JPH1145441A - Recording medium and information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To read out address information recorded as the waveform of a groove at the time of the recording and the reproducing of not only a groove but also a land with only one laser beam by making a recording medium a recording medium including the address information in the groove or the land. SOLUTION: A laser beam is controlled so as to form a beam spot at the center of a groove while reading addresses being on a disk. When in a state in which the beam spot is controlled so as to become the center of a land, a tracking error signal is inverted in an invertible amplifier and it is inputted to a servo circuit by being selected in a tracking polarity changing over switch, the beam spot is controlled to become the center of the land. Moreover, address marks provided in order to judge which of first and second address information indicate an address with which a recording or a reproduction is performed at present function easily by making them a prescribed pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium such as an optical disk having a waveform pregroove, and more particularly to a recording medium and a recording / reproducing apparatus suitable for a recording / reproducing apparatus for a recordable CD disk and a recordable magneto-optical disk. About.

[0002]

2. Description of the Related Art In a mini disk, a groove having a waveform shape of a signal obtained by FM-modulating a carrier serving as a rotation synchronizing signal with address information is engraved, and is used for rotation control and detection of address information. This method is generally called a wobbling method. Also, a wobbling method has been proposed for an optical disc apparatus in which recording is performed on a groove and a land between the grooves on an optical disc in which 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 formed. ing. 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 a main beam and two sub beams by a diffraction grating.
As shown in FIG. 5, when the main beam is track-controlled at the center of the groove, address information is read from the push-pull signal from the main beam, and when the main beam is controlled at the center of the land, as shown in FIG. ,
A method for reading address information from a push-pull signal from a sub-beam (Japanese Patent Laid-Open No. 7-14172) is known.

[0003]

In the above-mentioned conventional optical disk, the total length of the track for recording on the groove and the land is twice as long as that on the groove alone. However, since only the groove has address information, the laser beam emitted from the laser light source of the optical pickup is divided into the main beam and the two sub-beams.
Optical components such as a diffraction grating for splitting into 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.

[0004] The present invention has been made in view of the above points, and an object of the present invention is not only to record address information recorded as a groove waveform, but also to use a
It enables reading with only one laser beam even when recording / reproducing lands. This reduces the number of optical components and ensures that the recording density of the disc is sufficient 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.

[0005]

According to the present invention, there is provided a recording medium including address information in a groove or a land. Further, the present invention is characterized in that the optical recording medium includes address information in a groove or a land.

The present invention is also characterized in that the groove or the land is a magneto-optical recording medium containing address information. Further, the present invention is characterized in that it is a magneto-optical recording medium by expanding a magnetic domain including address information in a groove or a land. Further, the present invention is characterized in that the address information includes information for a groove and information for a land.

Further, the present invention is characterized in that the groove address and the land address are formed continuously. Further, the present invention is characterized in that the address information is recorded in a groove. Further, the present invention is characterized in that one address is common to address information of an adjacent groove.

Further, the present invention is characterized by including an address mark for identifying a groove address and a land address. Further, the present invention is characterized in that the address mark is formed following the groove and land addresses. Further, the present invention is characterized in that the recording medium is a recording medium on which address information is recorded as wobbles.

According to the present invention, in an optical disc capable of recording and / or reproducing data on and from a land and a groove, the groove includes first address information formed as a wobble, and the land includes grooves located on both sides of the land. Are provided with second address information having the same waveform.

Further, the present invention is characterized in that in an optical disk capable of recording and / or reproducing data on and from lands and grooves, adjacent grooves include wobbles having the same waveform. Further, according to the present invention, in an optical disk capable of recording and / or reproducing information on and from a land and a groove, the groove includes first address information formed as a wobble, and the land is provided on the groove located on both sides of the land. The wobble includes second address information having the same waveform, and the wobble is also provided in a data recording area of a groove or a land.

According to the present invention, in an optical disc capable of recording and / or reproducing data on and from a land and a groove, the groove includes first address information formed as a wobble and a TOC formed as a wobble or a pit array.
Wherein the land includes second address information in which wobbles provided on grooves located on both sides of the land have the same waveform, and TOC information formed as a pit row.

Further, according to the present invention, in an optical disk capable of recording and / or reproducing data on and from a land and a groove, the groove is composed of first address information formed as wobbles and TOC formed as wobbles or pit strings.
The land includes second address information in which wobbles provided on grooves located on both sides of the land have the same waveform, and TOC information formed as a pit row. The wobble is also provided in the area.

In the present invention, the frequency of the wobble is 20
The frequency range is from 0 kHz to 10 MHz.
Further, the invention is characterized in that the width of the groove is the same as the width of the land. Further, the present invention is characterized in that the grooves include fine clock marks at predetermined intervals.

Further, the present invention is characterized in that the fine clock mark is provided as a wobble.
Further, the present invention is characterized in that the predetermined interval is in a range of 50 to 300 μm. Also, the present invention provides an optical disc capable of recording and / or reproducing on and from a land and a groove, wherein a wobble is provided on one of the walls of the groove,
Another wobble for a fine clock mark is provided on at least one wall of the groove.

Further, 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 including address information for the land and the groove is provided on one of the walls of the groove, and the wobble including the address information is provided. In a region other than the region provided with, another wobble for a fine clock mark is provided on at least one wall of the groove.

Further, the present invention is characterized in that wobbles for fine clock marks are provided at intervals of 50 to 300 μm. Further, the present invention is characterized in that the ratio of the wobble interval for the fine clock mark to the length of the area where the wobble for the fine clock mark is provided is in the range of 1/300 to 1/50. .

Further, according to the present invention, in an optical disk capable of recording and / or reproducing information on and from a land and a groove, at least one of a first wobble including land and groove address information on at least one wall of the groove and at least one of the groove Characterized in that a second wobble is provided on the wall.

Further, according to the present invention, in an optical disk capable of recording and / or reproducing information on and from a land and a groove, a first wobble including address information for the land and the groove is provided on at least one wall of the groove, and the address information is recorded. A second wobble is provided on at least one wall of the groove in a region other than the region where the wobble including the wobble is provided.

Further, the present invention is characterized in that the first wobble includes a first waveform and a second waveform different from the first waveform. Further, the present invention provides an optical disk apparatus for recording and / or reproducing data on / from a recordable / reproducible optical disk composed of lands and grooves, an optical unit for guiding one laser beam to the optical disk, and a laser beam centered on the land or groove. It is characterized by comprising control means for guiding and detecting means for detecting a signal from the optical disk.

According to the present invention, there is provided an optical disc apparatus for recording and / or reproducing data on / from a recordable / reproducible optical disc comprising lands and grooves, an optical means for guiding one laser beam to the optical disc, and both sides of the land or the groove. Detecting means for detecting a fine clock mark provided in the apparatus, detecting peaks of the two detected fine clock marks, calculating a difference between two detected peak intensities, and converting the calculated result into a tracking error signal. And an offset correction circuit for adding.

Further, according to the present invention, in a recording medium capable of recording and / or reproducing data on and from a land and a groove, a wobble including address information for the land and the groove is provided on one of the walls of the groove and includes the address information. In a region other than the region where the wobbles are provided, wobbles of a fixed wavelength are provided on the walls on both sides of the groove.

Further, according to the present invention, in a recording medium capable of recording and / or reproducing data on and from a land and a groove, a first wobble modulated by land and groove address information is provided on one of the walls of the groove. In a region other than the region where the first wobble is provided, the second wobble having a fixed wavelength is provided on both sides of the groove.

According to the present invention, there is provided a recording medium in which an equal width groove is formed in parallel with a land and at least one wall of the equal width groove is wobbled in a width direction of the groove to form an address information block. In the information block, wobbles including address information for lands and grooves are provided, and another wobble is provided on walls on both sides of the groove in an area other than the address information block.

According to the present invention, there is provided a recording medium for forming an address information block by forming an equal width groove in parallel with a land and wobbling at least one wall of the equal width groove in the width direction of the groove. The information block is formed by the first wobble, and the area other than the address information block is formed by the second wobble.

Further, the present invention is characterized in that the wavelength of the first wobble is shorter than the wavelength of the second wobble. Further, according to the present invention, in a recording medium capable of recording and / or reproducing data on and from a land and a groove, wobbles having a fixed wavelength are formed continuously with the groove being equal in width, and modulated on one wall of the groove by address information. The wobbles are formed intermittently at predetermined intervals.

Further, the present invention is characterized in that the wavelength of the modulated wobble is shorter than the fixed wavelength. Also, the present invention provides a recording medium in which an equal width groove is formed in parallel with a land therebetween and the equal width groove is wobbled in the width direction of the groove to form an address information block. The information blocks are formed so as to be aligned in the width direction of the groove, and the address information block has a first address common to the address of the adjacent groove and a second address common to the address of the adjacent groove. And an address.

Further, the present invention is characterized in that the recording medium is recorded optically or magneto-optically. Further, the present invention is characterized in that the recording medium is a disk in which equal-width grooves are formed concentrically or spirally. Further, the present invention is characterized in that the address information block includes an address mark designating one of the first address and the second address.

Further, the present invention is characterized in that the address marks are formed in a row in the width direction of the adjacent groove. Further, the present invention is characterized in that adjacent address marks are formed in mutually opposite phases. Further, the present invention is characterized in that fixed period synchronization information is formed prior to the first address or the second address.

Further, the present invention is characterized in that address information blocks are formed alternately with data recording blocks. Further, the present invention is characterized in that the equal-width grooves of the data recording block are wobbled at a constant period. Further, the present invention is characterized in that the equal width grooves of the address information block are formed with a shorter cycle than the equal width grooves of the data block.

According to the present invention, the wobbling cycle of the equal width groove of the address information block is 1.20 to 5.0 μm.
And the wobbling cycle of the equal width groove of the data block is in the range of 5 to 50 μm. Further, the present invention is characterized in that the wobbling period of the equal width groove of the address information block is in the range of 1.60 to 1.76 μm, and the wobbling period of the equal width groove of the data block is in the range of 5 to 50 μm. And

According to the present invention, the wobbling cycle of the equal width groove of the address information block is 1.20 to 5.0 μm.
And the wobbling cycle of the equal width groove of the data block is in the range of 10 to 32 μm. Further, the present invention is characterized in that the wobbling cycle of the equal width groove of the address information block is in the range of 1.60 to 1.76 μm, and the wobbling cycle of the equal width groove of the data block is in the range of 10 to 32 μm. I do.

Further, according to the present invention, the wobbling cycle of the equal width groove of the address information block is 1.20 to 5.0 μm.
And the wobbling cycle of the equal width groove of the data block is in the range of 15 to 25 μm. Further, the present invention is characterized in that the wobbling cycle of the equal width groove of the address information block is in the range of 1.60 to 1.76 μm, and the wobbling cycle of the equal width groove of the data block is in the range of 15 to 25 μm. I do.

Further, the present invention is characterized in that the wobbling amplitude of the address information block is in the range of ± 15 to ± 70 nm. Further, the present invention is characterized in that the wobbling amplitude of the address information block is in a range of ± 25 to ± 70 nm. Further, the present invention is characterized in that the wobbling amplitude of the address mark portion is in a range of ± 15 to ± 35 nm.

Further, the present invention is characterized in that the wobbling amplitude of the address mark portion is in a range of ± 30 to ± 150 nm. Further, the present invention is characterized in that the wobbling amplitude of the address mark portion is in a range of ± 60 to ± 120 nm. Further, the present invention is characterized in that the wobbling amplitude of the address mark portion is in a range of ± 70 to ± 120 nm.

Further, the present invention is characterized in that the wobbling amplitude of the data portion is in the range of ± 10 to ± 60 nm. Further, the present invention is characterized in that the wobbling amplitude of the data portion is in a range of ± 10 to ± 40 nm.
Further, according to the present invention, the wobbling amplitude of the data portion is ± 1.
It is in the range of 5 to ± 35 nm.

Further, the present invention is characterized in that the equal-width grooves of the address information block are wobbled with the address information and wobbled even in the same cycle as the data recording block. According to the present invention, the amplitude of the wobble forming the address information is ± 15 to ± 150.
nm.

Further, the present invention is characterized in that the amplitude of the wobble forming the address information is in the range of ± 25 to ± 90 nm. Further, the present invention is characterized in that the wobble amplitude of the address mark portion is in a range of ± 30 to ± 200 nm. Further, the present invention is characterized in that the wobble amplitude of the address mark portion is in a range of ± 60 to ± 150 nm.

According to the present invention, the wobbling cycle of the equal width groove of the address information block is 1.20 to 5.0 μm.
And the wobbling period of the equal width groove of the data block is 0.8 to 10 μm, or 1.2 to 5.0.
μm, or a range of 1.6 to 3.0 μm.

According to the present invention, the wobbling cycle of the equal width groove of the address information block is 1.60 to 1.20 μm.
m, and the wobbling period of the equal width groove of the data block is 0.8 to 10 μm, or 1.2 to 5.
0 μm or a range of 1.6 to 3.0 μm.

The present invention is further characterized in that the wobbling amplitude of the equal width groove of the data block is in the range of ± 5 to ± 25, ± 5 to ± 20, or ± 7 to ± 14 nm. . Further, the present invention is directed to a correction method for eliminating a leakage of a reproduction signal in a recording medium in which an equal width groove is formed in parallel with a land and an equal width groove is wobbled in the width direction of the groove to form an address information block. It is characterized in that a TOC area containing information on the amount is provided on the inner peripheral portion and / or the outer peripheral portion of the recording medium.

Further, according to the present invention, a signal recording area of a recording medium for forming an address information block by forming equal-width grooves in parallel with a land and wobbling the same-width grooves in the width direction of the grooves. To
A large number of (a) a specific area in which a signal of a predetermined format equal to a reproduction signal from which a magneto-optical signal is erased is recorded, and (b) a signal area in which a signal is recorded subsequent to the specific area are provided. And

Further, according to the present invention, an equal-width groove is formed in parallel with a land therebetween, and the equal-width groove is wobbled in the width direction of the groove to form an address information block and a correction for eliminating leakage of a reproduction signal. In an optical disc device for recording and / or reproducing a TOC area including information on an amount on a recording medium provided on an inner peripheral portion and / or an outer peripheral portion of a recording medium, the groove wall is formed based on a correction amount reproduced by an optical unit. A correction signal generation circuit for generating a correction signal obtained by correcting the phase and amplitude of the wobble, and a subtractor for subtracting the correction signal generated by the correction signal generation circuit from the reproduction signal. .

Further, according to the present invention, an equal-width groove is formed in parallel with a land therebetween, and the equal-width groove is wobbled in the width direction of the groove to form an address information block and a correction for eliminating leakage of a reproduction signal. In an optical disc apparatus that records or / and reproduces a TOC area including information about the amount on a recording medium provided on an inner peripheral portion and / or an outer peripheral portion of a recording medium, a correction amount that changes based on a correction amount reproduced by an optical unit. A correction amount generation circuit that determines the range of, a subtractor that subtracts each correction amount determined by the correction signal generation circuit from the reproduction signal, and a reproduction signal from the subtractor are input to detect an error rate for each correction amount. And an error rate detection circuit for detecting a reproduction signal corresponding to a correction amount at which the error rate is minimized.

According to the present invention, an equal-width groove is formed in parallel with a land therebetween, and the equal-width groove is wobbled in the width direction of the groove to form an address information block. a) a specific area in which a signal of a predetermined format equal to the reproduced signal from which the magneto-optical signal has been erased is recorded; and And / or in an optical disc apparatus for reproduction, a waveform memory for storing a reproduction signal obtained by reproducing a signal of a predetermined format recorded in a specific area, and a reproduction signal input to one terminal, and synchronized with the input of the reproduction signal. Subtraction for inputting a reproduction signal of a predetermined format signal from the waveform memory to the other terminal and subtracting the reproduction signal of the predetermined format signal from the reproduction signal Characterized in that it comprises a and.

Further, according to the present invention, recording and / or reproducing is performed on a recording medium in which address information blocks are formed by forming equal-width grooves in parallel with a land therebetween and wobbling the same-width grooves in the width direction of the grooves. In an optical disk device, an A / D converter for performing A / D of a reproduction signal, and a synchronous detection circuit for receiving a signal from the A / D converter and detecting a signal corresponding to one wavelength of a wobble provided in a groove An adder for averaging the reproduction signal by adding the signal from the synchronous detection circuit a predetermined number of times, a waveform memory for storing the reproduction signal averaged by the adder, and a reproduction signal from the A / D converter. And a subtractor for receiving the averaged reproduction signal from the waveform memory and subtracting the averaged reproduction signal from the reproduction signal.

According to the present invention, there is provided an optical disc capable of recording and / or reproducing data on and from a land and a groove, wherein the groove comprises: (a) a first wobble having a first frequency provided on one of the walls; , (B) a first wobble provided on a wall different from the wall provided with the first wobble, and a second wobble having a second frequency different from the first wobble.

Further, the present invention is characterized in that the first wobble includes address information. In addition, the present invention provides the second
Is characterized by including clock reproduction information. According to the present invention, there is provided a recording medium in which the intensity of light reflected from a groove or a land changes periodically.

Further, the present invention is characterized in that the recording medium includes address information in a groove or a land, and the intensity of light reflected from the groove or the land changes periodically. Further, the invention is characterized in that the recording medium is an optical recording medium. Further, the invention is characterized in that the recording medium is a magneto-optical recording medium.

Further, the present invention is characterized in that the recording medium is a magneto-optical recording medium by magnetic domain expansion. Further, the present invention is characterized in that the address information is information common to the groove and the land. Further, the present invention is characterized in that the address information is recorded as wobbles.

Further, the present invention is characterized in that the wobble is formed on at least one of the walls of the groove. According to the present invention, in a recording medium capable of recording and / or reproducing data on and from a land and a groove, a wobble including address information for the land and the groove is provided on one of the walls of the groove, and a wobble including the address information is provided. In a region other than the region, a region where no groove is provided is periodically present.

Further, the present invention is characterized in that the address information is recorded by a bi-phase modulation method.
Further, the present invention is characterized in that the interval between the regions where no groove is provided is in the range of 50 to 150 μm.
Further, the invention is characterized in that the width of the region where no groove is provided is in the range of 0.5 to 4 μm.

In the present invention, the wobble amplitude is 60 to
It is characterized by a range of 150 nm. Further, the present invention includes a land and a groove, a wobble including address information for the land and the groove is provided on one of the walls of the groove, and the groove is formed in an area other than the area where the wobble including the address information is provided. In an information recording / reproducing apparatus that performs recording and / or reproduction on a recording medium in which a region not provided periodically exists, a magnetic head that applies a magnetic field to the recording medium, an optical unit that irradiates the recording medium with a laser beam, A synchronization signal generation circuit for generating a synchronization signal from a reproduction signal reproduced by the optical means; and a control circuit for controlling the optical means and the magnetic head based on the synchronization signal generated by the synchronization signal generation circuit. Features.

Further, the present invention is characterized in that the synchronization signal generation circuit generates a synchronization signal based on a reproduction signal from an area other than an area including address information. Also, the present invention provides a comparator in which a synchronization signal generation circuit binarizes a reproduction signal reproduced by an optical unit, and a PL which generates a timing pulse from the signal binarized by the comparator.
An L circuit and a clock generation circuit that generates a synchronization signal composed of a predetermined clock based on a timing pulse generated by the PLL circuit are included.

Further, according to the present invention, the photodetector in the optical means has a light receiving surface including a first area, a second area, a third area, and a fourth area, and the first and second areas are provided. The reproduction signal is obtained from an area other than the area including the address information by calculating the sum of the reflected light intensities of the laser beams detected by the recording medium in the third, fourth, and fourth areas.

[0055]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment An optical disk recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 1, 2, 3 and 4 show a first embodiment of the present invention. The grooves shown in FIG. 3 are grooves formed on the surface of the disk, and are provided spirally from the inner circumference to the outer circumference of the disk. The master glass for making discs is a mastering process.
A groove is formed while meandering a wobble signal obtained by FM-modulating a 1.1 MHz carrier with a frequency deviation of ± 50 KHz by a biphase signal. The frequency of the carrier is determined by the number of addresses allocated to the entire disk, but is desirably set in the range of 200 kHz to 10 MHz.

The amplitude W of the wobble provided in the groove formed in this manner is approximately 30 nm to 50 nm in the radial direction of the disk. The depth of the groove is set to approximately 1/6 to 1/1 of the laser beam wavelength λ so that crosstalk from adjacent tracks recorded on the land and the groove is reduced.
It is set to 2. Land and groove pitch is 0.55μm
The widths of the lands and the grooves are set to be the same so that the C / N (carrier noise ratio) of the pit signals recorded with the same reflectance is the same.

Each track of a land or a groove on the disk is composed of 60 zones, and so-called CAV control is performed at a constant rotation speed for each zone. As for the linear velocity, the rotation speed is large at the inner peripheral portion and is small at the outer peripheral portion so as to be substantially constant in each zone. As shown in FIG. 2, one track is composed of a plurality of frames. The inner peripheral portion has 42 frames for one rotation of the disk, and the outer peripheral portion has 101 frames for one rotation of the disk. Each frame is further composed of 26 segments, and address information is recorded only in the address segment located at the head of the frame. The data consists of two consecutive
5 and are not wobbling. A fine clock mark is recorded at the head of each segment, and the rotation is controlled by this.
The amplitude of the fine clock mark is also set to approximately 30 nm to 50 nm in the disk radial direction, similarly to the address information. The fine clock mark is also effective for generating a clock for reading data, and can be applied to a data modulation method having no clock component.

The laser beam emitted from the laser light source of the optical pickup passes through the collimator lens, enters the objective lens from the beam splitter, and is condensed on the disk to form a beam spot shown in FIG. Laser oscillation wavelength λ = 635 nm, Objective lens aperture ratio NA =
Assuming 0.6, the focused spot size of the laser beam is about 0.9 μm. The return light from the beam spot is received by a main detector and a sub detector and converted into an electric signal. The main detector shown in FIG. 1 is a four-divided light receiving element, [(A + C)-(B + D)].
As a result, a focus error signal of the astigmatism method is detected. Push-pull signal from beam spot [(A + D)
− (B + C)] is obtained by differentially amplifying each output by a differential amplifier, and a tracking error signal of a beam spot is obtained from the push-pull signal.

A tracking error signal and a signal obtained by inverting the signal by an inverting amplifier are applied to a tracking polarity switch SW
When the tracking error signal is selected by the tracking polarity switch SW as shown in FIG. 1 and input to the servo circuit as shown in FIG. 1, the beam spot moves to the center of the groove as shown in FIG. Is controlled.
In this state, since a wobble signal is obtained from the push-pull signal of the differential amplifier, the wobble signal is output to a bandpass filter via a capacitor for removing a DC component. The band pass filter has a band center frequency of 1.1 MHz,
The noise is removed and the wobble signal is passed and output to the comparator. The comparator shapes the wobble signal into a rectangular wave.

The rectangular wave output from the comparator is FM
It is also output to the demodulator. The FM demodulator demodulates a biphase code from the wobble signal and outputs the demodulated signal to the NRZ demodulator. The NRZ demodulator demodulates an NRZ signal that is an ATIP (address code) from the biphase code. The ATIP obtained in this way is input to the system controller. In the system controller, the polarity pattern of the address mark having two patterns is detected by the address mark detector, and the signal from the address mark detector detects which of the read first and second address information is currently being recorded or reproduced. It discriminates whether it indicates an address.

As described above, the laser beam is controlled so as to form a beam spot at the center of the groove while reading the address on the disk. FIG. 3C shows a state where the beam spot is controlled to be at the center of the land 2. In this case, the tracking error signal, which is the output of the differential amplifier, is inverted by the inverting amplifier, selected by the tracking polarity switch SW, and input to the servo circuit, as shown in FIG. Controlled at the center of the land. At this time, the push-pull signal is outputting a wobble signal and is output to an amplifier via a capacitor for removing a DC component.

Further, the address mark provided for determining which of the first and second address information indicates the currently recorded or reproduced address can be easily formed by a pattern as shown in FIG. To work. That is, when the track pitch is 0.55 μm, the amplitude is made larger than that of the fine clock mark or the address information to be approximately ± 0.1 μm. Then, in an odd-numbered groove and an even-numbered groove,
Wobble having the opposite phase is recorded as an address mark. For an odd-numbered groove, the amplitude changes in the order of +0.1 μm to −0.1 μm with respect to the center of the track, and for an even-numbered groove, the amplitude changes in the order of −0.1 μm to +0.1 μm. Therefore, when the laser beam passes through the address mark portion, the width of the land changes from 0.75 μm to 0.35 μm in the land with the even address, and from 0.35 μm to 0.7 in the land with the odd address.
It changes to 5 μm. Since the change in the width of the land appears as a change in the amount of light reflected from the disk, the sum [D of outputs from the respective areas A, B, C, and D of the photodetector divided into four parts [D
A + DB + DC + DD], it is possible to determine whether the address is an odd-numbered land or an even-numbered land. That is, [DA + DB + DC + DD]
Is input to the comparator, and is used to discriminate between lands having odd addresses and lands having even addresses. In an even-numbered land, a signal 101 appears at the output of the address mark detector 110 in FIG. 1, and as a result, address 1 is selected. In the case of an odd-numbered land, a signal 102 appears at the output of the address mark detector 100 in FIG. 1, and as a result, address 2 is selected. On the other hand, the width of the groove is constant regardless of whether the address is odd or even. Therefore, the address mark detector 110 shown in FIG. 1 is used to distinguish between an odd-numbered groove and an even-numbered groove. When the tracking error signal is passed through a band-pass filter, the address changes from plus to minus in an odd-numbered groove, and changes from minus to plus in an even-numbered groove. As a result, in the output from the address mark detector, the signal 112 appears in the groove having the odd address, and the address 2 is detected. In an even-numbered groove, a signal 111 appears, and address 1 is selected.

When the system controller instructs the groove to perform recording / reproduction, the beam spot 5 is controlled so as to be at the center of the groove 2. When the system controller instructs the land to perform recording / reproduction, the beam spot is controlled so as to be at the center of the land. Which indicates the address at which recording or reproduction is currently being performed.

Since the embodiment is constructed as described above, the present invention is applicable not only to a magneto-optical disk but also to a phase change disk or a so-called mini disk as a CD-WO (write-once) disk or optical disk. Can be applied. In the embodiment, the glass master for producing the disc is a wobble signal obtained by FM-modulating a carrier of 1.1 MHz with a biphase signal with a frequency deviation of ± 50 KHz in a mastering process. It is also possible to form a groove as a wobble signal as it is.

In the above description, the amplitude of the wobble provided in the groove is 30 in the radial direction of the disk.
Although the thickness is set to be from 50 nm to 50 nm, the present invention is not limited to this. Second Embodiment A second embodiment of the present invention will be described with reference to FIG. 6, FIG. 7, FIG. 8, and FIG. In the second embodiment, the grooves are grooves formed in the surface of the disk, and are provided in a spiral shape from the inner circumference to the outer circumference of the disk. In an optical disk that performs recording and reproduction on both lands and grooves, a glass master for producing the disk is basically a single unit serving as a reference when generating a bit clock at the time of disk rotation control and data recording and reproduction in the mastering process. A meandering groove is formed by a signal wobbled by a clock of one frequency. Less than,
This is called clocking wobble. In this case, the frequency of the clocking wobble is set to 2 MHz, which is one eighth of the bit clock frequency 16 MHz of the data to be recorded so that it can be synchronized with the data to be recorded. Approximately 200 kHz to 10 MH in consideration of frequency characteristics of equipment and regeneration system circuits
It is desirable to set in the range of z. Further, it may be in the range of 50 kHz to 10 MHz. Further, the amplitude of the wobble provided in the groove is approximately 10 nm to 50 nm in the radial direction of the disk. The depth of the groove is set to be approximately 1/6 to 1/12 of the wavelength of the laser beam so that crosstalk from an adjacent track is reduced for signals recorded on the land and the groove. The distance between the center of the land and the center of the groove is 0.55 μm, and the width of the land and the groove is almost the same so that the respective reflectances are equal and the C / N ratio of the recorded pit signal is equal. I have.

Each track of a land or a groove on the disk is composed of 60 zones, and so-called CAV control is performed at a constant rotation speed for each zone. The greater the number of zones having a constant rotation speed, the more effectively the area on the disk that can be recorded is used. The rotation speed for each zone is controlled so as to be a large rotation speed in the inner peripheral portion and a small rotation speed in the outer peripheral portion so that a constant linear velocity is obtained in each zone.

In the wobble signal, in addition to the clocking wobble, so-called address information for indicating an absolute address on the disk is recorded. Regarding this address information, the segment at the head position of the frame, which is a unit of the address information, is defined as an address segment, and the address information is recorded in this portion. The address information is modulated using a bi-phase encoding method, and a wobble is carved in the groove by the bi-phase signal. At this time, as for the clocking wobble, as shown in FIG. 6, the wobbling waveforms of the grooves on both sides formed between the lands so that the clocking wobble and the address information can be detected even in the recording and reproduction of the land. It is formed so as to have the same shape. In addition to the address information A indicating the absolute address on the track of the groove, the address information can be detected in the recording and reproduction of the land as in the case of the clocking wobble portion. FIG. 3B and FIG. 3 show address information B formed so that the wobbling waveforms of the grooves formed on both sides of the land are the same.
By arranging as shown in (c), it is possible to detect the address information B even when recording / reproducing a land.
That is, the spot of the laser beam indicated by the circle in FIG. 3B traces the groove m. In this case, m and n can be detected as the address information. In this case, m corresponds to the above address information A, and n corresponds to the above address information B. Here, both the address information A and the address information B can be detected in the recording / reproducing of the groove, but the same as in the first embodiment for determining which of them indicates the address in the corresponding groove. Add an address mark.

The spot of the laser beam indicated by the circle in FIG. 3C traces the land n. In this case, n can be detected as the address information. FIG. 7 shows a format of a disk according to the present embodiment. As shown in FIG. 7, each track of the groove and the land is composed of a plurality of frames. In this embodiment, the inner peripheral portion has 42 frames for one rotation of the disk, and the outer peripheral portion has 101 frames for one rotation of the disk. Each frame is further composed of a plurality of segments, and address information is recorded only at the position of the address segment located at the head of the frame. In the present embodiment, each frame is 26
Segment.

As described above, the wobble by the clock of a single frequency serving as a reference when generating the bit clock at the time of controlling the rotation of the disk and recording / reproducing the data is obtained by setting the lands over the tracks of the grooves and lands on the disk as described above. Since the wobbling waveforms of the grooves on both sides formed between the grooves are formed to be the same, they are radially arranged on the disk in the same phase in the zone of 60 where the rotation speed is constant. As described above, the wobble clock can be used for rotation control, and is also effective as a reference for generating a read clock for data to be recorded / reproduced. That is, when recording data, the rotation of the disk is controlled so that the clock synchronized with the data and the clock by the wobble on the disk can be synchronized. When the data is reproduced,
It is possible to read out the data reproduced by the clock by the wobble on the disk, or to output the data in synchronization with a clock signal input from the outside.

In this embodiment, as shown in FIG. 7, the address information has 4 bits for SYNC and 24 bits for address data.
Although the bits and CRC are 14 bits, the number of these bits is not limited depending on the capacity of the disk and the setting method of the address number. In addition, it is also possible to record and use the information unique to the disc such as the laser power condition setting at the time of recording or reproduction and information replacing the function of the above-mentioned address mark in a portion following the address number by wobble. . Furthermore, the encoding method of the data of the address information is not limited to the bi-phase code, but may be a Manchester code, NRZ, NRZI code, or the like.

In FIG. 7, it has been described that the data area is composed of data segments separated into respective sections. However, the present invention is not limited to this, and a data area which is not divided into areas may be used. FIG. 8 shows a wobbling signal near the address segment. This shows a case where information replacing the function of the address mark is recorded as wobble as address information in the address segment. As can be seen from FIG. 8, as a result, zero is recorded as the value of the bi-phase data also in the clocking wobble portion. Therefore, in FIG. 7, a signal obtained by bi-phase modulation of address information data is provided in an address segment portion, and a signal obtained by bi-phase modulated data having a value of zero is wobbled in a data segment portion. Will be recorded.

In the second embodiment, similarly to the case where the beam spot is controlled at the center of the groove, the push-pull signal from the beam spot is also controlled when the beam spot is controlled at the center of the groove. It is possible to reproduce a wobble signal according to the waveform. As a result, it is possible to perform rotation control and address information detection using only one laser beam.

The recording / reproducing apparatus used in the second embodiment has the structure shown in FIG. 9 and is almost the same as the apparatus shown in FIG. 1, except that it is connected in parallel with the address mark detector after the comparator. The only difference is that the detected wobble signal is provided with a PLL which functions as a disk rotation control circuit and a data clock generation circuit. Third Embodiment In the third embodiment, a TOC (Table of Content) provided at the beginning of a track is provided.
A recordable and / or reproducible optical disk having a wobble in an area will be described. Referring to FIG. 10, of the laser power at the time of recording, the laser power at the time of reproduction, the rotation speed of the optical disk, etc., which are information to be described in the TOC area, the laser power at the time of recording and the laser power at the time of reproduction are defined as wobbles. An optical disc in which information is recorded and other information is recorded as a pit row on a flat portion of a groove or land will be described. The laser power at the time of recording and the laser power at the time of reproduction are the wobble 93 provided in the groove 92 of the optical disk.
At a predetermined frequency. The wobble frequency is 2
The range is from 00 kHz to 10 MHz. The TOC information other than the laser power is recorded as pit rows 94 in the lands 91 and the grooves 92. The length of the TOC area is about 160 μm from the start of the track. The TOC information recorded by wobbles and pit strings is reproduced by irradiating a laser beam. By recording the TOC information in both wobbles and pit rows, the TOC information can be recorded at a high density, and the TOC information can be reproduced at a high speed during reproduction. Fourth Embodiment An actual optical disk has some warping. When such an optical disk is to be reproduced, the reflected light of the laser beam emitted from the semiconductor laser on the signal recording surface is slightly shifted. It will be focused on the photodetector. as a result,
An offset occurs in the reproduction signal. The fourth embodiment relates to a reproducing apparatus for correcting the offset of the reproduced signal. This offset occurs because the laser beam to be applied is not applied to the center of the land or groove.

As shown in FIG. 2, the address portion and the signal portion are provided with the fine clock mark periodically, and the offset of the reproduction signal is corrected by detecting the fine clock mark. In addition, FIG.
In the embodiment, the fine clock mark is provided for each data segment. However, the present invention is not limited to this, and the fine clock mark may be provided in the data area.

Referring to FIG. 11, fine clock marks are formed on the walls on both sides of the groove in the form of wobbles by 50-300.
It is provided in the process of forming the master of the optical disk at an interval W1 of μm. The length W2 of the region wobble is formed for the fine clock _{mark, W 2 / W 1 = 1} /300
The length is determined so as to satisfy １／1/50. The fine clock mark provided in the form of this wobble,
When the laser beam is irradiated on the land or the groove, the detected waveform is detected. When the laser beam is irradiated on the center of the land or the groove as shown in FIG. In this case, the relationship of I _A = I _B is the intensity I _A and intensity I _B. The waveform 122 or waveform 123 next if the laser beam is deviated to either the center of the land or groove, respectively, I _A
> I _B, a relationship of I _A <I _B. Therefore, the deviation from the center of the laser beam of the land or groove by calculating the difference between the detected intensities I _A and intensity I _B, i.e., capable of detecting the offset generated in the reproduction signal.

Referring to FIG. 13, offset of reproduced signal
The following describes a reproducing apparatus that performs signal reproduction by correcting the above.
Detected by the main detector 131 divided into four parts
Of the signals from the main clock mark, the B and C parts
The sum of the signals detected at is obtained as [B + C],
The sum of the signals detected in the A section and the D section is [A + D]
Taken out. The extracted signals [B + C] and [A +
D] are the first in the offset correction circuit 132, respectively.
The first peak detecting means 133 and the second peak detecting means 134
At each signal intensity I_AAnd I_BIs detected,
Detected intensity I _AAnd strength I_BIs input to the differential amplifier 135.
[I_A-I_BIs calculated. Also, the signal [B + C]
And [A + D] obtain a normal tracking error signal
Input to the differential amplifier 136 and [A + D] − [B
+ C] is performed. Performance of [A + D]-[B + C]
The calculation result and [I_A-I_B] Is calculated by the amplifier 137.
To correct the tracking signal offset.
And Subsequent operations are the same as those described with reference to FIG.
Omitted.

In the above description, the case where the fine clock mark is a track in which no wobble is formed in the groove is shown. However, the present invention is not limited to this. The same applies to the case of a truck. In this case, the wobble for the fine clock mark is a higher frequency wobble than the wobble provided on the track. The wobble interval for the fine clock mark is 50 to 30.
It is in the range of 0 μm, and the ratio W ₂ / W ₁ between the wobble interval for the fine clock mark and the length of the area where the wobble is provided satisfies 1/300 to 1/50.

FIG. 14 shows the case where wobbles are provided on both sides of the groove. However, a medium in which wobbles are formed only on one side of the groove is conventionally known.
Regarding this, for example, the 42nd Federation of Applied Physics-related Lectures, Proceedings No. 328a-T-1, p102
I am familiar with 5. In the present invention, a wobble for a fine clock mark is provided on a medium having a track in which a wobble is formed on one of the grooves. That is, as shown in FIG. 15, a wobble is provided on one of the grooves, and a wobble for a fine clock mark is provided on both the groove wall provided with the wobble and the groove wall provided with no wobble. In the medium shown in FIG. 15 as well, the interval between wobbles for the fine clock mark is in the range of 50 to 300 μm, and the ratio W ₂ / between the interval between the wobbles for the fine clock mark and the length of the area where the wobble is provided. W ₁ is 1/300
１ ／ 1/50.

Although offset correction has been described for signal reproduction, fine clock marks provided in the form of wobbles on both sides of the groove are detected during signal recording, and the offset correction circuit 134 performs tracking. By correcting the offset of the signal, the laser beam can be irradiated to the center of the land or groove, and the signal can be recorded at a proper position. The configuration of the recording apparatus used in this case is shown in FIG.

In the case of a medium having a track in which a wobble is formed only in one of the grooves, the wobble is formed not only in the above-described FIG. Medium. Also in this case, the wobble for the fine clock mark is formed on both sides of the groove at the same interval and amplitude as described above, and the wobble for the fine clock mark is detected to correct the offset of the reproduction signal. Is what you do. The address information recorded on the wobble may be used as address information for lands and grooves on both sides of the wobble, and the same address information may be recorded on the wobble a plurality of times.

The fine clock mark is used to generate a synchronization signal for recording and / or reproducing a signal on a magneto-optical recording medium. That is, a fine clock mark is detected, and a synchronization signal is generated in synchronization with the detected timing. The generated synchronization signal is used for recording or reproducing the signal. Fifth Embodiment In the fourth embodiment, an example has been described in which a wobble for a fine clock mark is provided on a track provided with a wobble or a track provided with no wobble. The optical disk according to the present invention is not limited to those shown in FIGS. 14 to 16, but may be an optical disk capable of detecting a wobble provided on a track and generating a synchronization signal from the detected wobble. FIG.
7, an example of another optical disk will be described.
The optical disc shown in FIG. 17 is an optical disc in which a land and groove address section 170 is formed by wobbles 172 and 173, and 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 disk shown in FIG. 17, two different addresses are recorded in the address section 170, the wobble 172 is a land address, and 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. 18, synchronization signals D1, D2,... Dn are generated at each time point 1761, 1762,. . Therefore, in the optical disk shown in FIG. 17, unlike the optical disks shown in FIGS. 14 to 16, the fine clock mark for generating the synchronizing signal is not formed with a special wobble different from the wobble which is formed on the track. The feature is that a synchronization signal can be generated. In the optical disc according to the present invention, each of the time points 176 at which the synchronization signal is generated
, 172n, the wobble frequency is set so as to be in the range of 20 to 30 μm. .. 176n are set to 20 μm, and the amplitude of the wobble 174 is set to 30,4.
As a result of measuring the CN ratio and the jitter of the reproduced signal by changing to 0 and 60 nm, as shown in FIG. 19, as the amplitude of the wobble 174 increased to 30, 40 and 60 nm, the CN ratio of the reproduced signal was improved, and Decrease. Each time point 1
, 176n, 25, 3
Similar results were obtained when the thickness was changed to 0 μm.

Further, the optical disk according to the present invention is shown in FIG.
0 may be used. The address portion of the optical disk shown in FIG. 20 is obtained by superimposing a wobble 200 indicating an address on the wobble 174 in FIG. FIG.
7, two addresses are recorded in the address section 170 of the optical disc shown in FIG. 7, but in the optical disc shown in FIG.
The wobble 200 is formed only on one wall of the groove. 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. 17, 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 disk shown in FIG. 21, the wobble 174 formed in the data area is not formed in the address section 170, and the wobble 21 is not formed.
Only zeros are formed in one of the grooves. Also in this optical disc, an address detected by reproducing the wobble 210 with a laser beam 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. 17, and the frequency of the wobble provided in the data area for generating the synchronization signal is also the same.

Further, the optical disk according to the present invention comprises:
The optical disk shown in FIGS. 22 and 23 may be used.
The optical disc shown in FIGS. 22 and 23 has a structure in which the wobble 174 formed in the data portion is formed on one wall of the groove in the optical disc shown in FIG. 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. 17, and the frequency of the wobble provided in the data area for generating the synchronization signal is also the same.

Referring to FIG. 24, FIG.
The playback devices for the optical disks shown in 1, 22, and 23 will be described. Each area A of the quadrant sensor 240,
The signals detected at B, 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. After that, [A + D]-[B + C] is a low-pass filter 2 that cuts a high band to generate a tracking error signal.
42, a bandpass filter 243 for wobble detection, and a bandpass filter 244 for address demodulation.
The band pass filter 244 demodulates an address from a reproduced signal obtained by detecting a wobble provided in the address section. The band pass filter 24
In 3, the high frequency band and the low frequency band of the reproduced signal are cut and sent to the comparator 245. The point in time at which it intersects the base axis is detected, and the result is sent to the PLL circuit 246. PLL
The circuit 246 generates a synchronizing signal for a reproduction signal based on the time point transmitted. The generated synchronization signal is sent to a disk rotation control circuit and a data clock generation circuit.

Referring to FIG. 25, the address section 170
And the details of the disc including 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 recorded or reproduced mainly in the data section using NRZI modulation or (1-7) modulation. 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 / b.
If it is assumed to be 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 of one wobble period on the disk is 1.60.
範 囲 1.76 μm. Also, preamble 1
(PA1), 4 bytes each for preamble 2 (PA2), address 1 (Address 1), 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 an actual data length, as shown in FIG. 26, PA1 and PA2 are 4 bits, 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 a 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. 27, when NRZI is used as the data modulation method, the data synchronization signal becomes 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. 28 shows the result 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. 29 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, one 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.

On the other hand, in the case of a phase-change disk or a dye-based or metal-based write-once optical disk, the wobble length is preferably in the range of 5 to 50 μm, and the amplitude is preferably in the range of ± 10 to ± 60 nm. Referring to FIG. 26, Address
42 bits are allotted to 1, Address2, respectively, and the Frame address is a number assigned 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 65 on the format
536 tracks can be secured. PA
1, PA2 and PA3 are Address1, Add
The ress2 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. 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 μ.
In the case of m, the amplitude amount needs to be ± 15 to ± 150 nm. In particular, the wobble signal Signal
To secure the noise ratio to noise and to accurately detect the address mark, the range of ± 25 to ± 7
A value of 0 nm is preferred. Address1, Address
The ss2 is recorded and reproduced on the disk by the same method as that described in the first and second embodiments. For this reason, as described with reference to FIG. 4, 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, (0,1) or (1,0)
Identifies odd or even numbers. About this identification method,
Since it is the same as the description of FIG. 27, it is omitted. And
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 1.2.
In the case of 8 μm, it is necessary to give the wobble an amplitude of ± 30 to ± 150 nm. As the amount of wobble amplitude,
Particularly, a value in the range of ± 60 to ± 120 nm is preferable. Also, in the present 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. One wobble cycle is 1.
At 2 μm or more, the error rate and margin of the address portion were improved, and the reproduction could be performed accurately. 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, PA1 has a feature that the phases of adjacent grooves are synchronized and can be used as a substitute for the fine clock mark for offset correction of the tracking signal described in the fourth embodiment.

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. Further, as described with reference to FIG. 4, two bits are assigned to the address mark portion for the odd-numbered groove and the even-numbered groove. (0,1) or (1,0) is formed as a wobble of the opposite phase.

Address1 and Address2 are:
Recording and reproduction are performed in the same manner as described in the first and second embodiments. Address1 and A
The identification of the address 2 is performed using the address mark, and the identification method is the same as the method described in FIG. In order to ensure this identification, 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 of the wobble is ±
Values between 30 and ± 150 nm are preferred. Furthermore, ± 60 ~
A value of ± 120 nm is preferred.

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 for the data can be detected not from the pits but from the information recorded in the 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.

Further, 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 synchronizing signal for recording and reproducing data from a carrier frequency because the noise ratio deteriorates and the bandwidth increases 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, 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 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. Sixth Embodiment The sixth embodiment will be described with reference to FIG. In the optical disk shown in FIG. 31, a land and groove address portion 310 is formed by a wobble 311, and a data area 313 following the address portion 310 has a wobble 312.
Is formed on the optical disc. The wobble 31
2 are formed on both sides of the groove, and the wobble 31
1 is formed on one of the walls of the groove. In the optical disk shown in FIG. 31, 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 sixth embodiment may have the structure shown in FIG. The optical disc shown in FIG. 32 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. Also, in the optical disc shown in FIGS.
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. 33, 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 part has a length of 64 bytes and the minimum one wobble cycle of the address part is one byte, the length of one wobble cycle 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. 34, the actual data length is assigned to 8 bits and 4 bits for PA1, 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 a 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. 27, when NRZI is used as the data modulation method, the data synchronization signal becomes 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.

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. This is the same as described in FIGS. That is, 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 1.2.
In the case of 8 μm, the signal to N of the wobble signal
In order to ensure the Oise Ratio and accurately reproduce the signal of the magneto-optical disk, the wobble must be ±
It is necessary to provide an amplitude of 10 to ± 60 nm.
In particular, when the bit density is 0.15 to 0.24 μm / bit,
In the case where the length of one wobble is 10 to 32 μm, the value is preferably such that the amplitude of the wobble is ± 10 to ± 40 nm.

On the other hand, in the case of a phase-change disk or a dye-based or metal-based write-once optical disk, it is preferable that the length of one wobble is in the range of 5 to 50 μm and the amplitude is in the range of ± 10 to ± 60 nm. Referring to FIG. 34, Address
Are assigned 48 bits, and Frame addr
Ess is a number assigned in one round of the track. Therefore, on the format, up to 1024 per track
Of frames (Nf) can be secured. The encoding method of the data of the address information is not limited to the biphase encoding method, but may be Manchester code, NRZ, N
RZI codes, Manchester codes, and the like are used. Tra
The ck address is a serial number assigned to the track on the entire disk from the inner circumference or the outer circumference. In this case, the land portion L2n and the groove portion G2n have the same address G.
Given by A2n. Therefore, on the format:
A maximum of 1048576 tracks can be secured. PA1 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 needs to be ± 15 to ± 150 nm. In particular, Signalto Noise R of the wobble signal
A value of ± 25 to ± 90 nm is preferable in order to secure atio and accurately detect an address mark. The address mark is used as a start signal for identifying an address portion and for recording and reproducing a signal. 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 (1), it is necessary to give the wobble an amplitude of ± 30 to ± 200 nm. The wobble amplitude is particularly ±
Values in the range from 60 to ± 150 nm are preferred. In the present embodiment, the highest frequency of the wobble in the address section is 8
Given the bit data length. This may be selected depending on the relationship with the recording density. When one wobble period is 1.2 μm or more, the error rate and margin of the address part are improved,
Reproduction could be performed with high accuracy. On the other hand, if this period is lengthened, the data format efficiency will decrease,
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 sufficient to provide one address in the groove, as compared with the embodiment based on FIG. 17, so that the format can be made more efficient. 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. Seventh Embodiment FIGS. 17, 20, 21, and 2 in the fifth embodiment.
Data area 171 in 2nd and 23rd, or 6th
The data areas 313 and 323 in FIGS. 31 and 32 according to this embodiment have a structure in which wobbles of a predetermined cycle are provided on both sides or one of the grooves. When a magneto-optical disc 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. This will be described in more detail with reference to FIG. In the structure of the magneto-optical disk shown in FIG. 35, the wobbles 351 provided on both sides of the groove have the same phase. Therefore, when the groove G is irradiated with the laser beam 352, the reflected light becomes the magnetization of the original signal. , But has a polarized wave component in the same direction as the arrow 353 indicating the direction of the groove determined by the wobbles 351 provided on both sides of the groove G. 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. 35, a polarized wave component due to the influence 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 characteristic. 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, in the seventh embodiment,
It is an object of the present invention to solve the above problem and to provide a magneto-optical disk in which wobbles provided on both sides of a groove G do not affect reproduction characteristics. With reference to FIG.
An embodiment will be described. FIG. 36 shows a wobble structure provided on the walls on both sides of the groove in the data area. On both sides of the groove G, wobbles 361 having a predetermined wavelength W and amplitude h are formed in the same phase. In the seventh embodiment, the leakage amount is -25 dB or less,
The wavelength W and the amplitude h of the wobble 361 are set so that the error rate is 1 × 10 ⁻⁴ or less.

FIG. 37 shows that the wavelength W of the wobble 361 is 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. 37, 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. 38 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. 38, 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, the error rate is 1 × 10 ⁻⁴ or less. 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.

Therefore, from the results shown in FIGS. 37 and 38, the leakage amount is -25 dB or less, and the error rate is 1 × 1.
Wavelength W and amplitude h of wobble 361 that can realize 0 ^-4 or less
Ranges from 0.8 to 10 μm, ± 5 to 5 μm, respectively.
The range is ± 25 nm. The values of the wavelength W and the amplitude h of the wobble are values that can be applied to a case where the wobble is provided on one of the walls of the groove G.

In the seventh embodiment, the wobbling cycle of the address information block is 1.60.
２2.0 μm. In the seventh embodiment,
Although the structure of the groove G in the data area has been described, the other parts such as the address area are the same as those in the fifth and sixth embodiments, and the description thereof will be omitted.

In the present embodiment, a lower error rate can be obtained because the synchronizing signal can be generated with higher precision than in the fifth and sixth embodiments. Eighth Embodiment In the seventh 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 this influence is exerted on the reproduction characteristics. Although an appearing leak occurs, a method of eliminating the leak will be described in the eighth embodiment.

The first erasing method will be described with reference to FIGS. 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, the inner peripheral portion 39
2 and / or a TOC area provided in the outer peripheral portion 391. Information about the leakage amount is recorded, and this information is detected at the time of reproduction to eliminate the leakage from the reproduction signal. It is. FIG.
Shows a circuit configuration for eliminating leakage. A reproduction signal is input to a terminal 40, and a band-pass filter (B
After the noise is removed by the PF 41, the signal is sent to the PLL circuit 42 and the correction signal generation circuit 44. The PLL circuit 42 receives wobble waveform signals provided on both sides of the groove shown in FIG. 41A.
The synchronization signal is detected from the wobble waveform shown in (1) and sent to a laser drive circuit and a decoder (not shown) via a terminal 43.
The signal is reproduced in synchronization with the synchronization signal. The correction signal generation circuit 44 determines the phase and amplitude of the signal (a) based on the information about the leakage amount recorded in the TOC area of the magneto-optical recording medium 39 input from the terminal 45 and outputs the signal (b).
And is sent to the subtractor 47. Further, a magneto-optical reproduction signal on which the wobble waveform shown in FIG.
7 is input. 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.

The second erasing method will be described with reference to FIGS. 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. 39, 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. 42 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. 43, 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 FIGS. 44, 45 and 46, a third erasing method will be described. The magneto-optical recording medium 440 has a TOC area on an inner peripheral portion 392 and an outer peripheral portion 391, and a signal recording area 445 has areas (hereinafter, referred to as specific areas) 441 and 443 in which information on a reproduction signal is recorded, and signal areas. 442 and 444 are formed as a set. In the specific areas 441 and 443, [11111 ...],
..] And [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 reproduction signal, it is possible to eliminate the leakage amount. [111]
11 ...], [00000 ...], [101010]
..] Are input and stored in the waveform memory 451. On the other hand, from the terminal 452, FIG.
Is input to the + terminal of the subtractor 453, and in synchronism therewith, the waveform memory 451 is supplied to the-terminal of the subtractor 453.
To (d) are input. The subtracter 453 subtracts the input signals (d) and (e) to obtain a signal (f) without leakage, and outputs the signal from the terminal 454.
After that, it is sent to a decoder (not shown) and extracted as a reproduced signal. In this case, [11111 ...],
The amount of leakage was detected from the signals [0000]... And [1010101...], But the same applies when 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. Then, the leakage amount can be detected.

Referring to FIGS. 47 and 48, 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,
5 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. 49, 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. Ninth Embodiment In a ninth embodiment, still another modification of the optical disc according to the present invention will be described. With reference to FIG. 50, the planar structure of the optical disc according to the ninth 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 28 MHz.
It is 1.25 to 375 kHz. In the ninth 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. With reference to FIG. 51, an address format recorded on the wobble 50 will be described. FIG. 51 shows an address format per sector.
The address format is 4 bits as a synchronization pattern.
s, 24 bits as frame address, Reser
This format is provided with 4 bits as ved and 12 bits as ECC. One sector includes Data
Since the area includes 2 kB, the address described above indicates an address for data of 2 kB. Also, one wobble 51 is formed for one byte of data, and 2816 wobbles are formed for one sector.
The 2816 pieces / sector wobble 51 serve as a reference for generating a recording / reproducing clock. Also,
The wobble 51 is one for data 2 bytes,
1408 pieces may be formed for one sector.
With reference to FIG. 52, reproduction of the optical disc in the ninth embodiment will be described. As the reproducing circuit, the reproducing circuit shown in FIG. 24 is used. When the groove 1 (G1) in FIG. 50 is reproduced by a laser beam, the reproduced signal is the signal shown in FIG. This is G
This is because the wobble 50 is formed on one side and the wobble 51 is formed on the other side, so that signals from both wobbles are detected as a reproduced signal in a superimposed form.
Next, when L1 in FIG. 50 is reproduced by a laser beam, since the wobble 51 is formed on one side and the wobble 50 is formed on the other side, the reproduced signal is the signal shown in FIG. The same applies to the case where G2 and L2 in FIG. 50 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. 24, the signal (a) reproduced as a push-pull signal is sent to a BPF 243 which is a narrow-band bandpass filter and a BPF 244 which is a bandpass filter for address demodulation. Only the high frequency components of the reproduction signal sent to the BPF 243 are extracted, and the signal of FIG. 52 (c) is extracted. This signal (c) is a signal corresponding to the wobble 51. The signal (c) extracted by the BPF 243 is sent to the comparator 245. The comparator 245 is
The sent signal (c) is binarized, and the binarized signal is
Come to L246. The PLL 246 generates a data clock from the sent binary signal in accordance with 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 BPF244
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 shown in FIG.
Are sent to the FM demodulation circuit 53 shown in FIG. The PLL 24
The synchronization signal generated by the clock distribution circuit 56
The clock is distributed by the clock distribution circuit 56, and is transmitted to the FM demodulation circuit 53, the Biphase demodulation circuit 54, and the address decoder circuit 55, respectively. F
The M demodulation circuit 53 FM-demodulates the signal (b) sent from the BPF in synchronization with the clock sent from the clock distribution circuit 56, and performs a biphase demodulation circuit 54
Send to The Biphase 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
The address is output in synchronization with the clock transmitted from the clock distribution circuit 56.

In the optical disk shown in the ninth embodiment, a synchronization signal can be accurately generated from a wobble formed on one of the walls of the groove, and the amount of leakage of the wobble into the reproduction signal is small. It is effective as an optical disk. However, in order to further improve the reproduction characteristics, it is possible to apply the erasing circuit for erasing the leakage described in the eighth embodiment.

In the first to ninth 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. Tenth Embodiment A tenth embodiment will be described with reference to FIGS. The magneto-optical recording medium 540 is divided into n zones 541,..., 54n from the inner circumference toward the outer circumference.
, 541m, and m sectors, and the outer peripheral zone 54n includes 54n1, 54n2,
54n3,..., 54nl. The number of sectors in each zone is determined so as to maximize the recording density, irrespective of whether they are the same or not. FIG. 55 is a perspective view of a magneto-optical recording medium according to the tenth embodiment. The magneto-optical recording medium 540 has a groove and a land, and the groove has a groove 551 provided with a wobble 553 on one of the walls, and an area 554 in which the groove 551 is not provided behind the groove 551. This is a structure in which a region in which grooves 555 on which no wobble is provided are alternately formed on both side walls. As a result, the land has a structure in which a land 552 in which the wobble 553 is provided on one of the walls is formed, followed by a region without wobble on both sides. FIG. 56 shows a plan view of the magneto-optical recording medium 540. In plan view, a wobble 553 is formed in one of the groove G and the land L, and an area 55 where no groove is provided behind the wobble 553.
Reference numeral 4 denotes a structure formed repeatedly at regular intervals. The sector 554 includes 43 areas in one sector. Therefore, each of the sectors 5411 and 5412 described in FIG.
5413, 45 areas 554 where no groove is formed are formed, and each sector 5411, 54
12, 5413,... Have a groove 551 provided with a wobble 553 at the head. The length 561 of the area where no wobble is provided on the walls on both sides is 5
The length 562 of the region 554 where no groove is provided is in the range of 0.5 to 4 μm. The length 5 of the area where the wobble 553 is provided is 5
63 is the same as the length 561. Further, the amplitude of the wobble 553 (here, the amplitude refers to a value from peak to peak) is in the range of 60 to 150 nm.

Therefore, in the magneto-optical recording medium 540 according to the tenth embodiment, address information for grooves and lands is recorded on the wobble 553 by biphase modulation, and the areas 554 are formed at regular intervals. It is characterized by. As a result, the wobble 553 includes address information common to lands and grooves located on both sides thereof. Here, the area 554 is used to generate a synchronization signal used for recording or reproducing a signal. The sectors 5411 and 5412 of the magneto-optical recording medium 540;
Since the wobble 553 is not provided until the laser beam reaches the area where 5413,... Are provided, the laser beam detects an area 554 in which a groove that periodically appears is not formed (detection method). The synchronization signal is generated from the detected signal.

In the above description, the wobble is provided on one wall of the groove, but is not limited to this, and may be provided on both walls. In this case, one wobble does not include address information common to the land and the groove, but one wobble includes address information of the land or the groove. The tenth embodiment is not limited to the magneto-optical recording medium, but
Any recording medium having the structure shown in FIG.

Referring to FIG. 57, magneto-optical recording medium 540
An information recording / reproducing apparatus for recording / reproducing a signal to / from a device will be described. First, the recording operation will be described. 650 (allowable error ± 15,
same as below. A) a laser beam having a wavelength of nm is applied to the magneto-optical recording medium 540 to reproduce the area 554 where the groove is not formed, and the reproduced signal and error signal of the area 554 that is optically reproduced are converted into a reproduction signal amplifier circuit; After being sent to 574 and amplified by the reproduction signal amplification circuit 574, the error signal is sent to the servo circuit 575, and the reproduction signal in the area 554 is sent to the synchronization signal generation circuit 577.

Referring to FIG. 58, the optical head 572
The detection of the area 554 by the inner photodetector will be described. The photodetector 580 has four regions A581, B582,
It is divided into C583 and D584. Further, the photodetectors 580 are arranged such that the direction indicated by the arrow 586 is the radial direction and the direction indicated by the arrow 585 is the tangential direction. The reflected light from the magneto-optical recording medium 540 is detected in areas A581, B582, C583, and D584, and the DA of the laser beam intensities DA, DB, DC, and DD detected in the respective areas.
+ DD and DB + DC are input to the adder 587. The adder 587 calculates [DA + DD] + [DB + DC], and outputs the result as a reproduction signal of the area 554 to the terminal 5
The signal is sent to the reproduction signal amplifying circuit 574 via 88. The reproduced signal in the area 554 has a waveform shown in FIG. The waveform (a) is detected regardless of whether the laser beam is traveling in a groove or a land.

Of the error signals, the focus error signal is [DA + DC]-[DB + DD], and the tracking error signal is [DA + DD]-[DB + DC].
Are respectively calculated by a subtractor (not shown) and sent to the reproduction signal amplifier circuit 574. The reproduction signal amplification circuit 574 separates the reproduction signal of the area 554 from the reproduction signal, the tracking error signal, and the focus error signal of the area 554 that has been sent, and converts the reproduction signal of the separated area 554 into a synchronization signal generation circuit. 577, and sends a tracking error signal and a focus error signal to the servo circuit 575.

Referring to FIG. 57, synchronization signal generation circuit 57
Reference numeral 7 generates a synchronizing signal from the reproduction signal of the area 554 sent from the reproduction signal amplifier circuit 574. FIGS. 59 and 6
The generation of the synchronization signal by the synchronization signal generation circuit 577 will be described with reference to FIG. The synchronization signal generation circuit 577 includes a comparator 601, a PLL circuit 602, and a clock generation circuit 603, and the reproduction signal of the area 554 input to the comparator 601 via the terminal 600 (see FIG. 5).
9 (a). ) Are compared by the comparator 601 and are converted into the signal of FIG. After that, the signal of (b) is input to the PLL circuit 602,
The L circuit 602 generates a timing signal (c) synchronized with the rise from the input signal (b). The generated timing signal (c) is transmitted to the clock generation circuit 60.
3, the clock generation circuit 603 generates a synchronization signal (d) having a predetermined frequency, and outputs the synchronization signal (d) of FIG.
, A control circuit 581, and a signal format circuit 586. In the present embodiment, since 68 bytes of data are recorded between the areas 554, it is necessary to generate a synchronization signal corresponding to 544 bits. Therefore, the synchronization signal (d) in FIG. 59 is 544 between the timing signals in (c) in FIG.
Is a signal in which there are synchronizations.

In the above description, the region 554 where no groove is formed is detected by [DA + DD] + [DB + DC], but may be detected by [DA + DD] − [DB + DC]. After the synchronizing signal is generated, the laser beam is applied to each sector 5411, 5411 of the magneto-optical recording medium 540.
, 5413,..., And address information recorded by the wobble 553 at the head of each sector is detected. The address information is recorded by bi-phase modulation with the waveform denoted by reference numeral 610 in FIG. 61 as [1] and the waveform denoted by reference numeral 611 as [0]. Therefore, [101101
0] is a waveform indicated by reference numeral 612. With reference to FIGS. 62, 63, and 64, detection of address information recorded as wobbles will be described. The light detector 580 in the optical head 572 is arranged in the same manner as described with reference to FIG. 58, and its light receiving surface is divided into four regions. The address information recorded by wobble is stored in each area A
Among the intensities DA, DB, DC, and DD detected at 581, B582, C583, and D584, DA + DD and DB + DC are input to the subtractor 630, and are added to the adder 630.
Calculates [DA + DD]-[DB + DC], and sends the result to the reproduction signal amplifier circuit 574 via the terminal 631 as a reproduction signal of the wobble 612. The reproduction waveform of the wobble 612 sent to the reproduction signal amplification circuit 574 is shown in FIG.
2 (e). Reproduction signal amplification circuit 574
Sends the reproduced signal of the transmitted wobble 612 to the address detection circuit 578 shown in FIG. The details of the address detection circuit 578 will be described with reference to FIG.
The address detection circuit 578 includes a comparator 641 and an address decoder 642. The signal (e) input via the terminal 640 is compared by the comparator 641, and the binarized signal shown in FIG. Is converted to The binarized signal (f) is supplied to the address decoder 6.
42, the address decoder 642 reads [1011010] from the binarized signal (f),
Address information is detected. The detected address information is sent to the control circuit 581 in FIG. 57 via the terminal 643.

Referring to FIG. 57, servo circuit 575 includes:
The spindle motor 576 is rotated at a predetermined number of rotations in synchronization with the transmitted synchronization signal (the signal shown in FIG. 59 (d)). To perform tracking servo and focus servo. The control circuit 581 controls the information recording / reproducing device based on the address information input from the address detection circuit 578, and sends a synchronization signal shown in FIG. 59 (d) to the timing setting circuit 583.

The operation of the timing setting circuit 583 will be described. When recording a signal on the magneto-optical recording medium 540, the timing setting circuit 583
2, the timing of irradiating the laser beam generated by the semiconductor laser in the magneto-optical recording medium 540, the first timing pulse for pulsing the laser beam, and the S / N of the pulse magnetic field applied by the magnetic head 570 A second timing pulse for determining the switching duty and timing is generated based on the synchronization signal sent from the control circuit 581. The timing setting circuit 583
First and second timing pulses are generated based on the synchronization signal of FIG. 59 (d), and the first timing pulse is dut.
The second timing pulse is sent to the y correction circuit 582 and to the magnetic head drive circuit 571, respectively. Here, the first timing pulse is equal to S of the second timing pulse.
At the time of / N switching, the laser light is not turned on. This is because when the magnetic field is switched from the S pole to the N pole, a certain transition time exists, so that even if the laser is irradiated on the magneto-optical recording medium at this timing, the signal cannot be accurately recorded. is there.

Further, the signal format circuit 586
Formats the recording data in synchronization with the synchronization signal sent from the synchronization signal generation circuit 577, and sends it to the magnetic head drive circuit 571. Also, the magnetic head drive circuit 571
Calculates the logical sum of the second timing pulse sent from the timing setting circuit 583 and the recording signal sent from the signal format circuit 586, and drives the magnetic head 570 based on the calculation result. Record the signal. Further, the duty correction circuit 582 outputs the first timing pulse sent from the timing setting circuit 583 to the first timing pulse.
A predetermined duty for turning on / off the laser beam is added and sent to the laser driving circuit 573, and the laser driving circuit 5
Reference numeral 73 drives the semiconductor laser in the optical head 572 at a predetermined duty based on the sent first timing pulse to which the predetermined duty is added, to generate a pulsed laser beam.

Next, the reproducing operation will be described. A laser beam having a wavelength of 650 nm is irradiated on the magneto-optical recording medium 540 by the optical head 572, and the area 554 and the recording signal are reproduced in the same manner as when recording a signal. Error signal,
The wobble reproduction signal and the reproduction signal are sent to the reproduction signal amplification circuit 574 and amplified by the reproduction signal amplification circuit 574. Then, the error signal is transmitted to the servo circuit 575, the reproduction signal is transmitted to the low-pass circuit 579, and the reproduction of the area 554 is performed. The signal is sent to the synchronization signal generation circuit 577, and the wobble reproduction signal is sent to the address detection circuit 578. The operations of the synchronizing signal generation circuit 577 and the address detection circuit 578 are the same as those at the time of recording, and a description thereof will be omitted.

The operation of the servo circuit 575 is the same as that at the time of recording, and a description thereof will be omitted. The control circuit 581 controls the information recording / reproducing device based on the address information input from the address detection circuit 578, and (d) of FIG.
The synchronization signal shown in FIG.
/ D converter 42. Since a magnetic field is not applied to the magneto-optical recording medium 540 during signal reproduction, the timing setting circuit 583 irradiates a laser beam generated by a semiconductor laser onto the magneto-optical recording medium 540 and a pulse for pulsing the laser beam. One timing pulse is generated based on the synchronization signal sent from the control circuit 581, and the generated first timing pulse is sent to the duty correction circuit 582. The duty correction circuit 582 adds a predetermined duty for turning on / off the laser beam to the first timing pulse sent from the timing setting circuit 583, and sends the first timing pulse to the laser drive circuit 573. The laser drive circuit 573 sends the first timing pulse. Driving the semiconductor laser in the optical head 572 at a predetermined duty based on the first timing pulse to which the predetermined duty has been added;
Generate a pulsed laser beam.

The low-pass circuit 579 removes high frequency component noise of the reproduction signal sent from the reproduction signal amplification circuit 574 and sends it to the A / D converter 580. A /
The D converter 580 performs A / D conversion in synchronization with the synchronization signal sent from the control circuit 581, and sends the A / D converted to the high-pass filter 584. The high-pass filter 584 removes low-frequency noise caused by birefringence of the disc and the like, and converts the reproduced signal into a PRML (Partial Response) signal.
Maximum Likely circuit) circuit 58
Send to 5. The PRML circuit 585 performs three-valued determination on the reproduced signal, and demodulates the reproduced signal with less errors.

In the magneto-optical recording medium according to the tenth embodiment, no wobbles are formed on the walls on both sides of the groove in the area for recording or reproducing signals.
The polarization direction of the light reflected by the groove is affected by the wobble, and there is no leakage that the influence appears in the reproduction characteristic, and the reproduction characteristic is good. In addition, since the area where the groove for generating the synchronization signal is not provided is provided every 68 bytes, the synchronization signal can be reliably generated, and the characteristics in recording or reproducing the signal can be improved. Can be.

In the tenth embodiment,
In order to generate a synchronization signal, a region where no groove is formed periodically is provided in the groove of the magneto-optical recording medium. However, the present invention is not limited to this. For a recording medium in which reflected light of a laser beam periodically changes. Anything is fine.

[0131]

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, a signal can be recorded / reproduced 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 synchronization 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 for 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.

Further, 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, 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 wobbles are formed on the walls 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 block diagram showing an address detection part in an optical disc recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a format of a disc in the optical disc recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 3A is a schematic diagram illustrating grooves and lands engraved on a disc in an optical disc recording / reproducing apparatus according to a first embodiment of the present invention, and FIG. (B) showing the relationship between the beam spot and the address information when the beam spot is turned on, and (c) showing the relationship between the beam spot and the address information when the beam spot is controlled to the center of the land in the optical disc recording / reproducing apparatus. It is.

FIG. 4 is a schematic diagram showing a pattern of an address mark having two patterns.

FIG. 5 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.

FIG. 6 is a schematic diagram showing grooves and lands formed on a disk according to a second embodiment.

FIG. 7 is a diagram showing a disc format according to the second embodiment.

FIG. 8 is a diagram showing wobbling patterns in address segments and clocking wobbles.

FIG. 9 is a diagram illustrating an optical disc recording / reproducing apparatus according to a second embodiment.

FIG. 10 is a diagram illustrating a structure of an optical disc according to a third embodiment.

FIG. 11 is a diagram showing a land / groove structure according to a fourth embodiment.

FIG. 12 is a diagram showing a reproduction waveform of a fine clock mark provided in a groove.

FIG. 13 is a diagram illustrating a recording / reproducing apparatus for an optical disc according to a fourth embodiment.

FIG. 14 is a diagram illustrating a land / groove structure according to a fourth embodiment.

FIG. 15 is a diagram illustrating a land / groove structure according to a fourth embodiment.

FIG. 16 is a diagram showing a land / groove structure according to a fourth embodiment.

FIG. 17 is a diagram illustrating a land / groove structure according to a fifth embodiment.

FIG. 18 is a diagram illustrating a method of generating a synchronization signal from a reproduced wobble waveform.

FIG. 19 is a diagram showing another land / groove structure according to the fifth embodiment.

FIG. 20 shows still another land / land according to the fifth embodiment.
It is a figure showing a groove structure.

FIG. 21 shows still another land / land according to the fifth embodiment.
It is a figure showing a groove structure.

FIG. 22 shows still another land / land according to the fifth embodiment.
It is a figure showing a groove structure.

FIG. 23 shows still another land / land according to the fifth embodiment.
It is a figure showing a groove structure.

FIG. 24 is a diagram illustrating processing of a reproduction signal from an optical disc in the fifth embodiment.

FIG. 25 is a diagram showing a disk format according to a fifth embodiment.

FIG. 26 is a diagram showing an address format according to the fifth embodiment.

FIG. 27 is a diagram illustrating a device block that generates a synchronization signal from a wobble signal according to the fifth embodiment.

FIG. 28 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 a fifth embodiment.

FIG. 29 is a diagram illustrating a relationship between crosstalk and a wobble length according to the fifth embodiment.

FIG. 30 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 fifth embodiment.

FIG. 31 is a diagram illustrating a land / groove structure according to a sixth embodiment.

FIG. 32 is a diagram showing another land / groove structure according to the sixth embodiment.

FIG. 33 is a diagram showing a disk format according to the sixth embodiment.

FIG. 34 is a diagram showing an address format according to the sixth embodiment.

FIG. 35 is a diagram for explaining that wobbles provided on both sides of a groove adversely affect a reproduced signal component.

FIG. 36 is a diagram illustrating a wobble structure according to a seventh embodiment.

FIG. 37 shows wobble wavelengths according to the seventh embodiment;
5 is a chart showing a relationship between an amplitude h and a leakage amount.

FIG. 38 shows wobble wavelengths according to the seventh embodiment;
5 is a chart showing a relationship between an amplitude h and an error rate.

FIG. 39 is a diagram showing a planar structure of a magneto-optical recording medium according to an eighth embodiment.

FIG. 40 is a block diagram of an erase circuit according to a first erase method in the eighth embodiment.

FIG. 41 is a diagram illustrating signals according to a first erasing method according to the eighth embodiment.

FIG. 42 is a diagram showing an erase circuit according to a second erase method in the eighth embodiment.

FIG. 43 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 eighth embodiment.

FIG. 44 is a diagram showing another planar structure of the magneto-optical recording medium according to the eighth embodiment.

FIG. 45 is a block diagram of an erase circuit according to a third erase method in the eighth embodiment.

FIG. 46 is a diagram showing signals according to a third erasing method in the eighth embodiment.

FIG. 47 is a block diagram of an erase circuit according to a fourth erase method in the eighth embodiment.

FIG. 48 is a diagram illustrating signals according to a fourth erase method in the eighth embodiment.

FIG. 49 is a diagram illustrating signals for describing signal processing according to a fifth erasing method in the eighth embodiment.

FIG. 50 is a diagram showing a planar structure of an optical disc in a ninth embodiment.

FIG. 51 is a diagram illustrating an address format recorded on an optical disc in the ninth embodiment.

FIG. 52 is a diagram illustrating a wobble reproduction signal according to the ninth embodiment.

FIG. 53 is a circuit diagram illustrating reproduction of address information according to a ninth embodiment.

FIG. 54 is a plan view of a magneto-optical recording medium according to a tenth embodiment.

FIG. 55 is a perspective view illustrating the structure of lands and grooves of a magneto-optical recording medium according to a tenth embodiment.

FIG. 56 is a plan view illustrating a structure of lands and grooves of a magneto-optical recording medium according to a tenth embodiment.

FIG. 57 is a block diagram of an information recording / reproducing apparatus for recording / reproducing a magneto-optical recording medium according to a tenth embodiment.

FIG. 58 is a diagram illustrating detection of an area where no groove is provided.

FIG. 59 is a diagram illustrating a change in a signal for generating a synchronization signal.

FIG. 60 is a block diagram of a synchronization signal generation circuit according to a tenth embodiment.

FIG. 61 is a diagram illustrating a method of recording address information according to the tenth embodiment.

FIG. 62 is a diagram illustrating signal changes for describing reproduction of address information according to the tenth embodiment.

FIG. 63 is a diagram illustrating detection of address information according to the tenth embodiment.

FIG. 64 is a block diagram of an address detection circuit according to a tenth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Groove 2 ... Land 3 ... Groove pit 4 ... Land pit 5 ... Main spot 6 ... Front sub spot 7 ... Back sub spot 8 ... Main detector 9 Front sub-detector 10 Back sub-detector 11 Differential amplifier 12 Differential amplifier 13 Differential amplifier 14 Non-inverting addition amplifier 15 ..Differential amplifier 16 ... Inverting amplifier 17 ... Amplifier 18 ... Bandpass filter 19 ... Comparator 20 ... Inverting addition amplifier 39,440 ... Magneto-optical recording medium 40,43,45 , 46, 48, 421, 424, 45
0, 452, 454, 470, 476 ... terminal 41 ... BPF 42 ... PLL 44 ... correction signal generation circuit 47, 453, 475 ... subtractor 50, 51 ... wobble 53 .. FM demodulation circuit 54 Biphasic demodulation circuit 55 address decoder circuit 56 clock distribution circuit 391 outer circumference 392 inner circumference 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-Synchronization Detection circuit 473 ・ ・ ・ Adder

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 11/10 586 G11B 11/10 586C // G11B 7/09 7/09 C (31) Claimed priority number Japanese Patent Application No. Hei 8- 301426 (32) Priority Date Hei 8 (1996) November 13 (33) Priority Country Japan (JP) (31) Priority Claim Number Japanese Patent Application No. 9-6988 (32) Priority Date Hei 9 (1997) 1 March 17 (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-12790 (32) Priority date Hei 9 (1997) January 27 (33) Priority claim country Japan ( JP) (31) Priority claim number 9-25655 (32) Priority date Hei 9 (1997) February 7 (33) Priority claim country Japan (JP) (31) Priority claim number 9-56681 (32) Priority date Hei 9 (1997) March 11 (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-95700 (32) Priority date 9 (1997) April 14 (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-106368 (32) Priority date Hei 9 (1997) April 23 (33) Priority Claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-109436 (32) Priority date Hei 9 (1997) April 25 (33) Priority claiming country Japan (JP) (31) Priority Claim No. 9-140087 (32) Priority date Hei 9 (1997) May 29 (33) Country claiming priority Japan (JP) (72) Inventor Koji Uchihara 2-chome Keihanhondori, Moriguchi-shi, Osaka 5-5 Sanyo Electric Co., Ltd. (72) Inventor Satoshi Sumi 2-5-5 Sanyo Electric Co., Ltd., Moriguchi City, Osaka (72) Inventor Kenji Nakao Keihan Motodori, Moriguchi City, Osaka Prefecture 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Toshiaki Hioki 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Hisashi Matsuyama Keihan Moriguchi, Osaka 2-5-5 Hondori Sanyo Electric Co., Ltd. (72) Inventor Hori Yoshihiro 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (98)

[Claims] 1. A recording medium including address information in a groove or a land. 2. The recording medium according to claim 1, wherein said recording medium is an optical recording medium. 3. The recording medium according to claim 1, wherein said recording medium is a magneto-optical recording medium. 4. The recording medium according to claim 1, wherein said recording medium is a magneto-optical recording medium based on magnetic domain expansion. 5. The recording medium according to claim 2, wherein the address information includes information for a groove and information for a land. 6. The recording medium according to claim 5, wherein the groove address and the land address are formed continuously. 7. The recording medium according to claim 6, wherein said address information is recorded in a groove. 8. The recording medium according to claim 7, wherein one address is common to address information of an adjacent groove. 9. The recording medium according to claim 8, further comprising an address mark for identifying a groove address and a land address. 10. The recording medium according to claim 9, wherein said address mark is formed following a groove address and a land address. 11. The recording medium according to claim 1, wherein the address information is recorded as wobbles. 12. An optical disk capable of recording and / or reproducing information on and from a land and a groove, wherein the groove includes first address information formed as a wobble, and the land is provided on grooves located on both sides of the land. An optical disc characterized in that the obtained wobble includes second address information having the same waveform. 13. An optical disk capable of recording and / or reproducing on and from a land and a groove, wherein adjacent grooves include wobbles having the same waveform. 14. An optical disk capable of recording and / or reproducing data on and from a land and a groove, wherein the groove includes first address information formed as a wobble, and the land is provided on a groove located on both sides of the land. An optical disc, wherein the obtained wobble includes second address information having the same waveform, and a wobble is also provided in a data recording area of the groove or the land. 15. An optical disc capable of recording and / or reproducing information on and from a land and a groove, wherein the groove includes first address information formed as wobbles and TOC information formed as wobbles or pit strings, An optical disc, wherein the land includes second address information in which wobbles provided on grooves located on both sides of the land have the same waveform, and TOC information formed as a pit row. 16. An optical disc capable of recording and / or reproducing data on and from lands and grooves, wherein the grooves include first address information formed as wobbles and TOC information formed as wobbles or pit strings. The land includes second address information in which wobbles provided on grooves located on both sides of the land have the same waveform, and TOC information formed as a pit row, and a data recording area of the groove or the land. An optical disc characterized by having a wobble. 17. The optical disc according to claim 12, wherein a frequency of the wobble is in a range of 200 kHz to 10 MHz. 18. The optical disk according to claim 12, wherein a width of the groove and a width of the land are the same. 19. The optical disk according to claim 12, wherein said grooves include fine clock marks at predetermined intervals. 20. The optical disk according to claim 19, wherein the fine clock mark is provided as a wobble. 21. The optical disk according to claim 19, wherein the predetermined interval is in a range of 50 to 300 μm. 22. An optical disk capable of recording and / or reproducing on and from a land and a groove, wherein a wobble is provided on one of the walls of the groove, and another wobble for a fine clock mark is provided on at least one of the walls of the groove. An optical disc having wobbles. 23. An optical disk capable of recording and / or reproducing information on and from a land and a groove, wherein a wobble including address information for the land and the groove is provided on one of the walls of the groove, and a wobble including the address information is provided. An optical disk characterized in that another wobble for a fine clock mark is provided on at least one wall of the groove in an area other than the area where the groove is formed. 24. The wobble for the fine clock mark according to claim 22 or 23,
An optical disk provided at intervals of up to 300 μm. 25. The method according to claim 20, wherein a ratio between a wobble interval for the fine clock mark and a length of a region where the wobble for the fine clock mark is provided is 1/300 to 1/50. An optical disk characterized by being a range. 26. An optical disc capable of recording and / or reproducing information on and from a land and a groove, wherein at least one wall of the groove includes a first wobble including address information for the land and the groove, and at least one wall of the groove. An optical disk characterized by further comprising a second wobble. 27. An optical disk capable of recording and / or reproducing data on and from a land and a groove, wherein a first wobble including land and groove address information is provided on at least one wall of the groove, and the wobble including the address information is provided. In a region other than the region where the groove is provided, at least one wall of the groove
An optical disc characterized by comprising a wobble. 28. The optical disk according to claim 26, wherein the first wobble includes a first waveform and a second waveform different from the first waveform. 29. An optical disc apparatus for recording and / or reproducing information on / from a recordable / reproducible optical disc comprising lands and grooves, an optical means for guiding one laser beam to the optical disc, and a laser beam for applying the laser beam to the land center or the groove center. An optical disk device comprising: control means for guiding the optical disk; and detection means for detecting a signal from the optical disk. 30. An optical disc apparatus for recording and / or reproducing information on / from a recordable / reproducible optical disc comprising a land and a groove, comprising: an optical unit for guiding one laser beam to the optical disc; and an optical unit provided on both sides of the land or the groove. Detecting means for detecting the detected fine clock mark, an offset for detecting peaks of the two detected fine clock marks, calculating a difference between two detected peak intensities, and adding the calculated result to a tracking error signal. An optical disc device including a correction circuit. 31. An optical disc device for recording and / or reproducing data on / from a recordable / reproducible optical disc comprising a land and a groove and including a first wobble and a second wobble on at least one wall of the groove, Optical means for guiding the two laser beams to the optical disk; detecting means for detecting the second wobble; detecting a point in time at which the wobble waveform detected by the detecting means crosses the base axis from bottom to top; Optical signal device, comprising: a synchronization signal generation circuit that generates a synchronization signal for the device. 32. A recording medium capable of recording and / or reproducing data on and from a land and a groove, wherein a wobble including address information for the land and the groove is provided on one of walls of the groove, and the wobble including the address information is provided. A recording medium, wherein a wobble of a fixed wavelength is provided on both sides of the groove in a region other than the provided region. 33. A recording medium recordable and / or reproducible on a land and a groove, wherein a first wobble modulated by land and groove address information is provided on one of the walls of the groove. In an area other than the area where one wobble is provided,
A recording medium, wherein second wobbles having a fixed wavelength are provided on both sides of the groove. 34. A recording medium in which an equal width groove is formed in parallel with a land therebetween and at least one wall of the equal width groove is wobbled in the width direction of the groove to form an address information block. A wobble including address information for lands and grooves is provided, and another wobble is provided on walls on both sides of the groove in an area other than the address information block. 35. A recording medium in which an equal-width groove is formed in parallel with a land therebetween and at least one wall of the equal-width groove is wobbled in the width direction of the groove to form an address information block. Is formed by a first wobble, and an area other than the address information block is formed by a second wobble. 36. The recording medium according to claim 33, wherein a wavelength of the first wobble is shorter than a wavelength of the second wobble. 37. A recording medium capable of recording and / or reproducing on and from a land and a groove, wherein a wobble of a fixed wavelength is formed continuously with the groove having the same width, and modulated on one wall of the groove by address information. A recording medium characterized by forming wobble intermittently at predetermined intervals. 38. The recording medium according to claim 37, wherein a wavelength of the modulated wobble is shorter than the fixed wavelength. 39. The recording medium according to claim 32, wherein fixed-cycle synchronization information is formed prior to the address information. 40. A recording medium in which an equal width groove is formed in parallel with a land therebetween and the equal width groove is wobbled in the width direction of the groove to form an address information block. The address information block is formed so as to be aligned in the width direction of the groove, and the address information block has a first address common to an address of a groove adjacent to one side, and a common address common to an address of a groove adjacent to the other side. And a second address. 41. The recording medium according to claim 40, wherein the recording medium is recorded optically or magneto-optically. 42. The recording medium according to claim 40, wherein the recording medium is a disk in which the equal-width grooves are formed concentrically or spirally. 43. The recording medium according to claim 40, wherein said address information block includes an address mark specifying one of said first address and said second address. 44. The recording medium according to claim 43, wherein the address marks are formed in a row in the width direction of adjacent grooves. 45. The recording medium according to claim 44, wherein adjacent address marks are formed with phases opposite to each other. 46. The recording medium according to claim 40, wherein fixed period synchronization information is formed prior to the first address or the second address. 47. The recording medium according to claim 32, wherein the address information block is formed alternately with a data recording block. 48. The recording medium according to claim 46, wherein the equal-width grooves of the data recording block are wobbled at regular intervals. 49. The recording medium according to claim 48, wherein the equal width grooves of the address information block are formed with a shorter period than the equal width grooves of the data block. 50. The wobbling cycle of the same width groove of the address information block is in a range of 1.20 to 5.0 μm, and the wobbling cycle of the same width groove of the data block is 5 μm. A recording medium having a size in a range of from 50 μm to 50 μm. 51. The wobbling cycle of the same width groove of the address information block is in the range of 1.60 to 1.76 μm, and the wobbling cycle of the same width groove of the data block is 5 A recording medium having a size in a range of from 50 μm to 50 μm. 52. The wobbling cycle of the same width groove of the address information block is in a range of 1.20 to 5.0 μm, and the wobbling cycle of the same width groove of the data block is 10 to 50 μm. A recording medium having a size in a range of from about 32 μm to about 32 μm. 53. The wobbling cycle of the same width groove of the address information block is in a range of 1.60 to 1.76 μm, and the wobbling cycle of the same width groove of the data block is 10 or more. A recording medium having a size in a range of from about 32 μm to about 32 μm. 54. The wobbling period of the same width groove of the address information block is in a range of 1.20 to 5.0 μm, and the wobbling period of the same width groove of the data block is 15 or more. A recording medium having a size in a range of from 25 μm to 25 μm. 55. The wobbling cycle of the same width block of the address information block is in the range of 1.60 to 1.76 μm, and the wobbling cycle of the same width groove of the data block is 15 A recording medium having a size in a range of from 25 μm to 25 μm. 56. The apparatus according to claim 50, wherein the wobbling amplitude of the address information block is ±
A recording medium having a range of 15 to 70 nm. 57. The wobbling amplitude of the address information block according to any one of claims 50 to 55, wherein:
A recording medium having a range of 25 to 70 nm. 58. The wobbling amplitude of the address mark portion according to claim 50, wherein the wobbling amplitude of the address mark portion is ± 15.
A recording medium characterized by being in the range of ± 35 nm. 59. The apparatus according to claim 50, wherein the wobbling amplitude of the address mark portion is ± 30.
A recording medium having a range of about ± 150 nm. 60. The wobbling amplitude of the address mark portion according to claim 50, wherein the wobbling amplitude is ± 60.
A recording medium having a range of about ± 120 nm. 61. The wobbling amplitude of the address mark portion according to claim 50, wherein the wobbling amplitude is ± 70.
A recording medium having a range of about ± 120 nm. 62. The method according to claim 50, wherein the wobbling amplitude of the data portion is ± 10 to ± 60.
A recording medium having a range of nm. 63. The wobbling amplitude of the data part according to any one of claims 50 to 61,
A recording medium having a range of nm. 64. The method according to claim 50, wherein the wobbling amplitude of the data portion is ± 15 to ± 35.
A recording medium having a range of nm. 65. The apparatus according to claim 48, wherein the equal width groove of the address information block is wobbled with address information and wobbled in the same cycle as the data recording block. Recording medium. 66. An apparatus according to claim 32, wherein the amplitude of the wobble forming the address information is ± 15.
A recording medium having a range of about ± 150 nm. 67. The apparatus according to claim 32, wherein the amplitude of the wobble forming the address information is ± 25.
A recording medium having a range of about ± 90 nm. 68. The apparatus according to claim 32, wherein the amplitude of the wobble of the address mark portion is ± 30 to ± 30.
A recording medium having a range of 200 nm. 69. The method according to claim 32, wherein the amplitude of the wobble of the address mark portion is ± 60 to ± 60.
A recording medium having a range of 150 nm. 70. The wobbling period of the same width groove of the address information block is in a range of 1.20 to 5.0 μm, and the wobbling period of the same width groove of the data block is 0. A recording medium having a size in the range of 0.8 to 10 μm, 1.2 to 5.0 μm, or 1.6 to 3.0 μm. 71. The wobbling cycle of the same width groove of the address information block is in a range of 1.60 to 1.20 μm, and the wobbling cycle of the same width groove of the data block is 0. A recording medium having a size in the range of 0.8 to 10 μm, 1.2 to 5.0 μm, or 1.6 to 3.0 μm. 72. The wobbling amplitude of an equal width groove of the data block is 5 to 25, or 5 to 20, or 7
A recording medium having a thickness in the range of 14 nm to 14 nm. 73. A correction for eliminating leakage of a reproduction signal in a recording medium in which an equal width groove is formed in parallel with a land therebetween and the equal width groove is wobbled in the width direction of the groove to form an address information block. A recording medium characterized in that a TOC area containing information on an amount is provided on an inner peripheral portion and / or an outer peripheral portion of the recording medium. 74. A recording medium in which equal-width grooves are formed in parallel with a land therebetween and the equal-width grooves are wobbled in the width direction of the grooves to form an address information block. (A) a specific area in which a signal of a predetermined format which is equal to a reproduced signal in which a magneto-optical signal is erased is recorded; and (b) a signal area in which a signal is recorded subsequent to the specific area is provided in large numbers. Characteristic recording medium. 75. An equal-width groove is formed in parallel with a land therebetween, and the equal-width groove is wobbled in the width direction of the groove to form an address information block and information on a correction amount for eliminating leakage of a reproduction signal. T including
In an optical disc device for recording and / or reproducing an OC area on a recording medium provided on an inner peripheral portion and / or an outer peripheral portion of the recording medium, the optical disc device is provided on a wall of the groove based on the correction amount reproduced by optical means. An optical disc device, comprising: a correction signal generation circuit that generates a correction signal in which the phase and amplitude of a wobble are corrected; and a subtractor that subtracts a correction signal generated by the correction signal generation circuit from a reproduction signal. 76. An equal-width groove is formed in parallel with a land therebetween, and the equal-width groove is wobbled in the width direction of the groove to form an address information block, and information on a correction amount for eliminating leakage of a reproduction signal. T including
In an optical disc device for recording and / or reproducing an OC area on a recording medium provided on an inner peripheral portion and / or an outer peripheral portion of the recording medium, a range of a correction amount to be changed based on the correction amount reproduced by an optical unit is set. A correction amount generation circuit to be determined, a subtractor for subtracting each correction amount determined by the correction signal generation circuit from the reproduction signal, and a reproduction signal from the subtractor being input, and detecting an error rate for each correction amount. And an error rate detection circuit for detecting a reproduced signal corresponding to a correction amount at which the error rate is minimized. 77. An equal-width groove is formed in parallel with a land therebetween, and the equal-width groove is wobbled in the width direction of the groove to form an address information block, and a signal recording area of the recording medium includes: A specific area in which a signal of a predetermined format equal to the reproduced signal from which the magneto-optical signal has been erased is recorded, and (b) a signal area in which a signal is recorded subsequent to the specific area is recorded on a recording medium provided in a large number. And / or an optical disc device for reproducing, wherein a waveform memory for storing a reproduced signal obtained by reproducing a signal of a predetermined format recorded in the specific area, a reproduced signal is inputted to one terminal and synchronized with the input of the reproduced signal. Input the reproduction signal of the signal of the predetermined format from the waveform memory to the other terminal, and input the reproduction signal of the predetermined format from the reproduction signal. Comprising a subtractor for subtracting the reproduction signal, the optical disk apparatus. 78. An optical disk apparatus for recording and / or reproducing information on and from a recording medium on which an address information block is formed by forming equal-width grooves in parallel with a land therebetween and wobbling the equal-width grooves in the width direction of the grooves. An A / D converter for performing A / D on a reproduction signal; a synchronous detection circuit for receiving a signal from the A / D converter and detecting a signal corresponding to one wavelength of a wobble provided in the groove; An adder for averaging the reproduction signal by adding the signal from the synchronous detection circuit a predetermined number of times; a waveform memory for storing the reproduction signal averaged by the adder; and a reproduction from the A / D converter. An optical disc device, comprising: a subtractor that inputs a signal and an averaged reproduction signal from the waveform memory, and subtracts the averaged reproduction signal from the reproduction signal. 79. An optical disc capable of recording and / or reproducing information on and from a land and a groove, wherein the groove comprises: (a) a first wobble having a first frequency provided on one of the walls; A) a second wobble having a second frequency different from the first frequency provided on a wall different from the wall provided with the first wobble. 80. The optical disk according to claim 79, wherein said first wobble includes address information. 81. The apparatus according to claim 79, wherein the second wobble includes clock reproduction information.
Optical disk according to item 0. 82. A recording medium in which the intensity of light reflected from a groove or a land changes periodically. 83. The recording medium according to claim 82, wherein the groove or the land includes address information. 84. The recording medium according to claim 82, wherein said recording medium is an optical recording medium. 85. The recording medium according to claim 82, wherein said recording medium is a magneto-optical recording medium. 86. The recording medium according to claim 82, wherein the recording medium is a magneto-optical recording medium based on magnetic domain expansion.
3. The recording medium according to 3. 87. The recording medium according to claim 84, wherein said address information is information common to a groove and a land. 88. The recording medium according to claim 82, wherein said address information is recorded in wobble. 89. The recording medium according to claim 88, wherein said wobble is formed on at least one wall of the groove. 90. In a recording medium capable of recording and / or reproducing data on and from a land and a groove, a wobble including address information for the land and the groove is provided on one of the walls of the groove, and a wobble including the address information is provided. A recording medium in which, in an area other than the area where the groove is formed, an area where no groove is provided periodically exists. 91. The recording medium according to claim 90, wherein said address information is recorded by a bi-phase modulation method. 92. An interval between regions where no groove is provided is in a range of 50 to 150 μm.
Or the recording medium of 91. 93. The recording medium according to claim 90, wherein the width of the region where no groove is provided is in the range of 0.5 to 4 μm. 94. The amplitude of the wobble is 60 to 150.
The recording medium according to any one of claims 90 to 93, wherein the recording medium has a range of nm. 95. A wobble including land and groove address information is provided on one of the walls of the groove, and the wobble including the address information is provided in an area other than the area provided with the wobble including the address information. An information recording / reproducing apparatus for recording and / or reproducing information on / from a recording medium in which a region not provided with a laser beam periodically exists, a magnetic head for applying a magnetic field to the recording medium, and an optic for irradiating the recording medium with a laser beam. Means, a synchronization signal generation circuit for generating a synchronization signal from a reproduction signal reproduced by the optical means, and control for controlling the optical means and the magnetic head based on the synchronization signal generated by the synchronization signal generation circuit. An information recording / reproducing apparatus including a circuit. 96. The information recording / reproducing apparatus according to claim 95, wherein the synchronizing signal generating circuit generates a synchronizing signal based on a reproducing signal from an area other than an area including the address information. 97. A comparator for binarizing a reproduction signal reproduced by the optical means, a PLL circuit for generating a timing pulse from the signal binarized by the comparator, the PLL, The information recording / reproducing apparatus according to claim 96, further comprising: a clock generation circuit that generates a synchronization signal including a predetermined clock based on the timing pulse generated by the circuit. 98. A photodetector in said optical means, having a light receiving surface comprising a first area, a second area, a third area, and a fourth area, wherein said first, second, A reproduction signal is obtained from an area other than the area including the address information by calculating the sum of the reflected light intensities of the laser beams detected in the third and fourth areas on the recording medium. An information recording / reproducing apparatus according to claim 97.