JP2000251262A - Optical disc recording/playback apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disc recording/playback apparatus constituted to record signals on a disc by a laser beam irradiated from an optical pickup. SOLUTION: A synchronous deviation of synchronizing signals generated from Wobble signals from a reference signal is detected to initiate the recording operation of data signals when the synchronous deviation is near the center of an allowable range, but if not near the center, an optical pickup 2 is moved back to a position just the position at which the data signals are recorded and adjusted so that the synchronous deviation is near the center of the allowable range, and the data signal recording operation is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus configured to record a signal on a disk by a laser radiated from an optical pickup and to reproduce a signal recorded on the disk by the laser. About.

[0002]

2. Description of the Related Art Disk players which read signals recorded on a disk using an optical pickup have become widespread, but recently, in addition to a reproducing function, a disk irradiated by a laser emitted from the optical pickup has been used. An optical disk recording / reproducing apparatus configured to record a signal on the optical disk has been commercialized.

In recent years, it has been difficult to record a signal while controlling the rotation of the disk at a constant high linear velocity of 2 times, 4 times, 6 times, and 8 times the prescribed recording linear velocity. An optical disk recording / reproducing device configured to be capable of being developed has been developed.

In such an optical disk recording / reproducing apparatus, the rotation control operation of a spindle motor for rotating the disk at a constant linear velocity is generated from a wobble signal reproduced from a groove called a wobble provided on the disk. The synchronization is performed by synchronizing the synchronization signal with the reference signal output from the reference signal generation circuit. The recording operation of the optical disk recording / reproducing apparatus is performed normally when the synchronization deviation between the synchronization signal generated from the wobble signal and the reference signal output from the reference signal generation circuit is within an allowable range. It is configured.

[0005]

An optical disc recording / reproducing apparatus called a write-once type is configured to perform a signal recording operation in accordance with a recording command from a host. When the recording operation is completed, the signal is recorded. The TOC data indicating the recording position, the type of the recorded signal, and the like is recorded in a lead-in area provided on the disc. The recording operation of the TOC data in the lead-in area is configured to be performed by repeatedly recording information data in a buffer area provided on the disc by a predetermined number of frames and reading the recorded information data. I have.

In such an optical disk recording / reproducing apparatus,
When recording a data signal in the signal recording area, particularly when starting a signal recording operation at a constant high linear velocity, the disk may be affected by the eccentricity of the disk. When the value is outside the allowable range, the data signal recording operation may not be performed normally. In this case, there is a problem that not only the recording operation is interrupted, but also the disk is processed as a disk error, so that the disk itself cannot be used.

An object of the present invention is to provide an optical disk recording / reproducing apparatus which can solve such a problem.

[0008]

According to the present invention, at the start of recording a data signal, the optical pickup is moved to a position immediately before the position where the data signal is recorded, and a synchronization signal and a reference signal generated from a wobble signal are moved. A deviation in synchronization with the reference signal output from the generation circuit is detected, and when the deviation in synchronization is near the middle of the allowable range, the recording operation of the data signal is started, and the deviation in synchronization is within the allowable range. When the optical pickup is not near the middle, the optical pickup is retracted to the position immediately before the position where the data signal is recorded, and the recording operation of the data signal is started after adjusting the synchronization shift to be near the middle of the allowable range. It was made.

[0009]

FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention, and FIG. 2 is a diagram showing a recording format of a disk.

First, a recording format on a disk will be described with reference to FIG. On the disc, a test writing area A where a test signal is recorded when adjusting the recording laser output from the inner peripheral side, and information data indicating a signal recording position every time the recording operation of the data signal is completed is recorded. A buffer area B is provided, and a signal recording area for recording a signal is provided on the outer peripheral side of the buffer area B.

In the signal recording area of the disc, a lead-in area T1 in which TOC data indicating a signal recording position, a type of a recorded signal, and the like are recorded, and a lead-in area T1 corresponding to the TOC data recorded in the lead-in area T1. Data signal recording areas C and D in which the recorded signals are recorded and a lead-out area L1 are formed, and these areas, that is, T1, C,
D and L1 will be formed as one session. When the next recording operation is performed on the disc recorded in this manner, the lead-in area T2 where the TOC data is recorded, and the TO-recording area recorded in the lead-in area T2.
Data signal recording areas E, F, and G in which signals corresponding to the C data are recorded, and a lead-out area L2 are formed. Hereinafter, the data signal is recorded on the disk with the same configuration.

In FIG. 1, reference numeral 1 denotes a disk mounted on a turntable (not shown) driven to rotate by a spindle motor (not shown), and is configured to be driven to rotate by rotation of the turntable. Have been. Also. Position information data is recorded on the disc 1 by a groove called a wobble, and a signal recording / reproducing operation is performed based on a wobble signal obtained from the groove. Reference numeral 2 denotes a laser diode for irradiating the disk 1 with a light beam and a monitoring diode for monitoring light emitted from the laser diode, and a photodetector for receiving the light beam reflected from the signal surface of the disk 1. This is an optical pickup incorporated therein, and is configured to be moved in the radial direction of the disc 1 by a pickup feed motor (not shown).

Reference numeral 3 denotes an RF signal amplifying circuit for amplifying an RF signal obtained from a photodetector incorporated in the optical pickup 2 and shaping the waveform, and 4 denotes a signal obtained via the RF signal amplifying circuit 3. A pickup control circuit for performing focusing control for focusing a light beam of the optical pickup 2 on a signal surface of the disk 1 and tracking control for causing the light beam to follow a signal track on the signal surface.

Reference numeral 5 denotes a digital signal processing circuit that performs digital signal processing on the signal output from the RF signal amplifier circuit 3 and performs a demodulation operation of various signals, and 6 denotes a digital signal processed by the digital signal processing circuit 5. A signal reproducing circuit to which a signal is input. When the information recorded on the disc 1 is an audio signal, the signal is converted into an analog signal and then output to an amplifier or the like, and when the data signal is data such as computer software. Has the function of outputting the digital signal as it is to the computer device 7 provided as a host.

Reference numeral 8 denotes a system control circuit which receives a signal demodulated by the digital signal processing circuit 5 and performs various control operations in accordance with a command signal output from the computer device 7. Reference numeral 9 denotes a recording signal, such as a test signal or an information signal, which is input and controls a laser irradiation operation by a laser driving circuit (not shown) in accordance with the signal, thereby recording a data signal or the like on the disk 1. This is a signal recording circuit.

Reference numeral 10 denotes a buffer RAM for storing information data indicating a recording position of a data signal when a data signal recording operation is performed on a signal recording area provided on the disk 1.

As described above, the optical disk recording / reproducing apparatus according to the present invention is configured. Next, the reproducing operation in the circuit configured as described above will be described. A system control circuit 8 that constitutes a drive device from a computer device 7
When a command signal for performing a reproducing operation is output to the system controller 8, a control operation for the reproducing operation by the system control circuit 8 is started. When such a reproducing operation is performed, the laser diode incorporated in the optical pickup 2 is supplied with a driving current for obtaining a laser output for performing a signal reading operation from a laser driving circuit. Is set.

When the control operation for such a reproducing operation is started, the rotation control operation of the spindle motor is performed by a spindle motor control circuit (not shown). The disk 1 is rotated at a constant linear speed by comparing a synchronization signal obtained by decoding the signal with a reference signal output from a reference signal generation circuit (not shown). Such a control operation is similarly performed at the time of a signal recording operation described later.

The rotation control operation of the spindle motor is performed as described above. In the optical pickup 2 which performs a signal readout operation, the focusing control operation and the tracking control operation are started and the optical pickup 2 is started.
The operation of reading a signal from the disk 1 is started, but prior to the reproducing operation, the TO recorded on the lead-in area T1 constituting the first session of the disk 1
A read operation of C data is performed.

The operation of reading and reproducing the data signal recorded in the signal recording area of the first session of the disk 1 is performed based on the TOC data recorded in the lead-in area T1. The signal read by the optical pickup 2 is applied to an RF signal amplifier circuit 3
After being amplified and waveform-shaped, the signal is input to the digital signal processing circuit 5 to perform a signal demodulation operation. When signal processing is performed by the digital signal processing circuit 5 to extract information data, the information data is applied to a signal reproduction circuit 6 after signal processing such as error correction is performed.

When the information data read from the disc 1 is an audio signal, the signal reproducing circuit 6 converts the information data into an analog signal and outputs the analog signal to an amplifier or the like. In this case, the digital signal is output to the computer 7 as it is.

As described above, the reproducing operation is performed, and the reproducing operation is performed by the TO operation recorded in the lead-in area T1.
Since it is performed based on the C data, the reproduced signal is
This is recorded in the data signal recording areas C and D constituting the first session. Similarly, the TOC recorded in the lead-in area T2 constituting the next session
By reading the data, it is possible to perform the operation of reproducing the signals recorded in the data signal recording areas E, F and G in which the signals corresponding to the TOC data are recorded.

As described above, the reproducing operation in this embodiment is performed. Next, the operation of recording a signal on the disk 1 will be described.

The operation of recording a signal on the disk 1 is performed by first recording and reproducing a test signal in a test writing area A provided on the disk 1 so that a drive current at which an optimum laser output for the recording operation can be obtained is obtained by a laser diode. Is set to be supplied to When the laser output setting operation is performed, an operation of reading information data recorded in the buffer area B, that is, position information of a signal recorded in the signal recording area, and the like is performed.

Based on the information data read in this manner, whether a data signal recording operation is possible in a signal recording area provided on the disk 1, and where the recording operation is to be performed are determined. First, a case where a disc performs a recognition operation but has no data signal recorded thereon will be described.

In the case of such a disk, a signal is recorded from a predetermined position provided on the outer peripheral side of the buffer area B. However, the recording operation of the data signal is performed by setting a predetermined lead-in area T1. And started from the outer periphery side. In this manner, the recording operation is started. When a recording operation for one data is performed on the signal recording area C, information data indicating a position where the data signal is recorded is stored in the buffer RAM 10. Is done. The information data stored in the buffer RAM 10 is repeatedly recorded a predetermined number of times in a buffer area B provided on the disk 1.

Thus, the recording operation of the data signal for the signal recording area C is completed.
When a command for recording a next data signal is issued, an operation of reading information data recorded in the buffer area B is performed. The position where the next data signal is recorded, that is, the position of the track following the signal recording area C can be recognized based on the information data read in this way.

When the data signal to be recorded is input to the signal recording circuit 9 after the recognition operation is performed, the data signal is recorded in the signal recording area D as described above. When this operation is completed, the operation of storing information data in the buffer RAM 10 and the operation of recording information in the buffer area B are performed as described above.

When the recording operation of the data signal in the signal recording area D is completed, an instruction signal for terminating the recording operation using the data signals recorded in the signal recording areas C and D as one session is output from the computer device 7. Then, the read operation of the data signals recorded in the signal recording areas C and D is performed, the type of the recorded data signal, information data indicating the recording position, and the lead-out area L1
The operation of recording the TOC data such as the position information in the lead-in area T1 is performed. By performing such an operation, the recording operation of the first session including the lead-in area T1, the signal recording areas C and D, and the lead-out area L1 ends.

The recording operation on the disk 1 on which no data signal is recorded is performed in this manner. Next, a case where the recording operation is performed using the disk on which the first session is recorded will be described.

When an operation for starting a recording operation is performed using a disk on which the first session is recorded, a laser output setting operation and an operation of recognizing information recorded on the disk are performed. Such an operation is performed in the buffer area B
By reading the information data recorded on the disc, it is possible to recognize that the disc is a disc on which a data signal is recorded, and it is possible to recognize the position of the lead-in area T1 based on the information data.

When the position of the lead-in area T1 is recognized, the light beam of the optical pickup 2 is moved to the lead-in area T1, and the operation of reading the TOC data recorded in the lead-in area T1 is performed. Such TOC
By reading the data, the position of the lead-out area L1 can be recognized. Therefore, it becomes possible to recognize the start position of recording a new data signal, and the above-described recording operation is started from outside the lead-out area L1. By performing such a recording operation, the recording operation of the next session including the lead-in area T2, the signal recording areas E, F, G, and the lead-out area L2 ends.

The operation when the recording operation of each session ends is performed as described above. Next, the operation when the recording operation is ended without ending one session will be described. Such an operation is performed when a signal recording area constituting the same session is formed following the signal recording area recorded last. That is, such a recording operation is performed, for example, by ending the recording operation without recording the TOC data in the lead-in area T3.

For example, an operation in the case where the data signal is recorded only in the signal recording area H outside the lead-in area T3 and then the recording operation is terminated will be described. Signal recording area H
When the data signal is recorded in the buffer RAM 10, the information data indicating the recording position is stored in the buffer RAM 10 and the information data stored in the buffer RAM 10 is recorded in the buffer area B provided on the disk 1 as described above. Is done. After such a recording operation is performed, the recording operation is ended by the control operation of the computer device 7.

When the recording operation is completed in this way, no TOC data is recorded in the lead-in area T3. When an operation of starting the recording operation of the next data signal is performed using such a disk, the operation of setting the laser output and the operation of recognizing the information recorded on the disk are performed as described above.

In such an operation, by reading out the information data recorded in the buffer area B, it is recognized that the disc is a disc on which the data signal is recorded, and the information data is used to determine the position of the lead-in area T3. Can be recognized.

When the position of the lead-in area T3 is recognized, the operation of moving the light beam of the optical pickup 2 to the lead-in area T3 and reading out the TOC data recorded in the lead-in area T3 is performed. Is done,
In this case, since the TOC data is not recorded in the lead-in area T3, the TOC data cannot be read. Since such TOC data read operation is not performed, it can be recognized that the recording operation for ending the session has not been performed.

In this case, a position where the next data signal is recorded from the information data indicating the position where the signal recording region H is recorded in the information data recorded in the buffer region B, that is, the signal recording region H The position of the following track can be recognized.

After the recognition operation is performed, when a data signal to be recorded is input to the signal recording circuit 9, the data signal is recorded as a signal recording area I on the outer peripheral side of the signal recording area H as described above. However, when the operation is completed, the operation of storing the information data in the buffer RAM 10 and the operation of recording the information in the buffer area B are performed as described above. As described above, the signal recording operation is performed in the case of using the disc in which the TOC data is not recorded in the lead-in area T3, but the command signal for ending the recording operation of the session including the signal recording areas H and I is issued by the computer device 7. Then, the TOC data is recorded in the lead-in area T3 and the lead-out area is set as described above, and the recording operation ends.

As described above, the operation of recording a data signal on the disk 1 is performed. Next, the operation for recording TOC data in the lead-in area will be described.

When ending the recording operation of the first session, the TOC is stored in the lead-in area T1 as described above.
A processing operation of recording data, that is, the type of data signals recorded in the signal recording areas C and D, information data indicating the recording position thereof, and information data indicating the position of the lead-out area L1 is performed. Is performed, a signal recordable area on the outer peripheral side of the lead-out area L1, that is, an operation of detecting a recordable remaining amount is performed.

The operation of detecting the remaining recordable amount can be easily performed by calculating based on the recording capacity of the disk 1 and the position information of the lead-out area L1.
Then, the detected remaining recordable amount is a predetermined amount, for example, TO
It is determined whether or not there is a lead-in area for writing the C data, a lead-out area of a predetermined length, and a capacity that can provide the minimum number of tracks that must be provided for recording the data signal.

When it is determined that the recordable remaining amount is a predetermined amount by such a determination operation, normal TOC data is recorded in the lead-in area T1. Therefore,
The recording operation of the next session can be performed as described above. Conversely, if it is determined by the determination operation that the recordable remaining amount is not the predetermined amount, that is, is determined to be smaller than the predetermined amount,
In the lead-in area T1, normal TOC data, that is, the type of data signal recorded in the signal recording areas C and D, information data indicating its recording position, and information data indicating the position of the lead-out area L1, and the following: Non-recordable data for prohibiting the recording operation is recorded.

When such non-recordable data is recorded, the non-recordable data in the TOC data recorded in the lead-in area T1 is read out at the time of performing the next recording operation. It is possible to recognize that the disc cannot perform the recording operation. Therefore, when such non-recordable data is read, the recording operation cannot be performed so that useless recording operation can be prevented from being performed. The processing operation can be prevented from being performed.

As described above, the signal recording operation in this embodiment is performed. Next, the control operation at the start of the recording operation, which is the gist of the present invention, will be described. As described above, the recording operation of the data signal output from the computer device 7 to each signal recording area is performed. In the recording operation of the data signal, first, the optical pickup 2 is moved to a position immediately before the recording start position. At the same time, the control operation of the rotation speed of the disk is performed.

The rotation speed control operation is performed by synchronizing the synchronization signal generated from the wobble signal with the reference signal output from the reference signal generation circuit as described above. When moving to the position immediately before the start position, it is detected how much the synchronization between the synchronization signal generated from the wobble signal and the reference signal output from the reference signal generation circuit is shifted. When the detected synchronization shift is near the middle position of the allowable range, that is, when there is almost no synchronization shift, the recording operation of the data signal is started when the optical pickup 2 reaches the recording position of the data signal. You.

When it is determined by the above-described operation of detecting a synchronization deviation that the deviation is not near the intermediate position of the allowable range, the operation of retracting the position of the optical pickup 2 to a position immediately before the recording start position described above. In addition, the rotation control operation of the spindle motor is performed such that the synchronization shift is near the middle of the allowable range. By such an operation, the synchronization shift becomes near the middle of the allowable range, and the optical pickup 2
When the data reaches the data signal recording position, the data signal recording operation is started.

As described above, in the recording operation of the data signal, the synchronization deviation between the synchronization signal generated from the wobble signal and the synchronization signal output from the reference signal generation circuit is near the middle of the allowable range, that is, there is almost no synchronization deviation. , The data signal recording operation can be started in the best condition.

[0049]

According to the present invention, at the start of recording a data signal, the optical pickup is moved to a position immediately before the position where the data signal is recorded, and a synchronization signal generated from a wobble signal and an output from a reference signal generation circuit are output. A deviation of the synchronization with the reference signal to be detected is detected, and when the deviation of the synchronization is near the middle of the allowable range, the recording operation of the data signal is started, and the deviation of the synchronization is not near the middle of the allowable range. Sometimes, since the optical pickup is retracted to a position immediately before the position where the data signal is recorded, and the synchronization shift is adjusted to be near the middle of the allowable range, the recording operation of the data signal is started, so that The data signal recording operation can be started in the best condition. Therefore, since the recording operation of the data signal is started in the best state, the present invention is very useful in preventing the occurrence of a recording abnormality which often occurs at the start of the recording operation which is likely to be most unstable. It has a great effect.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a recording format of a disc.

[Explanation of symbols]

 Reference Signs List 1 disc 2 optical pickup 5 digital signal processing circuit 6 signal reproduction circuit 7 computer device 8 system control circuit 9 signal recording circuit 10 buffer RAM

Claims (1)

[Claims] After performing a data signal recording operation on a disc, information data indicating a recording position of the data signal is recorded in a buffer area provided on the disc, and the information data recorded in the buffer area is recorded. reading,
TOC data, which is information data of a data signal recorded based on the read information data, is recorded in a lead-in area, and is generated by a synchronization signal generated from a wobble signal and a reference signal generation circuit. An optical disc recording / reproducing apparatus configured to perform a recording operation when a deviation in synchronization with a reference signal to be performed is within an allowable range. The optical pickup is moved to the immediately preceding position, and the synchronization deviation between the synchronization signal generated from the wobble signal and the reference signal output from the reference signal generator is detected, and the synchronization deviation is near the middle of an allowable range. , The recording operation of the data signal is started, and when the deviation of the synchronization is not near the middle of the allowable range,
The optical pickup is retracted to a position immediately before the position where the data signal is recorded, and the recording operation of the data signal is started after the synchronization deviation is adjusted to be near the middle of the allowable range. Optical disk recording and playback device.