JPH09120549A - Tracking control method for optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shift stably and at high speed from a track jump to the tracking settlement and tracking servo-on state by obtaining a tracking drive output by adding a kick pulse signal or a brake pulse signal based on a position of a spot just prior to the track jump. SOLUTION: A detected tracking error signal from an optical pickup is subjected to low band processing and high band processing by an LPF 1 and an HPF 5 respectively and then addition by a servo adder 2 to perform a phase compensation. This tracking error signal is calculated by an LPF 6 via a servo multiplier 3 to obtained an average value of a low band component, which is then held by a kick-hold circuit 7. Subsequently, the kick pulse signal or the brake pulse signal from a microcomputer is added to the output value held by the circuit 7 by a kick adder 8 to obtain the tracking drive output.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD (Compact Di
sc), MD (Mini Disc), VD (Video Disk), or the like, and a tracking control method of an optical disc device for optically reading a signal recorded on an optical disc.

[0002]

2. Description of the Related Art A tracking servo device of an optical disk device for optically reading a signal recorded on an optical disk is
It is a device for tracking servo so that a signal can be read along a track of an optical disk.

By the way, the above tracking servo is
The laser light emitted from the optical pickup is operated after the spot focused on the disk surface moves to a predetermined track, and the movement period to the predetermined track,
That is, the tracking servo is OFF when the track jump is performed.

That is, as shown in FIG. 2 which is an explanatory view of the present invention, when the spot 20 deviates from a predetermined track, the spot 20 generally moves at a predetermined speed in a direction perpendicular to the track. Then reach either track. When the movement of the spot 20 is braked and the spot 20 is located near the track N, for example, the normal tracking servo can be turned on.

However, in this case, even if the spot 20 is located near the track N, if the moving speed is high, the tracking servo cannot be turned on. This is because even if the tracking servo is momentarily applied,
This is because it will soon be off the track.

Therefore, it is necessary to apply an appropriate braking force to the spot 20, but in order to determine the braking force, two parameters, that is, the speed at which the disc surface of the spot 20 moves and the current position are set. Without it, the proper braking force cannot be determined.

As a conventional technique relating to control when the track jump is shifted to the normal tracking servo ON state, for example, Japanese Patent Laid-Open No. 61-253677,
JP-A-63-144429, JP-A-2-6273
No. 0 and Japanese Patent Laid-Open No. 5-282681.

In the above-mentioned Japanese Patent Laid-Open No. 61-253677, if the spot is located between the tracks N and N + 1, the spot is controlled so as to be returned in the direction of the track N. That is, the technique disclosed in this publication adjusts the braking force according to the position of the spot.
However, in the technique of this publication, the braking force works only in one direction. Therefore, it has a problem that it is easy to run away, that is, slippery. In the above example, track N-
It is easy to slip in the direction of 1.

That is, as described above, originally, the magnitude of the braking force cannot be determined unless the position and speed of the spot are known. Also, it should be considered that the track itself has a velocity due to the eccentricity of the optical disc. Furthermore, it cannot be applied to so-called virgin tracks where no RF signal is present.

Further, the above-mentioned Japanese Patent Laid-Open No. 63-144429 discloses a tracking control suitable for forming a wobbling pit in the servo area of an optical disk and detecting the wobbling pit for fast pull-in. ing.

However, the technique disclosed in this publication cannot be used unless the optical disc has wobbling pits formed in the servo area.

Further, in the above-mentioned Japanese Patent Laid-Open No. 2-62730, 6 to 9 positions of the spot with respect to the track are detected, and two directions are detected. Then, the braking force is determined according to the combination state of these, thereby providing the tracking control in which the pull-in time is short.

The disclosed technique has some effect because it considers the position and direction of the spot, but it is still insufficient because it does not consider velocity. In addition, the processing is very complicated, and a dedicated high speed DSP is required.
Furthermore, the step amount is large.

Next, in the above-mentioned Japanese Patent Laid-Open No. 5-282681, it is considered that the track-to-track moving speed becomes low when the tracking error signal is within a predetermined level and the state continues for a certain time. Then, at this time, the tracking servo is turned on.

As a result, even a virgin truck can be reliably pulled into a desired track. Further, in this method, the speed and position of the spot are detected to some extent. Also, eccentricity is taken into consideration.

However, the technique disclosed in this publication has to wait until the timing at which the tracking servo can be reliably pulled into the ON state, and there is no mention of a brake for pulling at high speed. Further, the speed detection method in the technique of this publication is conditioned on that the tracking error signal has a certain width for a certain fixed time, and the speed is not directly detected. Therefore, the accuracy of speed detection becomes insufficient. For example, when the tracking error signal oscillates within a certain width, the speed is detected as small even though the actual speed is large. doing.

[0017]

As described above, in the above-described conventional tracking control method for the optical disk device, both the two parameters of the track-to-track moving speed and the position are not taken into consideration, or even if they are taken into consideration. It requires very complicated control. And because the control is rough, it is easy to run out of control, it takes time to pull in,
It has a problem that the algorithm is very complicated.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to relatively quickly and stably perform tracking pull-in from a track jump and a tracking servo ON state. An object of the present invention is to provide a tracking control method for an optical disk device that can be moved.

[0019]

According to a first aspect of the present invention, there is provided a tracking control method for an optical disk device, wherein, in order to solve the above-mentioned problems, tracking servo is performed by a tracking drive output based on a tracking error signal while a kick pulse signal is generated. Alternatively, in a tracking control method for an optical disc device that performs a track jump or a track pull-in by a tracking drive output based on a brake pulse signal, a low frequency component of the tracking drive output immediately before the track jump is held during the track jump, and a kick pulse is included in the holding signal. It is characterized in that a tracking drive output is obtained by adding a signal or a brake pulse signal.

That is, in the track jump,
It is applied as a tracking drive output based on the kick pulse signal or the brake pulse signal.

At this time, according to the above method, the low frequency component of the tracking drive output immediately before the track jump is held, and the kick pulse signal or the brake pulse signal is added to the held signal to provide the tracking drive output.

Therefore, conventionally, no matter where the spot position is,
Since the kick pulse signal or the brake pulse signal of the same magnitude was applied as the tracking drive output,
Although it was a cause of control instability, in the present invention, a kick pulse signal or a brake pulse signal is added based on the position of the spot immediately before the track jump and applied as a tracking drive output, so that the track can be tracked at high speed and stably. It is possible to shift from the jump to the tracking pull-in and the tracking servo ON state.

In addition, the control can be achieved by a relatively easy method with almost no increase in processing.

In order to solve the above-mentioned problems, a tracking control method for an optical disk device according to a second aspect of the present invention performs tracking servo by a tracking drive output based on a tracking error signal, while based on a kick pulse signal or a brake pulse signal. In a tracking control method of an optical disk device for performing track jump or track pull-in by a tracking drive output,
When the track is pulled in after applying the brake pulse signal, the tracking servo is performed within a predetermined vicinity of the on-track, and the tracking drive output based on the low frequency component of the tracking drive output when the track deviates from the vicinity of the predetermined on-track outside the predetermined vicinity of the on-track. Characterized by giving.

According to the above-mentioned method, when the application of the brake pulse signal in the track jump is completed and the process moves to the track pull-in stage, when the spot deviates from the vicinity of the predetermined on-track, the tracking drive output is low immediately before the deviating. A tracking drive output is provided based on the band component.

Therefore, since the tracking drive output is given based on the position and speed of the spot, the tracking pull-in and the tracking servo ON state can be achieved at high speed and stably.

In order to solve the above-mentioned problems, a tracking control method for an optical disk device according to a third aspect of the present invention is the tracking control method for an optical disk device according to the second aspect, wherein the tracking drive is provided outside the vicinity of the on-track. The output is twice or 4 times the low-frequency component of the tracking drive output when it goes out of the vicinity of the on-track.
It is characterized in that it is a signal holding a doubled value.

According to the above-mentioned method, when the application of the brake pulse signal in the track jump is completed and the process moves to the track pull-in stage, when the spot deviates from the predetermined vicinity of the on-track, the output of the tracking drive immediately before deviating. Low frequency component retention is 2x or 4x
Can be adjusted in stages.

As a result, the tracking drive output when the spot deviates from the vicinity of the predetermined on-track can be adjusted in two steps.

Therefore, it is possible to perform the tracking control with high accuracy when shifting to the track pull-in stage.

According to a fourth aspect of the present invention, there is provided a tracking control method for an optical disk apparatus, which solves the above-mentioned problems by performing tracking servo by a tracking drive output based on a tracking error signal, while based on a kick pulse signal or a brake pulse signal. In a tracking control method of an optical disk device for performing track jump or track pull-in by a tracking drive output,
The low-frequency component of the tracking drive output immediately before the track jump is held, and when the tracking servo is performed after the track is pulled in, the tracking servo is started using the held signal as an initial value.

According to the above method, when shifting to the tracking servo after the track pull-in, the low frequency component of the tracking drive output immediately before the track jump is given as the tracking output in the tracking servo.

Therefore, in the case of an optical disc with a large amount of eccentricity, the continuity of the tracking servo operation is improved and the shock can be alleviated. As a result, it is possible to smoothly start the tracking servo when the tracking servo shifts.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the tracking control circuit of the optical disk device according to the present embodiment has an LPF (Low
Pass Filter) 1, servo adder 2, servo multiplier 3 and jump changeover switch 4 are respectively connected in series, and a tracking error signal is inputted to the LPF 1 while a tracking drive output is taken out from the jump changeover switch 4. It is supposed to be.

The LPF 1 has an HPF (High Pass F
ilter) 5 are connected in parallel, whereby the tracking error signal passes through the LPF 1 and HPF 5 and is added by the servo adder 2.

Further, the jump changeover switch 4 can be changed over from the 0 side to the 1 side by a jump signal output from an external microcomputer (not shown).

On the other hand, the output of the servo multiplier 3 is branched and connected to the LPF 6. A kick hold circuit 7, a kick adder 8 and a slip prevention changeover switch 9 are sequentially connected to the LPF 6, and the output terminal of the slip prevention changeover switch 9 is 1 of the jump changeover switch 4 described above.
Connected to the side terminal.

The kick adder 8 is adapted to add a kick pulse signal from a microcomputer (not shown). Further, the anti-slip selector switch 9 is turned on from the 0 side by the anti-slip signal output from the microcomputer (not shown).
It can be switched to the side.

Further, a multiplier 10 and a multiplier 11 are connected in parallel to the output side of the LPF 6, and the outputs of the multipliers 10 and 11 are respectively the 0 side terminal of the magnification changeover switch 12 and the output. It is connected to the 1 side terminal. The magnification changeover switch 12 can be switched between the 0 side and the 1 side by a GUP signal from a microcomputer (not shown).

The output of the magnification changeover switch 12 is connected to the 1-side terminal of the pull-in servo changeover switch 14 via the hold circuit 13. The output of the servo multiplier 3 is connected to the 0 side terminal of the servo changeover switch 14 during pull-in. The pull-in servo selector switch 14 can be switched between the 0 side and the 1 side by a signal TCRS from a microcomputer (not shown).

Further, the servo changeover switch 14 at the time of retracting
The output terminal of is connected to the one-side terminal of the slip prevention changeover switch 9.

In the tracking control circuit having the above-mentioned configuration, the tracking servo is turned on, the track jump or the track jump is performed by switching the jump changeover switch 4 by the jump signal from the microcomputer and the slip prevention changeover switch 9 by the slip prevention signal from the microcomputer. It can be switched to three modes of track pull-in.

Table 1 summarizes the jump changeover switches 4 and the changeover modes of the jump changeover switches 4 in each mode.

[0045]

[Table 1]

The operation of the tracking control circuit in each mode will be described. First, the operation in the normal tracking servo ON state will be described. First, as shown in FIG. 1, a tracking error signal detected from an optical pickup (not shown) is low-pass processed and high-pass processed by the LPF 1 and HPF 5. The signals passed through the LPF 1 and the HPF 5 are added by the servo adder 2 and the phase is compensated by this.

Next, the added signal is added to the servo multiplier 3
Is multiplied by TG at and is output as a tracking drive through the jump changeover switch 4.

This tracking drive output is supplied as a control signal to an external tracking actuator driver (not shown) to drive the tracking actuator of the optical pickup. By this series of operations, the spot 20 traces on the track N, for example, as shown in FIG.

Next, a track jump, that is, an operation for moving the spot 20 from another track to a predetermined track N will be described.

In the track jump, as shown in FIG. 1, the microcomputer (not shown) sets the jump changeover switch 4 to the jump signal = 1 and the slip prevention changeover switch 9 to the slip prevention signal = 0.

Therefore, the tracking error signal is
After being processed by the LPF 1, HPF 5, servo adder 2, and servo multiplier 3, the data is input to the LPF 6.

The LPF 6 calculates the average value of the low frequency components in the signal obtained by amplifying the tracking error signal. In the LPF 6, the cutoff frequency is selected to a value that removes noise but does not remove the eccentric frequency of the optical pickup. The output of the LPF 6 is a value excluding noise and the like, and is an average drive voltage of the actuator. Therefore, it can be said that it also indicates the inclination of the objective lens.

Next, the output of the LPF 6 is input to the kick hold circuit 7 to be held when the kick pulse signal is given from the microcomputer. That is, in the track jump, the output of the LPF 6 at the time when the kick pulse signal from the microcomputer is input to the kick hold circuit 7 is held, whereby the kick for the track jump, that is, the acceleration is performed. The value output from the LPF 6 at the moment of starting is held by the hold circuit 13.

Next, the kick pulse signal from the microcomputer is added and applied by the kick adder 8 to the output value held by the kick hold circuit 7.

Since the kicking time is sufficiently shorter than the rotation time of the optical disk and the kicking distance is sufficiently smaller than the working distance of the optical pickup, the output of the kick hold circuit 7 is shown during the kicking. It can be said that it is the inclination of the objective lens. Therefore, the addition of the kick pulse signal by the kick adder 8 means that the kick pulse signal is given based on the current inclination of the objective lens.

That is, since the conventional analog servo does not have a function equivalent to the kick hold circuit 7,
Regardless of the inclination of the objective lens, the shape of the kick pulse signal is the same, which is one of the factors that make tracking control unstable. On the other hand, in the present embodiment, tracking control is performed in consideration of the inclination of the objective lens, that is, the position of the spot 20.

Next, how to apply the kick pulse signal in the track jump will be described with reference to FIGS. 1 and 3. Note that, in FIG. 3, for example, when the spot 20 moves from the track N to the track N + 1,
Shows the state of one track kick.

First, the microcomputer (not shown), as shown in FIG. 3, makes a height KH and a width K when performing a track jump.
The first kick pulse signal of W is applied to the kick adder 8 shown in FIG. The first kick pulse signal composed of the height KH and the width KW is an eigenvalue adapted to the actuator sensitivity.

Therefore, as the tracking drive output, the above-mentioned first kick pulse signal is added to the holding value of the LPF 6 held in the kick hold circuit 7. That is, at the time of track jump, the tracking drive output based on the output of the kick hold circuit 7 is given.

The objective lens is accelerated all at once by the tracking drive output in which the holding value of the kick hold circuit 7 is added to the first kick pulse signal. As will be described later, in the present embodiment, the value of TEmax / 2 is detected by the next second kick pulse signal, but this first kick pulse signal is output. In the period, that is, the width KW, this period is a blind period in order to prevent erroneous detection of the value of TEmax / 2. That is, during this period, the tracking error signal is masked so as not to be input, so that the TEmax value detection process is not performed.

Then, as the second kick pulse signal, the height K which is half the height of the first kick pulse signal is applied.
A kick (acceleration) pulse consisting of H / 2 is given. The reason why the second kick pulse signal is smaller than the height KH in the first kick pulse signal is to reduce the acceleration and reduce the gap between the second kick pulse signal and the deceleration due to the next brake. That is, when the gap between acceleration and deceleration is large, a large positive and negative acceleration is applied to the objective lens, and as a result, the moving distance is a quadratic integral of the acceleration, so that a distance error is likely to occur and unstable. This is a factor.

As shown in FIG. 3, the second kick pulse signal ends when the tracking error signal reaches half of the maximum value TEmax, that is, TEmax / 2. In the figure, for example, from track N to track N
Since the state when jumping to +1 is shown, the tracking error signal reaches the maximum value TEmax in the middle of the track N and the track N + 1, and the tracking error signal TEma is generated during the movement of the spot 20 to the track N + 1.
x / 2, at which point the second kick pulse signal ends.

Next, the height BH is used as a brake pulse signal.
And a brake (deceleration) pulse of width BW is given. The brake pulse signal is also an eigenvalue adapted to the actuator sensitivity.

This brake pulse signal is related to the first and second kick pulse signals for acceleration, and in order to perform an accurate number of kicks, the position and speed of the objective lens after the track jump is almost the same. It is preferably set to 0. Even if these set values are bad, tracking pull-in, that is, convergence to the track is smoothly performed by the slip prevention described below, but the accuracy of the number of kicks is reduced.

Next, the operation of slip prevention, that is, the pulling of the track will be described. When the braking is finished, the operation shifts to the non-slip as shown by the diagonal lines in FIG. Here, the term “non-slip” is used in the optical disc because the spot 20 is in non-contact with the track, so that there is no friction and the image is slippery. Although FIG. 3 shows the slip prevention after one kick,
The same process can be used to prevent slippage for two or more kicks.

During the antiskid period, the antiskid selector switch 9 shown in FIG. 1 is fixed to the 1 side. Therefore, LPF
The output of 6 or the value indicating the inclination of the objective lens is the multiplier 10
Depending on the G1 or G2. The value of G1 is 2, for example, and the value of G2 is 4, for example. These multipliers 10.1
The output of 1 is selected by the magnification changeover switch 12 which is switched by the signal GUP designated by the microcomputer.

The signal TCRS shown in the figure is a signal indicating the position of the spot 20 with respect to the track, and becomes 0 when the spot 20 is near a predetermined position on the track.
That is, as shown in FIG. 2, the signal TCRS becomes 0 when the center of the spot 20 is located at a position within the track N ± 1/4, and the position within the track N ± 1/4 is set to a predetermined on-track position. Within the neighborhood.

As shown in FIG. 4, when the signal TCRS = 0, the inclination of the tracking error signal is in positive phase, while when the signal TCRS = 1, the inclination of the tracking error signal is in opposite phase. That is, when the signal TCRS = 1, the usual tracking servo has the opposite effect.

Therefore, when the signal TCRS = 0,
At the time of pulling in, the servo selector switch 14 is tilted to the 0 side to apply normal tracking servo. And the signal TCRS
At the moment when = 1, the output of the magnification changeover switch 12 is held by the hold circuit 13 and the servo changeover switch 14 at the time of retraction is tilted to the 1 side. As a result, the output of the hold circuit 13 becomes the tracking drive output. Since this tracking drive output is amplified by the multipliers 10 and 11, the braking force is adjusted.

Thus, in the track jump, it is applied as the tracking drive output based on the kick pulse signal or the brake pulse signal.

At this time, in the tracking control method of the optical disk device of the present embodiment, the low frequency component of the tracking drive output immediately before the track jump is held,
A kick pulse signal or a brake pulse signal is added to the hold signal to provide a tracking drive output.

Therefore, in the conventional case, the spot 20
No matter where the position is, when the track jump is performed, the kick pulse signal or the brake pulse signal having the same magnitude is applied as the tracking drive output, which causes the control to be unstable. Then, a kick pulse signal or a brake pulse signal is added based on the position of the spot immediately before the track jump,
Since it is applied as a tracking drive output, it is possible to rapidly and stably move from the track jump to the tracking pull-in and the tracking servo ON state.

Further, in the present control, the above can be achieved by a relatively easy method with almost no increase in processing.

Further, in the tracking control method of the optical disk device of the present embodiment, when the application of the brake pulse signal in the track jump is completed and the process is moved to the track pull-in stage, when the spot 20 deviates from a predetermined vicinity of the on-track, , The tracking drive output is given based on the low frequency component of the tracking drive output immediately before the deviation.

Therefore, since the tracking drive output is given based on the position and speed of the spot, the tracking pull-in and tracking servo ON state can be achieved at high speed and stably.

Further, in the tracking control method for the optical disk device according to the present embodiment, the spot deviates from the predetermined vicinity of the on-track, especially when the application of the brake pulse signal in the track jump is completed and the process moves to the track pull-in stage. It is possible to adjust the retention of the low frequency component in the tracking drive output just before the time of the time lapse to double or quadruple.

As a result, the tracking drive output when the spot deviates from the vicinity of the predetermined on-track can be adjusted in two steps.

Therefore, it is possible to perform the tracking control with high accuracy when shifting to the track pull-in stage.

[Second Embodiment] The following will describe another embodiment of the present invention in reference to FIG. For the sake of convenience, members having the same functions as those shown in the drawings of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the tracking control method for the optical disc apparatus of this embodiment, the low frequency component of the tracking drive output immediately before the track jump is held, and when the tracking servo is performed after the track pull-in,
The tracking servo is started using the holding signal as an initial value.

That is, as shown in FIG. 1, a memory (not shown) is used as a delay means when the calculation processing of the LPF 1 and the HPF 5 is performed.
By not updating the value of 1, the tracking servo can be smoothly started at the time of shifting to the tracking servo.

As a result, in the case of an optical disc with a large amount of eccentricity, the continuity of the tracking servo operation is improved and the shock can be alleviated. At this time, HP
For F5, the processing is always continued.

[0083]

As described above, the tracking control method for the optical disk apparatus according to the first aspect of the present invention holds the low-frequency component of the tracking drive output immediately before the track jump at the time of the track jump, and the kick pulse is included in the holding signal. In this method, a signal or a brake pulse signal is added to produce a tracking drive output.

Therefore, conventionally, no matter where the spot position is, when the track jump is performed, the kick pulse signal or the brake pulse signal having the same magnitude is applied as the tracking drive output, which results in a control failure. Although it was a stability factor, in the present invention, since the kick pulse signal or the brake pulse signal is added based on the position of the spot immediately before the track jump and is applied as the tracking drive output, tracking from the track jump can be stably performed at high speed. The effect that it is possible to shift to the pull-in and tracking servo ON state is provided.

Further, in the control, there is an effect that the processing is hardly increased and the control can be achieved by a relatively easy method.

As described above, in the tracking control method for the optical disk device according to the second aspect of the present invention, when the track is pulled in after the brake pulse signal is applied, the tracking servo is performed within the on-track predetermined vicinity and the on-track predetermined vicinity is achieved. Outside, it is a method of giving a tracking drive output based on the low-frequency component of the tracking drive output when deviating from the vicinity of a predetermined on-track.

Therefore, since the tracking drive output is given based on the position and speed of the spot, tracking pull-in and tracking servo O can be performed at high speed and stably.
It is possible to shift to the N state.

As described above, in the tracking control method for an optical disk apparatus according to the third aspect of the present invention, in addition to the configuration of the second aspect, the tracking drive output given outside the vicinity of the above-mentioned on-track predetermined is on-track predetermined. This is a method that is a signal that holds a value that is twice or four times the low-frequency component in the tracking drive output when it deviates from the vicinity.

Therefore, the tracking drive output when the spot deviates from the vicinity of the predetermined on-track can be adjusted in two steps.

Therefore, in addition to the effect of the second aspect, there is an effect that the tracking control at the time of shifting to the track pull-in stage can be performed with high accuracy.

As described above, in the tracking control method of the optical disk apparatus according to the fourth aspect of the present invention, the low frequency component of the tracking drive output immediately before the track jump is held, and when the tracking servo is performed after the track pull-in. The tracking servo is started by using the holding signal as an initial value.

Therefore, in the case of an optical disc with a large amount of eccentricity, the continuity of the tracking servo operation is improved and the shock can be alleviated. As a result, there is an effect that the tracking servo can be smoothly started at the time of shifting to the tracking servo.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration example of a tracking control circuit of an optical disc device according to the present invention.

FIG. 2 is a schematic view showing an enlarged main part of an optical disc provided in the optical disc device.

FIG. 3 is a time chart showing a control operation at the time of shifting from track jump to track pull-in in the tracking control circuit.

FIG. 4 is a time chart showing a control operation at the time of pulling a track in the tracking control circuit.

[Explanation of symbols]

 4 Jump changeover switch 6 LPF 7 Kick hold circuit 8 Kick adder 9 Anti-slip changeover switch 10 Multiplier 11 Multiplier 13 Hold circuit 14 Servo changeover switch at pull-in 20 Spot

Claims (4)

[Claims] 1. A tracking control method for an optical disk device, wherein tracking servo is performed by a tracking drive output based on a tracking error signal, while track jump or track pull-in is performed by a tracking drive output based on a kick pulse signal or a brake pulse signal. At this time, a tracking control method for an optical disk device, wherein a low-frequency component of a tracking drive output immediately before a track jump is held, and a kick pulse signal or a brake pulse signal is added to the holding signal to provide a tracking drive output. 2. A tracking control method for an optical disk apparatus, wherein tracking servo is performed by a tracking drive output based on a tracking error signal, while track jump or track pull-in is performed by a tracking drive output based on a kick pulse signal or a brake pulse signal. When the track is pulled in after applying a signal, the tracking servo is performed within a predetermined vicinity of the on-track, and a tracking drive output based on the low-frequency component of the tracking drive output when it deviates from the predetermined vicinity of the on-track outside the predetermined vicinity of the on-track. And a tracking control method for an optical disc device. 3. The tracking drive output provided outside the predetermined vicinity of the on-track is the low frequency component of the low-frequency component of the tracking drive output when the deviation from the predetermined vicinity of the on-track is 2.
3. The tracking control method for an optical disk device according to claim 2, wherein the signal is a signal that holds a double or quadruple value. 4. A tracking control method for an optical disk device, wherein tracking servo is performed by a tracking drive output based on a tracking error signal, while track jump or track pull-in is performed by a tracking drive output based on a kick pulse signal or a brake pulse signal. A tracking control method for an optical disk device, characterized in that a low frequency component of a tracking drive output immediately before is held, and when the tracking servo is performed after the track is pulled in, the tracking servo is started using the held signal as an initial value.