JP2001034951A - Optical disc and optical disc recording piayback apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the read of address information recorded as waveforms of wobbles provided at grooves of a disc for recording signals on lands and grooves even at the record playback time on not only the grooves but lands, using only one laser beam. SOLUTION: A detected wobble waveform 175 intersects time points 1761, 1762,..., 176n ascendingly in relation to a base axis, synchronizing signals D1, D2,..., Dn are generated at the points 1761, 1762,..., 176n, and hence synchronizing signals for playback signals can be generated, without forming special wobbles different from those for forming fine clock marks for generating the synchronizing signals in the tracks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Prior art]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk having a waveform pregroove, and more particularly to an optical disk suitable for a recording / reproducing apparatus for a recordable CD disk or a recordable magneto-optical disk, and a recording / reproducing apparatus therefor. In a mini disk, a groove having a waveform shape of a signal obtained by FM-modulating a carrier serving as a rotation synchronization signal with address information is carved, and is used for rotation control and detection of address information. This method is generally called a wobbling method.

Also, in an optical disc apparatus in which a groove having a waveform shape of a signal obtained by FM-modulating a carrier wave serving as a rotation synchronization signal with address information is recorded on a groove and a land between the grooves, a wobbling method is also used. Has been proposed. In this case, as a method of reading address information, a laser beam emitted from a laser light source of an optical pickup is divided into three beams of a main beam and two sub beams by a diffraction grating.
As shown in FIG. 38, when tracking control is performed with the main beam at the center of the groove, address information is read from the push-pull signal from the main beam. A device that reads address information from a push-pull signal (Japanese Patent Laid-Open No. 7-14172) is known.

[0004]

In the above-mentioned conventional optical disk, the total length of the track is twice as large as that of the optical disk which is recorded only on the groove because the information is recorded on the groove and the land. However, since there is address information only in the groove, optical components such as a diffraction grating for dividing the laser beam emitted from the laser light source of the optical pickup into three beams of a main beam and two sub beams are required.
Another drawback is that the power of the laser beam emitted from the laser light source cannot be used effectively. In particular, in the case of a recordable optical disc, the efficiency of using the power of the laser beam is a major issue.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to address information recorded as a groove waveform by using not only the groove,
This enables reading with only one laser beam during recording and reproduction of lands, and reduces the number of optical components and sufficiently increases the recording density of the disk without impairing the power of the laser beam emitted from the laser light source. It is an object of the present invention to provide an optical disk recording / reproducing apparatus which can be increased in speed.

[0006]

In order to solve the above-mentioned problems, the present invention relates to an optical disc in which at least one wall of a groove is wobbled in the width direction of the groove to form an address information block and an address information block. The address information block is formed by a first wobble, and the data information block is formed by a second wobble having a wavelength longer than the wavelength of the first wobble.

According to the present invention, in an optical disk capable of recording and / or reproducing data on and from a land and a groove, a wobble of a fixed wavelength is continuously formed on the groove, and modulated on one wall of the groove by address information. The obtained wobble is formed intermittently at a predetermined interval. Further, in the present invention, the wobbling cycle of the data information block is in a range of 0.8 to 10 μm,
The wobbling amplitude of the data information block is 5-2.
It is characterized by being in the range of 5 nm.

Further, the present invention is characterized in that a TOC area including information on a correction amount for eliminating leakage of a reproduction signal is provided in an inner peripheral portion and / or an outer peripheral portion. Further, in the present invention, a large number of a specific area in which a signal of a predetermined format equal to a reproduced signal from which a magneto-optical signal is erased and a signal area in which a signal is recorded subsequent to the specific area are provided. Features.

Further, the optical disk apparatus of the present invention comprises: an optical unit for guiding one laser beam to the optical disk;
Detecting means for detecting a wobble, and a synchronizing signal generating circuit for detecting a time point at which the wobble waveform detected by the detecting means crosses the base axis from bottom to top and generating a synchronizing signal for a reproduction signal. It is characterized by the following. Also, the optical disc device of the present invention, a correction signal generating circuit for generating a correction signal that corrects the phase and amplitude of the wobble provided on the groove wall based on the correction amount reproduced by the optical means, A subtractor for subtracting the correction signal generated by the correction signal generation circuit from the reproduction signal.

Also, the optical disk apparatus of the present invention has a correction amount generating circuit for determining a range of the correction amount to be changed based on the correction amount reproduced by the optical means, and each correction amount determined by the correction signal generating circuit. A subtracter for subtracting the amount from the reproduction signal, and a reproduction signal from the subtractor, and an error rate for each correction amount is detected, and further, an error rate for detecting a reproduction signal for the correction amount at which the error rate is minimized. And a detection circuit.

Also, the optical disk apparatus of the present invention has a waveform memory for storing a reproduction signal obtained by reproducing a signal of a predetermined format recorded in the specific area, a reproduction signal input to one terminal, and an input of the reproduction signal. And a subtracter for inputting a reproduction signal of the signal of the predetermined format from the waveform memory to the other terminal in synchronization with the other terminal and subtracting a reproduction signal of the signal of the predetermined format from the reproduction signal.

Further, the present invention relates to an optical disc recording / reproducing apparatus for recording / reproducing an optical disc on which an address information block and a data information block are formed by wobbling a groove, an A / D converter for A / D converting a reproduced signal,
A synchronous detection circuit that receives a signal from the A / D converter and detects a signal corresponding to one wavelength of a wobble provided in the groove; and a reproduction signal that adds a predetermined number of signals from the synchronous detection circuit. Adder for averaging, a waveform memory for storing a reproduced signal averaged by the adder, and a reproduced signal from the A / D converter and an averaged reproduced signal from the waveform memory. And a subtracter for subtracting the averaged reproduction signal from the reproduction signal.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. <First Embodiment> Referring to FIG. 1, an optical disc includes a wobble 172 and a land and groove address portion 170.
This is an optical disc in which a wobble 174 is formed in a data area 171 following the address section 170. Here, the wobble 172 and the wobble 173 have different waveforms. The wobbles 172, 173 and 174 are formed on the walls on both sides of the groove. In the optical disc shown in FIG. 1, two different addresses are recorded in the address section 170, and the wobble 172 is a land address.
The wobble 173 is a groove address. At the time of reproduction, a laser beam reproduces the wobble 172 or the wobble 173 to detect a land or groove address. Thereafter, the laser beam reproduces data in the data area 171 and reproduces the wobble 174, and generates a synchronization signal of a reproduction signal from the detected wobble waveform. That is, referring to FIG. 2, each time point 1761, 1762,... Where the detected wobble waveform 175 crosses from the bottom to the top in relation to the base axis.
.. 176n generate synchronization signals D1, D2,..., Dn. Accordingly, the optical disc shown in FIG. 1 has a feature that the synchronization signal of the reproduction signal can be generated without forming the fine clock mark for generating the synchronization signal with a special wobble different from the wobble formed on the track. . In the optical disc according to the present invention, each of the time points 1761, 1762,.
2n, the wobble frequency is set so as to be in the range of 20 to 30 μm. Each time point 1761, 176
176n were changed to 20 μm and the amplitude of the wobble 174 was changed to 30, 40, and 60 nm, and the CN ratio and jitter of the reproduced signal were measured. As a result, as shown in FIG.
As the amplitude of the wobble 174 increases to 30, 40, 60 nm, the CN ratio of the reproduced signal improves, and the jitter decreases. The respective time points 1761, 1762,... 17
Similar results were obtained when the intervals of 6n were changed to 25 and 30 μm.

FIG. 4 shows an optical disk according to the present invention.
May be used. The address portion of the optical disk shown in FIG. 4 is obtained by superimposing a wobble 200 indicating an address on the wobble 174 in FIG. Although two addresses are recorded in the address section 170 of the optical disc shown in FIG. 1, one address is formed by the wobble 200 in the address section 170 of the optical disc shown in FIG. Is formed only on one of the walls. In this optical disk, the wobble 200 is reproduced by a laser beam, and the detected address is used as an address for a land and a groove on both sides. Also in this optical disk, the synchronization signal for the reproduction signal is generated in the same manner as in the optical disk of FIG. 1, and the frequency of the wobble provided in the data area for generating the synchronization signal is also the same.

Further, the optical disk in the present invention may be the optical disk shown in FIG. In the optical disc shown in FIG. 5, the wobble 174 formed in the data area is not formed in the address section 170, and only the wobble 210 is formed in only one of the grooves. Also in this optical disc, an address detected by reproducing the wobble 210 with a laser beam is a land on both sides,
And a groove address. Also,
Also in this optical disk, the synchronization signal for the reproduction signal is generated in the same manner as in the optical disk of FIG. 1, and the frequency of the wobble provided in the data area for generating the synchronization signal is also the same.

Still further, the optical disk according to the present invention comprises:
The optical disk shown in FIGS. 6 and 7 may be used. The optical disk shown in FIGS. 6 and 7 is the same as the optical disk shown in FIG.
Reference numeral 4 denotes a structure formed on one wall of the groove. Also in these optical disks, the synchronization signal for the reproduction signal is generated in the same manner as in the optical disk of FIG. 1, and the frequency of the wobble provided in the data area for generating the synchronization signal is also the same.

Referring to FIG. 8, FIG. 1, FIG. 4, FIG.
The playback device for the optical disc shown in FIGS. 6 and 7 will be described. Each area A, B,
The signals detected at C and D are the sum of A and D [A +
D] and the sum [B + C] of B and C are introduced into the differential amplifier 241, and [A + D] − [B + C] is calculated. afterwards,
[A + D]-[B + C] is a low-pass filter 24 that cuts high frequencies to generate a tracking error signal.
2. It is sent to a wobble detection bandpass filter 243 and an address demodulation bandpass filter 244. The band pass filter 244 demodulates an address from a reproduced signal obtained by detecting a wobble provided in the address section. The bandpass filter 243
In the reproduction signal, the high frequency band and the low frequency band of the reproduced signal are cut and sent to the comparator 245. In the comparator 245, the wobble waveform obtained by detecting the wobble 174 provided in the data area is used as a base axis from bottom to top. Is detected, and the result is sent to the PLL circuit 246. The PLL circuit 246 generates a synchronizing signal for a reproduction signal based on the point in time when the signal is sent. The generated synchronization signal is sent to a disk rotation control circuit and a data clock generation circuit.

Referring to FIG. 9, the details of the disk including the address section 170 and the data area 174 will be described. One track (one round) of the disk is divided into Nf frames. One frame is represented by a size of 2720 bytes, and is divided into a 96-byte address portion and a 2,624-byte data portion. The magneto-optical signal is mainly recorded in the data portion using NRZI modulation or (1-7) modulation.
Or it is reproduced. In this case, if the bit density of data to be recorded is 0.22 μm / bit, the length per frame is 4.77872 mm, 0.20 μm / bit.
Then, it becomes 4.352 mm. Therefore, in the case of a disc having a size of 12 cm, which is the same as a compact disc (CD), the number of frames Nf per track round is about 30 to 87. Next, assuming that the address portion has a length of 96 bytes and the minimum one wobble period of the address portion is one byte, the length on the disk of one wobble period is 1.
The range is 60 to 1.76 μm. Also, 4 bytes each for preamble 1 (PA1) and preamble 2 (PA2), address 1 (Address 1), and address 2 (A
address2), 2 bytes for the address mark (AM), preamble 3 (PA3) and sp
ace is given the length on disk of 1 byte each. In this case, as shown in FIG. 10, the actual data length is 4 bits for PA1 and PA2, and Address1 and A2.
address2 is 42 bits, AM is 2 bits, PA
3, one bit is assigned to the space.

Next, the data area has a length of 2624 bytes, PA4 has 24 bytes, and the data area has 2 bytes.
592 bytes and PA5 are composed of 8 bytes. The data area of 2592 bytes contains 2048 user data.
The byte, the DC component suppression data of the recording signal is composed of 32 bytes, or data for error correction. In this case, if one cycle of the wobble for generating a synchronization signal for recording and reproducing data is given a length of 16 bytes, the length of one wobble on the disc is 0.22 μm / bit density. 28.16 μm for bit,
In the case of 0.20 μm / bit, it is 25.6 μm. Then, 164 wobbles exist in the data portion in one frame. Therefore, 6 tracks in one track
Assuming that there are 0 frames and the disk rotates at 1500 rpm, the wobble frequency is 255 kHz.
Becomes A data synchronization signal for recording and / or reproducing data using the frequency of the wobble
Generated by This is because, as shown in FIG. 11, when NRZI is used as the data modulation method, the data synchronization signal is 32.64 MHz, and the PLL frequency divider 27
The ratio of 1 becomes 1/128. Also, the length of one wobble is not limited to 16 bytes, but is a length equivalent to a certain byte,
For example, a length of 4 bytes, or 8 bytes, or 20 bytes can be provided. In this case, the frequency of the wobble is set earlier or later than the previous 255 kHz, and the frequency of the PLL that generates the synchronization signal is different. In the present embodiment, it is preferable that the period length of one wobble be in the range of 5 to 50 μm.

Signal to No of wobble signal
In order to secure the issue ratio, it is preferable that the amplitude of the wobble is large. On the other hand, if the amplitude is large, in the case of a magneto-optical disk, the wobble frequency leaks into the magneto-optical signal, which has an adverse effect. FIG. 12 shows the results of measuring the crosstalk amount of the wobble signal and the error rate of the magneto-optical disk signal. In order to obtain good error rate characteristics, the amount of crosstalk of the wobble signal needs to be -25 dB or less. On the other hand, FIG. 13 is an example in which the amount of wobble amplitude and the amount of crosstalk to a magneto-optical signal are examined.
When the ratio of the width of the groove to the land is approximately 1: 1, and the pitch of the groove is 1.0 to 1.28 μm, the signal to noise ratio of the wobble signal is secured and the signal of the magneto-optical disk is reproduced with high accuracy. For this purpose, it is necessary to give the wobble an amplitude of ± 10 to ± 60 nm. In particular, when the bit density is 0.15-
0.24 μm / bit, 1 wobble length is 10 to 32 μm
In the case of m, it is preferable that the value be such that the amplitude of the wobble is ± 10 to ± 40 nm.

In a phase change disk, a dye-based or metal-based write-once optical disk, one wobble length is 5-5.
A value within a range of 0 μm and a range of an amplitude amount within a range of ± 10 to ± 60 nm is preferable. Referring to FIG. 10, Address1, A
address2 is assigned 42 bits each,
The frame address is an ordered number in one round of the track. Therefore, on the format, a maximum of 256 frames (Nf) can be secured in one track. Track address is a serial number assigned to the track of the entire disk from the inner circumference or the outer circumference. Therefore, up to 65536 on the format
The number of tracks in a book can be secured. PA1, PA
2 and PA3 are Address1, Address
2 and the address mark are used as a preamble and a postamble for accurately detecting. The amplitude of the wobbles used to record these signals gives about the same amount. When the ratio of the width of the groove to the land is approximately 1: 1, and the pitch of the groove is 1.0 to 1.28 μm,
It is necessary that the amplitude is set to ± 15 to ± 150 nm. In particular, the Signal to No of the wobble signal
In order to secure the issue ratio and accurately detect the address mark, a value of ± 25 to ± 70 nm is preferable. Address1 and Address2 are
The data is recorded on the disk and reproduced by the same method as that described in the first and second embodiments. For this reason, in an odd-numbered groove and an even-numbered groove, wobbles of opposite phases are recorded as address marks. For this purpose, two bits are allocated, and (0, 1)
Or (1, 0) to identify whether it is odd or even. In order to perform this identification reliably, the ratio of the width of the groove to the land is approximately 1: 1 and the pitch of the groove is 1.0 to 1.28 μm.
In the case of m, it is necessary to give the wobble an amplitude of ± 30 to ± 150 nm. As the amplitude of the wobble, a value in the range of ± 60 to ± 120 nm is particularly preferable.

In this embodiment, the highest frequency of the wobble in the address portion has an 8-bit data length. This may be selected depending on the relationship with the recording density. When one wobble cycle is 1.2 μm or more, the error rate and margin of the address portion are improved, and the reproduction can be performed with high accuracy. On the other hand, if this cycle is lengthened, the format efficiency of data decreases, so the cycle length must be between 1.2 and 5 μm. The same result was obtained not only with a magneto-optical disk, but also with a phase-change disk, a dye-based or metal-based write-once optical disk. Also, P
A1 has a feature that the phases of adjacent grooves are synchronized and can be used as a substitute for a fine clock mark for offset correction of a tracking signal.

Here, the shape of the wobble on the disk near the address mark is as shown in FIG. A wobble for generating a synchronization signal is generated as a synchronization signal after an address mark and a space. Before the address mark, Address1, Address2, PA1, P
A2, PA3, etc. are formed. In the address mark portion, two bits are assigned to an odd-numbered groove and an even-numbered groove. (0,1) or (1,0) is formed as a wobble of the opposite phase. A
Address1 and Address2 are identified using an address mark. To ensure this identification, the ratio of the width of the groove to the land should be approximately 1: 1.
When the groove pitch is 1.0 to 1.28 μm, the amplitude of the wobble is preferably ± 30 to ± 150 nm. Further, a value of ± 60 to ± 120 nm is preferable.

Further, in the present embodiment, the highest frequency of the wobble in the address portion is given by an 8-bit data length. This may be selected depending on the relationship with the recording density. When one wobble cycle is 1.2 μm or more, the error rate and margin of the address portion are improved, and the reproduction can be performed with high accuracy. On the other hand, if this cycle is lengthened, the data format efficiency is reduced, so that the cycle length is 1.2 to 5 μm.
Need to be between. This is not limited to the magneto-optical disk, but similar results were obtained for a phase-change disk, a dye-based or metal-based write-once optical disk. Also,
In PA1, the phase of the adjacent groove is recorded, and the fourth
It can be used as a substitute for the fine clock mark for offset correction of the tracking signal described in the embodiment.

According to the present invention, the clock for generating the address data and the synchronizing signal of the data can be detected not from the pits but from the information recorded in all wobbles.
In an ISO 90 mm magneto-optical disk or the like, an address signal is recorded in a pit on the disk, and a track miscount may occur at the time of high-speed access or the like. However, according to the present invention, the amount of reflected light from the disk is almost constant, and miscounting can be prevented even during high-speed access.

According to the present invention, the address signal is recorded in the form of a wobble on the mini-disc.
That is, after the address signal is double-phase-modulated, the wobble is modulated by a signal subjected to frequency modulation and recorded. However, in this case, Signal to signal of the carrier frequency is used.
It is difficult to generate a synchronization signal for recording and reproducing data from a carrier frequency because the noise ratio is deteriorated and the bandwidth is increased because the address signal is recorded by frequency modulation. In the case of the present invention, the band of the band-pass filter for extracting the wobble frequency may be about the band only required to apply the PLL, and a narrow-band filter may be prepared. For this reason, even if the wobble amplitude is small and the CN ratio is slightly poor, the actual Signal to Noise Ratio
o gets better. Therefore, a PLL with little jitter can be applied, and a synchronizing signal for recording and reproducing data can be generated with high accuracy. Further, in this case, the amplitude of the wobble may be small, so that the wobble signal is less likely to leak into the signal of the magneto-optical disk.

Further, by separating the address portion from the recording portion of the data area, the clock for generating the address data and the synchronizing signal for the data can be detected not from the pit but from the information recorded in the wobble. In addition, adverse effects on the magneto-optical signal of address data and access performance can be eliminated. <Second Embodiment> A second embodiment will be described with reference to FIG. The optical disk shown in FIG. 15 is an optical disk in which a land and groove address section 310 is formed by a wobble 311, and a wobble 312 is formed in a data area 313 following the address section 310. The wobble 312 is formed on both sides of the groove, and the wobble 311 is formed on one of the walls of the groove. In the optical disc shown in FIG. 15, one address is recorded in the address section 310, and the wobble 311 serves as both a land address and a groove address. At the time of reproduction, a laser beam reproduces the wobble 311 and detects a land or groove address. Thereafter, the laser beam reproduces data in the data area 313 and reproduces the wobble 312, and generates a synchronization signal of a reproduction signal from the detected wobble waveform.

The optical disk according to the second embodiment may have the structure shown in FIG. The optical disc shown in FIG. 16 is characterized in that a wobble 321 for recording address information is superimposed on a wobble 322 of a data section 323 in an address section 320. In the optical disc shown in FIGS. 15 and 16, the wobble 31 formed in the address portion is used.
1, 321 is modulated with address information, and its wavelength is shorter than the wavelength of the wobbles 312, 322 formed in the data section.

Referring to FIG. 17, the address section 310
The details of the disc including the data area 313 will be described. One track (one round) of the disk is divided into Nf frames. One frame is represented by a size of 2688 bytes, and is divided into a 64-byte address part and a 2624-byte data part. The magneto-optical signal is recorded or reproduced mainly in the data section using NRZI modulation or (1-7) modulation. In this case, assuming that the bit density of the data to be recorded is 0.22 μm / bit, the length per frame is 4.73088 mm, 0.20 μm / bit.
If it is bit, it will be 4.3008 mm. Therefore, in the case of a disk having a size of 12 cm, which is the same as a compact disk (CD), the number of frames Nf per round of the track is 3
It is about 0 to 87.

Next, assuming that the address portion has a length of 64 bytes and the minimum one wobble period of the address portion is one byte, the length of the one wobble period on the disk is 1.60.
範 囲 1.76 μm. Also, preamble 1
(PA1) 8 bytes, address 48 bytes, address mark (AM) 2 bytes, preamble 2 (PA
Give 2) the length on disk of 4 bytes and space 2 bytes. In this case, as shown in FIG. 18, the actual data length is assigned to 8 bits and 4 bits for PA1 and PA2, 48 bits for Address, 2 bits for AM, and 2 bits for space.

Next, the data area has a length of 2624 bytes, PA3 has 24 bytes, and the data area has 2 bytes.
592 bytes and PA4 are composed of 8 bytes. The data area of 2592 bytes contains 2048 user data.
The byte, the DC component suppression data of the recording signal is composed of 32 bytes, or data for error correction. In this case, if one cycle of the wobble for generating a synchronization signal for recording and reproducing data is given a length of 16 bytes, the length of one wobble on the disc is 0.22 μm / bit density. 28.16 μm for bit,
In the case of 0.20 μm / bit, it is 25.6 μm. Then, 164 wobbles exist in the data portion in one frame. Therefore, 6 tracks in one track
If there are 0 frames and the disk rotates at 1500 rpm, the frequency of the wobble is 252 kHz.
Becomes A data synchronization signal for recording and / or reproducing data using the frequency of the wobble
Generated by This is because, as shown in FIG. 11, when NRZI is used as the data modulation method, the data synchronization signal is 32.256 MHz, and the PLL frequency divider 2
The ratio of 71 becomes 1/128. Further, the length of one wobble is not limited to 16 bytes, but is a length equivalent to a fixed byte, for example, 4 bytes, 8 bytes, or 2 bytes.
A length of 0 bytes can be given. in this case,
The frequency of the wobble is set earlier or later than that of 252 kHz, and the frequency of the PLL that generates the synchronization signal is different. In the present embodiment, it is preferable that the period length of one wobble be in the range of 5 to 50 μm. Wobble signal Signal to Noise Ratio
In order to secure the wobble, it is better that the wobble amplitude is large. On the other hand, if the amplitude is large, in the case of a magneto-optical disc,
The wobble frequency leaks into the magneto-optical signal and has an adverse effect. This is the same as described with reference to FIGS. That is, the ratio of the width of the groove to the land is approximately 1: 1.
When the pitch of the groove is 1.0 to 1.28 μm, the signal to noise of the wobble signal is
In order to secure the io and to reproduce the signal of the magneto-optical disk with high accuracy, the wobble should be ± 10 nm to ± 60 nm.
Needs to be given. In particular, when the bit density is 0.15 to 0.24 μm / bit and one wobble length is 1
In the case of 0 to 32 μm, the wobble amplitude is ± 10 ± 4
A value that becomes 0 nm is preferable. On the other hand, in a phase change disc, a dye-based or metal-based write-once optical disc,
The length of one wobble is in the range of 5 to 50 μm, and the amplitude is ± 10.
Values in the range ± 60 nm are preferred.

Referring to FIG. 18, the address includes
48 bits are allocated and the Frame address
Is a numbered sequence in one round of the track. Therefore,
In the format, a maximum of 1024 frames (Nf) can be secured in one track. The encoding method of the data of the address information is not limited to the bi-phase encoding method, and Manchester code, NRZ, NRZI code, Manchester code, and the like are used. Track a
“ddress” is a serial number assigned to the track of the entire disc from the inner circumference or the outer circumference. In this case, the land portion L2n and the groove portion G2n are given by the same address GA2n. Therefore, up to 104
8576 tracks can be secured. PA
1 and PA2 are used as preambles and postambles for accurately detecting Addresses and address marks. The amplitude of the wobbles used to record these signals gives about the same amount. When the ratio of the width of the groove to the land is approximately 1: 1, and the pitch of the groove is 1.0 to 1.28 μm, the amplitude is ± 15.
±± 150 nm is required. In particular, in order to secure the signal to noise ratio of the wobble signal and accurately detect the address mark, a value of ± 25 to ± 90 nm is preferable. The address mark is used as a start signal for identifying an address portion and for recording and reproducing a signal. Then, in order to perform this identification reliably, the ratio of the width of the groove to the land is approximately 1: 1.
When the groove pitch is 1.0 to 1.28 μm, it is necessary to give the wobble an amplitude of ± 30 to ± 200 nm. The amplitude of the wobble is particularly ± 60 to ± 150.
Values in the nm range are preferred. In the present embodiment,
The highest frequency of the wobble in the address portion provided an 8-bit data length. This may be selected depending on the relationship with the recording density. When one wobble cycle is 1.2 μm or more, the error rate and margin of the address portion are improved, and the reproduction can be performed with high accuracy. On the other hand, if this cycle is lengthened, the format efficiency of data decreases, so the cycle length must be between 1.2 and 5 μm. The same result was obtained not only with a magneto-optical disk, but also with a phase-change disk, a dye-based or metal-based write-once optical disk.

In the present embodiment, the highest frequency of the wobble in the address portion is given by an 8-bit data length. This may be selected depending on the relationship with the recording density. When one wobble cycle is 1.2 μm or more, the error rate and margin of the address portion are improved, and the reproduction can be performed with high accuracy. On the other hand, if this cycle is lengthened, the data format efficiency is reduced, so that the cycle length is 1.2 to 5 μm.
Need to be between. This is not limited to the magneto-optical disk, but similar results were obtained for a phase-change disk, a dye-based or metal-based write-once optical disk.

According to the present embodiment, it is only necessary to provide one address in the groove as compared with the embodiment based on FIG. 1, so that the format efficiency can be further improved. In the above description, although the presence or absence of an address mark provided after the address portion is not described, the address mark may be provided or the address mark may not be provided. When an address mark is provided, the amplitude of the address mark is the same as that described in the fifth embodiment.

<Third Embodiment> In the data area 171 in the first embodiment or the data areas 313 and 323 in the second embodiment, wobbles of a predetermined cycle are provided on both sides or one of the grooves. Structure. When a magneto-optical disk having such a structure is reproduced, there is a problem that the polarization direction of the reflected light of the laser beam irradiated by the wobble provided in the groove is affected, and the recorded signal cannot be reproduced accurately. Referring to FIG.
Further details will be described. In the structure of the magneto-optical disk shown in FIG. 19, wobbles 351 provided on both sides of the groove are provided.
Have the same phase, when the laser beam 352 is applied to the groove G, the reflected light is not a polarized wave based on the original magnetization of the signal, but the wobbles 351 and 351 provided on both sides of the groove G. Has the polarization wave component in the same direction as the arrow 353 indicating the direction of the groove determined by the above. When irradiated with the laser beam 354, the laser beam 354 has a polarized wave component in the same direction as the arrow 355 indicating the direction of the groove G at that position. Therefore, in the structure shown in FIG. 19, a polarized wave component due to the effects of the wobbles 351 and 351 provided on both sides of the groove G appears in the component of the reproduced signal of the originally recorded signal, thereby deteriorating the reproduction characteristics. There is a problem that a recording signal cannot be detected accurately. This problem also occurs when a wobble is provided in one of the grooves G. Hereinafter, the ratio of the polarization wave component due to the influence of the wobble to the reproduction signal component is defined as the leakage amount.

Therefore, the third embodiment aims to solve the above-mentioned problem and to provide a magneto-optical disk in which wobbles provided on both sides of the groove G do not affect the reproduction characteristics. The third embodiment will be described with reference to FIG. FIG. 20 shows a wobble structure provided on both walls of the groove in the data area. On both sides of the groove G, wobbles 3 of a predetermined wavelength W and amplitude h
61 are formed in the same phase. The seventh embodiment is characterized in that the wavelength W and the amplitude h of the wobble 361 are set so that the leakage amount is -25 dB or less and the error rate is 1 × 10 ^-4 or less.

FIG. 21 shows the wavelength W of the wobble 361 as 0.5.
It shows the leakage amount when the amplitude h is changed in the range of ± 3 to ± 0 nm and the amplitude h in the range of ± 3 to ± 0 nm. According to FIG. 21, when the wavelength W of the wobble 361 is in the range of 0.5 to 10 μm and the amplitude h is in the range of 3 to 25 nm, the leakage amount is −25 dB or less. FIG. 22 shows the wavelength W of the wobble 361 as 0.5.
10 shows an error rate when the amplitude h is changed in a range of ± 3 to ± 50 nm and the amplitude h is changed in a range of ± 3 to ± 50 nm. As in the fifth embodiment, a synchronous signal is generated from a reproduced signal obtained by reproducing the wobble 361 and recorded and reproduced. In this case, the division ratio of the synchronization signal generation circuit is 1/3
The synchronization signal length is 0.15 to 0.16.
26 μm. According to FIG. 22, the error rate is 1 × 10 ⁻⁴ or less when the wavelength W of the wobble 361 is in the range of 0.8 to 10 μm and the amplitude h is in the range of 5 to 25 nm. Amplitude h is ±
Above 25 nm, the amount of leakage is large and the error rate deteriorates, and below ± 5 nm, the error rate deteriorates because the characteristics of the synchronization signal obtained from the wobble reproduction signal deteriorate. Here, the wavelength W of the wobble 361 is preferably in the range of 1.2 to 5.0 μm, more preferably 1.6 to 5.0 μm.
It is in the range of 3.0 μm.

Accordingly, from the results shown in FIGS. 21 and 22, the leakage amount is -25 dB or less and the error rate is 1 ×
The range of the wavelength W and the amplitude h of the wobble 361 capable of realizing 10 ⁻⁴ or less are in the range of 0.8 to 10 μm and ± 5, respectively.
±± 25 nm. The wavelength W of this wobble
The values h and h are values that can be applied even when a wobble is provided on one of the walls of the groove G. In the third embodiment, the wobbling cycle of the address information block is in the range of 1.60 to 2.0 μm.

Although the structure of the groove G in the data area has been described in the third embodiment, the other parts such as the address area are the same as those in the first and second embodiments. Description is omitted. In this embodiment, a lower error rate can be obtained because the synchronization signal can be generated with higher accuracy than in the first and second embodiments.

<Fourth Embodiment> In the third embodiment, the polarization direction of the reflected light of the laser beam irradiated by the in-phase wobbles provided on the walls on both sides of the groove is affected, and the reproduction characteristics are affected. Leakage occurs due to this effect. In the fourth embodiment, a method for eliminating this leakage will be described.

Referring to FIG. 23, FIG. 24 and FIG.
Will be described. In the magneto-optical recording medium 39 according to the present invention, the TOC area is provided on the inner peripheral portion 392 and the outer peripheral portion 391. In the first erasing method, both TOC regions provided on the inner peripheral portion 392 and the outer peripheral portion 391 are provided.
Alternatively, information on the amount of leakage is recorded in one of them, and this information is detected at the time of reproduction, thereby eliminating the leakage from the reproduced signal. FIG.
Reference numeral 4 denotes a circuit configuration for eliminating leakage.
After a reproduction signal is input to a terminal 40 and noise is removed by a band-pass filter (BPF) 41, the PLL circuit 4
2 and sent to the correction signal generation circuit 44. PLL circuit 42
25A, a signal having a wobble waveform provided on both sides of the groove shown in FIG. 25A is sent. The PLL circuit 42 detects a synchronization signal from the wobble waveform shown in FIG. The signal is sent to the omitted laser drive circuit and decoder, and the signal is reproduced in synchronization with the synchronization signal. The correction signal generation circuit 44 adjusts the phase and amplitude of the signal (a) to the wobble of the signal (b) based on the information regarding the leakage amount recorded in the TOC area of the magneto-optical recording medium 39 input from the terminal 45. The waveform is corrected so as to be equal to the phase and amplitude of the waveform, and sent to the subtractor 47. Also, from the terminal 46,
The magneto-optical reproduction signal on which the wobble waveform shown in (b) is superimposed is input to the subtractor 47. The subtracter 47 performs an operation of subtracting the corrected waveform of the signal (a) from the waveform of the signal (b) to generate a signal (c). The generated signal (c) is sent to a decoder (not shown), and after a predetermined demodulation, is extracted as a reproduced signal. As a result, leakage into the reproduction signal due to the wobble is eliminated.

Referring to FIGS. 26 and 27, the second erasing method will be described. In the second erasing method, the correction amount to be changed is determined based on the correction amount recorded in the TOC area of the magneto-optical recording medium 39 shown in FIG. 23, and the error of the reproduced signal for each changed correction amount is determined. Detect rate. Thereafter, a correction amount at which the error rate is minimized is determined, and a signal corresponding to the determined correction amount is detected as a reproduction signal. FIG. 26 shows a circuit used in the second erasing method. The correction amount detected from the TOC area is input to the correction amount generation circuit 420, and the correction amount generation circuit 420
The range of the correction amount to be changed is determined based on the input correction amount and sent to the subtractor 422. On the other hand, the reproduction signal is input from the terminal 421 to the subtractor 422, and the subtracter 422 performs an operation of subtracting each correction amount determined from the reproduction signal, and as a result, sends the result to the error rate detection circuit 423. The error rate detection circuit 423 detects an error rate for each correction amount. Since the error rate for each correction amount has the relationship shown in FIG. 27, the error rate detection circuit 423 determines the correction amount that minimizes the error rate, and outputs a reproduction signal for the determined correction amount from the terminal 424. In this case, the range of the correction amount to be changed is 0.3 to 3 times the correction amount.

Referring to FIG. 28, FIG. 29 and FIG.
Will be described. Magneto-optical recording medium 440
Has a TOC region on the inner peripheral portion 392 and the outer peripheral portion 391,
In the signal recording area 445, areas (hereinafter, referred to as specific areas) 441 and 443 and information areas 442 and 444 in which information on a reproduction signal is recorded are formed as a set.
The specific areas 441 and 443 include [11111...
.], [00000 ...], [1010101 ...
.] Are recorded, and these signals are reproduced before reproducing the signals. These signals are equivalent to a reproduced signal in which no magneto-optical signal is recorded. That is, only the signal based on the wobble waveform is obtained. Therefore, by subtracting this signal from the reproduced signal, the amount of leakage can be eliminated. From the terminal 450, [11111 ...], [00000 ...],
The reproduced signal shown in FIG. 30D obtained by reproducing any one of [1010101...] Is input and stored in the waveform memory 451. On the other hand, the reproduction signal shown in (e) of FIG. 30 is input from the terminal 452 to the + terminal of the subtractor 453, and the signal of (d) is input from the waveform memory 451 to the-terminal of the subtractor 453 in synchronization with this. Is done. Subtractor 4
53 subtracts the input signals (d) and (e), obtains a signal (f) without leakage, and outputs the signal from a terminal 454. After that, it is sent to a decoder (not shown) and extracted as a reproduced signal. In this case, [11111
...], [00000 ...], [1010101
..], The leakage amount can be detected in the same manner even if the magnetization of the reproducing layer of the magneto-optical recording medium is aligned in one direction by an external magnetic field applying means such as a magnetic head.

Referring to FIGS. 31 and 32, a fourth erasing method will be described. The reproduction signal input to the terminal 470 is subjected to A / D conversion by the A / D converter 471,
75 and sent to the synchronous detection circuit. The synchronous detection circuit 472 detects a reproduced signal corresponding to one wavelength of the wobble waveform shown in FIG.
Send to The adder 473 converts the reproduced signal for one wavelength into 100
Add up to 10,000 times and average. The result is sent to the waveform memory 474. The reproduction signal after the A / D conversion is input to the + terminal of the subtractor 475, and in synchronization with this,-
The terminal receives an averaged signal from the waveform memory. The subtracter 475 can eliminate leakage by performing an operation of subtracting the averaged signal from the input reproduced signal.

Referring to FIG. 33, a fifth erasing method will be described. The waveform B of the signal (g) represents a signal of 4 bytes, and the waveform C of the signal (h) represents a signal of the next 4 bytes. Waveform A represents a wobble waveform having the same phase formed on both sides of the groove. In the fifth erasing method, the signal (i) is obtained by subtracting the waveform A from the waveform B of the signal (g). Further, the signal (j) is obtained by adding the waveform A to the waveform C of the signal (h). The amplitude of the waveform A is A1,
The amplitude of waveform B is B1, the amplitude of waveform C is C1, and signal (i)
Is Bh and the amplitude of the signal (j) is Ch,
(Ch-Bh) / 2 = [(C1 + A1)-(B1-A
1)] / 2 = A1, so that a reproduced signal from which the leakage amount has been eliminated can be obtained.

<Fifth Embodiment> In a fifth embodiment, still another modification of the optical disk according to the present invention will be described. With reference to FIG. 34, a planar structure of the optical disc in the fifth embodiment will be described. A wobble 50 is formed on one wall of the groove, and a wobble 51 is formed on a wall different from the wall on which the wobble 50 is formed.
Here, when the reproduction data rate is 24 MHz, the frequency of the wobble 51 is 3 MHz, and the frequency of the wobble 50 is 281.25 to 375 kHz.
In the fifth embodiment, the wobble 50 and the wobble 51 are formed over the entire area of the optical disc. In the wobble 50, address information is recorded by frequency modulation.

Referring to FIG. 35, an address format recorded on wobble 50 will be described. FIG. 35 shows an address format per sector. The address format is 4 bits as a synchronization pattern, 24 bits as a frame address, and R
4 bits as reserved and 12b as ECC
It is a format provided with “its”. In one sector,
Since the Data Area includes 2 kB, the address described above indicates an address for data of 2 kB. Also, the wobble 51 has data of 1 byte.
One for es and 2816 for one sector. This 2816 pieces / sector wobble 51
Is a reference for generating a recording / reproducing clock. Further, one wobble 51 may be formed for two bytes of data and 1408 wobbles may be formed for one sector.

Referring to FIG. 36, reproduction of an optical disk according to the ninth embodiment will be described. As the reproducing circuit, the reproducing circuit shown in FIG. 8 is used. When the groove 1 (G1) in FIG. 34 is reproduced by a laser beam, the reproduced signal is the signal shown in FIG.
This is because the wobble 50 is formed on one side of G1 and the wobble 51 is formed on the other side of G1, so that the signals from both wobbles are detected as a reproduction signal in a superimposed form. Next, when L1 in FIG. 34 is reproduced by a laser beam, wobble 51 is used on one side and wobble
Since 0 is formed, the reproduced signal is a signal shown in FIG. The same applies to the case where G2 and L2 in FIG. 34 are reproduced by a laser beam. Therefore, it is necessary to separate the obtained reproduced signal into a signal from the wobble 50 and a signal from the wobble 51.

Therefore, referring to FIG. 8, the signal (a) reproduced as a push-pull signal is sent to a BPF 243 as a narrow-band band-pass filter and a BPF 244 as a band-pass filter for address demodulation. BPF24
Only the high-frequency components of the reproduction signal sent to No. 3 are extracted, and the signal of FIG. This signal (c) is a signal corresponding to the wobble 51. BPF24
The signal (c) extracted in 3 is sent to the comparator 245. The comparator 245 binarizes the sent signal (c) and sends the binarized signal to the PLL 246. P
The LL 246 generates a data clock from the sent binary signal corresponding to the rising timing. The generated synchronization signal is sent to a disk rotation control circuit and a data clock generation circuit, and used for rotation control and clock generation. On the other hand, the BPF 244 extracts a low frequency component from the transmitted signal (a) and extracts a signal (b). The signal (b) is a signal corresponding to the wobble 50. The extracted signal (b) is sent to the FM demodulation circuit 53 shown in FIG. The synchronization signal generated by the PLL 246 is also sent to the clock distribution circuit 56, and the clock distribution circuit 56 performs clock distribution.
The signal is sent to the FM demodulation circuit 53, the Biphase demodulation circuit 54, and the address decoder circuit 55. FM demodulation circuit 53
Synchronizes the signal (b) sent from the BPF with the clock sent from the clock distribution circuit 56 to FM.
The signal is demodulated and sent to the biphase demodulation circuit 54. Biph
The case demodulation circuit 54 bi-phase-demodulates the FM-demodulated address signal in synchronization with the clock sent from the clock distribution circuit 56 and sends the signal to the address decoder circuit 55. The address decoder circuit 55 outputs an address in synchronization with the clock transmitted from the clock distribution circuit 56.

The optical disk shown in the fifth embodiment is an optical disk which can generate a synchronization signal with high precision from a wobble formed on one of the walls of a groove and has a small amount of leakage of a wobble into a reproduction signal. It is valid. However, in order to further improve the reproduction characteristics,
The erasing circuit for erasing leakage described in the fourth embodiment can be applied.

In the first to fifth embodiments, the present invention is not limited to the magneto-optical disk, but may be a phase change disk, a dye-based or metal-based write-once optical disk. In addition, the recording medium is not limited to an optical disk, and may be any recording medium. Further, if it is limited to a magneto-optical disk, it may be a magneto-optical disk in which magnetic domains of signals recorded on the recording layer are enlarged and transferred to the reproducing layer for reproduction.

[0052]

According to the present invention, it is not necessary to divide a laser beam of an optical pickup by a diffraction grating or the like, and only one laser beam spot is focused on a disk recording surface, thereby enabling addressing of a groove and a land. Can be detected.

According to the present invention, recording and reproduction can be performed while reading a wobble signal in both the groove and the land, so that recording can be performed at twice the density of a conventional optical disk. In addition, the number of optical components can be reduced, and the recording density of the disk can be sufficiently increased without impairing the power of the laser beam emitted from the laser light source.

According to the present invention, it is possible to record / reproduce a signal without offset by detecting a fine clock mark provided in the form of a wobble in a groove of an optical disk having a track composed of a land and a groove. Becomes Further, according to the present invention, the clock for generating the address data and the synchronizing signal of the data can be detected not from the pits but from the information recorded in the wobbles.

Further, according to the present invention, the address portion and the recording portion of the data area are separated from each other, and the clock for generating the address data and the synchronizing signal of the data is not pits but all information recorded in wobbles. By being able to detect, it is possible to eliminate adverse effects on a magneto-optical signal of address data and access performance. Further, according to the present invention, since both land and groove addresses can be used with one piece of address information, it is sufficient to record one address with wobbles, and the efficiency of format can be further promoted.

According to the present invention, the wobble provided in the data area has a wavelength of 0.8 to 10 μm and an amplitude of 5 to 25 μm.
By setting the range to nm, it is possible to realize a magneto-optical disk having a small amount of leakage and a small error rate. Further, according to the present invention, it is possible to eliminate the leakage of the reproduction signal due to the wobbles provided on the walls on both sides of the groove, and it is possible to obtain a reproduction signal having good characteristics.

According to the present invention, a low-frequency wobble is formed on one wall of the groove and a high-frequency wobble is formed on the other wall of the groove, so that the amount of leakage into the reproduced signal due to the influence of the wobble is reduced. In addition to this, the external synchronization signal can be generated with high accuracy. Further, the above effects can be obtained in a recording medium such as an optical recording medium and a magneto-optical recording medium.

Further, according to the present invention, since no wobble is formed on both sides of the groove in the area where the signal is recorded or reproduced, the polarization direction of the light reflected by the groove is affected by the wobble. It is possible to obtain a recording medium having good reproduction characteristics without any leakage that the influence appears in the reproduction characteristics. Further, according to the present invention, the area where the groove for generating the synchronizing signal is not provided is provided every 68 bytes, so that the synchronizing signal can be reliably generated, and the recording or reproduction of the signal can be performed. Characteristics can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a land / groove structure according to a first embodiment.

FIG. 2 is a diagram illustrating a method of generating a synchronization signal from a reproduced wobble waveform.

FIG. 3 is a diagram illustrating another land / groove structure according to the first embodiment.

FIG. 4 is a diagram showing still another land / groove structure in the first embodiment.

FIG. 5 is a diagram showing still another land / groove structure in the first embodiment.

FIG. 6 is a diagram showing still another land / groove structure in the first embodiment.

FIG. 7 is a diagram showing still another land / groove structure in the first embodiment.

FIG. 8 is a diagram illustrating processing of a reproduction signal from an optical disc in the first embodiment.

FIG. 9 is a diagram showing a disk format according to the first embodiment.

FIG. 10 is a diagram showing an address format in the first embodiment.

FIG. 11 is a diagram showing a device block for generating a synchronization signal from a wobble signal in the first embodiment.

FIG. 12 is a diagram illustrating a relationship between a crosstalk amount of a wobble signal and an error rate of a signal of a magneto-optical disk according to the first embodiment.

FIG. 13 is a diagram illustrating a relationship between crosstalk and a wobble length in the first embodiment.

FIG. 14 is a diagram illustrating an example of a wobble waveform provided in an address section, an address mark section, and a data area according to the first embodiment.

FIG. 15 is a diagram showing a land / groove structure according to the second embodiment.

FIG. 16 is a diagram showing another land / groove structure according to the second embodiment.

FIG. 17 is a diagram showing a disk format according to the second embodiment.

FIG. 18 is a diagram showing an address format according to the second embodiment.

FIG. 19 is a diagram for explaining that wobbles provided on both sides of a groove adversely affect a reproduced signal component.

FIG. 20 is a diagram illustrating a wobble structure according to the third embodiment.

FIG. 21 is a table showing a relationship between a wobble wavelength, an amplitude h, and a leakage amount according to the third embodiment.

FIG. 22 is a table showing a relationship between a wobble wavelength and amplitude h and an error rate according to the third embodiment.

FIG. 23 is a diagram illustrating a planar structure of a magneto-optical recording medium according to a fourth embodiment.

FIG. 24 is a block diagram of an erase circuit according to a first erase method according to the fourth embodiment.

FIG. 25 is a diagram illustrating signals according to a first erasing method according to the fourth embodiment.

FIG. 26 is a diagram illustrating an erase circuit according to a second erase method according to the fourth embodiment.

FIG. 27 is a diagram illustrating a relationship between an error rate of a reproduction signal and a correction amount according to a second erasing method according to the fourth embodiment.

FIG. 28 is a diagram illustrating another planar structure of the magneto-optical recording medium according to the fourth embodiment.

FIG. 29 is a block diagram of an erase circuit according to a third erase method in the fourth embodiment.

FIG. 30 is a diagram showing signals according to a third erasing method in the fourth embodiment.

FIG. 31 is a block diagram of an erase circuit according to a fourth erase method in the fourth embodiment.

FIG. 32 is a diagram illustrating signals according to a fourth erasing method according to the fourth embodiment.

FIG. 33 is a diagram illustrating signals for explaining signal processing according to a fifth erasing method in the fourth embodiment.

FIG. 34 is a diagram showing a planar structure of an optical disc in a fifth embodiment.

FIG. 35 is a diagram illustrating an address format recorded on an optical disc according to the fifth embodiment.

FIG. 36 is a diagram illustrating a wobble reproduction signal according to the fifth embodiment.

FIG. 37 is a circuit diagram illustrating reproduction of address information according to the fifth embodiment.

FIG. 38 is a diagram showing a tracking control method and an address detection method for recording and reproducing lands and grooves using three beams according to a conventional method.

[Explanation of symbols]

 170 Address section 171 Data area 172 Wobble 420 Correction amount generation circuit 423 Error rate detection circuit 441, 443 Specific area 442, 444 Signal area 445 Signal recording area 451, 474 Waveform memory 471 A / D converter 472 Synchronous detection circuit 473 Adder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) G11B 20/18 520 G11B 20/18 520E (31) Priority claim number Japanese Patent Application No. 8-301426 (32) Priority Date November 13, 1996 (November 13, 1996) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-6988 (32) Priority date January 17, 1997 Date (Jan. 17, 1997) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-12790 (32) Priority date January 27, 1997 (Jan. 27, 1997) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-25655 (32) Priority date February 7, 1997 (1997.2.7) (33) Priority claim Country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-56681 (32) Priority date March 11, 1997 (March 11, 1997) (33) Priority claim country This (JP) (31) Priority claim number Japanese Patent Application No. 9-95700 (32) Priority date April 14, 1997 (April 14, 1997) (33) Priority claim country Japan (JP) (31) Priority claim number 9-106368 (32) Priority date April 23, 1997 (April 23, 1997) (33) Priority claim country Japan (JP) (31) Priority claim number 9-109436 (32) Priority date April 25, 1997 (April 25, 1997) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-140087 (32) Priority Date May 29, 1997 (May 29, 1997) (33) Priority Country Japan (JP) (72) Noboru Mamiya 2-5-5 Keihanhondori, Moriguchi-shi, Osaka SANYO Electric Co., Ltd. Within the company (72) Koji Uchihara 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Satoshi Sumi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka (72) Inventor Kenji Nakao 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. Inside the company (72) Inventor Toshiaki Hioki 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Hisashi Matsuyama 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Inside Electric Co., Ltd. (72) Inventor Yoshihiro Hori 2-5-1, Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (10)

[Claims] 1. An optical disc in which at least one wall of a groove is wobbled in the width direction of the groove to form an address information block and an address information block, wherein the address information block is formed by a first wobble, and the data information block is Is an optical disc formed of a second wobble having a longer wavelength than the wavelength of the first wobble. 2. An optical disk capable of recording and / or reproducing information on and from a land and a groove, wherein a wobble having a fixed wavelength is continuously formed on the groove, and a wobble modulated by address information is formed on one wall of the groove. An optical disc formed intermittently at predetermined intervals. 3. The data information block according to claim 1, wherein a wobbling cycle of the data information block is in a range of 0.8 to 10 μm, and a wobbling amplitude of the data information block is in a range of 5 to 25 nm. 2. The optical disk according to item 2. 4. The method according to claim 1, further comprising: setting a TOC area including information on a correction amount for eliminating leakage of a reproduction signal to an inner peripheral portion or / and / or
4. The optical disk according to claim 1, wherein the optical disk is provided on an outer peripheral portion of the optical disk. 5. A method according to claim 1, further comprising providing a specific area in which a signal of a predetermined format equal to the reproduction signal from which the magneto-optical signal has been erased is recorded, and a signal area in which a signal is recorded following the specific area. The optical disk according to claim 1, wherein the optical disk is an optical disk. 6. An optical disk device for recording and reproducing an optical disk according to claim 1, wherein: an optical unit for guiding one laser beam to the optical disk; a detecting unit for detecting the second wobble; An optical disc device, comprising: a synchronization signal generation circuit that detects a time point at which the wobble waveform detected by the detection means crosses the base axis from bottom to top and generates a synchronization signal for a reproduction signal. 7. An optical disk apparatus for recording and reproducing an optical disk according to claim 4, wherein a phase and an amplitude of a wobble provided on the groove wall are corrected based on the correction amount reproduced by an optical unit. An optical disc device comprising: a correction signal generation circuit for generating a corrected signal; and a subtracter for subtracting a correction signal generated by the correction signal generation circuit from a reproduction signal. 8. An optical disk apparatus for recording and reproducing an optical disk according to claim 4, wherein a correction amount generating circuit for determining a range of a correction amount to be changed based on the correction amount reproduced by an optical means; A subtractor for subtracting each correction amount determined by the correction signal generation circuit from the reproduction signal; and inputting the reproduction signal from the subtractor to detect an error rate for each correction amount. An optical disk device comprising: an error rate detection circuit that detects a reproduction signal for a correction amount. 9. An optical disk apparatus for recording and reproducing an optical disk according to claim 5, wherein one of a waveform memory for storing a reproduction signal obtained by reproducing a signal of a predetermined format recorded in the specific area; And a subtraction for inputting a reproduction signal of the signal of the predetermined format from the waveform memory to the other terminal in synchronization with the input of the reproduction signal and subtracting a reproduction signal of the signal of the predetermined format from the reproduction signal. An optical disc device comprising: 10. An optical disk recording / reproducing apparatus for recording / reproducing an optical disk on which an address information block and a data information block are formed by wobbling a groove, comprising: an A / D converter for A / D converting a reproduction signal; A synchronous detection circuit for receiving a signal from a device and detecting a signal corresponding to one wavelength of a wobble provided in the groove; and an addition for averaging a reproduced signal by adding the signal from the synchronous detection circuit a predetermined number of times. A waveform memory for storing a reproduction signal averaged by the adder; a reproduction signal from the A / D converter and an averaged reproduction signal from the waveform memory; An optical disc device, comprising: a subtracter for subtracting an averaged reproduction signal from the data.