JPH11162112A - Optical disk device and method for detecting end of data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device and a method for detecting the end of data which enable detection of the end of data recorded on an optical disk in a short period of time. SOLUTION: An optical disk device 1 is a CD-R drive unit for recording and reproducing data onto and from an optical disk (CD-R) 2. In this optical disk device 1, tracks between a detection start position and a detection end position on the optical disk 2 is equally divided into 10, and an optical head 3 is moved to detect the recorded/unrecorded state of data at division points sequentially from the detection start position. It is specified that the end of the data recorded on the optical disk 2 exists in a division area between a division point which is read as being unrecorded and a division point which is adjacent to the former division point and read as being recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical disk apparatus for recording / reproducing an optical disk and a method for detecting the end of data.

[0002]

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

In the optical disk device, when data is recorded on the optical disk, the tracking servo may be disengaged due to, for example, vibration or the operation may be difficult to continue, and the recording may be stopped. In such a case, since the end of the data (EFM data) recorded on the optical disk cannot be specified, the end of the data is detected (searched).

[0004] However, the conventional optical disk apparatus has a drawback that a lot of useless operations are performed and it takes a long time to detect the end of data recorded on the optical disk.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disk apparatus and a data end detection method capable of detecting the end of data recorded on an optical disk in a short time.

[0006]

This and other objects are achieved by the present invention which is defined below as (1) to (5).

(1) A rotation drive mechanism for mounting and rotating an optical disk, an optical head, signal processing means for processing a signal read from the optical disk by the optical head, and at least the rotation drive mechanism, an optical head, and a signal An optical disc device for recording / reproducing the optical disc, wherein the number of tracks between a detection start position and a detection end position on the optical disc is divided into three or more, Moving the optical head to sequentially detect recording / unrecording of data at the division point from the detection start position, and a division point read as unrecorded;
An optical disc device, comprising: an end detecting means for specifying that the end of data recorded on the optical disc is located in a divided area between a recording point adjacent to the dividing point and a read dividing point.

(2) The end detecting means sets the division point read as unrecorded as one of the detection start position and the detection end position, and sets the division point read as recorded as the detection start position and the detection end position. The optical disk device according to (1), wherein the operation is repeated until the interval between the divided areas becomes smaller than a predetermined value as the other of the positions.

(3) When the interval between the divided areas becomes smaller than a predetermined value, the end detecting means continuously detects recording / non-recording of data in the divided areas and records the data on the optical disk. The optical disc device according to the above (2), which is configured to identify the end of the data.

(4) There is provided a counting means for counting the number of tracks which the optical head passes, and the position of the optical head with respect to the optical disk is grasped based on the count value of the counting means, and the optical head is moved to a target track. The optical disk device according to any one of the above (1) to (3), wherein

(5) The number of tracks between the detection start position and the detection end position on the optical disk is divided into three or more, and data recording / non-recording at the division points is sequentially detected from the detection start position, and the unrecorded data is detected. A data division method comprising: specifying that a read division point and a division area between a record adjacent to the division point and a read division point have an end of data recorded on the optical disc. Termination detection method.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk device and a data end detection method according to the present invention will be described in detail with reference to the 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 disc 2.

The pre-groove meanders at a predetermined period (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 disc 2 (pit / land recording). Also, this pre-groove is played,
It is used for controlling the rotation speed of the optical disk 2 and specifying the position (absolute time) on the optical disk 2.

The optical disk device 1 includes a turntable and a spindle motor 8 for rotating the turntable.
It has a rotation drive mechanism (not shown) for mounting the optical disk 2 on the turntable and rotating it. A Hall element 9 is installed near the spindle motor 8.

The optical disk apparatus 1 has an optical head (optical pickup) 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), and An optical head main body moving mechanism (not shown) including a sled motor 5 for moving the head 3 in the radial direction, that is, an optical head main body (optical pickup base) to be described later of the optical head 3 in the radial direction, and drivers 6 and 11 And PWM
Signal smoothing filters 7 and 12, control means 13,
A laser control unit 14, an HF signal generation circuit 15, an HF signal gain switching circuit 16, a peak / bottom detection circuit 17, an error signal generation circuit 18, a WOBBLE signal detection circuit 19, a CD servo controller 21, a WO
BBLE servo controller 22, FG signal binarization circuit 23, EFM / CDROM encoder control unit 24
, Memories 25, 26 and 29, a sync signal generation / ATIP decoder 27, a CDROM decoder control unit 28, an interface control unit 31, a clock 3
2, 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) having a laser diode (light source) and a split photodiode (light receiving element),
An objective lens (condensing lens). The driving of the laser diode is controlled by the laser controller 14.

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 main body.

The control means 13 is usually constituted by a microcomputer (CPU), and comprises an optical head 3 (actuator 4), a sled motor 5, a spindle motor 8, a laser control section 14, an HF signal gain switching circuit 16, a peak / bottom section. Detection circuit 17, CD servo controller 2
1, WOBBLE servo controller 22, EFM / C
DROM encoder control unit 24, memories 25 and 26,
29, sync signal generation / ATIP decoder 27, CDR
OM decoder control unit 28, interface control unit 31
For example, the entire optical disk device 1 is controlled. The control means 13 controls the data (E) recorded on the optical disc 2.
The main function of the end detecting means for detecting the end of the FM data is achieved.

The address, data, and COMMAN are sent from the control means 13 via an 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.

As the interface control unit 31, for example, an ATAPI (IDE) (Attape standard) such as SFF8080, or a SCSI (Scudgery standard) such as MMC is used.

The computer 41 has a keyboard 4
2. The mouse 43 and the monitor 44 are connected respectively. Note that a transmission unit is configured by the interface control unit 31.

The HF signal generation circuit 15, the HF signal gain switching circuit 16, the peak / bottom detection circuit 17,
Error signal generation circuit 18, WOBBLE signal detection circuit 1
9. The signal processing means is constituted by the CD servo controller 21 and the WOBBLE servo controller 22.

The CD servo controller 21 constitutes signal generating means for generating a signal whose level changes in EFM frame units in accordance with recording / non-recording of data on the optical disk 2.

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, that is, information indicating the control (for example, each status 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 based on the clock signal from the clock 34 (at the timing of the clock signal), 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 this 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 output from the EF
The data is input from the M / CDROM encoder control unit 24 to the laser control unit 14.

Further, 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 unit 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 disc 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 output from the OPC (Opti
mum Power Control) is used for laser output adjustment (power control) at the time of test writing to the test area.

At the time of test writing in the test area in the OPC, the random EFM signal is output from the EFM / CDRO
The data is input from the M encoder control unit 24 to the laser control unit 14.

At the time of test writing in the test area in the OPC, the control means 13 generates a WRITE POWER signal having 15 levels and outputs the WRITE POWER signal.
The EPOWER 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, the laser control unit 14 receives the WRIT from the control unit 13 based on the random EFM signal.
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 the OPC operation, the test writing to the test area is performed with the laser light having the 15-step output in this manner.

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 split photodiode outputs a WOBBLE signal shown in FIG. 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 this ATIP information error detection, 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.

The 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 to substantially match the position of the SUBCODE-SYNC signal in the EFM data generated at the time of writing 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.

Each light receiving portion of the divided photodiode outputs a current (voltage) corresponding to the amount of received light, and these currents, ie, each signal (detection signal)
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 the 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.

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

The PEEK signal and the 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 are used, for example, for amplitude measurement, amplitude adjustment of a tracking error signal, and β in OPC (Optimum Power Control).
It is used for calculating (β value), determining the presence or absence of an HF signal, and the like.

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 this 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.

A case where the first CIRC correction cannot be performed in the C1 error correction is referred to as “C1 error”, and a case where the second CIRC correction cannot be performed in the C2 error correction is referred to as the “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.

[0100] 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.

The 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 disc 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 section 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 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).

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.

The 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 one 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 the 98 EFM frame. As described above, the two bytes of the first 2 EFM frames, ie, S0 and S1, have a SYNC pattern (synchronization 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 sled control] The error signal generation circuit 18 performs addition and subtraction of the detection signals from the divided photodiodes described above, thereby obtaining
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.

The optical disc device 1 performs focus control, tracking control and sled control on a predetermined track by using these focus error signal, tracking error signal and sled error signal.

At the time of the focus control, the CD servo controller 21 controls the focus PWM (Puls Width Modulation) for controlling the driving of 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 is 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 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 thread 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.

In addition to the tracking control, the tracking error signal is generated by, for example, moving the optical head 3 to the optical disk 2.
This is also used for control (track jump operation) when moving to a predetermined track (target track).

[Rotation Number Control (Rotation Speed Control)] In the optical disk device 1, for example, during recording and reproduction,
The rotation speed (rotation speed) of the spindle motor 8 is controlled. The method of controlling the number of rotations includes WOBBLEPWM
(Puls Width Modulation) signal, that is, a spindle servo (W) using a WOBBLE signal.
OBBLE servo) and a method of controlling with an FG PWM signal, that is, a spindle servo (F
G servo) and a method of controlling with an EFM PWM signal, that is, a spindle servo (EFM) using an EFM signal
Servo). 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 22. Specifically, it is a digital signal (continuous pulse) of 0-5V level.

The WOBBLE PWM signal is the WOBBLE signal.
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 the target value.

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.

This FG PWM signal is input from the control means 13 to the PWM signal smoothing filter 12,
The signal is smoothed by an M signal smoothing filter 12, that 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.

On the other hand, from the Hall element 9, an FG (Frequenc) corresponding to the rotation speed (rotation speed) of the spindle motor 8 is obtained.
y Generator) signal is output. This FG signal is
The signal is binarized by a G signal binarization circuit 23 and input to a frequency measurement unit (period measurement unit) (not shown) of the control unit 13.

The frequency measuring section of the control means 13 measures the frequency (period) of the FG signal based on the clock signal from the clock 32. Then, the control means 13
The pulse width (duty ratio) of the FG PWM signal is adjusted so that the frequency (cycle) of the G signal 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 value.

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 value.

The optical disk device 1 is configured to detect the end of data (EFM data) recorded on the optical disk 2. Hereinafter, detection (search) of the end of data recorded on the optical disc 2 will be described.

Data recording on the optical disk 2 is performed from the inner circumference to the outer circumference. When the recording of data on the optical disk 2 is terminated or stopped in accordance with a command or a program from the computer 41, FIG.
As shown in (a), data is normally recorded up to the 26th EFM frame. In this case, the time information (position information on the optical disk 2) indicating the end of the data recorded on the optical disk 2 is stored in the PMA (Program Memory) of the optical disk 2.
Area: recorded in an area called a program memory area (in which the start and end times of a track are written). For this reason, the end of the data recorded on the optical disc 2 can be specified from the time information recorded on the PMA.

On the other hand, during the recording of data on the optical disc 2, the tracking servo is lost due to, for example, vibration, or the operation becomes difficult to continue, and the recording is stopped (hereinafter, “recording is stopped due to trouble”). ), The end of the data recorded on the optical disc 2 is
It depends on the position of the optical head 3 with respect to the optical disk 2 when the recording is stopped. In such a case, as shown in FIG. 16B, the end of the data recorded on the optical disk 2 is the end of the data previously recorded (the second end).
6 EFM frames), the next EFM frame:
It can be seen that it is from the 27th EFM frame to the last EFM frame where data recording on the optical disc 2 is possible.

Therefore, in the present embodiment, if the recording is stopped due to a trouble in the second and subsequent recordings, FIG.
As shown in FIG. 6 (b), the detection start time (detection start position) of the end of the data is set to the EFM frame next to the end of the previously recorded data (the 26th EFM frame), that is, the 27th EFM frame. When the recording is stopped due to a trouble in the recording, the detection start time (detection start position) of the end of the data is set to the first position where the data can be recorded on the unrecorded optical disk 2 (the innermost side where data can be recorded. ) Is an EFM frame.

Further, the detection end time (detection end position) of the end of the data is set to the last recordable data on the unrecorded optical disk 2 (the outermost periphery where data can be recorded).
EFM frame.

As described above, the time information indicating the end (26th EFM frame) of the data previously recorded on the optical disk 2 is stored in the PMA of the optical disk 2, so the control means 13 determines the data based on the time information. Of the end of the detection can be grasped.

The control means 13 grasps the first EFM frame on which data can be recorded on the unrecorded optical disc 2 and the last EFM frame on which data can be recorded on the unrecorded optical disc 2, respectively. I have.

FIG. 17 and FIG.
FIG. 6 is a diagram for explaining detection of the end of data recorded on the optical disc 2 in FIG. 17 and 18, the left side is the inner side of the optical disk 2, and the right side is the outer side of the optical disk 2.

As shown in FIG. 17A, the optical disk 2
When detecting the end of the data recorded in the
The number of tracks N between two points of the detection start time and the detection end time is obtained, and the number N of tracks is equally divided into m (m is an integer of 3 or more). That is, S = N / m is obtained.

The value of m is preferably 4 or more, more preferably 8 to 20, and still more preferably 8 to 10.

In this embodiment, the number of tracks N is equally divided into ten. That is, S = N / 10 is determined.

Next, a track jump (track jump control) is performed to move the optical head 3 S tracks in the outer circumferential direction from the detection start time. Then, EFM data is detected at this position (track), that is, at the division point (recording / unrecording of data is detected).

When EFM data is detected, the end of the data is on the outer peripheral side of this position (track).
When EFM data is not detected, the end of the data is between this position (track) and a position (track) on the inner circumference side of the S track from this position (divided area).

Therefore, when the EFM data is detected, the track jump is performed again, the optical head 3 is moved S tracks in the outer circumferential direction, and the EFM data is detected at this position, that is, at the division point. This is repeated until no EFM data is detected or until the number of track jumps reaches nine.

If no EFM data is detected, as described above, the end of the data is set at this position,
Since it is located between this position and the position on the inner circumferential side of the S track (divided area), the number of tracks between them is equally divided into ten.

More specifically, when no EFM data is detected, as shown in FIG.
The time information (A) is acquired, and thereafter, a track jump is performed, the optical head 3 is moved S tracks in the inner circumferential direction, and the ATIP time information (B) is acquired at this position.

Then, the difference (AB) between the time A before the track jump and the current time B is calculated, and the number of tracks N ₂ between the time A and the time B is calculated as shown in FIG. The number N ₂ is set as the number of tracks N, and the number N of tracks is equally divided into ten. That is, S = N / 10 is determined.
As shown in FIG. 17, the current time (B) is set as the detection start time, and the time (A) before the track jump is set as the detection end time.

Also, as shown in FIG. 18A, track jump is performed nine times, and when EFM data is detected at this position, the end of the data is determined by the current time and the detection end time. between.

Accordingly, the track jump is performed nine times, and when EFM data is detected at this position, the ATIP time information is obtained at this position, and as shown in FIG. , The number of tracks N ₁ during this time is obtained, and this N ₁ is set as the number of tracks N.
Is equally divided into ten. That is, S = N / 10 is determined. Also, as shown in FIG. 18, the current time is set as the detection start time.

As shown in FIGS. 17 (b) and 18 (b), in each case, a track jump is performed, and the optical head 3 is moved S tracks in the outer circumferential direction from the detection start time. Then, EFM data is detected at this position.

When the EFM data is detected, the track jump is performed again, the optical head 3 is moved S tracks in the outer circumferential direction, and the EFM data is detected at this position. This is done until EFM data is no longer detected.
Alternatively, the operation is repeated until the number of track jumps reaches nine.

The subsequent operation when the EFM data is no longer detected and the track jump performed nine times and the subsequent operation when the EFM data is detected at this position are as follows.
Each is as described above.

The above operation is repeated until the time interval between time A and time B (interval between divided areas), that is, the number of subcode frames F between time A and time B becomes smaller than a predetermined value. In this case, in the present embodiment, the above operation is
The number of subcode frames F between time A and time B is 150
Repeat until less than.

The number F of sub-code frames is 1
When the value becomes less than 50, the reproduction mode is set as described later, and EFM data is continuously detected from time B to time A (continuously detecting data recording / non-recording). In this case, the EFM data is not detected at a predetermined time, but the end of the EFM data is within the subcode frame at the time when the EFM data is not detected.

In this way, the end of the EFM data is detected for each subcode frame, and thereafter, the end of the data is detected for each EFM frame, as described later.

Next, the control operation of the control means 13 when detecting the end of the data recorded on the optical disk 2 in the optical disk device 1 will be described.

FIGS. 19 and 20 show control means 13 for detecting the end of data recorded on optical disc 2.
5 is a flowchart showing the control operation of the first embodiment. Hereinafter, description will be made based on these flowcharts.

When a data end detection command is received from the computer 41, these programs (data end detection routine, data end detection routine for each EFM frame) are executed.

First, initialization is performed (step S10)
1). In this step S101, for example, the memory 2
The initialization of the predetermined address 6 (the area where the time C described later is stored) is performed.

Next, the mode is set to the end-of-data detection mode (step S102). Next, at the detection start time, EF
It is determined whether there is M data and there is no EFM data at the detection end time (step S103).

In step S103, the PEEK of the HF signal from the peak / bottom detection circuit 17 shown in FIG.
If the level of the signal BOTTOM exceeds a predetermined threshold, it is determined that EFM data is present,
When the levels of the EEK signal and the BOTTOM signal are lower than the threshold value, it is determined that there is no EFM data.

If it is determined in step S103 that there is no EFM data at the detection start time, for example, FIG.
As shown in (a), when the EFM data has been recorded up to the 26th EFM frame, or when it is determined that the EFM data exists at the detection end time, this program is ended.

In step S103, when it is determined that the EFM data is present at the detection start time and the EFM data is not present at the detection end time, that is, the end of the EFM data is between the detection start time and the detection end time. In this case, the number of tracks N in the radial direction from the detection start time to the detection end time is calculated (step S104).

In step S104, the difference between the radius at the detection start time and the radius at the detection end time is obtained, and this difference is divided by the track pitch (1.6 μm).

Next, the movement of the optical head 3 to the detection start time is started, and it is determined whether or not the optical head 3 has moved to the detection start time (step S105), and the optical head 3 has moved to the detection start time. Is determined, the number of tracks N is equally divided into ten. That is, S = N / 10 is obtained (step S106).

Next, S track and track jump are performed in the outer peripheral direction (step S107). That is, the optical head 3 is moved S tracks in the outer circumferential direction from the detection start time.

More specifically, the CD servo controller 21
Controls the driving of the actuator 4 so that the optical head 3
Is moved to the target track, and the drive of the thread motor 5 is controlled so that the optical head body of the optical head 3 follows the objective lens. In this case, the CD servo controller 21 counts the number of tracks through which the optical head 3 (objective lens) passes by a counter (coefficient unit) 211 using a tracking error signal, and, based on the counted value, the number of tracks on the optical disc 2. The position of the head 3 (objective lens) is grasped. As described above, in the track jump, by controlling the driving (movement) of the objective lens, the optical head 3 can be relatively accurately moved to the target track.

Next, as described above, it is determined whether or not there is EFM data (step S108).

If it is determined in step S108 that there is EFM data, it is determined whether the number of track jumps is nine (step S109).

If it is determined in step S109 that the number of track jumps is eight or less, step S109 is executed.
The process returns to step S107, and step S107 and subsequent steps are executed again.

If it is determined in step S109 that the number of track jumps is nine, the ATI
P time information is obtained (step S110).

Next, the number of tracks N ₁ from the current time to the detection end time is calculated, N = N ₁ , and the current time is set as the detection start time (step S 111).

After step S111, step S106
And the steps from step S106 are executed again.

In step S108, the EFM
If it is determined that there is no data, ATIP time information (A) is obtained (step S112).

Next, an S track and a track jump are performed in the inner circumferential direction (step S113). That is, the optical head 3 is moved S tracks from time A in the inner circumferential direction.

Next, ATIP time information (B) is obtained (step S114). Next, the difference (AB) between the time A and the time B is calculated, and this (AB) is converted into the number of subcode frames (the number of ATIP frames) F (step S115).

Next, it is determined whether or not F <150 (step S116). Since the minimum number of subcode frames when data is recorded on the optical disc 2 is usually 150, in this embodiment, in this step S116,
Remaining number of subcode frames, that is, time A and time B
It is determined whether or not the number F of sub-code frames is less than 150. In the case of 1 × speed, 150 subcode frames are 2 seconds.

When it is determined in step S116 that F ≧ 150, the number of tracks N ₂ from the current time (B) to the time (A) before the track jump is calculated, and N is calculated.
= And N _2, the current time (B) a detection start time, track jump before the time the (A) and the detection end time (step S117).

After step S117, step S106
And the steps from step S106 are executed again.

In step S116, F <1
If it is determined to be 50, the playback mode is set and the time B
To F subcode frame, ie, time B to time A
Up to this point, the end of the EFM data is detected for each subcode frame (1 ATIP frame) (step S11).
8).

In step S118, as described above, H from the peak / bottom detection circuit 17 shown in FIG.
The PEEK signal and the BOTTOM signal of the F signal are detected for each subcode frame from the time B, and the PEEK signal and the BOTTOM signal are detected.
The level of the BOTTOM signal is compared with a threshold.

Next, it is determined whether or not there is EFM data for each subcode frame from time B as described above (step S119). If it is determined that there is no EFM data, ATIP time information (C ) And get the time C
Is stored in a predetermined address of the memory 26 (step S120).

As a result, the subcode frame (ATI
The end of the EFM data is detected in units of (P frame). That is, the sub-code frame (A
It is found that the end of the EFM data exists in the (TIP frame). This ends the program.

Next, a data end detection routine for each EFM frame shown in FIG. 20 is executed. in this case,
In the subcode frame (ATIP frame) at the time C, the end of the EFM data is detected.

First, initialization is performed (step S20).
1). In this step S201, for example, the memory 2
6 is initialized (an area where the number of EFM frames x described later is stored).

Next, the mode is set to the end-of-data detection mode for each EFM frame (step S202).

Next, a timer (timer function) 132
Is initialized (step S203).

Next, the SUBCODE-SYNC signal from the sync signal generation / ATIP decoder 27 and the ATIP-SYNC signal from the sync signal generation / ATIP decoder 27
Synchronize with the NC signal (step S204).

In step S204, a synchronization command is issued as shown in FIG. Thereby, in the sync signal generation / ATIP decoder 27,
SUBCODE-SYNC signal and ATIP-SYNC
Synchronization with the signal is performed, and the subsequent SUBCODE-
The SYNC signal and the ATIP-SYNC signal are synchronized.

Next, the time C is read from a predetermined address of the memory 26 to specify the subcode frame in which the end of the EFM data is detected, and the subcode frame immediately before (the inner peripheral side) from this subcode frame is specified. The optical head 3 is moved to the frame. Then, it is determined whether or not the optical head 3 has moved to a subcode frame immediately before the subcode frame in which the end of the EFM data is detected (step S205). In step S205, it is determined whether or not the optical head 3 has moved to the immediately preceding subcode frame based on the ATIP time information.

If it is determined in step S205 that the optical head 3 has moved to a subcode frame immediately before the subcode frame in which the end of the EFM data is detected, the sync signal generation / ATIP decoder 27
It is determined whether or not the SUBCODE-SYNC signal from the SUBCODE is detected (step S206).
If it is determined that the −SYNC signal has been detected, the timer 132 is started (started) (step S20).
7).

In this step S207, the timer 132 is started at the fall of the pulse. Timer 1
Reference numeral 32 is configured to count 1 in 2 μsec.

Next, it is determined whether or not the level of the FRAME SYNC signal is high (H) (step S2).
08).

As described above, the prescribed period (3T to 11
T) when the EFM signals are synchronized, that is, EFM
When there is data, the level of the FRAME SYNC signal becomes high level (H), and when there is no EFM data, the level of the FRAME SYNC signal becomes low level (L) (see FIGS. 13 and 21). . This FRAM
The level of the ESYNC signal is switched in EFM frame units.

At step S208, FRAME
If the level of the SYNC signal is determined to be high (H), it is determined whether or not the SUBCODE-SYNC signal from the sync signal generation / ATIP decoder 27 has been detected (step S209).

In step S209, SUBCOD
If it is determined that no E-SYNC signal is detected,
The procedure returns to step S208, and the steps after step S208 are executed again.

Also, in step S209, SUB
If it is determined that the CODE-SYNC signal has been detected, this subcode frame has no end of the EFM data, and that fact is stored at a predetermined address in the memory 26 (step S210).

In step S208, FRA
When it is determined that the level of the ME SYNC signal is low (L), the timer 132 is stopped (stopped) (step S211).

Next, a time t is calculated from the count number of the timer 132 (step S212).

As described above, the level of the FRAME SYNC signal is switched in units of EFM frames (in the case of 1 × speed, 1 EFM frame = 136 μsec), and the timer 132 counts 1 every 2 μsec. It is an integral multiple of 68.

Next, the time t is converted into the number of EFM frames x (step S213). Thus, it is found that the x-th EFM frame of the subcode frame at the time C, that is, the x-th EFM frame has the end of the EFM data.

Next, the number x of EFM frames is stored in the memory 2
6 is stored at a predetermined address (step S214).

Step S214 or step S2
After 10, the program ends.

The number x of EFM frames stored in the memory 26 is used, for example, for repairing the optical disk 2, that is, for repair (auto repair).

In this repair, no gap (unrecorded portion) is formed between the xEFM frame and the xEFM frame.
Overwrite is up to 12 EFM frames,
Recording is performed on the optical disc 2 so that the end of the EFM data is the 26th EFM frame (see FIG. 16A). By this repair, additional writing on the optical disk 2 can be performed reliably.

As described above, according to the optical disk device 1 (the method of detecting the end of data), the end of the data recorded on the optical disk 2 can be detected in EFM frame units.

When recording is stopped due to a trouble (when recording on the optical disk 2 fails), the end of data can be detected in EFM frame units, so that repair can be performed reliably. This allows
Additional writing on the optical disk 2 can be performed reliably.

In an optical disk device conforming to the above-mentioned ATAPI (attapee standard) and SCSI (scuzzy standard), a repair function for the optical disk 2, that is, a repair (auto repair) function is essential. According to the device 1, since the end of data can be detected in EFM frame units, a repair function can be provided easily and reliably.

According to the optical disk device 1, the ATI
Jump track without reading P time information,
Since the optical head 2 is moved to the target track, the ATI
A waiting time for synchronization for reading the P time information is not required, and the number N of tracks between the detection start time and the detection end time is equally divided into 10 to detect the end of data. The end of data can be detected in a short time.

In the operation system which is the basic software of the computer 41, if the response of the peripheral device is slow,
In some cases, the peripheral device is reset by the operation system and interrupts the operation, or the response from the peripheral device cannot be recognized. However, according to the optical disk device 1, the end of data can be detected in a short time. For example, when a command for detecting the end of data is received from the computer 41, a response to the computer 41 can be made quickly, and the above-described problem can be solved.

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 for recording / reproducing an optical disk having a pre-groove such as W, DVD-R, and DVD-RAM.

The present invention can also be applied to the case where the end of the data is detected when the recording is stopped due to a trouble during the recording of the data on the PMA of the optical disk.

The present invention can also be applied to the case where the end of packet writing is detected.

As described above, the optical disk apparatus and the method of detecting the end of data of the present invention have been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each unit has the same function. It can be replaced by any configuration having

For example, in the present invention, the detection start time (detection start position) for detecting the end of data recorded on an optical disk is the first time at which data can be recorded on an unrecorded optical disk (data recording is It may be configured to be the EFM frame (the innermost possible side).

[0240]

As described above, according to the optical disc apparatus and the data end detecting method of the present invention, the end of the data recorded on the optical disc can be detected in a short time.

[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 schematically showing an EFM frame of data recorded on an optical disc in the present invention.

FIG. 17 is a diagram for explaining detection of the end of data recorded on an optical disc in the present invention.

FIG. 18 is a diagram for explaining detection of the end of data recorded on an optical disc according to the present invention.

FIG. 19 is a flowchart showing the control operation of the control means when detecting the end of data recorded on the optical disc in the present invention.

FIG. 20 is a flowchart showing the control operation of the control means when detecting the end of data recorded on the optical disc in the present invention.

FIG. 21 shows an ATIP-SYNC signal according to the present invention;
Sync signal generation / SUBCOD from ATIP decoder
E-SYNC signal, EFM signal, FRAME SY
6 is a timing chart showing an NC signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk drive 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 Timer 14 Laser control unit Reference Signs List 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 211 Counter 22 WOBABLE servo controller 23 FG signal binarization circuit 24 EFM / CDROM encoder control Unit 25, 26 Memory 27 Sync signal generation / ATIP decoder 28 CDROM decoder control unit 29 Memory 3 Interface control unit 32 to 35 clock 36 address data bus 41 computer 42 keyboard 43 mouse 44 monitor 51 pulses S101~S120 step S201~S214 step

Claims (5)

[Claims] 1. A rotation drive mechanism for mounting and rotating an optical disk, an optical head, signal processing means for processing a signal read from the optical disk by the optical head, and at least the rotation drive mechanism, an optical head, and signal processing. An optical disk device for recording and reproducing the optical disk, wherein the number of tracks between a detection start position and a detection end position on the optical disk is divided into three or more, The optical head is moved to sequentially detect recording / non-recording of data at the division point from the detection start position, and the position between the division point read as unrecorded and the recording and read division point adjacent to this division point is read. An optical disc apparatus characterized by having an end detecting means for specifying that the end of the data recorded on the optical disc is located in the divided area. 2. The end detecting means sets the division point read as unrecorded as one of the detection start position and the detection end position, and sets the division point read as recorded as the detection start position and the detection end position. 2. The optical disc device according to claim 1, wherein the operation is repeated until the interval between the divided areas becomes smaller than a predetermined value. 3. When the interval between the divided areas becomes smaller than a predetermined value, the end detecting means continuously detects data recording / non-recording in the divided areas and records the data on the optical disc. 3. The optical disk device according to claim 2, wherein the optical disk device is configured to specify the end of data. 4. A counting means for counting the number of tracks through which the optical head passes, grasping the position of the optical head with respect to the optical disk based on the count value by the counting means, and moving the optical head to a target track. 4. The optical disk device according to claim 1, wherein the optical disk device is configured as described above. 5. The number of tracks between a detection start position and a detection end position on an optical disk is divided into three or more, and recording / non-recording of data at division points is sequentially detected from the detection start position and read as unrecorded. End point of data recorded on the optical disc in a divided area between the divided point and the divided point read and recorded adjacent to the divided point. Detection method.