JPH08203208A - Recording device and reproducing device for disk-shaped recording medium - Google Patents

Abstract

(57) [Summary] [Structure] At the time of recording, together with the recording data, the 2T pattern for correcting the recording position deviation and the 8T pattern for setting the threshold value used in the ternary detection by the partial response are recorded on the disc-shaped recording medium. When recording and playing,
A recording device and a reproducing device for a disk-shaped recording medium that reproduces recorded data based on a reproduced 2T pattern and an 8T pattern, and a clock controller 5 at the time of recording.
Stops the clock supply to the data reproducing section 3 and stops it, and when the operation is not necessary, the 2T pattern generating section 6, 8T
The clock supply to the pattern generation unit 7 or the data pattern generation unit 8 is stopped and brought into a stopped state. During reproduction, the clock controller 5 causes the recording data forming unit 2 to
The clock supply to the 2T pattern processing unit 10 and the 8T pattern processing unit 11 or the data detection unit 12 is stopped and stopped. [Effect] Power consumption can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is suitable for use in a recording device, a reproducing device, or a recording / reproducing device of a disk-shaped recording medium such as a magnetic disk, a magneto-optical disk, a compact disk, and a write-once which employs a so-called sample servo system. Disk-shaped recording medium recording / reproducing apparatus, in which the power consumption is reduced by controlling to a stopped state except where the necessary operation is performed. Regarding the device.

[0002]

2. Description of the Related Art Today, so-called sample servo type optical disks are known. In this sample servo type optical disc, a predetermined servo pattern is provided on a recording track at predetermined intervals, and while performing servo control based on a reproduction signal of this servo pattern, a servo pattern is provided between the servo patterns. It is designed to record and reproduce recorded data.

[0003] Here, with the progress of multimedia oriented to the advanced information society, it is required to reduce the size and cost of optical discs as well as further improve the performance and the capacity. In order to increase the capacity, the recordable area of the disc is limited, so it is necessary to improve the linear density and the track density. Because of interference,
The aperture ratio of the reproduction eye pattern decreases, and the probability of misreading the data increases.

For this reason, signal processing technology using partial response and Viterbi decoding, which makes it possible to improve recording density by positively utilizing inter-code interference and to enable accurate data reproduction, is used.

Further, when data is recorded, the recording position may be displaced due to variations in the sensitivity of the medium and variations in laser power due to temperature characteristics and the like. Therefore, a signal processing technique or the like is used in which the reference data is recorded together with the data, and at the time of reproduction, the phase of the reproduction clock is compensated based on the reference data to reproduce the data.

[0006]

As described above, as the recording density is improved, the signal processing becomes complicated, so that the circuit scale is inevitably increased and the power consumption is increased. In recent years, the demand for low power consumption of disk drives has become a strong and important issue.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a recording device and a reproducing device for a disk-shaped recording medium that can reduce the power consumption of a disk drive. .

[0008]

DISCLOSURE OF THE INVENTION A disk-shaped recording medium recording apparatus according to the present invention has a plurality of servo areas in which predetermined servo patterns are arranged at predetermined intervals, and uses a space between the servo areas as a data area. A recording device for a disk-shaped recording medium, in which desired recording data is recorded on a recording medium by recording means. A reference pattern forming means for forming a reference pattern to be recorded for each predetermined recording unit and supplying it to the recording means; and a data pattern forming means for forming a data pattern of recording data and supplying it to the recording means, When the reference pattern is formed by the reference pattern forming means, the data pattern forming means is stopped, and when the data pattern of the recording data is formed by the data pattern forming means, the reference pattern forming means is And a control means for bringing it to a stopped state.

In the disk-shaped recording medium recording apparatus according to the present invention, the reference pattern forming means includes a first reference pattern forming means for forming a predetermined first reference pattern and a predetermined second reference pattern forming means. It is composed of a second reference pattern forming means for forming a reference pattern. In this case, when the data pattern forming unit forms the data pattern of the recording data, the control unit forms the second reference pattern when the first reference pattern forming unit forms the first reference pattern. The reference pattern forming means is stopped, and when the second reference pattern forming means forms the second reference pattern, the first reference pattern forming means is stopped.

Further, the recording device for a disc-shaped recording medium according to the present invention is provided on the disc-shaped recording medium at predetermined intervals, and position information for detecting a position information recording area in which position information is previously recorded is detected. It has a recording area detecting means. In this case, the control means brings the recording means into a stopped state for each of the position information recording areas based on the detection output from the position information recording area detecting means.

Further, the recording apparatus for the disk-shaped recording medium according to the present invention has a system clock output means for outputting the system clock required for recording. In this case, the control means puts the system clock output means in a stopped state when recording is not actually performed.

Next, in the disk-shaped recording medium reproducing apparatus according to the present invention, a plurality of servo areas in which predetermined servo patterns are arranged at predetermined intervals and a predetermined reference pattern are recorded for each predetermined recording unit. A reproducing device for a disc-shaped recording medium that reproduces reproduction data recorded in a data area between the servo areas from a disc-shaped recording medium having a reference area. And a reference pattern detecting means for detecting the reference pattern reproduced from the reference area, a data detecting means for reproducing the reproduced data based on the reference pattern detected by the reference pattern detecting means, and the reference pattern detecting means. And a control means for bringing the data detecting means into a stopped state when the reference pattern is being detected, and holding the reference pattern detecting means when the reproduced data is being detected with the data detecting means. .

In the disk-shaped recording medium reproducing apparatus according to the present invention, different predetermined first and second reference patterns are recorded as the reference patterns on the disk-shaped recording medium. The reference pattern detecting means is composed of a first reference pattern detecting means for detecting the first reference pattern and a second reference pattern detecting means for detecting the second reference pattern. In this case, the control means sets the second reference pattern detection means together with the data detection means to a stopped state when the first reference pattern detection means is detecting the first reference pattern, and the first reference pattern detection means stops the second reference pattern detection means. Two
When the second reference pattern is being detected by the reference pattern detecting means, the first reference pattern detecting means is stopped together with the data detecting means.

Further, the disk-shaped recording medium reproducing apparatus according to the present invention has a system clock output means for outputting a system clock necessary for reproduction. In this case, the control means brings the system clock output means into a stopped state when the reproduction is not actually performed.

[0015]

A disk-shaped recording medium recording apparatus according to the present invention is a so-called sample servo type disk-shaped recording medium recording apparatus, and the reference pattern forming means forms a reference pattern to be recorded in each predetermined recording unit. To do.
Further, the data pattern forming means forms a data pattern of the recording data. Then, the recording means records the reference pattern and the data pattern on the disk-shaped recording medium.

At this time, the control means stops the data pattern forming means when the reference pattern is being formed by the reference pattern forming means, and the data pattern of the recording data is formed by the data pattern forming means. When it is, the reference pattern forming means is stopped.

Specifically, the reference pattern forming means is a first reference pattern forming means for forming a predetermined first reference pattern, and a second reference pattern for forming a predetermined second reference pattern. It is composed of forming means. Therefore, the control means is configured to form the second pattern when the data pattern forming means forms the data pattern of the recording data and the first reference pattern forming means forms the first reference pattern. The reference pattern forming means is stopped, and when the second reference pattern forming means forms the second reference pattern, the first reference pattern forming means is stopped.

Further, the disc-shaped recording medium is provided with position information recording areas in which position information is recorded in advance at predetermined intervals. No recording data is recorded in this position information recording area. Therefore, the control means brings the recording means into a stopped state for each position information recording area detected by the position information recording area detection means.

Further, the recording device for the disk-shaped recording medium is provided with a system clock output means for outputting a system clock required for recording. The system clock output means does not need to output the system clock when recording is not actually performed. Therefore, the control means brings the system clock output means into a stopped state during non-recording.

Next, the reproducing apparatus for the disk-shaped recording medium according to the present invention corresponds to the so-called sample servo system,
The reference pattern detecting means detects the reproduced reference pattern and supplies it to the data detecting means. The data detecting means reproduces the reproduction data based on the reference pattern.

Since the data detecting means reproduces the reproduced data based on the reference pattern, the data cannot be reproduced until the reference pattern is detected by the reference pattern detecting means. Therefore, the control means brings the data detection means into a stopped state when the reference pattern detection means is detecting the reference pattern. In addition, since the reference pattern is recorded on the disk-shaped recording medium for each predetermined recording unit, once it is detected, it is not necessary until the next reference pattern is detected. Therefore, the control means brings the reference pattern detection means into the stopped state when the reproduction data is being reproduced by the data detection means.

Specifically, different predetermined first and second reference patterns are recorded as the reference patterns on the disc-shaped recording medium,
Further, the reference pattern detecting means is the first
The first reference pattern detecting means for detecting the reference pattern and the second reference pattern detecting means for detecting the second reference pattern. For this reason, the control means sets the second reference pattern detection means together with the data detection means to a stopped state when the first reference pattern detection means is detecting the first reference pattern, and the first reference pattern detection means stops the second reference pattern detection means. When the second reference pattern detecting means is detecting the second reference pattern, the first reference pattern detecting means is stopped together with the data detecting means. Further, the reproducing apparatus for the disc-shaped recording medium is provided with a system clock output means for outputting a system clock required for reproduction. The system clock output means does not need to output the system clock when the reproduction is not actually performed. Therefore, the control means brings the system clock output means into a stopped state during non-reproduction.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a recording device and a reproducing device for a disc-shaped recording medium according to the present invention will be described in detail below with reference to the drawings.

The recording device and the reproducing device for the disk-shaped recording medium according to the present invention operate in accordance with the so-called sample servo system, and as shown in FIG. 1, a recording designation command and a reproduction for designating recording. Command receiving unit 1 for receiving a reproduction designation command for designating a disc, a recording data forming unit 2 for forming recording data for recording on a disc-shaped recording medium, and data for reproducing the reproduction data from the disc-shaped recording medium. A reproducing unit 3, a timing generator (TG) 4 for forming and outputting a necessary clock, and stopping the clocks supplied to the recording data forming unit 2, the data reproducing unit 3 and the timing generator 4 as necessary. And a clock controller 5 for controlling the stop state.

The recording data forming unit 2 has a 2T pattern generating unit 6 for generating a 2T pattern which is a reference pattern for phase compensation of a DC recording position deviation due to a change in recording laser power at the time of reproduction, and a partial response. An 8T pattern generation unit 7 that generates an 8T pattern for setting a threshold value used in three-value detection by
The data pattern generation unit 8 generates a data pattern of print data.

The data reproducing unit 3 also includes a 2T pattern processing unit 10 for detecting the 2T pattern obtained during reproduction, an 8T pattern processing unit 11 for detecting the 8T pattern obtained during reproduction, and the 2T pattern processing unit 11. Pattern processing unit 1
The data detection section 12 reproduces the reproduction data based on the 2T pattern and the 8T pattern detected by the 0 and 8T pattern processing sections 11.

The recording apparatus and reproducing apparatus for the disk-shaped recording medium according to the present embodiment having such a configuration are magneto-optical for recording / reproducing recorded data on / from the magneto-optical disk 25 according to the sample servo system as shown in FIG. It can be applied to a disc recording / reproducing apparatus.

The magneto-optical disk recording / reproducing apparatus is composed of a disk drive 21 and a control block 22. Then, commands and data are transmitted / received to / from the host computer 23 connected via the SCSI bus 24.

The disk drive 21 includes a spindle motor 26 for rotating the magneto-optical disk 25 at a constant speed, a spindle driver 27 for rotating the spindle motor 26, and the magneto-optical disk 25.
A loading mechanism 28 for mounting the same in the disc drive 21, a pickup 29 for irradiating the magneto-optical disc 25 with a laser beam, and the magneto-optical disc 25.
A laser diode 30 that emits a laser beam for irradiating a laser beam, a laser beam having a constant recording level when recording data, and a laser beam having a constant reproducing level when reproducing data. Thus, it has a laser driver 31 for driving the laser diode 30 to emit light.

The disk drive 21 receives the reflected light generated by irradiating the magneto-optical disk 25 with a laser beam and forms a RF signal, a tracking error signal, a focus error signal, etc., and a photodetector 32. A current-voltage conversion block (IV conversion block) 33 which converts the RF signal and the like supplied in the form of current from the photodetector 32 into a form of voltage, and amplifies and outputs these with a predetermined gain.
And a magnetic head 34 for applying a modulation magnetic field according to the data to the magneto-optical disk 25 at the time of data recording, and a magnetic head driver 35 for driving the magnetic head 34 according to the data to be recorded.

Next, the control block 22 controls the data processing block 45 and the servo control block 46 via the digital signal processor bus (DSP bus) 42 and the central processing circuit bus (CPU bus) 54. It is configured by connecting to 41.
The host computer 23 is connected to the controller 41 via the SCSI bus 24.

The data processing block 45 makes the laser level of the laser beam applied to the magneto-optical disk 25 constant according to the laser level detected in the forward path of the laser beam applied to the magneto-optical disk 25. Control (front auto power control: FA
Input / output block (I / O block) 43 to which FAPC data for PC is supplied, and D which converts the FAPC data to analog and supplies it to the laser driver 31.
And / A converter 44.

Further, the data processing block 45 controls the servo from a servo system timing generator (STG) 52 which will be described later on the magneto-optical signal (MO signal) and RF signal from the IV conversion block 33 of the disk drive 21. A selector & clamp circuit 47 that performs selection and clamp processing based on a timing clock for a control system, a servo clock generation circuit (SPLL) 49 having a phase locked loop configuration that generates a servo clock, and a phase clock that generates a data clock. And a data clock generation circuit (DPLL) 50 having a locked loop configuration.

Further, the data processing block 45 has a clock selector 51 for selecting the servo clock or the data clock based on the timing clock from the STG 52, and the selector & clamp circuit 47.
A / signal for digitizing the RF signal or MO signal from the A / D with the clock selected by the clock selector 51.
And a D converter 48.

The data processing block 45 also includes a data system timing generator (DTG) 55 that forms a timing clock for data processing based on the data clock from the DPLL 50, and the DPLL 50.
The data to be recorded is supplied to the magnetic head driver 35 based on the data clock from the DTG 55 or the timing clock for data processing from the DTG 55, and the reproduced data is supplied to the host computer 23 via the controller 41. Circuit 56.

Next, the servo control block 46 selects and outputs the focus error signal, the FAPC signal and the tracking error signal from the I / V conversion block 33 of the disk drive 21.
And each signal from the multiplexer 61 to the SPL
A / D converter 62 for digitizing based on the servo clock from L49, I / O block 63 to which each A / D converted data is supplied, and digital signal processing of the magneto-optical disk recording / reproducing apparatus. And a digital signal processor (DSP) 67 for performing.

The servo control block 46 controls focusing / tracking of the pickup 29 and an I / O block 66 to / from which control data for controlling the rotation of the spindle motor 26 of the disk drive 21 is input / output. Pickup driver 64 that
It has a pulse width modulation circuit (PWM circuit) 65 for pulse width modulation driving the pickup driver 64.

The magneto-optical disc recording / reproducing apparatus has the disc-shaped recording medium recording / reproducing apparatus according to the present embodiment shown in FIG.

Next, the magneto-optical disk 25 used in the magneto-optical disk recording / reproducing apparatus is divided into segments of 1400 per track as shown in FIG. 3, for example, and the segments are address segments ASEG.
And the data segment DSEG.

In the address segment ASEG, position information in the radial direction of the disc and position information in the tangential direction are recorded as prepits. Further, 100 address segments ASEG are provided every 14 tracks in one track, and one frame extends from the address segment ASEG to the next address segment ASEG. Further, the address segment ASEG exists for 100 frames per track,
13 segments between the address segments ASEG are data segments DSEG.

The above data segment DSEG is 1 per revolution.
It is provided so that there are 300 segments. Further, this one segment is composed of 216 servo locks, and servo areas ARs and 19 for 24 servo clocks are provided.
It is formed of a data area ARd for two servo clocks.

In the case of the address segment ASEG, the data area ARd is the address area ARd.
a and the laser control area ARdwapc.

Next, in the servo area ARs, for example, as shown in FIG. 4, three pits P _A , P _B and P _C each having a length of 2 servo clocks are separated by 5 servo clocks or more. In addition to being recorded in advance, a focus sample area ARfs for 6 clocks is provided. Thus, the pits P _A , P of the servo area ARs
_{By making B} and P _C each two servo clocks long, the number of mirrors is reduced, making it difficult to generate ghost pits and the like that occur on the disk due to molding conditions, and to reduce the difficulty of pit generation. Therefore, it is possible to stably generate the servo signal. Further, by providing the pits P _A , P _B , and P _C at intervals of 5 servo clocks or more, the interference between the pits can be made extremely small.

The second pit P _B located in the 11 to 12 clock period and the third pit P _C located in the 16 to 17 clock period of the servo area ARs respectively are ± 1/4 track with respect to the center of the track. It is a wobbled pit that is offset only.

[0045] The magneto-optical disc recording and reproducing apparatus, each of the pits P _B, and detects a tracking error based on the difference between the amplitude value of the reproduction output of the P _C, also respective pits P _B, the P _C reproduction output The clock phase is controlled based on the difference between the amplitude values of the two edge portions. Further, by adding this phase information and performing clock phase control, accurate clock phase control that is not affected by the tracking state is performed.

The first area at the beginning of the servo area ARs
The pit P _A indicates whether the segment is the address segment ASEG or the data segment DSEG, or the segment is the head of the sector or the next segment is the head of the sector. It is supposed to indicate.

Specifically, the first pit P _A is 9 to
If it is recorded to be located in the 10-clock period, it indicates that the segment is the data segment DSEG, and if it is recorded to be in the 2-3-clock period, the segment is the address segment ASEG. To indicate that. When the first pit P _A is recorded so as to be located in the 3-4 clock period, it indicates that the segment is the data segment DSEG which is the head of the sector, and in the 4-5 clock period. When it is recorded so as to be located, it indicates that the next segment is the data segment DSEG which is the head of the sector, and that it is the address segment ASEG.

The information indicated by the first pit P _A is the maximum difference value detection, as shown in FIG. 5, for example.
It can be identified by examining the position taking the maximum amplitude value by the so-called differential detection method.

As described above, the magneto-optical disk 25 has
Since the first pit P _A is recorded at the beginning of the servo area ARs, it can be determined whether the segment is the address segment ASEG or the data segment DSEG, or it is at the beginning of the sector. It is possible to determine whether or not the next segment is the head of the sector, and it is possible to omit recording the sector number and track address in sector units. Therefore, in this magneto-optical disk 25, the redundancy of the data area is reduced as a whole.

Next, in the address segment ASEG, as shown in FIG. 6, a track address [AM] of 16 bits is stored as information on the radial position of the disk.
An access code including [A2], [A3], [AL] and its parity [P], and a frame code indicating frame addresses [FM] and [FL] as tangential direction information are gray-coded, respectively. It is recorded as a pre-pit.

In the access code, a 16-bit track address is divided into 4 bits, and the access code of an adjacent track is recorded so that only one pattern changes.

Specifically, when the least significant bit of the above-mentioned 4 bits is "1", the following 4 bits are AM-compared to the value obtained by taking the complement of 1 by using the Gray code table shown in FIG. = 15 to 12 bits (MSN) to A2 = 11
~ 8 bits (2SN), A3 = 7 to 4 bits (3S
N) and the table conversion is performed in the order of AL = 3 to 0 bits (LSN), so that the access code of the adjacent track changes only by one pattern. Note that FIG.
Shows an example of the above access code.

As the parity code, each bit [15, 11, 7, 3], [14, 1 of the access code is used.
0, 6, 2], [13, 9, 5, 1], [12, 8,
The result of taking the parity which becomes 1 when the number of "1" for each 4,0] is an even number is recorded.

In the frame code, an 8-bit frame address representing the tangential direction number of the address segment ASEG is divided into 4 bits, and the upper 4 bits FM = 7 to 4 bits (MSN) and the lower 4 bits. Bits LM = 3 to 0 bits (MSN) are gray-coded and recorded in the same manner as the above access code. This frame code can record information of 8 bits, but in the case of the present embodiment, since the number of the address segment ASEG is 100, it exists only from 0 to 99.

The focus sample area ARfs of the servo area ARs serves as a mirror portion so as not to receive pit modulation, and is used when performing focus, read power APC, clamping of RF signal, and the like. It is difficult to specify the positions of various sample pulses for these processes, and fluctuations of ± 0.5 clocks or less are expected. Therefore, even if these fluctuations are added, they are affected by pit modulation. The space is 6 clocks so that sampling can be performed without fail.

Next, as shown in FIG. 8, the data area ARd of the data segment DSEG includes a data area ARda for 176 to 376 data clocks for recording normal data and a prewrite area ARpr for 12 data clocks. It is composed of a post-write area ARps for 4 data clocks.

The pre-write area ARpr is provided to be used as a clamp area for securing a distance required for preheating from laser irradiation to a stable temperature of the disk and for suppressing DC fluctuation due to birefringence of MO signal. Has been.

The post-write area ARps is provided in order to eliminate the unerased portion by overwriting and to secure a distance to avoid interference from the groove edge.

This magneto-optical disk 25 can be used without requiring a formatting operation by bulk erasing in one direction at the time of shipping. And
The pre-write area ARpr and the post-write area ARps record data having the same polarity as the bulk erase direction, so that a stable signal can be obtained even if the pre-write area ARpr and the post-write area ARps are not normally recorded due to insufficient residual heat of the medium. .

The magneto-optical disk 25 has a groove Gr formed in the data area ARd. Since the groove Gr is not for tracking, accuracy such as depth thereof is not required.
By providing the groove Gr, it is possible to reduce a necessary mirror portion and reduce an adverse effect on the servo pit in forming the disk.

Incidentally, this is the case of the magneto-optical disk 25 for recording / reproduction, but in the case of a read-only ROM disk, as shown in FIG. 9, an anchor for 3 clocks is added to the head portion of the data area ARd. By providing the pit Pan, the mirror portion is reduced, and the adverse effect on the servo pit in forming the disk is reduced.

Next, one data sector has a reference area of 66 bytes and user data of 2048 bytes (D0 to D0).
D2047), ECC 256 bytes (E1,1 to E1
6, 16), CRC8 bytes (CRC1 to CRC8),
It is composed of a total of 2418 bytes including a vendor unique 8 bytes (VU) and a user defined 32 bytes (UD).

In the reference area, as shown in FIG. 10, an 8T pattern for 4 bytes and 2 for 12 bytes are provided.
The T pattern is defined as one block, and a fixed pattern of this one block is recorded for four blocks, and a specific pattern for 66 bytes is formed by a 2-byte all-0 pattern as a margin for setting the detected information. Is recorded.

The 8T pattern is used for setting three-valued levels (high H, medium M, low L) in data detection.
The T pattern is used to correct a DC pit position shift due to recording power fluctuation or the like during reproduction.

The reference area 66 is included in the data area ARd of the data segment DSEG.
Data other than bytes is scrambled, and NRZI data is recorded for each segment.

The magneto-optical disk 25 is a so-called zone CAV disk, and as shown in FIGS. 11 and 12, a GCP band of 736 tracks from the outer peripheral side, a buffer track of 2 tracks, a track of 5 tracks. Control track, 2 track buffer track, 5 track test track, 848 track user zone 0, 864 track user zone 1, 880 track user zone 2, 912 track user zone 3, 944 User zones for tracks 4, 976 user zones for tracks 5, 1024 user zones for tracks 6, 1056 user zones for 7 tracks, 1120 user zones for 8 tracks, 1
User zone 9 for 184 tracks, user zone 10 for 1216 tracks, user zone 11 for 1296 tracks, user zone 12, 1392 tracks
User zone 13 for 488 tracks, user zone 14 for 1696 tracks, user zone 15 for 770 tracks, test track for 5 tracks, buffer track for 2 tracks, control track for 5 tracks, buffer for 2 tracks It consists of tracks and 820 tracks of GCP bands.

Here, the number of tracks in the zone is TRAC.
zone, and the number of data segments required for one sector in a certain zone is DSEGsec-zone,
The number of data segments per track is DSEGtr
As the ack, when the sectors are completed for each zone and the number of sectors is fixed, the number of sectors in the zone SCT
zone is SCTzone = TRACzone / DSEGtrac
k / DSEGsect-zone, and the number of tracks may be determined so that TRACzone = K · DSEGsect-zone. And K
The number of sectors SCTzone, which is determined by using a value close to the capacity per zone divided by the zone with respect to the total capacity, is allocated from the outer circumference, and the recording density of the innermost circumference part of the zone All parameters can be obtained by determining the clock (M) so that the density does not drop below the density.

In this case, as shown in FIG. 13, when a sector starts from a certain segment, the number of segments forming one sector and the sector is ended, and even if there are extra bytes in the last segment, the next sector is It is supposed to start from the next segment. As a result, at the beginning of the zone, it is possible to continuously configure sectors starting from the sector of 0 frame code.

In the innermost zone, the number of sectors may not be the same as that of the other zones due to the relationship with the recording area, but a fractional number may occur, but the innermost zone extends to the track where the sector ends at segment 0. By setting the zone, the capacity of the parity sector can be easily calculated.

In this magneto-optical disk 25, the user zone is divided into 16 zones as described above, and the number of data bytes (segment data) included in one segment by the data clock DCLK multiplied by M / N of the servo clock SCLK ( byte / seg) and the number of segments per sector (seg / sector) are determined. That is, assuming that the number of servo clocks in the servo area ARs is N and the data clock is M / N of the servo clocks, the number of servo clocks in one segment SCLKseg
And the number of data clocks DCLKseg is SCLKseg = 9N DCLKseg = SCLKsegM / N. Note that N and M are integers.

Further, as described above, one track has 1400
It is divided into segments, and 1300 of these are data segments DSEG, but since no data is recorded in the GCP band, 100 segments of 1300 data segments DSEG contain GCP information such as media information. Keep GCP segment GCPs
As shown in FIG. 14, the GCP segment GCPseg, which is used as an egg, is assigned to the data segment at the intermediate position of each address segment ASEG.

Then, the GCP segment GCPseg
Shows the servo areas ARs and GCP as shown in FIG.
The GCP area ARgcp is composed of an area ARgcp and a blank ARblk. In the GCP area ARgcp, seven 4-bit data gray-coded by the same method as the access code, that is, [GCPH], [GCP2], [GCP3], [G
GCP code consisting of CPL] and its parity [P],
Further, the page numbers [PNH] and [PNL] are gray-coded and recorded in pits.

An error can be detected in the GCP code by adding a parity [P]. Also, by adding page numbers [PNH] and [PNL], a plurality of media information and the like can be given as GCP information. Page number [P
NH] and [PNL] are up to 16 pages,
By recording the same information in [PNH] and [PNL], it is possible to make it robust against errors.

In the GCP area ARgcp,
GCP segment G of the last 1 digit of the address (frame number) recorded in the address segment ASEG
Set each GCP to match the page number of CPseg.
By arranging the segment GCPseg, misreading of the frame number of the address segment ASEG and the page number of the GCP segment GCPseg can be eliminated. Furthermore, 10 pages, that is, 10 types of G
By repeatedly recording the CP information 10 times, it is possible to reduce misreading of each of the 10 types of GCP information.

Next, the operation of the magneto-optical disk recording / reproducing apparatus according to this embodiment will be described.

As described above, this magneto-optical disk recording / reproducing apparatus is adapted to transmit / receive commands and data to / from the host computer 23 connected via the SCSI bus 24.

The process for transmitting and receiving the above command and data is performed by the controller 41 of the control circuit block 22. This controller 41 is
At the time of recording, CRC or an error correction code is added to the data from the host computer 23 and supplied to the disc drive 21, and at the time of reproduction, the data from the disc drive 21 is error-corrected and only the user data portion is recorded. Transfer to the host computer 23. Further, commands to the servo system and each block of the disk drive 21 are performed by the DSP 67 which performs necessary processing for commands from the controller 41.

Specifically, when the magneto-optical disk 25 is mounted on the turntable by the loading mechanism 28, the DSP 67 responds to the request from the host computer 23 or to the set automatic spin-up mode. Then, the spindle driver 27 is instructed to rotate the spindle motor 26 via the I / O block 66. The spindle driver 27 outputs a lock signal when the spindle motor 26 reaches a predetermined rotation speed,
Notify the DSP 67 that the rotation is stable. Further, during this period, the DSP 67 performs pulse width modulation (PWM).
The pickup 29 is moved to the outer or inner side by the pickup driver 64 via the circuit 65 so that the beam spot is located outside the user area. If a disc with high sensitivity is loaded when focus is pulled in the user area, the data recorded there may be accidentally erased. For example, the GCP zone outside the user area may be erased. Such erroneous erasure can be prevented by pulling in the focus by, for example.

When the spindle motor 26 rotates at a constant speed and the pickup 29 moves to the outer peripheral side, for example, the DSP 67 causes the I / O block 43 to move to the D / A converter 4.
Pickup 2 for laser driver 31 via 4
The bias current LDbias of the laser diode 30 provided in FIG. 9 is set, and a command is issued to the STG 52 that controls ON / OFF of the laser diode 30 to emit laser light.

As a result, a laser beam is emitted from the laser diode 30 and applied to the magneto-optical disk 25. Then, the reflected light of the laser beam is generated, and the reflected light is received by the photodetector 32 provided in the pickup 29.

The photodetector 32 forms an MO signal and an RF signal on the basis of the received light level of the reflected light, and at the same time, outputs a tracking error signal, a focus error signal and a FAPC signal for controlling the laser level of the laser beam. It is formed and these are supplied to the I / V conversion block 33.

The I / V conversion block 33 converts each of the signals supplied in the form of current into the form of voltage,
Selector & clamp circuit 4 for the above MO signal and RF signal
7 and the tracking error signal,
The focus error signal and the FAPC signal are supplied to the multiplexer 61. The multiplexer 61 time-divisionally selects the tracking error signal, the focus error signal, and the FAPC signal and supplies them to the A / D converter 62.

The A / D converter 62 outputs the tracking error signal, the focus error signal and the FAPC signal, which are supplied in a time division manner, to the SPLL circuit 4 described later.
Each of them is digitized based on the servo clock from 9 and these are converted to the DS through the I / O block 63.
Supply to P67.

The DSP 67 detects the laser level based on the FAPC data, and outputs the light amount control data calculated by the digital filter via the I / O block 43 and the D / A converter 44 to the laser driver 31.
The laser power of the laser diode 30 is controlled to be constant by feeding back to the laser diode.

Next, the DSP 67 includes a PWM circuit 65.
By passing a current through the focus driver of the pickup driver 64, the focus actuator of the pickup 29 is driven up and down to be in a focus search state described later. At this time, the magneto-optical disk 25
The reflected light from is detected by the photo detector 32,
The detection output of the photodetector 32 is converted into a voltage by the I / V conversion block 33, and the multiplexer 61 outputs it as a focus error signal via the matrix amplifier.
Is supplied to.

This focus error signal is the FAP
Similar to the C signal, it is digitized by the A / D converter 62 and supplied to the DSP 67 via the I / O block 43 as a signal selected by the multiplexer 41 in a time division manner.

The DSP 67 returns the focus control data obtained by digitally filtering the digitized focus error signal from the PWM circuit 65 to the focus driver of the pickup driver 64, thereby performing focus servo control. Form a servo loop for.

When the focus servo becomes stable, the amplitude of the RF signal obtained by the I / V conversion block 33 from the detection output of the photodetector 32 becomes constant to some extent, and after being clamped to an appropriate potential by the selector & clamp circuit 47. A / D by A / D converter 48
D converted.

The sampling clock at this time is SP
This is the frequency of the free running state of LL49. Further, the clamping timing pulse has a frequency obtained by dividing the frequency in the free-run state by the STG 52.

The SPLL 49 checks the pit pattern by looking at the amplitude difference of the RF signal digitized by the A / D converter 48, and searches for the same pattern as the pit row in the servo area. Then, when a pattern is found, the clock selector 51 is controlled so as to open a window at the position where the next pattern should appear, and it is confirmed again whether the patterns match. If this operation is continuously confirmed a certain number of times, it is considered that the SPLL 49 has locked the disk. The phase information is obtained by taking the amplitude difference between both shoulders of the wobble pit in the servo area.
Further, by adding the phase information obtained from both of the two wobble pits, the gain fluctuation caused by the amplitude change due to the tracking position is absorbed.

When the SPLL 49 is locked, the position of each segment becomes clear, the position of the segment mark pit can be recognized, and the window is opened at the four positions A, B, C and D shown in FIG. The clock selector 51 is controlled to search for a position having the maximum amplitude among the RF signals sampled at these four positions A, B, C and D. When the result is A, it can be recognized that the pit is an address mark, and this segment is an address segment, which is the beginning of the frame. Therefore, frame synchronization can be achieved by clearing the frame counter.

Since one frame is composed of 14 segments, the clock selector 31 is controlled so that a window is opened every 14 segments, and when the address marks can be continuously recognized, it is determined that the frame synchronization is locked.

Since the position where the address is recorded can be recognized when the frame synchronization is applied, the address decoder (A
The DEC) 53 decodes the track address and the frame code. In this ADEC 53, it is performed by observing a pattern in which each 4 bits are gray-coded and the gray code table shown in FIG. 6 described above.

In the ADEC 53, the reproduced signals at the respective positions a, b, c, d shown in FIG. 6 are sampled, and the position where the amplitude value is maximum is found by the maximum difference detection method (differential detection method). Similarly, the reproduced signals at the positions e, f, g, and h shown in FIG. 6 are sampled, the position where the amplitude value is maximized is obtained, and decoding is performed by the combination of these and the gray code table. According to the above method, track addresses [AM] to [A]
L], parity [P], frame address [FM],
[FL] is decoded and the result is stored in the register.

The DSP 67 can detect the current position of the pickup 29 by reading this register when these data are confirmed. However, since it is greycoded not only for 4 bits but for the whole, it is not a simple match, but the LSB of the upper 4 bits.
Is compared with the inverted table depending on whether is "1" or "0".

Here, the first decoded frame code is loaded into the frame counter, and the numerical value obtained by incrementing this frame counter for each frame is compared with the actual reproduced frame code to continuously When it is confirmed that they match, it is assumed that rotation synchronization has been applied. After that, the numerical value obtained by the frame counter is returned to the DSP 67 as a frame code so that the frame position is not erroneously recognized even if there are some defects.

Further, the ADEC 53 decodes the GCP information by the same method as the track address and the frame code. However, not the address segment, but G
GCP segment in which CP information is recorded GCPse
By reading the register contents with g, the contents of the GCP area ARgcp can be confirmed.

Further, the DSP 67 picks up the pickup 29 while reading the gray coded track address.
The speed of the pickup 2 is calculated from the PWM circuit 65 via the slide driver of the pickup driver 64.
The pickup 9 is moved to the target track by controlling the slide motor of 9.

When the pickup 29 reaches the target track, the tracking operation is started. As described above, the tracking error signal is obtained by taking the difference between the amplitude values of the RF signal for the two wobble pits in the servo area. The DSP 67 forms a servo loop for tracking control by feeding back this value as tracking control data obtained by digitally filtering it from the PWM circuit 65 to the galvano driver and the slide driver of the pickup driver 64. The slide motor is driven by the slide driver to control the fluctuation of the low frequency component, and the galvano driver is used for the pickup 29.
The tracking control is performed so that the laser spot is located at the center of the track by driving the galvano motor of.

The head position of the target sector is detected with such tracking applied. As described above, there is a sector mark in the segment at the beginning of each sector and the segment immediately before it. Each sector mark controls the clock selector 51 so as to open a window at the four positions A, B, C, D shown in FIG. 5, and is sampled at these four positions A, B, C, D. When the position of maximum amplitude in the RF signal is B, it indicates that it is the head segment of the sector, and when it is C, it indicates that it is the segment immediately before the head of the sector. Basically, the first segment of the sector is the host computer 23.
It is determined by converting the sector address given by the above into a physical sector and calculating which segment of which track the sector is.
The probability that different types of sector marks will be defective at the same time is 10 ⁻¹⁰ or less empirically, and the probability of occurrence of defective sectors due to this is extremely small.

Further, the data clock generation (DPLL) circuit 50 generates a data clock dclk that is M / N times the frame-synchronized servo clock sclk obtained by the SPLL 49, and uses this data clock dclk for the data system timing. Generator (DTG)
55 and the recording / reproducing circuit 56.

At the time of recording, the recording / reproducing circuit 56
The print data is supplied from the host computer 23 via the controller 41. And the above record /
The reproduction circuit 56 outputs, for example, 127 to the recorded data.
Y = X ⁷ by adding (EXOR) the random numbers of the cycles
The scramble processing according to + X is performed on a sector-by-sector basis, and the scrambled recording data is transferred to the data clock dc.
Modulates to NRZI series data synchronized with lk. At this time, the initial value is set to “0” for each segment. Then, the modulated signal wdat is supplied to the magnetic head 34 via the magnetic head driver 35. The magnetic head 34
Generates a magnetic field according to the modulation signal wdat, and the magneto-optical disk 2 is overheated to the Curie temperature by the laser beam emitted from the laser diode 10.
By applying to the data area ARd of No. 5, NRZ
Record I-series data.

During reproduction, the MO signal obtained by the I / V conversion block 33 from the output detected by the photodetector 32 is clamped to an appropriate potential by the selector & clamp circuit 57 and then the A / D converter 48.
It is A / D converted by and is supplied to the recording / reproducing circuit 56. Then, the recording / reproducing circuit 56
The MO signal digitized by the D / D converter 48 is subjected to digital filter processing that matches the partial response (1, 1), and then NRZ is performed by Viterbi decoding.
Reproduce the I-series data. Then, the NRZI series data is converted into NRZ system in segment units, then descrambled in sector units and then converted into reproduction data, and the reproduction data is transferred to the host computer 23 via the controller 41.

By scrambling the recorded data in this way, the data pattern is randomized, the probability that undetermined paths continue during Viterbi decoding is reduced, and the memory capacity can be reduced. By randomizing the pit arrangement on the ROM disk, the ratio of the presence or absence of pits on the board surface approaches 50%, and disk molding can be facilitated.

Next, the power consumption reduction operation of the magneto-optical disk recording / reproducing apparatus according to this embodiment will be described.

First, when performing recording or reproduction, the host computer 23 forms a command for specifying recording or reproduction, and supplies this to the controller 23 via the SCSI bus. The controller 23 supplies the command designating recording or reproduction to the command receiving unit 1 and the clock controller 5 via the input terminal 13 shown in FIG. The command receiving unit 1 converts this command into a data format that the timing generator 4 can handle, and supplies this to the timing generator 4.

For example, when one sector is one unit of recording / reproduction, and when recording / reproduction of two sectors is performed as shown in FIG. 16 (j), the command receiving section 1 is as shown in FIG. 16 (h). A high level command for 2 sectors is supplied to the timing generator 4.

The timing generator 4 is composed of various counters that operate with a clock synchronized with clock pits on the surface of the magneto-optical disk 25, that is, various counters that operate with the servo clock from the SPLL 49. Sector management for recording or reproducing is performed based on this count value, and as shown in FIG.
As shown in (i), high-level recording designation data (Write data) is supplied to the clock controller 5 during recording, and high-level reproduction designation data (Read data) is supplied to the clock controller 5 during reproduction.

Specifically, the timing generator 4 counts the servo clocks,
A servo area provided at the beginning of each segment is detected as indicated by the diagonal lines in FIG. 16A, and each time the servo area is detected, a high-level servo as shown in FIG. 16B is detected. In addition to forming the area detection data, the address segment (AS) shown in FIG. 9A recorded every 14 segments is detected, and the high level address segment detection data is formed each time the address segment is detected. To do. Further, the timing generator 4 detects the reference area which is provided at the head of each sector and performs recording / reproduction of the 2T pattern and the 8T pattern by counting the servo clocks, and detects the reference area which becomes high level during this period. A data segment (DS) shown in FIG. 16A, which forms data and records and reproduces the recorded data.
Is detected, and data segment detection data that is high level during this time is formed.

The main part of the timing generator 4 is as follows.
As shown in FIG. 17, the servo area detection data is transferred to the first NOR gate 8 via the input terminal 85.
The address segment detection data is supplied to the first and second NOR gates 83, and the address segment detection data is supplied to each of the N nodes
It is supplied to the OR gates 81 and 83. In addition, the reference area detection data is transmitted to the first terminal 87 via the input terminal 87.
And the data segment detection data is supplied to the second AND gate 84 via the input terminal 88.

Since each data supplied to the first NOR gate 81 is data indicating a servo area or an address segment, these data are stored in the first NOR gate 81.
By supplying it to the R gate 81, its output becomes low level when either becomes high level, and its output becomes high level when both become low level. That is, the output of the first NOR gate 81 becomes low level in the servo area or address segment as shown in FIG. 16C, and becomes high level in the data segment (DS) other than these areas. Become. Such a first NOR gate 8
The output from 1 is used as the data enable for the first A
It is supplied to the ND gate 82.

As described above, the first AND gate 8
In addition to the above data enable, reference area detection data that is at a high level is supplied to 2 during the reference area. Therefore, the output from the first AND gate 82 becomes high level during the reference area as shown in FIG. This first A
The output from the ND gate 82 is output terminal 8 as Ref data indicating the recording / reproducing position of the reference pattern.
It is supplied to the clock controller 5 via 9.

On the other hand, the second NOR gate 83 also has
The servo area detection data and the address segment detection data are supplied, and the output thereof is supplied to the second AND gate 84 as the data enable. The data segment detection data is supplied to the second AND gate 84 separately from the data enable. Therefore, the output of the second AND gate 84 becomes high level during the data segment other than the reference area as shown in FIG. 16 (e). The output from the second AND gate 84 is supplied to the clock controller 5 via the output terminal 90 as Daten data indicating the recording / reproducing position of the recording data.

The clock controller 5 is supplied through the input terminal 70 as shown in FIG.
2T pattern as shown in (f), 8T pattern as shown in (g), a data clock as recorded data and reproduced data, high level during recording and low level during reproduction, shown in (i). The first AND gate 72 to which the Write data and the Ref data indicating the reference area are supplied, the data clock, W
write data and Dat indicating the above data segment
a second AND gate 73 to which en data is supplied. Further, the third AND gate 74 is supplied with the data clock, the Read data and the Ref data, which are at the low level during recording and are at the high level during reproduction, and the third AND gate 74, to which the data clock, the Read data and the Date data are supplied. AND gate 7 of 4
5 and 5. Also, the command data, which becomes high level during recording and reproduction, the Read data and Wr.
It has an OR gate 77 to which the ite data is supplied, and a fifth AND gate 76 to which the data clock and the output of the OR gate 77 are supplied.

In the clock controller 5 having such a configuration, the OR gate 77 is
Since the high level Write data is supplied through the input terminal 77c, the output thereof becomes the high level, and the fifth clock (DCK1) corresponding to the data clock is output from the fifth AND gate 76 to the output terminal 78. It is supplied to the timing generator 4 shown in FIG. The timing generator 4 is in the operating state while the first clock is supplied, and performs the sector management described above.

Next, at the time of this recording, the first A
Since the high-level Write data is supplied to the ND gate 72, its output becomes data according to the 2T pattern and the 8T pattern in the reference area while the Ref data is at the high level. The output from the first AND gate 72 is the second clock (DC
K2) is supplied to the 2T pattern generation unit 6 and the 8T pattern generation unit 7 of the recording data forming unit 2 shown in FIG. 1 via the output terminal 72c.

Further, since the high level Write data is also supplied to the second AND gate 73, the output thereof becomes the data corresponding to the recording data in the data segment during the High level of the Daten data. . The output from the second AND gate 73 is supplied as the third clock (DCK3) to the data pattern generating section 8 of the recording data forming section 2 via the output terminal 73c.

The timing generator 4 is supplied with the 2T pattern, the 8T pattern and the recording data through the input terminal 14, and the 2T pattern, the 8T pattern and the recording data are supplied to the 2T pattern generating section 6 and the 8T pattern, respectively. Generation unit 7 and data pattern generation unit 8
Supply to.

The 2T pattern generating section 6 is in an operating state only when the second clock is supplied, and the second
2T pattern is generated based on the clock of
It is supplied to the controller 41 via the R gate 9 and the output terminal 15. As a result, the 2T pattern is recorded in the reference area of the magneto-optical disk 5 as described above.

The 8T pattern generating section 7 is in an operating state only when the second clock is supplied,
8T pattern is generated based on the clock of
It is supplied to the controller 41 via the R gate 9 and the output terminal 15. As a result, the 8T pattern is recorded in the reference area of the magneto-optical disk 5 as described above.

The data pattern generation unit 8 uses the third pattern
Only when the clock is supplied, the operating state is generated, the data pattern of the recording data is generated based on the third clock, and this is supplied to the controller 41 via the OR gate 9 and the output terminal 15. As a result, recording data is recorded in the data segment of the magneto-optical disk 5 as described above.

As described above, the 2T pattern generation section 6, the 8T pattern generation section 7 and the data pattern generation section 8 are described.
Becomes operational only when the second clock or the third clock is supplied. Therefore, when the 2T pattern generation unit 6 or the 8T pattern generation unit 7 is generating the 2T pattern or the 8T pattern, the data pattern generation unit 8 can be stopped and the power consumption can be reduced. be able to.

Further, the second clock is supplied to the 2T pattern generator 6 only when the 2T pattern is supplied as the data clock, and the 8T pattern generator 7 is supplied with the 8T pattern as the data clock. Only when this time, the second clock is supplied. For this reason,
At the time of generating the 2T pattern, the 8T pattern generating unit 7 can be stopped together with the data pattern generating unit 8, and conversely, at the time of generating the 8T pattern, the 2T pattern generating unit 6 together with the data pattern generating unit 8 are generated.
Since it can be stopped, power consumption can be reduced.

Further, the Daten data supplied as the data clock supplied to the second AND gate 73 is at the low level in the address segment as shown in FIG. 16 (e). Therefore, even when the data pattern generation unit 8 is generating a data pattern, the third clock supplied from the second AND gate 73 to the data pattern generation unit 8 is set to low level at the timing of this address segment. can do.
Therefore, even when the data pattern is being generated, the second AND gate 73 is generated at the timing of the address segment.
Can be stopped, and power consumption can be reduced.

On the other hand, at the time of this recording, the input terminals 74a and 75a are connected to the third and fourth AND gates 74 and 75, respectively.
Low level Read data is supplied via. As a result, the fourth clock (DCK4) output from the third AND gate 74 and the fourth AND gate 7
The fifth clock (DCK5) output from 5 becomes low level and is supplied to the data reproducing unit 3 via the output terminals 74c and 75c, respectively. The fourth clock is
The clock is for driving the 2T pattern processing unit 10 and the 8T pattern processing unit 11 of the data reproducing unit 3.
When the fourth clock becomes low level, the 2T pattern processing unit 10 and the 8T pattern processing unit 11 are stopped. Further, the fifth clock is a clock for driving the data detection unit 12, and when the fifth clock becomes low level, the data detection unit 12 is stopped.

Therefore, at the time of recording, the entire data reproducing section 3 can be stopped, and the power consumption can be reduced.

Next, at the time of reproduction, the high level Read data is supplied to the OR gate 77 through the input terminal 77c, so that the output becomes high level and the fifth level
From the AND gate 76, the first clock (DCK1) corresponding to the data clock is supplied to the timing generator 4 shown in FIG. As described above, the timing generator 4 is in the operating state while the first clock is supplied, and performs the sector management described above.

Next, at the time of this reproduction, the third A
Since the high-level Read data is supplied to the ND gate 74, its output becomes data according to the 2T pattern and the 8T pattern in the reference area during the time when the Ref data is high level. This third A
The fourth clock from the ND gate 74 is supplied to the 2T pattern processing unit 10 and the 8T pattern processing unit 11 of the data reproducing unit 3 via the output terminal 74c.

Further, since the high level Read data is also supplied to the fourth AND gate 75, its output becomes data according to the reproduced data in the data segment during the time when the Date data becomes high level. . The fifth clock from the fourth AND gate 75 is supplied to the data detecting section 12 of the data reproducing section 3 via the output terminal 73c.

The timing generator 4 is supplied with the 2T pattern, the 8T pattern and the reproduction data through the input terminal 14. The 2T pattern, the 8T pattern and the reproduction data are supplied to the 2T pattern processing section 10 and the 8T pattern, respectively. The data is supplied to the processing unit 11 and the data detection unit 12.

The 2T pattern processing section 10 includes the fourth
Only when the second clock is supplied, the operation state is established, the 2T pattern is reproduced based on the fourth clock, and this is supplied to the data detection unit 12.

The 8T pattern processing section 11 uses the fifth
Only when the clock is supplied, the 8T pattern is reproduced based on the fifth clock, and the 8T pattern is supplied to the data detector 12.

The data detection unit 12 reproduces reproduction data based on the 2T pattern reproduced by the 2T pattern processing unit 10 and the 8T pattern reproduced by the 8T pattern processing unit 11, and outputs the reproduction data via the output terminal 16. To the controller 41.

The controller 41 supplies the reproduction data to the host computer 23 via the SCSI bus 24. As a result, the host computer 23
Can perform data processing based on the reproduction data reproduced from the magneto-optical disk 25.

As described above, the 2T pattern processing section 1
The 0,8T pattern processing unit 11 and the data detection unit 12 are
Only when the fourth clock or the fifth clock is supplied, the operation state is set. Therefore, when the 2T pattern processing unit 10 or the 8T pattern processing unit 11 is reproducing the 2T pattern or the 8T pattern, the data detection unit 12 can be stopped and power consumption can be reduced. You can

Further, the 4T clock is supplied to the 2T pattern processing unit 10 only when the 2T pattern is supplied as the data clock, and the 8T pattern processing unit 11 is supplied with the 8T pattern as the data clock. Only when this time, the fourth clock is supplied. Therefore, when reproducing the 2T pattern, the 8T pattern processing unit 11 together with the data detecting unit 12 can be stopped, and conversely, when reproducing the 8T pattern,
Since the 2T pattern processing unit 10 can be stopped together with the data detection unit 12, power consumption can be reduced.

On the other hand, during this reproduction, the input terminals 72a and 73a are connected to the first and second AND gates 72 and 73, respectively.
Low level Write data is supplied via the.
As a result, the second clock (DCK2) output from the first AND gate 72 and the third clock (DCK3) output from the second AND gate 73 become low level, and the output terminals 72c and 73c, respectively. It is supplied to the recording data forming unit 2 via. The second clock is a clock for driving the 2T pattern generating unit 6 and the 8T pattern generating unit 7 of the recording data forming unit 2. When the second clock becomes low level, the 2T pattern is generated. Generation unit 6 and 8T pattern generation unit 7
Will be stopped. Further, the third clock is a clock for driving the data pattern generation unit 8, and when the third clock becomes low level, the data pattern generation unit 8 is stopped.

Therefore, at the time of reproduction, the entire data pattern generating section 8 can be stopped and power consumption can be reduced.

Next, except when recording and reproducing, command data, Write data and Re supplied to the OR gate 77 through the respective input terminals 77a to 77c.
All the ad data are low level. Therefore, the first clock (DCK1) supplied from the fifth AND gate 76 to the timing generator 4 becomes low level, and the timing generator 4 is stopped. As described above, the timing generator 4 is
Since various clocks for operating the recording data forming unit 2, the data reproducing unit 3 and the clock controller 5 are formed and output, the timing is set by stopping these clocks at times other than recording and reproducing. Not only the generator 4 but also the recording data forming unit 2, the data reproducing unit 3, and the clock controller 5 can be stopped, and a large reduction in power consumption can be achieved.

The applicant of the present invention made a prototype of the magneto-optical disk recording / reproducing apparatus according to this embodiment, and conducted an experiment.
It was possible to reduce the conventional power consumption of 1 W to 250 mW or less.

If a disk-shaped recording medium such as a magneto-optical disk of the sample servo system is used, a stable servo clock can be formed from a servo pattern previously recorded on the disk surface. Therefore, this servo clock should be counted. Thus, the recording / reproducing position on the board can be completely grasped. Therefore, desired timing clocks (the first to fifth clocks DCK1 to DCK5) can be easily formed, and the power consumption reduction operation as described above can be enabled.

Further, by controlling the clock generated by the timing generator 4 so that only the clock necessary for recording or reproduction is generated, it is possible to further reduce the power consumption. Further, by stopping the power supply together with the clocks supplied to the above respective parts, it is possible to further reduce the power consumption.

Finally, in the above description of the embodiments, the disc-shaped recording medium recording and reproducing apparatus according to the present invention is applied to a magneto-optical disk recording / reproducing apparatus, which is based on the sample servo system. It can be applied to a reproducing device, a recording device, or a recording / reproducing device of other disk-shaped recording media such as a magnetic disk, a compact disc, a write-once, etc. as long as it operates, and the technical idea according to the present invention. It goes without saying that various modifications can be made without departing from the range.

[0144]

The recording device and the reproducing device for the disk-shaped recording medium according to the present invention can reduce power consumption.

Further, in the disk-shaped recording medium of the sample servo system, a stable clock can be formed from the servo pattern previously recorded on the surface of the disk, and a counter synchronized with this can be provided to record / reproduce on the surface of the disk. The position can be accurately grasped. Therefore, desired timing can be easily formed, and power consumption can be appropriately reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a recording device and a reproducing device for a disc-shaped recording medium according to the present invention.

FIG. 2 is a block diagram of a magneto-optical disk recording / reproducing apparatus when the disk-shaped recording medium recording apparatus and reproducing apparatus according to the present invention is applied to the magneto-optical disk recording / reproducing apparatus.

FIG. 3 is a diagram showing a segment structure of a magneto-optical disk recorded / reproduced by the magneto-optical disk recording / reproducing apparatus.

FIG. 4 is a diagram showing a format of a servo area in the magneto-optical disk.

FIG. 5 is a diagram for explaining how to detect the first pit in the servo area of the magneto-optical disk.

FIG. 6 is a diagram showing a format of an access code recorded in an address segment of the magneto-optical disc.

FIG. 7 is a diagram showing an example of the access code.

FIG. 8 is a diagram showing a format of a data segment in the magneto-optical disc.

FIG. 9 is a diagram showing a format of a servo area in a ROM disc.

FIG. 10 is a diagram showing a reference pattern of a data sector in the magneto-optical disk.

FIG. 11 is a diagram showing setting parameters for zone division in the magneto-optical disk.

FIG. 12 is a diagram showing a state of zone division in the magneto-optical disk.

FIG. 13 is a diagram showing a data sector format in the magneto-optical disk.

FIG. 14 is a diagram showing an arrangement state of GCP segments in the magneto-optical disk.

FIG. 15 is a diagram showing a structure of the GCP segment.

FIG. 16 is a time chart for explaining a power consumption reducing operation of the magneto-optical disc recording / reproducing apparatus in the example.

FIG. 17 is a block diagram of a circuit that supplies Ref data and Date data to the clock controller.

FIG. 18 is a block diagram showing a configuration of a clock controller provided in the magneto-optical disc recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Command receiving section 2 Recorded data forming section 3 Data reproducing section 4 Timing generator 5 Clock controller 6 2T pattern generating section 7 8T pattern generating section 8 Data pattern generating section 9 OR gate 10 2T pattern processing section 11 8T pattern processing section 12 Data detection Part 13 Command data input terminal 14 Data clock input terminal 15 Recorded data output terminal 16 Reproduced data output terminal

Claims (7)

[Claims] 1. A disk-shaped recording in which desired recording data is recorded by a recording means on a disk-shaped recording medium having a plurality of servo areas in which predetermined servo patterns are arranged at predetermined intervals and using the servo areas as data areas. In a recording device of a medium, a reference pattern forming means for forming a reference pattern to be recorded for each predetermined recording unit and supplying it to the recording means, and a data pattern for forming a data pattern of recording data and supplying it to the recording means. When the reference pattern is formed by the forming means and the reference pattern forming means, the data pattern forming means is stopped, and when the data pattern of the recording data is formed by the data pattern forming means, the reference pattern is formed. Control to stop the pattern forming means A recording device for a disc-shaped recording medium having a control means. 2. The reference pattern forming means comprises:
The control unit includes a first reference pattern forming unit that forms a predetermined first reference pattern and a second reference pattern forming unit that forms a predetermined second reference pattern. When the data pattern of the recording data is formed by the pattern forming means,
When the first reference pattern forming means forms the first reference pattern, the second reference pattern forming means is stopped, and the second reference pattern forming means forms the second reference pattern. The recording apparatus for a disk-shaped recording medium according to claim 1, wherein the first reference pattern forming means is sometimes stopped. 3. A position information recording area detection unit for detecting a position information recording area in which position information is recorded in advance is provided on the disc-shaped recording medium at predetermined intervals, and the control unit includes: 3. The recording means is stopped for each of the position information recording areas based on the detection output from the position information recording area detecting means.
A recording device for the disk-shaped recording medium described. 4. A system clock output means for outputting a system clock required for recording, wherein the control means, when recording is not actually performed,
4. The disk-shaped recording medium recording apparatus according to claim 3, wherein the system clock output means is stopped. 5. A servo area from a disk-shaped recording medium having a plurality of servo areas in which predetermined servo patterns are arranged at predetermined intervals and a reference area in which a predetermined reference pattern is recorded for each predetermined recording unit. A reproducing device of a disk-shaped recording medium for reproducing reproduction data recorded in a data area between the reference areas, the reference pattern detecting means for detecting a reference pattern reproduced from the reference area, and the reference pattern detecting means. Data detection means for reproducing the reproduction data based on the reference pattern, and when the reference pattern detection means is detecting the reference pattern, the data detection means is stopped and the data detection means detects the reproduction data. When detection is taking place A reproducing device for a disk-shaped recording medium, comprising: a control means for stopping the reference pattern detection means. 6. The disc-shaped recording medium has first and second predetermined different reference patterns, respectively.
Of the reference pattern are recorded, and the reference pattern detecting means is a first reference pattern detecting means for detecting the first reference pattern and a second reference pattern detecting means for detecting the second reference pattern. When the first reference pattern detection unit is detecting the first reference pattern, the control unit stops the second reference pattern detection unit together with the data detection unit, 6. The first reference pattern detecting means together with the data detecting means is stopped when the second reference pattern detecting means is detecting the second reference pattern. Playback device for disk-shaped recording media. 7. A system clock output means for outputting a system clock necessary for reproduction is provided, wherein the control means, when reproduction is not actually performed,
7. The disc-shaped recording medium reproducing apparatus according to claim 6, wherein the system clock output means is stopped.