JPH08161840A - Tracking controller for optical disk recording and reproducing device - Google Patents

Abstract

PURPOSE: To perform a stable eccentricity correcting operation to an arbitrary track and also to perform a stable track jumping operation by storing tracking error signals of prescribed tracks and sequentially correcting stored data by a minute quantity based on the tracking error signal of the arbitrary track. CONSTITUTION: The output signal from the tracking(TR) signal detecting sensor of an optical pickup 101 is amplified in a TR error signal detecting circuit 102 to be outputted as a TR error signal TE. The TE signal is inputted to a storage circuit 111 via an A/D converter 103 and stors TE data corresponded to rotational positions of respective addresses specified by the rotational position detection signal outputted from a rotational position detecting circuit 110. The TE data are read out of the circuit 111 in accordance with the rotational positions of a disk by the readout command signal from a control circuit 112 to be inputted to a data correcting circuit 119 via a D/A converter 113. The circuit 119 writes TE data in the storage circuit 111 by sequentially correcting the data by the minute quantity while changing the TE data by the minute quantity. A tracking actuator 106 is controlled based on the TE data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking control device for an optical disk recording / reproducing device used in an information recording / reproducing device.

[0002]

2. Description of the Related Art In recent years, an optical information recording / reproducing apparatus for recording an information signal on a disk or reproducing an information signal recorded on a disk by using a laser beam has been put into practical use.

In this information recording / reproducing apparatus, tracking control is used in order to accurately irradiate the track of the disc with the light from the optical pickup.

FIG. 6 is a block diagram showing a schematic structure of a tracking control device of a conventional optical disk recording / reproducing device. In FIG. 6, the signal output from the tracking signal detection sensor incorporated in the optical pickup 601 is
The signal is amplified by the tracking error signal detection circuit 602 and output from the tracking error signal detection circuit 602 as the tracking error signal TE. Tracking error signal TE
Are converted from analog signals to digital data by the A / D converter 603, and the tracking control circuit 60
4 is input. In the tracking control circuit 604, based on the tracking error signal TE, the optical pickup 60
A tracking control signal for driving the tracking actuator 606 is output so that the light beam emitted from 1 traces on the track formed on the optical disc 605. The disk motor 607 is equipped with a rotation detection signal generator 608 for detecting the rotation of the disk motor, and a disk motor FG signal for detecting the rotation speed is output from the rotation detection signal generator 608. Also, the preformatted I on the optical disc 605
By performing signal processing on the D signal in the ID signal processing circuit 609, it is possible to obtain a VMARK signal of one disk one rotation pulse indicating a predetermined absolute rotation position during one rotation of the disk. The rotation position detection circuit 610 receives the disk motor FG signal from the rotation detection signal generator 608 and the VMMARK signal from the ID signal processing circuit 609. Therefore, from the rotation position detection circuit 610,
A rotation position detection signal for the rotation position of the optical disc 605 of the optical pickup 601 is output. The memory circuit 612 is set to the write mode by the write command signal (WR signal) output from the memory control circuit 612.
The tracking error signal converted into digital data by the A / D converter 603 is input to the memory circuit 611,
During one rotation of the optical disc 605, tracking error data corresponding to the rotational position is stored at each address designated by the rotational position detection signal output from the rotational position detection circuit 610. Therefore, the memory circuit 611
The tracking error data for one rotation of the disk is stored in the. After the tracking error data for one rotation of the disk is written in the storage circuit 611, the memory control circuit 61
The memory circuit 611 is set to the read mode by the read command signal (RD signal) output from the device 2, and the tracking error data written in the memory circuit 611 is
The signal is read according to the rotational position of the disk, converted into an analog signal by the D / A converter 613, and then added by the adding circuit 61.
4 is input. Further, the tracking control signal output from the tracking control circuit 604 is the switching circuit 61.
After the tracking servo loop is turned on / off in step 5,
D / A read from the memory circuit 611 by the adder circuit 614
The converted tracking error signal is added and the added signal is input to the drive circuit 616, and the drive voltage output from the drive circuit 616 is applied to the tracking actuator 6
06 is applied.

The tracking error signal stored in the storage circuit 611 is dominated by a deviation of the track from the center of the disk, a so-called eccentricity component.

At this time, the tracking error signal read from the storage circuit 611 and converted into an analog signal by the D / A converter 613 becomes a feedforward signal,
The eccentric component is calculated in advance by the tracking actuator 60.
When the tracking control is performed in this state, the tracking error signal becomes almost zero, that is, the head can trace the track without error, and when the tracking control is turned from ON to OFF, It is possible to stably pull in tracking when access is completed.

[0007]

Originally, the distortion of the track on the disk was dominated by factors such as mechanical displacement when the disk was mounted in the apparatus and center deviation of the disk itself. Discs having a disc have been used, and some discs have different distortions on the inner and outer peripheries. FIG. 7 shows the change in the tracking error signal due to the difference in the scanning position of the head. FIG. 7A shows a tracking error signal in one rotation of the disk when the head is scanning the inner peripheral portion of the disk. Similarly, FIG. 7B shows a tracking error signal in one rotation of the disk when the head is scanning the inner peripheral portion of the disk. Similarly, FIG. 7C shows a tracking error signal in one rotation of the disk when the head is scanning the outer peripheral portion of the disk. As described above, even with the same disk, the distortion of the track differs depending on the head scanning position on the disk radius, so that the waveform of the tracking error signal changes. When such a disk is used, for example, a tracking error signal when the head is located on the inner peripheral portion is stored in the storage circuit 611, and the signal stored in the storage circuit 611 indicates that the head is the disk. When trying to correct the eccentricity at the position from the inner circumference to the outer circumference of the, not only the desired correction effect cannot be obtained, but in some cases, the tracking error may increase further. There is a point.

Further, the gain of the A / D converter 603 and the D / A
Since the gain of the converter 613 varies in each circuit, the tracking error signal and the tracking error signal are
The tracking error signal is actually different from the signal which is stored in the memory circuit 611 through the / D converter 603 and is further output from the memory circuit 611 and converted into the analog signal by the D / A converter 613, because the gain is different. Does not become zero, and there is a problem that the tracking error may increase when the gain variation is large.

The present invention solves the above-mentioned conventional problems, and stores a tracking error signal in a predetermined track on a radius in a memory circuit, and also stores it in the memory circuit based on the tracking error signal in an arbitrary track. The eccentricity correction operation can be performed stably on an arbitrary track by sequentially correcting the existing data by a small amount, and the eccentricity correction operation is also performed stably in a mode in which a track jump signal is output such as the still mode. It is an object of the present invention to provide a tracking control device for an optical disk recording / reproducing device capable of performing the above.

[0010]

In order to achieve this object, a tracking control device of an optical disk recording / reproducing apparatus of the present invention comprises an optical pickup for irradiating the disk with light and receiving reflected light from the disk, and an optical pickup. The detection means for detecting the tracking error signal corresponding to the tracking deviation from the detection signal received by the disc, and the tracking error signal corresponding to the disc rotation position
Sampling means for sampling at a plurality of points during rotation, storage means for storing tracking error data output from the sampling means, and an average value of tracking error signals in one or more rotations of the disk is calculated to obtain average value data. Average value calculation means for outputting, comparison means for comparing the average value data output from the average value calculation means with tracking data, and correction means for correcting the stored value of the storage means based on the comparison result output from the comparison means. An adding means for adding the tracking error signal and the output signal of the storage means, a driving means for driving the tracking displacement means of the optical pickup by the output signal of the adding means, and a tracking displacement means for irradiating the optical pickup. To move the scanning position of the light spot by a specified number of tracks in a specified direction in the radial direction of the disk A track jump mode output means for outputting a track jump command signal and a track jump command signal output from the track jump mode output means are inputted to generate track jump pulses corresponding to the jump direction and the jump track number of the optical pickup of the disc. The correction means has a jumping pulse generating means for outputting at a predetermined rotational position and a track jump position detecting means for outputting a track jump generating position detection signal in the vicinity of a timing at which the jumping pulse generating means outputs a track jump pulse. Data correction ON / OFF switching means is provided, and data correction O
A track jump command signal output from the track jump mode output means and a track jump occurrence position detection signal output from the track jump position detection means are input to the N / OFF switching means.

[0011]

According to the present invention, the tracking error data stored in the storage means is the average value of the tracking error signals even if the track distortion varies depending on which position on the disk radius the head scans. By changing the tracking error signal by a small amount based on the deviation direction from, it is possible to make the change of the tracking error signal zero, that is, the tracking error becomes zero, and the tracking error signal stored in the storage means is scanned by the head. A stable eccentricity correction operation is performed regardless of whether the position is scanning the inner circumference, the middle circumference, or the outer circumference of the disk.

Further, if there is no data correction ON / OFF switching means and the data stored in the storage means is corrected based on the tracking error signal at any rotation position of one rotation of the disk in the track jump mode, the track jump pulse waveform is obtained. Immediately after the track error signal is erroneously corrected by the tracking error signal on which is overlapped, the track jump becomes unstable, or the track jump mode is switched to the normal playback mode (mode in which no track jump pulse is output). In this case, the optical pickup goes out of the on-track position, which causes problems such as instability of the reproduced signal.However, due to the above-mentioned configuration, the value stored in the storage means is stored at a timing near the track jump in the track jump mode. Data correction so as not to correct O The ON / OFF switching means operates and the above-mentioned problem can be solved without erroneously correcting the storage data of the storage means based on the tracking error signal on which the track jump pulse is superimposed, and tracking is performed at a position other than the track jump output position. Since the stored data is corrected based on the error signal, stable eccentricity correction operation is realized even in the track jump mode.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a schematic block diagram of a tracking controller of an optical disk recording / reproducing apparatus according to a first embodiment of the present invention.

In FIG. 1, the signal output from the tracking signal detection sensor incorporated in the optical pickup 101 is amplified by the tracking error signal detection circuit 102 and output from the tracking error signal detection circuit 102 as a tracking error signal TE. The tracking error signal TE is converted from an analog signal into digital data by the A / D converter 103, and is input to the tracking control circuit 104. The tracking control circuit 104 outputs a tracking control signal for driving the tracking actuator 106 based on the tracking error signal TE so that the light beam emitted from the optical pickup 101 traces the track formed on the optical disc 105. To do. The disk motor 107 includes a rotation detection signal generator 1 for detecting the rotation of the disk motor.
08, and a disc motor FG signal for detecting the rotation speed of the disc motor 107 is output from the rotation detection signal generator 108. Also, the optical disc 10
By performing signal processing on the ID signal pre-formatted in No. 5 in the ID signal processing circuit 109, it is possible to obtain a VMARK signal of one rotation of one pulse of the disk indicating a predetermined absolute rotation position during one rotation of the disk. The rotation position detection circuit 110 receives the disk motor FG signal from the rotation detection signal generator 108 and the VMMARK signal from the ID signal processing circuit 109. Therefore, the rotation position detection circuit 110 outputs the optical pickup 101.
A rotational position detection signal for the rotational position of the optical disc 105 is output. The rotational position detection circuit 110 can be usually realized by a counter circuit, and the above-mentioned VM is connected to the reset input terminal.
The ARK signal is input, the disc motor FG signal is input to the clock input terminal, and the count value of the counter circuit is the optical disc 1 from the VMARK signal output position.
The rotation position of 05 is shown.

The memory circuit 111 is set to the write mode by the write command signal (WR signal) output from the memory control circuit 112. The tracking error signal converted into digital data by the A / D converter 103 is input to the storage circuit 111 and designated by the rotational position detection signal output from the rotational position detection circuit 110 during the period in which the optical disc 105 makes one rotation. The tracking error data corresponding to the rotation position is stored at each address, and thus the storage circuit 111 stores the tracking error data for one rotation of the disk. After the tracking error data for one rotation of the disk is written in the memory circuit 111, the memory circuit 111 is set to the read mode by the read command signal (RD signal) output from the memory control circuit 112, and the memory circuit 111 is set to the read mode. The written tracking error data is read corresponding to the rotational position of the disk, converted into an analog signal by the D / A converter 113, and then input to the addition circuit 114. The tracking control signal output from the tracking control circuit 104 is turned on / off by the switch circuit 115 to turn on / off the tracking servo loop, and then the storage circuit 11 is turned on by the adder circuit 114.
1 is added to the D / A converted tracking error signal read from 1, and the added signal is input to the drive circuit 116, and the drive voltage output from the drive circuit 116 is applied to the tracking actuator 106.

The tracking error data converted into digital data by the A / D converter 103 is the average value calculation circuit 11
7 is input. In the average value calculation circuit 117, the disk 1
Calculate the average value of the tracking error data during the rotation period,
The calculation result AVE is output to the comparison circuit 118. The comparison circuit 118 compares the calculation result AVE output from the average value calculation circuit 117 with the tracking error data output from the A / D converter 103, and three levels of high, low, and middle according to the comparison result. Output a logic signal. The ternary logic signal output from the comparison circuit 118 is input to the data correction circuit 119. Here, the rotational position detection signal, which is the output signal of the rotational position detection circuit 110 that detects the rotational position of the head based on the disk motor FG signal and the VMMARK signal, includes an average value calculation circuit 117, a comparison circuit 118, and a data correction circuit. It goes without saying that 119 is input to the memory circuit 111 and these circuits perform processing in synchronization.

The data correction circuit 119 stores tracking error data corresponding to the rotational position of the disk in the storage circuit 11.
When the data correction ON / OFF circuit 120 is set to the data correction operation, the tracking error data is changed by a minute amount according to the logic level of the ternary logic signal of the comparison circuit 118. If the data correction ON / OFF circuit 120 is not set to the data correction operation, on the other hand, the stored data is written in the corresponding address of the memory circuit 111 again, regardless of the logic level of the ternary logic signal output from the comparison circuit 118. Therefore, the tracking error data of the memory circuit 111 does not change.

Here, the data correction ON / OFF circuit 12
The operation setting of 0 will be described. A mode command signal is input to the track jump mode output circuit 121, and the track jump mode output circuit 121 determines a mode in which a track jump is performed based on the mode command signal, and a high level is set in a track jump mode such as a still mode. In addition to outputting the track jump mode signal, the low level track jump mode signal is output in the mode such as the normal reproduction mode in which the track jump is not performed.

The track jump mode output circuit 1
The reference numeral 21 outputs, to the jumping pulse generation circuit 122, data on the jump direction and the jump track number such that the spot of the optical pickup 101 moves by a predetermined number of tracks in a predetermined radial direction of the disk based on the mode command signal.

In the jumping pulse generation circuit 122,
A jump pulse signal for performing a track jump corresponding to the jump direction and the jump track number data is generated at a predetermined rotation position of the optical disc 105 using the VMMARK signal as a reference timing pulse. In the switch circuit 123, the track jump mode output circuit 121
When the output signal of is high level, that is, in the track jump mode, the switch circuit is closed. Therefore, in the track jump mode, the jump pulse signal output from the jumping pulse generation circuit 122 is mixed with the tracking actuator drive signal by the adder circuit 114 via the switch circuit 123, so that the optical pickup 101 performs tracking so as to perform a track jump. The actuator 106 is displaced.

The output signal of the track jump mode output circuit 121 is input to the switch circuit 123 and the data correction ON / OFF circuit 120.

The jump position detection circuit 124 receives the rotation position detection signal output from the rotation position detection circuit 110, and outputs the value of the data of the rotation position detection signal from the jumping pulse generation circuit 122. Is compared with a predetermined value, and when they match, a high-level jump position detection signal is output.

Based on the output signal of the track jump mode output circuit 121 and the jump position detection signal, the data correction ON / OFF circuit 120 is in the memory circuit 111 at the timing when the jump position detection signal becomes high level in the track jump mode. Even when the jump position detection signal is at the low level without rewriting the data of the above data, the data slightly corrected by the data correction circuit 119 is again stored in the storage circuit 111 at the timing when the jump position detection signal is at the low level.
Works like writing to. In modes other than the track jump mode, the data corrected by the data correction circuit 119 is written into the storage circuit 111 again regardless of the rotational position.

FIG. 2 shows the memory circuit 11 during normal reproduction.
3 is a waveform diagram for explaining how the tracking error data stored in No. 1 changes. In this case, as described above, the data correction ON / OFF circuit is the storage circuit 11
It is set so that the stored data of No. 1 is corrected by a small amount and is written again. Therefore, during one rotation of the disk, the tracking error data stored in the storage circuit 111 changes by a small amount and the eccentricity component is changed. Gradually decreases.

FIG. 2A shows the memory circuit 1 at time T1.
11 shows the tracking error data stored in 11.
1 to n indicate the rotational position of the disk, and tracking error data corresponding to the rotational position of the disk are stored at addresses 1 to n of the storage circuit 111. FIG. 2B shows tracking error data which is the output of the A / D converter 103 during one rotation period of the disk from time T1 to time T2.

In FIG. 7C, the memory circuit 111 is shown at time T1.
The tracking error data stored in the storage circuit 111 at time T2 after the data value is slightly changed during the one rotation period of the disk with respect to the tracking error data stored in FIG. FIG. 6D shows the A / D converter 103 in the one rotation period of the disk from time T2 to time T3.
Shows the tracking error data which is the output of the.

In the same figure (e), the memory circuit 111 is shown at time T2.
The tracking error data stored in the storage circuit 111 at time T3 after the data value is slightly changed during the one rotation period of the disk with respect to the tracking error data stored in FIG. FIG. 6F shows the A / D converter 103 in the one rotation period of the disk from time T3 to T4.
Shows the tracking error data which is the output of the.

In FIG. 2A, the storage circuit 111 has already stored the tracking error data output from the A / D converter 103. The addresses of the memory circuit 111 are 1 to n, and n corresponds to the number of FG pulses in one rotation of the disk motor. The tracking error signal read from the storage circuit 111 and converted into an analog signal by the D / A converter 113 operates as an eccentricity correction signal,
The waveform is shown by the solid line in (a). The eccentricity correction signal is added to the tracking error signal by the adder circuit 114, and the tracking error signal obtained by driving the tracking actuator 106 is shown in FIG. 2B, and is converted into digital data by the A / D converter 103. To be done. Figure 2
1-n shown in FIG. 2B corresponds to 1-n in FIG. The average value calculation circuit 117 calculates an average value for one rotation of the disk motor for the value converted into digital data by the A / D converter 103, and outputs average value data AVE1. The average value data AVE1 is calculated during one revolution of the disk motor immediately before, and the average value data is newly calculated during one revolution of FIG. 2B.

In the comparison circuit 118, the average value calculation circuit 117
The average value data AVE1 output from the tracking error data TD (i) is compared in size, and the following comparison result output processing is performed (where i is an integer of 1 to n and corresponds to the rotational position of the disk). Yes.).

If TD (i)> AVE1, the comparison result output is high level. If TD (i) = AVE1, the comparison result output is middle level. If TD (i) <AVE1, the comparison result output is low level. TE to A / D converter 103
The data converted into digital data by the above is referred to as tracking error data, and the tracking error data stored in the storage circuit 111 is referred to as eccentricity correction data, and the distinction between the two is clarified.

In the data correction circuit 119, the comparison circuit 11
The eccentricity correction data MD (i) stored in the memory circuit 111 is slightly changed based on the logical level of the output of 8 and stored in the memory circuit 111 as new eccentricity correction data MDD (i). Here, the processing for changing the eccentricity correction data is performed by the following processing.

If the comparison result output is at high level, MDD
(I) = MD (i) + Δk If the comparison result output is the middle level, MDD (i) = MD
(I) If the comparison result output is low level, MDD (i) = MD
(I) -Δk The tracking error signal shown in FIG. 2B is input, the eccentricity correction data stored in the storage circuit 111 is changed by a small amount, and then read from the storage circuit 111, and D / A converted. The eccentricity correction signal converted into the analog signal by the device 113 is the signal shown by the solid line in FIG. Here, FIG.
The eccentricity correction signal output in (a) is shown by the broken line. By slightly modifying the eccentricity correction data, the eccentricity correction signal shown in FIG. 2C becomes a more faithful reproduction of the track distortion component. As a result, the tracking error signal is shown in FIG. 2D. Thus, the residual error is reduced. In this way, by correcting the eccentricity correction data stored in the storage circuit 111 based on the tracking error signal, the eccentricity correction signal becomes as shown in FIG. 2E, and the tracking error signal is shown in FIG. ), The residual component becomes almost zero.

FIG. 3 shows the memory circuit 1 in the still mode.
11 is a waveform diagram for explaining how the tracking error data stored in 11 changes. In this case, as described above, the data correction ON / OFF circuit 120 operates so as not to correct the storage data of the storage circuit 111 near the track jump pulse generation timing. That is, as shown in FIG. 3B, in the jump position detection circuit 124, the high level is set at the timing TA1 in the vicinity where the jump pulse is output based on the rotation position detection signal output from the rotation position detection circuit 110. Output a jump position detection signal.

FIG. 3A shows the memory circuit 1 at time T1.
11 shows the tracking error data stored in 11.
Reference numerals 1 to n indicate the rotation position of the disk. A jumping pulse is output from the jumping pulse generation circuit 122 near the rotation position 1, and the jumping pulse is mixed with the tracking error signal by the addition circuit 114 via the switch circuit 123.

FIG. 3C shows the tracking error data which is the output of the A / D converter 103 in the one rotation period of the disk from time T1 to T2. FIG. 7D shows time T1.
The tracking error data stored in the memory circuit 111 is shown at time T2 after the data value is slightly changed with respect to the tracking error data stored in the memory circuit 111 during one rotation period of the disk. Here, in the period TA1 near the jumping pulse output timing, the tracking error data stored in the storage circuit 111 is processed at the time T1 at the rotational positions n, 1, 2, 3 by the processing of the data correction ON / OFF circuit. It operates so that it does not change from the value (indicated by a black circle in the figure).

Contrary to the embodiment of the present invention, in the mode such as the still mode in which the jumping pulse is mixed with the tracking error signal to drive the tracking actuator, as in the normal reproduction mode, any one of the disk rotation periods is detected. Even at the position, if the tracking error data stored in the storage circuit 111 is changed by a small amount, the jumping pulse waveform shown in FIG. 3C is determined as a tracking error, and a correction signal for canceling the jumping pulse is output. Therefore, the still jump operation becomes unstable and the stable still jump operation cannot be realized. However, according to the embodiment of the present invention, the tracking error data stored in the storage means is close to the jumping pulse generation timing. Eccentricity component at other positions without changing To small amount correcting the eccentricity correction data so as to reduce the eccentricity component correction effect jumping pulse as the still mode is also stable in mode generated is obtained.

As described above, according to the first embodiment of the present invention, even if the track distortion differs depending on which position on the radius of the disk the head scans, it is stored in the storage means. By changing the tracking error data by a small amount based on the deviation direction from the average value of the tracking error signal, the change of the tracking error signal can be zero, that is, the tracking error can be zero. A tracking control device for an optical disc recording / reproducing apparatus that performs a stable eccentricity correction operation regardless of whether the scanning position of the head is scanning the inner circumference, middle circumference, or outer circumference of the tracking error signal to be stored in Can be provided.

Further, even in the mode such as the still mode in which the jumping pulse signal is superimposed on the tracking error signal to perform the track jump, the eccentricity correction data stored in the storage means at the rotational position near the jumping pulse generation timing. Therefore, a stable track jump operation can also be realized without modifying.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 shows a schematic block diagram of a tracking control device of an optical disc recording / reproducing apparatus according to a second embodiment of the present invention.

In FIG. 4, constituent elements that perform the same operations as those of the first embodiment of the present invention shown in FIG. 1 are designated by the same reference numerals, and detailed description of the operation will be omitted.

In FIG. 4, the drive data generation circuit 401
Then, the drive data in the vicinity of the track jump is calculated based on the storage data stored at the predetermined address of the storage circuit 111. The drive data output from the drive data generation circuit 401 passes through the switch circuit 402 and D
After being converted into an analog signal by the / A converter 113,
It is superimposed on the jumping pulse by the adder circuit 114 and input to the drive circuit 116.

Here, the jump position detection signal output from the jump position detection circuit 124 is input to the switch circuit 402.

That is, when the track jump mode output circuit 121 detects a track jump mode in which a jumping pulse waveform including still mode is output and the track jump mode signal output is at a high level, the VMMARK signal is output. Is used as a timing reference, and the data correction ON / OFF circuit 120 is set so as not to rewrite the stored data of the storage circuit 111 in the vicinity of the rotational position where the jumping pulse is output from the jumping pulse generation circuit 122. The output of the drive data generation circuit 401 operates so as to be input to the D / A converter 113. On the contrary, even in the track jump mode in which the track jump mode signal is at the high level, if the track jump pulse is not near the rotational position output from the jumping pulse generation circuit 122, the data correction ON / OFF circuit 120 corrects the data. The storage data of the storage circuit 111 is set so as to be rewritten corresponding to the output of the circuit 119, and the storage circuit 111 is set in the switch circuit 402.
The output of is input to the D / A converter 113. Also, when the track jump mode signal is at a low level as in the normal reproduction mode, the data correction is turned on.
The / OFF circuit 120 operates so that the data slightly corrected by the data correction circuit 119 is written again in the memory circuit 111, and in the switch circuit 402, the output of the memory circuit 111 is input to the D / A converter 113. Works like.

FIG. 5 shows the memory circuit 11 in the still mode.
The eccentricity correction data output from the drive circuit 1 and the drive data output from the drive data generation circuit 401
The signal waveform diagram for demonstrating operation | movement of the 2nd Example of this invention switched by 02 and input into D / A converter 113 is shown.

As shown in FIG. 5B, in the jump position detection circuit 124, the track jump mode output circuit 12
A switch switching signal which becomes a high level at a timing TA1 near the time when a high level track jump command signal is input from 1 and a jumping pulse is output based on the rotational position detection signal output from the rotational position detection circuit 110. Output.

FIG. 5A shows tracking error data input to the D / A converter 113 at time T1. Here, at the timing TA1, the output data KO (n) to KO (3) of the drive data generation circuit 401 are input to the D / A converter 113 via the switch circuit 402, and at the other timings, the output of the storage circuit 111 is output. The data is input to the D / A converter 113 via the switch circuit 402.

Here, the output data KO (n) to KO
(3) is obtained by performing a linear function complementation operation based on the tracking error data KO (n-1) and KO (4) stored in the storage circuit 111.

FIG. 5C shows the tracking error data which is the output of the A / D converter 103 during the period of one rotation of the disk from time T1 to T2. FIG. 7D shows time T1.
After a slight change in the data value with respect to the tracking error data stored in the storage circuit 111 during one rotation of the disk, the tracking error data and the drive data generated in the storage circuit 111 are generated at time T2. The output data of the circuit 401 (black circle data in the figure) is shown.
Here, the drive data KO (n) to KO (3) output from the drive data generation circuit 401 are slightly changed and stored in the storage circuit 111 as eccentricity correction data KO (n-1) and K.
It is obtained by newly performing a linear function complementation operation based on O (4).

When the second embodiment of the present invention is not used, the eccentricity correction data stored in the memory circuit 111 is stored in the A / D converter 103 during the period TA1 in which the jumping pulse is output in the track jump mode. Since it does not change a small amount based on the output, for example, when a still mode is stopped for a long time, a disturbance is input, or the eccentricity component of the track changes as the head scanning position changes at double speed reproduction. When changing, the eccentricity correction data stored in the storage circuit 111 is sequentially updated based on the tracking error data at rotational positions other than the period TA1, whereas the storage circuit at the rotational position during the period TA1. The eccentricity correction data stored in 111 remains unchanged, and the eccentricity correction data in the storage circuit 111 during this period remains unchanged. When it is used as a racking actuator drive signal, it becomes a drive signal such as the tracking actuator drive signal shown in FIG. Although there is a problem, according to the second embodiment of the present invention, since the drive data of the period TA1 is obtained by complementing the eccentricity correction data before and after the period TA1, a drive signal that almost follows the track is obtained and therefore stable. The track jump operation can be realized.

As described above, according to the second embodiment of the present invention, even if the track distortion is different depending on which position on the radius of the disk the head scans, it is stored in the storage means. By changing the tracking error data by a small amount based on the deviation direction from the average value of the tracking error signal, the change of the tracking error signal can be zero, that is, the tracking error can be zero. A tracking control device for an optical disc recording / reproducing apparatus that performs a stable eccentricity correction operation regardless of whether the scanning position of the head is scanning the inner circumference, middle circumference, or outer circumference of the tracking error signal to be stored in Can be provided.

Further, even in the mode such as the still mode in which the jumping pulse signal is superimposed on the tracking error signal to perform the track jump, the eccentricity correction data before and after the jumping pulse generation timing is obtained at the rotational position near the jumping pulse generation timing. A stable track jump operation can be realized by complementarily calculating and outputting the driving data of the jumping pulse generation timing.

[0053]

As described above, according to the present invention, the tracking error data stored in the storage means is converted into the tracking error signal even if the track distortion is different depending on which position on the radius of the disk the head scans. By changing the tracking error signal by a small amount based on the direction of deviation from the average value, the tracking error signal can be changed to zero, that is, the tracking error can be zero, and the tracking error signal to be stored in the storage means can be stored in the head. It is possible to provide a tracking control device for an optical disc recording / reproducing apparatus, which performs a stable eccentricity correction operation regardless of whether the scanning position is scanning the inner circumference, the middle circumference, or the outer circumference of the disk.

In a mode such as the still mode or the variable speed reproduction in which the jumping pulse signal is superimposed on the tracking error signal to perform the track jump,
At the rotational position near the jumping pulse generation timing, the eccentricity correction data stored in the storage means is corrected as it is so as to accurately correct the eccentricity component in the normal reproduction mode, and is thus stored as it is. Operation can be obtained and stable eccentricity correction operation can be realized, and its practical effect is great.

Further, in the mode such as the still mode in which the jumping pulse signal is superimposed on the tracking error signal to perform the track jump, the eccentricity correction data before and after the jumping pulse generation timing is also stored at the rotational position near the jumping pulse generation timing. By performing a complementary calculation of the driving data of the jumping pulse generation timing and outputting it, the stable track jump operation is realized even if the eccentric waveform pattern changes due to the head scanning position moving in the radial direction of the disk. In addition to being able to achieve this, stable eccentricity correction operation can be realized, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a tracking control device of an optical disc recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram for explaining a correction operation of tracking error data in the first embodiment of the present invention.

FIG. 3 is a waveform diagram for explaining a tracking error data correcting operation in the still mode in the first embodiment of the present invention.

FIG. 4 is a block diagram showing a schematic configuration of a tracking control device of an optical disk recording / reproducing device according to a second embodiment of the present invention.

FIG. 5 is a waveform diagram for explaining a tracking actuator drive data output operation in the still mode in the second embodiment of the present invention.

FIG. 6 is a block diagram showing a schematic configuration of a tracking control device of a conventional optical disc recording / reproducing device.

FIG. 7 is a waveform diagram showing track distortion for explaining the problems of the conventional example.

[Explanation of symbols]

 102 tracking error signal detection circuit 103 A / D converter 106 tracking actuator 108 rotation detection signal generator 109 ID signal processing circuit 110 rotation position detection circuit 111 storage circuit 113 D / A converter 117 average value calculation circuit 118 comparison circuit 119 data Correction circuit 120 Data correction ON / OFF circuit 121 Track jump mode output circuit 122 Jumping pulse generation circuit 124 Jump position detection circuit 401 Drive data generation circuit 402 Switch circuit

Claims (2)

[Claims] 1. An optical pickup for irradiating a disc with light and receiving reflected light from the disc, and a detection means for detecting a tracking error signal corresponding to a tracking deviation from a detection signal received by the optical pickup, Sampling means for sampling the tracking error signal at a plurality of points during one rotation of the disk corresponding to the rotational position of the disk, storage means for storing tracking error data output from the sampling means, and disk 1
Average value calculating means for calculating an average value of the tracking error signal and outputting average value data in a rotation of more than a rotation; and comparing means for comparing the average value data output from the average value calculating means with the tracking error data. Correction means for correcting the stored value of the storage means based on the comparison result output from the comparison means, addition means for adding the tracking error signal and the output signal of the storage means, and the output signal of the addition means for Driving means for driving the tracking displacement means of the optical pickup, and a track jump command for driving the tracking displacement means to move the scanning position of the light spot emitted from the optical pickup by a predetermined number of tracks in a predetermined direction in the radial direction of the disk. Track jump mode output means for outputting a signal and the track jump mode Jumping pulse generation means for inputting a track jump command signal output from the force means and outputting a track jump pulse corresponding to the jump direction and the number of jump tracks of the optical pickup at a predetermined rotational position of the disk, and the jumping pulse. The correction means has a track jump position detection means for outputting a track jump generation position detection signal in the vicinity of the timing at which the generation means outputs a track jump pulse, and the correction means has a data correction ON / OFF switching means. A track jump command signal output from the track jump mode output means and a track jump occurrence position detection signal output from the track jump position detection means are input to the / OFF switching means, and the data correction ON / OFF is performed. Conversion means tracking control device of an optical disk recording and reproducing apparatus at the timing of the track jump near a track jump mode, characterized in that to operate so as not to correct the stored values of said storage means. 2. A drive data generating means for calculating drive data in the vicinity of the track jump based on a storage value of a predetermined address of the storage means, and a track jump mode command is output from the track jump mode output means. The optical disk recording / reproducing according to claim 1, wherein at a timing near the track jump, the output of the drive data generating means is added by the adding means instead of the stored value of the storage means to drive the tracking shift means of the optical pickup. Device tracking control device.