JPH11175977A - Optical disk device and trial write method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent double write (overwrite) at the time of trial writing in a test area. SOLUTION: In OPC(optimum power control), the number of times (count number) of the trial write in the test area isn't judged from only the record (number of written frames) in a count area, but by detecting an EFM(eight to fourteen modulation) signal really written in the test area, whether or not a write-in planned place in the test area is unrecorded is judged (step 104), and after the fact that all write-in planned places are unrecorded is judged, the trial write is performed on its place. Further, the write-in planned place is obtained from the count number of the count area (step 103). Further, when the count number of the count area is mistaken, its correction is performed (steps 106, 115).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device and a test writing method.

[0002]

2. Description of the Related Art An optical disk device for recording or recording / reproducing an optical disk (for example, a CD-R drive device, a CD
-WR drive device) is known.

In an optical disk device having such an information recording function, before actually writing (recording) the information, an optimum recording power (output of laser light) suitable for characteristics and environmental conditions specific to the optical disk. ).

[0004] Determining the optimum recording power is called OPC.
(Optimum Power Control). OPC is a PCA (Power Calibration Are) at the innermost circumference of the optical disc.
This is done in an area called a). The PCA has a test area (Test Area) and a count area (Count Area).
t Area).

In the test area, test writing is performed while changing the laser beam output stepwise, and in the count area, the number of times of the test writing (the number of OPCs) is recorded.

In this case, before performing a new OPC, the recording of the count area is always checked and the number of OPCs written on the optical disk before that is checked.

However, for some reason, even if a test write is performed in the test area, the fact may not be recorded in the count area. That is, the number of trial writings recorded in the count area may be smaller than the actual number.

When a new test write is to be performed in the test area, the portion to be written in the test area is specified only by the information on the number of times of recording in the count area. If there is, the written portion of the test area is overwritten again (overwriting), and as a result, the OP
C fails (appropriate laser light output cannot be obtained). If information is recorded with an inappropriate laser beam output, the optical disc may be seriously damaged.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disk apparatus and a test writing method capable of appropriately setting (OPC) the output of a laser.

[0010]

This and other objects are achieved by the present invention which is defined below as (1) to (7).

(1) An optical disk apparatus for recording or recording / reproducing information on or from an optical disk having a test area for performing test writing, comprising: a motor for rotating the optical disk; and a motor movable at least in a radial direction of the optical disk. An optical head capable of writing information by irradiating laser light, and control means for controlling the operation of the optical head, the test area when performing test writing to determine the output of the laser light An optical disc device characterized in that it is configured to detect whether or not a portion to be written has been recorded, and to perform test writing only on an unrecorded portion.

(2) An optical disc apparatus for recording, recording, or reproducing data on or from an optical disc having a test area for performing test writing and a count area for recording the number of times test writing has been performed in the test area. A motor that can move at least in the radial direction of the optical disk, and can write information by irradiating the optical disk with laser light, and control means for controlling the operation of the optical head. When performing test writing to determine the light output, it is detected whether or not the planned write area of the test area detected based on the recording of the count area has been recorded, and writing is performed only on the unrecorded area. An optical disk device characterized by being configured to perform the operation.

(3) The optical disk device according to (2), which has a function of correcting an error in recording of the count area when the recording is incorrect.

(4) A method for performing test writing on the test area of an optical disk having a test area for performing test writing, wherein it is detected whether or not a portion to be written in the test area has been recorded, and an unrecorded portion is detected. A test writing method characterized in that writing is performed only on a.

(5) A method for performing test writing on the test area of an optical disc having a test area for performing test writing and a count area for recording the number of times test writing has been performed on the test area, the method comprising: Test writing, wherein a portion to be written in the test area is detected based on the recording, then whether or not the portion to be written is recorded is detected, and writing is performed only to an unrecorded portion. Method.

(6) The test writing method according to the above (5), wherein when the recording of the count area is erroneous, it is corrected.

(7) The test writing method according to any one of (4) to (6), wherein the test writing is performed to determine an output of a laser beam when recording on an optical disk.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk apparatus and a test writing method according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a block diagram showing a state in which the optical disk device of the present invention is connected to a computer, and FIG. 2 is a block diagram showing an embodiment of the optical disk device of the present invention.

The optical disk device 1 shown in these figures is a CD-R drive device for recording and reproducing an optical disk (CD-R) 2.

A spiral pre-groove (WOBBLE: not shown) is formed on the optical disk 2.

The pre-groove meanders at a predetermined cycle (22.05 kHz at 1 × speed), and the pre-groove includes an ATIP (Absolute Time In Pre-Groove).
) Information (time information) is recorded. In this case, A
The TIP information is bi-phase modulated.
It is FM-modulated and recorded at a carrier frequency of 05 kHz.

The pregroove functions as a guide groove when forming pits / lands on the optical disk 2 (pit / land recording). Also, this pre-groove is played,
It is used for controlling the rotation speed of the optical disc 2 and for specifying the recording position (absolute time) on the optical disc 2.

The optical disk device 1 includes a turntable and a spindle motor 8 for rotating the turntable (for rotating the optical disk), and has a rotation drive mechanism (not shown) for mounting and rotating the optical disk 2 on the turntable. A Hall element 9 is installed near the spindle motor 8 as a sensor for detecting the rotation of the spindle motor 8. The FG signal (sine wave) is output from the Hall element 9 with the rotation of the spindle motor 8. The period of the FG signal corresponds to the rotation speed of the spindle motor 8.

Further, the optical disk device 1 includes an optical head (optical pickup: PU) 3 that can move in the radial direction of the optical disk 2 (radial direction of the turntable) with respect to the loaded optical disk 2 (turntable). An optical head main body moving mechanism (not shown) including a thread motor 5 for moving the optical head 3 in the radial direction, that is, an optical head main body (optical pickup base) of the optical head 3 to be described later in the radial direction; And 11;
PWM signal smoothing filters (smoothing circuits) 7 and 12
Control means 13, laser control unit 14, HF signal generation circuit 15, HF signal gain switching circuit 16, peak / bottom detection circuit 17, error signal generation circuit 18,
, A WOBBLE signal detection circuit 19, a CD servo controller 21, and a WOBBLE servo controller 22
FG signal binarization circuit 23, EFM / CDROM encoder control unit 24, memories 25, 26 and 29
, Sync signal generation / ATIP decoder 27, CDR
OM decoder control unit 28 and interface control unit 3
1 and clocks 32, 33, 34 and 35, and a casing 10 for accommodating them. Hereinafter, the radial direction of the optical disk 2 is simply referred to as “radial direction”.

The optical head 3 includes an optical head body (optical pickup base) (not shown) provided with a laser diode (laser light source) and a split photodiode (light receiving element).
And an objective lens (condensing lens). The laser diode is driven by a laser control unit (control means) 1
4.

The objective lens is supported by a suspension spring (not shown) provided on the optical head main body, and can move in the radial direction and the rotation axis direction of the optical disk 2 (turntable) with respect to the optical head main body. ing. When the objective lens deviates from its neutral position (middle point), the objective lens is urged toward the neutral position by the restoring force of the suspension spring. Hereinafter, the direction of the rotation axis of the optical disc 2 will be simply referred to as “the direction of the rotation axis”.

The optical head 3 has an actuator 4 for moving the objective lens in the radial direction and the rotation axis direction with respect to the optical head body.

The control means 13 comprises a microcomputer (CPU), and includes an optical head 3 (actuator 4), a sled motor 5, a spindle motor 8, a laser control unit 14, an HF signal gain switching circuit 16, a peak / bottom detection circuit. 17, CD servo controller 21,
WOBBLE servo controller 22, EFM / CDR
OM encoder control unit 24, memories 25, 26, 2
9. Sync signal generation / ATIP decoder 27, CDRO
M decoder control unit 28, interface control unit 31
For example, the entire optical disk device 1 is controlled.

The address, data, and COMMAN are sent from the control means 13 via the address / data bus 36.
D (command) and the like are input to the EFM / CDROM encoder control unit 24, the memory 26, the sync signal generation / ATIP decoder 27, the CDROM decoder control unit 28, the interface control unit 31, and the like.

An external device (a computer 41 in this embodiment) is detachably connected to the optical disk device 1 via an interface control section 31 so that communication between the optical disk device 1 and the computer 41 can be performed. it can.

The interface control unit 31 includes, for example, ATAPI (IDE) (Attape standard), SC
SI (squay standard) or the like is used.

The computer 41 has a keyboard 4
2. The mouse 43 and the monitor 44 are connected respectively.

The transmission means is constituted by the interface control section 31. HF signal generation circuit 1
5, HF signal gain switching circuit 16, peak / bottom detection circuit 17, error signal generation circuit 18, WOBBLE
The signal detection circuit 19, the CD servo controller 21 and the WOBBLE servo controller 22 constitute a signal processing unit.

Next, the operation of the optical disk device 1 will be described. The optical disc device 1 records (writes) and reproduces (reads) information (data) on the optical disc 2 while performing focus control, tracking control, thread control, and rotation speed control (rotation speed control) on a predetermined track. I do. Hereinafter, recording, reproduction, focus control, tracking control and thread control,
The operation at the time of rotation speed control (rotation speed control) will be described.

First, as a premise, as shown in FIG. 2, a predetermined COMMAND signal is input from the control means 13 to the CD servo controller 21. Control means 1
From 3, a predetermined COMMAND signal is input to the WOBBLE servo controller 22.

This COMMAND signal is supplied to the control means 13
Is a signal indicating a predetermined command (for example, start of control, etc.) to the CD servo controller 21 or the WOBBLE servo controller 22 from the controller.

Then, a predetermined STATUS signal is input to the control means 13 from the CD servo controller 21. Further, a predetermined STATUS signal is input from the WOBBLE servo controller 22 to the control means 13.

The STATUS signal is a signal indicating a response to the command, ie, information on the control (for example, statuses such as control success, control failure, and control execution).

[Recording] Recording (writing) data (signal) on the optical disk 2
At this time, the pre-groove formed on the optical disc 2 is reproduced (read), and thereafter, data is recorded along the pre-groove.

When data (signal) to be recorded on the optical disk 2 is input to the optical disk device 1 via the interface control unit 31, the data is transmitted to the EFM / CRO.
It is input to the M encoder control unit 24.

In the EFM / CDROM encoder control section 24, the data is encoded (at the timing of the clock signal) based on the clock signal from the clock 34, and is modulated by a modulation method called EFM (Eight to Fourteen Modulation). EFM modulation) and ENC
This is an ORDE EFM signal.

As shown in FIG. 3, this ENCODE
The EFM signal is a signal composed of pulses having a length (period) of 3T to 11T.

As shown in FIGS. 4 and 5, EF
In the M / CDROM encoder control unit 24, the clock 3
4 is divided to generate a SUBCODE-SYNC signal (subcode sync signal) composed of pulses of a predetermined cycle. This SUBCODE-SY
Cycle of NC signal pulse (interval between adjacent pulses)
Is 1/75 second at 1 × speed.

At the time of the encoding, a synchronization signal, that is, a SYNC pattern (sync pattern) is transmitted to the SU.
Based on the BCODE-SYNC signal (SUBCODE
-At the timing of the SYNC signal), the ENCODE
It is added to the EFM signal. That is, SYNC is added to the portion corresponding to the head of each subcode frame.
A pattern is added.

This ENCODE EFM signal is EF
The data is input from the M / CDROM encoder control unit 24 to the laser control unit 14.

Also, WRITE P which is an analog signal
An OWER signal (voltage) is output from a D / A converter (not shown) built in
Is input to

The laser control section 14 has an ENCODE E
On the basis of the FM signal, the WRITE
The level of the POWER signal is switched between a high level (H) and a low level (L) and output, whereby the driving of the laser diode of the optical head 3 is controlled.

More specifically, the laser control unit 14
While the level of the ORDE EFM signal is high (H), the level of the WRITE POWER signal is set to high (H) and output. That is, the output of the laser is increased (write output). And ENCODE
While the level of the EFM signal is low (L), the WRI
The level of the TE POWER signal is set to a low level (L) and output. That is, the output of the laser is reduced (return to read output).

As a result, the optical disk 2 has an ENCO
When the level of the RDE EFM signal is high (H), a pit of a predetermined length is written, and ENCODE EFM is written.
When the level of the FM signal is low (L), a land of a predetermined length is written.

In this way, data is written (recorded) on a predetermined track of the optical disc 2.

EFM / CDROM encoder control unit 24
In, a predetermined ENCODE EFM signal (random EFM signal) is generated in addition to the above-mentioned ENCODE EFM signal. This random EFM signal is used for laser output adjustment (power control) at the time of test writing in a test area in OPC (Optimum Power Control) for determining laser output.

The OPC will be described with reference to FIGS. In the optical disc 2 by CD-R, a lead-in area having ATIP special information, a PMA (Program Memory Area),
CA (Power Calibration Area) is sequentially set (see FIG. 16). The PMA is an area in which the start and end times of a track are written.

The PCA is further divided into a test area for trial writing and a count area for recording the count number (see FIG. 17). The test area is 1
There is a space of 5 ATIP frames x 100, and accordingly, the count area is 1 ATIP frame x 1
There are 00 spaces.

At the time of trial writing in the test area, the random EFM signal is input from the EFM / CDROM encoder control unit 24 to the laser control unit 14. Also,
The control means 13 has 15 levels of WRITE P
An OWER signal is generated and its WRITE POWER
The signal is output from a D / A converter (not shown) built in the control unit 13 and input to the laser control unit 14.

Then, based on the random EFM signal, the laser control unit 14
The level of the E POWER signal is switched between a high level (H) and a low level (L) and output, thereby controlling the driving of the laser diode of the optical head 3. This is performed for each of the WRITE POWER signals of 15 levels.

In this way, the test writing to the test area is performed with the laser light having the 15-step output. This trial writing can be performed 100 times. Each time trial writing is performed, a flag indicating that fact is set in the count area (recorded for one ATIP frame).

Assuming that the amount of shift between the centers of the waveforms of the 3T signal and the 11T signal in the random EFM signal is β, of the 15 types of β corresponding to the WRITE POWER signal in the 15 levels, the β is closest to 4%. The laser output of the object is determined as an appropriate laser output.

As shown in FIGS. 16 and 17, the lead-in area start time T3, the program area start time (lead-in area end time) T4, and the lead-out area final possible start time T5 are each included in the ATIP information. Is encoded. And the PMA start time T
2 and the PCA start time T1 are grasped as positions moved to the inner peripheral side of the disc for a predetermined time with reference to the above T3.
The same applies to the boundary between the test area and the count area. As described above, in the OPC, the write position in the test area and the count area can be specified based on the ATIP information and the like.

When data is written to the optical disk 2, a read-out laser beam is emitted from the laser diode of the optical head 3 to the pre-groove of the optical disk 2, and the reflected light is received by the divided photodiode of the optical head 3. Is done.

The WOBBLE signal shown in FIG. 6 is output from the divided photodiode. As described above, the WOBBLE signal includes a signal having a frequency of 22.05 kHz at 1 × speed, and a signal obtained by performing biphase modulation on ATIP information and further performing FM modulation at a carrier frequency of 22.05 kHz.

The WOBBLE signal is input to the WOBBLE signal detection circuit 19 and is binarized by the WOBBLE signal detection circuit 19.

The binarized WOBBLE signal is the WOB signal.
This is input to the BLE servo controller 22.

In the WOBBLE servo controller 22, the FM-modulated AT of the WOBBLE signal is used.
The IP information is demodulated to obtain a BIDATA signal (bi-phase data signal) shown in FIG. This BIDATA signal is a signal (pulse signal) of 1T to 3T. Note that this BIDATA signal is bi-phase demodulated and then decoded to obtain ATIP information.

The WOBBLE servo controller 2
2, a digital PLL circuit (not shown) generates a clock based on the BIDATA signal,
The BICLOCK signal shown in FIG. 7 is obtained. This BICLO
The CK signal is used for decoding timing of a BIDATA signal described later.

The BIDATA signal and the BICLOC
The K signals are input to the sync signal generation / ATIP decoder 27, respectively.

The sync signal generation / ATIP decoder 27 bi-phase demodulates the BIDATA signal based on the BICLOCK signal, and then decodes and decodes the ATIP signal.
Information is obtained, and an ATIP-SYNC signal (ATIP sync signal) shown in FIG. 7 is generated.

In this case, as shown in FIG.
When a SYNC pattern included in the A signal is detected, a pulse of the ATIP-SYNC signal is generated. The period of the pulse of the ATIP-SYNC signal (the interval between adjacent pulses) is 1/75 second at 1 × speed.

This ATIP-SYNC signal is input to each of the control means 13 and the WOBBLE servo controller 22.

The decoded ATIP information is input to the control means 13. The control means 13 grasps the absolute time on the optical disc 2 based on the ATIP information.

The SUBCODE-SYNC signal from the EFM / CDROM encoder control unit 24 is input to a sync signal generation / ATIP decoder 27.
And WOBBLE servo controller 22.

FIG. 8 is a diagram showing the format of an ATIP frame. As shown in the figure, the data of the ATIP frame is a 4-bit synchronization signal, that is, a sync (S
yn), an 8-bit minute (Min), an 8-bit second (Sec), an 8-bit frame, and a 14-bit error detection code (CRC: Cyclic Redundancy Code).

The WOBB servo controller 22 detects an error in the ATIP information for each ATIP frame (determines whether the ATIP information is incorrect).

In the error detection of the ATIP information, the ATI
"Normal" means that the result of performing a predetermined operation on the Sync, minute (Min), second (Sec) and frame data of the P frame matches the error detection code (CRC), Say "ATIP error."

In this case, as shown in FIG.
In the E servo controller 22, an error in the ATIP information,
That is, when an ATIP error is detected, a pulse 51 is generated and output.

ATIP E composed of this pulse 51
The RROR signal is input to a counter (counter) 131 of the controller 13. And this counter 13
1, the number of pulses of the ATIP ERROR signal becomes A
It is counted (measured) as a TIP error.

The error detection of the ATIP information is performed by the ATIP
Since it is performed for each frame, the ATIP error is 75 A
There are a maximum of 75 TIP frames (1 second at 1 × speed).

The WOBBLE servo controller 2
2 constitutes a detecting means for detecting an ATIP error.

The count value of the ATIP error is stored in the memory 26 and the interface control unit 3
1 and transmitted to the computer 41 for use in the inspection of the optical disk device 1 (determination of the recording capability of the optical disk device 1).

The ATIP-input to the control means 13
The SYNC signal is used for updating the ATIP time information.

The WOBBLE servo controller 2
2, the ATIP-SYNC signal is input to the SUBCO
Used for synchronization with the DE-SYNC signal.

SUBCODE input to the control means 13
The -SYNC signal is used for interpolation of ATIP time information and measurement of the ATIP error described above.

The WOBBLE servo controller 2
The SUBCODE-SYNC signal input to 2 is used as a reference signal for synchronization, like the ATIP-SYNC signal.

The synchronization is performed so that the position of the SUBCODE-SYNC signal in the EFM data generated at the time of writing substantially coincides with the position on the optical disk 2 where the ATIP-SYNC signal is generated.

As shown in FIG. 9, SUBCODE-SY
The difference between the NC signal and the ATIP-SYNC signal is usually
± 2E at each part of the entire optical disc 2
Up to FM frames are allowed.

[Reproduction] When reproducing (reading) data (signal) from the optical disk 2, the WRITE POW from the laser control unit 14 is used.
The level of the ER signal is a constant D corresponding to the read output.
The output is held at the C level, whereby the output of the laser is held at the read output. The read output (output of the main beam) is usually set to 0.7 mW or less.

When reading data from the optical disk 2,
A read output laser beam is radiated from a laser diode of the optical head 3 onto a predetermined track of the optical disc 2,
The reflected light is received by the split photodiode of the optical head 3.

Currents (voltages) corresponding to the amounts of received light are output from the respective light receiving portions of the divided photodiodes, and these currents, ie, each signal (detection signal) is
Each is input to the HF signal generation circuit 15 and the error signal generation circuit 18.

The HF signal generation circuit 15 generates an HF (RF) signal by adding or subtracting these detection signals.

The HF signal is an analog signal corresponding to pits and lands written on the optical disk 2.

This HF signal is input to the HF signal gain switching circuit 16 and is amplified. The amplification factor (gain) of the HF signal gain switching circuit 16 is
Is switched by a gain switching signal from the controller.

This amplified HF signal (hereinafter simply referred to as “HF signal”
Signal) is input to each of the peak / bottom detection circuit 17 and the CD servo controller 21.

Further, the peak / bottom detection circuit 17 includes:
A tracking error (TE) signal described in the focus control, tracking control, and sled control is input.

As shown in FIG. 10, the peak / bottom detection circuit 17 extracts an amplitude (envelope) of an input signal, for example, an HF signal or a tracking error signal.

The upper side of the amplitude is called PEEK (TOP), the lower side of the amplitude is called BOTTOM, the signal corresponding to the upper side of the amplitude is called a PEEK (TOP) signal, and the signal corresponding to the lower side of the amplitude is called a BOTTOM signal.

The PEEK signal and BOTTOM signal are
A (not shown) built in the control means 13
The signal is input to a / D converter, and is converted into a digital signal by the A / D converter.

The PEEK signal and the BOTTOM signal include, for example, amplitude measurement, amplitude adjustment of a tracking error signal, detection of the presence or absence of a random EFM signal on a test area in the OPC, calculation of β (β value), and presence or absence of an HF signal. It is used for the judgment of etc.

In the CD servo controller 21, the HF signal is binarized, EFM demodulated, and an EFM signal is obtained. This EFM signal is a signal composed of pulses having a length (period) of 3T to 11T.

The CD servo controller 21 responds to the EFM signal by a CIRC (Cross Interl
Error correction (CIRC error correction) using an error correction code called “eaved Read Solomon Code” is performed twice.

In this case, the first CIRC correction is called C1 error correction, and the second CIRC correction is called C2 error correction.

The case where the first CIRC correction, ie, the C1 error correction cannot be performed, is referred to as “C1 error”. The case where the second CIRC correction, ie, the C2 error correction cannot be performed, is referred to as “C2 error”.

As shown in FIG. 11, in the CD servo controller 21, when a C1 error is detected during the C1 error correction, a pulse 52 is generated and output.

C1ERROR composed of the pulse 52
The R signal is input to the counter 131 of the control means 13. The counter counts (measures) the number of pulses of the C1ERROR signal as a C1 error.

Since one subcode frame is composed of 98 EFM frames, the C1 error and the C2 error are
75 subcode frames each (1 second at 1x speed)
, There are a maximum of 7,350.

The CD servo controller 21 constitutes a detecting means for detecting a C1 error.

The count value of the C1 error is stored in the memory 26.
Is transmitted to the computer 41 via the interface control unit 31 and is used for the inspection of the optical disk device 1 (determination of the reproduction capability or the recording / reproduction capability of the optical disk device 1).

In the CD servo controller 21, the CIR
The EFM signal after the C error correction is decoded (converted) into data of a predetermined format, that is, a DATA signal.

[0108] Typically, audio data (music data) is recorded on the optical disc 2 and its EFM
A case where a signal is decoded into a DATA signal in an audio format will be described.

FIG. 12 is a timing chart showing the audio format DATA signal, LRCLOCK signal, and BITCLOCK signal.

As shown in the figure, in the CD servo controller 21, the EFM signal is composed of 16-bit L channel data and 16-bit R channel data based on the clock signal from the clock 33.
Decoded to ATA signal.

In the CD servo controller 21,
BITC based on the clock signal from clock 33
A LOCK signal and an LRCLOCK signal are generated, respectively.

This BITCLOCK signal is a serial data transfer clock. The LRCLOCK signal is a signal for distinguishing L channel data and R channel data in the DATA signal. In this case, L
A high level (H) of the RCLOCK signal indicates L channel data, and a low level (L) indicates R channel data.

Even when ordinary data is recorded on the optical disk 2, the EFM signal is decoded into the above-mentioned DATA signal composed of 16-bit L-channel data and 16-bit R-channel data. .

The DATA signal, LRCLOCK signal and BITCLOCK signal are respectively
The data is input to the decoder control unit 28.

The CDROM decoder control unit 28 stores correction information, for example, ECC (Error Correc
If an error correction code of (Edtion Code) / EDC (Error Detecting Code) is recorded, the error correction is performed on the DATA signal.

This ECC / EDC is a CD-ROM M
This is an error correction code in the ODE1 format.
By this error correction, the bit error rate can be reduced to about 10 ⁻¹² .

In the CDROM decoder control unit 28, the DATA signal is decoded into data of a predetermined format for communication (transmission) based on the clock signal from the clock 35, and the decoded data (decoded data) is Is transmitted to the computer 41 via the interface control unit 31.

On the computer 41 side, for example, the decoded data is encoded, and the encoded data (encoded data) is recorded (copied) on a predetermined recording medium (for example, an optical disk).

Further, in the CD servo controller 21,
The FRAME SYNC signal shown in FIG. 13 is generated.

The level of the FRAME SYNC signal becomes a high level (H) when the HF signal is input to the CD servo controller 21 and the EFM signal is synchronized at a specified period (3T to 11T). And HF
When a signal (EFM signal) is not input (when synchronization is lost), FRAME S is output in EFM frame units.
The level of the YNC signal changes from a high level (H) to a low level (L).

The length (period) of one EFM frame
Is 136 μsec at 1 × speed, and 98 EFM frames are one subcode frame.

This FRAME SYNC signal is input to the control means 13 and used for detecting the end of the HF signal.

The SUBQ DATA signal is input from the CD servo controller 21 to the control means 13.

This SUBQ DATA signal is a signal indicating Q data of the subcode data.

The subcodes include P, Q, R, S, T,
There are eight types, U, V and W. One EFM frame has one byte of subcode, and one byte of each of the data P to W is recorded in one byte.

Each data of P to W is 1 bit, and one subcode frame is a 98 EFM frame. Therefore, each data of P to W in one subcode frame is 98 bits. However, the first 2EF
Since the M frame is used for a SYNC pattern (synchronization signal), the actual data is 96 bits.

FIG. 14 is a diagram showing a format of 96 bits of Q data. The controls (4 bits) of Q1 to Q4 shown in FIG. 6 are used for discriminating normal data / audio data.

Addresses Q5 to Q8 (4 bits)
Indicates the contents of data (72 bits) from Q9 to Q80.

The CRC (Cyclic R) of Q81 to Q96
The edundancy code (16 bits) is used for error (error) detection (determination of whether or not data is incorrect).

From the Q data, further, absolute time information on the optical disk 2, current track information, lead-in, lead-out, music number, and a table of contents called TOC (Table Of Contents) recorded in the lead-in. Contents and the like can be obtained.

The control means 13 obtains information from such Q data and performs predetermined control.

The SUBCODE-SYNC signal is input from the CD servo controller 21 to the control means 13.

As shown in FIG. 15, there are 98 bytes of subcode data in a 98 EFM frame. As described above, the two bytes of the first 2 EFM frames, ie, S0 and S1, have a SYNC pattern (synchronous signal ) Is recorded.

In the CD servo controller 21, this S
When the YNC pattern is detected, a pulse is generated and output. That is, one subcode frame (98EF)
For every M frames), a pulse is generated and output. The signal composed of this pulse is SUBCODE-SYN
This is the C signal. The SYNC pattern is detected 75 times per second at 1 × speed.

In the CD servo controller 21,
After detecting the pulse of the SUBCODE-SYNC signal, the above-described Q data is updated. Then, the updated Q data is read into the control means 13.

[Focus Control, Tracking Control, and Thread Control] The error signal generation circuit 18 performs addition or subtraction of the detection signal from the divided photodiodes described above, thereby
A focus error (FE) signal, a tracking error (TE) signal, and a thread error (SE) signal are respectively generated.

This focus error signal is a signal indicating the magnitude and direction of the shift of the objective lens from the focus position in the direction of the rotation axis (the shift amount of the objective lens from the focus position).

The tracking error signal is a signal indicating the magnitude of the displacement of the objective lens in the radial direction from the center of the track (pre-groove) and its direction (the amount of displacement of the objective lens from the center of the track).

The thread error signal is an error (error) signal used for thread control, that is, thread servo (feed servo of the optical head body of the optical head 3). In other words, it is a signal indicating the magnitude and direction of the displacement of the optical head 3 in the radial direction (the feed direction of the optical head 3) from the target position (proper position) of the optical head 3. The focus error signal is input to the CD servo controller 21.

The tracking error signal is input to the CD servo controller 21 and also to the peak / bottom detection circuit 17 as described above. The thread error signal is output from the CD servo controller 2
1 is input.

Using the focus error signal, tracking error signal and thread error signal, the optical disc device 1 performs focus control, tracking control and thread control on a predetermined track.

At the time of focus control, the CD servo controller 21 performs focus PWM (Puls Width Modulation) control for driving the actuator 4 in the rotation axis direction.
) A signal is generated. This focus PWM signal is
It is a digital signal (continuous pulse).

The focus PWM signal is input from the CD servo controller 21 to the PWM signal smoothing filter 7 and smoothed by the PWM signal smoothing filter 7, that is, converted into a control voltage (control signal).
Is input to Then, the driver 6 applies a focus signal (predetermined voltage) to the actuator 4 based on the control voltage, and drives the actuator 4 in the rotation axis direction (focus direction).

In this case, the CD servo controller 21
Is to adjust the pulse width (duty ratio) of the focus PWM signal and invert the sign (positive or negative) of the focus PWM signal so that the level of the focus error signal becomes 0 (as much as possible). I do. Thereby, the objective lens of the optical head 3 is located at the focus position.
That is, focus servo is applied.

In the tracking control, the CD servo controller 21 generates a tracking PWM signal for controlling the radial driving of the actuator 4.
This tracking PWM signal is a digital signal (continuous pulse).

The tracking PWM signal is input from the CD servo controller 21 to the PWM signal smoothing filter 7, and is smoothed by the PWM signal smoothing filter 7.
That is, it is converted into a control voltage (control signal) and input to the driver 6. The driver 6 applies a tracking signal (predetermined voltage) to the actuator 4 based on the control voltage, and drives the actuator 4 in the radial direction (tracking direction).

In this case, the CD servo controller 21
The tracking PWM is adjusted so that the level of the tracking error signal becomes zero (as much as possible).
The pulse width (duty ratio) of the signal is adjusted, and the sign (positive or negative) of the tracking PWM signal is inverted. Thereby, the objective lens of the optical head 3 is located at the center of the track (pre-groove). That is, tracking servo is applied.

At the time of thread control, the CD servo controller 21 generates a thread PWM signal for controlling the drive of the thread motor 5. This thread PW
The M signal is a digital signal (continuous pulse).

The sled PWM signal is input from the CD servo controller 21 to the PWM signal smoothing filter 7, smoothed by the PWM signal smoothing filter 7, that is, converted into a control voltage (control signal), and input to the driver 6. You. The driver 6 sends a sled signal (predetermined voltage) to the sled motor 5 based on the control voltage.
To drive the thread motor 5 to rotate.

In this case, the CD servo controller 21
Is to adjust the pulse width (duty ratio) of the thread PWM signal and to reverse the sign (positive / negative) of the thread PWM signal so that the level of the thread error signal becomes 0 (as much as possible). I do. Thereby, the optical head main body of the optical head 3 is located at the target position (appropriate position). That is, the thread servo is applied.

The tracking error signal is used in addition to tracking control, for example, for controlling the optical head (PU) 3 to move to a predetermined track (target track) of the optical disk 2 (track jump operation). .

[Rotation Speed Control (Rotation Speed Control)] The optical disc apparatus 1 controls the rotation speed of the spindle motor 8 at 1 × speed, such as 1 ×, 2 ×, 4 ×, 6 ×, 8 ×, and 12 × speed. Can be changed in multiple steps by an integer multiple of. This change is performed by setting the double speed switching mode.

For example, at the time of recording and reproduction, the rotation speed (rotation speed) of the spindle motor 8 is controlled in a state where the speed is set to a predetermined speed (in principle, 1 speed).

The method of controlling the number of rotations includes WOBBLE.
A method of controlling with a PWM (Puls Width Modulation) signal, that is, a spindle servo (WOBBLE servo) using a WOBBLE signal, and an FG
A method of controlling with a PWM signal, that is, a spindle servo (FG servo) using an FG signal, and an EFM PWM
There is a method of controlling with a signal, that is, a spindle servo (EFM servo) using an EFM signal. Hereinafter, these will be sequentially described.

The WOBBLE PWM signal is WOBBL
This is a spindle motor control signal generated by the E servo controller (microprocessor) 22. Specifically, it is a digital signal (continuous pulse) of 0-5V level.

This WOBBLE PWM signal is
The signal is input from the BLE servo controller 22 to the PWM signal smoothing filter 12, smoothed by the PWM signal smoothing filter 12, that is, converted into a control voltage (control signal), and input to the driver 11. And driver 1
1 drives the spindle motor 8 to rotate based on the control voltage.

In this case, the WOBBLE servo controller 22 sets the pulse width (duty ratio) of the WOBBLE PWM signal so that the frequency (period) of the WOBBLE signal becomes a target value (for example, 22.05 kHz at 1 × speed). Adjust). Thus, the spindle servo is operated so that the rotation speed (rotation speed) of the spindle motor 8 becomes a target value (hereinafter, referred to as “target rotation speed”).

The FG PWM signal is a spindle motor control signal generated by the control means 13. In particular,
It is a digital signal (continuous pulse) of 0-5V level.

The FG PWM signal is output from the I / O port 134 of the control means 13 and input to the PWM signal smoothing filter 12, and is smoothed by the PWM signal smoothing filter 12, that is, converted to a control voltage (control signal). The data is converted and input to the driver 11. And driver 1
1 drives the spindle motor 8 to rotate based on the control voltage.

On the other hand, the rotation speed of the spindle motor 8 is reduced by the motor rotation speed detection means to FG (Frequency Generator).
r) Detected as the frequency (period) of the signal. That is, the FG signal corresponding to the rotation speed (rotation speed) of the spindle motor 8 is output from the Hall element 9. This F
The G signal is binarized by the FG signal binarization circuit 23 into a square wave, and the frequency measurement unit (period measurement unit) of the control unit 13
132. Frequency measuring unit 13 of control means 13
2, based on the clock signal from the clock 32,
The frequency (period) of the FG signal is measured.

The control means 13 controls the FG PWM so that the frequency (period) of the FG signal becomes a target value.
Adjust the pulse width (duty ratio) of the signal. Thus, the spindle servo is operated so that the rotation speed (rotation speed) of the spindle motor 8 becomes the target rotation speed.

The frequency of the FG signal is
Is proportional to the number of revolutions. Therefore, for example, in the case of 6 × speed, 1
The frequency of the FG signal is six times that of the double speed.

The EFM PWM signal is a spindle motor control signal generated by the CD servo controller 21. Specifically, it is a digital signal (continuous pulse) of 0-5V level.

The EFM PWM signal is input from the CD servo controller 21 to the PWM signal smoothing filter 12, and is smoothed by the PWM signal smoothing filter 12.
That is, it is converted into a control voltage (control signal) and input to the driver 11. Then, the driver 11 drives the spindle motor 8 to rotate based on the control voltage.

In this case, the CD servo controller 21
Adjusts the pulse width (duty ratio) of the EFM PWM signal such that the period of a predetermined pulse of the EFM signal, that is, the pulse having a period of 3T to 11T, becomes a target value. Thus, the spindle servo is operated so that the rotation speed (rotation speed) of the spindle motor 8 becomes the target rotation speed.

In the above spindle servo,
The target number of revolutions of the spindle motor 8 differs between the inner circumference and the outer circumference of the optical disc 2 (the innermost circumference is 2.5 times the outermost circumference) in order to keep the linear velocity on the optical disc 2 constant. Therefore, in determining the target rotation speed, information on the radial position of the optical head 3 is considered together with information on what speed is currently set.

The information on the radial position of the optical head 3 is obtained from the absolute time on the optical disk. The absolute time is obtained from ATIP or SUB code Q data output from an ATIP decoder or a CD servo controller, and is input to the control means 13 to be grasped.

In the optical disk apparatus 1 described above, when data is written to a program area or the like of the optical disk 2, the above-described OPC is performed, and the output of the laser beam to be irradiated is set.

In this case, the number of times of test writing to the test area of the OPC (hereinafter referred to as “count number”) is not determined from only the recording of the count area (number of write frames), but is actually written in the test area. EF
By detecting the M signal, a portion to be written in the test area (a portion where test writing is to be performed this time: 1
(Which has a space for 5 ATIP frames) is unrecorded, and it is determined that all of the portions to be written are unrecorded, and then test writing is performed on the portion. Note that the portion to be written can be obtained by calculating the portion (absolute time on the optical disk) where writing is to start next from the count number in the count area.

If at least a part of the writing area in the test area has been recorded, the next area (a new writing area: a space for the next 15 ATIP frame adjacent to the inner circumference side of the disk) ) Is unrecorded, and it is determined that all of the portions to be written are unrecorded, and then test writing is performed on that portion. In this case, the count number (the number of write frames) in the count area is missing, so that the count area is corrected (repaired). That is, the number of frames to be written in the count area is increased in accordance with the number of updates of the portion to be written.

FIG. 18 is a flowchart showing the control operation of the OPC in the present invention. Hereinafter, the control operation of the OPC will be described in more detail with reference to FIGS.

First, initialization is performed (step 100).
In this initialization, the number N to be written to the count area this time is set to 0.
Settings are included.

Next, the optical head 3 is moved to search the count area, the count number recorded there is obtained (step 101), and the OPC mode is set (step 102).

Next, from the obtained count number, a portion to be written in the test area is detected, and the optical head (PU) 3 is moved there (step 103). For example, when the count number is 3, the portion to be written is the fourth partition (15 ATIP frames × 4) in the test area.

Next, the optical disk 2 is reproduced, and it is determined whether or not there is EFM data (step 104). That is, the PEEK signal and the BOTTOM signal of the envelope of the EFM data (random EFM signal) are detected by the peak / bottom detection circuit 17, the amplitude is obtained from the difference between the two, and the EFM data (HF signal) is written in the frame. Judge.

If the result of determination in step 104 is that EFM data is present, the count number is incorrect, so that the next write scheduled portion (in the above example, the fifth partition of the test area). Optical head (P
U) 3 is moved (step 105). Next, in step 115 described below, N is incremented by one (step 106) in order to correct the shortage count in the count area, and the process returns to step 104.

If the result of determination in step 104 is that there is no EFM data, it is determined whether the end time at the write scheduled portion has passed, that is, EAT data for 15 ATIP frames.
It is determined whether or not FM data has been searched (step 10).
7) Until the end time has passed, the determination in step 104 is performed.

When the end time has passed, that is, when there is no EFM data at the latest planned write position, the optical head (PU) 3 is moved to the write start time (write start position) at the planned write position. (Step 108), writing is started (Step 1)
09). As a result, test writing is performed on the portion to be written with the laser light having 15 levels of output.

It is determined whether or not the writing has been completed at the expected write location (step 110). When the write has been completed, the optical head (P) is re-started at the write start time (write start position) at the expected write location.
U) 3 is moved (step 111), and E
Read FM data (random EFM signal).

Next, the β values (15 types) are obtained from the test-written EFM data (step 112).
The optimum laser output is calculated and obtained from these β values (step 113).

Next, this optimum laser output value is set in a D / A converter built in the control means 13 (step 1).
14) With this laser output, write the count area N + 1 times (for N + 1 ATIP frames) (step 11).
5). Thereby, the count number of the count area is corrected to an appropriate number.

As described above with reference to FIGS. 17 and 18, according to the optical disc apparatus 1 of the present invention, the number of OPC counts is determined not from the count area recording alone but from the test area writing. Since it is detected whether or not the EFM signal is actually recorded in the scheduled portion, it is determined that all of the writing-scheduled portions have not been recorded, and then test writing is performed in that portion. Regardless, double writing (overwriting) on the test area can be prevented.

If the count number in the count area is incorrect, it is corrected, so that there is no error from the next time, the OPC can be performed quickly, and the optical disk can be used without waste. it can.

The optical disk device of the present invention is the same as the above-described CD.
-R drive device, other than this, for example, CD-R
The present invention can be applied to various optical disk devices that record and reproduce various optical disks such as W, DVD-R, and DVD-RAM, and optical disks dedicated to recording on these optical disks.

The optical disk apparatus and the test writing method according to the present invention have been described based on the illustrated embodiment. However, the present invention is not limited to this. Can be substituted or omitted.

[0186]

As described above, according to the present invention, double writing (overwriting) can be prevented beforehand when test writing is performed in the test area. Output setting (OPC) becomes possible.

When the count area is corrected, the optical disk can be used without waste.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a state where an optical disk device of the present invention is connected to a computer.

FIG. 2 is a block diagram showing an embodiment of the optical disk device of the present invention.

FIG. 3 is a timing chart showing an ENCODE EFM signal from an EFM / CDROM encoder control unit and an ENCODE EFM signal from a laser control unit according to the present invention.

FIG. 4 shows an ATIP-SYNC signal according to the present invention and SUBCODE from a sync signal generation / ATIP decoder;
6 is a timing chart showing a -SYNC signal and an ATIP ERROR signal.

FIG. 5 shows an ATIP-SYNC signal according to the present invention and a SUBCODE from a sync signal generation / ATIP decoder.
-SYNC signal and SU from CD servo controller
6 is a timing chart showing a BCODE-SYNC signal.

FIG. 6 shows 1T Biphase ATI according to the present invention.
P timing, WOBBLE signal, WO after binarization
6 is a timing chart showing a BLE signal.

FIG. 7 shows a BIDATA signal and BICL according to the present invention.
5 is a timing chart showing an OCK signal and an ATIP-SYNC signal.

FIG. 8 is a diagram showing a format of an ATIP frame according to the present invention.

FIG. 9 shows an ATIP-SYNC signal and S
6 is a timing chart showing a UBCODE-SYNC signal.

FIG. 10 shows an input signal to a peak / bottom detection circuit according to the present invention, the amplitude (envelope) of the input signal,
6 is a timing chart showing a PEEK signal and a BOTTOM signal.

FIG. 11 is a timing chart showing a SUBCODE-SYNC signal and a C1ERROR signal from a CD servo controller according to the present invention.

FIG. 12 is a timing chart showing a DATA signal, an LRCLOCK signal, and a BITCLOCK signal in an audio format according to the present invention.

FIG. 13 shows a SUBCODE-SYNC signal from a CD servo controller and FRAME SY in the present invention.
6 is a timing chart showing an NC signal and an HF signal (EFM signal).

FIG. 14 is a diagram showing a format of 96 bits of Q data according to the present invention.

FIG. 15 is a diagram showing one subcode frame in the present invention.

FIG. 16 is a diagram showing an information recording area of an optical disc (CD-R) according to the present invention.

FIG. 17 shows O of the optical disc (CD-R) according to the present invention.
FIG. 3 is a diagram illustrating a PCA and the like necessary for a PC.

FIG. 18 is a flowchart illustrating an OPC control operation according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 optical disk device 10 casing 2 optical disk 3 optical head (optical pickup) 4 actuator 5 thread motor 6 driver 7 PWM signal smoothing filter 8 spindle motor 9 Hall element 11 driver 12 PWM signal smoothing filter 13 control means 131 counter 132 frequency measuring unit (period) Measurement unit) 14 Laser control unit 15 HF signal generation circuit 16 HF signal gain switching circuit 17 Peak / bottom detection circuit 18 Error signal generation circuit 19 WOBBLE signal detection circuit 21 CD servo controller 22 WOBBLE servo controller 23 FG signal binarization circuit 24 EFM / CDROM encoder controller 25, 26 memory 27 sync signal generation / ATIP decoder 28 CDROM decoder controller 29 memory 3 DESCRIPTION OF SYMBOLS 1 Interface control part 32-35 clock 36 address data bus 41 computer 42 keyboard 43 mouse 44 monitor (CRT) 51,52 pulse 100-115 steps

Claims (7)

[Claims] 1. An optical disk apparatus for recording or recording / reproducing an optical disk having a test area for performing test writing, comprising: a motor for driving an optical disk to rotate; a motor movable at least in a radial direction of the optical disk; An optical head that can write information by irradiating light, and a control unit that controls the operation of the optical head. When performing test writing to determine the output of the laser light, An optical disc device characterized in that it is configured to detect whether a portion to be written has been recorded or not, and to carry out test writing only to an unrecorded portion. 2. An optical disc apparatus for recording, recording, or reproducing data on or from an optical disc having a test area for performing test writing and a count area for recording the number of times test writing has been performed on the test area, wherein the optical disc is rotationally driven. A motor, an optical head movable at least in a radial direction of the optical disc, and capable of irradiating the optical disc with laser light to write information, and a control unit for controlling operation of the optical head, When performing test writing to determine the output of the test area, it is detected whether or not the planned write area of the test area detected based on the recording of the count area is already recorded, and writing is performed only on the unrecorded area. An optical disk device characterized by having such a configuration. 3. The optical disk device according to claim 2, wherein the optical disk device has a function of correcting an error in recording of the count area. 4. A method for performing test writing on the test area of an optical disc having a test area for performing test writing, wherein it is detected whether or not a portion to be written in the test area has been recorded, A trial writing method characterized in that only writing is performed. 5. A method for performing test writing on the test area of an optical disc having a test area for performing test writing and a count area for recording the number of times test writing has been performed on the test area, wherein the recording of the count area is performed. A test writing method characterized in that a write scheduled portion of the test area is detected based on the following, then whether the planned write portion is recorded is detected, and writing is performed only on an unrecorded portion. . 6. The test writing method according to claim 5, wherein when the recording of the count area is incorrect, the error is corrected. 7. The test writing is performed to determine an output of a laser beam at the time of recording on an optical disk.
7. The test writing method according to any one of Items 1 to 6.