JPH10134356A - Optical disk and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform precise tracking in a recorded/reproduced optical disk by beforehand recording a recording mark showing the erasure of the data on all recording tracks of a groove and a land. SOLUTION: When the data are recorded on the land or the groove on the optical disk 53 by an optical disk device, the recording mark D is recorded. When the data recorded on the land or the groove on the disk 53 are erased, the recording mark D recorded with the data isn't erased in the disk 53, but is re-written to a recording mark C to be recorded. In the case of this disk 53, even though the data are erased, the recording mark C showing this (erasure) is recorded, and the disk 53 is in the state that the recording mark is recorded always. Thus, when a beam moves from left toward right of the disk 53, since an offset voltage doesn't occur in an output of a differential amplifier, the beam can perform tracking on a track center always.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk and an optical disk apparatus for recording and reproducing data on and from both an optical disk having concentric or spiral recording tracks of grooves and lands. .

[0002]

2. Description of the Related Art In conventional optical discs, a signal serving as information is recorded on either a land or a groove provided on a substrate. However, in order to further improve the recording density, the signal is recorded on both the land and the groove. Recording methods have been proposed. For example, Japanese Patent Publication No. 63-5785
Japanese Patent Laid-Open No. 9-1994 proposes an optical disk device that records information on both lands and grooves. In this example, a method is disclosed in which a signal recorded in a land and a groove is reproduced by inverting a signal polarity of a tracking control system between a case where tracking is performed on a land and a case where tracking is performed on a groove.

Ono et al. Have reported an example using such a method for a phase change recording medium (National T
echnical Report Vol.41 No.6 Dec.1995). In this example, when a phase-change recording film is used as the recording film, the amount of signal leakage (crosstalk) from a land to a groove or from a groove to a land at a specific groove depth (λ / 6) is a minimum value. By using an optical disc as a phase change recording medium having this groove depth,
This indicates that high-density recording is possible.

However, in an optical disc for recording and reproducing information on both lands and grooves, if information is recorded on only one of the lands or grooves,
There is a problem that an offset voltage is generated on the tracking error signal and accurate tracking cannot be performed.

[0005]

As described above, in an optical disc on which information is recorded on both lands and grooves, when information is recorded on only one of the lands or grooves, an offset voltage is generated on the tracking error signal. However, there was a problem that accurate tracking could not be performed.

Accordingly, an object of the present invention is to provide an optical disk and an optical disk device capable of performing accurate tracking in an optical disk for recording and reproducing data on lands and grooves.

[0007]

An optical disk according to the present invention has concentric or spiral recording tracks of grooves and lands, and records and reproduces data on both the grooves and lands. A recording mark indicating data erasure is recorded in advance on all recording tracks of the groove and the land.

The optical disk of the present invention has concentric or spiral recording tracks of grooves and lands, and data is recorded and reproduced on both the grooves and lands. Either the first recording mark or the second recording mark, or the first
And the second recording mark are recorded in a mixed manner.

The optical disk device of the present invention comprises recording means for recording a recording mark indicating data erasure on a groove and a land of the optical disk. An optical disc apparatus according to the present invention is an optical disc apparatus that records and reproduces data on both grooves and lands on an optical disc having concentric or spiral grooves and lands. And a second recording means for recording a recording mark for recording data on the groove and the land of the optical disc.

An optical disk apparatus according to the present invention is an optical disk apparatus for recording and reproducing data on and from both an optical disk having concentric or spiral recording tracks of grooves and lands. First recording means for recording recording marks indicating erasure of data in grooves and lands, second recording means for recording recording marks for recording data in grooves and lands of the optical disc,
When erasing the data recorded by the second recording means,
And control means for controlling the rewriting of the recording mark on which the data is recorded to the recording mark indicating the erasure of the data using the first recording means.

An optical disk apparatus according to the present invention is an optical disk apparatus for recording and reproducing data on and from both an optical disk having concentric or spiral grooves and land recording tracks. First recording means for recording a first recording mark on a groove and a land; second recording means for recording a second recording mark on a groove and a land of the optical disc; The first recording mark or the second
The first recording means and the control means for controlling the second recording means in a state where the recording mark is always recorded.

An optical disk recording method according to the present invention is a method for recording an optical disk having concentric or spiral recording tracks of grooves and lands, and recording and reproducing data on both of the grooves and lands. Either the first recording mark or the second recording mark, or the first recording mark and the second recording mark are recorded on all the recording tracks of the groove and the land. It is characterized by the following.

An optical disk recording method according to the present invention is a method for recording an optical disk having concentric or spiral recording tracks of grooves and lands, and recording and reproducing data on both of the grooves and lands. A recording mark indicating data erasure and a recording mark for recording data are recorded on grooves and lands of the optical disc.

According to the data erasing method of the optical disk device of the present invention, an optical disk device having concentric or spiral recording tracks of grooves and lands is used for recording and reproducing data on both the grooves and lands. In a data erasing method, when erasing data recorded in the grooves and lands of the optical disc, a recording mark in which data is recorded is rewritten to a recording mark indicating data erasure.

A recording control method for an optical disk apparatus according to the present invention is directed to an optical disk apparatus having a recording track of concentric or spiral grooves and lands for recording and reproducing data on both the grooves and lands. A recording control method, wherein all recording tracks of the groove and the land of the optical disc are either one of a first recording mark and a second recording mark, or a mixture of the first recording mark and the second recording mark. And control is performed so as to be always recorded.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a recording / reproducing optical disk (RAM) 53 according to the present invention. In each recording area of block data, preformat data (for example, 54 bytes) of a header portion is previously stored at a boundary between a groove and a land. It is formed in an embossed form on a substrate. In other parts, FIG.
As shown in (1), recording data as recording marks is recorded on each of the groove and the land.

FIG. 4 shows an example of the data structure of the header section.
However, EC code is included in the 12-byte synchronization code part VFO3.
The data is recorded prior to the recording of the C block data, and the PLL is corrected by the recorded synchronization code at the time of reproduction.

Next, an optical disk apparatus for recording data on the recording / reproducing optical disk 53 and reproducing the recorded data will be described with reference to FIG. Recording and reproduction on the optical disk 53 are performed by the optical head 5. The optical head 5 is fixed to a drive coil 7 constituting a movable portion of a linear motor 6, and the drive coil 7 is connected to a linear motor control circuit 8.

A speed detector 9 is connected to the linear motor control circuit 8, and a speed signal from the speed detector 9 is sent to the linear motor control circuit 8. Further, a permanent magnet (not shown) is provided at a fixed portion of the linear motor 6, and when the drive coil 7 is excited by the linear motor control circuit 8, the optical head 5
The optical disk 53 is moved in the radial direction.

An objective lens 10 is held on the optical head 5 by a wire or a leaf spring (not shown).
The objective lens 10 is moved in the focusing direction (the optical axis direction of the lens) by the drive coil 12 and is movable in the tracking direction (the direction orthogonal to the optical axis of the lens) by the drive coil 11.

The laser light (laser beam) generated by the semiconductor laser oscillator (or argon neon laser oscillator) 19 driven by the laser control circuit 13 is supplied to a collimator lens 20, a half prism 21,
Irradiated on the optical disk 53 via the objective lens 10,
The reflected light from the optical disk 53 is
The light is guided to a photodetector 24 via a half prism 21, a condenser lens 22, and a cylindrical lens 23.

The photodetector 24 includes a four-divided photodetector cell 24.
a, 24b, 24c and 24d.
The output signal of the photodetector cell 24a of the photodetector 24 is supplied to one end of adders 26a and 26d via the amplifier 25a, and the output signal of the photodetector cell 24b is supplied to the adders 26b and 26c via the amplifier 25b. The output signal supplied to one end and output from the photodetection cell 24c is supplied to the adder 2 via the amplifier 24c.
The output signals of the photodetection cells 24d supplied to the other ends of the photodetectors 6a and 26c are added to adders 26b and 26d via an amplifier 25d.
Is supplied to the other end.

The output signal of the adder 26a is a differential amplifier OP
2 and the non-inverting input terminal of the differential amplifier OP2 is supplied with the output signal of the adder 26b.
As a result, the differential amplifier OP2 includes the adders 26a, 26
A signal related to the focus point is supplied to the focusing control circuit 27 in accordance with the difference b. The output signal of the focusing control circuit 27 is supplied to the focusing drive coil 12, and the laser beam is
3 is controlled so as to be always in just focus.

The output signal of the adder 26d is a differential amplifier OP
1, and the output signal of the adder 26c is supplied to the non-inverting input terminal of the differential amplifier OP1.
As a result, the differential amplifier OP1 includes the adders 26d and 26d.
A track error signal is supplied to the tracking control circuit 28 in accordance with the difference c. The tracking control circuit 28 creates a track drive signal according to the track error signal supplied from the differential amplifier OP1.

The track error signal is shown in FIG.
As shown in (b), the position of the laser beam changes with respect to the groove and the land. That is, when the position of the laser beam is located at the center of the groove or land, the track error signal is 0, and the difference increases as the distance from the center increases.

The track driving signal output from the tracking control circuit 28 is the driving coil 1 in the tracking direction.
1 is supplied. The track difference signal used in the tracking control circuit 28 is supplied to the linear motor control circuit 8.

The supply of the track drive signal to the drive coil 11 allows the optical disk 53 to rotate during one rotation.
The objective lens 10 moves gradually from groove to groove or from land to land by one track.

When the objective lens 10 is moved by the tracking control circuit 28, the linear motor control circuit 8
Moves the linear motor 6, that is, the optical head 5, so that the objective lens 10 is located near the center position in the optical head 5.

A data generation circuit 14 is provided at a stage preceding the laser control circuit 13. The sum signal of the outputs of the photodetecting cells 24a to 24d of the photodetector 24 in the state where the focusing and tracking are performed, that is, the adder 26
The output signal from e reflects changes in reflectivity from pits (recording data) formed on the grooves and lands of the track. This signal is supplied to the data reproducing circuit 18, which outputs an access permission signal for the ECC block of the ID to be recorded, and outputs reproduced data for the ECC block of the ID to be reproduced. It has become so.

The reproduced data reproduced by the data reproducing circuit 18 is subjected to error correction using an error correction code ECC provided by an error correction circuit 32, and thereafter, an optical disk control as an external device is performed via an interface circuit 35. The data is output to the device 36A.

When the CPU 30A moves the laser beam from the tracked land to the adjacent groove or from the tracked groove to the adjacent land, the CPU 30A sends a track on / off signal and a tracking polarity switching signal to the tracking control circuit 28A. , And outputs a jump pulse.

As shown in FIG. 7, the data reproducing circuit 18 comprises a comparing circuit 61, a header synchronous code detecting circuit 62, a header reading circuit 63, an ECC block synchronous code detecting circuit 64, and a data reading circuit 65. .

The comparison circuit 61 outputs a sum signal of the outputs of the photodetection cells 24a to 24d of the photodetector 24 from the adder 26e, that is, the sum signal of the track groove and the pits (recording data) formed on the land. This circuit binarizes the change in reflectance by comparing the change with a reference signal. The binarized signal of the comparison circuit 61 is supplied to a header synchronization code detection circuit 62, a header reading circuit 63, an ECC block synchronization code detection circuit 64, and a data reading circuit 65.

The header synchronization code detection circuit 62 is a circuit for detecting a synchronization code for detecting the ID of the header based on the binary data from the comparison circuit 61. The detection signal of the header synchronization code detection circuit 62 is supplied to the header reading circuit 63.

The header reading circuit 63 reads the address ID according to the detection signal from the header synchronization code detection circuit 62, and reads the address ID from the optical disk control device 3 as an external device.
When the access ID supplied from 6 matches, an access permission signal is output. The access permission signal of the header reading circuit 63 is supplied to the ECC block synchronization code detection circuit 64, the data reading circuit 65, and the data generation circuit 14.

ECC block synchronization code detection circuit 64
Is a circuit for detecting the synchronization code for the ECC block from the binary data from the comparison circuit 61 for the number of bytes corresponding to the ECC block after the access permission signal from the header reading circuit 63 is supplied. The detection signal of the ECC block synchronization code detection circuit 64 is supplied to the data reading circuit 65.

The data reading circuit 65 includes a header reading circuit 6
After the access permission signal is supplied from the ECC block 3, every time the detection signal is supplied from the ECC block synchronization code detection circuit 64, the circuit reads 91-byte data supplied continuously thereafter as reproduction data. The reproduced data from the data reading circuit 65 is demodulated by a demodulation circuit (not shown) and supplied to the error correction circuit 32.

The laser control circuit 13 changes the intensity of the laser light according to the target optical disk. The data generation circuit 14 outputs recording data to the laser control circuit 13 in response to an access permission signal from the header reading circuit 63 during data recording.

As shown in FIG. 8, the tracking control circuit 28A comprises changeover switches 71 and 72, a polarity inversion circuit 7
3. Phase compensation circuit 74, adder 75, and drive circuit 7
6.

The changeover switch 71 is switched by a track on / off signal (tracking servo loop on / off) from the CPU 30A as shown in FIG. 9D, and the track on / off signal is turned on. At the time
A track error signal from the differential amplifier OP1 as shown in FIG. 9A is output to the changeover switch 72 and the polarity inversion circuit 73.

The changeover switch 72 is switched by a tracking polarity switching signal (land / groove switching signal) from the CPU 30A, as shown in FIG. 9C, and is used when the polarity of the tracking polarity switching signal is groove. And outputs the track error signal from the changeover switch 72 to the phase compensation circuit 74. If the polarity of the tracking polarity switching signal is a land, outputs the track error signal whose polarity has been inverted by the polarity inversion circuit 73 to the phase compensation circuit 74. Is what you do.

The polarity inverting circuit 73 inverts the polarity of the track error signal supplied from the differential amplifier OP1 via the changeover switch 71, and its output is supplied to the changeover switch 72.

The phase compensating circuit 74 compensates the phase of the positive (positive phase) track error signal or the reverse polarity (negative phase) track error signal supplied from the changeover switch 72 and outputs the same to the adder 75. It is.

The adder 75 is provided with a positive (positive phase) track error signal or a reverse polarity (negative phase) track error signal whose phase is compensated and supplied from the phase compensating circuit 74, and (b) of FIG. The jump pulse from the CPU 30A is added as shown in FIG. 7, and the addition result becomes a track drive signal, which is output to the drive circuit 76.

The drive circuit 76 moves the objective lens 10 in the tracking direction by driving the drive coil 11 based on the track drive signal from the adder 75. That is, the tracking position by the laser beam (laser light) is moved from the land to the adjacent groove by the jump pulse as shown in FIG. 9B.

FIG. 9A to FIG. 9D show the operation when the laser beam moves to the outer (adjacent) groove from the state where it is tracking the land and tracks the groove. Description will be made using the signal waveforms shown.

First, when the laser beam is tracking the land, the changeover switch 72 is switched to the polarity reversing circuit 73 by the tracking polarity switching signal from the CPU 30A. As a result, the polarity of the track error signal is inverted by the polarity inverting circuit 73 via the changeover switch 71, and further, the phase compensation circuit 7 is changed over by the changeover switch 72.
After the phase is compensated in 4 to be a track drive signal, it is supplied to the drive circuit 76. Thus, the drive circuit 76 drives the drive coil 11 according to the track drive signal, thereby tracking the laser beam of the objective lens 10 to the land.

When moving, the changeover switch 71 is turned off by turning off the track on / off signal from the CPU 30A, and the tracking servo loop is turned off. At this time, the jump pulse from the CPU 30A is supplied to the adder 7.
5 is supplied to the drive circuit 76. As a result, the drive circuit 76 drives the drive coil 1 by the jump pulse.
By driving 1, the irradiation position of the laser beam of the objective lens 10 is moved from the current land to the outer (adjacent) groove. After this movement is made, the CPU 30A again
When the track on / off signal is turned on and the changeover switch 71 is turned on, the tracking servo loop is turned on.

Thus, the laser beam from the objective lens 10 is tracked in the groove. That is, C
The changeover switch 72 is switched to the changeover switch 71 side by the tracking polarity switching signal from the PU 30A. Thus, the track error signal is output to the changeover switch 71,
The phase is compensated by a phase compensating circuit 74 via 72, and is converted into a track drive signal, which is then supplied to a drive circuit 76. Thus, the drive circuit 76 drives the drive coil 11 in accordance with the track drive signal, thereby tracking the laser beam of the objective lens 10 to the groove.

In this case, the waveform of the jump pulse may be reversed so that the jump pulse moves to the inner (adjacent) groove. The same applies to the case where the laser beam moves to the outer (adjacent) land from the state of tracking the groove and tracks the land. However, the waveforms of the jump pulses are out of phase.

Next, the processing when the optical disk 53 is loaded in the above configuration will be described with reference to the flowchart shown in FIG. That is, when an optical disc is loaded by a loading mechanism (not shown),
The U30A drives and controls the motor 3 by the motor control circuit 4, so that the optical disk 53 is rotated at a predetermined rotation speed.

Then, the optical head 5 is moved to a position opposed to the innermost peripheral portion of the optical disk 53 as an initial position, and a focus pull-in process is performed. That is, the CPU 30A
By outputting a reproduction control signal to the laser control circuit 13, a laser beam for reproduction from the semiconductor laser oscillator 19 in the optical head 5 is irradiated onto the optical disk via the objective lens 10 by the laser drive circuit 13. The laser beam reflected from the optical disk 53 is guided to the photodetector 24 via the objective lenses 10, 21, 22, and 23. Then, a focusing signal is obtained by the differential amplifier OP2 based on the difference between the sum signal of the detection cells 24a and 24c of the photodetector 24 and the sum signal of the detection cells 24b and 24d of the photodetector 24, and the focusing control circuit 27 Output to As a result, the focusing control circuit 27 controls the driving coil 12 by the supplied focusing signal.
When the objective lens 10 is moved by exciting the laser beam, focusing of the laser beam applied to the optical disk 53 is performed.

In the state where the focus pull-in process has been performed, the difference between the sum signal of the detection cells 24a and 24d of the photodetector 24 and the sum signal of the detection cells 24b and 24c of the photodetector 24 is determined by a differential amplifier. In OP1, it is supplied to the tracking control circuit 28A as a track error signal. On this occasion,
Since the tracking polarity signal for the groove is supplied to the tracking control circuit 28A by the CPU 30A, the track error signal from the differential amplifier OP1 is directly passed through the changeover switches 71 and 72 to the phase compensation circuit 73.
Is output to The phase compensation circuit 74 compensates the phase of the supplied track error signal, and outputs the same as a drive signal to the drive circuit 76 via the adder 75.

The drive circuit 76 moves the objective lens 10 by the drive coil 11 in accordance with the supplied drive signal, thereby performing tracking correction for a minute movement of the laser beam irradiated on the optical disk 53 via the objective lens 10. Done.

Accordingly, the innermost peripheral portion of the optical disk 53 is irradiated with the laser beam from the optical head 5. In this state, the read signal of the data on the innermost track is binarized by the comparison circuit 62 in the data reproduction circuit 18, and the header synchronization code detection circuit 62, the header read circuit 63,
It is supplied to a CC block synchronization code detection circuit 64 and a data reading circuit 65.

When the header synchronization code is detected by the header synchronization code detection circuit 62, the address reading section ID is read by the header reading circuit 63, and the disc identification data to be accessed supplied from the optical disc control device 36 as an external device. When the address matches the address ID, the access permission signal is output to the ECC block synchronization code detection circuit 64 and the data reading circuit 65.

Next, every time the ECC block synchronization code detection circuit 64 detects the synchronization code of the ECC block, the data reading circuit 65 reads the data as reproduction data to be supplied subsequently and demodulates it by a demodulation circuit (not shown). Output to the error correction circuit 32.

The error correction circuit 32 corrects the error using the error correction code ECC given to the supplied reproduction data, and then performs the interface correction.
Via the optical disk control device 36 as an external device.

As a result, the disc identification data is supplied to the optical disc control unit 36. Optical disk controller 36
Is used to determine whether the loaded optical disk is an optical disk (RAM) 53 for recording and reproducing and recording data in grooves and lands based on the supplied disk identification data. It discriminates whether the position is a groove or a land, and outputs the discrimination result and an address ID for recording or reproducing (accessing) to the CPU 30A via the interface circuit 35.

Also, the CPU 30A changes the tracking polarity signal output to the tracking control circuit 28A to that for the land only when the determination result that the access position is the land is supplied from the optical disk control device 36. As a result, the changeover switch 72 is switched, and the track error signal from the differential amplifier OP1 is supplied to the polarity inversion circuit 73 via the changeover switch 71, inverted by the polarity inversion circuit 73, and output to the phase compensation circuit 74. As a result, tracking correction for minute movement of the laser beam is performed by the tracking control circuit 28A with the polarity (opposite phase) matched to the land.

As will be described in detail later, the optical disk apparatus of this embodiment records a recording mark D for recording data on a recording track of a land and a groove of the optical disk 53 and a recording mark C indicating an "erased" state. be able to.

When recording data, the CPU 30
The recording mark C indicating "erasing" by A
Is rewritten. When erasing data, the CPU 30A performs control to rewrite the recording mark D to be erased with the recording mark C indicating “erasing”.

Next, tracking in the optical disk 53 of the present invention in such a configuration will be described. FIG. 1 shows a recording state on the optical disk 53 of the present application.

In FIG. 1A, the optical disk 53
It is assumed that the recording marks C are recorded in advance on the lands and the grooves by the above-described optical disk device. The recording mark C of this optical disk device indicates an "erased" state.

When data is recorded on a land or a groove of the optical disk 53 by the above-described optical disk device, a recording mark D is recorded. Further, when erasing data recorded on a land or a groove of the optical disc 53, the optical disc 53 is rewritten to a recording mark C instead of erasing the recording mark D where data is recorded. .

On the other hand, conventionally, as shown in FIG. 11, when data is recorded on lands and grooves of an optical disk, a recording mark D is recorded, but no data is recorded or data is erased. If it does, the record mark is also erased.

When information is reproduced in the recording state of the optical disk as shown in FIG. 11, the right land, groove, and land in FIG. 11 have recording marks, and the left land and groove have information. Is erased (the recording mark is erased), and the output of the differential amplifier OP1 when the laser beam moves from left to right in the drawing of the optical disk is as shown in FIG. The difference signal does not pass through the origin, and an offset voltage is generated. Therefore, if the tracking control circuit 28a controls the differential output to be 0, tracking is performed at a position shifted from the original track center.

On the other hand, in the case of the optical disk 53 of the present invention shown in FIG.
Is recorded, and the recording mark (recording mark C or recording mark D) is always recorded. Therefore, when the laser beam moves from left to right in the drawing of the optical disk 53 in FIG. The output of the differential amplifier OP1 is as shown in FIG. This output is 0 at the track center.
And no offset voltage is generated. Therefore, the track center can always be tracked.

At this time, the recording mark C indicating erasure is preferably other than the data pattern indicating the recording mark D. For example, a data pattern different from the modulation rule used for recording can be considered. In short, it is only necessary that the recording mark C or the recording mark D is recorded when the tracking operation is performed, and that the recording mark is always recorded on all the recording tracks of the optical disc.

As described above, according to the embodiment of the present invention, by recording the recording mark indicating the erasure of information, the recording mark always exists regardless of the land or the groove even in the data erasing state. In this state, the output of the differential amplifier does not cause an offset, and the tracking of the track center can be always performed.

[0071]

As described in detail above, according to the present invention,
It is possible to provide an optical disk and an optical disk device capable of performing accurate tracking in an optical disk for recording and reproducing data on lands and grooves.

[Brief description of the drawings]

FIG. 1 is a diagram showing a data recording state of an optical disc for explaining an embodiment of the present invention.

FIG. 2 is a diagram showing an example of data recording on an optical disc on which data is recorded in grooves and lands.

FIG. 3 is a diagram showing the formation of a recording mark on an optical disc on which data is recorded in grooves and lands.

FIG. 4 is a diagram showing a configuration example of an ECC block address (header part).

FIG. 5 is a block diagram showing a schematic configuration of an optical disk device.

FIG. 6 is a diagram for explaining track error signals for lands and grooves.

FIG. 7 is a diagram showing a schematic configuration of a data reproducing circuit.

FIG. 8 is a diagram showing a schematic configuration of a tracking control circuit.

FIG. 9 is a diagram showing signal waveforms of main parts when shifting from land tracking to groove tracking.

FIG. 10 is a flowchart for explaining a reproducing operation.

FIG. 11 is a diagram showing a data recording state of a conventional optical disc.

FIG. 12 is a diagram illustrating an output of a differential amplifier in which a laser beam moves.

FIG. 13 is a diagram illustrating an output of a differential amplifier in which a laser beam moves.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Glass substrate 5 ... Optical head (recording means) 10 ... Objective lens 11, 12 ... Drive coil 13 ... Laser control circuit 18 ... Data reproduction circuit 19 ... Semiconductor laser oscillator 20 ... Collimator lens 21 ... Half prism 22 ... Condensing lens Reference numeral 23: cylindrical lens 24: photodetector OP1: differential amplifier 28, 28A: tracking control circuit 30, 30A: CPU 33: memory 53: optical disk

Claims (11)

[Claims] 1. An optical disk having concentric or spiral recording tracks of grooves and lands, and recording and reproducing data on both the grooves and lands. An optical disc on which a recording mark indicating data erasure is recorded. 2. An optical disc having concentric or spiral recording tracks of grooves and lands and recording and reproducing data on both the grooves and lands, wherein all recording tracks of the grooves and lands are: An optical disc characterized by recording either one of a first recording mark or a second recording mark, or a mixture of the first recording mark and the second recording mark. 3. An optical disk apparatus for recording and reproducing data on and from both an optical disk having concentric or spiral recording tracks of grooves and lands, wherein the data is recorded on the grooves and lands of the optical disk. An optical disc device comprising a recording means for recording a recording mark indicating erasure of a data. 4. The optical disk device according to claim 3, wherein the recording mark indicating erasure of data recorded by said recording means is selected from a recording pattern for reducing an offset of a tracking error signal in said optical disk device. . 5. An optical disc apparatus for recording and reproducing data on both grooves and lands on an optical disc having concentric or spiral recording tracks of grooves and lands, wherein the data is recorded on the grooves and lands of the optical disc. An optical disc device comprising: first recording means for recording a recording mark indicating the erasure of data; and second recording means for recording a recording mark for recording data on a groove and a land of the optical disc. 6. An optical disc apparatus for recording and reproducing data on both grooves and lands on an optical disc having concentric or spiral recording tracks of grooves and lands, wherein the data is recorded on the grooves and lands of the optical disc. First recording means for recording a recording mark indicating erasure of data, second recording means for recording a recording mark for recording data on a groove and a land of the optical disc, and data recorded by the second recording means. When deleting,
An optical disc device comprising: control means for performing control of rewriting a recording mark on which data is recorded to a recording mark indicating data erasure using the first recording means. 7. An optical disc apparatus for recording and reproducing data on and from both optical discs having concentric or spiral recording tracks of grooves and lands, comprising: A first recording means for recording one recording mark; a second recording means for recording a second recording mark on a groove and a land of the optical disc; and a first recording mark or a groove on the groove and the land of the optical disc. An optical disc device comprising: the first recording means and a control means for controlling the second recording means in a state where the second recording mark is always recorded. 8. A recording method for an optical disk having concentric or spiral recording tracks of grooves and lands, and recording and reproducing data on both of the grooves and lands. An optical disc characterized in that either one of a first recording mark or a second recording mark, or a mixture of the first recording mark and the second recording mark is recorded on a recording track. Recording method. 9. A recording method for an optical disk having concentric or spiral recording tracks of grooves and lands, wherein data is recorded and reproduced on both the grooves and lands. A recording method for an optical disk, wherein a recording mark indicating erasure of data and a recording mark for recording data are recorded. 10. A data erasing method for an optical disk device for recording and reproducing data on and from both optical discs having concentric or spiral recording tracks of grooves and lands. A data erasing method for an optical disk device, wherein when erasing data recorded in a groove and a land, a recording mark in which data is recorded is rewritten to a recording mark indicating erasure of data. 11. A recording control method for an optical disc apparatus for recording and reproducing data on and from both an optical disc having concentric or spiral recording tracks of grooves and lands. All the recording tracks of the groove and the land are always recorded with either the first recording mark or the second recording mark, or the mixture of the first recording mark and the second recording mark. A recording control method for an optical disc device, wherein the recording control method is controlled.