JP4429220B2 - Laser output setting method for optical disc recording / reproducing apparatus - Google Patents

Description

  The present invention relates to an optical disc recording / reproducing apparatus, and more particularly to a method for setting a laser output suitable for recording a signal on an optical disc.

  An optical disk recording / reproducing apparatus capable of recording a signal on an optical disk with a laser beam emitted from an optical pickup is widespread, and a typical example of such an optical disk recording / reproducing apparatus uses an optical disk called a CD. is there.

  As such an optical disc recording / reproducing apparatus, there is one that uses a write-once type optical disc called CD-R, and such an optical disc has a meandering groove called a pre-groove as is well known. By demodulating the obtained wobble signal, a synchronization signal and position information data (generally called ATIP) indicating a position on the optical disk are obtained.

  In addition, a data signal indicating the manufacturer of the optical disc and the type of the optical disc is recorded on such a recordable optical disc, and the optical disc recording / reproducing apparatus performs the setting operation of the laser output by recognizing such data. Configured to do.

  A test writing area used for setting the laser output is provided on the inner periphery side of the recordable optical disc. In the optical disc recording / reproducing apparatus, the laser output is changed to the test writing area. On the other hand, the test signal is recorded, and the laser output setting operation is performed by detecting the reproduction characteristic of the recorded test signal.

In such an optical disk reproducing apparatus, a laser output value is stored in a memory circuit based on the type of the optical disk, and a laser output setting operation is performed using the disk data stored in the memory circuit. The technology described above has been developed (see, for example, Patent Document 1).
JP 2004-199749 A

  In Patent Document 1, when disk data that matches the type of an optical disk used for recording is stored as table data, the laser data is set using the disk data, and the disk data is stored. If not, a technique is described in which a laser output setting operation is performed using a basic recording pulse signal.

  Recently, even with the same type of optical disc, the disc manufacturer's characteristics change and illegally manufactured optical discs called pirated copies are sold in the market, so the disc data stored in the memory circuit and recording characteristics are greatly different There is an optical disc to play. In such a case, there arises a problem that the laser output setting operation is not normally performed or the laser output setting operation is performed for a long time and the test writing area is lost.

  The present invention seeks to provide a laser output setting method capable of solving such problems.

  The present invention detects the type of the optical disc and the presence or absence of disc data that is the laser output data of the detected optical disc when performing the setting operation of the laser output. If there is disc data, the setting is made based on the disc data. After recording the test signal with the laser output to be detected, the β value of the recorded test signal is detected, and when the detected β value is within the set range, the laser output recording the test signal is used as the laser output for performing the recording operation. When the β value is outside the setting range, the laser output is changed by one step in the direction to correct the β value deviation, the test signal recording operation and the β value detection operation are repeated, and the test is performed by changing the laser output. If the β value does not fall within the set range even though the signal recording operation has been performed a predetermined number of times, a test signal was recorded with the specified laser output. The β value of the recorded test signal is detected, and when the detected β value is within the set range, the laser output recording the test signal is set as the laser output for performing the recording operation, and when the β value is outside the set range, The laser output is set by changing the laser output by one step in the direction of correcting the deviation of the β value and repeatedly performing the test signal recording operation and the β value detecting operation.

  In addition, the present invention detects the type of the optical disk and the presence / absence of the disk data, which is the laser output data of the detected optical disk, when the laser output setting operation is performed. The laser which detects the β value of the recorded test signal after recording the test signal with the set laser output and performs the recording operation when the detected β value is within the set range. Set as output, and when the β value is outside the setting range, change the laser output by one step in the direction to correct the deviation of β value, and repeat the test signal recording operation and β value detection operation to change the laser output If the β value does not fall within the setting range even though the test signal recording operation is performed for the first predetermined number of times, the test signal is output with the specified laser output. After recording, the β value of the recorded test signal is detected, and when the detected β value is within the setting range, the laser output recording the test signal is set as the laser output for performing the recording operation, and the β value is outside the setting range. In this case, the laser output is changed by one step in the direction of correcting the deviation of the β value, the test signal recording operation and the β value detecting operation are repeated, and the test signal recording operation by changing the laser output is performed a second predetermined number of times. If the β value does not fall within the set range even though it has been performed, it is configured to process as an error.

  Then, when there is no disc data, the present invention detects the β value of the recorded test signal after recording the test signal with the laser output of the prescribed value, and when the detected β value is within the set range, the test signal Is set as the laser output to perform the recording operation, and when the β value is out of the setting range, the laser output is changed by one step in the direction to correct the deviation of the β value, and the test signal recording operation and the β value When the β value does not fall within the set range despite the second predetermined number of times of the test signal recording operation by changing the laser output, the detection operation is repeated as an error.

  Further, the present invention is configured to store the output data in the memory circuit as disk data when the laser output is normally set.

  The present invention is configured to clear the disk data stored in the memory circuit when the laser output is not normally set.

The present invention detects the type of the optical disc and the presence or absence of disc data that is the laser output data of the detected optical disc when performing the setting operation of the laser output. If there is disc data, the setting is made based on the disc data. After recording the test signal with the laser output to be detected, the β value of the recorded test signal is detected, and when the detected β value is within the set range, the laser output recording the test signal is used as the laser output for performing the recording operation. When the β value is outside the setting range, the laser output is changed by one step in the direction to correct the β value deviation, the test signal recording operation and the β value detection operation are repeated, and the test is performed by changing the laser output. If the β value does not fall within the set range even though the signal recording operation has been performed a predetermined number of times, a test signal was recorded with the specified laser output. The β value of the recorded test signal is detected, and when the detected β value is within the set range, the laser output recording the test signal is set as the laser output for performing the recording operation, and when the β value is outside the set range, Since the laser output is set by changing the laser output by one step in the direction of correcting the deviation of the β value and repeatedly performing the test signal recording operation and the β value detecting operation, the disc data is different. Can also set the laser output.

  In addition, the present invention detects the type of the optical disk and the presence / absence of the disk data, which is the laser output data of the detected optical disk, when the laser output setting operation is performed. The laser which detects the β value of the recorded test signal after recording the test signal with the set laser output and performs the recording operation when the detected β value is within the set range. Set as output, and when the β value is outside the setting range, change the laser output by one step in the direction to correct the deviation of β value, and repeat the test signal recording operation and β value detection operation to change the laser output If the β value does not fall within the setting range even though the test signal recording operation is performed for the first predetermined number of times, the test signal is output with the specified laser output. After recording, the β value of the recorded test signal is detected, and when the detected β value is within the setting range, the laser output recording the test signal is set as the laser output for performing the recording operation, and the β value is outside the setting range. In this case, the laser output is changed by one step in the direction of correcting the deviation of the β value, the test signal recording operation and the β value detecting operation are repeated, and the test signal recording operation by changing the laser output is performed a second predetermined number of times. If the β value does not fall within the set range even though it has been performed, it is processed as an error, so that the test signal recording operation can be prevented from being performed for a long time.

  Then, when there is no disc data, the present invention detects the β value of the recorded test signal after recording the test signal with the laser output of the prescribed value, and when the detected β value is within the set range, the test signal Is set as the laser output to perform the recording operation, and when the β value is out of the setting range, the laser output is changed by one step in the direction to correct the deviation of the β value, and the test signal recording operation and the β value In this case, when the β value does not fall within the set range even though the test signal recording operation by changing the laser output is performed for the second predetermined number of times, it is processed as an error. Thus, it is possible to quickly set the laser output when the type of the optical disk cannot be recognized.

  Further, according to the present invention, when the setting operation of the laser output is normally performed, the output data is stored in the memory circuit as the disk data, so that the laser can be accurately and promptly performed when the next recording operation is performed. Output setting operation can be performed.

  In the present invention, when the laser output setting operation is not performed normally, the disk data stored in the memory circuit is cleared. The disk data is not used, and the laser output setting operation can be performed without performing unnecessary operations.

  The present invention relates to a method for performing a laser output setting operation using a test writing area provided on the inner peripheral side of a recording optical disk.

FIG. 1 is a flowchart showing a laser output setting method of the present invention, FIG. 2 is a block circuit diagram showing an embodiment of an optical disk apparatus according to the present invention, and FIG. 3 is a signal waveform diagram for explaining the operation of the present invention. .

  In FIG. 2, reference numeral 1 denotes an optical disk that is mounted on a turntable 3 that is rotationally driven by a spindle motor 2, and 4 is an optical disk 1 that incorporates a laser diode 5 that irradiates the optical disk 1 with laser light. Is an optical pickup incorporating a light detector 6 that receives laser light reflected from the signal surface of the optical disc 1, and includes a tracking coil 8 that biases the objective lens 7 in the tracking direction and the objective lens 7 in the signal surface direction of the optical disc 1. A focus coil 9 is provided to be displaced to the right, and the main body of the optical pickup 4 is displaced in the radial direction of the optical disc 1 by a rotating operation of a sled motor (not shown).

  Reference numeral 10 denotes a front-end processing circuit to which a signal obtained from the photodetector 6 incorporated in the optical pickup 4 is input, and generates and outputs a binarized signal, a high-frequency signal, a tracking error signal, and a focus error signal. It is configured as follows. Since the signal processing operation by such a front-end processing circuit can be performed by a known circuit, description thereof is omitted.

  A pickup control circuit 11 receives a tracking error signal and a focus error signal output from the front-end processing circuit 10 and outputs a signal for controlling the optical pickup 4 based on each signal. A signal, a focus control signal, and a sled motor control signal are output by a servo circuit for each operation.

  Reference numeral 12 denotes a tracking coil drive circuit that receives a tracking control signal output from the pickup control circuit 11 and supplies a tracking coil drive signal corresponding to the signal to the tracking coil 8. Reference numeral 13 denotes an output from the pickup control circuit 11. The focus coil drive circuit supplies a focus coil drive signal corresponding to the received focus control signal to the focus coil 9.

  Reference numeral 14 denotes a binary signal output from the front-end processing circuit 10, that is, a digital signal processing circuit to which a digital signal is input. By performing a digital signal processing operation, a reproduction signal, a synchronization signal, position information data, etc. A demodulation operation is performed.

  Reference numeral 15 denotes a β value detection circuit to which a high frequency signal output from the front end processing circuit 10 is input, and is configured to detect a β value from the level of the high frequency signal. FIG. 3 is a waveform diagram of a signal obtained when a signal recorded on the optical disc 1 is reproduced. A1 and A2 are a positive peak level and a negative peak level of the high-frequency signal. Under such conditions, the β value is expressed as β = (A1 + A2) / (A1−A2). When the β value is a predetermined value, it is determined that the signal recorded on the optical disc 1 conforms to the standard. Therefore, the quality of the laser output for performing the recording operation can be determined by detecting this β value.

  Reference numeral 16 denotes a system control circuit for performing various control operations based on program software stored in a memory element (not shown) such as a flash ROM. Various signals demodulated by the digital signal processing circuit 14 and A control operation based on a signal obtained from the β value detection circuit 15 is performed.

Reference numeral 17 denotes a recording signal processing circuit to which a recording signal output from a computer device (not shown) as a host is input via an interface circuit (not shown). A combined modulation processing operation is performed. Reference numeral 18 denotes a recording pulse generation circuit which receives the recording signal modulated by the recording signal processing circuit 17 and generates a recording pulse signal corresponding to the recording signal. In the case of a CD standard disc, 3T to 11T. It is configured to generate a pulse signal for forming a pit having a length of.

  Reference numeral 19 denotes a laser drive circuit to which a recording pulse signal output from the recording pulse generation circuit 18 is input. The laser drive circuit 19 supplies a drive signal having a waveform corresponding to the input pulse signal to the laser diode 5 and outputs it. The level is configured to be set by the system control circuit 16.

  A spindle motor drive circuit 20 rotates the spindle motor 2 and synchronizes a synchronization signal obtained from the optical disk 1 with a reference synchronization signal generated from a reference clock signal generation circuit (not shown). Is driven to rotate at a constant linear velocity. Then, by controlling the frequency of the reference synchronization signal, the linear velocity can be rotationally driven at a constant linear velocity such as 8 times and 12 times the specified linear velocity.

  Reference numeral 21 denotes a disk data memory circuit in which laser output data corresponding to the type and recording speed of the optical disk 1 is stored as disk data. The system control circuit 16 controls the data storage operation, the clear operation, and the like. It is configured.

  As described above, the optical disk recording / reproducing apparatus according to the present invention is configured. Next, the operation will be described. The reproduction operation of the signal recorded on the optical disc 1 includes a focus control operation for rotating the optical disc 1 at a desired rotational speed and focusing the laser beam on the signal surface, and a tracking control operation for causing the laser beam to follow the signal track. It is performed in the state where has been performed.

  The focus control operation for focusing the laser beam on the signal surface of the optical disc 1 is a servo operation based on the focus error signal generated from the front-end processing circuit 10 by the focus servo circuit incorporated in the pickup control circuit 11. Therefore, the focus coil drive signal generated based on the control signal is supplied from the focus coil drive circuit 13 to the focus coil 9.

  The tracking control operation for causing the laser beam to follow the signal track of the optical disc 1 is a servo operation by a tracking servo circuit incorporated in the pickup control circuit 11 based on a tracking error signal generated from the front-end processing circuit 10. And a tracking coil drive signal based on the control signal is supplied from the tracking coil drive circuit 12 to the tracking coil 5.

  The tracking control operation for causing the laser beam to follow the signal track of the optical disc 1 is performed by supplying a tracking coil drive signal to the tracking coil 8, and this operation is performed by biasing the objective lens 7. When the deflection amount of the objective lens 7 reaches a predetermined amount, that is, when it becomes impossible to perform a further deflection operation, the moving operation of the optical pickup 4 main body by the sled motor is performed.

  By performing the above-described focus control operation and tracking control operation, a reproduction operation of a signal recorded on the optical disc 1 is performed. Such a reproduction operation is recorded by a signal recorded on the optical disc 1, that is, a pit. It is performed on the signal.

  A reproduction signal read based on the pits recorded on the optical disc 1 is output as a digital signal from the front end processing circuit 10 and input to the digital signal processing circuit 14. A signal reproduced based on the pit includes a synchronization signal, and the synchronization signal is extracted by a demodulation operation by the digital signal processing circuit 14.

  A clock signal for demodulating the reproduction signal is generated using the extracted synchronization signal, and the synchronization signal is used for the rotation control operation of the spindle motor 2. That is, the optical disk 1 can be rotated at a constant linear speed by controlling the rotation speed of the spindle motor 2 so that the synchronization signal and the reference synchronization signal are synchronized.

  In such a state, the reproduction operation of the signal recorded on the optical disk 1 is performed, and the reproduction signal is processed by the digital signal processing circuit 13 and then output to a computer device or the like.

  Although the reproducing operation is performed as described above, the recording operation will be described next. The tracking control operation, the focus control operation, and the control operation for the sled motor in the optical pickup 4 are performed in the same manner as in the reproduction operation. As is well known, the extraction operation of the synchronization signal recorded on the optical disc 1 and the extraction operation of the position information data used in the recording operation are obtained from a meandering groove called a pregroove formed on the optical disc 1. The wobble signal is generated.

  The wobble signal generated from the front-end processing circuit 10 is input to a wobble decoding circuit (not shown), and a synchronization signal and position information data are extracted by a demodulation operation by the wobble decoding circuit. The rotation control operation of the spindle motor when recording a signal on the optical disc 1 is performed using a synchronization signal extracted from the wobble signal, and a recording clock signal is also generated based on the synchronization signal.

  As described above, the signal processing operation is performed by the recording signal processing circuit 17 provided to perform the modulation processing operation of the recording signal by the recording clock signal generated based on the synchronization signal extracted from the wobble signal. The recording signal input to the recording signal processing circuit 17 is subjected to a modulation processing operation in accordance with the signal standard and input to the recording pulse generation circuit 18.

  When such a recording signal is input to the recording pulse generation circuit 18, the recording pulse generation circuit 18 generates a pulse signal corresponding to the recording signal, that is, a pulse signal having a length of 3T to 11T. A corresponding drive signal is supplied from the laser drive circuit 19 to the laser diode 5. When such a drive signal is supplied to the laser diode 5, the laser light emitted from the laser diode 5 is applied to the signal track of the optical disc 1, so that the signal is recorded by forming pits on the optical disc 1. I can do it.

  As described above, the signal reproducing operation and the signal recording operation in this embodiment are performed. Next, the laser output setting method, which is the gist of the present invention, will be described with reference to the flowchart shown in FIG. .

  The laser output setting operation is performed using the test writing area provided in the optical disc 1 before performing the signal recording operation in the signal recording area provided in the optical disc 1. This is performed based on a command signal output from the apparatus. The laser output setting operation is performed for the signal recording speed to be performed.

When a command signal for setting the laser output corresponding to the recording characteristics and recording speed of the optical disc 1 used from the computer device is output to the optical disc recording / reproducing apparatus, the laser output setting operation is started (step) A). When such an operation is started, first, the data indicating the type of the disc recorded on the optical disc 1 is read to recognize the type of the optical disc 1, and the data for the disc, that is, the type of the optical disc 1 and the recording speed. An operation for detecting whether or not the corresponding disk data is stored in the disk data memory circuit 21 is performed (step B).

  When the operation of detecting whether or not the disk data is recorded in the disk data memory circuit 21 is performed, a process for determining whether or not there is disk data is performed (step C). If it is determined in step C that the optical disk 1 to be used is an optical disk that matches the data stored in the disk data memory circuit 21, a test write area is tested by a laser output set based on the disk data. The signal is recorded, the recorded test signal is reproduced, and the β value is detected (step D).

  Such an operation of Step D includes an operation of moving the optical pickup 4 to the test writing area based on the position information data read from the optical disc 1, a test signal generated by a control operation of the system control circuit 16, and a recording signal processing circuit. The modulation operation by 17 and the pulse generation operation by the recording pulse generation circuit 18 are performed, and a pulse signal for recording is supplied from the laser driving circuit 19 to the laser diode 5. In this case, the laser output is the disk data memory circuit 21. Is set based on the output data stored in.

  The test signal is recorded in the trial writing area by such laser output for a predetermined time. When the recording operation is completed, the recorded test signal is reproduced and the β value detecting circuit 15 detects the β value. Done. Such β value detection operation is performed by detecting the positive peak level A1 and the negative peak level A2 of the high-frequency signal output from the front-end processing circuit 10 and performing arithmetic processing on these level values. .

  When the β value is detected by such an operation, it is determined whether or not the detected β value is within a set range, for example, within ± 0.5% with respect to the value specified in the signal recording standard. (Step E). When it is determined in step E that the β value is within the set range, that is, when it is determined that the value is within the allowable range with respect to the value specified in the signal recording standard, the laser that has recorded the test signal An operation is performed in which the output is determined as a laser output set for actually recording a signal, and data corresponding to the value is stored in the disk data memory circuit 21 as disk data (step F). In this case, since the laser output set based on the disk data stored in the disk data memory circuit 21 is the same as the laser output for recording the signal, it is stored in the disk data memory circuit 21 as disk data. It is not necessary to update, but it can be arbitrarily determined whether or not to update.

  When it is determined by the determination operation in step E that the β value is not within the set range, an operation is performed to increase the count number of the first counter circuit 22 provided in the system control circuit 16 or the like by 1 ( Step G). When the count number of the first counter circuit 22 increases by 1, it is determined whether or not the count number is a set number (step H). The number counted by the first counter circuit 22 is the number of times that the test signal recording operation and the β value detection operation are performed by the laser output set based on the disk data stored in the disk data memory circuit 21. In this case, the set number is, for example, five as the first predetermined number of times.

If it is determined in step H that it is not the set count number, the laser output is changed by one step in the direction of correcting the deviation of the detected β value from the specified value, and the test signal is recorded and recorded. A test signal reproduction operation is performed to detect a β value (step I). In such a case, the operation of changing the laser output is performed by increasing or decreasing, for example, by 2 mW.

  When the operation of Step I is performed, the process returns to Step E to determine whether or not the β value is within the set range. If it is determined in step E that the β value is within the set range, the operation of step F, that is, the laser output value obtained by increasing or decreasing the laser output value stored in the disk data memory circuit 21 by 2 mW is signaled. Is determined as a laser output suitable for recording and the changed laser output value is stored in the disk data memory circuit 21.

  If it is determined by the determination operation in step E that the β value is within the set range, the processing operation in step F can be performed to start the signal recording operation on the optical disc 1. If it is determined by the determination operation that the β value is not within the set range, the processing operation from Step G described above is performed.

  The test signal is recorded by changing the laser output step by step, and the β value is within the set range even though the β value of the recorded test signal is detected five times which is the first predetermined number of times. If not, it is determined in step H that the count has reached the set number.

  If it is determined in step H that the count number has reached the set number, it is determined that the recording characteristics of the optical disc 1 are significantly different from the disc data stored in the disc data memory circuit 21. In this case, the laser output is set to a specified value, that is, a value set as an average value of various recording disks, a test signal is recorded in the test writing area by the laser output, and the recorded test signal is recorded. The reproducing operation is performed to detect the β value (step J).

  When the β value is detected by such an operation, the detected β value is within a set range with respect to the value specified by the signal recording standard, for example, ± 0.5, as in the processing operation of Step E described above. It is determined whether it is within% (step K). When it is determined in step K that the β value is within the set range, that is, when it is determined that the value is within the allowable range with respect to the value specified in the signal recording standard, the laser that has recorded the test signal An operation is performed in which the output is determined as a laser output set to actually record a signal and data corresponding to the value is stored in the disk data memory circuit 21 as disk data (step L).

  When it is determined by the determination operation in step K that the β value is not within the set range, an operation of increasing the count number of the second counter circuit 23 provided in the system control circuit 16 or the like by 1 is performed ( Step M). When the count number of the second counter circuit 23 increases by 1, it is determined whether or not the count number is a set number (step N). The number counted by the second counter circuit 23 indicates the number of times the test signal recording operation and the β value detection operation are performed by the laser output set based on the specified value. In this case, the set number Is, for example, 8 times as the second predetermined number of times.

  If it is determined in step N that it is not the set count number, the laser output is changed by one step in the direction of correcting the deviation of the detected β value from the specified value, and the test signal is recorded and recorded. A test signal reproduction operation is performed to detect a β value (step O). In such a case, the operation of changing the laser output is performed by increasing or decreasing, for example, by 2 mW.

When the operation of step O is performed, the process returns to step K and a determination operation is performed as to whether or not the β value is within the set range. If it is determined in step K that the β value is within the set range, the operation of step L, that is, the laser output value obtained by increasing or decreasing the laser output value by 2 mW from the specified value is suitable for recording a signal. An operation of storing the determined laser output value in the disk data memory circuit 21 is performed while being determined as the laser output.

  If it is determined by the determination operation in step K that the β value is within the set range, the processing operation in step L is performed, and the recording operation of the signal onto the optical disc 1 can be started. If it is determined that the β value is not within the set range, the processing operation from Step M described above is performed.

  The test value is recorded by changing the laser output one step at a time from the specified value, and the β value is within the set range even though the β value of the recorded test signal is detected eight times as the second predetermined number of times. If not, in step N, it is determined that the count number has reached the set number.

  If it is determined in step N that the count number has reached the set number, the recording characteristics of the optical disc 1 are not only significantly different from the disc data stored in the disc data memory circuit 21 but also the prescribed value. Therefore, it is determined that the disk cannot perform the setting operation of the laser output even if the operation of changing the laser output based on the laser output is performed. In this case, the optical disc recording / reproducing apparatus performs an error process and clears the disc data stored in the disc data memory circuit 21 (step P). That is, when such a clear processing operation is performed, the data relating to the laser output based on the type of the optical disk 1 is erased from the disk data memory circuit 21.

  The operation in the case where it is determined by the processing operation in step C that the optical disc 1 is a disc that matches the optical disc type and laser output data stored in the disc data memory circuit 21 is performed as described above. The operation when it is determined by the operation in step C that the disc has no disc data will be described.

  If it is determined in step C that there is no data, the operation from step J described above is started. That is, in this case, since it is determined that the optical disc 1 is a disc without disc data, a test signal recording operation and a β value detection operation are performed on the basis of a prescribed value laser output. It will be. When the above-described operation is performed and the β value falls within a predetermined range, the operation of step L, that is, the operation of determining the laser output and the operation of storing the disk data in the disk data memory circuit 21 are performed.

  If the β value does not fall within the predetermined range despite the fact that the test signal recording operation and the β value detecting operation are performed by changing the laser output eight times, which is the second predetermined number of times, a step is performed. The processing operation of P, that is, the error processing and the operation of clearing the disk data stored in the disk data memory circuit 21 are performed. In this case, since the corresponding disk data is not stored in the disk data memory circuit 21, the clear operation is not performed. The processing operation for determining whether or not to perform the clear operation on the disk data memory circuit 21 in such a case can be easily selected by setting a process called a flag in the program when performing the processing operation of Step C. I can do it.

In the present embodiment, the first predetermined number counted by the first counter circuit 22 is five times and the second predetermined number counted by the second counter circuit 23 is eight, but the number is limited. Is not to be done. The reason why the first predetermined number is smaller than the second predetermined number is that the first predetermined number of times is the optical disk 1 in which the disk data is stored in the disk data memory circuit 21.
This is because there is a high possibility that the β value falls within the setting range with a small number of times.

It is a flowchart which shows the laser output setting method of this invention. 1 is a block circuit diagram showing an embodiment of an optical disc recording / reproducing apparatus according to the present invention. It is a signal waveform diagram for demonstrating operation | movement of this invention.

Explanation of symbols

1 Optical disc
2 Spindle motor
4 Optical pickup
5 Laser diode
6 Photodetector 10 Front-end processing circuit 14 Digital signal processing circuit 15 β value detection circuit 16 System control circuit 17 Recording signal processing circuit 18 Recording pulse generation circuit 19 Laser driving circuit 20 Spindle motor driving circuit 21 Disk data memory circuit 22 First Counter circuit 23 Second counter circuit

Claims (5)

A laser output setting method for an optical disc recording / reproducing apparatus configured to record a test signal in a test writing area provided on an inner peripheral side of an optical disc and to set a laser output based on characteristics of the recorded test signal. Yes, when performing the laser output setting operation, the type of the optical disk is detected and the presence / absence of the disk data, which is the laser output data of the detected optical disk, is detected, and if there is disk data, it is set based on the disk data After recording the test signal with the laser output, the β value of the recorded test signal is detected, and when the detected β value is within the setting range, the laser output recording the test signal is set as the laser output for performing the recording operation. When the β value is outside the setting range, the laser output is changed by one step in the direction to correct the β value deviation. If the β value does not fall within the set range even though the test signal recording operation by changing the laser output is repeated a predetermined number of times, the recording value is recorded and the β value is detected. After the test signal is recorded, the β value of the recorded test signal is detected, and when the detected β value is within a set range, the laser output recording the test signal is set as the laser output for performing the recording operation, and the β value When is outside the setting range, the laser output is set by changing the laser output by one step in the direction to correct the deviation of the β value and repeatedly performing the test signal recording operation and the β value detecting operation. A laser output setting method for an optical disc recording / reproducing apparatus. A laser output setting method for an optical disc recording / reproducing apparatus configured to record a test signal in a test writing area provided on an inner peripheral side of an optical disc and to set a laser output based on characteristics of the recorded test signal. Yes, when performing the laser output setting operation, the type of the optical disk is detected and the presence / absence of the disk data, which is the laser output data of the detected optical disk, is detected, and if there is disk data, it is set based on the disk data After recording the test signal with the laser output, the β value of the recorded test signal is detected, and when the detected β value is within the setting range, the laser output recording the test signal is set as the laser output for performing the recording operation. When the β value is outside the setting range, the laser output is changed by one step in the direction to correct the β value deviation. If the β value does not fall within the set range even though the test signal recording operation by changing the laser output is performed for the first predetermined number of times, the recording value recording operation and β value detection operation are repeated. After recording the test signal at the output, the β value of the recorded test signal is detected, and when the detected β value is within the setting range, the laser output recording the test signal is set as the laser output for performing the recording operation, When the β value is outside the set range, the laser output is changed by one step in the direction to correct the deviation of the β value, the test signal recording operation and the β value detection operation are repeated, and the test signal is recorded by changing the laser output. A laser output setting method for an optical disc recording / reproducing apparatus, wherein an error is processed when a β value does not fall within a set range even though the operation has been performed a second predetermined number of times. When there is no disc data, the test signal is recorded with the specified laser output and then the β value of the recorded test signal is detected. When the detected β value is within the set range, the laser output that records the test signal is detected. Set as laser output to perform recording operation. When β value is outside the setting range, change laser output by one step in the direction to correct the deviation of β value, and repeat test signal recording operation and β value detection operation. 3. The method according to claim 2, wherein if the β value does not fall within the set range even though the test signal recording operation by changing the laser output is performed a second predetermined number of times, it is processed as an error. Laser power setting method. 3. The laser output setting method according to claim 1, wherein when the laser output is normally set, the output data is stored in the memory circuit as disk data. 3. The laser output setting method according to claim 2, wherein when the laser output is not normally set, the disk data stored in the memory circuit is cleared.

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