JPH11250462A - Optical disk, optical disk recording/reproducing device, its method, and optical disk original disk manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain high density recording by using an address area also as a data area in a disk capable of recording data in both of a land and a groove. SOLUTION: In an optical disk 1 forming the width of a groove 2 and that of a land 3 respectively as fixed values and having a track to be wobbled in a radial direction at a fixed frequency when the disk 1 is rotated by a CAV, the existence of wobbles in one of the right and left sidewalls of the track is allowed to correspond to the data bit of address information and the other is continuously wobbled, so that address information is synchronously demoduated in both of the land 3 and the groove 2 and stably obtained. Thereby CLV control can be executed and data can be recorded/reproduced at high density. In the case of forming spindle rotation control and address information by wobbling the track, the wobble frequency is fixed at the time of rotating the disk 1 at a fixed angular velocity, the existence of wobbles on one of the right and left sidewalls of the track is allowed to correspond to the data bit of address information and a wobble on the other sidewall is continuously formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recordable optical disk in which pre-grooves are wobbled and spindle rotation control information and address information are recorded. The present invention relates to an optical disk recording / reproducing apparatus for recording and reproducing data at high density, an optical disk recording / reproducing method, and an optical disk master manufacturing apparatus for manufacturing a master of the optical disk.

[0002]

2. Description of the Related Art When data is recorded on a disc, it is necessary to record address information on the disc in advance so that the data can be recorded at a predetermined position. This address information is stored in the CD-R's ATIP (Absolute Time).
In some cases, a track is wobbled and recorded in correspondence with frequency-modulated address information as in In Pregroove.

That is, as shown in FIG. 9, a track for recording data is formed in advance as a pre-groove g, and the side wall w of the pre-groove g is wobbled (meandering) in accordance with frequency-modulated address information. Let it do). In this way, the address information can be read from the wobbling, and data can be recorded at a desired track position on the disk D.

[0004]

However, when an address is recorded by wobbling by frequency modulation as described above, it is possible to accurately read the address when recording data on this pre-groove track. , Data can be recorded at an accurate position. However, when the land track is scanned, the wobbling signals of the left and right groove tracks adjacent to the land track are combined, so that there is a problem that it is difficult to correctly reproduce the wobbling corresponding to the scanning of the land track. . As a result, rotation control information and address information for rotating the disk D cannot be read, and there is a problem that it is difficult to record data on a land track.

As one method for solving this problem, Japanese Unexamined Patent Publication No. Hei 9-231580 discloses a method in which a synchronization signal serving as a reference for a rotation control signal is recorded by wobbling, and address information is formed by prepits. The information recording area is divided into a plurality of zones in the radial direction, and the groove wobbles in the radial direction at a predetermined frequency according to each zone when the recording medium is rotated at a constant angular velocity in each of the plurality of zones. By setting the spatial frequency of the wobble to be substantially constant for each zone, a single frequency wobble can be correctly reproduced even on a land track. The address information can be obtained from both the land and the groove if the address information is previously carved as a pre-pit on the boundary between the land and the groove.

However, in this method, as shown in an enlarged view of a main part conceptually showing a disk form in FIG.
The dedicated area ID of the address pit is required, and the recording data is further divided.
A VFO (Variable Frequency Oscillater) is provided after the address pit area (at the head of data) so that L can be easily synchronized.
) Is required, and the substantial recording capacity of the disk is reduced.

Therefore, in a disk for recording data on both lands and grooves, it is necessary to physically separate the address area and the data area, and there is a problem that it is difficult to perform high-density recording.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and enables a high-density recording by using both an address area and a data area on a disk for recording data on both lands and grooves. It is to be.

[0009]

As means for achieving the above object, the present invention provides an optical disk, an optical disk recording / reproducing apparatus, an optical disk recording / reproducing method, and an optical disk master manufacturing apparatus having the following constitution.

(1) As shown in FIG. 1, an optical disk formed by wobbled a track for recording data, wherein the groove width and the inter-groove width of the track are substantially constant, and the wobble is A first wobble formed at both ends of the track so as to obtain a substantially constant frequency when the optical disk is rotated at a constant angular velocity, and a first wobble formed continuously at one end of the track, and address information. The second end formed at the other end with a displacement amount corresponding to
An optical disc characterized by comprising a wobble.

(2) As shown in FIG. 7, the optical disk according to claim 1, wherein the address information of the second wobble is at least track information and angle information indicating a position of the track on the optical disk. An optical disc characterized by including:

(3) As shown in FIG. 8, in the optical disk according to claim 1, the address information of the second wobble is at least a sector address indicating a position of the track on the optical disk. An optical disc characterized in that the period of the sector address is substantially constant in the radial direction of the optical disc.

(4) As shown in FIG. 5, an optical disk recording / reproducing apparatus for recording / reproducing data on / from an optical disk according to any one of claims 1, 2 and 3, wherein the apparatus rotates at a constant linear velocity. Detecting means for detecting a wobbling signal corresponding to the wobble from a recording / reproduction signal obtained by performing recording / reproduction scanning on the read optical disc; extracting a first wobble signal corresponding to the first wobble from the wobbling signal; Wobbling signal extracting means for extracting a second wobble signal corresponding to the second wobble from the wobbling signal using the extracted first wobble signal, and the address information based on the second wobble signal. An optical disk, comprising: address information reading means for reading an optical disk; and rotating the optical disk based on the address information. Recording and playback device.

(5) An optical disc recording / reproducing method for recording / reproducing data on / from an optical disc according to any one of claims 1, 2 and 3, wherein the recording / reproducing scanning is performed on an optical disc rotated at a constant linear velocity. Detecting a wobbling signal corresponding to the wobble from the recording / reproducing signal obtained as described above, and extracting a first wobble signal corresponding to the first wobble from the wobbling signal and extracting the extracted first wobble signal. A wobbling signal extraction procedure for extracting a second wobble signal corresponding to the second wobble from the wobbling signal using a signal, and an address information reading procedure for reading the address information based on the second wobble signal. An optical disk recording / reproducing method comprising: rotating an optical disk based on the address information.

(6) As shown in FIG. 2, an optical disk master manufacturing apparatus for manufacturing an optical disk master according to any one of claims 1, 2 and 3, wherein
A first optical deflecting means for optically deflecting the exposure laser light with a synchronous wobble signal obtained by shaping a clock having a substantially constant frequency in accordance with the wobble, and the address corresponding to the second wobble. Second light deflecting means for deflecting the laser light for exposure with an address information wobble signal obtained by modulating information with the clock, and first and second light deflecting means respectively output from the first and second light deflecting means An optical disc master manufacturing apparatus, characterized in that wobbles corresponding to the first and second wobbles are formed on the master using light deflection exposure laser light.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk, an optical disk recording / reproducing apparatus, an optical disk recording / reproducing method, and an optical disk master manufacturing apparatus according to the present invention will be described below with reference to FIGS. FIG. 1 shows the configuration of the optical disk of the present invention.
As shown in FIG. 1A, a pre-groove 2 which is a track for recording data is previously formed on the optical disc 1 in a spiral manner from the inner circumference to the outer circumference. The direction of the spiral may be formed from the outer periphery toward the inner periphery, or may be concentric. Groove (guide groove) 2
Are constant, and the width of the land (between the guide grooves) 3 is also constant.

As a recording method used for an optical disk having such a configuration, it is possible to record data on both the groove G and the land L by using both a groove and a land as tracks on which data is to be recorded. Alternatively, data can be recorded using only the groove G as a recording track. As shown in FIG. 1B, the groove pitch (land pitch) is, for example, 1.
The groove G (land L) is wobbled by a small amount in the radial direction. The wobbling amplitude of the groove G (land L) is, for example, about 0.01 μm, and is preferably sufficiently smaller than the groove pitch (land pitch) so as not to affect the original tracking. The repetition frequency of such wobbling is set to be a constant frequency when the optical disc 1 is rotated at a constant angular velocity.

When rotating at a constant linear velocity, the repetition frequency of wobbling gradually decreases from the innermost circumference to the outermost circumference of the optical disk 1. This frequency is preferably set to a frequency sufficiently higher than the tracking servo band (generally several kHz) when actually rotating at the recording rotation speed so as not to affect the original tracking.

In FIG. 1, the phases of the adjacent groove wobbles and the land wobbles coincide, and the width of the land L is formed to be constant. FIG. 2 is a sectional perspective view of the optical disk.

As shown in FIG. 2, the left and right side walls (both ends) of the groove track are wobbled at the frequency of the synchronization signal (for example, a period of 75 μm), and one of the left and right side walls is from the inner circumference to the outer circumference. The meandering is formed continuously, and the other of the left and right side walls is formed by determining the presence or absence of the meandering according to the data bit of the address information. For example, as in the disk track shown in FIGS. 6A and 6B, a section where the data bit of the address information is "1" is formed such that one of the right and left side walls of the track does not meander for three periods of wobbling. The section where the data bit of the address information is “0” is formed in a meandering manner. That is, wobbling is formed with a change amount corresponding to the address information.

By forming the groove 2 as described above, wobbling can be detected stably even when scanning the land track and also on the land 3 in the same manner as when scanning the groove 2. Address information can be obtained stably as on the groove.

FIG. 3 shows a configuration example of an optical disk master manufacturing apparatus for manufacturing a master of the optical disk 1 having the pregroove 2. The master clock is frequency-divided by the frequency divider A1 to generate a continuous signal having a period of 3 μs, for example.
The synchronization signal wobbling signal (synchronous wobble signal) shaped into a sine wave by the LPF (Low Pass Filter) A2 drives the first optical deflector A4 via the optical deflector driving amplifier A3.

The modulation circuit A5 is supplied with a signal obtained by dividing the master clock and address information. The modulation circuit A5 modulates the modulation data bits (“1”, “1”) of the address information.
The presence / absence of a wobble is determined in accordance with the address data bit represented by "0", and an address wobbling signal (address information wobble signal) is output. The address wobbling signal is also shaped into a sine wave by the LPFA 6 and the amplifier A7.
The second optical deflector A8 is driven via. Laser light (laser light for master exposure) passing through the first and second optical deflectors A4 and A5 has a radius on the master AD via the objective lens A5 so as to form left and right side walls of the groove 2, respectively. It is arranged adjacent to the direction and exposed. Spindle motor A
Numeral 10 rotates the master disc AD at a predetermined speed. In the figure, AM1 and AM4 are half mirrors, A
M2 and AM3 are total reflection mirrors.

FIG. 4 shows the first and second optical deflectors A4 and A5.
1 shows an embodiment of the drive signal of FIG. A wobble A signal for a synchronous signal of a continuous sine wave having a constant period generated by dividing the master clock is supplied to the first optical deflector A via an amplifier A3.
4 is supplied. The presence / absence of the address wobble signal B is determined according to the bit data of the wobble address signal so that, for example, when the address bit data is “1”, the sine wave signal is not output for three cycles, the amplifier A
7, and is input to the second optical deflector A8.

The master disc AD is developed, a stamper is created from the master disc AD, and a number of replica optical discs 1 are formed from the stamper. As a result, the synchronization signal (wobble A signal) and the address signal (wobble B signal)
Thus, the optical disc 1 on which the pre-groove 2 is formed can be obtained. The left and right side walls of the pregroove 2 of the optical disk 1 are formed (wobbled) in accordance with the synchronization signal and the address signal.

FIG. 5 shows an example of the configuration of an optical disk recording / reproducing apparatus for recording / reproducing data on / from the optical disk 1 obtained as described above. The optical head B1 of the optical disk recording / reproducing apparatus B irradiates the optical disk 1 rotated at a constant linear velocity with laser light, records recording data on the optical disk 1, and reproduces reproduction data from the reflected light. I do. The recording / reproducing circuit B2 outputs the recording data to the optical head B1 by modulating the data by a predetermined method. The recording / reproducing circuit B2 appropriately demodulates reproduced data input from the optical head B1 and outputs the demodulated data to the outside.

The wobble detection circuit B3 detects a wobble signal from a signal reproduced and output by the optical head B1. The wobble signal is PLL (Phase Locked Loop) B
The signal is converted into a stable synchronization signal at 10 and AM (Amplitude)
Modulation) demodulation circuit B4 demodulates the wobble signal which is amplitude-modulated and reproduced, and outputs an address information reading circuit B5.
Reads address information from the synchronization signal and demodulated signal,
The read result is output to the feed control circuit B6. The wobble signal is reproduced in the land 3 and the groove 2 in the same manner, and a stable synchronization signal and address signal can always be obtained. The CLV reference signal generation circuit B7 calculates a radius value of the recording / reproducing position currently scanned by the optical head B1 based on address information, for example, track information, a sector address, etc., and is proportional to a predetermined linear velocity and inversely proportional to the radius value. A motor control reference signal is generated and sent to the motor control circuit B9 of the spindle motor B8, where the CLV (Constant Linear Veloci
(ty: constant linear velocity) Used for rotation control.

FIG. 6 shows an example of a track to be reproduced and a reproduced signal waveform. In the wobble detection signal (FIG. 8B), the amplitude of the wobble signal is reduced in a section where one of the right and left side walls of the track to be reproduced does not meander, as compared with a portion where both the left and right side walls meander. The section in which the wobble signal amplitude is reduced is a section in which the address data bit corresponds to "1". The synchronization signal may be generated by binarizing the wobble signal, or may be generated by a PLL. The address signal of the wobble signal is easily demodulated by a demodulation circuit using means (not shown) such as synchronous detection.

FIG. 7 shows an example of forming an address of the optical disc 1 of the present invention. As shown in the figure, track information R indicating the position of a specific track among a large number of tracks formed from the inner circumference to the outer circumference of the optical disc 1 and the track information R from the inner circumference to the outer circumference of the optical disc 1. Since addresses (address information) including angle information を indicating a specific radiation angle range among a large number of radiation angles formed at angular intervals are formed at equal angular interval periods, the total number of wobble cycles of one address is equal to the optical disk. 1 are the same on the inner and outer circumferences, but have different physical lengths. The angle reference mark is formed by a high-frequency wobble at the head of each address.

By using the track information R indicating the track number and the angle information θ, the CAV (Constant Angle Velocity: constant angular velocity) recording and reproduction of the optical disk 1 can be easily performed. That is, in the configuration of the optical disc recording / reproducing apparatus B shown in FIG.
The CLV reference signal generation circuit B7 is changed to a CAV reference signal generation circuit (not shown), and the connection between the CAV reference signal generation circuit and the address information reading circuit B5 is cut off. Thus, the read result including the track information R and the angle information θ read from the address information in the address information reading circuit B5 is output to the feed control circuit B6. The CAV reference signal generation circuit generates and outputs a motor control reference signal for rotating the spindle motor B8 at a constant angular velocity to the motor control circuit B9 regardless of the recording / reproducing position of the optical head B1. Thus, the rotation of the spindle motor B8 is controlled by CAV, so that the optical disc 1 can be rotated by CAV.

FIG. 8 shows another example of the formation of the address of the optical disk 1 of the present invention. As shown in the figure, since the sector address including the sector number information S constituting one sector is formed with a fixed number of wobble cycles, the physical length of the address area differs between the inner circumference and the outer circumference of the optical disc 1. However, since one sector address is formed at a constant physical length cycle, it is constant over the entire surface of the optical disk 1 irrespective of the inner circumference and the outer circumference of the optical disk 1. In a sector other than the sector address area, meandering is continuously formed.

As described above, the address area and the data area can be used in common, and the CLV (constant linear velocity) rotation control information and the address information can be stably obtained on both the land and the groove, so that high-density recording can be performed. .

[0033]

As described above, the optical disk of the present invention
Tracks are formed by wobbling in advance, and address information is recorded in the wobbles. When recording and reproducing data using this optical disk, the rotation control and track control of the optical disk are performed based on the read address information. Since the position can be accurately read, data can be recorded and reproduced at a high density. Further, not only the groove track but also the groove track and the land track are used in combination as the track. By using the address information, the rotation control of the optical disc and the track position can be accurately read. As in the case of recording / reproducing using only the groove track, data can be recorded / reproduced on both the groove track and the land track at high density. Further, when the address information includes track information (track number information) indicating the position of the track and angle information, CAV recording / reproduction can be easily performed. Further, if the radius value of the recording / reproducing position is calculated from the angle information and the track number information, CLV recording / reproducing can be easily performed. Further, when the address information includes a sector address (sector number information) indicating the position of the track on the optical disk, CLV recording can be easily performed. Further, according to the optical disk master manufacturing apparatus of the present invention, it is possible to create an optical disk master for duplicating an optical disk having the above-described effects.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a configuration of an optical disc of the present invention.

FIG. 2 is a diagram for explaining a cross section of the optical disc of the present invention.

FIG. 3 is a diagram for explaining an optical disk master manufacturing apparatus of the present invention.

FIG. 4 is a diagram for explaining operations of first and second optical deflection circuits.

FIG. 5 is a diagram for explaining an optical disk reproducing device of the present invention.

FIG. 6 is a diagram for explaining a relationship between a reproduction position of an optical disc and a reproduction waveform.

FIG. 7 is a diagram illustrating an example of forming an address of an optical disc.

FIG. 8 is a diagram showing an example of forming an address of an optical disc.

FIG. 9 is a diagram illustrating recording of an address by wobbling.

FIG. 10 is an enlarged view of a main part conceptually showing a conventional disk configuration.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 groove 3 land A optical disk master manufacturing apparatus A4 first optical deflector (first optical deflector) A8 second optical deflector (second optical deflector) B optical disk reproducing device B3 wobble detection circuit ( B4 AM demodulation circuit (Wobbling signal extraction means) B5 Address information reading circuit (Address information reading means) R Track information 角度 Angle information

Continuation of front page (72) Inventor Yasuhiro Ueki 3-12-12 Moriyacho, Kanagawa-ku, Yokohama-shi, Kanagawa Japan Victor Company of Japan, Ltd.

Claims (6)

[Claims] 1. An optical disk in which a track for recording data is formed by wobbling, wherein a groove width and an inter-groove width of the track are substantially constant, and the wobble rotates the optical disk at a constant angular velocity. Sometimes, the first wobble is formed at both ends of the track so as to obtain a substantially constant frequency, and the other wobble is continuously formed at one end of the track and the other wobble has a displacement amount corresponding to the address information. An optical disc comprising a second wobble formed in a portion. 2. The optical disc according to claim 1, wherein the address information of the second wobble includes at least track information indicating a position of the track on the optical disc and angle information. . 3. The optical disk according to claim 1, wherein the address information of the second wobble is at least a sector address indicating a position of the track on the optical disk, and a cycle of the sector address is a period of the optical disk. An optical disk characterized by being substantially constant in a radial direction. 4. An optical disk recording / reproducing apparatus for recording / reproducing data on / from an optical disk according to any one of claims 1, 2 and 3, wherein recording / reproducing scanning is performed on an optical disk rotated at a constant linear velocity. Detecting means for detecting a wobbling signal corresponding to the wobble from the recording / reproducing signal obtained as described above; and extracting a first wobble signal corresponding to the first wobble from the wobbling signal, and extracting the extracted first wobble signal. Wobbling signal extraction means for extracting a second wobble signal corresponding to the second wobble from the wobbling signal, and address information reading means for reading the address information based on the second wobble signal. An optical disk recording / reproducing apparatus, comprising: rotating an optical disk based on the address information. 5. An optical disk recording / reproducing method for recording / reproducing data on / from an optical disk according to claim 1, wherein the optical disk rotated at a constant linear velocity performs recording / reproducing scanning. A detection procedure for detecting a wobbling signal corresponding to the wobble from the recording / reproducing signal obtained as described above; and extracting a first wobble signal corresponding to the first wobble from the wobbling signal, and extracting the extracted first wobble signal. A wobbling signal extraction procedure for extracting a second wobble signal corresponding to the second wobble from the wobbling signal, and an address information reading procedure for reading the address information based on the second wobble signal. An optical disk recording / reproducing method comprising: rotating an optical disk based on the address information. 6. An optical disk master manufacturing apparatus for manufacturing an optical disk master according to claim 1, wherein the first wobble corresponds to a substantially constant frequency. A first optical deflecting unit for optically deflecting the exposure laser light with a synchronous wobble signal obtained by shaping a clock having an address; and an address information wobble signal obtained by modulating the address information with the clock corresponding to the second wobble. A second light deflecting means for deflecting the exposure laser light, and first and second light deflecting exposure laser lights output from the first and second light deflecting means, respectively. An optical disc master manufacturing apparatus, wherein wobbles corresponding to the first and second wobbles are formed on a master.