JPH1027366A - Method and device for driving optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for driving an optical disk having servo control for reducing power consumption, maintaining the stability of a servo system and improving a follow-up characteristic. SOLUTION: An optical disk driving device includes a spindle motor 2, a rotational position detecting means for producing a timing signal according to the rotational position of the spindle motor 2 and an error signal compensator 6 for sampling error signals, based on timing signals and simultaneously adding correction signals to a stage before the error signals, and the error signal compensator 6 includes a memory for storing data, base on the sampled error signals, and correction signals are produced and outputted, based on a plurality of data stored before or after one rotational cycle of the spindle motor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo control method for an optical pickup in an optical disk device and an optical disk drive using the servo control method.

[0002]

2. Description of the Related Art As optical discs as rotary recording media, audio CDs, CD-ROMs, write-once optical discs, rewritable magneto-optical disc devices, and the like have already been put into practical use. Active development for performance improvement.

Recently, a CD-ROM drive has been attracting attention as a central player of multimedia as a data reproducing apparatus for a computer. With the increase in application software that handles a large amount of data such as image data, the need for higher speed has increased, and a drive device capable of reproducing information at a rotation speed several times faster than the conventional music reproduction speed has been developed. I have.

[0004] Since the information track pitch of this optical disk is very narrow, a high-precision servo control device is required to accurately reproduce information. Therefore, a servo control device in an optical disk drive that rotates such an optical disk at a high speed is designed so that the so-called servo band is broadened to a high frequency region, thereby securing a loop gain in the rotational frequency region of the disk. Have been.

[0005]

However, in general, broadening the servo band widens the sensitivity of the servo system in response to noise and scratches on the disk which are unrelated to the servo signal, or impairs the stability of the pickup. There has been a problem that heat generation of the actuator and the circuit is caused, and power consumption cannot be reduced due to useless power loss.

In the servo control of the optical disk drive according to the present invention, it is required to reduce power consumption and to improve the following characteristics while maintaining the stability of the servo system.

In view of the above, it is an object of the present invention to provide an optical disk drive method and an optical disk drive device having a servo control in which the power consumption is reduced and the tracking characteristic is improved while maintaining the stability of the servo system. .

[0008]

In order to achieve this object, a servo control according to the present invention is a servo device for following a control target on an information track on a rotating disk based on an error signal. Rotating means for rotating the rotating means, a rotating position detecting means for generating a timing signal according to the rotating position of the rotating means, and sampling the error signal based on the timing signal, and at the same time, a correction signal before the error signal Error signal correction means for adding, the error signal correction means having a memory for storing data based on the sampled error signal, and a plurality of data stored one rotation cycle before or after the rotation means. A process for generating and outputting a correction signal based on the

According to the present invention, it is possible to increase the loop gain in the rotational frequency region of the disk without increasing the servo band, so that it is possible to realize an optical disk drive with good responsiveness, stable operation and low power consumption. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claims 1 and 3 of the present invention provides an optical disk rotating step for rotating an optical disk, a reproducing step for reproducing information recorded on the optical disk, and information from the rotating optical disk. A servo control step of detecting, as an error signal, a deviation of the position of the information reproducing means with respect to the information track for reproducing the information, and causing the information reproducing means to follow the information track. A rotation position detection step of generating a timing signal according to the position, an error signal correction step of sampling an error signal based on the timing signal and simultaneously adding a correction signal to the error signal, and data based on the sampled error signal. Error signal correction Step is a disc driving method and an optical disk drive apparatus characterized by generating and outputting a correction signal based on the data of one rotation cycle before or subsequent data storage step of the optical disc rotating step.

According to the present invention, it is possible to increase the loop gain in the rotational frequency region of the disk with a simple structure.

According to a second and fourth aspects of the present invention, in addition to the first and third aspects of the present invention, the error signal correcting step includes the step of: A first memory step for storing as data,
The respective first data in the first memory step before the first rotation cycle and before the second rotation cycle and the first data sampled this time
A second memory step of selecting or calculating intermediate data of these first data and storing the same as second data, one rotation cycle before or after the rotation step of the optical disk. An optical disc driving method and an optical disc driving apparatus, characterized in that a correction signal is generated based on a plurality of second data stored in the optical disk drive, and a correction signal is added to an error signal.

According to the present invention, the loop gain in the rotational frequency region of the disk can be increased with a simple configuration, and the tracking error signal can be suppressed without malfunction even when disturbance is applied. Things.

According to a third or fourth aspect of the present invention, in addition to the second aspect, a flaw detecting means for detecting dirt or flaws on the optical disk, or external vibration is applied. When the magnitude of the vibration exceeds a predetermined value, there is provided disturbance detecting means for detecting that a disturbance has been applied, and the error signal correcting means comprises a plurality of error signals stored one rotation cycle before or after the rotation means. A correction signal is generated based on the data, and when a flaw is detected by the flaw detection means, the data stored in the data storage memory is stored as a predetermined fixed value, or a disturbance is applied by the disturbance detection means. Detecting that the data is stored in the data storage memory as a predetermined fixed value, and performing a process of generating and outputting a correction signal based on the fixed value. A click drive.

According to the present invention, the servo signal can be prevented from being disturbed by ignoring an error signal when a flaw or a disturbance is received.

According to a fifth or sixth aspect of the present invention, in addition to the first to fourth aspects, a flaw detecting means for detecting dirt or flaws on the optical disk, or vibration from the outside is provided. When the magnitude of the vibration exceeds a predetermined value when applied, the apparatus has a disturbance detecting means for detecting that a disturbance is applied, and the error signal correction means is stored one rotation cycle before or after the rotation means. A correction signal is generated based on the plurality of data, and when a flaw is detected by the flaw detection means, the data to be stored in the data storage memory is stored as a predetermined fixed value, or the disturbance is detected by the disturbance detection means. If the addition is detected, the data to be stored in the data storage memory is stored as a predetermined fixed value,
An optical disc drive device that performs a process of generating and outputting a correction signal based on a fixed value.

According to the present invention, it is possible to prevent a servo from being disturbed by ignoring an error signal when a flaw or a disturbance is received.

According to a seventh aspect of the present invention, there is provided a comparing means for comparing the data stored in the data storage memory at the time of the previous sampling with the error signal sampled this time, If the comparison result of the means exceeds a predetermined value, a new value that makes the comparison result equal to or smaller than the predetermined value is stored in the data storage memory as data to be stored this time, and the data stored in the data storage memory is stored in the data storage memory. An optical disk drive device that performs processing of generating and outputting a correction signal based on the correction signal.

According to the present invention, when the tracking error signal is disturbed due to a scratch on the disk and it cannot be recognized that the tracking error signal is a scratch, the amount of change between the previous sample value and the current sample value is restricted to limit the error. The signal compensator 6 has an effect that the disturbance of the servo control can be suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram of an optical disk drive according to Embodiment 1 of the present invention. In FIG. 1, 1 is an optical pickup, 2 is a spindle motor for rotating a disk, 3 is a phase compensation filter, 4 is an amplifier, 5 is a driver, 6 is an error signal compensator, 7 is a low-pass filter,
8 is an A / D converter, 9 is a controller, 10 is a D / A converter, and 11 is an adder.

Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
Will be described. The tracking error signal output from the optical pickup 1 is amplified by the error signal compensator 6 in the rotational frequency range of the disk. Thereafter, the signal passes through a phase compensation filter 3 for stabilizing the servo loop and an amplifier 4 for securing a required signal level in the entire servo band, and is converted into a drive signal for driving the actuator of the optical pickup 1 in the tracking direction by the driver 5. Is output.

The encoder signal output from the spindle motor 2 is generated, for example, based on the output of a hall element provided in the spindle motor and used for rotation control. During one rotation, four pulse signals are generated from one Hall element at equal intervals. Hereinafter, a case where a pulse signal generated from one Hall element of the 8-pole motor is used as an encoder signal will be described as an example.

The controller 9 of the error signal compensator 6
The signal of the output stage of the error signal compensator 6 is A / D at the timing of the rising and falling edges of the encoder signal.
The data is sampled by the converter 8, that is, sampled eight times during one rotation of the disk, and the data is sequentially stored in a memory inside the controller 9. At the same time, 7
A correction value that is an average value of two (plural) data of data stored before a sample (one rotation before a sample of one rotation) and data stored eight samples before (one rotation cycle before) Calculated and output by the D / A converter 10,
The processing of adding to the tracking error signal and outputting the result by 1 is performed.

FIG. 2 is a flowchart showing processing of the error signal compensator 6 according to the first embodiment of the present invention. In FIG. 2, the process is started when an encoder signal from the spindle motor 2 is input.

First, the signal at the output stage of the error signal compensator 6 is sampled by the A / D converter 8 (step 1).
The sampled data is stored in a memory (step 2).

Next, a correction value, which is an average value of the data stored seven samples before and the data stored eight samples before, is calculated (step 3), and the calculated correction value is sent to the D / A converter 10. , And the result is added to the tracking error signal by the adder 11 (step 4). The above processing is repeated every time an encoder signal is input.

FIG. 3 shows a transfer characteristic diagram of the error signal compensator 6 (ie, a transfer characteristic from the input point to the output point of the tracking error signal in the adder 11) in the first embodiment of the present invention. In FIG. 3, the horizontal axis is the rotation frequency of the motor. As shown in FIG. 3, the error signal compensator 6
For a signal such as a tracking error signal in which the rotational frequency component of the motor constantly appears, the processing of FIG. 2 is repeated to steadily increase the rotational frequency of the motor and the gain of its harmonic component. It has the characteristic to make it.

FIG. 4 shows a waveform diagram of the tracking error signal, the output of the D / A converter 10 and the output of the adder 11 according to the first embodiment of the present invention. As shown in FIG.
During the operation of the tracking servo device, a slight rotation frequency component of the disk appears in the tracking error signal.
In the output of the D / A converter 10, the rotation frequency component is emphasized and the phases are synchronized. Therefore, the output of the adder 11 is output after the amplitude of the rotation frequency component in the tracking error signal is amplified.

As described above, according to the present invention, the loop gain in the rotation frequency region of the disk can be increased with a simple configuration without increasing the servo band, and a servo device with high tracking performance can be realized.

(Embodiment 2) FIG. 5 is a flowchart showing a series of processes of the signal compensator 6 according to Embodiment 2 of the present invention. The tracking servo device according to the second embodiment is the same as that shown in FIG. However, it is assumed that the controller 9 has a buffer memory separately in addition to the main memory for storing data described in the first embodiment.

The processing in FIG. 5 is started when an encoder signal from the spindle motor 2 is input. In FIG. 5, first, the signal at the output stage of the error signal compensator 6 is sampled by the A / D converter 8 (step 11).

Next, an intermediate value between the data sampled this time and the two data stored in the first buffer memory eight samples before is stored in the main memory as the current sampled data (step 12). Then, a correction value, which is an average value of the data stored in the main memory seven samples before and the data stored in the main memory eight samples before, is calculated (step 13).

The calculated correction value is output as an analog signal by the D / A converter 10, and is added to the tracking error signal by the adder 11 (step 14).

Which of the data sampled this time and the two data stored in the main memory 8 samples before (one rotation cycle before) and 16 samples before (two rotation cycles before) is closer to the value of the data sampled this time. The data is stored in the first buffer memory (step 15). The above processing is repeated every time an encoder signal is input.

FIG. 6 is a waveform diagram of the tracking error signal, the output of the D / A converter 10, and the output of the adder 11 according to the second embodiment of the present invention. As shown in FIG.
When a disturbance is given from outside the device during operation of the tracking servo device, the tracking error signal is disturbed. In the error signal compensator 6, the sample value at the time when the tracking error signal is disturbed is considerably different from the sample value before one rotation and the sample value before two rotations, and is not stored as a result of the above-described processing. . Therefore, D / A converter 1
The influence of disturbance does not appear on the output of 0 and the adder 11, and the error signal compensator 6 can output a stable signal.

As described above, according to the present invention, it is possible to increase the loop gain in the rotation frequency region of the disk with a simple configuration without extending the servo band to the region of high frequency components, and even if disturbance is applied from outside the device. It is possible to realize a servo device having a high tracking capability capable of suppressing a tracking error signal without causing a malfunction.

(Embodiment 3) FIG. 7 is a block diagram of an optical disk apparatus according to Embodiment 3 of the present invention. FIG.
1, 1 is an optical pickup, 2 is a spindle motor, 3 is a phase compensation filter, 4 is an amplifier, 5 is a driver, 6 is an error signal compensator, 7 is a low-pass filter, 8
Denotes an A / D converter, 9 denotes a controller, 10 denotes a D / A converter, and 11 denotes an adder. These components are the same as those in the first embodiment, and the description thereof will not be repeated.

Reference numeral 12 denotes a flaw detection circuit, which comprises, for example, a peak hold circuit and a comparator circuit.
The peak hold circuit detects the peak level of the information signal reproduced from the optical pickup 1, and outputs a flaw detection signal when the comparator circuit detects that the peak level has decreased due to flaws or dirt.

The operation of the optical disk drive according to the third embodiment of the present invention will be described below with reference to FIG. The tracking error signal output from the optical pickup 1 is amplified by the error signal compensator 6 in the rotational frequency range of the disk. Thereafter, the signal passes through a phase compensation filter 3 for stabilizing the servo loop and an amplifier 4 for securing a required signal level in the entire servo band, and is converted into a drive signal for driving the actuator of the optical pickup 1 in the tracking direction by the driver 5. Is output.

The encoder signal output from the spindle motor 2 will be described with reference to an example in which a pulse signal generated from one Hall element of an 8-pole motor is used as the encoder signal, as in the first embodiment. . The controller 9 of the error signal compensator 6 determines the timing of the rising and falling edges of the encoder signal,
That is, the signal at the output stage of the error signal compensator 6 is sampled by the A / D converter 8 at a rate of eight times during one rotation of the disk.

At this time, if no flaw detection signal is input from the flaw detection circuit 12, the sampled data is stored in a memory inside the controller 9. When the flaw detection signal is input, the reference level signal data of the servo circuit is stored. At the same time, a correction value, which is an average value of the data stored 7 samples before and the data stored 8 samples before, is calculated and output by the D / A converter 10, and the adder 11 converts the correction value into a tracking error signal. A process of adding and outputting is performed.

FIG. 8 shows a tracking error signal, a flaw detection signal of flaw detection circuit 12 and D
3 shows waveform diagrams of the output of the / A converter 10 and the output of the adder 11. FIG. As shown in FIG. 8, when a scratch is present over a plurality of tracks on the disk, the tracking error signal is disturbed at the same rotational angle position of the motor. By the above-described processing, the disturbed signal data sampled when the flaw detection signal is generated is not stored, but the reference level signal of the servo device is stored instead.
The output signal of the converter 10 outputs a reference level signal at the position of the flaw. Therefore, even if the error signal is disturbed over a plurality of rounds due to the scratch, the error signal compensator 6 can be prevented from disturbing the servo by ignoring the error signal in that portion.

As described above, according to the present invention, a simple configuration reduces the power consumption, improves the tracking characteristics while maintaining the stability of the servo system, and does not malfunction even if there is a scratch on the disk. The device can be realized.

(Embodiment 4) FIG. 9 is a block diagram of an optical disk apparatus according to Embodiment 4 of the present invention. FIG.
1, 1 is an optical pickup, 2 is a spindle motor, 3 is a phase compensation filter, 4 is an amplifier, 5 is a driver, 6 is an error signal compensator, 7 is a low-pass filter, 8
Denotes an A / D converter, 9 denotes a controller, 10 denotes a D / A converter, and 11 denotes an adder. These components are the same as those in the first embodiment, and the description thereof will not be repeated.

Numeral 13 denotes a vibration detecting circuit, which comprises, for example, a band-pass filter circuit, a peak hold circuit, and a comparator circuit, and which has the same frequency as the vibration frequency appearing in the tracking error signal when vibration is applied from outside the apparatus. Is extracted by a band-pass filter circuit, and when the amplitude level becomes larger than a predetermined value, a vibration detection signal is output.

Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
Will be described. The tracking error signal output from the optical pickup 1 is amplified by the error signal compensator 6 in the rotational frequency range of the disk. Thereafter, the signal passes through a phase compensation filter 3 for stabilizing the servo loop and an amplifier 4 for securing a necessary amplification factor in the entire servo band, and is then converted into a drive signal for driving the actuator of the optical pickup 1 in the tracking direction by the driver 5. Converted and output.

The encoder signal output from the spindle motor 2 is generated based on, for example, the output of a Hall element provided in the spindle motor 2 and used for rotation control. With this motor, four pulse signals are generated from one Hall element at equal intervals during one rotation.

Hereinafter, a case where a pulse signal generated from one Hall element of the 8-pole motor is used as an encoder signal will be described as an example. The controller 9 of the error signal compensator 6 performs A / D conversion of the signal at the output stage of the error signal compensator 6 at the timing of the rising and falling edges of the encoder signal, that is, at a rate of eight times during one rotation of the disk. The sample is taken by the container 8.

At this time, if no vibration detection signal is output from the vibration detection circuit 13, the sampled data is stored in the memory inside the controller 9. When the vibration detection signal is output, the reference level signal data of the servo circuit is stored in the internal memory. At the same time, a correction value, which is an average value of the data stored 7 samples before and the data stored 8 samples before, is calculated and output by the D / A converter 10, and the adder 11 converts the correction value into a tracking error signal. A process of adding and outputting is performed.

FIG. 10 is a waveform diagram of the tracking error signal, the vibration detection signal of the vibration detection circuit 13, the output of the D / A converter 10, and the output of the adder 11 according to the fourth embodiment of the present invention. As shown in FIG. 10, when vibration is applied from outside the device, the tracking error signal is disturbed. At this time, since the vibration detection signal is output by the vibration detection circuit 13, the disturbed signal data sampled during the generation of the vibration by the above processing is not stored, but the reference level signal of the servo device is stored instead. Therefore, a reference level signal is output at the position of the flaw.

Therefore, even if the error signal is disturbed over a plurality of rounds due to vibration, disturbing the servo control of the error signal compensator 6 can be prevented by ignoring the error signal in that part. As described above, according to the present invention, it is possible to realize a servo device which has a simple configuration, does not increase the servo band, increases the followability, and does not malfunction even when vibration is applied from outside the device.

(Embodiment 5) FIG. 11 is a flowchart showing the processing contents of the error signal compensator 6 in Embodiment 5 of the present invention. The tracking servo device according to the fifth embodiment of the present invention is the same as that shown in FIG. 1, and the controller 9 includes a first buffer memory and a second buffer memory in addition to the main memory for storing data described in the first embodiment. And a buffer memory.

The processing in FIG.
Is started when an encoder signal is input from the. First, the signal at the output stage of the error signal compensator 6 is A / D
It is sampled by the converter 8 (step 21).

Next, an intermediate value between the data sampled this time and the data stored in the first buffer memory eight samples before is obtained and stored in the main memory as the current sampled data (step 22).

Next, a correction value which is an average value of the data stored in the main memory seven samples before and the data stored in the main memory eight samples before is calculated (step 23). Further, the correction value obtained in step 23 is compared with the correction value one sample before stored in the second buffer memory, and the current correction value is compared with the previous correction value by a predetermined level (denoted by Δ). ), The current correction value is newly calculated as (previous correction value + (−) Δ) (step 24).

The calculated correction value is output by the D / A converter 10 and added to the tracking error signal by the adder 11 (step 25). The data sampled this time,
Further, of the data stored in the main memory 8 samples before and 16 samples before, data close to the data sampled this time is stored in the first buffer memory (step 2).
6). The output correction value is stored in the second buffer memory (step 27). The above processing is repeated every time an encoder signal is input.

By performing such processing, when the tracking error signal is disturbed due to a scratch on the disk and it cannot be recognized that it is a scratch, that is, the tracking error signal remains disturbed even after passing through the scratched portion. In such a case, the amount of change between the previous sample value and the current sample value is limited so that the error signal compensator 6
Can suppress the disturbance of the servo control.

As described above, according to the present invention, it is possible to realize a servo device which has a simple structure, improves the followability without increasing the servo band, and does not malfunction even if there is a scratch on the disk.

[0059]

As described above, according to the present invention, it is possible to increase the loop gain in the rotation frequency region of the optical disk with a simple structure without expanding the servo band to a high frequency region. It is possible to provide an optical disk drive device which has high performance and is resistant to scratches and disturbance of the optical disk.

[Brief description of the drawings]

FIG. 1 is a block diagram of an optical disk drive according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing processing of an error signal compensator according to Embodiment 1 of the present invention.

FIG. 3 is a transfer characteristic diagram of the error signal compensator according to the first embodiment of the present invention.

FIG. 4 is a waveform diagram of a tracking error signal, an output of a D / A converter, and an output of an adder according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a series of processes of the signal compensator according to the second embodiment of the present invention.

FIG. 6 is a waveform diagram of a tracking error signal, an output of a D / A converter, and an output of an adder according to the second embodiment of the present invention.

FIG. 7 is a block diagram of an optical disc device according to a third embodiment of the present invention.

FIG. 8 is a waveform diagram of a tracking error signal, a flaw detection signal of a flaw detection circuit, an output of a D / A converter, and an output of an adder according to the third embodiment of the present invention.

FIG. 9 is a block diagram of an optical disc device according to a fourth embodiment of the present invention.

FIG. 10 is a waveform diagram of a tracking error signal, a vibration detection signal of a vibration detection circuit, an output of a D / A converter, and an output of an adder according to Embodiment 4 of the present invention.

FIG. 11 is a flowchart showing processing contents of an error signal compensator according to a fifth embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical pickup 2 spindle motor 3 phase compensation filter 4 amplifier 5 driver 6 error signal compensator 7 low-pass filter 8 A / D converter 9 controller 10 D / A converter 11 adder 12 flaw detection circuit 13 vibration detection circuit

Claims (7)

[Claims] An optical disk rotation step of rotating an optical disk; a reproduction step of reproducing information recorded on the optical disk; and an error signal indicating a deviation of a position of an information reproducing means for reproducing information from the rotating optical disk with respect to an information track. A servo control step of detecting information as follows and causing the information reproducing means to follow the information track, a rotation position detection step of generating a timing signal according to the rotation position of the optical disk in the rotation step,
An error signal correction step of sampling the error signal based on the timing signal and simultaneously adding a correction signal to the error signal; anda data storage step of storing data based on the sampled error signal. The optical disk driving method, wherein the signal correcting step generates and outputs the correction signal based on a plurality of the data in a data storing step one rotation cycle before or after the optical disk rotation step. 2. The error signal correcting step includes: a first memory step of storing the error signal sampled this time as first data; and a first memory step of one rotation cycle before and two rotation cycles before. The first of
A second memory step of comparing or comparing the first data sampled with the first data sampled this time and selecting or calculating intermediate data of the first data and storing the data as second data, 2. The optical disk according to claim 1, wherein a correction signal is generated based on the plurality of second data stored before or after one rotation cycle of the rotation step, and the correction signal is added to the error signal. Drive method. An optical disk rotating means for rotating the optical disk; an information reproducing means for reproducing information from the rotating optical disk; and a deviation of a position of the information reproducing means with respect to the information track is detected as an error signal to reproduce the information. An optical disc drive having servo control means for causing the means to follow an information track, wherein the optical disc rotation means generates a timing signal in accordance with the rotation position of the optical disc;
An error signal correction unit that samples the error signal based on the timing signal and simultaneously adds a correction signal to the error signal; and a data storage memory that stores data based on the sampled error signal. An optical disk drive device for generating and outputting the correction signal based on a plurality of the data stored before or after one rotation cycle of the rotation unit. 4. The method according to claim 1, wherein the error signal correcting means stores the error signal sampled this time as first data.
Comparing the first data in the first storage unit before the first rotation cycle and the first data sampled this time in the first storage unit before one rotation cycle and comparing the first data with the first data this time. And a second storage unit for selecting or calculating intermediate data of the optical disk and storing the selected data as second data, wherein the plurality of second data stored before or after one rotation cycle of the optical disk rotation unit. 4. The optical disk drive according to claim 3, wherein a correction signal is generated based on the error signal, and the correction signal is added to the error signal. 5. An information reproducing apparatus comprising: an optical disk rotating means for rotating an optical disk; an information reproducing means for reproducing information from the rotating optical disk; An optical disc drive having servo control means for causing the means to follow an information track, wherein the optical disc rotation means generates a timing signal in accordance with the rotation position of the optical disc;
Error signal correction means for sampling the error signal based on the timing signal and simultaneously adding a correction signal to the error signal; flaw detection means for detecting dirt or flaw on the optical disc; and storing data based on the sampled error signal. A data storage memory, wherein the error signal correction means generates a correction signal based on a plurality of data stored before or after one rotation cycle of the rotation means, and the flaw detection means detects a flaw. An optical disk drive device that stores data to be stored in the data storage memory as a predetermined fixed value and generates and outputs a correction signal based on the fixed value. 6. An optical disk rotating means for rotating an optical disk, an information reproducing means for reproducing information from the rotating optical disk, and a deviation of a position of the information reproducing means with respect to the information track is detected as an error signal to reproduce the information. An optical disc drive having servo control means for causing the means to follow an information track, wherein the optical disc rotation means generates a timing signal in accordance with the rotation position of the optical disc;
Error signal correction means for sampling the error signal based on the timing signal and simultaneously adding a correction signal to the error signal; and when external vibration is applied, when the magnitude of the vibration exceeds a predetermined value, disturbance is applied. And a data storage memory for storing data based on the sampled error signal, wherein the error signal correction means includes a plurality of data stored one rotation cycle before or after the rotation means. A correction signal is generated on the basis of the data, and when the disturbance is detected by the disturbance detecting means, the data to be stored in the data storage memory is stored as a predetermined fixed value, and based on the fixed value. An optical disk drive device for performing a process of generating and outputting a correction signal by using the same. 7. An optical disk rotating means for rotating an optical disk, an information reproducing means for reproducing information from the rotating optical disk, and a deviation of a position of the information reproducing means with respect to an information track is detected as an error signal to reproduce the information. An optical disc drive having servo control means for causing the means to follow an information track, wherein the optical disc rotation means generates a timing signal in accordance with the rotation position of the optical disc;
An error signal correction unit that samples the error signal based on the timing signal and simultaneously adds a correction signal to the error signal; a data storage memory that stores data based on the sampled error signal; and a data storage memory that has been sampled last time. And a comparing unit for comparing the data stored in the second unit with the error signal sampled this time, wherein the error signal correcting unit sets the comparison result to a predetermined value when the comparison result of the comparing unit exceeds a predetermined value. The following new value is stored in the data storage memory as data to be stored this time, and a process of generating and outputting a correction signal based on the data stored in the data storage memory is performed. Optical disk drive.