JP2005216441A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly execute forwarding/rewinding, program searching or the like without reducing a search speed even in the case of an optical disk greatly made eccentric from the standard eccentric amount of an optical disk by improving pulling-in performance during the tracking pulling-in of an optical pickup. <P>SOLUTION: When an optical disk is loaded on the disk device, the rotational angle of the optical disk is detected, a track cross signal with respect to the detected rotational angle of the optical disk is measured, the amplitude and the cycle of the eccentricity of the optical disk with respect to the rotational angle are detected based on the measured track cross signal with respect to the rotational angle of the optical disk, the detected amplitude and the cycle of the eccentricity of the optical disk with respect to the detected rotational angle of the optical disk are stored and, during the playing of the optical disk, the tracking of the optical pickup is controlled in synchronization with the stored amplitude and the cycle of the eccentricity of the optical disk with respect to the rotational angle of the optical disk to execute the tracking pulling-in of the optical pickup. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a disk apparatus for reproducing an optical disk such as a DVD (Digital Versatile Disc), and more particularly to a disk apparatus capable of improving tracking pull-in performance for an eccentric optical disk.

In general, an optical disc such as a DVD is manufactured so that its eccentricity is defined by the standard of the optical disc, and the eccentricity of the optical disc is within the standard. However, there is an optical disc that is decentered more than the decentration amount of the standard of the optical disc due to a shift of the position of the center hole of the optical disc. In addition, the optical disk may be decentered due to an axis shift of the spindle motor of the disk device, variations in chucking of the optical disk, or the like. If the optical disk is eccentric more than the standard eccentricity, the tracking servo circuit is burdened, and it is difficult to match the tracking pull-in timing of the optical pickup in response to the movement of the optical disk track when pulling in the tracking of the optical pickup. There has been a problem that tracking pull-in of the optical pickup becomes slow, search speed at the time of reproducing the optical disk becomes slow, and feed / return, cueing, etc. cannot be performed quickly.
As a background art, when performing tracking pull-in, the relative speed between the moving speed of the optical disk to be pulled in the track direction and the moving speed of the optical pickup is detected, and the polarity of the actuator drive voltage is determined according to the detected relative speed. In some cases, the voltage value is controlled to perform tracking pull-in when the zero-cross period of the tracking error signal exceeds a predetermined range (see, for example, Patent Document 1).
In addition, the eccentric component of the tracking drive signal is related to the rotational position of the spindle motor, and the position where the tracking can be pulled in most stably is detected based on that information, and the jump is performed based on the positional information and the rotational position of the spindle motor at the start of seeking. The starting point is determined, and tracking pull-in is performed at a position where the track and sled feed are least affected by the eccentric component (see, for example, Patent Document 2).
Further, the optical disk is rotated at a first rotational frequency sufficiently lower than the natural frequency of the entire components on the base of the disk device, and the track cross is counted with a sign to measure the eccentricity of the track of the optical disk, The optical disk is rotated at a second rotational speed higher than the first rotational speed, the objective lens is reciprocated in the radial direction of the optical disk to cancel the tracking error component due to eccentricity, and the self-excited vibration is derived from the amplitude of the tracking error signal. There is one that measures the amplitude of (see, for example, Patent Document 3).
In addition, during focus servo execution, the optical spot of the laser beam emitted from the optical pickup during one rotation of the optical disc is moved by a predetermined distance in the radial direction of the optical disc, and the track cross signal obtained during that time is off-track. In some cases, the track pitch is calculated by counting in consideration of the phase relationship with the signal, and the type of the optical disc having a different track pitch is discriminated (for example, see Patent Document 4).
JP 2003-196849 A JP 2003-272185 A JP 2003-303464 A JP 2003-317273 A

However, in the first one described in the background art, when performing tracking pull-in, the relative speed between the moving speed of the optical disk to be pulled in the track direction and the moving speed of the optical pickup is detected, and the detected relative speed is detected. In response to the control, the polarity and voltage value of the actuator drive voltage were controlled, and the tracking pull-in was performed when the zero-cross period of the tracking error signal exceeded the specified range. However, the above-mentioned problems that occur when the tracking of the optical disk is pulled in are not solved.
In the following, the eccentric component of the tracking drive signal is associated with the rotational position of the spindle motor, and the position where the tracking can be pulled in most stably is detected based on that information, and the position information and the spindle at the start of seek are detected. The jump start point was determined by the rotational position of the motor, and tracking pull-in was performed at a position where the track and sled feeds were most unaffected by the eccentric component. It was not intended to solve the above-mentioned problems that occurred during tracking pull-in.
Further, in the next one, the optical disk is rotated at a first rotational speed sufficiently lower than the natural frequency of the entire components on the base of the disk device, and the track cross is counted with a sign and the optical disk is counted. Measuring the eccentricity of the track, rotating the optical disk at a second rotational speed higher than the first rotational speed, and reciprocatingly vibrating the objective lens in the radial direction of the optical disk to cancel the tracking error component due to the eccentricity, thereby tracking Although the amplitude of the self-excited vibration was able to be measured from the amplitude of the error signal, it did not solve the above-mentioned problem that occurred when the tracking of the optical disc decentered larger than the decentration amount of the standard of the optical disc.
Further, in the next one, during the focus servo execution, the optical spot of the laser beam irradiated from the optical pickup during one rotation of the optical disc is moved by a predetermined distance in the radial direction of the optical disc. The resulting track cross signal was counted in consideration of the phase relationship with the off-track signal to calculate the track pitch, and the type of the optical disc with a different track pitch could be discriminated. However, this has not solved the above-mentioned problem that occurs when tracking an eccentric optical disc.
The present invention has been made in view of such problems of the background art, and the object of the present invention is to improve the pull-in performance at the time of tracking pull-in of the optical pickup and to reduce the eccentricity of the optical disc standard. It is an object of the present invention to provide a disk device capable of quickly performing feeding / returning, cueing and the like without a decrease in search speed even with a large eccentricity optical disk.

In order to achieve the above object, according to the present invention, there is provided a disk device for reproducing a video / audio signal recorded on an optical disk, the rotation angle detecting means for detecting the rotation angle of the optical disk, and the rotation angle detecting means. Measuring means for measuring the track cross signal with respect to the rotation angle of the optical disc, and eccentricity for detecting the amplitude and period of the eccentricity of the optical disc with respect to the rotation angle of the optical disc based on the track cross signal with respect to the rotation angle of the optical disc measured by the measuring means Detection means; storage means for storing the amplitude and period of the optical disk eccentricity relative to the rotation angle of the optical disk detected by the eccentricity detection means; and the amplitude of the optical disk eccentricity relative to the rotation angle of the optical disk stored in the storage means That controls the tracking of the optical pickup in synchronization with the period When the optical disk is loaded on the disk device, the eccentricity detecting means detects the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk, stores it in the storage means, and reproduces the optical disk. The tracking of the optical pickup is performed by controlling the tracking of the optical pickup in synchronization with the amplitude and period of the eccentricity of the optical disc with respect to the rotation angle of the optical disc stored in the storage means by the control means. To.
The rotation angle detecting means may detect the rotation angle of the optical disk by detecting an FG signal generated by rotation of a spindle motor that rotates the optical disk.
The control means may control the tracking of the optical pickup by reciprocating the optical pickup in the radial direction of the optical disk in synchronization with the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk.
By these means, the pull-in performance at the time of tracking pull-in of the optical pickup is improved, and even if the optical disk is decentered larger than the decentration amount of the standard of the optical disk, the search speed is not lowered, and the feeding / returning, cueing, etc. Can be done quickly.

According to the disk device of the first aspect of the invention, when the optical disk is loaded on the disk apparatus, the rotation angle of the optical disk is detected by detecting the FG signal generated by the rotation of the spindle motor that rotates the optical disk, The track cross signal with respect to the detected rotation angle of the optical disc is measured, and the amplitude and period of the eccentricity of the optical disc with respect to the rotation angle of the optical disc are detected based on the measured track cross signal with respect to the rotation angle of the optical disc. The amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk is stored, and the optical pickup is synchronized with the amplitude and period of the eccentricity of the optical disk with respect to the stored rotation angle of the optical disk when reproducing the optical disk. Control the tracking of the optical pickup. Since the tracking of the optical pickup is performed, the tracking of the optical pickup is servo controlled in synchronization with the amplitude and period of the eccentricity with respect to the rotation angle of the optical disk. The pull-in performance can be improved, and even with an optical disc that is decentered more than the decentration amount of the standard of the optical disc, search / feedback, cueing, etc. can be performed quickly without a decrease in search speed.
According to the disc device of the second aspect of the invention, when the optical disc is loaded on the disc device, the rotation angle of the optical disc is detected, and the track cross signal with respect to the detected rotation angle of the optical disc is measured and measured. Detecting the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk based on the track cross signal with respect to the rotation angle of the optical disk, and storing the amplitude and period of the eccentricity of the optical disk with respect to the detected rotation angle of the optical disk; When reproducing an optical disk, the optical pickup tracking is controlled in synchronization with the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the stored optical disk so that the tracking of the optical pickup is performed. Tracking of the eccentricity with respect to the rotation angle of the optical disk Since the servo control is performed in synchronization with the cycle, the pull-in performance during tracking pull-in of the optical pickup can be improved, and even if the optical disc is decentered more than the decentration amount of the optical disc standard, the search speed The feed / return, cueing, and the like can be performed quickly without lowering.
According to the disk device of the third aspect of the invention, since the FG signal generated by the rotation of the spindle motor that rotates the optical disk is detected to detect the rotation angle of the optical disk, the optical disk can be detected without adding parts. Can be detected.
According to the disc device of the present invention, the optical pickup is reciprocated in the radial direction of the optical disc in synchronization with the amplitude and period of the eccentricity of the optical disc with respect to the rotation angle of the optical disc, and the tracking of the optical pickup is controlled. Therefore, even if the optical disk is decentered more than the decentration amount of the standard of the optical disk, the optical pickup can follow the track of the decentered optical disk, and the tracking pull-in performance of the optical pickup can be improved. it can.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a block diagram showing a configuration of a disk device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing movement of an optical pickup of the disk device according to an embodiment of the present invention, and FIG. FIG. 4 is an explanatory diagram showing the locus of the spot light of the laser beam of the disk apparatus of one embodiment. FIG. 4 shows an FG signal, tracking error signal, track cross signal with respect to the rotation period of the optical disk of the disk apparatus of one embodiment of the present invention. FIG. 5 is a flowchart showing the operation of detecting the amount of eccentricity of the optical disk of the disk apparatus according to the embodiment of the present invention, and FIG. 6 is the tracking of the optical pickup of the disk apparatus of the embodiment of the present invention. It is a flowchart which shows the operation | movement of drawing.
First, a description will be given based on the block diagram showing the configuration of the disk device of one embodiment of the present invention shown in FIG.
The disk device 1 irradiates an optical disk 2 with laser light, detects the reflected light, and reads an audio / video signal recorded on the optical disk 2, a spindle motor 4 that rotates the optical disk 2, and a spindle motor 4, a servo servo circuit 5 that servo-controls the rotational speed 4, a tracking servo circuit 6 that servo-controls the tracking of the optical pickup 3 based on a tracking error signal detected by the optical pickup 3, and a focus that is detected by the optical pickup 3. Servo control of the focus servo circuit 7 that servo-controls the focus of the optical pickup 3 based on the error signal, the sled motor 8 that moves the optical pickup 3 in the radial direction of the optical disc 2, and the rotational direction and rotational speed of the sled motor 8 Thread servo circuit 9 The FG signal detection circuit 10 detects the rotation angle of the optical disk by detecting the FG (Frequency Generator) signal generated by the rotation of the spindle motor 4, and the video / audio signal read by the optical pickup 3 based on the reference clock. Synchronous detection, conversion of analog audio / video signals to digital signals, demodulation of audio / video signals converted to digital signals, correction of errors in demodulated audio / video signals, based on a predetermined compression method The compressed video / audio signal is expanded, the original video / audio signal is decoded, and the decoded video / audio signal is converted into a composite video / audio signal in accordance with a predetermined signal system, for example, NTSC (National Television System Committee). ) Format video and audio signals, A signal processing circuit 11 that converts an audio signal into an analog video / audio signal and reproduces and outputs the video / audio signal, a control program that controls the entire system of the disk device 1, and tracking according to the eccentricity of the optical disk A microcomputer 12 having a built-in ROM (Read Only Memory) 12a in which a plurality of lens kick speed control equalizer data for servo control is written and a built-in RAM (Random Access Memory) 12b for temporarily storing various data. It is configured.
The operation of the disk device configured as described above will be described below.
When the optical disk 2 is loaded on the disk device 1, the microcomputer 12 sends a control signal to the spindle servo circuit 5, rotates the spindle motor 4 to rotate the optical disk 2, and sends a control signal to the thread servo circuit 9. Then, the sled motor 8 is driven, and as shown in FIG. 2, the optical pickup 3 is moved along the guide shaft 3a to a position away from the inner circumference of the optical disk 2 by a predetermined distance in the outer circumference direction, and the tracking servo circuit 6 A control signal is sent to the focus servo circuit 7 to servo-control the tracking and focus of the optical pickup 3, and a tracking error signal is detected by the optical pickup 3. The tracking error signal detected by the optical pickup 3 is binarized by the tracking servo circuit 6 based on the zero cross value of the tracking error signal, and the generated track cross signal is sent to the microcomputer 12. The The microcomputer 12 detects the FG signal generated by the rotation of the spindle motor 4 by the FG signal detection circuit 10, measures the track cross signal with respect to the rotation angle of the optical disk 2, and tracks measured while the optical disk 2 makes one rotation. Based on the cross signal, the amplitude and period of the eccentricity of the optical disc 2 with respect to the rotation angle of the optical disc 2 are detected. Here, it is assumed that 6 pulses of the FG signal are generated every time the spindle motor 4 makes one rotation (see FIG. 4A). In this case, the rotation angle of the optical disk 2 can be detected in units of 30 ° by detecting the rising and falling edges of the FG signal.
When the optical disk 2 loaded on the disk device 1 is not decentered, the tracking error signal detected by the optical pickup does not change during one rotation of the optical disk 2, so that a track cross signal pulse signal is not generated. However, as shown in FIG. 3, when the center hole 2a of the optical disk 2 loaded on the disk device 1 is shifted from the center of the optical disk 2, and the optical disk 2 is eccentric more than the eccentric amount of the standard of the optical disk, the optical disk 2 is When the laser beam is not decentered, it deviates from the locus A of the spot light of the laser beam, the locus of the spot light of the laser beam becomes a locus B, and the spot light of the laser beam crosses a plurality of tracks. FIG. 4D schematically shows a spot B of a laser beam spot light that crosses between a plurality of tracks each time the optical disk 2 rotates when the optical disk 2 is greatly decentered as shown in FIG. It is shown. When the optical disc 2 is greatly decentered, as shown in FIG. 4 (d), the track a to the track d are crossed while the optical disc 2 is rotated once, and a tracking error signal is obtained as shown in FIG. 4 (b). Changes every time the tracks cross, and as shown in FIG. 4C, track cross signals having different pulse periods and pulse widths are generated. The microcomputer 12 detects the FG signal generated by the rotation of the spindle motor 4 by the FG signal detection circuit 10, measures the track cross signal with respect to the rotation angle of the optical disk 2, and tracks measured while the optical disk 2 makes one rotation. Based on the cross signal, the amplitude and period of the eccentricity of the optical disc 2 with respect to the rotation angle of the optical disc 2 are detected and stored in the built-in RAM 12b. If the eccentricity of the optical disk 2 loaded in the disk device 1 is within the standard and is not greatly decentered, the built-in RAM 12b stores that the eccentricity of the optical disk 2 is within the standard. Since the optical disk 2 is chucked unless the loaded optical disk 2 is removed from the disk device 1, the amplitude and period of the eccentricity of the optical disk 2 with respect to the rotation angle of the optical disk 2 detected once are held. Yes. Further, the detected amplitude and period of the eccentricity of the optical disk 2 includes an eccentricity amount due to an axial deviation of the spindle motor 4 of the disk device 1 and variations in chucking of the optical disk 2.
Next, the tracking pull-in operation of the optical pickup 3 when reproducing the optical disk 2 loaded on the disk device 1 will be described. When reproducing the optical disk 2, the microcomputer 12 reads the eccentricity data of the optical disk 2 stored in the built-in RAM 12b, determines whether or not the optical disk 2 has the eccentricity within the standard of the optical disk, and the disk device 1 When the optical disk 2 loaded on the optical disk 2 is eccentric more than the eccentricity of the standard of the optical disk, the microcomputer 12 reads the lens kick speed corresponding to the eccentric amplitude and period with respect to the rotation angle of the optical disk 2 stored in the built-in RAM 12b. The control equalizer data is read from the built-in ROM 12a, and the thread servo circuit 9 and the tracking servo circuit 6 are controlled. The lens kick speed control equalizer data controls the sled servo circuit 9 and the tracking servo circuit 6 to reciprocate the optical pickup 3 in the radial direction of the eccentric optical disc 2 so that the optical pickup 3 follows the track of the optical disc 2. The control data for servo-controlling the tracking of the optical pickup 3. The microcomputer 12 sends a control signal to the spindle servo circuit 5, rotates the spindle motor 4 to rotate the optical disk 2, and lens kick speed control equalizer data corresponding to the amplitude and period of eccentricity with respect to the rotation angle of the optical disk 2. The control signal is sent to the tracking servo circuit 6 and the sled servo circuit 9 based on the above, and the tracking servo circuit 6 and the sled servo circuit 9 synchronize with the amplitude and period of the eccentricity with respect to the rotation angle of the optical disc 2, and the optical pickup 3. Is reciprocated in the radial direction of the optical disc 2 to servo-control the tracking of the optical pickup 3, send a control signal to the focus servo circuit 7, and servo-control the focus of the optical pickup 3, and the optical pickup 3 is moved to the optical disc 2 To the target track of the optical disc 2 Performing tracking pull the optical pickup 3 with respect to click. Thus, even when the optical disc 2 is eccentric more than the eccentric amount of the standard of the optical disc, the tracking of the optical pickup 3 is servo-controlled in synchronization with the eccentric amplitude and period with respect to the rotation angle of the optical disc 2. Therefore, for example, in the case shown in FIG. 3, the optical pickup 3 can follow the locus A of the spot of the laser beam when the optical disc 2 is not decentered, that is, the optical pickup 3 can follow the track of the optical disc 2. The optical pickup 3 is improved in the pull-in performance during tracking pull-in, and even if the optical disc is decentered more than the decentration amount of the standard of the optical disc, the search speed is not lowered, and feed / return, cueing, etc. can be performed quickly. Can be done.
When the amount of eccentricity of the optical disk 2 is within the standard of the optical disk, the microcomputer 12 uses lens kick speed control equalizer data that controls tracking of the optical pickup 3 in accordance with the eccentricity of the optical disk stored in the built-in ROM 12a. Instead, the control signal is sent to the spindle servo circuit 5, the spindle motor 4 is rotated to rotate the optical disc 2, the control signal is sent to the sled servo circuit 9, the servo control of the sled motor 8 is performed, and the tracking servo. A control signal is sent to the circuit 6 and the focus servo circuit 7 to servo-control the tracking and focus of the optical pickup 3 so that the optical pickup 3 is moved to the target track of the optical disk 2, and the light for the target track of the optical disk 2 is detected. The tracking pull-in of the pickup 3 is performed.
Further, description will be made based on a flowchart showing the operation of detecting the amount of eccentricity of the optical disk of the disk apparatus of one embodiment of the present invention in FIG.
When the optical disk is loaded onto the disk device, the process proceeds from step S1 to step S2, and in step S2, the optical pickup is moved to a position away from the inner periphery of the optical disk by a predetermined distance to the outer periphery, and the optical disk is rotated once. The track cross signal with respect to the rotation angle of the optical disk is measured, the eccentric amount of the optical disk loaded on the disk device is detected, and the process proceeds to step S3.
In step S3, it is determined whether or not the eccentricity of the optical disk loaded in the disk device is an eccentricity within the standard of the optical disk. If the eccentricity of the optical disk is an eccentricity within the standard of the optical disk and is not greatly eccentric, Proceeding to step S4, if the eccentricity of the optical disk is larger than the eccentricity of the optical disk standard, the process proceeds to step S5.
In step S4, the fact that the amount of eccentricity of the optical disk loaded in the disk device is the amount of eccentricity within the standard of the optical disk is stored in the memory, and the process proceeds to step S6 to end the process.
In step S5, the amplitude and period of the eccentricity relative to the rotation angle of the optical disk loaded on the disk device is detected based on the track cross signal measured during one rotation of the optical disk, and the eccentricity relative to the detected rotation angle of the optical disk is detected. Is stored in the memory, the process proceeds to step S6, and the process is terminated.
Further, a description will be given based on the flowchart of FIG. 6 showing the tracking pull-in operation of the optical pickup of the disk apparatus according to the embodiment of the present invention.
When the reproduction of the optical disk is instructed, the process proceeds from step S11 to step S12. In step S12, the eccentricity data of the optical disk stored in the memory is read, and the process proceeds to step S13.
In step S13, it is determined whether or not the amount of eccentricity of the optical disk is within the standard of the optical disk. If the amount of eccentricity of the optical disk is the amount of eccentricity within the standard of the optical disk, the process proceeds to step S14, and the amount of eccentricity of the optical disk. Is larger than the eccentricity amount of the optical disc standard and not the eccentricity amount within the standard of the optical disc, the process proceeds to step S15.
In step S14, tracking of the optical pickup is normally servo-controlled, the optical pickup is moved in the direction of the target track of the optical disc, and the process proceeds to step S16.
In step S15, the tracking of the optical pickup is servo-controlled in synchronization with the amplitude and period of the eccentricity with respect to the rotation angle of the optical disk, the optical pickup is moved in the direction of the target track of the optical disk, and the process proceeds to step S16.
In step S16, it is determined whether or not the optical pickup has moved to the target track. If the optical pickup has moved to the target track, the process proceeds to step S17. If the optical pickup has not moved to the target track, step S16 is performed. repeat.
In step S17, tracking pull-in of the optical pickup with respect to the target track of the optical disk is performed, and the process proceeds to step S18 to end the process.
Although the best mode for carrying out the present invention has been described in detail above, the present invention is not limited to this, and modifications and improvements can be made within the ordinary knowledge of those skilled in the art. For example, the number of pulses of the FG signal generated by the spindle motor per revolution has been described as six pulses. However, the number of pulses of the FG signal generated by the spindle motor per revolution is not limited to this. The number of pulses may be another number of pulses.

It is a block diagram which shows the structure of the disk apparatus of one Example of this invention. It is explanatory drawing which shows the movement of the optical pick-up of the disc apparatus of one Example of this invention. It is explanatory drawing which shows the locus | trajectory of the spot light of the laser beam of the disc apparatus of one Example of this invention. It is explanatory drawing which shows the FG signal with respect to the rotation period of the optical disk of the disk apparatus of one Example of this invention, a tracking error signal, and a track cross signal. It is a flowchart which shows the operation | movement of the eccentric amount detection of the optical disk of the disk apparatus of one Example of this invention. It is a flowchart which shows the tracking pull-in operation | movement of the optical pick-up of the disc apparatus of one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc apparatus 2 Optical disc 2a Center hole 3 Optical pick-up 3a Guide shaft 4 Spindle motor 5 Spindle servo circuit 6 Tracking servo circuit 7 Focus servo circuit 8 Thread motor 9 Thread servo circuit 10 FG signal detection circuit 11 Signal processing circuit 12 Microcomputer 12a Built-in ROM
12b Built-in RAM

Claims (4)

A disk device for reproducing a video / audio signal recorded on an optical disk,
Rotation angle detection means for detecting an FG signal generated by rotation of a spindle motor for rotating the optical disk to detect the rotation angle of the optical disk, and a track cross signal with respect to the rotation angle of the optical disk detected by the rotation angle detection means is measured. A measuring means; an eccentricity detecting means for detecting the amplitude and period of the eccentricity of the optical disk relative to the rotation angle of the optical disk based on a track cross signal with respect to the rotational angle of the optical disk measured by the measuring means; and detected by the eccentricity detecting means. A storage means for storing the amplitude and period of the eccentricity of the optical disk relative to the rotation angle of the optical disk, and an optical pickup in synchronization with the amplitude and period of the eccentricity of the optical disk stored in the storage means. The optical pickup truck is moved back and forth in the radial direction of the optical disk. And control means for controlling the King,
When the optical disk is loaded onto the disk device, the eccentricity detecting means detects the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk, and stores it in the storage means. The optical pickup is reciprocated in the radial direction of the optical disc in synchronization with the amplitude and period of the eccentricity of the optical disc with respect to the rotation angle of the optical disc stored in the storage means, and tracking of the optical pickup is controlled to A disk device characterized in that a tracking pull-in of a pickup is performed. A disk device for reproducing a video / audio signal recorded on an optical disk,
Rotation angle detection means for detecting the rotation angle of the optical disk, measurement means for measuring a track cross signal with respect to the rotation angle of the optical disk detected by the rotation angle detection means, and track for the rotation angle of the optical disk measured by the measurement means An eccentricity detecting means for detecting the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk based on the cross signal, and the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk detected by the eccentricity detecting means are stored. Storage means, and control means for controlling tracking of the optical pickup in synchronization with the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk stored in the storage means,
When the optical disk is loaded onto the disk device, the eccentricity detecting means detects the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk, and stores it in the storage means. The tracking of the optical pickup is performed by controlling the tracking of the optical pickup in synchronization with the amplitude and period of the eccentricity of the optical disc with respect to the rotation angle of the optical disc stored in the storage means. A disk unit. 3. The disk apparatus according to claim 2, wherein the rotation angle detection means is a rotation angle detection means for detecting an FG signal generated by rotation of a spindle motor for rotating the optical disk to detect a rotation angle of the optical disk. The control means is a control means for controlling the tracking of the optical pickup by reciprocating the optical pickup in the radial direction of the optical disk in synchronization with the amplitude and period of the eccentricity of the optical disk with respect to the rotation angle of the optical disk. The disk device according to claim 2.

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