JP2002222562A - Method for controlling recording of optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording and reproducing device which can record signals on a disk with a laser beam emitted from an optical pickup. SOLUTION: An optical disk recording and reproducing device is presented in which the recording operation with constant angular velocity and recording with constant linear velocity are possible. After recognizing, on the basis of information recorded on the disk, the highest linear velocity at which recording can be made, judgment is made as to whether a recording starting position is the position where recording at the highest linear velocity for recording can be made. The recording speed control system is selected on the basis of the judgment.

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.

Recently, a disk is controlled to rotate at a constant high linear velocity such as 2, 4, 6, 8, 10, or 12 times the prescribed recording linear velocity. An optical disk recording / reproducing apparatus configured to record a signal has been developed. In order to perform a recording operation while controlling the rotation speed of the disk at a constant linear velocity, it is necessary to accurately perform the rotation control operation of the spindle motor M, and there is a limit to further increasing the linear velocity. There is. Therefore, recently, a technique has been developed in which the recording speed is increased by performing a recording operation in a state where the disk is rotated at a constant angular velocity.

[0004] Further, the recording disk has recorded thereon information indicating the recording speed of the disk, that is, the number of linear speeds that can be recorded with respect to a specified linear speed. Some of them are configured such that the recording speed can be set by recognizing this information before starting the recording operation.

[0005]

When a recording operation is performed at a constant linear velocity, the rotational speed of the disk, that is, the angular velocity is higher on the inner peripheral side of the disk than on the outer peripheral side, so that the recording position is on the inner peripheral side. In such a case, it is necessary to increase the rotation speed of the spindle motor for rotating the disk.
However, a spindle motor that can rotate at high speed is not only expensive, but also makes it very difficult to perform accurate speed control operation. Will not be able to do.

As a method for solving such a problem, a technique has been developed in which the rotation operation of the disk is performed at a constant angular velocity, and the signal recording operation is performed in this state. When performing a signal recording operation with a constant angular velocity, the linear velocity at the recording position becomes higher as the recording position moves from the inner peripheral side to the outer peripheral side. If the linear velocity is exceeded, the recording operation cannot be performed.

An object of the present invention is to provide a recording control method for an optical disk recording / reproducing apparatus which solves the above problem.

[0008]

According to the present invention, in an optical disk recording / reproducing apparatus capable of performing a recording operation at a constant angular velocity and a recording operation at a constant linear velocity, the recording start position is determined after recognizing the maximum recordable linear velocity based on information recorded on the disk. It is determined whether or not the position is a recordable position based on the maximum recordable linear velocity, and a recording speed control method is selected based on the determination.

[0009]

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

In FIG. 2, reference numeral 1 denotes a spindle motor M
The disk is mounted on a turntable (not shown) that is driven to rotate by the rotary table, and is configured to be driven to rotate by rotation of the turntable. Also. On the disc 1, position information data and information indicating the maximum recordable linear velocity of the disc are recorded by a groove called a wobble. A signal recording / reproducing operation is performed based on a wobble signal obtained from the groove. Is configured to be performed. 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. The optical pickup is 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 a focusing control operation for focusing a light beam of the optical pickup 2 on a signal surface of the disk 1 and a tracking control operation for causing the light beam to follow a signal track on the signal surface based on the focus servo. A circuit and a tracking servo circuit are 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 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 recorded on the disk 1 is temporarily stored, in which a signal output from the computer device 7 is written, and a signal storage / write operation and a signal writing / writing operation under the control of the system control circuit 8. The reading operation is controlled. Reference numeral 11 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8, and has an operation of controlling the rotational drive of a spindle motor M that drives the disk 1 to rotate. The rotation drive operation by the spindle motor drive circuit 11 is performed such that the disk 1 can be rotated at a constant maximum recordable linear velocity provided on the disk 1 on the outer peripheral side from a predetermined position. Further, it is configured to be able to rotate in a state where the angular velocity is constant.

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 the read operation of the stored signal is controlled to control the disk operation. 1 is configured to control a signal recording operation.

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 M by the spindle motor drive circuit 11 is performed. The disk 1 is rotated at a constant linear velocity by comparing a synchronization signal obtained by decoding 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. In addition, when performing a reproducing operation at a constant angular velocity, the spindle motor M is rotationally driven and controlled so as to have a set angular velocity. This control operation is also performed at the time of a signal recording operation described later.

The rotation control operation of the spindle motor M is as follows.
As described above, in the optical pickup 2 performing the signal reading operation, the focusing control operation and the tracking control operation are started, and the signal reading operation from the disk 1 by the optical pickup 2 is started. Prior to the reproduction operation, the TOC recorded in the lead-in area constituting the first session of the disc 1
A data read operation is performed.

The reading and reproducing operation of the signal recorded in the signal recording area of the first session provided on 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 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 optimal 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 a position on the disk 1 where the recording operation is started, and the recording signal is written into the buffer RAM 10. 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, and 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.

The recording operation described above is an operation in a case where the recording operation in all the recording areas provided on the disk 1 can be performed at a constant linear velocity and a constant angular velocity. This is an operation when the recording speed is about 12 times slower than the specified linear velocity. Next, a recording control method according to the gist of the present invention will be described with reference to the flowchart shown in FIG.

Such an operation is performed when the maximum recordable linear velocity of the disk 1 is, for example, 24 times higher than the specified velocity and can be recorded at a high speed. This is performed when it is not possible to drive the rotation so that

When the switching operation for performing the recording operation is performed after the disk 1 is inserted into the mounting portion provided in the optical disk recording / reproducing apparatus, the information recorded on the disk 1 is read, and the reading operation is performed. Based on the obtained information, the maximum recordable linear velocity of the disc 1 is recognized (step A). When the maximum recordable linear velocity of the disc 1 is recognized, a determination is made as to whether or not the signal recording start position is a position at which the recording operation at the maximum recordable linear velocity can be performed. (Step B). Such a determination operation can be determined from the relationship between the linear velocity at the recording position and the maximum recordable linear velocity when the rotation speed of the disk 1 by the spindle motor M is maximized. Can be performed based on the data stored in the.

If it is determined in step B that the recording start position is a position where the recording operation at the maximum recordable linear velocity can be performed, the recording operation is performed at the constant maximum recordable linear velocity ( Step C). When such a recording operation is started, the recording position moves to the outer peripheral side of the disk 1.
Will gradually decrease. Therefore, the recording operation at the constant maximum recordable linear velocity can be performed up to the outermost peripheral position of the signal recording area, and the recording operation is completed according to the recording operation release command.

If it is determined in step B that the recording start position is a position where the recording operation can be performed at the maximum recordable linear velocity, the recording is performed at the constant maximum recordable linear velocity as described above. The operation is performed. Next, the operation in the case where it is determined that the recording start position is the position where the recording operation at the maximum recordable linear velocity cannot be performed is determined.

If it is determined that the recording start position is a position where the recording operation at the maximum recordable linear velocity cannot be performed, the recording operation is performed at a constant angular velocity (step D). In this way, the recording operation on the disk 1 that is driven to rotate at a constant angular velocity is started, and the linear velocity at the recording position gradually increases as the recording position moves to the outer peripheral side. While such a recording operation is being performed, it is determined whether or not the recording position has always moved to a position where the recording operation at the maximum recordable linear velocity can be performed (step E).

While it is determined in step E that the recording position has not moved to a position at which the recording operation with the constant maximum recordable linear velocity can be performed, the recording operation with the constant angular velocity is performed. When it is determined that the recording position has been moved, the state is switched to a state in which the recording operation is performed at a constant maximum recordable linear velocity (step F).

In this manner, the recording operation is switched from the recording operation with the constant angular velocity to the recording operation with the constant maximum recordable linear velocity. After that, the recording operation with the constant maximum recordable linear velocity is performed until the end of recording. Become.

The switching operation from the recording operation state with the constant angular velocity to the recording state with the constant maximum recordable linear velocity is performed as described above. Whether the linear velocity at the recording position has reached the maximum recordable linear velocity is determined. Is determined by the disc 1
Can be performed based on the position information data recorded in the. Further, by detecting the position of the pickup, that is, the distance from the center of the disk, it is also possible to detect whether the linear velocity at the recording position has reached the maximum recordable linear velocity. Further, since the linear velocity can be measured by measuring the time between the synchronization signals recorded as the wobble signal on the disk 1, the linear velocity can be measured.
It is also possible to perform an operation of determining whether the linear velocity at the recording position has reached the maximum recordable linear velocity based on the measured value.

[0035]

The present invention relates to an optical disk recording / reproducing apparatus capable of performing a recording operation at a constant angular velocity and a recording operation at a constant linear velocity, and recognizes a maximum recordable linear velocity on the basis of information recorded on the disk and then starts a recording start position. Is determined as to whether or not it is a recordable position at the maximum recordable linear velocity, and the recording speed control method is selected based on the determination, so that the recording operation can be performed efficiently.

Further, according to the present invention, when it is determined that the recording start position is the recordable position at the maximum recordable linear velocity, the recording operation is started at the constant maximum recordable linear velocity. There is no need to uselessly change the method.

According to the present invention, the recording operation is started at a constant angular velocity when it is determined that the recording start position is the recording impossible position at the maximum recordable linear velocity. , The recording operation can be started.

Further, according to the present invention, in a recording operation state with a constant angular velocity, when the recording position is moved to a recordable position with a constant maximum recordable linear velocity, the state is switched to a state in which the recording operation with a constant maximum recordable linear velocity is performed. Therefore, the recording operation can be performed efficiently.

According to the present invention, in the recording operation state with the constant angular velocity, it is determined whether or not the recording position has moved to the recordable position with the constant maximum recordable linear velocity based on the position information data recorded on the disk. , An accurate determination operation can be performed.

Further, according to the present invention, in the recording operation state in which the angular velocity is constant, whether or not the recording position has moved to the recordable position in which the maximum recordable linear velocity is constant is determined by the position of the pickup. Since the position of the pickup can be detected in a specific manner, there is an advantage that the configuration is simplified.

According to the present invention, in a recording operation state at a constant angular velocity, whether or not the recording position has moved to a recordable position at a constant maximum recordable linear velocity is determined by a synchronization signal recorded on the disk. Because
The linear velocity can be measured accurately, and as a result, an accurate switching operation of the velocity control method can be performed.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a recording control method of the present invention.

FIG. 2 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 (7)

[Claims] 1. An optical disk recording / reproducing apparatus capable of performing a recording operation at a constant angular velocity and a recording operation at a constant linear velocity. After recognizing a maximum recordable linear velocity based on information recorded on the disk, the recording start position is determined. A recording control method for an optical disk recording / reproducing apparatus, comprising: determining whether a position is a recordable position at a maximum linear velocity, and selecting a recording speed control method based on the determination. 2. When the recording start position is determined to be a recordable position at the maximum recordable linear velocity, the recording operation is started at a constant maximum recordable linear velocity. 3. The recording control method according to item 1. 3. The recording operation according to claim 1, wherein the recording operation is started at a constant angular velocity when it is determined that the recording start position is a recording impossible position based on the maximum recordable linear velocity. Recording control method. 4. The apparatus according to claim 3, wherein when the recording position is moved to a recordable position at a constant maximum recordable linear velocity after the start of recording, the recording operation is switched to a state of performing a recording operation at a constant maximum recordable linear velocity. 3. The recording control method according to item 1. 5. The apparatus according to claim 1, wherein after the recording is started, whether or not the recording position has moved to a recordable position at a constant maximum recordable linear velocity is determined based on position information data recorded on the disk. 5. The recording control method according to item 4. 6. The recording control according to claim 4, wherein after the recording is started, whether or not the recording position has moved to a recordable position at a constant maximum recordable linear velocity is determined based on the position of the pickup. Method. 7. The method according to claim 4, wherein after the recording is started, whether or not the recording position has moved to a recordable position at a constant maximum recordable linear velocity is determined based on a synchronization signal recorded on the disk. 3. The recording control method according to item 1.