JP2003272185A - Optical disk apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk apparatus for obtaining a stable access operation even when a disk with a large eccentricity is reproduced at a high speed without the need for adding circuits and components. <P>SOLUTION: The optical disk apparatus prepares a process wherein eccentric component information is related to a rotary position of a spindle motor, an optimum position to tracking is decided and stored on the basis of the information, and deciding a start point of jump on the basis of the stored position and a rotary position of the spindle motor at start of seek brings a track and sled feed completion position and a tracking process position to positions at which the effect of the eccentric component is least. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording / reproducing apparatus, and more particularly to a technique for recording / reproducing an optical disc.

[0002]

2. Description of the Related Art In an apparatus for recording or reproducing information on a disc-shaped optical disc using an optical pickup, a center shift of the optical disc due to a factor at the time of manufacturing the optical disc or a spindle due to a factor at the time of manufacturing the optical disc device. Deterioration of tracking control performance due to eccentricity component generated due to misalignment between the motor shaft and the chucking part, misalignment when the disc is set in the chucking part when playing the optical disc, etc. affects playback performance. It becomes a problem. Further, in recent years, it has been required to increase the disc recording / reproducing speed for both the recording system and the reproducing system, and the influence of eccentricity is increasing with the increase in the disc rotating speed.

As a method of improving the tracking control method itself affected by the eccentricity component to reduce the effect, by rectifying the low-frequency component of the tracking drive signal as in JP-A-2000-113473. In some cases, the track pull-in operation is performed by superposing the track control voltage on the low frequency component. Further, in Japanese Patent Laid-Open No. 2000-20967, the effect is reduced by storing the eccentric component in synchronization with the rotation angle of the spindle and adding the tracking drive signal at the time of track feed and pull-in operations and the stored eccentric component. It was made.

[0004]

However, in the method of superposing the tracking drive voltage on the eccentricity component, the center of the pull-in operation is executed at a voltage value apart from the reference voltage depending on the position of the eccentricity component. . Therefore, as the eccentricity component is larger and the spindle motor rotates faster, a wider dynamic range is required for tracking drive.

In recent years, it has been required to reduce the price and power consumption of an optical disk device, and in order to achieve this purpose, the power source voltage including the actuator driver is lowered to reduce the parts cost and the power consumption of the optical disk device. The method of measuring is taken. Therefore, if the drive drive dynamic range is narrowed and deviates largely from the reference voltage of the tracking drive signal, the tracking drive voltage will exceed the output limit voltage of the actuator driver and will be clipped, and the voltage at that part will be constant. Tracking pull-in performance cannot be obtained. When performing tracking feed while performing speed control such as precision seek, compared with the voltage value required for speed control of track feed, the required energy value is large at the time of tracking pull-in and the required voltage value is also high. Even if the amount of eccentricity is such that sufficient performance can be obtained by control, sufficient performance may not be obtained during the track pull-in operation.

Further, a rough search is performed by a method such as an encoder or a step count which is interlocked with the movement of the optical pickup, without adopting the track counting method of directly counting the track crossing signal at the seek time and directly monitoring the movement of the objective lens. In this case, the deviation between the eccentric position at the start of seek and the eccentric position at the end of seek causes a large error in the actual number of jump tracks with respect to the target number of tracks. If the seek landing error becomes large, the seek is repeated to compensate for it, and the access time becomes long and the seek count becomes unstable at the same time. The influence of the eccentricity component at the time of driving such a sled could not be covered by the conventional technique.

The object of the present invention was made in view of the above problems, and the influence of the eccentricity is reduced by completing the seek feeding operation at the position where the influence of the eccentricity is the smallest on the eccentric disc. Another object of the present invention is to provide an optical disk recording / reproducing device. According to the present invention, it is possible to realize stable access without adding a dedicated circuit for realizing this function.

[0008]

In order to solve the above problems, the present invention relates the eccentricity component of the tracking drive signal to the rotational position of the spindle motor, and based on this information, stabilizes the drive signal in the vicinity of the reference voltage or the like. Then, the position where the track can be pulled in is detected and stored. By determining the jump start point based on the stored position information and the rotational position of the spindle motor at the start of seek, track and thread feed can be completed at any position such as near the reference voltage where the eccentricity component is least affected. I did it. Also, by always performing the pull-in operation near the reference voltage, stable pull-in performance can be obtained even in a system with a narrow dynamic range.

In order to achieve the object of the present invention, in the first invention, the optical disc apparatus records information on the optical disc by using the condensing means for condensing the laser beam on the optical disc, or the information is recorded on the optical disc. Optical detection means for reading information, rotation means for rotating the optical disk, rotation position measurement means for measuring the rotation position of the optical disk, and rotation position storage means for storing the rotation position measured by the rotation position measurement means. A tracking movement means for moving the focusing means in the radial direction of the optical disc, a tracking control signal generating means for generating a tracking control signal for driving the tracking movement means, and the tracking movement means for moving the tracking movement means in the radial direction of the optical disc. Sled moving means,
A tracking control signal value measuring means for measuring the tracking control signal value and a tracking control signal value storage means for storing the tracking control signal value measured by the tracking control signal value measuring means are provided, and the tracking position storage means is provided. The moving operation of the optical detecting means or the condensing means is controlled based on the information in which the stored rotational position and the tracking control signal stored by the tracking control signal value storage means are associated with each other.

According to a second aspect of the invention, in the first aspect of the invention, the memory is stored at the seek time when the focusing means or the optical detecting means is moved in the radial direction of the disc to access an arbitrary address on the optical disc. The rotation position of the optical disk at which the tracking control signal value becomes approximately zero level is stored as the movement end rotation position target, and the movement start time is set so that the rotation position of the optical disc at the end of the movement becomes the movement end rotation position target. To decide.

According to a third aspect of the invention, in the first or second aspect of the invention, the stored tracking control is performed after a time required for moving the focusing means or the optical detecting means has elapsed from the current rotational position of the optical disk. The rotation position of the optical disk where the signal value becomes approximately zero level is set as the movement end rotation position target.

According to a fourth aspect of the present invention, in the optical disc device according to the first or second aspect, the movement is started from the rotational position of the optical disc where the tracking control signal value becomes substantially zero level.

According to a fifth aspect of the invention, in the first or second aspect of the invention, the moving time is calculated based on the number of tracks from the current position to the target position on the optical disk and the control target track crossing speed during movement, and the present time is calculated. The rotation position of the optical disk at which the stored tracking control signal value becomes substantially zero level after the movement time has elapsed from the rotation position of the optical disk is set as the movement end rotation position target.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the track crossing number measuring means for measuring the number of track crossing signals generated when the optical detecting means crosses a track row on which information of the optical disc is recorded is crossed. Is provided, the eccentricity of the disk is measured by the track crossing number measuring means, and when the eccentricity is larger than a predetermined value, the rotational position stored by the rotational position storage means and the tracking control signal value storage The movement operation of the optical detecting means or the condensing means is controlled based on the information associated with the tracking control signal stored by the means.

In a seventh aspect based on the sixth aspect, when the eccentricity amount is larger than a predetermined value, the rotational position of the optical disk where the stored tracking control signal value becomes substantially zero level is moved. It is stored as the end rotational position target,
The start time of the movement is determined so that the rotation position of the optical disk at the end of the movement becomes the movement end rotation position target.

According to an eighth aspect of the present invention, in the fifth aspect, the track crossing number measuring means for measuring the number of track crossing signals generated when the optical detecting means crosses a track row on which information of the optical disc is recorded is crossed. Then, a track crossing number storage means for storing the measured track crossing number is provided, and the moving time is corrected based on the stored track crossing number.

In a ninth aspect based on the eighth aspect, the eccentricity amount of the disk is measured by the track crossing number measuring means, and when the eccentricity amount is larger than an arbitrary value, the rotational position storing means. The movement operation of the optical detecting means or the condensing means is controlled on the basis of the information in which the rotational position stored by the tracking control signal and the tracking control signal stored by the tracking control signal value storage means are associated with each other.

According to a tenth invention, in the ninth invention,
When the eccentricity amount is larger than a predetermined value, the rotation position of the optical disk at which the stored tracking control signal value becomes approximately zero level is stored as a movement end rotation position target, and The start time of the movement is determined so that the rotation position becomes the movement end rotation position target.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings using examples. FIG. 1 is a block diagram showing an embodiment of an optical disk device according to the present invention. In the figure, the optical pickup 101 irradiates the optical disc 102 with a laser through the objective lens 112, converts the reflected light into a current by a photodetector (not shown) incorporated in the optical pickup 101, and outputs a current signal 103. The current signal 103 is converted into a voltage signal 105 by the current-voltage conversion circuit 104, and the focus error detection circuit 10
6, tracking error detection circuit 107, RF amplification circuit 1
08 is transmitted to each.

A focus error signal 109 detected by the focus error detection circuit 106 is applied to a focus actuator (not shown) incorporated in the pickup 101 via an actuator control circuit 110 and an actuator driver 111 to control an objective lens 112 in the focus direction. Then, the focus servo loop is formed.

The tracking error signal 113 detected by the tracking error detection circuit 107 is applied to a tracking actuator (not shown) incorporated in the pickup 101 via the actuator control circuit 110 and the actuator driver 111, and the objective lens 112 is moved in the tracking direction. Control to form a tracking servo loop. Further, in order to measure the tracking drive signal in the present invention, the input signal 116 to the actuator driver 111 is transmitted to the A / D converter built in the system controller 114. Further, the track crossing signal 117 obtained by binarizing the tracking error signal 113 by the binarizing circuit 115 is transmitted to the system controller 114. Further, the tracking error signal 113 is transmitted to the system controller 114 to generate the control signal 121 for controlling the stepping control circuit 118 that controls the sled.

The voltage signal 105 is supplied to the RF amplification circuit 108, and the RF amplification circuit 108 generates a signal representing the information recorded on the optical disc 102 as a reproduction RF signal 123 to demodulate the circuit 124 and the spindle control circuit 125.
Communicate to. The signal 129 representing the disc information demodulated by the demodulation circuit 124 is the system controller 11
4 is transmitted. Spindle control circuit 125 is a reproduction RF
According to the signal 123 or the spindle control signal 126 output from the system controller 114, the rotation of the spindle motor 128 is controlled via the spindle driver 127 to rotate the optical disc 102. The spindle motor driver 127 detects the rotation status of the spindle motor 128, and outputs the detection result as the FG signal 122 to the system controller 114 and the spindle control circuit 1.
25.

During reproduction, the system controller 114 detects the tilt of the objective lens 112 by the low frequency component of the tracking error signal 113, and performs tracking transmission based on the FG signal 122 and the demodulated signal 129 representing the disc information. The speed is detected, and a reproduction stepping control signal 121 is generated based on the detected information and transmitted to the stepping control circuit 118. Further, the system controller 114 has a speed profile for thread seek control in a built-in memory, generates a seek stepping control signal 121 for seeking the optical pickup 101 in the radial direction based on the speed profile, and generates a stepping control circuit 118.
Communicate to. The stepping control circuit 118 controls the rotation of the stepping motor 120 via the stepping motor driver 119, and drives the optical pickup 101 in the radial direction of the optical disc via the drive screw of the motor 120.

The actuator control circuit 110 has an auto sequence function having a mechanism for sending a track while controlling the track speed in the radial direction of the optical disc 102 and a mechanism for executing a tracking pull-in, and a control signal output from the system controller 114. Upon receiving an instruction to execute a jump operation and a tracking pull-in operation by 130, the auto sequence function is activated.

FIG. 2 is a diagram for explaining an embodiment of a method of measuring the eccentricity component information in the optical disc device shown in FIG. 1, and FIG. 2A shows a tracking drive signal when the disc is rotated once. 2B is a diagram showing sampling timing of the tracking drive signal shown in FIG. 2B,
FIG. 2C is a waveform diagram showing the FG signal, and FIG.
Is a diagram showing the memory B, FIG. 2 (e) is a diagram showing the memory A,
FIG. 2F is a diagram showing a pointer position showing the zero level of the tracking drive signal, and FIG. 2G is a waveform diagram of sampling the tracking drive signal.

The FG signal 122 of FIG. 2 (c) of this embodiment is a pulse of 6 times per one rotation of the spindle. The sampling timing shown by the arrow 201 in FIG. 2B is obtained by further dividing one FG signal. Here, the number of divisions is 4, and the sampling timing is FG signal 12
2 falling edge and spindle 1 from the falling edge
The points are separated by a time that is 1, 2, or a multiple of rotation period / (6 × 4). Sampling timing 2 in FIG. 2B
The memory A of FIG. 2E and the memory B of FIG. 2D are allocated for each 01.

Now, the relative relationship between the eccentricity component and each edge of the FG signal is maintained as long as chucking is maintained,
The influence amount of eccentricity does not change significantly if the rotation speed of the spindle is the same. Therefore, this eccentricity component measurement is performed only once when the speed becomes stable after the rotation starts from the spindle stopped state. Whenever the target speed of the spindle motor is changed, the measurement is performed again when the speed stabilizes.

When the rotation is started from the spindle stopped state,
Label names a to n to x are assigned to the memory A in order from an arbitrary reference position (0 degree) according to each edge of the FG pulse and the sampling timing between the edges. As described above, since the relative relationship between the eccentricity component and the FG signal is maintained as long as the chucking is not displaced, the relative positional relationship between the label name and the FG signal is also maintained.

When the optical disk 102 is rotated once, the tracking drive signal becomes a straight line when there is no eccentricity, but when it is eccentric, as shown in FIG. 2A, when the track servo is turned on. The tracking drive signal 202 is obtained. This tracking drive signal 202 is shown in FIG.
Sampling is performed at the sampling timing 201 in (b), and the A /
The measured value TDsmpl203 of FIG. 2 (g), which is digitized by the D converter, corresponds to the label a to the memory A.
Store in x.

The sine waveform of the tracking drive voltage is obtained from the measurement result stored in the memory A of FIG. 2E, and the two points at which the tracking drive voltage 203 is closest to the reference voltage 0, that is, the value of the tracking drive voltage 203. Is reduced and the tracking drive voltage 203 gradually increases in the positive direction, and the point PA2 at which the tracking drive voltage 203 becomes substantially zero is obtained. Here, the point PA1 is the label m and the point PA2 is the label a. The memory B shown in FIG. 2 (d) will be described each time because it is used during the precision seek, and the description thereof is omitted in FIG.

FIG. 3 is a flow chart showing an embodiment of the processing operation at the time of access of the optical disk device according to the present invention. One track (Tr) which is an element constituting the access.
The operation processing adapted to each of jump, precision seek, and coarse seek is shown. At the start of the jump, first, in step 131, it is confirmed whether or not the eccentricity component information has been acquired. If not acquired, the process proceeds to step 132, and the eccentricity component information described in FIG. 2 is measured. That is, the actuator driver input signal input to the system controller 114 is stored in the memory for one rotation of the disk motor, and the point PA1 and the rising point PA2 closest to the reference voltage 0 level are obtained. The point obtained at this time becomes the jump landing target position. In the example of FIG. 2, PA1, PA2
The labels of the memory A are as a and m. Next, at step 133, the type of jump to be executed is confirmed. If it is a rough seek, the routine proceeds to step 142, and otherwise it proceeds to step 134.

At the time of 1Tr jump and precision seek, first, in step 134, the current position information synchronized with the FG signal 122 input to the system controller 114 is acquired. That is, the position of the current position a to x in the memory A is acquired. In step 135, the start position of the jump is determined based on the current position information and the landing target position points PA1 and PA2 of the jump. Next, in step 136, the FG signal 122 input to the system controller 114 is monitored, and the jump start position determined in step 135 is waited for. When the start position is reached, the process moves to step 137 and the system controller 114
From the actuator control circuit 11 via the control signal 130
Issue a jump command to 0. During the jump, it is confirmed in step 138 whether the seek is a precision seek. If the seek is a precision seek, the eccentricity information during the jump is acquired in step 139. The number of track crossing signals 117 input to the system controller 114 is stored in a built-in memory in synchronization with the FG signal 122. The information stored in step 139 is used when the jump start position is determined in step 135. After the jump command is issued, the end of the jump process is confirmed in step 140, and when the jump is completed, the process proceeds to the track pull-in process of step 141.

In the case of a rough seek (YES) in step 133, the process moves from step 133 to step 142, and the current position information in the memory A synchronized with the FG signal 122 input to the system controller 114 is acquired. Next, at step 143, it is judged whether or not the current FG position has reached the landing target position PA1 or PA2 of the jump. If not, step 142 and step 14
Loop 3 In step 143, the landing target position PA
When you reach 1 or PA2, PA1 or PA2
Which of the two has started the jump is stored in the memory incorporated in the system controller 114, and step 144
When the process shifts to, the coarse seek stepper feed for controlling the stepping control circuit 118 via the stepping control signal 121 from the system controller 114 is started. After the stepper feeding is started, the end of the stepper feeding is confirmed in step 145, and when the stepper feeding is completed, the process proceeds to step 146. This stepper feed is completed by the stepper motor feed (rotation speed)
It can be understood by measuring. In step 146, the FG signal 1 input to the system controller 114 again
The current position information synchronized with 22 is acquired. Next, in step 147, it is confirmed whether or not the current FG position has reached either PA1 or PA2 which was stored in the memory and started in step 143. If not reached, steps 146 and 147 are looped. Step 143
When PA1 or PA2 started in step S1 is reached, the process proceeds to step 148 for track pull-in.

The case where the present embodiment is applied to each of 1Tr jump, precision seek, and rough seek after the acquisition of the eccentricity component information will be described below with reference to FIGS.

FIG. 4 is a timing waveform diagram for explaining one embodiment of the one-track jump in the optical disc device shown in FIG. 1. FIG. 4A is a waveform showing a tracking drive signal when the disc makes one round. FIG. 4 (b) is a waveform diagram showing the tracking error signal, FIG. 4 (c) is a diagram showing sampling timing of the tracking drive signal,
4 (d) is a waveform diagram showing the FG signal, FIG. 2 (e) is a diagram showing the memory B, FIG. 2 (f) is a diagram showing the memory A, and FIG.
(G) is a diagram showing a pointer position indicating the zero level of the tracking drive signal.

FIG. 4A shows the tracking drive signal 202.
4B shows the tracking error signal 113. An arrow 401 on the tracking drive signal 202
From the start of the 1Tr jump shown by, the arrow 4 indicates by the label of the memory A assigned to the FG signal 122 in FIG.
The current position is recognized as indicated by 02. Here, the label j of the memory A is used. Furthermore, jump points are also calculated.

The time from the jump start of the 1Tr jump to the track pull-in is the jump command issuance time and the kick and brake time for the track drive signal to execute the track crossing for 1Tr. The jump command issuance time is Ta1 regardless of the servo status.
Becomes The time required for kicking and braking the track is set to a fixed time Ta2 when the track is driven at the position closest to the reference voltage. Therefore, the time required for the jump is (Ta1 + Ta2).

Here, the jump point P in FIG.
From A1 or PA2, from the current position j (Ta1 +
After the lapse of Ta2), the closest one is selected as the landing position.
Since the label is k after (Ta1 + Ta2), the point PA1 closest to the label k is selected.

Therefore, from point PA1 to (Ta1 + T
a2) If the one-track (Tr) jump is started from the point a time before, the pull-in point can be synchronized with the point PA1. If the time from the current position label j to the point PA1 is Ta, the wait time Tw from the current position to the start of the jump is Tw = Ta− (Ta1
+ Ta2), the Tw time is waited from the current position, and then the jump command is issued as indicated by arrow 403, whereby the track pull-in can be performed at the timing closest to the reference voltage of the tracking drive waveform.

FIG. 5 is an operation timing waveform diagram when the present embodiment is applied at the time of precision seek. FIG. 5A is a waveform diagram showing a tracking drive signal when the track servo is on, and FIG. 5B is a waveform diagram showing a tracking error signal.
FIG. 5C is a diagram showing the sampling timing of the tracking drive signal, FIG. 5D is a waveform diagram showing the FG signal,
FIG. 5E is a diagram showing the memory B, and FIG. 5F is a memory A.
FIG. 5 (g) is a diagram showing the pointer position indicating the zero level of the tracking drive signal.

Tracking error signal 1 shown in FIG.
At 13 between the arrows Ts1 and Ts2, the track servo is off due to the precise seek. In the precision seek, the optical pickup and the objective lens are moved in the radial direction of the disc by an arbitrary number of target tracks by track counting. Simultaneously with the tracking drive, the stepping motor is driven to move the pickup, but since the track is directly counted, the influence of the eccentricity component on the seek distance accuracy is small and can be sufficiently ignored.

The time from the jump start of the precision seek to the track pull-in shown by the arrow 501 is the time required to issue the precision seek command and the track feed for the target number of tracks. The command issuing time is Ts1 regardless of the servo state. The time required for the track feed is set to Ts2 which is determined by the control target speed of the track feed and the fluctuation value of the feed speed due to the eccentric component. Therefore, the time required for the jump is Ts1 + Ts2.

The variable values of the feed speed are stored in the memory B shown in FIG. 5E by allocating the label names a to n to x in order from the reference position (0 degree) between the sampling points 201 of the FG signal 122. During the track seek operation of the precision seek, the value obtained by binarizing the tracking error signal 113 crossing between the sampling points by the binarizing circuit 115 and weighting the counted value of the track crossing signal 117 is added to or subtracted from the value of the memory B. By doing so, learning of the memory B is executed. The ratio of the number of counts obtained from the target speed of the speed control of the precise seek to the theoretical value is the deviation. In actual learning, reliable learning can be performed by starting counting after waiting for a time that is expected to stabilize the track speed from the start of the track jump. Since the region corresponding to all sampling points cannot be learned with one seek, learning is performed every precision seek. Since this learning is performed during the jump, it does not affect the access time.

First, an arrow 501 is a point at which a jump is started by a command from the microcomputer. From the start of the precision seek shown by the arrow 501, the current position is recognized as shown by the arrow 502 by the label assigned to the FG signal 122 in FIG. 5D. The current position here is the label a. Further, the jump start point (jump command issue point) is also calculated. After the wait time Tw elapses from the label a, a jump is started as shown by an arrow 503, and the feed time Ts when the eccentricity is 0 calculated from the target speed of the speed control.
2a is corrected by the value of the deviation memory B of the area passing after the passage of Ts1 from the label a to obtain Ts2.

Here, the jump point P of FIG.
From the current position label a of A1 or PA2 (Ts
After 1 + Ts2), the closest one is selected. After (Ts1 + Ts2) has passed from the label a, since the label is k, the point PA1 is selected.

Therefore, from point PA1 to (Ts1 + T
s2) If the precise seek jump is started from the point before the time, the pull-in point can be synchronized with the point PA1. Assuming that the time from the current position label a to the point PA1 is Ts, the wait time Tw from the current position to the start of the jump is Tw = Ts− (Ts1 + Ts
2), the Tw time is waited from the current position label a and then the jump command is issued, whereby the track pull-in can be performed at the timing closest to the reference voltage 0 level of the tracking drive waveform.

FIG. 6 is an operation timing waveform diagram when the present embodiment is applied during the rough seek. 6A is a waveform diagram showing a stepping pulse, FIG. 6B is a waveform diagram showing a tracking drive signal, and FIG. 6C is an FG signal waveform diagram showing sampling timing of the tracking drive signal. In the figure, coarse seek converts a desired number of target tracks into a step number by driving a stepping motor, and moves the optical pickup stepwise in the radial direction of the disc. Therefore, an error occurs between the actual number of track feeds and the target number of track feeds due to the difference between the eccentric position at the start of step driving and the eccentric position at the end of step driving.

First, from the start of the rough seek shown by the arrow 601, similarly to the 1Tr jump and the precise seek described above, FIG.
The arrow 60 is given by the label assigned to the FG signal in (c).
The current position is recognized as indicated by 2. Furthermore, the point closest to the current position is selected from the points PA1 or PA2, and when the selected point is reached, the arrow 60
As shown in 3, the stepper feeding is started. The arrow 603 is located at PA1 in FIG. 6 (b). Next, arrow 604
After the step feed is completed, the same point PA1
By starting the pull-in at, the start point and the end point of the rough seek become the point PA1 at the same eccentric position. Therefore, the start and the end of the rough seek are at the same eccentric position, and the error due to the eccentric component between the actual track feed number and the target track feed number can be suppressed.

At the same time, since the point near the reference voltage 0 level is set as the pull-in timing, the track pull-in can be performed at the timing closest to the reference voltage of the tracking drive waveform. When step feed is started at point PA2, track pull-in is similarly started at point PA2.

In this embodiment, an example in which a stepping motor is used for rough seek has been described, but this embodiment can be applied to rough seek that does not depend on track count such as counting by an encoder. Further, even in the system using the track count for the rough seek, the embodiment for 1Tr and the fine seek can be similarly applied, and the same embodiment can be applied for the rough seek at the time of pulling in.

Further, in the system of this embodiment, the eccentricity amount can be measured by measuring the number of tracks of the track crossing signal 117 during the tracking servo loop off. Depending on the eccentricity amount, when the eccentricity amount has a small influence even at high speed rotation, the specific gravity can be shifted from the access stability to the access time performance by not performing all or part of the present invention. .

Further, in the present embodiment, the number of track crossing signals generated when crossing the track train in which the information of the optical disk is recorded is measured, and the eccentricity of the disk is measured by measuring the number of track crossing. However, when the eccentricity amount is larger than a predetermined value, the movement of the optical pickup is performed based on the information in which the rotational position stored by the rotational position storage memory and the tracking control signal stored in the tracking control signal value storage memory are associated with each other. The operation may be controlled.

As described above, according to the present invention, it is possible to add a circuit or a component to a standard optical disk device,
A stable access operation can be obtained even when a disc with large eccentricity is played back at high speed. In addition, even in a system having a narrow dynamic range of the tracking drive signal, the performance of the present invention can be similarly obtained.

By implementing the present invention, the access time is delayed due to the time lag at the time of measuring the eccentricity component and at the time of waiting for the jump point, but a stable jump is realized and an unstable track flow recovery process or the like is realized. By reducing the frequency of time processing, the access time can be shortened as compared with the case where the present invention is not applied. Also,
Since each time lag is based on the rotation cycle of the disk motor, the faster the rotation speed of the disk motor, the smaller the influence of the time lag and the greater the effect of the invention.

[0055]

As described above, according to the present invention, a stable access operation can be obtained even when a disc with a large eccentricity is reproduced at high speed without adding a circuit or parts to the standard optical disc device. . In addition, a stable access operation can be obtained even in a system having a narrow dynamic range of the tracking drive signal.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an optical disc device according to the present invention.

FIG. 2 is a diagram for explaining an embodiment of a method for measuring eccentricity component information in the optical disc device shown in FIG.

FIG. 3 is a flowchart showing an embodiment of a processing operation at the time of access of the optical disk device according to the present invention.

4 is a timing waveform chart for explaining an embodiment of a one-track jump in the optical disc device shown in FIG.

FIG. 5 is an operation timing waveform diagram when the present embodiment is applied during precision seek.

FIG. 6 is an operation timing waveform diagram when the present embodiment is applied at the time of rough seek.

[Explanation of symbols]

101 ... Optical pickup, 102 ... Optical disk, 103
... photodetector current output signal, 104 ... current-voltage conversion circuit,
105 ... Photodetector voltage output signal, 106 ... Focus error detection circuit, 107 ... Tracking error detection circuit, 10
8 ... RF amplifier circuit, 109 ... Focus error signal, 11
0 ... Actuator control circuit, 111 ... Actuator driver, 112 ... Objective lens, 113 ... Tracking error signal, 114 ... System controller, 115 ... 2
Quantization circuit, 116 ... Actuator driver input signal,
117 ... Track crossing signal, 118 ... Stepping control circuit, 119 ... Stepping motor driver, 120
... Stepping motor, 121 ... Stepping control signal, 122 ... Spindle FG signal, 123 ... Reproduction RF signal, 124 ... Demodulation circuit, 125 ... Spindle control circuit,
126 ... Spindle control signal, 127 ... Spindle motor driver, 128 ... Spindle motor, 129 ... Demodulation signal, 130 ... Auto sequence control signal.

Claims (10)

[Claims] 1. An optical detecting means for recording information on an optical disc or for reading information recorded on the optical disc by using a condensing means for condensing a laser beam on the optical disc, and a rotating means for rotating the optical disc. Rotational position measuring means for measuring the rotational position of the optical disk, rotational position storage means for storing the rotational position measured by the rotational position measurement means, and tracking moving means for moving the condensing means in the radial direction of the optical disk. A tracking control signal generating means for generating a tracking control signal for driving the tracking moving means, a sled moving means for moving the tracking moving means in the radial direction of the optical disc, and a tracking control signal value measurement for measuring the tracking control signal value. Means, and the tracking control measured by the tracking control signal value measuring means. Tracking control signal value storage means for storing a signal value, and the optical system based on information in which the rotational position stored by the rotational position storage means and the tracking control signal stored by the tracking control signal value storage means are associated with each other. An optical disk device characterized by controlling the moving operation of the dynamic detecting means or the condensing means. 2. The optical disk device according to claim 1, wherein the light-collecting means or the optical detecting means is moved in a radial direction of the disk to access an arbitrary address on the optical disk, and the data is stored. The rotation position of the optical disk at which the tracking control signal value becomes approximately zero level is stored as the movement end rotation position target, and the movement start time is set so that the rotation position of the optical disc at the end of the movement becomes the movement end rotation position target. An optical disk device characterized by determining. 3. The optical disk device according to claim 1, wherein the stored tracking control signal is obtained after a time required for moving the focusing means or the optical detecting means has elapsed from a current rotational position of the optical disk. An optical disk apparatus, wherein a rotational position of an optical disk whose value is substantially zero level is set as a target of the movement end rotational position. 4. The optical disk device according to claim 1 or 2, wherein the optical disk device is started to move from a rotational position of the optical disk where the tracking control signal value becomes substantially zero level. 5. The optical disk apparatus according to claim 1, wherein the moving time is calculated based on the number of tracks from the current position to the target position on the optical disk and the control target track crossing speed during movement, An optical disk device, wherein the rotational position of the optical disk, at which the stored tracking control signal value becomes approximately zero level after the movement time has elapsed from the rotational position of the optical disk, is the movement end rotational position target. 6. The optical disk apparatus according to claim 1, wherein the optical detecting means measures the number of track crossing signals generated when the optical detecting means crosses a track train in which information of the optical disk is recorded, and the number of track crossing signals is measured. Is provided, the eccentricity of the disk is measured by the track crossing number measuring means, and when the eccentricity is larger than a predetermined value, the rotational position stored by the rotational position storage means and the tracking control signal value storage An optical disk device, characterized in that the movement operation of the optical detecting means or the condensing means is controlled based on information associated with the tracking control signal stored by the means. 7. The optical disk device according to claim 6, wherein when the eccentricity amount is larger than a predetermined value, the rotational position of the optical disk where the stored tracking control signal value is substantially zero level is moved. An optical disk device, characterized in that it is stored as an end rotational position target, and the start time of the movement is determined so that the rotational position of the optical disk at the end of the movement will be the movement end rotational position target. 8. The optical disk device according to claim 5, wherein the optical detecting means measures the number of track crossing signals generated when the optical detecting means crosses a track train in which information of the optical disk is recorded, and the number of track crossing signals is measured. An optical disk device comprising: a track crossing number storage means for storing the measured track crossing number; and correcting the moving time based on the stored track crossing number. 9. The optical disk device according to claim 8, wherein the eccentricity of the disk is measured by the track crossing number measuring means, and when the eccentricity is larger than an arbitrary value,
Controlling the movement operation of the optical detecting means or the condensing means on the basis of information in which the rotational position stored by the rotational position storage means and the tracking control signal stored by the tracking control signal value storage means are associated with each other. An optical disk device characterized by. 10. The optical disk apparatus according to claim 9, wherein when the eccentricity amount is larger than a predetermined value, the movement of the rotational position of the optical disk where the stored tracking control signal value becomes substantially zero level is completed. An optical disk device, characterized in that it is stored as a rotational position target, and the movement start time is determined so that the rotational position of the optical disk at the end of the movement becomes the movement end rotational position target.