JPH11328709A - Laser output setting method for optical disk recording/ reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a recording characteristic of an information signal even when the recording characteristics of a disk are different in a trial write area and a signal recording area by detecting a recording state of a recording start position at a recording end time, using the correction data set based on the detection data and correcting a laser output. SOLUTION: When the recording state isn't the prescribed recording state is decided, the correction data are calculated based on a difference between the prescribed recording state and the recording state of the information signal to be stored in a memory circuit. At a next recording operation time, the laser output is corrected based on the correction data, and the information signal is recorded from the recording start position by the corrected laser output. Such a recording operation is started, and the operation by prescribed steps are performed, and the recording operation of the information signal is ended. In such a manner, the recording operation of the information signal when the correction data are in the state being stored in the memory circuit is performed after the laser output is corrected.

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 out a signal recorded on a disk using an optical pickup have become widespread. 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 such an optical disk recording / reproducing apparatus, a pit is formed on a disk by a laser. However, if the laser output is not optimal, the pit shape may be too large or too small. Will do. Therefore, a disk used in such an optical disk recording / reproducing apparatus is provided with a test writing area on the innermost side, and after recording a signal in the test writing area, reproducing the signal, and detecting the reproduced signal. Is configured to set a laser output for recording by using such a technique. For example, such a technique is disclosed in Japanese Patent Application Laid-Open No. 6-76288.

[0004]

The laser output setting operation is performed based on data set in advance corresponding to the characteristics of the disk to be used. However, even if the same disk is used, a test signal is recorded. Recording characteristics vary not only between the test writing area to be written and the signal recording area where the information signal is recorded, but also within the signal recording area.

The recording operation of the information signal in the signal recording area is started by the laser output set by the recording / reproducing operation of the test signal in the test writing area. If the recording characteristics are different, the information signal is recorded. The recording operation is not performed in the best condition. Since recording characteristics in a signal recording area change, an apparatus has been developed that automatically adjusts a laser output based on a signal obtained from a light beam reflected from a disk during a recording operation.

Even if the recording characteristics in the signal recording area change, the recording characteristics can be improved by such an automatic adjusting device. However, if the laser output at the start of recording is not optimal, the recording operation of the information signal can be performed in the best condition. Cannot be done at

An object of the present invention is to provide a laser output setting method which improves such a point.

[0008]

According to the present invention, an information signal is recorded in a signal recording area by a laser output set by a recording / reproducing operation of a test signal in a test writing area, and a recording state of a recording start position at the end of recording is detected. The correction data is set based on the data, and the laser output set by the recording of the test signal at the next recording operation is corrected based on the correction data.

[0009]

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

In FIG. 2, reference numeral 1 denotes a disk mounted on a turntable (not shown) driven by a spindle motor (not shown) and rotated by the rotation of the turntable; An optical pickup in which a laser element for irradiating a light beam to the optical pickup and a photodetector for receiving a light beam reflected from the signal surface of the disc 1 are incorporated. This is a pickup feed motor that moves in the radial direction.

Reference numeral 4 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 5 denotes a signal obtained through the RF signal amplifying circuit 4. 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 6 denotes a digital signal processing circuit that performs digital signal processing of signals output from the RF signal amplifier circuit 4 and performs demodulation operations of various signals, and 7 denotes a digital signal processed by the digital signal processing circuit 6. 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 a function of outputting a digital signal to a computer device as it is.

Reference numeral 8 denotes an operation switch in which a switch for each operation which is operated when the operation of the optical disk recording / reproducing apparatus is switched is incorporated. Reference numeral 9 denotes a signal to which a signal demodulated by the digital signal processing circuit 6 is inputted. This is a system control circuit that performs various control operations in accordance with the operation of the operation switch 8, and includes a memory circuit 10. 11 is a pickup feed motor drive circuit whose operation is controlled by the system control circuit 9,
It has the function of controlling the rotation of the pickup feed motor 3.

A laser drive circuit 12 for driving a laser element incorporated in the optical pickup 2;
A laser output setting circuit 13 whose operation is controlled by the system control circuit 9 is configured to set the laser output by controlling the laser drive circuit 12. Reference numeral 14 denotes a signal recording circuit that receives a recording signal such as a test signal or an information signal and controls the laser irradiation operation of the laser driving circuit 12 in accordance with the signal to record the signal on the disk 1. is there.

A signal level detection circuit 15 receives a signal output from the RF signal amplifying circuit 4 and detects the level of the signal. The detection level is input to the system control circuit 9. It is configured.

In such a circuit configuration, when the disc 1 is inserted into the mounting portion of the disc in order to perform a signal recording operation, a laser output setting operation is performed. Such a laser output setting operation sets a laser output based on reference laser output data stored in advance in a memory circuit 10 provided in the system control circuit 9,
After performing an operation of recording a test signal in a test writing area provided on the innermost peripheral side of the disk 1 by the laser output, an operation of reproducing the recorded test signal is performed, and based on the reproduced signal, The laser output changing operation is repeatedly performed, and the operation is terminated when the laser output reaches an optimum laser output value for recording a signal on the disk 1.

The signal recording operation is started by the laser output set in this way. When the signal recording operation is being performed, the laser drive is performed by monitoring the change in the light reflected from the disk 1. The drive current supplied from the circuit 12 to the laser element is changed so that the laser output is always adjusted to the optimum laser output for the 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. Operation switch 8
Is operated, a control operation for a reproduction operation by the system control circuit 9 is started. When such a reproducing operation is performed, the laser element incorporated in the optical pickup 2 includes:
The drive current for obtaining a laser output for performing a signal read operation is set to be supplied from the laser drive circuit 12.

When the control operation for such a reproduction operation is started, the rotation control operation of the spindle motor by the spindle motor drive circuit (not shown) is performed, and the focusing control operation and the tracking control operation of the optical pickup 2 are performed. Is started, and the reading operation of the signal from the disk 1 by the optical pickup 2 is started. The signal read by the optical pickup 2 is input to the digital signal processing circuit 6 through the RF signal amplifier circuit 4 and the signal is demodulated. When signal processing is performed by the digital signal processing circuit 6 to extract information data, the information data is subjected to signal processing such as error correction and then applied to a signal reproduction circuit 7.

When the information data read from the disk 1 is an audio signal, the signal reproducing circuit 7 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 as it is to the computer device.

As described above, the reproducing operation in this embodiment is performed. Next, the signal recording operation will be described. When the recording disk 1 is inserted into the mounting portion of the disk, an operation of setting a laser output is performed by an operation of recording and reproducing a test signal in a test writing area described later.

When the laser output value is set by the operation of recording the test signal in the test writing area and the operation of reproducing the test signal, the operation of recording the signal input from the signal recording circuit 14 is started. Such a signal recording operation is performed on a signal recording area provided on the disc 1.

In the state where such a recording operation is being performed,
Since the temperature of the optical pickup 2 changes, the output of the laser and the wavelength of the laser change, and the recording characteristics for the disk 1 change. When the recording characteristics of the disk 1 change, the light reflected from the disk surface changes, so that the laser output value set by the laser output setting circuit 13 to correct the change is changed. Therefore, the signal recording operation on the disk 1 can be performed continuously with the recording characteristics at the start of recording.

The signal recording operation is released by operating the recording stop switch provided on the operation switch 8, but the recording operation is terminated by the position information indicating the signal recording position and the like. It is configured to complete by recording data or the like at a predetermined position. That is, a reproduction operation of a desired signal can be started by using such position information data, and a setting operation of a position at which a next recording operation is started can be performed.

The signal recording operation is performed as described above. Next, the laser output setting method according to the present invention will be described with reference to the flowchart shown in FIG.
When the recording disk is mounted on the disk mounting section, the laser output is set based on the reference laser output data stored in the memory circuit 10 (step A).
When the laser output is set based on the data stored in the memory circuit 10, a test signal recording operation is performed in a test writing area provided on the disk (step B).

After the test signal recording operation has been performed for a predetermined time, the recorded test signal is reproduced (step C). When the operation of reproducing the test signal is performed, the level of the reproduced signal is measured, and it is determined whether or not the level is optimal, that is, whether or not the laser output during recording is at the optimal level (step D). ).

If it is determined in step D that the level of the reproduction signal is not optimal, an operation for changing the laser output is performed (step E). This laser output changing operation compares the level of the signal to be reproduced with the level of the reproduced signal when recorded at the optimum laser output, and in the direction of the output recorded at the optimum level, for example, This is performed by changing one of the set output changing steps. When the operation of changing the laser output is performed in this manner, the process returns to step B and the above-described operation is performed.

The recording / reproducing operation of the test signal is repeatedly performed, and when it is determined in step D that the level of the reproduced signal is optimal, the laser output at the time of performing the recording operation of the signal is determined to be optimal. , The laser output is set to the value P (step F). When the laser output P is set in this way, it is determined whether correction data is stored in the memory circuit 10 (step G).

If it is determined in step G that there is no correction data, the optical pickup 2 is moved to the recording start position N in the signal recording area by the rotation driving operation of the pickup feed motor 3 and the control operation of the pickup control circuit 5.
And the recording operation of the information signal is performed by the laser output P (step H). The recording operation of the information signal in the signal recording area is started in this way, and the recording operation automatically corrects a change in the recording characteristics due to a change in the characteristics of the disk or a change in the temperature of the optical pickup 2. This is performed while varying the laser output (step I).

The recording operation of the information signal in the signal recording area is performed in this manner, and an operation of determining whether or not the recording operation is terminated by a stop operation or the like is performed (step J). If it is determined in step J that the recording operation has been completed, the optical pickup 2 is moved to the recording start position N, and the signal recorded at that position is reproduced to detect the recording state (step K). ).

When the recording state at the recording start position N is detected in step K, the recording state and the state where recording is performed with the laser output P set by the recording / reproducing operation of the test signal in the test writing area, That is, it is determined whether or not the recording state is the specified recording state (step L). If it is determined in step L that the recording state is the prescribed recording state, it is determined that the recording operation using the laser output P has been performed normally, and all the operations are completed.

If it is determined in step L that the recording state is not the prescribed recording state, correction data is calculated based on the difference between the prescribed recording state and the recording state of the information signal. It is stored (Step M). Such an operation is performed, and the operation of recording the information signal on the disk 1 ends.

As described above, the operation of recording the information signal on the disk 1 is performed. Next, the operation when the correction data is stored in the memory circuit 10 will be described. When an operation for performing the next recording operation is performed, the operations from step A to step F are performed, and the laser output P is set. When the setting operation of the laser output P is performed, the operation of step G, that is, the operation of determining whether or not there is correction data is performed.

In this case, the correction data is stored in the memory circuit 10
, It is determined that there is correction data. When such a determination operation is performed, the laser output P is corrected to the laser output Q based on the correction data, and the information signal is recorded from the recording start position M using the laser output Q (step N). When the recording operation is started, the operation from step I is performed thereafter, and the recording operation of the information signal ends.

The recording operation of the information signal when the correction data is stored in the memory circuit 10 is performed after the correction operation of the laser output is performed. The signal recording operation can be performed with the optimum characteristics even if the recording characteristics are different from those described above.

In this embodiment, the correction data is stored in the memory circuit 10 incorporated in the system circuit 9. However, when the correction data is recorded on a disk and a signal recording operation is performed, the correction data is read from the disk. , And the correction operation of the laser output is performed using the correction data. With this configuration, the laser output correction operation can be performed even when the signal recording operation is performed after the disk is exchanged or the power supply of the optical disk recording / reproducing device is cut off.

When the memory circuit 10 stores the disc identification number together with the correction data, the disc identification number read from the disc is identified even when the disc is exchanged, and the discrimination for the disc is identified. The laser output correction operation can be performed by recognizing the data.

[0038]

According to the present invention, an information signal is recorded in a signal recording area by a laser output set by a recording / reproducing operation of a test signal in a test writing area, and a recording state of a recording start position at the end of recording is detected. The correction data is set based on the detection data, and the laser output set by the recording of the test signal at the next recording operation is corrected based on the correction data. Even if it differs from the signal recording area, the recording characteristics of the information signal can be improved.

Further, according to the present invention, the correction data is set by detecting the recording state at the recording start position, that is, the recording state at the time of the first recording is detected. There is an advantage that a recording state which is not affected can be detected, and as a result, accurate correction data can be obtained.

According to the present invention, the correction data is recorded on the disk, and the laser output is corrected by reading the correction data recorded on the disk at the start of recording of the information signal. Even when the signal recording operation is performed after the power supply of the optical disk recording / reproducing device is cut off, the laser output correction operation can be performed.

Further, according to the present invention, the correction data is stored in a memory circuit together with the disk identification number, and the disk identification number stored in the memory circuit is read out after reading the disk identification number recorded on the disk at the start of recording of the information signal. Since the laser output is corrected by reading the correction data corresponding to the number, the disk identification number read from the disk is identified even when the disk is exchanged, and the correction data for the identified disk is recognized. Thereby, the correction operation of the laser output can be performed.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a laser output setting method according to the present invention.

FIG. 2 is a block circuit diagram showing one embodiment of an optical disk recording / reproducing apparatus according to the laser output setting method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 disc 2 optical pickup 4 RF signal amplification circuit 5 pickup control circuit 6 digital signal processing circuit 9 system control circuit 10 memory circuit 12 laser drive circuit 13 laser output setting circuit 15 signal level detection circuit

Claims (3)

[Claims] 1. A test signal is recorded on a test writing area provided on a disk by a laser irradiated from an optical pickup, and then a reproduction operation of the signal is performed. The output of the laser is adjusted in accordance with a recording state of the signal. In an optical disc recording / reproducing apparatus configured to set, an information signal is recorded in a signal recording area by a set laser output, and a recording state of a recording start position at the time of recording end is detected, and correction data is corrected based on the detected data. Wherein the laser output set by the recording of the test signal at the time of the next recording operation is corrected based on the correction data. 2. The laser output according to claim 1, wherein the correction data is recorded on a disk, and the laser output is corrected by reading the correction data recorded on the disk at the start of recording the information signal. Laser output setting method. 3. The correction data is stored in a memory circuit together with a disk identification number, and when the recording of an information signal is started, the disk identification number recorded on the disk is read out, and the readout data corresponds to the disk identification number stored in the memory circuit. 2. The laser output setting method according to claim 1, wherein the laser output is corrected by reading the corrected data.