JP2005251288A - Recording control method for optical disk recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording control method for an optical recording device, capable of recording a signal in a disk by an optical pickup. <P>SOLUTION: This recording control method for an optical recording device is capable of recording a signal in the state of a prescribed constant linear velocity or a constant linear velocity higher than the prescribed speed. During the recording operation at the high constant linear velocity, the level of a laser beam reflected by the disk is detected, and the recording linear velocity is reduced when the change of the detected level exceeds a predetermined value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording control method for an optical disc recording apparatus configured to record a signal on a disc by laser light emitted from an optical pickup.

  An optical disc recording apparatus configured to record a signal on a disc by laser light emitted from an optical pickup has been commercialized. A recording disk used in such an optical disk recording apparatus is provided with a groove called a pregroove, and time information, that is, address data can be obtained by demodulating a wobble signal obtained from the pregroove. It is configured to be able to. The optical disk recording apparatus is configured to generate address data based on the address data obtained from the disk, and record the signal on the disk by performing an encoding process for adding the address data to the recording signal.

  The optical disk recording apparatus is configured to perform a focus control operation and a tracking control operation because it is necessary to accurately irradiate the laser beam irradiated from the optical pickup onto the signal track on the disk surface. Such focus control operation is performed by supplying a driving current to a focusing coil that displaces the objective lens in a direction perpendicular to the disk surface, and the tracking control operation is performed by a tracking coil that displaces the objective lens in the radial direction of the disk. This is done by supplying a drive current to.

  Further, since the optical disk recording apparatus is required to perform the recording operation on the disk in a short time, not only the recording operation is performed by rotating the disk while keeping the specified linear velocity constant. The recording operation can be performed by rotating the disk at a constant linear velocity such as 4 times, 8 times and 12 times the linear velocity.

  The recording operation on the disc in the optical disc recording apparatus is performed in a state where the disc is rotated at a constant linear velocity. When the disc is rotated at a constant linear velocity, the inner side of the disc is rotated. However, the rotational angular velocity of the disk is higher than that on the outer peripheral side. Therefore, it is difficult to rotate the disk from the inner periphery side to the outer periphery side at the same constant high linear velocity.

  As a method for solving such a problem, the linear velocity is changed to a high velocity as the recording position moves from the inner circumference side to the outer circumference side of the disc, that is, when the recording position moves to a position where the recording linear velocity can be increased. A technique called so-called ZONE-CLV has been developed (see, for example, Patent Document 1).

  In addition, when performing the signal recording operation by rotating the disk at a high linear velocity constant state, it is necessary to keep the disk rotation characteristics in a good state. If there is, the rotational characteristics of the disk will deteriorate. If the rotational characteristics of the disk deteriorate, it becomes difficult to accurately perform the focusing control operation and tracking control operation of the optical pickup, and there is a problem that the signal recording operation to the disk cannot be performed accurately. As a method for solving such a problem, a method of detecting the level of the focus error signal during the recording operation and reducing the rotational speed of the disc when the level becomes large is employed (for example, see Patent Document 2).

The optical disk recording device used in connection with the computer device solves a problem called buffer underrun error that occurs when the transfer amount of the data signal sent from the computer device is insufficient with respect to the recording speed of the disk. Technology has been developed. In such a technique, when the buffer underrun state is reached, the recording operation of the signal to the disk is temporarily interrupted, and when the data signal that is the recording signal becomes an amount capable of performing the recording operation, the recording is started from the recording interruption position. The operation is resumed (see, for example, Patent Document 3).
JP 2002-358642 A JP 2004-5817 A Japanese Patent Laid-Open No. 10-49990

  The method of reducing the recording rotation speed of the disc by judging that the recording operation to the disc cannot be performed accurately by detecting the level change of the focus error signal and the tracking error signal is the same as that of the mechanical error of the disc. However, it can not cope with the disc recording characteristics of discs.

  The recording characteristics of the disc are not uniform in the entire recording area, and there are portions where the characteristics are different. In such a case, the recording laser output does not match the recording characteristics of the disc at that position, and the signal recording There is a problem that the characteristics cannot be performed normally.

  The present invention is intended to provide a recording control method for an optical disk recording apparatus that can solve such a problem.

  The present invention is a recording control method of an optical disc recording apparatus capable of performing a signal recording operation in a state where the disc is rotated in a state where the disc is rotated at a constant linear velocity constant and a linear velocity higher than the prescribed linear velocity, It is configured to detect the level of laser light reflected from the disk when recording operation is performed at a constant high linear velocity, and to reduce the recording linear velocity when the change in the detected level exceeds a predetermined value. Yes.

  The present invention also relates to a recording control method for an optical disc recording apparatus capable of performing a signal recording operation by changing the recording linear velocity stepwise from the inner circumference side to the outer circumference side in a stepwise manner. Yes, when the recording operation is performed with the recording speed changed to a high linear velocity due to the movement of the recording position to the outer periphery, the level of the laser beam reflected from the disk is detected, and the detected level The recording linear velocity is lowered when the change exceeds a predetermined value.

  The present invention detects the level change of the laser beam reflected from the disk during the recording operation, and reduces the recording linear velocity when the detected level change exceeds a predetermined value. Even if there is a defect in the recording, the recording operation can be performed normally.

  In the present invention, the level detection operation of the laser beam reflected from the disc is performed while the laser output is at the recording level, that is, the reflection level of the laser beam used for recording on the disc is detected. As a result, it is possible to reliably recognize the deterioration of the recording characteristics.

  The present invention detects the level change of the laser beam reflected from the disk surface during the recording operation of the signal to the disk, and performs the operation of determining whether or not to reduce the recording speed based on the detected level change.

  FIG. 1 is a circuit diagram showing an embodiment of an optical disk recording apparatus according to the present invention, and FIG. 2 is a waveform diagram for explaining the operation of the present invention.

  In FIG. 1, reference numeral 1 denotes a disk that is rotationally driven by a spindle motor 2. Position information data is recorded in a groove called a pregroove, and a signal recording operation is performed based on a wobble signal obtained from the groove. It is configured as follows.

  Reference numeral 3 denotes a laser diode 4 that emits laser light emitted to the disk 1 and a monitoring diode (not shown) that monitors the level of the laser light emitted from the laser diode 4 and is incorporated in the disk 1. An optical pickup incorporating a photodetector 5 that receives laser light reflected from the signal surface, and is configured to be moved in the radial direction of the disk 1 by a pickup feed motor (not shown). .

  The optical pickup 3 includes a focusing coil 6 for displacing an objective lens (not shown) in a direction perpendicular to the signal surface of the disk 1 and a tracking coil 7 for displacing the objective lens in the radial direction of the disk 1. It has been incorporated.

  Reference numeral 8 denotes an RF signal amplifying circuit which receives a signal obtained from the photodetector 5 incorporated in the optical pickup 3 and amplifies the signal, and shapes the RF signal and binarizes the signal. It is configured to output. Reference numeral 9 denotes a focusing control operation for focusing the laser light emitted from the laser diode 4 on the signal surface of the disk 1 based on the focus error signal and the tracking error signal generated from the signal obtained from the photodetector 5, and the laser. A pickup control circuit that performs a tracking control operation for causing light to follow a signal track, and is configured to output a focusing control signal based on a focus error signal and a tracking control signal based on a tracking error signal.

  Reference numeral 10 denotes a focusing coil drive circuit to which a focusing control signal output from the pickup control circuit 9 is input, and is configured to supply a driving signal to the focusing coil 6 incorporated in the optical pickup 3. . Reference numeral 11 denotes a tracking coil driving circuit to which a tracking control signal output from the pickup control circuit 9 is input, and is configured to supply a driving signal to the tracking coil 7 incorporated in the optical pickup 3. .

  Reference numeral 12 denotes a digital signal processing circuit that receives the binarized signal output from the RF signal amplifying circuit 8 and performs a processing operation on the signal, and is configured to perform a demodulation processing operation on various signals. Reference numeral 13 denotes a system control circuit that receives the signal demodulated by the digital signal processing circuit 12 and controls each operation of the optical disk recording apparatus based on the input signal. The system control circuit 13 is provided outside via the interface circuit 14. Connected to a host device such as a computer device.

Reference numeral 15 denotes a laser driving circuit for supplying a recording pulse signal to the laser diode 4 incorporated in the optical pickup 3, and during recording operation, the pulse signal as shown in FIG. 2, that is, a recording output VR and a reproduction output. A pulse signal composed of VP is output. Reference numeral 16 denotes a signal recording circuit that encodes a recording signal input through the interface circuit 14 in accordance with the recording standard of the disc 1 so that the encoded recording signal is output to the laser driving circuit 15. It is configured.

  Reference numeral 17 denotes a synchronization signal generation circuit that generates a synchronization signal based on a synchronization signal extracted from a wobble signal obtained from a pregroove formed on the disk 1, and 18 generates a signal that serves as a reference for the rotational linear velocity of the disk 1. A reference signal generation circuit configured to generate a reference clock signal corresponding to each linear velocity set based on a control operation by the system control circuit 13. Reference numeral 19 denotes a spindle motor drive circuit that supplies a signal for rotationally driving the spindle motor 2 so that the synchronization signal output from the synchronization signal generation circuit 17 and the reference signal output from the reference signal generation circuit 18 are synchronized. The spindle motor 2 is rotationally driven and controlled.

  Reference numeral 20 denotes a signal input through the RF signal amplifier circuit 8, that is, a signal corresponding to the level of the laser beam reflected from the signal surface of the disk 1, and a drive signal for the recording output VR from the laser drive circuit 15. This is a sampling circuit that samples a signal obtained during a period supplied to the laser diode 4, and is configured to sample a signal in a recording output period as shown in FIG. Reference numeral 21 denotes a reflected light level detection circuit that receives the signal sampled by the sampling circuit 20 and detects the level of the input signal.

  Reference numeral 22 denotes a buffer RAM for storing a data signal which is a recording signal input through the interface circuit 14, and is configured such that a signal storing operation and a reading operation are controlled by the system control circuit 13. The read operation of the recording signal from the buffer RAM 22 is performed corresponding to the recording operation to the disk 1.

  Further, when the amount of the recording signal stored in the buffer RAM 22 is reduced to an amount where the recording operation cannot be continued during the recording operation to the disk 1, that is, when the buffer underrun state is entered. When the recording operation on the disk 1 is temporarily interrupted and the amount of recording signals increases, the recording operation can be resumed from the position where the recording operation was interrupted. As a technique for performing such an operation, a known technique may be used, and the details thereof are omitted.

  As described above, the optical disk recording apparatus according to the present invention is configured. However, the rotational drive control operation of the spindle motor 2 by the spindle motor drive circuit 19 is not limited to a specified linear velocity, but also has a specified linear velocity. Drive control is performed so that the linear velocity is constant at 4 times, 8 times, and 12 times. The frequency of the clock signal or the like for controlling the operation of the digital signal processing circuit 12, the signal recording circuit 16 or the like is changed corresponding to each recording linear velocity. The operation of setting the laser output suitable for the recording characteristics of the disc 1 is performed by recording a test signal in the test writing area provided on the inner peripheral side of the disc 1 while changing the laser output, and then recording the recorded signal. The laser output that records the signal with the best reproduction characteristics is set as the optimum laser output. The laser output set in this way becomes the recording output VR, and such a value is set corresponding to the recording speed of the disc 1.

Further, a pulse signal as shown in FIG. 2 is output from the laser driving circuit 15, and the system control circuit 13 recognizes a period during which the recording output VR is output in the pulse signal, and according to the period. 2 is applied to the sampling circuit 20, and a signal obtained during that time is output to the reflected light level detection circuit 21. The level detected by the reflected light level detection circuit 21 is recognized by the system control circuit 13, and the value is stored in a memory circuit (not shown) incorporated in the system control circuit 13. It is configured.

  As described above, the optical disk recording apparatus according to the present invention is configured. Next, the operation will be described. In a state where a normal recording operation and reproduction operation are performed, a focus error signal and a tracking error signal are generated from a signal obtained from the photodetector 5 incorporated in the optical pickup 3, and based on the error signal. A control operation for performing the focusing control operation and the tracking control operation is performed by the pickup control circuit 9.

  When a control operation for performing each operation by the pickup control circuit 9 is performed, a control signal is output from the pickup control circuit 9 to the focusing coil drive circuit 10 and the tracking coil drive circuit 11. As a result, a driving signal is supplied from the focusing coil driving circuit 10 and the tracking coil driving circuit 11 to the focusing coil 6 and the tracking coil 7. As a result of such an operation, a focusing control operation for focusing the laser light emitted from the optical pickup 3 on the signal surface on the disk 1 and a tracking control operation for following the signal track can be performed.

  As described above, the focusing control operation and the tracking control operation by the pickup control circuit 9 are performed. Next, the rotation driving operation of the spindle motor 2 by the spindle motor driving circuit 19 will be described.

  The rotation driving operation of the spindle motor 2 is performed by the spindle motor driving circuit 19. The rotation control operation by the spindle motor driving circuit 19 is performed from the synchronization signal output from the synchronization signal generation circuit 17 and the reference signal generation circuit 18. This is performed by synchronizing the output reference clock signal. The frequency of the reference clock signal generated by the reference signal generation circuit 18 is set corresponding to a recording speed set based on a recording command signal output from a computer device provided outside.

  When a command signal for performing a recording operation at a constant linear velocity 12 times the specified linear velocity is output from the computer device, the linear velocity 12 times the prescribed linear velocity is supplied from the system control circuit 13 to the reference signal generating circuit 18. A switching control signal for generating a reference clock signal for performing a constant rotation control operation is output. As a result of such a control signal being input, a 12-fold reference clock signal is output from the reference signal generation circuit 18.

  On the other hand, the spindle motor 2 is rotationally driven by a drive signal output from the spindle motor drive circuit 19 at a predetermined rotational speed, that is, a rotational speed that makes the linear speed on the inner peripheral side of the disk 1 12 times the linear speed. When such an operation is performed, the above-described focusing control operation and tracking control operation for the optical pickup 3 are performed, and the synchronization signal recorded in the pregroove formed on the disk 1 is reproduced as a wobble signal. . Such a synchronization signal is extracted by the digital signal processing circuit 12, and a synchronization signal is generated from the synchronization signal generation circuit 17 based on the extracted synchronization signal.

When the reference clock signal output from the reference signal generation circuit 18 and the synchronization signal output from the synchronization signal generation circuit 17 are input to the spindle motor drive circuit 19, the spindle motor drive circuit 19 A signal for rotating the spindle motor 2 is output so that the synchronization signal output from the synchronization signal generation circuit 17 is synchronized based on the synchronization signal reproduced from 1. As a result of such a drive signal being supplied from the spindle motor drive circuit 19 to the spindle motor 2, the disk 1 is rotationally driven at a constant linear velocity whose rotational linear velocity is 12 times the specified linear velocity.

  The above-described rotational drive control operation of the disk 1 is performed by changing the frequency of the reference clock signal output from the reference signal generation circuit 18 in accordance with each recording linear velocity.

  As described above, the focusing control operation, the tracking control operation, and the rotation drive control operation of the spindle motor 2 of the optical pickup 3 are performed. Next, the recording control method that is the gist of the present invention will be described.

  When a command signal is output from a computer device provided outside to perform a signal recording operation by rotating the disk 1 at a constant linear velocity 12 times the prescribed linear velocity, which is a high linear velocity, for example. Such a command signal is input to the system control circuit 13 via the interface circuit 14.

  When such a command signal is input, a control operation by the system control circuit 13 based on the command signal is started. The various control operations for the optical pickup 3 and the rotation control operation for the spindle motor 2 are performed as described above, and a description thereof will be omitted.

  In order to record a signal on the disc 1, first, an operation for setting a laser output suitable for the recording operation is performed. Such laser output setting operation is performed by changing the laser output of the test signal to the test writing area provided on the inner periphery side of the disc 1 and detecting the characteristics of the reproduced signal of the recorded signal. Although this operation is performed by using a known technique, the description thereof is omitted.

  When the laser output setting operation is completed, a position recognition operation for performing a recording operation is performed based on information data recorded in an area called PMA provided on the disk 1. When such an operation is performed, an operation for moving the optical pickup 3 to a position for recording a signal and an operation for storing the recording signal output from the computer apparatus in the buffer RAM 22 are performed.

  When the optical pickup 3 moves to the recording position on the disk 1 by such an operation, the recording signal stored in the buffer RAM 22 is read, and the read recording signal is input to the signal recording circuit 16. The recording signal input to the signal recording circuit 16 is subjected to an encoding process by the signal recording circuit 16, that is, a processing operation for adding a synchronization signal or an address signal in accordance with the standard of the disk 1 is performed. To be applied.

  When such a recording signal is input, the laser driving circuit 15 outputs a pulse signal having a width corresponding to the input recording signal to the laser diode 4. The pulse signal shown in FIG. 2 is a signal output from the laser drive circuit 15, and the period of the recording output VR and the period of the reproduction output VP are set corresponding to the recording signal. The recording output VR is a period in which pits are formed on the disc 1, and the output VR is a value set by the laser output setting operation described above.

As a result of outputting a pulse signal corresponding to the recording signal from the laser driving circuit 15, the signal can be recorded on the disk 1. When such a recording operation is performed, the laser light reflected from the signal surface of the disk 1 is converted into an electrical signal by the photodetector 5 and input to the RF signal amplifier circuit 8. The signal input to the RF signal amplifying circuit 8 is subjected to a signal processing operation by the digital signal processing circuit 12 to extract a synchronization signal and address information, and is used for a rotation control operation of the spindle motor 2 and an address addition operation by the signal recording circuit 16. Used.

  On the other hand, a part of the signal amplified by the RF signal amplifier circuit 8 is input to the sampling circuit 20. The sampling circuit 20 performs the sampling operation by the control operation of the system control circuit 13, and the sampling operation is performed while the recording output VR is output from the laser driving circuit 15 as shown in FIG. To be done. Such an operation is performed by the system control circuit 13 recognizing the level of the drive signal output from the laser drive circuit 15 and outputting the sampling signal to the sampling circuit 20 in accordance with the recognition operation.

  As a result of the sampling operation being performed at the timing described above, a signal obtained from the RF signal amplification circuit 8 is input to the reflected light level detection circuit 21 during sampling. The reflected light level detection circuit 21 detects the level of the signal input by the sampling operation by the sampling circuit 20 and outputs the detected level to the system control circuit 13. The detection level input to the system control circuit 13 is stored in a memory circuit incorporated in the system control circuit 13, and the system control circuit 13 is based on the detection level stored in the memory circuit. An operation for determining the level change is performed.

  The detection level change determination operation by the system control circuit 13 is performed with respect to the level change of the laser beam reflected from the signal surface of the disk 1, and the detection operation is performed during the period when the laser output is the recording output VR. This is performed on the reflected laser light. That is, this period is a period in which a signal is recorded on the disk 1, and the level of the reflected light has a characteristic that it changes corresponding to the shape of the pit recorded on the disk 1.

  If the change in level detected by the reflected light level detection circuit 21 is within a predetermined value while the recording operation is being performed on the disc 1, the recording operation on the disc 1 is normally performed. Therefore, the recording operation to the disk 1 is continued.

  The operation when the recording operation is normally performed as described above is performed. Next, the operation when the level change detected by the reflected light level detection circuit 21 becomes larger than a predetermined value will be described. The fact that the level change detected by the reflected light level detection circuit 21 during the recording operation is larger than a predetermined value means that the shape of the pits recorded on the disk 1 is not in conformity with the standard, It can be determined that the shape is too large or too small.

  When such a determination operation is performed, the current recording speed, that is, in this case, the recording operation cannot be performed at a linear velocity of 12 times. An operation for changing to a state in which a recording operation is performed at a linear velocity of 8 times is performed. Such an operation of changing the recording speed is performed in a state where the recording operation is temporarily interrupted. In a state in which the recording operation on the disk 1 is interrupted, a control operation is performed to increase the rotational linear velocity of the spindle motor 2 to eight times the linear velocity. Such an operation is output from the reference signal generation circuit 18. This can be done by changing the frequency of the reference clock signal to a frequency at which the speed control operation is performed at a linear velocity of 8 times.

  In addition, a rotation change control operation for the spindle motor 2 is performed, and a change operation for changing the laser output output from the laser drive circuit 15 to a laser output suitable for performing a recording operation 8 times is performed. The signal processing operation of the digital signal processing circuit 12 and the encoding processing operation by the signal recording circuit 16 are also changed so as to perform an operation corresponding to the 8 times recording operation.

  When the change operation of each circuit as described above is performed and the rotational speed of the disk 1 is stabilized in a state where it is rotationally driven at a constant linear velocity of 8 times, an operation for resuming the recording operation from the recording interruption position is performed. . Since such an operation can be performed in the same manner as the technique for preventing the buffer underrun error, a detailed description thereof is omitted, but the basic operation is performed as follows.

  That is, when the recording operation can be performed at a linear velocity of 8 times, first, the position of the optical pickup 3 is set to a predetermined amount from the position where the recording operation is interrupted, for example, a predetermined time of a recording signal or a predetermined track. Retreat. When the position of the optical pickup 3 is moved backward by a predetermined amount in this way, the signal reproduction operation is started from that position. The signal reproduced by such a reproducing operation is a signal recorded before the recording operation is interrupted on the disk 1.

  When the synchronization processing operation of the synchronization signal obtained from the signal reproduced in this way and the recording clock signal generated to perform the recording operation is performed, and the position of the optical pickup 3 reaches the recording interruption position The recording signal stored in the buffer RAM 22, that is, the recording signal stored before the recording interruption is read out and the operation of switching to the state in which the recording operation to the disk 1 is performed is performed.

  As described above, when it is determined that the recording operation at the linear velocity of 12 times cannot be normally performed, the state is changed to the state where the recording operation at the linear velocity of 8 times is performed. Signal recording operation can be performed with better recording characteristics than recording characteristics.

  In this embodiment, the linear velocity changing operation is performed by interrupting the recording operation. However, the linear velocity can be changed while changing the recording velocity. That is, in such an operation, the rotational speed of the disk 1 decreases with the linear speed changing operation, but the digital signal processing circuit 12 and the signal recording circuit 16 are matched to the frequency of the synchronization signal obtained from the decreasing disk. It is possible to perform this by changing the signal processing speed.

  In this embodiment, the case where the recording operation is performed at the same linear velocity from the inner circumference side to the outer circumference side of the disk 1 has been described. However, as the recording position moves from the inner circumference side to the outer circumference side, the linear velocity is decreased from the lower speed. The present invention can be applied to an optical disk recording apparatus configured to change at high speed, that is, an optical disk recording apparatus of a system called ZONE-CLV. In the optical disk recording apparatus of such a system, when moving to the ZONE provided on the outer peripheral side, an operation for changing the recording linear velocity to a high linear velocity is performed. In the ZONE that performs the recording operation at this high linear velocity, When the level of the reflected light detected by the reflected light level detection circuit 21 changes greatly, an operation for changing to a recording linear velocity in the inner circumferential side ZONE, that is, a low linear velocity is performed.

  Further, in this embodiment, the pulse signal for recording a signal on the disk 1 is described as the binary pulse signal shown in FIG. 2, but such a pulse signal can be recorded only once. That is, it is a pulse signal for recording a signal on a write-once disc. In an optical disc recording apparatus using a rewritable disc that can repeatedly perform a recording operation on such a recordable disc, the signal is expressed by a pulse signal composed of a reproduction output, a recording output, and an erasing output level. It is configured to perform the recording operation, and even in this case, the operation for determining whether or not the recording operation is normally performed by detecting the level of reflected light obtained while the recording output is being output. Therefore, the same operation as in this embodiment can be performed.

1 is a circuit diagram showing an embodiment of an optical disk recording apparatus according to the present invention. It is a wave form diagram for demonstrating operation | movement of this invention.

Explanation of symbols

1 disc
2 Spindle motor
3 Optical pickup
4 Laser diode
5 photodetectors
8 RF signal amplifier circuit
DESCRIPTION OF SYMBOLS 9 Pickup control circuit 12 Digital signal processing circuit 13 System control circuit 15 Laser drive circuit 16 Signal recording circuit 19 Spindle motor drive circuit 20 Sampling circuit 21 Reflected light level detection circuit 22 Buffer RAM

Claims (4)

A recording control method for an optical disk recording apparatus capable of recording a signal while rotating the disk with a constant linear velocity constant and a linear velocity higher than a prescribed linear velocity. An optical disc characterized by detecting the level of laser light reflected from the disc when performing a recording operation at a constant, and reducing the recording linear velocity when the change in the detected level exceeds a predetermined value. A recording control method for a recording apparatus. A recording control method for an optical disc recording apparatus capable of performing a signal recording operation by changing the recording linear velocity stepwise from the inner circumference side to the outer circumference side as the recording position moves from the inner circumference side to the outer circumference side. When the recording operation is performed with the recording speed changed to a high linear velocity due to movement to the side, the level of the laser beam reflected from the disk is detected, and the change in the detection level exceeds a predetermined value. Recording control method for optical disk recording apparatus, wherein recording linear velocity is reduced 3. The recording control method according to claim 1, wherein the level detection operation of the reflected laser beam is performed while the laser output is at the recording level. When the change in the detection level exceeds a predetermined value, the recording operation is interrupted and then the recording linear velocity is lowered. When the disc rotation speed is stabilized at the reduced linear velocity, the recording operation is resumed from the recording interruption position. The recording control method according to claim 1, wherein the recording control method is performed.

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