JP2001209942A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording/reproducing device capable of recording a signal on the disk with a laser emitted from an optical pickup. SOLUTION: This device is constituted so that the change of capacity of a data signal to be stored in a buffer RAM 11 provided so as once storing the data signal therein is detected when the recording operation of the data signal to the disk 1 is proceeded, and the recording speed to the disk 1 is adjusted to change based on the detected change of capacity.

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 addition, the specified linear velocity is doubled,
An optical disk recording / reproducing apparatus has been developed which is capable of recording signals while controlling the rotation of the disk at a constant high linear velocity such as double, six times, eight times, ten times, and twelve times. .

Recently, the linear velocity is not constant,
A technology has been developed that can record on a disk that is driven to rotate at a constant angular velocity so that the recording format has a constant linear velocity.

[0005]

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 normally performed, the recording signal output from the computer device is written to the buffer RAM, the signal is read from the buffer RAM, and the read operation is performed. The recording operation of the output signal on the disk is performed according to the amount of the recording signal and the recording state on the disk.

When a signal recording operation on a disk is performed at a speed higher than a specified speed, a buffer RAM is required.
In some cases, the amount of the signal to be written is insufficient with respect to the amount of the signal read from the memory. In such a case, the operation of recording the signal on the disk is interrupted, and the amount of the signal stored in the buffer RAM is reduced. When the predetermined amount is reached, an operation of restarting the operation of recording the signal on the disk is performed. According to such a configuration, even if the amount of signals stored in the buffer RAM is insufficient, the processing operation can be performed. However, when a large-capacity signal is to be recorded, the above-described recording interruption and recording restart The operation will be repeated frequently. As a result, there is a problem that the recording time becomes long despite the high-speed recording operation.

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

[0009]

SUMMARY OF THE INVENTION The present invention is directed to recording a data signal on a disk at a prescribed speed and at a speed higher than the prescribed speed and by reading out the data signal once stored in the buffer RAM. In the configured optical disk recording / reproducing apparatus, when a recording operation of a data signal to the disk is performed, a change in the capacity of the data signal stored in the buffer RAM is detected, and the disk is read based on the detected change in the capacity. The recording speed for recording is changed.

[0010]

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 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 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 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 that receives a signal demodulated by the digital signal processing circuit 5 and performs various control operations in accordance with command signals output from the computer device 7. A signal recording circuit that receives a recording signal such as a signal and controls a laser irradiation operation by the laser driving circuit 10 in accordance with the signal to record a data signal and the like on the disk 1. The laser driving circuit 10 has a function of supplying a driving current to the laser diode so that the laser diode incorporated in the optical pickup 2 emits a light beam for a reproducing operation and a light beam for performing a recording operation. The system control circuit 8 performs a servo operation based on a signal obtained from the monitoring diode and controls the laser output.

Reference numeral 11 denotes a buffer RAM in which a data signal recorded on the disk 1 is temporarily stored, in which a data signal output from the computer device 7 is written and which is stored by a control operation of the system control circuit 8. The operation and the read operation are configured to be controlled. The signal stored in the buffer RAM 11 is in a state of being stored and held even after being read to be recorded on the disk 1, and a new data signal output from the computer device 7 is stored at that position. The data is sequentially overwritten and erased.

Reference numeral 12 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8, which has a function of controlling the rotation of a spindle motor for driving the disk 1 to rotate. The rotational drive control operation is performed not only at the specified linear velocity but also at the specified speed 2
It is configured to be able to continuously change not only a constant linear velocity but also a constant angular velocity as well as a constant high linear velocity such as 2 ×, 4 ×, 6 ×, 8 ×, and 12 ×. .

In such a configuration, at the time of a signal recording operation on the disk 1, a data signal output from the computer device 7 is stored in the buffer RAM 11, and by controlling a reading operation of the stored signal, The recording operation of a signal on the disk 1 is configured to be controlled. The recording operation is performed by a recording clock signal generated based on a reference clock signal obtained from the disk 1. I have. Therefore, signals can be recorded in a prescribed recording format even when the rotational speed of the disk 1 is in various speed states. However, since such a technique is well known, description thereof will be omitted.

When the recording operation of the data signal on the disk 1 is interrupted and the recording operation is resumed, the signal stored in the buffer RAM 11 and the signal recorded on the disk 1 before the interruption are recorded. It is configured to perform a comparison operation with the existing signal and to record the signal continuously to the signal recorded before the interruption, that is, to record the data signal in a method called seamless.

In such a configuration, when the data signal recording operation is performed at a high rotational speed instead of the prescribed speed, if the amount of the data signal written in the buffer RAM 11 becomes insufficient, The recording speed is reduced by reducing the rotation speed of the disk 1. Further, the change in the amount of the data signal stored in the buffer RAM 11 is detected by comparing the transfer speed of the data signal output from the computer device 7 and the signal speed read from the buffer RAM 11, and its capacity is detected. Disc 1 based on change
It is configured to increase or decrease the rotation speed of.

When the rotation speed of the disk 1 at the time of recording is changed by the above-described operation, the laser drive circuit 10 is operated so that a laser output suitable for the rotation speed is obtained.
Is controlled by the system control circuit 8.

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. When a command signal for performing a reproducing operation is output from the computer device 7 to the system control circuit 8 constituting the disk drive device, a control operation for the reproducing operation by the system control circuit 8 is started. When such a reproducing operation is performed, a driving current for obtaining a laser output for performing a signal reading operation is supplied to the laser driving circuit 1 by a laser diode incorporated in the optical pickup 2.
It is set to be supplied from 0.

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 a synchronization signal obtained by the above with a reference signal output from a reference signal generation circuit (not shown), or at a constant angular velocity. . 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 disk 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 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 as follows. First, a test signal is recorded in a test writing area provided on the disk 1, and then the recorded signal is reproduced to obtain an optimum laser output for the recording operation. The obtained drive current is set to be supplied to the laser diode. When such a laser output setting operation is performed, the disc 1
An operation of reading information data recorded in an area called a buffer, 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 where the recording operation is to be 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 11 is performed. RA for the buffer
When a signal writing operation to M11 is performed, the storage amount of the signal stored in the buffer RAM 11 gradually increases. When the storage amount exceeds a predetermined amount, the signal stored in the buffer RAM 11 is read, and the read signal is input to the signal recording circuit 9. As a result, a control operation of the laser drive circuit by the signal recording circuit 9 is performed, and a signal such as data is recorded on the disk 1.

According to such an operation, a signal recording operation to the disk 1 is performed, and a signal writing operation to the buffer RAM 11 is performed according to a signal reading operation from the buffer RAM 11. Have been. In the state where the recording operation is normally performed,
Every time a signal is recorded on the disk 1, an address indicating the position, that is, an end address is stored in a memory circuit provided in the system control circuit 8.

When the signal recording operation on the disk 1 is interrupted, the signal reading operation from the buffer RAM 11 is interrupted. In this case, the signal writing to the buffer RAM 11 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 position where the recording is interrupted can be easily recognized from the final address stored in the memory circuit every time a normal recording operation is performed, and the optical pickup 2 can be moved to a desired position.

The signal reproduced by the 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 11 is performed. When 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 11 and stored subsequent to the signal subjected to the above-described 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 operation of interrupting the recording of the signal on the disk 1 and the operation of resuming the recording can be performed. By performing such an operation, the signal is continuously written 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 signal recording operation on the disk 1 is performed not at the specified speed but at a rotation speed higher than the specified speed. The operation when the amount of the data signal stored in the buffer RAM 11 is insufficient while the operation is being performed will be described.

Such a situation occurs when the amount of a signal output from the computer device 7 to the buffer RAM 11 and written is smaller than the amount of the signal read from the buffer RAM 11. This is caused by a delay in the processing operation.

In the state where the signal recording operation is being performed at the high rotational speed, it is determined that the signal cannot be recorded on the disk 1 due to the shortage of the signal stored in the buffer RAM 11. In such a case, a control operation for performing a recording operation by reducing the rotation speed of the disk 1 is performed. Such a determination operation detects the amount of the data signal stored in the buffer RAM 11 or detects and compares the transfer speed of the data signal output from the computer device 7 with the signal speed read from the buffer RAM 11. This is performed by detecting a change in the amount of the data signal stored in the buffer RAM 11.

As described above, the buffer RAM 11
If it is determined that the signal cannot be recorded on the disk 1 due to the shortage of the signal stored in the disk 1, the control operation for performing the recording operation by reducing the rotation speed of the disk 1 is performed. However, when the amount of stored signals increases, the disk 1
It is also possible to perform the recording operation by increasing the rotation speed of.

As described above, the amount of the data signal stored in the buffer RAM 11 and the amount of change in the amount of storage are detected, and the recording operation is performed by changing the rotation speed of the disk 1 based on the detected data. 1 can be performed without interruption, but if the data signal output from the computer device 7 is not output due to a delay in the arithmetic processing operation of the computer device 7 or the like, the recording operation on the disk 1 is stopped. Will not be performed.

In such a case, the operation of the system control circuit 8 based on the signal output from the computer device 7 causes a processing operation for interrupting the recording operation of the signal on the disk 1 to be performed. Further, when a processing operation for interrupting the signal recording operation on the disk 1 is performed, the buffer R
The operation of writing a signal to the AM 11 also stops, but the buffer RAM 11 is in a state where the signal recorded on the disk 1 before the interruption of the recording operation is stored and held. And
The final address is stored in the memory circuit incorporated in the system control circuit 8.

When the signal recording operation on the disk 1 cannot be performed, the above-described interruption processing operation is performed. However, a data signal is output from the computer device 7 and stored in the buffer RAM 11. When the data amount reaches the recordable amount, a processing operation for restarting the signal recording operation on the disk 1 is performed. When a signal can be recorded on the disk 1 by such a processing operation, the position where the optical pickup 2 starts the recording operation from the last address stored in the memory circuit, that is, the position is stored in the buffer RAM 11. After the recording operation is displaced to a position retracted from the position where the recording operation was interrupted due to the lack of the signal amount, the reproducing operation is performed from that position.

The signal reproduced by the reproducing operation is a signal recorded immediately before the recording operation is interrupted, and performs a comparison operation between the signal and the signal stored in the buffer RAM 11. When 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 11 and stored subsequent to the signal subjected to the above-described 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 recording operation is performed by changing the rotation speed of the disk 1 in accordance with the amount of the data signal stored in the buffer RAM 11 and the change in the stored capacity. Even if the recording speed on the disk 1 is higher than the transfer speed of the output data signal, the situation where the recording operation can be performed without interruption can be maintained for a long time.

The rotation speed of the disc 1 during the recording operation can be changed in various ways, for example, stepwise or continuously. However, since the output of the laser is changed and adjusted in accordance with each recording speed, the recording operation is performed. Can be performed without any trouble. And the adjustment operation of the laser output in such a case is as follows.
At the time of adjusting the laser output by recording the test signal in the test writing area, a parameter corresponding to the rotation speed of the disk 1 is detected and stored, and the adjustment can be performed based on the parameter. Further, the rotation speed of the disk 1 during the recording operation is changed, but the recording operation can be performed without any trouble by changing the servo characteristics of the optical pickup 2 in accordance with the respective recording speeds. Furthermore, the recording characteristics can be improved by changing the waveform of the recording pulse in accordance with the change in the rotation speed during the recording operation of the disk 1.

[0042]

According to the present invention, an optical disk which is configured to record a data signal on a disk at a specified speed and at a speed higher than the specified speed and by reading out the data signal once stored in the buffer RAM. In the recording / reproducing apparatus, when a data signal is recorded on the disk, a change in the capacity of the data signal stored in the buffer RAM is detected, and the recording speed on the disc is determined based on the detected change in the capacity. Is changed, it is possible to reduce the number of times the recording operation is interrupted due to an insufficient amount of data stored in the buffer RAM.

The present invention also relates to an optical disk configured to record a signal at a specified speed and at a speed higher than the specified speed and by reading out the data signal once stored in the buffer RAM. In the recording / reproducing apparatus, when a data signal is recorded on the disk, the capacity of the data signal stored in the buffer RAM is detected, and the recording speed on the disk is determined based on the detected capacity. Since the change is made continuously, the recording operation can be performed efficiently.

In the present invention, the output of the laser for performing the recording operation is changed according to the recording speed, so that the recording operation can be performed accurately. Furthermore, the present invention stores a parameter corresponding to the rotation speed of the disc when adjusting the laser output in the test writing area provided on the disc, and sets the output of the laser for performing the recording operation based on the parameter. Therefore, an optimum laser output can be obtained for each disc.

Further, according to the present invention, since the servo characteristics of the pickup performing the recording operation are changed in accordance with the recording speed, an accurate recording operation can be performed.

In the present invention, the waveform of the recording pulse for performing the recording operation is changed in accordance with the recording speed, so that an accurate recording operation can be performed.

[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 laser drive circuit 11 buffer RAM

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toru Tanaka 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Katsumi Hattori 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Akira Tsukihashi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (Reference) 5D044 BC04 CC04 EF03 EF06 5D090 AA01 BB04 CC01 DD03 DD05 FF07 FF30 HH01 HH03 KK03 LL07 5D109 AA12 FA27

Claims (7)

[Claims] An optical disk recording / reproducing apparatus configured to record a data signal on a disk by reading a data signal once stored in a buffer RAM at a predetermined speed and a speed higher than the predetermined speed. When performing a recording operation of a data signal on a disk, a change in the capacity of the data signal stored in the buffer RAM is detected, and the recording speed on the disk is changed based on the detected change in the capacity. An optical disk recording / reproducing apparatus characterized in that: 2. An optical disk recording / reproducing apparatus configured to record a data signal on a disk by reading a data signal once stored in a buffer RAM at a specified speed and at a speed higher than the specified speed. During the operation of recording the data signal on the disk, the capacity of the data signal stored in the buffer RAM is detected, and the recording speed on the disk is continuously changed based on the detected capacity. An optical disc recording / reproducing apparatus characterized in that: 3. The optical disk recording / reproducing apparatus according to claim 1, wherein an output of a laser for performing a recording operation is changed in accordance with a recording speed. 4. A method according to claim 1, wherein a parameter corresponding to the rotational speed of the disk is adjusted when adjusting a laser output in a test writing area provided on the disk, and a laser output for performing a recording operation is set based on the parameter. 4. The optical disk recording / reproducing apparatus according to claim 3, wherein: 5. The optical disk recording / reproducing apparatus according to claim 1, wherein a recording clock signal is generated based on a reference clock signal obtained from the disk. 6. The optical disk recording / reproducing apparatus according to claim 1, wherein a servo characteristic of an optical pickup that performs a recording operation in accordance with a recording speed is changed. 7. The optical disk recording / reproducing apparatus according to claim 1, wherein a waveform of a recording pulse for performing a recording operation is changed in accordance with a recording speed.