JP2001006271A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording/reproducing device constituted so that a signal is recorded on the disk by the irradiation with a laser from an optical pickup. SOLUTION: The optical disk recording/reproducing device constituted in such a manner that the signal once stored in a RAM 10 for buffer is recorded on the disk 1 by reading this signal, is arranged so that the writing operation of the signal into the RAM 10 for buffer is changed over to a periodically performing state from normal operation when the recording operation of the signal to the disk 1 is interrupted due to the shortage of the capacity of the signal stored in the RAM 10 for buffer.

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.

[0004]

The optical disk recording / reproducing apparatus is configured to perform a signal recording operation in accordance with a recording command from a computer device serving as a host. Is temporarily stored in a buffer RAM, and a signal stored in the buffer RAM is read to perform a signal recording operation on a disk.

In a state where the signal recording operation to the disk is performed normally, the recording signal output from the computer device is written to the buffer RAM, the signal is read from the buffer RAM, and the signal is read. The operation of recording the output signal on the disk is performed according to the amount of the recording signal and the state of recording on the disk. In such a recording state, if the operation of writing the signal to the buffer RAM is delayed as compared with the operation of recording the signal to the disk, the signal to be recorded on the disk becomes insufficient, and the operation of recording the signal to the disk is interrupted. Will be done.

In the state where the signal recording operation is being performed on the disk, if for some reason the signal recording operation cannot be performed on the disk, the signal recording operation on the disk is temporarily interrupted. When the recording operation returns to a state where the recording operation can be performed, the recording operation is restarted from the position where the recording operation was interrupted.

In a conventional optical disk recording / reproducing apparatus, when the operation of recording a signal on such a disk is interrupted, the operation of writing a signal to the buffer RAM is also interrupted. When the recording operation is resumed after the recording operation is interrupted, the operation of setting the recording start position of the signal to the interrupted position or the signal to be recorded is continuous with the signal recorded before the interruption. A processing operation to be performed, that is, a processing operation called retry will be performed,
The time required for such an operation increases.

If the writing operation of the signal to the buffer RAM is interrupted during such time, the recording operation becomes abnormal when viewed from the computer device, and it is determined that the recording operation cannot be continued any more. In some cases, an abnormal processing operation was performed.

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

[0010]

SUMMARY OF THE INVENTION The present invention provides a buffer R
In an optical disc recording / reproducing apparatus configured to record a signal on a disc by reading a signal once stored in the AM, the capacity of a signal stored in the buffer RAM is insufficient during a signal recording operation on the disc. When the signal recording operation to the disc is interrupted,
It is configured to switch to a state in which the operation of writing a signal to the buffer RAM is periodically performed from the normal operation.

[0011]

FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention. 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. . 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 that amplifies an RF signal obtained from a photodetector incorporated in the optical pickup 2 and shapes the waveform, and 4 denotes a signal obtained through 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 following the light beam to a signal track on the signal surface based on the focus servo circuit and A tracking servo circuit is incorporated.

Reference numeral 5 denotes a digital signal processing circuit that performs digital signal processing of signals output from the RF signal amplifier circuit 3 and performs demodulation operations 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 in which a signal to be recorded on the disk 1 is temporarily stored, in which a signal output from the computer device 7 is written, and a signal storage operation and a read operation by a control operation of the system control circuit 8. The operation is configured to be controlled. 1
Reference numeral 1 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8, and has an operation of controlling the rotation of a spindle motor for rotating the disk 1. Such a rotational drive control operation can be performed at a constant linear velocity such as twice, four times, six times or eight times the prescribed velocity as well as the prescribed linear velocity. Is configured.

In such a configuration, during a signal recording operation on the disk 1, a signal output from the computer device 7 is stored in the buffer RAM 10, and a read operation of the stored signal is controlled to control the disk operation. 1 is configured to control the operation of recording a signal into the first signal. When the recording operation is resumed after the signal recording operation on the disk 1 is interrupted, the signal stored in the buffer RAM 10 and the signal recorded on the disk 1 before the interruption are resumed. The comparison operation is performed so that the signal is recorded continuously to the signal recorded before the interruption, that is, the signal is recorded in a method called seamless.

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 reproduction operation is started, the rotation control operation of the spindle motor is performed by the spindle motor drive circuit 11. The rotation control operation of the spindle motor decodes the wobble signal. The disk 1 is driven to rotate at a constant linear velocity by comparing the synchronization signal obtained as described above 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 reading operation of the signal from the disc 1 is started. Before the reproducing operation, the reading operation of the TOC data recorded in the lead-in area constituting the first session of the disc 1 is performed.

The reading and reproducing operation of the signal recorded in the signal recording area of the first session of the disc 1 is performed based on the TOC data recorded in the lead-in area. The signal read by the optical pickup 2 is amplified and shaped by an RF signal amplifying circuit 3 and then input to a digital signal processing circuit 5 where the signal is demodulated. 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 in the present 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 provided on the disk 1 so that a drive current for obtaining a laser output optimum for the recording operation is supplied to the laser diode. Set to be supplied. When such a laser output setting operation is performed, an operation of reading out information data recorded in an area called a buffer of the disk 1, that is, position information of a signal recorded in a signal recording area is performed.

Based on the information data read in this manner, whether a data signal recording operation can be performed in a signal recording area provided on the disk 1 and the position at which the recording operation is performed are determined. A recognition operation is performed.

When the recognition processing operation is completed, the optical pickup 2 is moved to the position where the recording operation on the disk 1 is started, and the operation of writing the recording signal to the buffer RAM 10 is performed. RA for the buffer
When the operation of writing a signal to M10 is performed, the storage amount of the signal stored in the buffer RAM 10 gradually increases. When the storage amount exceeds a predetermined amount, the signal stored in the buffer RAM 10 is read out,
The read signal is input to the signal recording circuit 9. As a result, the control operation of the laser drive circuit by the signal recording circuit 9 is performed, and a signal is recorded on the disk 1.

The signal recording operation to the disk 1 is performed by such an operation, but the signal writing operation to the buffer RAM 10 is performed as a normal operation.
It is configured to be performed in response to a signal read operation from the AM 10. In the operation of writing a signal to the buffer RAM 10, when a signal read operation is performed, an operation of newly writing a signal at a position where the read signal is stored is repeatedly performed.

When the operation of recording the signal on the disk 1 is interrupted, the operation of reading the signal from the buffer RAM 10 is interrupted. In this case, the writing of the signal to the buffer RAM 10 is performed. The operation is also interrupted. When an operation of starting a signal recording operation on the disc 1 is performed from such a state, the optical pickup 2 is displaced to a position where the recording operation is started, that is, a position where the optical pickup 2 is retracted from a position where the recording operation is interrupted.
The reproduction operation is performed from that position.

The signal reproduced by such a reproducing operation is a signal recorded immediately before the recording operation is interrupted, and a comparison operation between the signal and the signal stored in the buffer RAM 10 is performed. If it is determined by the comparison operation that the two signals are the same signal, the reading of the signal stored in the buffer RAM 10 and subsequently to the signal subjected to the comparison operation is performed. The operation is performed and the signal is input to the signal recording circuit 9 to start the signal recording operation on the disk 1. By the above-described operation, the recording interruption operation and the recording resuming operation of the signal on the disk 1 can be performed, and by performing such operations, the signal is continuously recorded on the disk 1 despite the interruption of the recording operation. A recording operation, that is, a so-called seamless recording operation can be performed.

As described above, the signal recording operation in this embodiment is performed. Next, the case where the signal writing operation to the buffer RAM 10 is delayed with respect to the signal recording operation to the disk 1 will be described. explain. In such a state, the amount of signals stored in the buffer RAM 10 gradually decreases as the operation of recording signals on the disk 1 proceeds.

If the amount of the signal stored in the buffer RAM 10 falls below a predetermined amount, the signal to be recorded on the disk 1 becomes insufficient, so that the operation of recording the signal on the disk 1 is interrupted and the buffer for the buffer 1 is stopped. The normal operation of writing a signal to the RAM is not performed. Such a state is a phenomenon generally called a buffer underrun, and is a phenomenon that often occurs in an optical disk recording / reproducing apparatus that can perform a signal recording operation on the disk 1 at a high speed.

According to the present invention, when such a buffer underrun state occurs, the operation of writing a signal to the buffer RAM 10 is periodically performed.
If the writing operation of the signal to the buffer RAM 10 is not performed for a predetermined time, the computer device 7 does not determine that the recording is abnormal.
The operation of writing a signal to the AM 10 is periodically performed so that the computer device 7 does not perform an abnormality determination operation by such an operation.

Since the writing operation of the signal to the buffer RAM 10 is periodically performed to prevent the computer device 7 from determining that the recording is abnormal, the optical disk recording / reproducing device uses An operation for restarting signal recording, that is, a retry processing operation is performed, and the buffer RAM 1
The periodic writing operation of the signal to 0 will be continued.

In this state, when a retry processing operation is performed and the state returns to a state in which a signal can be recorded on the disk 1, the operation of writing a signal to the buffer RAM 10 is changed from a periodical write operation. An operation of switching to a state where a normal write operation is performed is performed. When such a switching operation is performed, the buffer RAM 10
The operation returns to a state in which the operation of writing a signal to the disk, the operation of reading a signal from the buffer RAM 10, and the operation of recording a signal to the disk 1 are performed, and the optical disk recording / reproducing apparatus resumes the recording operation.

As described above, the restart of the recording operation is performed by reproducing the signal recorded on the disk 1 before the interruption, and comparing the reproduced signal with the signal stored in the buffer RAM 10. By performing the operation, the recording operation is performed seamlessly.

[0035]

According to the present invention, there is provided an optical disk recording / reproducing apparatus which is configured to record a signal once stored in a buffer RAM and to record the signal on the disk. RA
When the signal recording operation on the disk is interrupted due to the lack of the capacity of the signal stored in M, the operation of writing the signal to the buffer RAM is switched from the normal operation to the regular operation. , Buffer RA
It is possible to prevent a computer device serving as a host from performing an abnormality determination operation due to a write operation not being performed on M for a predetermined time.

Further, according to the present invention, when the capacity of the signal written in the buffer RAM reaches a predetermined value, the signal recording operation on the disk is restarted, so that the signal recording operation is performed efficiently. I can do it.

According to the present invention, when the recording operation of the signal to the disk is resumed, the operation of writing the signal to the buffer RAM is switched to the normal operation. Can be performed promptly.

[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.

[Explanation of symbols]

 Reference Signs List 1 disc 2 optical pickup 4 pickup control circuit 5 digital signal processing circuit 7 computer device 8 system control circuit 10 buffer RAM 11 spindle motor drive circuit

Claims (3)

[Claims] 1. An optical disk recording / reproducing apparatus configured to record a signal once on a disk by reading a signal once stored on a buffer RAM, and to store the signal on the buffer RAM during a signal recording operation on the disk. When the signal recording operation on the disk is interrupted due to insufficient signal capacity, the operation of writing the signal to the buffer RAM is switched from a normal operation to a periodical operation. Optical disk recording and playback device. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein when the capacity of the signal written in the buffer RAM reaches a predetermined value, the operation of recording the signal on the disk is restarted. apparatus. 3. The method according to claim 2, wherein when the recording operation of the signal on the disk is resumed, the operation of writing the signal to the buffer RAM is switched to a state of performing a normal operation. Optical disk recording and playback device.