JP4302044B2 - Recording control method for optical disc recording / reproducing apparatus - Google Patents

Description

  The present invention relates to a recording control method for an optical disk recording / reproducing apparatus that performs a signal recording operation on an optical disk with laser light emitted from a laser diode incorporated in an optical pickup.

  2. Description of the Related Art An optical disk recording / reproducing apparatus that performs a signal recording operation on an optical disk with laser light emitted from a laser diode has become widespread. As an optical disk recording / reproducing apparatus, an apparatus using an optical disk called CD and an apparatus using an optical disk called DVD are generally used.

  The signal recording operation on the optical disk is performed by forming pits on a signal track provided on the optical disk with laser light. The length of such pits is 3T, 4T. In a DVD disc, 3T, 4T... 14T are specified.

  The recording operation on the optical disk is performed by supplying a drive pulse corresponding to the recording signal to the laser diode, that is, a pulse signal as shown in FIG. It is set based on the recording strategy set according to the characteristics.

  Such a recording strategy is set such that the spot shape of the laser light emitted from the optical pickup is constant, and the diameter in the tangential direction of the track, that is, the tangential direction is constant. However, the direction of the laser beam spot is not constant and differs for each optical pickup.

  In order to improve such a point, a technique for adjusting the spot direction of a laser beam with respect to a track on an optical disc has been developed (see, for example, Patent Document 1).

Further, in an optical disk recording / reproducing apparatus, it is necessary to perform an operation of causing a laser beam emitted from an optical pickup to follow a signal track, and such a control operation is generally performed by a circuit called a tracking servo. There are various tracking control methods for performing such tracking control operation, but based on the phase difference between the signals obtained by adding the signals obtained from the diagonally arranged photodetectors in the quadrant photodetector. A method using a generated tracking error signal, that is, a phase difference detection method is common (see, for example, Patent Document 2).
JP-A-8-63777 JP 2001-266373 A

  The technique described in Patent Document 1 requires a precise adjustment at the time of manufacturing the optical pickup, and thus has a problem that the manufacturing cost increases. In addition, even if an optical pickup adjusted in this way is used and incorporated in an optical disc recording / reproducing apparatus, the relationship with the spot shape with respect to the track due to the displacement of the mounting position or the change of the spot shape accompanying the focus control operation. Is difficult to keep constant.

  Thus, since the relationship between the track on the optical disk and the spot shape of the laser beam is not constant, the recording operation set in advance in accordance with the recording characteristics of the optical disk is performed in an optimal state. There is a problem that it cannot be done.

  The present invention intends to provide a recording control method capable of solving such a problem.

  The present invention detects and detects the level of a tracking error signal obtained by reproducing a signal recorded on an optical disc in a state where a tracking servo for causing a laser beam spot to follow a signal track is in an inoperative state. The spot shape with respect to the signal track of the laser beam is detected on the basis of the level and the defocus value of the focus servo, and the recording strategy is set based on the detected spot shape.

  The present invention also provides a spot diameter data memory circuit in which spot diameter data corresponding to the tracking error signal level is stored, and detects the spot shape by reading the data corresponding to the detected tracking error signal level. Is configured to do.

  According to the present invention, a recording strategy memory circuit storing a plurality of recording strategy data corresponding to the spot shape is provided, and the recording strategy data stored in the recording strategy memory circuit is selected based on the detected spot shape. Thus, the recording strategy is set.

  The present invention detects and detects the level of a tracking error signal obtained by reproducing a signal recorded on an optical disc in a state where a tracking servo for causing a laser beam spot to follow a signal track is in an inoperative state. Since the spot shape for the signal track of the laser beam is detected based on the level and the defocus value of the focus servo, and the recording strategy is set based on the detected spot shape, this affects the recording operation on the signal track. The length of the spot to be recognized can be recognized, and as a result, a recording strategy suitable for performing the recording operation can be set accurately.

  The present invention also provides a spot diameter data memory circuit in which spot diameter data corresponding to the tracking error signal level is stored, and detects the spot shape by reading the data corresponding to the detected tracking error signal level. As a result, the spot shape can be easily recognized.

  According to the present invention, a recording strategy memory circuit storing a plurality of recording strategy data corresponding to the spot shape is provided, and the recording strategy data stored in the recording strategy memory circuit is selected based on the detected spot shape. Thus, since the recording strategy is set, the signal recording operation on the optical disc can be performed accurately.

  The present invention detects the spot shape of a laser beam by detecting the level of a tracking error signal in a state where a tracking servo for causing the spot of the laser beam irradiated from an optical pickup to follow a signal track is in an immobile state. Has been.

  FIG. 6 is a circuit diagram for explaining a circuit for generating a tracking error signal according to the present invention, that is, a phase difference detection method. In the figure, reference numeral 1 denotes a four-divided photodetector that receives laser light reflected from the optical disk D, and is composed of four photodetectors A, B, C, and D.

  Reference numeral 2 denotes a first adder circuit for adding signals obtained from the photodetectors A and C constituting the quadrant photodetector 1. Reference numeral 3 denotes a photodetector obtained from the photodetectors B and D constituting the quadrant photodetector 1. This is a second adder circuit for adding the received signals. Reference numeral 4 denotes a first equalizer circuit for correcting the frequency of the first addition signal output from the first addition circuit 2, and reference numeral 5 denotes a second equalizer for correcting the frequency of the second addition signal output from the second addition circuit 3. Circuit.

  Reference numeral 6 denotes a first comparator circuit to which the first addition signal whose frequency is corrected by the first equalizer circuit 4 is input. When the input signal exceeds a predetermined level, a first pulse that becomes H (high) during that time. It is configured to output a signal. Reference numeral 7 denotes a second comparator circuit to which the second addition signal whose frequency has been corrected by the second equalizer circuit 5 is input, and outputs a second pulse signal that attains an H level when the input signal exceeds a predetermined level. Is configured to do.

  Reference numeral 8 denotes a phase difference detection circuit that receives a first pulse signal output from the first comparator circuit 6 and a second pulse signal output from the second comparator circuit 7 and detects a phase difference between the two pulse signals. When the phase of the first pulse signal is ahead of the phase of the second pulse signal, the first output terminal 8A for outputting the first detection pulse signal having a width corresponding to the phase difference and the phase of the second pulse signal are A second output terminal 8B is provided for outputting a second detection pulse signal having a width corresponding to the phase difference when the phase is advanced from the phase of the first pulse signal.

  Reference numeral 9 denotes a first low-pass filter circuit to which a signal output from a first output terminal 8A provided in the phase difference detection circuit 8 is input. Reference numeral 10 denotes a second output terminal provided in the phase difference detection circuit 8 A second low-pass filter circuit to which a signal output from 8B is input, 11 is a subtraction circuit to which the output signals of the first low-pass filter circuit 9 and the second low-pass filter circuit 10 are input, and the difference between the input signals The signal is output to the output terminal 11A as a tracking error signal.

  As described above, the phase difference detection type tracking error signal generation circuit is configured. Next, the detection operation will be described with reference to the waveform diagrams shown in FIGS. FIG. 7A shows the waveforms of the first addition signal output from the first equalizer circuit 4 and the second addition signal output from the second equalizer circuit 5, and the solid line indicates the first addition signal and the broken line. Is the second addition signal.

  FIG. 7B shows the waveform of the first pulse signal output from the first comparator circuit 6. The period exceeding the comparison reference level VR shown in FIG. ing. FIG. 7C shows the waveform of the second pulse signal output from the second comparator circuit 7. The period exceeding the comparison reference level VR shown in FIG. ing.

  FIG. 7D shows the waveform of the first detection pulse signal output to the first output terminal 8A of the phase difference detection circuit 8, and the phase of the first pulse signal is ahead of the phase of the second pulse signal. The period of time is indicated by H level. FIG. 7E shows the waveform of the second detection pulse signal output to the second output terminal 8B of the phase difference detection circuit 8, and the phase of the second pulse signal is advanced from the phase of the first pulse signal. The period of time is indicated by H level.

  FIG. 8 is a waveform diagram showing a change in the level of the tracking error signal output to the output terminal 11A of the subtracting circuit 11, and the phase difference amount changes according to the deviation of the light beam from the signal track, that is, off-track. The level of the tracking error signal changes according to the phase difference.

  The tracking control operation in the optical disk recording / reproducing apparatus according to the present invention is performed by using the tracking error signal obtained by the circuit described above. Next, the optical disk recording / reproducing apparatus according to the present invention shown in FIG. 1 will be described.

  In FIG. 1, reference numeral 12 denotes an optical pickup incorporating a laser diode 13 for irradiating a laser beam. An objective lens 14 for focusing the laser beam irradiated from the laser diode 13 on a recording layer of the optical disc D, and an optical disc D A laser coil 15 that receives the laser beam reflected from the light source and converts it into an electrical signal, and a tracking coil 16 that displaces the objective lens 14 in the radial direction of the optical disc D, and the photodetector 15 composed of the above-described quadrant photodetector 1 and the like A focusing coil 17 for displacing the objective lens 14 in a direction perpendicular to the signal surface of the optical disc D is incorporated.

  In such a configuration, the main body of the optical pickup 12 is configured to be displaced in the radial direction of the optical disc D by a pickup feeding motor (not shown). Since such a driving mechanism may use a known mechanism, the description thereof is omitted.

  Reference numeral 18 denotes an optical output signal processing circuit to which an electrical signal obtained from the photodetector 15 is input as an optical signal, and generates a tracking error signal for generating a tracking error signal indicating a deviation from the signal track of the laser light as described above. The circuit is built in. The optical output signal processing circuit 18 incorporates a focus error signal generation circuit (not shown) that outputs a focus error signal indicating a focus shift with respect to the recording layer of the laser beam. The optical output signal processing circuit 18 incorporates a signal reproduction circuit (not shown) that generates a signal obtained by binarizing the reproduction signal of the signal recorded on the optical disc D. Since the generation operation of various signals by the optical output signal processing circuit 18 is performed by a known circuit, the description thereof is omitted.

  Reference numeral 19 denotes a tracking servo circuit to which a tracking error signal output from an output terminal 11A of a tracking error signal generation circuit incorporated in the optical output signal processing circuit 18 is input, and a tracking coil based on the input tracking error signal A tracking control operation is performed by supplying a drive signal to the tracking coil 16.

  Reference numeral 20 denotes a focus servo circuit to which a focus error signal generated and output by the optical output signal processing circuit 18 is input, and supplies a focusing coil drive signal based on the input focus error signal to the focusing coil 17. Is configured to perform a focus control operation.

  The focusing coil drive signal supplied from the focus servo circuit 20 to the focusing coil 17 is accompanied by a DC voltage that displaces the objective lens 14 to an operating position that is a position for focusing the recording layer of the optical disk D and surface vibration of the optical disk D. In order to correct the focus shift, it is composed of a high-frequency signal for displacing the objective lens 14 at a high speed. Since such a signal is well known, a description thereof is omitted.

21 is a digital signal processing circuit for inputting a reproduction signal binarized by a binarization circuit provided in the optical output signal processing circuit 18 and performing digital signal processing;
Various signals such as a synchronization signal, position information data, and a recording signal recorded on the optical disc D are demodulated. A system control circuit 22 controls each operation of the optical disk recording / reproducing apparatus, and uses the synchronization signal generated by the digital signal processing circuit 21 to control the rotation control of the optical disk D by the spindle motor and the reproduction signal and recording signal. It is configured to control processing operations and signal transmission / reception operations with a host device such as a personal computer provided outside. Such a system control circuit 22 is configured by a microcomputer and is configured to perform various control operations based on program software stored in a flash ROM or the like provided therein.

  Reference numeral 23 denotes a signal recording circuit to which a recording signal input from a personal computer or the like or a test signal generated by the system control circuit 22 is input. The recording signal is subjected to encoding processing such as interleaving in accordance with the standard of the optical disc D. Has an effect. Since the encoding processing operation and the like by the signal recording circuit 23 are well known, the description thereof is omitted.

  Reference numeral 24 denotes a laser drive signal generation circuit to which the recording signal encoded by the signal recording circuit 23 is input. A drive signal suitable for forming 3T, 4T... 14T pits corresponding to the recording signal is provided. Configured to generate. A laser drive circuit 25 outputs a signal for driving the laser diode 13 in accordance with the drive signal generated and output from the laser drive signal generation circuit 24.

  A laser drive signal control circuit 26 whose operation is controlled by the system control circuit 22 is configured to control a drive signal generation operation by the laser drive signal generation circuit 24. A recording strategy memory circuit 27 incorporated in the system control circuit 22 stores strategy data corresponding to the spot diameter of laser light, which will be described later, as table data.

  The control operation for the laser drive signal generation circuit 24 by the laser drive signal control circuit 26 is performed based on the table data obtained from the recording strategy memory circuit 27. That is, the drive signal supplied from the laser drive signal generation circuit 24 to the laser drive circuit 25 is a pulse signal as shown in FIG. 3, and when a 3T pit is formed, a signal of only the first pulse P1 and 4T In the case of forming the pit, a signal composed of the leading pulses P1 and P2, and in the case of forming a 5T pit, a driving signal composed of the leading pulses P1, P2 and P3 is output to the laser driving circuit 25. Thus, the width of the pulses P1, P2, and P3 and the interval between the pulses are changed and set based on the table data obtained from the recording strategy memory circuit 27.

  Reference numeral 28 denotes a tracking error signal level detection circuit that detects the level of the tracking error signal output from the tracking error signal output terminal 11A provided in the optical output signal processing circuit 18, and has a peak that is the maximum level of the tracking error signal. A level between the level and the lowest level, that is, a level indicated by EV in FIG. 8 is detected, and the detected level is binarized and output to the system control circuit 22. Yes.

  Reference numeral 29 denotes a defocus value setting circuit for setting a defocus value, which is a control voltage supplied to the focusing coil 17 by the focus servo circuit 20, and the operation is controlled by the system control circuit 22. Reference numeral 30 denotes a spot diameter data memory circuit incorporated in the system control circuit 22, and data indicating the relationship among the defocus value, the level EV of the error signal, and the spot diameter is stored as table data.

  In such a configuration, the operation / non-operation of the tracking servo circuit 19 is configured to be selectively controlled by the system control circuit 22, and the tracking error signal level detection operation by the tracking error signal level detection circuit 28 is performed by the tracking servo. The circuit 19 is configured to be in a non-operating state. The signal for performing the level detection operation of the tracking error signal uses, for example, a test signal recorded in a test writing area provided for performing a laser output setting operation on the inner circumference side of the optical disc D. It is configured.

  In addition, a groove called a pregroove is formed in the recording optical disk D, and the rotational driving operation of the optical disk D is performed based on a synchronization signal or position information data obtained by demodulating a wobble signal obtained from the pregroove. And the displacement operation of the optical pickup 12 is controlled.

  As described above, the optical disk recording / reproducing apparatus according to the present invention is configured. Next, the operation will be described. When the reproduction operation of the signal recorded on the optical disc D is performed, the rotation control operation of the spindle motor is performed, and the optical disc D is rotationally driven at a predetermined linear velocity. Such a control operation for keeping the linear velocity constant includes a synchronization signal read from the optical disc D and a synchronization signal generated from a synchronization signal generation circuit (not shown) connected to be controlled by the system control circuit 22. Are synchronized with each other, but since such operations are well known, the description thereof will be omitted.

  The drive signal supplied to the laser diode 13 for reproducing the signal recorded on the optical disc D is set so as to obtain a laser output necessary for performing the reproduction operation. The laser light emitted from the laser diode 13 is condensed by the objective lens 14 and focused on the signal surface which is the recording layer of the optical disc D. Such focusing operation is performed by the focus servo circuit 20. This is done by servo operation.

  The focus control operation by the focus servo circuit 20 is performed using a signal obtained from the photodetector 15 irradiated with laser light reflected from the signal surface of the optical disc D. A signal obtained from the photodetector 15 is input to the optical output signal processing circuit 18, a focus error signal is generated based on the signal, and the focus error signal is input to the focus servo circuit 20.

  When such a focus error signal is input to the focus servo circuit 20, a drive signal for displacing the objective lens 14 in a direction to reduce the level of the focus error signal is supplied from the focus servo circuit 20 to the focusing coil 17. . As a result of supplying such a drive signal to the focusing coil 17, an operation of focusing the laser beam on the signal surface of the optical disc D, that is, a focus control operation can be performed.

  Although the focus control operation is performed as described above, the tracking control operation can be performed in the same manner. That is, when the spot of the laser light emitted from the laser diode 13 deviates from the signal track on the optical disc D, a tracking error signal of a level corresponding to the magnitude of the deviating magnitude is output to the tracking error signal output terminal of the optical output signal processing circuit 18 11A.

When such a tracking error signal is input to the tracking servo circuit 19, a driving signal for displacing the objective lens 14 in a direction to reduce the level of the tracking error signal is supplied from the tracking servo circuit 19 to the tracking coil 16. . As a result of supplying such a drive signal to the tracking coil 16, an operation of causing the laser beam to follow a signal track provided on the signal surface of the optical disc D, that is, a tracking control operation can be performed.

  As a result of the above-described focus control operation and tracking control operation being performed, a signal recorded on the signal track of the optical disc D can be read. A signal track of the optical disc D is recorded with a plurality of pits having different lengths, and an RF signal corresponding to the length of the pits is generated by the optical output signal processing circuit 18 and binarized. Is output.

  The binarized signal output from the optical output signal processing circuit 18 is input to the digital signal processing circuit 21, and demodulation operation is performed by the digital signal processing circuit 21. The data signal demodulated by the digital signal processing circuit 21 is output to a personal computer or the like via the system control circuit 22.

  As described above, the reproducing operation in this embodiment is performed. Next, the recording operation will be described. The rotation control operation of the optical disc D by the spindle motor during the recording operation, the tracking control operation by the tracking servo circuit 19, and the focus control operation by the focus servo circuit 20 are performed in the same manner as in the reproducing operation described above.

  A recording signal output from the personal computer is input to the signal recording circuit 23 and encoded by the signal recording circuit 23. Since the recording signal encoded by the signal recording circuit 23 is input to the laser drive signal generation circuit 24, the laser drive signal generation circuit 24 creates a pit having a length corresponding to the input recording signal on the optical disc. A drive signal for forming the signal track D is output to the laser drive circuit 25.

  In such a case, the pulse waveform of the drive signal supplied to the laser drive circuit 25 is generated by a control operation by the laser drive signal control circuit 26 based on the strategy data selected from the recording strategy memory circuit 27. When the pulse waveform drive signal thus generated and controlled is supplied to the laser drive circuit 25, the drive signal corresponding to the pulse waveform is supplied from the laser drive circuit 25 to the laser diode 13.

  When such a drive signal is supplied to the laser diode 13, a laser beam corresponding to the pulse is emitted from the laser diode 13, and a pit is formed on the signal track of the optical disc D. The length of the pit formed by such an operation is 3T, 4T... 14T corresponding to the signal standard of the optical disc D.

  As described above, the recording operation in the present embodiment is performed. Next, the laser beam spot shape recognition operation, which is the gist of the present invention, will be described.

  FIG. 2 shows the relationship between the pits P formed on the signal track of the optical disc D and the laser light spot S. FIG. 2A shows a case where the shape of the spot S is almost circular, and FIG. 2B shows a case where the shape of the spot S is an ellipse and the major axis direction is inclined by about 45 degrees with respect to the signal track direction. FIG. 2C shows the case where the shape of the spot S is an ellipse and the major axis direction is perpendicular to the signal track direction.

  The spot S of the laser beam that acts to form the pits P on the optical disk D is a portion that overlaps the pits P in FIG. 2, and as is clear from each state, the length direction of the pits P, that is, tangential The effective length, which is the length of the direction, will be different.

The present invention improves the deterioration of the recording characteristics due to the difference in effective length due to the difference in the shape of the spot S. That is, the recording strategy is changed according to the change in effective length.

  Next, an operation for detecting the shape of the spot S that causes the effective length to be different will be described. Such a detection operation is performed by reproducing a test signal recorded at the time of adjusting the laser output in the test writing area provided on the optical disc D. The reproduction operation does not operate the tracking servo circuit 19. It is performed in the state made into the state.

  The movement of the optical pickup 12 to the test writing area can be performed by an operation called search. That is, by reading the position information recorded on the signal track of the optical disc D by repeatedly performing the track jump operation of the optical pickup 12, the optical pickup 12 is moved to the desired track, that is, the position where the test signal is recorded. It can be moved.

  When it is recognized that the optical pickup 12 has moved to a desired position by such an operation, an operation for disabling the tracking servo circuit 19 is performed while the focus control operation by the focus servo circuit 20 is performed. Done. In such a state, the test signal recorded in the test writing area of the optical disc D is read out, but the test signal cannot be read out normally because the tracking servo circuit 19 is in an immobile state. In such a state, the difference between the spot S of the laser beam and the signal track becomes large, so that the level of the tracking error signal output to the tracking error signal output terminal 11A greatly fluctuates.

  In the present invention, the tracking error signal level detection circuit 28 detects the level EV of the tracking error signal output from the tracking error signal output terminal 11A, and outputs the detected level value to the system control circuit 22. Is going. Therefore, the system control circuit 22 can recognize the level EV of the tracking error signal.

  Next, the relationship between the level EV of the tracking error signal and the spot length L in the radial direction of the spot S which is the irradiation shape of the laser beam, that is, the spot diameter in the radial direction will be described with reference to FIGS.

  FIG. 4 shows the relationship between the defocus value, tracking error signal EV, and spot length L when the optical system of the optical pickup 12 has no astigmatism. In the figure, a solid line T indicates a change in the level EV of the tracking error signal with respect to a change in the defocus value of the focus servo circuit 20, and a solid line L indicates a change in the spot length L with respect to a change in the defocus value of the focus servo circuit 20. Is shown.

  FIG. 5 shows the relationship between the defocus value, tracking error signal EV and spot length L when the optical system of the optical pickup 12 has astigmatism. In the figure, a solid line T indicates a change in the level EV of the tracking error signal with respect to a change in the defocus value of the focus servo circuit 20, and a solid line L indicates a change in the spot length L with respect to a change in the defocus value of the focus servo circuit 20. Is shown.

As apparent from the change in the level EV of the tracking error signal and the change in the spot length L shown in FIGS. 4 and 5, the relationship between the level EV of the tracking error signal and the spot length L changes in contrast. is there. Accordingly, if data indicating the relationship between the level EV of the tracking error signal and the spot length L for each defocus value is stored in the spot diameter data memory circuit 30 as table data, the tracking error signal level detection circuit 28 causes the tracking error signal to be detected. The spot length L can be obtained by detecting the signal level EV.

  The spot length L, which is the radial length of the spot S, can be detected by the above-described operation, but the area of the laser beam spot S is set to be substantially the same from the characteristics of the optical pickup 12. Therefore, if the areas of the spots S are substantially the same, the length in the signal track direction becomes shorter as the length L in the radial direction becomes longer. As a result, the length of the pits P in the track direction becomes smaller. The effective length of the spot S, ie, the length of the spot S located on the pit P is shortened.

  Since the shape of the spot S with respect to the signal track can be detected in this way, the effective length can be recognized from the level EV of the tracking error signal. Accordingly, the recording strategy data required for generating the recording pulse corresponding to the radial diameter of the spot S at the time of manufacturing the optical disc recording / reproducing apparatus is stored in the recording strategy memory circuit 27 as table data and the data is stored. The laser drive signal generation circuit 24 can generate a drive signal for the laser diode 13 that is suitable for performing a recording operation by selecting and using.

  In this embodiment, the level of the tracking error signal obtained when reproducing the signal recorded in the test writing area provided on the optical disc D is detected. However, the level is recorded in the signal recording area. It is also possible to detect the level of the tracking error signal that is obtained when the reproduced signal is reproduced.

1 is a block circuit diagram showing an embodiment of an optical disc recording / reproducing apparatus according to the present invention. It is explanatory drawing which shows the relationship between the pit formed in the signal track | truck of an optical disk, and the spot of a laser beam. It is a signal waveform diagram for demonstrating operation | movement of this invention. It is a characteristic view for demonstrating operation | movement of this invention. It is a characteristic view for demonstrating operation | movement of this invention. 1 is a block circuit diagram showing an embodiment of a tracking error signal generation circuit used in the present invention. FIG. It is a signal waveform diagram for demonstrating operation | movement of this invention. It is a signal waveform diagram for demonstrating operation | movement of this invention.

Explanation of symbols

D optical disk 12 optical pickup 13 laser diode 15 photodetector 16 tracking coil 17 focusing coil 18 optical output signal processing circuit 19 tracking servo circuit 20 focus servo circuit 21 digital signal processing circuit 22 system control circuit 23 signal recording circuit 24 laser drive Signal generation circuit 25 Laser drive circuit 26 Laser drive signal control circuit 27 Recording strategy memory circuit 28 Tracking error signal level detection circuit 29 Defocus value setting circuit 30 Spot diameter data memory circuit

Claims (3)

A tracking control operation is performed using a tracking error signal generated based on a phase difference between signals obtained by adding signals obtained from diagonally arranged photodetectors in the quadrant photodetector. Is a recording control method of an optical disk recording / reproducing apparatus using an optical pickup configured as described above, and is recorded on an optical disk in a state in which a tracking servo for causing a laser beam spot to follow a signal track is inoperative. The level of the tracking error signal obtained when reproducing the signal is detected, and the spot shape for the signal track of the laser beam is detected based on the detected level and the defocus value of the focus servo. Based on the detected spot shape Optical disc recording / playback characterized in that a recording strategy is set. Recording control method of location. A spot diameter data memory circuit that stores spot diameter data corresponding to the level of the tracking error signal is provided, and the spot shape is detected by reading the data corresponding to the level of the detected tracking error signal. The recording control method according to claim 1, wherein: A recording strategy memory circuit storing a plurality of recording strategy data corresponding to the spot shape is provided, and the recording strategy is set by selecting the recording strategy data stored in the recording strategy memory circuit based on the detected spot shape. The recording control method according to claim 2, wherein the recording control method is performed.

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