JP3485845B2 - Recording control method for optical disk recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording a signal on a disk by a laser radiated from an optical pickup and a reproducing operation for the signal recorded on the disk by the laser. The present invention relates to an optical disk recording / reproducing device configured to perform the operation. 2. Description of the Related Art Disk players for reading signals recorded on a disk using an optical pickup have become widespread, but recently, in addition to a reproducing function, the optical pickup emits light. 2. Description of the Related Art An optical disk recording / reproducing apparatus configured to be able to record a signal on a disk by a laser has been commercialized. [0003] In such an optical disk recording / reproducing apparatus, pits are formed on a disk by a laser. However, if the output of the laser is not optimal, the pit shape may be too large or too small. Will do. Therefore, a disc used in such an optical disc 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. A laser output for recording is set according to the method described above. Such a technique is disclosed in, for example, JP-A-6-76288. The operation of recording a signal in the data signal recording area provided on the disk is started by the laser output set in this manner. This is performed by alternately changing the output for the application. The signal recording operation is optimized for the recording operation by changing the value of the drive current supplied to the laser diode from the laser output control circuit by monitoring the amount of light beam output from the laser diode with the monitor diode. It is configured to adjust to the laser output, but at this time, the rotation speed of the disk is controlled using the signal read from the disk with the light beam output from the laser diode driven by the output for reproduction It is configured to [0005] The automatic adjustment of the laser output is performed by sampling a monitor signal obtained from a monitor diode and performing the operation based on the sampled signal. The operation of recording a signal on a disk is performed by forming a pit on a signal track provided on the disk by a light beam output from a laser diode. The size of the pit is set to a specified size. The recording operation of such a signal is performed by rotating the disk at a predetermined linear velocity, but recently, the recording is performed in a state where the linear velocity during the recording operation is several times the predetermined velocity. An optical disk recording / reproducing apparatus capable of performing such operations has been commercialized. When a command signal for recording a signal on a disk is applied to a laser output control circuit, a drive signal is supplied to a laser diode, and a light beam is emitted from the laser diode to the disk to record the signal. The operation is started. In the recording operation, the monitor diode receives the light beam emitted from the laser diode, outputs a monitor signal corresponding to the light amount, and is based on a signal extracted by sampling from the monitor signal. Thus, the laser output adjustment operation is automatically performed by a circuit called an automatic adjustment circuit. When the rotation speed of the disk increases, the irradiation time of the light beam output from the laser diode for performing the signal recording operation decreases. As a result, the sampling operation time of the monitor signal obtained from the monitor diode for performing the laser output adjustment operation also becomes short, and it becomes difficult to perform the laser output adjustment operation accurately. The adjustment of the laser output by the above-described automatic adjustment circuit is not effective for all the speeds at which signals are recorded on the disk and all the characteristics of the disk.
Not only when the adjustment operation by the automatic adjustment circuit does not work effectively, but also the recording characteristics may be deteriorated. An object of the present invention is to provide a recording control method for an optical disk recording / reproducing apparatus which improves the above points. According to the present invention, a test signal is recorded in a test writing area provided on the inner peripheral side of a disk while changing a laser output, and the recorded test signal is reproduced.
The laser output setting operation is performed by detecting the reproduction characteristics of the signal, and the reproduction level of the test signal recorded in the test writing area is the same as the level change set in advance corresponding to the laser output change. The automatic adjustment circuit that automatically adjusts the laser output to the set laser output when the operation is performed is configured to operate. 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 driven to rotate by rotation of the turntable. The indicated position information data is recorded by a groove called a pre-groove, and recording and reproduction of signals are performed based on a signal called a wobble obtained from the groove. Reference numeral 2 denotes a laser diode for irradiating the disc 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 disc 1 is provided. The incorporated optical pickup 3 is a pickup feed motor for moving the optical pickup 2 in the radial direction of the disk 1. 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 via the RF signal amplifying circuit 4. 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. 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 signal is a data signal 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 operated when switching the operation of the optical disk recording / reproducing apparatus is incorporated. Reference numeral 9 denotes a signal to which a signal demodulated by the digital signal processing circuit 6 is input. This is a system control circuit that performs various control operations according to the operation of the operation switch 8. Reference numeral 10 denotes a pickup feed motor driving circuit whose operation is controlled by the system control circuit 9, and has an operation of controlling the rotation of the pickup feed motor 3. Reference numeral 11 denotes a laser drive circuit for driving a laser diode incorporated in the optical pickup 2, and reference numeral 12 denotes a laser output control circuit whose operation is controlled by the system control circuit 9. It is configured to set the output of the laser by controlling. Reference numeral 13 denotes a signal recording circuit which receives a recording signal such as a test signal or an information signal and controls the laser irradiation operation of the laser driving circuit 11 in accordance with the signal to record the signal on the disk 1. is there. Reference numeral 14 denotes a reflected light amount detection circuit which receives a signal obtained from a photodetector incorporated in the optical pickup 2 and detects the amount of reflected light by detecting the level of the signal. The output is configured to be input to the system control circuit 9. 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, a driving current for obtaining a laser output for performing a signal reading operation is supplied from the laser driving circuit 11 to the laser diode incorporated in the optical pickup 2. Is set to When the control operation for such a reproducing operation is started, a rotation control operation of the spindle motor is performed by a spindle motor drive circuit (not shown), and a focusing control operation and a tracking control operation of the optical pickup 2 are performed. Is started, and the operation of reading signals 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 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. In such a circuit configuration, when the disk 1 is inserted into the mounting portion of the disk in order to perform a signal recording operation, a laser output setting operation is performed. The operation of setting the laser output is performed by setting the laser output based on reference laser output data previously stored in a memory circuit (not shown) provided in the system control circuit 9, and setting the laser output based on the laser output. After performing an operation of recording a test signal in a test writing area provided on the innermost side of the optical disk 1, a reproducing operation of the recorded test signal is performed, and a laser output changing operation is performed based on the reproduced signal. Are repeated, and when the laser output reaches an optimum laser output value for recording a signal on the disk 1, the processing is terminated. The operation of recording a signal in the data signal recording area provided on the disk 1 is started by the laser output set in this way. When the signal recording operation is being performed, an automatic adjustment circuit is provided. Of the laser output by the laser drive circuit 11 to monitor the change in the light reflected from the disk 1, thereby changing the value of the drive current supplied to the laser diode from the laser drive circuit 11 so that the laser output always becomes optimal for the recording operation. Is performed. As described above, the setting operation of the laser output is performed by the recording / reproducing operation of the test signal in the test writing area, and the laser output set by the setting operation and the signal recording are performed by the adjusting operation of the automatic adjustment circuit of the output. The operation is performed. Next, the recording control which is the gist of the present invention will be described. The setting operation of the laser output is performed by recording the test signal while changing the laser output in the test writing area, and detecting the reproduction level of the recorded signal. The setting operation is performed. At this time, it is detected whether or not the level of the reproduction signal changes in response to the change in the laser output. That is, the reproduction level of the recorded test signal changes in accordance with the change in the laser output. If the change corresponds to the change set in advance, the characteristics of the disc 1 are regulated. It is judged that the disc has the characteristics of the range and the disc can perform the automatic adjustment operation of the laser output by the automatic adjustment circuit, and the recording operation to the data signal recording area is performed by the automatic adjustment circuit. You will do it while you do it. A test signal recorded in the test writing area of the disk 1 is reproduced, and if the level change of the reproduced signal is not a change corresponding to a previously set change, the recording characteristics of the disk 1 are within a specified range. Since the disc does not have characteristics, it is determined that the disc should not be automatically adjusted by the automatic adjustment circuit. Therefore, in this case, the signal recording operation to the data signal recording area provided on the disk 1 is performed without performing the automatic adjustment operation of the laser output by the automatic adjustment circuit, that is, the test signal is written to the test writing area. The operation is performed with the laser output fixed by the recording and reproducing operation. According to the present invention, when a signal is recorded in a data signal recording area provided on a disk, the laser output is recorded based on the amount of light reflected from the disk. In an optical disc recording / reproducing device equipped with an automatic adjustment circuit that automatically adjusts to an output set for performing an operation, a laser signal is output to a test writing area provided on the inner peripheral side of the disc. The test signal recorded in the test writing area is changed according to the change in the laser output by recording the test signal while changing it, reproducing the recorded test signal, detecting the reproduction characteristics of the signal, and setting the laser output. The laser output automatically changes to the preset laser output when the same level change as the preset level change is performed. Since so as to operate the automatic adjustment circuit regulates can perform signal recording operation at optimum conditions on the properties of the disk. [0029]

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. [Description of Signs] 1 Disc 2 Optical pickup 4 RF signal amplification circuit 5 Pickup control circuit 6 Digital signal processing circuit 9 System control circuit 11 Laser drive circuit 12 Laser output control circuit 14 Reflected light amount detection circuit

Continuation of the front page (56) References JP-A-10-228644 (JP, A) JP-A-11-134772 (JP, A) JP-A-9-320057 (JP, A) JP-A-8-45101 (JP, A) JP-A-5-166188 (JP, A) JP-A-3-40236 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7/0013 G11B 7/12-7/22

Claims (1)

(57) [Claim 1] When a signal is recorded in a data signal recording area provided on a disk, a laser output is recorded based on the amount of light reflected from the disk .
In an optical disc recording / reproducing device equipped with an automatic adjustment circuit that automatically adjusts the output to the set output, the test signal is changed to the test writing area provided on the inner circumference and records
Plays back the recorded test signal and adjusts the playback characteristics of that signal.
It performs a setting operation of the laser output by detecting, trial
The playback level of the test signal recorded in the
Preset level in response to changes in
Laser output is set when the same change
Activates an automatic adjustment circuit that automatically adjusts to the laser output
Recording control method of the optical disc recording and reproducing apparatus being characterized in that the so that is.