical pickup, The arithmetic processing means performs a logical operation corresponding to the second recording mode and reproduces the recording data of the second recording mode from the optical recording medium, thereby shortening the wavelength of the laser light source or the objective lens. NA
It is possible to reproduce from the optical recording medium the record data in the second recording mode, which is multi-valued and recorded at a recording density n times as high as that in the first recording mode, without increasing the value.

Therefore, in the data reproducing apparatus for the optical recording medium according to the tenth invention, the wavelength of the laser light source is shortened,
The operating mode is switched to the first reproduction mode and the second reproduction mode by the control means without increasing the NA of the objective lens, and different recording densities recorded in the first recording mode or the second recording mode are recorded. The recorded data of can be reproduced from the optical recording medium.

Further, in the first reproducing mode in the data reproducing apparatus for the optical recording medium according to the eleventh invention, the predetermined data of the data recorded on the previous (n-1) continuous tracks and the input data are set. The data obtained by the logical operation is used as the recording data of the next track, and the pit row consisting of the pits and the mirror surface is formed on the track having the track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. Is a reproduction mode for the first recording mode for recording the above-mentioned record data as a recording medium, and in the first reproduction mode, n recording data on the recording surface of the optical recording medium in which the data is recorded in the second recording mode are recorded. From the RF signal and push-pull signal generated by scanning the track with the reproduction light beam by the optical pickup, the first recording mode is calculated by the arithmetic processing means. By performing a logical operation corresponding to the first mode and reproducing the record data of the first record mode from the optical recording medium, the wavelength of the laser light source is not shortened, and the NA of the objective lens is not increased. The record data in the record mode can be reproduced from the optical recording medium.

In the second reproduction mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. A mirror surface, a wobble pit located at a position deviated from the track center, and a position on the track center on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium. A reproduction mode for the second recording mode in which the recording data is expressed and recorded by the non-wobble pits. In the second reproduction mode, the optical recording medium in which the data is recorded in the second recording mode is recorded. From the RF signal and the push-pull signal generated by scanning the n tracks on the recording surface with the optical beam for reproduction by the optical pickup, The arithmetic processing means performs a logical operation corresponding to the second recording mode and reproduces the recording data of the second recording mode from the optical recording medium, thereby shortening the wavelength of the laser light source or the objective lens. NA
It is possible to reproduce the multi-value recorded data in the second recording mode from the optical recording medium without increasing the value.

Therefore, in the data reproducing apparatus for the optical recording medium according to the eleventh invention, the wavelength of the laser light source is shortened,
The operating mode is switched to the first reproduction mode and the second reproduction mode by the control means without increasing the NA of the objective lens, and different recording densities recorded in the first recording mode or the second recording mode are recorded. The recorded data of can be reproduced from the optical recording medium.

Further, in the first reproducing mode of the data reproducing apparatus for the optical recording medium according to the twelfth invention, the recording data is expressed by the positive logic data and the negative logic data, and is used for reproducing on the recording surface of the optical recording medium. A pit row consisting of pits and a mirror surface on one of the inner circumference side and the outer circumference side of a track having a track pitch substantially equal to the spot size of the light beam, with the track center scanned by the reproduction light beam as a reference. Is recorded as the positive logic data and the negative logic data is recorded as an inverted pit train in which the pits in the pit train and the mirror surface are reversed on the other side of the inner circumference side or the outer circumference side. A recording surface of an optical recording medium in which data is recorded in the first recording mode in the first reproducing mode. From the RF signal and the push-pull signal generated by scanning the track (1) with the reproduction light beam by the optical pickup, the arithmetic processing means performs the logical operation corresponding to the first recording mode to perform the first recording mode. Even if there is logically "1" or "0" continuous data by reproducing the recorded data of EFM, the EFM
It is possible to achieve good DC balance, that is, to bring the value of DSV to zero, without performing modulation that causes an increase in the data length of the first recording mode. The recorded data can be reliably reproduced.

In the second reproduction mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. Reproduction for a second recording mode in which the above-mentioned record data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium. In this second reproduction mode, n tracks on the recording surface of the optical recording medium in which the data has been recorded in the second recording mode are scanned by the optical beam for reproduction by the optical pickup. From the RF signal and the push-pull signal generated by the above, the arithmetic processing means performs a logical operation corresponding to the second recording mode to obtain the second recording mode. By reproducing the recorded data from the optical recording medium, the second recording is performed at a recording density n times that of the first recording mode without shortening the wavelength of the laser light source or increasing the NA of the objective lens. The record data in the record mode can be reproduced from the optical recording medium.

In the third reproduction mode, the data obtained by a predetermined logical operation between the data recorded in the previous (n-1) continuous tracks and the input data is used as the recording data of the next track. , A mirror surface, a wobble pit located at a position deviated from the track center, and a position on the track center on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium. Is a reproduction mode for the third recording mode in which the recording data is expressed and recorded by the non-wobble pits. In the third reproduction mode, the optical recording medium in which the data is recorded in the third recording mode From the RF signal and the push-pull signal generated by scanning the n tracks on the recording surface with the optical beam for reproduction by the optical pickup, The arithmetic processing means performs a logical operation corresponding to the third recording mode and reproduces the recording data of the second recording mode from the optical recording medium, thereby shortening the wavelength of the laser light source or the objective lens. NA
It is possible to reproduce from the optical recording medium the record data in the third recording mode, which is multi-valued and recorded at a recording density n times as high as that of the first recording mode, without increasing the value.

Therefore, in the data reproducing apparatus for the optical recording medium according to the twelfth invention, the wavelength of the laser light source is shortened,
The operation mode is switched to the first reproduction mode, the second reproduction mode and the third reproduction mode by the control means without increasing the NA of the objective lens, and the first recording mode, the second recording mode or It is possible to reproduce the recording data having different recording densities recorded in the second recording mode from the optical recording medium.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of an optical disc recorded in a first recording mode, particularly a servo area and its periphery,
9A is a schematic diagram showing an example of a recording format in the servo area and its periphery, and FIG. 7B is a waveform diagram showing a push-pull signal waveform obtained by reproducing the servo area and its periphery. (C) is a waveform diagram showing an RF signal waveform obtained by reproducing the servo area and its periphery.

FIG. 2 is a diagram showing a main part of an optical disc recorded in the first recording mode, particularly a data part thereof, and FIG. 2 (a) is a schematic diagram showing an example of a recording format in a record data part of a data area; 6B is a waveform diagram showing a push-pull signal waveform obtained by reproducing the data portion, and FIG. 7C is a waveform diagram showing an RF signal waveform obtained by reproducing the data portion.

FIG. 3 is a diagram showing a main part of an optical disc recorded in a second recording mode, particularly a data part thereof.

FIG. 4 is a diagram showing a main part of an optical disc recorded in a third recording mode, particularly a data part thereof, FIG. 4A is a schematic diagram showing an example of a recording format in the data part, and FIG. Is a table showing the type of data to be recorded, (c) is a table showing the diffraction level of the recorded data, and (d) is an RF signal waveform obtained by reproducing the data section. The waveform diagram, (e) is a waveform diagram showing a push-pull signal waveform obtained by reproducing the data section.

FIG. 5 is a diagram showing a specific example of a main part of an optical disc recorded in the third recording mode, particularly a data part thereof, and FIG. 5 (a) is a schematic diagram showing an example of a recording format in the data part; FIG. 7B is a table showing the types of data to be recorded, and FIG. 8C is a table showing the data after the data to be recorded is converted into 16 levels.

FIG. 6 is a schematic diagram showing a recording format of a main part of an optical disc recorded in the third recording mode, particularly a servo part and its peripheral part.

FIG. 7 is a block diagram showing a configuration of a laser cutting device for realizing a data recording method for an optical recording medium according to the present invention.

FIG. 8 is a diagram showing an example of a displacement state of an irradiation position of a recording laser beam by a slide motor and an AOD of the laser cutting device. FIG. 8A shows a recording laser beam only by a moving operation by the slide motor. The displacement of the irradiation position is shown, (b) shows the displacement of the irradiation position of the recording laser beam only by the optical deflection of the AOD, and (c) shows the combination of the movement operation by the slide motor and the optical deflection by the AOD. The displacement of the irradiation position of the recording laser beam in the case is shown.

FIG. 9 is an explanatory diagram showing irradiation loci of a recording laser beam by a slide motor and an AOD of the laser cutting apparatus according to the present embodiment.

FIG. 10 is a block diagram showing a structure of a reproducing apparatus for reproducing data from the optical disc, in particular, a reproducing system thereof.

FIG. 11 is a block diagram showing a configuration of an arithmetic circuit and a signal discriminating circuit relating to signal processing of the reproduction system.

FIG. 12 is an explanatory diagram of diffraction levels of non-wobble pits, wobble pits, and mirror surfaces recorded on the optical disc.

FIG. 13 is a characteristic diagram showing a level change of an RF signal and a push-pull signal obtained by data reproduction in the reproduction system with respect to a change of a reproduction laser beam position, and FIG. 13A is a level of the RF signal. The change is shown in FIG. 9B, which shows the change in the level of the push-pull signal.

FIG. 14 is a diagram for explaining a change in a reproduction laser beam position.

FIG. 15 is an explanatory diagram showing an information map used for 16-value discrimination in the signal discrimination circuit in the reproduction system.

FIG. 16 is a circuit diagram showing a configuration of a tracking error signal generation circuit incorporated in the arithmetic circuit.

FIG. 17 is a timing chart showing a tracking error signal generation operation in the tracking error signal generation circuit.

FIG. 18 is a schematic diagram showing a recording format of a conventional optical disc.

[Explanation of symbols]

 P ... Pit BS ... Beam spot 10 ... Optical part 11 ... Glass substrate 12 ... Laser light source 13A ... AOM 13B ... AOD 14-Prism 15-Objective lens 20-Drive unit 21-Motor 22-FG generation circuit 23-Slide motor 24-・ ・ ・ Servo controller 30 ・ ・ ・ ・ ・ Signal processing unit 31 ・ ・ ・ Formatting circuit 32 ・ ・ ・ Logical operation circuit 33A ・ ・ ・ ・ Modulation ultrasonic wave generation circuit 33B ・ ・ ・ ・ For deflection Ultrasonic wave generation circuit 35 ... System controller 50 ... Optical disc 50a ... Recording surface 60 ... Optical pickup 61 ... Laser light source 62 ... Collimator lens 63 ... ..Objective lens 64..beam splitter 65..photodetector 66..condensing lens 70..signal processing circuit 71..computing circuit 72 .. -Signal discrimination circuit 73-PLL circuit 74-Servo controller 75-System controller 76-Spindle motor

Claims (12)

[Claims] 1. The recording data is represented by positive logic data and negative logic data, and the reproduction light is recorded on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. With the track center scanned by the beam as a reference, the positive logic data is recorded as a pit row consisting of pits and a mirror surface on one of the inner peripheral side or the outer peripheral side, and the above-mentioned on the other inner or outer peripheral side. A first recording mode in which the negative logic data is recorded as an inverted pit train in which the pits in the pit train and the mirror surface are reversed, and the data and the input data recorded in the preceding (n-1) continuous tracks. The data obtained by the predetermined logical operation of is the recording data of the next track, and the spot of the reproduction light beam on the recording surface of the optical recording medium Of size 1 / n
A second recording mode for recording the recording data as a pit row consisting of pits and a mirror surface on a track having a track pitch of, and recording an optical recording medium in the first recording mode or the second recording mode. A data recording method for an optical recording medium, characterized in that data is recorded on a recording surface. 2. The recording data is expressed by positive logic data and negative logic data, and the reproducing light beam is recorded on a track having a track pitch substantially equal to the spot size of the reproducing light beam on the recording surface of the optical recording medium. With the track center scanned by the beam as a reference, the positive logic data is recorded as a pit row composed of pits and a mirror surface on one of the inner peripheral side or the outer peripheral side, and the other on the inner peripheral side or the outer peripheral side. A first recording mode in which the negative logic data is recorded as an inverted pit train in which the pits in the pit train and the mirror surface are reversed, and the data and input data recorded in the preceding (n-1) continuous tracks. The data obtained by the predetermined logical operation of is the recording data of the next track, and the spot of the light beam for reproduction on the recording surface of the optical recording medium. Of size 1 / n
A second recording mode in which the recording data is expressed and recorded on a track having a track pitch of 2 by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. And a method for recording data on an optical recording medium, wherein the data is recorded on the recording surface of the optical recording medium in the first recording mode or the second recording mode. 3. The data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track,
A first recording mode for recording the above recording data as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of a spot size of a reproducing light beam on a recording surface of an optical recording medium; The data obtained by a predetermined logical operation of the data recorded on the (n-1) continuous tracks of (1) and the input data is used as the recording data of the next track, and the optical beam for reproduction on the recording surface of the optical recording medium is used. 1 / n of spot size
A second recording mode in which the recording data is expressed and recorded on a track having a track pitch of 2 by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. And a method for recording data on an optical recording medium, wherein the data is recorded on the recording surface of the optical recording medium in the first recording mode or the second recording mode. 4. The reproduction data is represented by positive logic data and negative logic data, and the reproduction light beam is recorded on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. With the track center scanned by the beam as a reference, the positive logic data is recorded as a pit row consisting of pits and a mirror surface on one of the inner peripheral side or the outer peripheral side, and the above-mentioned on the other inner or outer peripheral side. A first recording mode in which the negative logic data is recorded as an inverted pit train in which the pits in the pit train and the mirror surface are reversed, and the data and the input data recorded in the preceding (n-1) continuous tracks. The data obtained by the predetermined logical operation of is the recording data of the next track, and the spot of the light beam for reproduction on the recording surface of the optical recording medium. Of size 1 / n
The second recording mode in which the above-mentioned recording data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of, and the data and the input data recorded on the previous (n-1) continuous tracks The data obtained by a predetermined logical operation with is the recording data of the next track, and 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium
A third recording mode in which the recording data is expressed and recorded on a track having a track pitch of 3 by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. And a method for recording data on an optical recording medium in the first recording mode, the second recording mode, or the third recording mode. 5. In the first recording mode, the pit data and the inverted pit data in which the positive logic data and the negative logic data obtained by the logical operation of the positive logic and the negative logic of the input data are used as the recording data of the next track are generated. However, in the second recording mode, the pit data in which the data obtained by a predetermined logical operation between the data recorded in the previous (n-1) continuous tracks and the input data is the recording data of the next track is generated. An arithmetic processing unit for generating, a light source for emitting a light beam for data recording, an optical modulator for intensity-modulating the light beam from the light source according to pit data from the arithmetic processing unit, and the light from the light source. An objective lens that focuses the light beam incident through the modulator on the recording surface of the optical recording medium, and a beam spot of the light beam that passes through the objective lens The recording medium is provided with a moving unit that relatively moves in the radial direction and a control unit that switches the operation mode between the first recording mode and the second recording mode. In the first recording mode, reproduction on the recording surface of the optical recording medium is performed. On the track having a track pitch approximately equal to the spot size of the light beam for reproduction, a pit and a mirror surface are formed on one of the inner circumference side and the outer circumference side with reference to the track center scanned by the reproduction light beam. The positive logical data is recorded as a pit string, and the negative logical data is recorded on the other of the inner peripheral side or the outer peripheral side as an inverted pit string in which the pits in the pit array and the mirror surface are reversed, and the second recording is performed. In the mode, the data obtained by a predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data is It is assumed that recording data of a track is recorded on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium as a pit string including pits and a mirror surface. A data recording apparatus for a characteristic optical recording medium. 6. In the first recording mode, pit data and inverted pit data in which positive logic data and negative logic data obtained by a logical operation of positive logic and negative logic of input data are recorded data of the next track are generated. However, in the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is the wobble pit data for the recording data of the next track and An arithmetic processing means for generating non-wobble pit data, a light source for emitting a light beam for data recording, an optical modulator for intensity-modulating the light beam from the light source according to the pit data from the arithmetic processing means, An optical deflector for minutely deflecting the light beam from the light source according to the wobble pit data from the arithmetic processing means, and the light modulation from the light source. And an objective lens for converging the light beam incident through the optical deflector on the recording surface of the optical recording medium, and a beam spot of the light beam passing through the objective lens relatively moving in the radial direction of the optical recording medium. The moving means and the control means for switching the operation mode between the first recording mode and the second recording mode are provided. In the first recording mode, the spot size of the reproducing light beam on the recording surface of the optical recording medium is approximately the same. The positive logic data is recorded on tracks having the same track pitch as a pit row composed of pits and mirror surfaces on one of the inner circumference side and the outer circumference side with reference to the track center scanned by the reproduction light beam. At the same time, the negative logic data is formed on the other side of the inner circumference side or the outer circumference side as an inverted pit row in which the pits in the pit row and the mirror surface are inverted. In the second recording mode, the data obtained by a predetermined logical operation between the data recorded in the previous (n-1) continuous tracks and the input data is recorded in the second recording mode. Then, on the track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium, on the mirror surface, the wobble pits located at a position deviated from the track center, and on the track center. A data recording device for an optical recording medium, wherein the above-mentioned recording data is expressed and recorded by a non-wobble pit located. 7. In the first recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data for the next track. Pit data is generated, and in the second recording mode, data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is recorded on the next track. Arithmetic processing means for generating wobble pit data and non-wobble pit data, a light source for emitting a light beam for data recording, and light for intensity-modulating the light beam from the light source according to the pit data from the arithmetic processing means. A modulator, an optical deflector for minutely deflecting the light beam from the light source according to the wobble pit data from the arithmetic processing means, and the light modulation from the light source. And an objective lens for converging the light beam incident through the optical deflector on the recording surface of the optical recording medium, and a beam spot of the light beam passing through the objective lens relatively moving in the radial direction of the optical recording medium. The moving means and the control means for switching the operation mode between the first recording mode and the second recording mode are provided, and in the first recording mode, the data recorded on the previous (n-1) consecutive tracks is recorded. The data obtained by a predetermined logical operation between the input data and the input data is used as the recording data of the next track, and a pit is formed on the track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. The above-mentioned record data is recorded as a pit train composed of a mirror surface and the data recorded on the previous consecutive (n-1) tracks and the input data in the second record mode. The data obtained by a predetermined logical operation with the data is used as the recording data of the next track, and the track having the track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium is provided with the mirror surface. A data recording device for an optical recording medium, wherein the recording data is expressed and recorded by a wobble pit located at a position offset from the track center and a non-wobble pit located on the track center. 8. In the first recording mode, pit data and inverted pit data in which positive logical data and negative logical data obtained by logical operation of positive logic and negative logic of input data are used as recording data of the next track are generated. However, in the second recording mode, the pit data in which the data obtained by a predetermined logical operation between the data recorded in the previous (n-1) continuous tracks and the input data is the recording data of the next track is generated. In the third recording mode, the wobble pit data that is the recording data of the next track is the data obtained by the predetermined logical operation of the data recorded on the previous (n-1) continuous tracks and the input data in the third recording mode. And arithmetic processing means for generating non-wobble pit data, a light source for emitting a light beam for data recording, and the arithmetic processing for the light beam from the light source. An optical modulator for intensity-modulating according to pit data from a step, an optical deflector for minutely deflecting a light beam from the light source according to wobble pit data from the arithmetic processing means, and an optical modulator from the light source. And an objective lens for converging the light beam incident through the optical deflector on the recording surface of the optical recording medium, and a beam spot of the light beam passing through the objective lens relatively moving in the radial direction of the optical recording medium. A moving means and a control means for switching the operation mode among the first recording mode, the second recording mode, and the third recording mode are provided. In the first recording mode, the reproduction light on the recording surface of the optical recording medium is reproduced. On the track having a track pitch substantially equal to the spot size of the beam, with respect to the track center scanned by the reproduction light beam, the inner or outer circumference side thereof The positive logic data is recorded as a pit row consisting of pits and a mirror surface on one side, and the negative pit row is a reverse pit row in which the pits in the pit row and the mirror surface are reversed on the other side on the inner or outer circumference side. In the second recording mode, the logical data is recorded, and in the second recording mode, the data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is recorded on the next track. The above recording data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of the spot size of the reproducing light beam on the recording surface of the optical recording medium. Then, the data obtained by a predetermined logical operation between the data recorded on the previous consecutive (n-1) tracks and the input data is transferred to the next track. As a record data, a mirror surface, a wobble pit located at a position deviated from the track center, and a track center on a track having a track pitch of 1 / n of a spot size of a reproduction light beam on a recording surface of an optical recording medium. A data recording device for an optical recording medium, wherein the above-mentioned recording data is expressed and recorded by a non-wobble pit located above. 9. The reproduction data is expressed by positive logic data and negative logic data, and the reproduction light is recorded on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. With the track center scanned by the beam as a reference, the positive logic data is recorded as a pit row composed of pits and a mirror surface on one of the inner peripheral side or the outer peripheral side, and the other on the inner peripheral side or the outer peripheral side. The first recording mode in which the negative logic data is recorded as an inverted pit train in which the pits in the pit train and the mirror surface are reversed, or the data and the input data recorded in the preceding (n-1) continuous tracks. The data obtained by a predetermined logical operation of the In the second recording mode in which the recording data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of the track size, an optical beam for reproducing the recording data from the optical recording medium on which the data is recorded. A data reproducing device for a recording medium, which irradiates the recording surface of an optical recording medium with a reproducing light beam and outputs a detection signal according to the amount of light reflected or transmitted by the recording surface. An RF signal and a push-pull signal are generated from the detection signal from the pickup and the optical pickup, and the record data is reproduced from the RF signal and the push-pull signal by a logical operation corresponding to the first recording mode or the second recording mode. In the first reproduction mode, the arithmetic processing means and the control means for switching the operation mode between the first reproduction mode and the second reproduction mode are provided. Scans a track on the recording surface on which data is recorded in the first recording mode with the optical beam for reproduction by the optical pickup, and reproduces the recorded data in the first recording mode from the optical recording medium. In the second reproducing mode, the track on the recording surface on which the data is recorded in the second recording mode is scanned by the optical beam for reproduction by the optical pickup to record the data in the second recording mode. A data reproducing apparatus for an optical recording medium, which reproduces from an optical recording medium. 10. The recording data is represented by positive logic data and negative logic data, and the reproduction light beam is recorded on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. With the track center scanned by the beam as a reference, the positive logic data is recorded as a pit row consisting of pits and a mirror surface on one of the inner peripheral side or the outer peripheral side, and the above-mentioned on the other inner or outer peripheral side. The first recording mode in which the negative logic data is recorded as an inverted pit train in which the pits in the pit train and the mirror surface are reversed, or the data and the input data recorded in the previous consecutive (n-1) tracks The data obtained by a predetermined logical operation with the The recording data is expressed and recorded on a track having a track pitch of 1 / n of a bit size by a mirror surface, wobble pits located at a position offset from the track center, and non-wobble pits located on the track center. A data reproducing apparatus for an optical recording medium which reproduces recorded data from an optical recording medium on which data is recorded in a second recording mode, wherein the recording surface of the optical recording medium is irradiated with a reproducing light beam for recording. An optical pickup that outputs a detection signal according to the amount of reflected light or transmitted light of the light beam by a surface, an RF signal and a push-pull signal are generated from the detection signal by the optical pickup, and the RF signal and the push-pull signal are generated from the RF signal and the push-pull signal. Arithmetic processing means for reproducing the recorded data by a logical operation corresponding to the first recording mode or the second recording mode; And a control means for switching the operation mode between the second reproduction mode and the second reproduction mode. In the first reproduction mode, the track on the recording surface on which the data is recorded in the first recording mode is reproduced by the optical pickup. The recording data in the first recording mode is reproduced from the optical recording medium by scanning with a light beam for recording, and in the second reproducing mode, the track on the recording surface on which the data is recorded in the second recording mode. A data reproducing apparatus for an optical recording medium, wherein the optical pickup is used to scan the optical recording medium with a reproduction light beam to reproduce recorded data in the second recording mode from the optical recording medium. 11. Data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is recorded data on the next track,
A second recording mode in which the above-mentioned recording data is recorded as a pit string consisting of pits and a mirror surface on a track having a track pitch of 1 / n of the spot size of a reproduction light beam on the recording surface of an optical recording medium, or Data obtained by a predetermined logical operation between the data recorded on the previous (n-1) continuous tracks and the input data is used as the recording data of the next track, and the reproduction light on the recording surface of the optical recording medium is used. The recorded data is represented on a track having a track pitch of 1 / n of the beam spot size by a mirror surface, a wobble pit located at a position offset from the track center, and a non-wobble pit located on the track center. Data in an optical recording medium for reproducing recorded data from an optical recording medium on which data is recorded in a second recording mode An optical pickup that is a raw device, irradiates a recording light surface of an optical recording medium with a reproduction light beam, and outputs a detection signal according to the amount of reflected light or transmitted light of the light beam by the recording surface, Arithmetic processing means for generating an RF signal and a push-pull signal from a detection signal by the optical pickup, and reproducing recorded data by a logical operation corresponding to the first recording mode or the second recording mode from the RF signal and the push-pull signal. , A control means for switching the operation mode between a first reproduction mode and a second reproduction mode. In the first reproduction mode, a track on the recording surface on which data is recorded in the first recording mode is recorded on the optical disc. The pick-up scans the reproduction light beam to reproduce the record data in the first recording mode from the optical recording medium, and in the second reproduction mode, the second recording mode. A track on the recording surface on which data is recorded in the recording mode is scanned with a reproduction light beam by the optical pickup to reproduce the record data in the second recording mode from an optical recording medium. Data reproducing device for recording medium. 12. The reproduction data is represented by positive logic data and negative logic data, and the reproduction light is recorded on a track having a track pitch substantially equal to the spot size of the reproduction light beam on the recording surface of the optical recording medium. With the track center scanned by the beam as a reference, the positive logic data is recorded as a pit row composed of pits and a mirror surface on one of the inner peripheral side or the outer peripheral side, and the other on the inner peripheral side or the outer peripheral side. The first recording mode in which the negative logic data is recorded as a reversed pit train in which the pits in the pit train and the mirror surface are reversed, the previous continuous (n-
1) The data obtained by a predetermined logical operation of the data recorded on one track and the input data is used as the recording data of the next track, and 1 / of the spot size of the reproducing light beam on the recording surface of the optical recording medium is used. A second recording mode in which the above recording data is recorded in a track having a track pitch of n as a pit string consisting of pits and a mirror surface, or data recorded in the previous (n-1) continuous tracks. The data obtained by a predetermined logical operation with the input data is used as the recording data of the next track, and the spot size of the reproducing light beam on the recording surface of the optical recording medium is 1
A third surface for recording and recording the recording data on a track having a track pitch of / n by a mirror surface, a wobble pit located at a position deviated from the track center, and a non-wobble pit located on the track center. A data reproducing apparatus for an optical recording medium, which reproduces recorded data from an optical recording medium on which data is recorded in a recording mode, wherein a recording surface of the optical recording medium is irradiated with a reproducing light beam, An optical pickup that outputs a detection signal according to the amount of reflected light or transmitted light of a light beam, an RF signal and a push-pull signal are generated from the detection signal by the optical pickup, and a first signal is generated from the RF signal and the push-pull signal. Arithmetic processing means for reproducing recorded data by logical operation corresponding to the recording mode, the second recording mode or the third storage mode; A control means for switching the operation mode among the first reproduction mode, the second reproduction mode and the third reproduction mode is provided, and in the first reproduction mode, on the recording surface on which the data is recorded in the first recording mode. Is scanned by the optical beam for reproduction by the optical pickup to reproduce the record data in the first recording mode from the optical recording medium, and in the second reproduction mode, the data is recorded in the second recording mode. The recorded track on the recording surface is scanned by the reproduction optical beam by the optical pickup to reproduce the record data in the second recording mode from the optical recording medium, and in the third reproduction mode, the third recording mode. In the recording mode, the track on the recording surface on which the data is recorded is scanned by the optical beam for reproduction by the optical pickup to reproduce the recorded data in the third recording mode from the optical recording medium. Data reproducing apparatus for an optical recording medium characterized and.