JPH11273090A - Optical disk, optical disk recording and reproducing device, method of recording and reproducing optical disk, and original disk for optical disk manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk capable of recording and reproducing a data in high density and with high accuracy. SOLUTION: The optical disk is constituted of grooves 2, lands 3 forming constant widths, and tracks wobbling in the radial direction at a constant frequency when it is rotated at a CAV(constant angular velocity). In this case, multiplexing marks M are superimposed on data bits of address information by making the marks corresponding to them on one of the right and left side walls of the tracks or on both sides, and each adjacent track (lands 3 and grooves 2) is formed so that the multiplexing marks M are in phase with each other.

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.
VFO (Variable Frequency Oscillate) is placed after the address pit area (at the beginning of data) so that L can be easily synchronized.
An area VFO for inserting r) is required, and the substantial recording capacity of the disc 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 a method for manufacturing an optical disk master having the following constitutions (1) to (5). Provide equipment.

(1) As shown in FIGS. 1, 2 and 8,
An optical disk in which a track for recording data is formed by wobbles, wherein a groove width and an inter-groove width of the track are substantially constant, and the wobble is substantially constant when the optical disk is rotated at a constant angular velocity. A multiplex mark formed at both ends of the track so as to obtain a frequency and having a cycle shorter than the wobbling cycle is provided at one end or both ends of the track according to the form of data bits of address information. An optical disc, wherein the multiplex marks are formed on adjacent tracks so that the phases of the multiplex marks coincide with each other.

(2) As shown in FIG. 7, the optical disc according to claim 1, wherein the address information includes at least track information indicating a position of the track on the optical disc and angle information. Optical disk.

(3) As shown in FIG. 5, an optical disk recording / reproducing apparatus for recording / reproducing data on / from the optical disk according to claim 1 or 2, which is obtained by performing recording / reproducing scanning on a rotating optical disk. Detecting means for detecting a wobbling signal corresponding to the wobble from a recording / reproducing signal;
Address information reading means for demodulating the multiplex mark from the wobbling signal and reading the address information, wherein the rotation of the optical disk is controlled at a constant linear velocity or a constant angular velocity based on the address information. Optical disk recording and reproducing apparatus.

(4) An optical disk recording / reproducing method for recording / reproducing data on / from an optical disk according to claim 1 or 2, wherein the wobble is converted from a recording / reproducing signal obtained by performing recording / reproducing scanning on a rotating optical disk. A detection procedure for detecting a corresponding wobbling signal, and an address information reading procedure for demodulating the multiplex mark from the wobbling signal and reading the address information, and controlling the rotation of the optical disc based on the address information, An optical disk recording / reproducing method, wherein the method is performed at a constant linear velocity or a constant angular velocity.

(5) As shown in FIG. 3, an optical disk master manufacturing apparatus for manufacturing an optical disk master according to claim 1 or 2, wherein a synchronous wobble in which a clock having a substantially constant frequency is waveform-shaped. First light deflection means for outputting a first light deflection exposure laser beam obtained by optically deflecting the exposure laser light by a signal, and the multiplex mark to a signal obtained by modulating the address information by the clock. A second light deflecting means for outputting a second light deflection exposure laser beam obtained by optically deflecting the first light deflection exposure laser beam with an overlapped address information wobble signal; An optical disc master manufacturing apparatus, wherein the wobble is formed on the master using the laser beam for light deflection exposure.

[0015]

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 shown in the enlarged view of the groove and the land in FIG. 2B, a multiplex mark M is formed in the groove 2 in advance corresponding to the address information.
The multiplex mark M corresponding to the data bit of the address information is formed by wobbling the groove 2 at a period shorter than the wobbling period corresponding to the synchronization signal (the synchronization signal wobble S shown in FIG. 2). The multiplexed mark M has a form that can be distinguished from a mark formed in the groove 2 in accordance with data recording. The address information is shared by the land and the groove. The multiplex mark M may be located on one of the side walls of the groove 2.

FIG. 8 is a diagram schematically showing an example of a track configuration and a reproduction waveform. The track G. wobbled by the low frequency synchronization signal wobble S. An optical disc 1 in which address information is formed by multiplexing a high-frequency multiplex mark M on L. In FIG. 8A, in-phase address information is formed by high-frequency wobble multiplex marks M on both side walls (upper and lower side walls, both end portions in FIG. 8) of the groove G.
Multiplexing marks M are arranged on both side walls of the land L (upper and lower side walls in the figure) so as to be always different only by one cycle and to be in phase with each other. That is, adjacent tracks (grooves G and L) are formed so that the phases of the multiplex marks M match.

FIG. 8B shows a reproduced signal reproduced at the track center position of each of the land L and the groove G. When reproducing the multiplex mark M, a large amplitude is always obtained on the groove G for all the waves. However, of the three address bits on both sides of the land L that are not aligned,
For one bit, the amplitude is about half.

Therefore, as shown in FIG. 8C, when the reproduced signal is converted into a binary ("0", "1") signal (result of an address code), an address bit having a small amplitude in the land L is obtained. May be determined as “0” or “1”. Note that, in the decoding method here, the data bits are composed of 3 bits, and those having a wave in the data bits are set to "1", and those having no wave are set to "0". At this time, a low frequency wobbling signal (synchronous signal wobble S) can be used as the timing signal. Address bits having a small amplitude in the land L
1 ", for example, track No. 1
Is detected as "010" in the land L of the track No. 2
The address of the groove G. If an address bit with a small amplitude in the land L is detected as "0", "000" is detected in the land L of the track No. 1 and becomes the same as the address of the groove G of the track No. 1. . At this time, whether the groove G or the land L can be easily determined based on the tracking polarity.

As described above, forming address data bits while symmetrically formed on both side walls of the groove G and switching at least one bit as the track scanning progresses is generally called a gray code. Here, a description has been given of the case where three address data bits are recorded / reproduced with the multiplex mark M. However, any address data bits of three bits or more may be used.
And the land L may be reversed. In other words, address information of the same phase is formed by the multiplex mark M of the high-frequency wobble on both side walls (upper and lower side walls in the figure) of the land L, and on both side walls of the groove G (upper and lower side walls in the figure) The multiplexing mark M may be arranged so that it is always different only by one cycle, and the others are in phase.

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 FIGS. 1B and 2, the groove pitch (land pitch) is, for example, about 1.2 μm, and the groove G (land L) wobbles by a small amount in the radial direction. The wobbling amplitude of the groove G (land L) is, for example, 0.01 μm.
Only to the extent that it does n’t affect your original tracking,
It is preferable to make it sufficiently smaller than the groove pitch (land pitch). 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. The amplitude of the address high frequency wobble (multiplex mark M) is also 0.0
The frequency is about 1 μm, and the frequency is a high frequency that does not adversely affect the data recording signal and is detectable.

When rotating at a constant linear velocity, the wobbling repetition frequency 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. 2, the grooves W and wobbles are formed so that the phases of adjacent wobbles coincide with each other so that the width of the land L is constant. As shown in FIG. 2, in the groove 2, the left and right side walls (both ends) of the groove track are wobbled at a synchronization signal frequency (for example, 100 kHz) (synchronization signal wobble S). A continuous wobbling is formed from the inner circumference to the outer circumference on both the left and right side walls of the track, and the multiplex mark M includes address information data in the synchronization signal wobble S on both or one of the left and right side walls of the track. In this configuration, high-frequency wobbles are superimposed and formed corresponding to bits.
For example, as in the disk track shown in FIG. 6A, a section where the data bit of the address information is "1" is formed by superimposing a multiplexing mark M for three periods of wobbling,
The multiplex mark M is not superimposed in a section where the data bit of the address information is “0”.

By forming the groove 2 as described above, the synchronizing signal wobble S and the multiplex mark M can be stabilized even when scanning the land track or on the land 3 in the same manner as when scanning the groove 2. And the address information shared with the groove can be obtained stably in the same manner as on the groove.

FIG. 3 shows an optical disk master manufacturing apparatus A for manufacturing a master of the optical disk 1 having the pregroove 2.
Is shown. Divide the master clock into frequency divider A1
To generate a continuous signal having a period of 3 μs, for example, and a wobbling signal for synchronization signal (synchronous signal) shaped into a sine wave by a low-frequency wobbling signal generation circuit A2 composed of an LPF (Low Pass Filter) or the like. Wobble signal)
A first optical deflector A4 via an optical deflector driving amplifier A3
Drive. The first optical deflector A4 outputs to the second optical deflector A8 a first optical deflection exposure laser beam obtained by optically deflecting the laser beam with a synchronous wobble signal.

The bi-phase modulation circuit A5 is supplied with a signal obtained by dividing the master clock by the frequency divider A6 and frequency division and address information. The bi-phase modulation circuit A5 expresses the high-frequency wobbles corresponding to the multiplex mark M according to the data bits (“1”, “0”) of the address information according to the NRZ address information shown in FIG. The presence or absence is determined, and an address wobbling signal (bi-phase modulated address information shown in FIG. 4C) is output.
The address wobbling signal is shaped into a sine wave by a multiplexed mark pulse generation circuit A7 composed of an LPF or the like, and a multiplexed mark superimposed address wobbling signal on which a multiplexed mark pulse signal is superimposed at high frequency (see FIG. 4A). The second optical deflector A9 is driven with the address information wobble signal shown) via the amplifier A8. Second deflector A9
Outputs the second laser beam for light deflection exposure obtained by deflecting the first laser beam for light deflection exposure supplied from the first deflector A4 with the address information wobble signal to the mirror AM side. The second laser beam for light deflection exposure (wobble signal shown in FIG. 4B) is irradiated and exposed on the master AD in the radial direction via the objective lens A9 so as to form the left and right side walls of the groove track. The spindle motor A11 is a master A
D is rotated at a predetermined speed.

As shown in FIGS. 4A and 4B, the address wobble signal is such that a sine wave signal is output for three periods when the address bit data is "1". The presence or absence of a signal is determined according to the bit data of the wobble address signal.

The master disc AD is developed, a stamper is created from the master disc AD, and a number of replica optical discs 1 (FIG. 1A) are formed from the stamper. As a result, the optical disc 1 having the pre-groove 2 in which the multiplex mark M is formed corresponding to the data bits of the address information described above is obtained. As shown in FIGS. 1B and 2, the left and right side walls of the pre-groove 2 of the optical disk 1 are wobbled in correspondence with the synchronization signal wobble S in which the multiplex mark M is multiplexed at high frequency. On the other hand, when the multiplex mark M is high-frequency multiplexed only on the wobble on one of the left and right side walls of the pre-groove 2 of the optical disk 1, only the synchronization signal wobble S is continuously formed on the other side wall. .

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 thus obtained. The optical head B1 of the optical disc recording / reproducing apparatus B irradiates the optical disc 1 with laser light to record recording data on the optical disc 1,
The reproduction data is reproduced from the reflected light. The recording / reproducing circuit B2 modulates data by a predetermined method,
The recording data is output to the optical head B1.
The reproduction data input from 1 is appropriately demodulated and output to an external device.

The wobble detection circuit B3 detects a wobble signal from a reproduction signal (RF signal) output from the optical head B1. The address demodulation circuit B4 demodulates the synchronization signal and the multiplex mark signal from the wobble signal. Then, address information is read from the demodulated synchronization signal and the multiplexed mark signal, and the read result is sent to the control circuit B.
5 is output. The feed control circuit B5 includes a feed motor B9.
, A feed signal in the radial direction of the optical head 1 corresponding to the address information is output. On the other hand, the feed control circuit B5 is supplied with scanning address information from the recording / reproducing circuit B2, which the optical head 1 is currently performing recording / reproducing scanning. Thus, the recording / reproducing circuit B detects and confirms the correct position of the sector where the optical head 1 is currently performing the recording / reproducing scan, and outputs the recording data to the optical head 1 and the demodulated reproduced data to the external device. Do. The wobble signal output from the wobble detection circuit B3 is reproduced in the same manner in the land 3 and the groove 2, and is always a stable synchronization signal (synchronization signal wobble S).
And the address information (multiplex mark M). The CLV reference signal generation circuit B6 is an address demodulation circuit B
5, for example, track information,
From the sector address or the like, the radius value of the recording / reproducing position where the optical head B1 is currently scanning is calculated, and the motor control circuit B7 generates a motor control reference signal proportional to a predetermined linear velocity and inversely proportional to the radius value. Output. Thus, the rotation of the spindle motor B8 is controlled by CLV (Constant Linear Velocity: constant linear velocity).

FIG. 6 shows an example of a track to be reproduced and a reproduction signal waveform. The wobble signal output from the wobble detection circuit B3 includes a low-frequency wobble detection signal ((B) in the figure) which is a synchronization signal and a high-frequency wobble detection signal ((C) in the figure) which is a multiplex mark signal. Three periods of the high-frequency wobble in the high-frequency wobble detection signal are sections in which the address data bits of the demodulated signal ((D) in the figure) as demodulated address information correspond to “1”.

FIG. 7 shows an example of forming an address of the optical disk 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 θ indicating a specific radiation angle range among a large number of radiation angles formed at angular intervals are formed at regular angular intervals, 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.

By using the track information R and the angle information θ indicating the track number and the multiplex mark M, the CAV of the optical disk 1 can of course be easily recorded with high precision. That is, in the configuration of the optical disc recording / reproducing apparatus B shown in FIG.
The reference signal generation circuit B6 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 B4 is cut off. Thus,
The multiplex mark M (the read result including the track information R and the angle information θ) read from the address information in the address information reading circuit B4 is sent to the control circuit B5. The CAV reference signal generation circuit controls the spindle motor B8 at a constant angular velocity regardless of the recording / reproducing position of the optical head B1.
The motor control circuit B outputs a motor control reference signal for rotating the motor.
7 and output. Thereby, the spindle motor B8
Is controlled by CAV, so that the optical disc 1 is
Can rotate.

As described above, in the optical disk 1 described above, the address area and the data area can be used in common, and CLV (constant linear velocity) rotation control information and address information can be stably obtained on both lands and grooves. It becomes possible to record with high accuracy.

[0035]

As described above, the optical disk of the present invention
Tracks are formed by wobbles, multiplex marks are superimposed on the wobbles in high frequency corresponding to data bits of address information, and adjacent tracks are respectively tuned so that the phases of such multiplex marks match. Since it is formed, one address information can be shared both when scanning a land track and when scanning a groove track. Therefore, when recording / reproducing data using this optical disc, the read multiplex mark is read. , The address information can always be satisfactorily obtained, and the rotation control of the optical disk and the track position currently being scanned can be accurately read, so that data can be recorded and reproduced with high density and high accuracy. Also, the address information is track information (track number information) indicating the position of the track.
If the information includes the angle information and the angle information, CAV recording and reproduction can be easily performed. Further, if the radius value of the recording / reproducing position is calculated from the track number information, CLV recording / reproducing 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 configuration of an 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 showing an example of forming a sector address of an optical disk.

FIG. 8 is a diagram showing an address configuration of an optical disc and a reproduction waveform.

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) M Multiplex mark R Track information Θ Angle information

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 19/247 G11B 19/247 R (72) Inventor Yasuhiro Ueki 3-12 Moriyacho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Victor Company of Japan, Ltd.

Claims (5)

[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. Occasionally, a multiplex mark formed at both ends of the track so as to obtain a substantially constant frequency and having a cycle shorter than the wobbling cycle is provided at one end of the track in accordance with the mode of the data bits of the address information. An optical disc characterized in that the multiplex marks are formed so as to be superposed on a portion or both ends, and adjacent tracks are formed so that the phases of the multiplex marks match. 2. The optical disk according to claim 1, wherein the address information includes at least track information indicating a position of the track on the optical disk and angle information. 3. An optical disk recording / reproducing apparatus for recording / reproducing data on / from an optical disk according to claim 1 or 2, wherein said wobble is obtained from a recording / reproducing signal obtained by performing recording / reproducing scanning on a rotating optical disk. Detecting means for detecting the obtained wobbling signal; and address information reading means for demodulating the multiplex mark from the wobbling signal to read the address information. An optical disk recording / reproducing apparatus characterized in that the recording is performed at a constant velocity or a constant angular velocity. 4. An optical disk recording / reproducing method for recording / reproducing data on / from an optical disk according to claim 1, wherein the wobble is recorded from a recording / reproducing signal obtained by recording / reproducing scanning on a rotating optical disk. A detection procedure for detecting the wobbling signal, and an address information reading procedure for demodulating the multiplexing mark from the wobbling signal and reading the address information. An optical disk recording / reproducing method, wherein the method is performed at a constant speed or a constant angular speed. 5. An optical disk master manufacturing apparatus for manufacturing an optical disk master according to claim 1, wherein the exposure laser beam is emitted by a synchronous wobble signal obtained by shaping a waveform of a clock having a substantially constant frequency. First light deflection means for outputting a first light deflection exposure laser beam obtained by deflection, and an address information wobble signal obtained by superimposing the multiplexing mark on a signal obtained by modulating the address information with the clock. A second light deflecting means for outputting a second light deflection exposure laser beam obtained by light deflection of the first light deflection exposure laser beam; An optical disc master manufacturing apparatus, wherein the wobble is formed on the master by using the wobble.