JPH08171728A - Movement controller for optical pickup - Google Patents

Abstract

PURPOSE: To inexpensively obtain a movement controller of an optical pickup of short seek time and high performance. CONSTITUTION: This movement controller has an EEPROM 9 which stores the differences between an assigned seek distance and actually sought distances, i.e., error data, according to the seek distances, a track counter 7 which detects the moving distance of an optical pickup 3 and a controller 8 which determines the seek distance up to an assigned address, reads the error data meeting the determined seek distance out of an error data memory means, corrects the seek distance in accordance with the read out error data, stops the movement of a revolution motor 5 in accordance with the corrected seek distance and the information on the moving distance of a track counter 7, then updates an error data table.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movement control device for an optical pickup which is provided in an optical disc device and which seeks the optical pickup at high speed to a desired track.

[0002]

2. Description of the Related Art In recent years, so-called optical disks such as CD-ROMs and magneto-optical disks, which have a higher recording density and a lower bit unit price than floppy disks, have become widespread, and optical disk devices for recording / reproducing information on / from the optical disks. Then, as a particularly important factor that influences the performance, there is a time required for the optical pickup to seek (move) to a target address, that is, a seek time.

In a magneto-optical disk device for a computer, which requires a seek time equivalent to that of a hard disk, a linear motor is used for seeking the optical pickup, and speed control is generally performed so that the speed of the linear motor follows the command speed. It is being appreciated. As a result, the speed of the optical pickup is precisely controlled, the seek error which is the difference between the designated seek distance and the actually seeked distance is small, and the seek time is short.

However, the linear motor has a drawback that the seek error is small and the performance of the device is improved, but on the other hand, it is expensive, so that the cost of the device is soared. Unfavorable. Therefore, in a CD-ROM device or the like used for consumer use, a low-priced rotary motor is used for seek operation of an optical pickup, and control is also simple such as acceleration / deceleration / stop. However, in this, the speed of the optical pickup is not precisely controlled, so it is not possible to stop at a predetermined track and overrun,
The seek error is large and the seek time is long.

As a conventional example for preventing overrun, Japanese Patent Laid-Open No. 64-76574 discloses a prediction of the stopping distance required to stop when braking is started at that time based on the current moving speed of the optical pickup. However, there is disclosed a configuration for giving a braking command to the drive source of the optical pickup when it matches the remaining distance of the seek.

[0006]

However, according to the configuration of the above publication, it is possible to reduce the overrun, but it is necessary to obtain the moving speed of the optical pickup with high accuracy in order to reduce the seek error. , A circuit or a sensor for determining the moving speed of the optical pickup is required. Further, since a calculation for predicting the stop distance one after another during the seek operation is required, a high speed calculation means is also required. As a result, the structure of the device becomes complicated and the price of the device rises.

The movement control device for an optical pickup according to the present invention has been made in view of the above problems, and a movement control device for a high-performance optical pickup which has a simple device configuration to reduce a seek error and has a short seek time is provided. It is intended to be provided at a low price.

[0008]

In order to solve the above-mentioned problems, a movement control device for an optical pickup according to claim 1 of the present invention relates to an optical disc on which information including address information is recorded in a track form. In an optical pickup movement control device having an optical pickup for irradiating a light beam to read recorded information and an optical pickup moving means for supporting the optical pickup and moving the optical pickup in a direction traversing a track of an optical disc, the optical pickup is instructed. It consists of a seek distance calculating means for obtaining a seek distance for seeking to an address, a moving distance detecting means for detecting a moved distance of the optical pickup, and a difference between a designated seek distance and an actually seek distance of the optical pickup. Error data storage means for storing the error data according to the seek distance,
The error data corresponding to the seek distance obtained by the seek distance calculating means is read from the error data storage means,
Seek distance correcting means for correcting the seek distance based on the read error data to obtain a corrected seek distance, the corrected seek distance obtained by the seek distance correcting means, and the movement of the optical pickup obtained by the moving distance detecting means. Drive control means for controlling the optical pickup moving means based on the distance information.

According to a second aspect of the invention, there is provided a movement control device for an optical pickup according to the first aspect, wherein the error data storage means has a plurality of seek distances according to the number of distances. It is characterized in that it is divided into regions and error data for each region is stored.

According to a third aspect of the invention, there is provided the movement control device for the optical pickup according to the first or second aspect, wherein the error data storage means stores the error data for each seek direction of the optical disk. The feature is that it is also memorized.

According to a fourth aspect of the present invention, there is provided an optical pickup movement control device according to the second aspect, wherein the error data storage means has a difference in error data between adjacent areas. The feature is that the regions are divided so that they are almost equal.

According to a fifth aspect of the present invention, in the movement control device for the optical pickup according to the first, second, third, or fourth aspect, the error data storage means is rewritable. It is characterized in that it comprises a memory and is provided with updating means for updating the error data in the error data storage means for each seek operation.

According to a sixth aspect of the present invention, there is provided the optical pickup movement control device according to the fifth aspect, wherein the updating means has error data in error during seek operations performed a plurality of times in the past. It is characterized by rewriting so that it becomes the average value of.

[0014]

According to the structure of claim 1, when it becomes necessary to perform the seek operation, the seek distance calculating means first moves the optical pickup from the current address where the optical pickup is located to the instructed address. Find the seek distance that should be done. The error data storage means stores error data, which is the difference between the specified seek distance and the distance actually seeked by the optical pickup, according to the seek distance. The difference between the specified seek distance and the actual seek distance of the optical pickup is approximately equivalent to the distance that the optical pickup moves by inertial force after the driving source is stopped. The seek distance correction means reads error data corresponding to the seek distance calculated by the seek distance calculation means from the error data storage means, corrects the seek distance based on the read error data, and obtains a corrected seek distance. on the other hand,
The moving distance of the optical pickup is sequentially detected by the moving distance detecting means, and the drive control means is based on the moving distance information detected by the moving distance detecting means and the corrected seek distance obtained by the seek distance correcting means. Control the optical pickup moving means. That is, for example, when it is confirmed that the optical pickup has advanced the correction seek distance, the drive source of the optical pickup moving means is stopped. As a result, after the drive source is stopped, the optical pickup is moved by inertial force, and the movement causes the optical pickup to be sent to the designated address. Therefore, it is possible to reduce the overrun that is moved beyond the specified address,
The seek error can be reduced to shorten the seek time.

In this case, Japanese Patent Laid-Open No. 64-7657.
Since it is not necessary to obtain the moving speed of the optical pickup with high accuracy as in the configuration of Japanese Patent No. 4, the circuit or sensor for obtaining the moving speed of the optical pickup becomes unnecessary. Moreover, since the corrected seek distance can be obtained at the time when the seek destination address is designated, there is no need to perform a calculation for predicting the sequential stop distance during the seek operation, and a high speed calculation means or the like is not required.

According to the second aspect of the present invention, the error data storage means divides the seek distance into a plurality of areas corresponding to the number of distances and stores the error data for each area. In addition to the operation of the configuration of claim 1, the storage capacity for storing data can be reduced as compared with the configuration in which the error data is finely stored for each seek distance.

According to the structure of claim 3, the error data storage means is adapted to store the error data for each seek direction of the optical disk. Therefore, in addition to the functions of the structures of claims 1 and 2, By dividing the error data by the seek direction, the difference in the error data due to the seek direction can be appropriately corrected, and the seek error can be further reduced.

According to the structure of claim 4, the error data storage means is divided into areas so that the difference between the error data of adjacent areas is substantially equal.
In addition to the effect of the configuration described above, the seek error variation due to the seek distance can be reduced, and the seek error can be reduced without dividing the area more than necessary, and the storage capacity for data storage can be reduced.

According to the structure of claim 5, the error data storage means is composed of a rewritable memory, and the updating means updates the error data in the error data storage means for each seek operation. In addition to the effect of the configuration of item 1, 2, 3 or 4, it is possible to cope with a change in error data due to a change with time of the device itself, a replacement of an optical disk, or the like.
The seek error can always be minimized.

According to the structure of claim 6, the updating means rewrites the error data so as to be the average value of the errors in the past plural seek operations. Therefore, in addition to the function of the structure of claim 5, , The average value is used even when the seek error becomes large due to accidental factors such as scratches, defects, and vibration of the optical disk, so the influence of one abnormality is reduced and stable seek operation is possible. Becomes

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS.

First, the configuration of an optical disc device equipped with a movement control device for an optical pickup according to this embodiment is shown in FIG.
It will be described based on. This optical disk device includes an optical disk 1, a spindle motor 2, an optical pickup 3, a feed screw 4, a rotary motor 5, a motor drive circuit 6, a track counter 7, a controller 8, an EEPROM 9, a ROM 10,
And a RAM 11 and the like.

The optical disk 1 is a disk-shaped recording medium in which information signals are recorded in a track shape together with address data, and the spindle motor 2 drives the optical disk 1 to rotate. The optical pickup 3 irradiates a track of the optical disc 1 with a light beam, and reads recorded information and servo signals from the reflected light.

The feed screw 4, the rotary motor (driving source) 5, and the motor drive circuit 6 constitute an optical pickup moving means, whereby the optical pickup 3 is movable in the radial direction of the optical disc 1. ing. The feed screw 4 is rotated by the driving force of the rotary motor 5 controlled by the motor drive circuit 6, so that the optical pickup 3
Can be moved a desired distance in the radial direction of the optical disc 1.

The track counter 7 includes an optical pickup 3
The number of tracks traversed by the light beam is counted from the signals that are input, such as the tracking error signal of the servo signal and the reflected light amount signal, which change as the light beam traverses the tracks, and the optical pickup 3 is moved from there. It is a moving distance detecting means for detecting a distance. Here, as the movement distance detecting means, a linear scale, a potentiometer, or the like can be used in addition to the track counter 7, but when the track counter 7 is used, the optical pickup 3 can be shared as a sensor, so that it can be attached externally. It is not necessary to provide a sensor separately, and the cost can be reduced. Moreover, in terms of detection accuracy, since the track counter 7 can detect in track pitch units, detection can be performed with high accuracy on the order of microns. However, when the track counter 7 is used, the unit of distance is represented by the number of tracks.

The controller 8 is a CPU (Central Proc
essing unit) and peripheral LSI (Large Scale Integrated
Circuit) and the like, and together with the interface with the outside of the device, performs correction calculation of the seek distance and control commands to the above-mentioned optical pickup moving mechanism. That is, it functions as the seek distance calculating means, the seek distance correcting means, the drive control means, and the updating means of the present invention. The control command includes an acceleration command, a deceleration command, and a stop command, and the control signal is given to the motor drive circuit 6.

The above-mentioned EEPROM 9, ROM 10, and RAM 11 are connected to the controller 8. Among them, the ROM (Read Only Memory) 10 is a memory for storing programs, and the RAM (Random Access Memory).
ry) 11 is a memory for storing program variables. On the other hand, EEPROM (Electrically Erasable Programmab
The le read only memory) 9 is an electrically erasable and rewritable type, and is a memory for storing an error data table described later. That is, the error data storage means stores an error distance, which is the difference between the specified seek distance and the distance actually searched by the optical pickup, in accordance with the seek distance. In this embodiment, the EEP is used as a memory for storing the error data table.
Although the ROM 9 is used, it may be composed of a static RAM with a battery backup or a flash memory. By storing the error data table in such a non-volatile memory, it is possible to retain the error data updated each time the seek is performed, even after the power is turned off.
The seek error can always be corrected in the most optimal state.

Next, the error data table stored in the EEPROM 9 will be described. Table 1 shows an example of the error data table of the present embodiment. Before explaining this, the points to be considered when creating the error data table will be explained.

The cause of the seek error will be described. As described above, overrun is a main cause of seek error in the case of performing simple control of giving an acceleration command, a deceleration command, and a stop command. In FIG. 2, the rotary motor 5 is turned on at time 0, and the rotary motor 5 is turned on after a certain period of time.
It shows the progress of the moving speed of the optical pickup 3 when FF is performed. After the rotary motor 5 is turned on, the moving speed of the optical pickup 3 gradually increases, and when the maximum number of rotations of the rotary motor 5 is reached thereafter, the moving speed of the optical pickup 3 becomes constant. After that, when the rotary motor 5 is turned off, the moving speed of the optical pickup 3 gradually decreases, and finally the moving speed becomes zero. The fact that the moving speed does not become 0 immediately after turning off the rotary motor 5 is due to the inertia of the optical pickup 3 and the rotary motor 5. Turn the rotary motor 5 to O
The distance traveled until the moving speed of the optical pickup 3 becomes 0 after FF (indicated by diagonal lines in the figure), that is, overrun, is the mass of the movable portion of the rotary motor 5 and the braking force acting on the movable portion. However, it is impossible to reduce the overrun to zero.

The error data stored in the error data table will be described. The relationship between the seek distance and the seek error is shown in FIG. Since the seek error in this figure is a value when the rotary motor 5 is turned off after the optical pickup 3 is moved by the designated seek distance, it can be considered that the seek error is almost equal to overrun. As is clear from the figure, when the seek distance is small, the seek error is small, and the seek error increases as the seek distance increases. Then, when the seek distance exceeds a certain level, the seek error becomes constant. This corresponds to the above-mentioned graph of the moving speed of the optical pickup 3 shown in FIG. 2, and when seeking to a short distance, the rotation motor 5 is turned off when the moving speed of the optical pickup 3 is small, so that there is a seek error. At a small distance, the rotary motor 5 is turned off when the moving speed of the optical pickup 3 is saturated at a long distance, and it is considered that the seek error also approaches a constant value. Although not shown, the graph showing the relationship between the seek distance and the seek error differs depending on the seek direction. This is because the characteristics such as the maximum rotation speed and the rising time of the rotary motor 5 are different between forward rotation and reverse rotation, and the tension of a cable (not shown) connected to the optical pickup 3 also acts in the moving direction of the optical pickup 3. Is the cause. Therefore, even if the seek distance is the same, the seek error varies depending on the seek direction.

A method of storing the relationship between the seek distance and the seek error will be described. When the relationship between the seek distance and the seek error is stored, the seek error for all seek distances can be stored, but not only the required storage capacity becomes very large, but also every seek operation is performed. When error data is updated and optimized, it takes a very long time to complete the optimization of all data. Therefore, as shown in FIG. 3A, it is preferable to divide the zone into several zones (areas) according to the seek distance and divide the error data for each zone to be stored. Then, at this time, by dividing the seek error so that the seek errors have substantially equal intervals, it is possible to reduce the variation of the seek error with a small storage capacity.

As an example, a comparison will be made with the case where the seek distance is set at equal intervals and the zone is divided. As shown in FIG. 3B, when the seek distances are set at equal intervals, the range of seek error in one zone varies depending on the seek distance. When the seek distance is small, for example, zone 1 can have a range of possible seek error. Is wide and the seek distance is large, the range of possible seek error is narrow in zone 6, for example. Since one error data represents the seek error of the entire zone, the narrower the range of error data that can be taken in one zone, the more accurate the correction can be performed. Therefore,
If the range of the seek error differs depending on the zone as shown in FIG. 7B, the correction accuracy also varies from zone to zone. Specifically, the seek error after correction is large in zone 1, and the seek error after correction is small in zone 6. For the above reasons, in this embodiment, as shown in FIG. 9A, the seek error is dispersed with a small storage capacity by dividing the zones so that the seek errors are at substantially equal intervals. ing.

[0033]

[Table 1]

In the error data table of this embodiment shown in Table 1 created in consideration of the above points, the zone number 1
It is divided into six zones up to 6 and error data for the inner and outer circumferences of the optical disc 1 is stored in each zone. Each zone is divided so that the seek error is almost equal, and thus the seek distances of the zones are not equal intervals.

As the error data to be stored in such an error data table, it is possible to store the newest error data, but in the present embodiment, the average value of the errors during the past plural seeks. Is stored as error data. By doing so, the average value is used even when the seek error becomes large due to an accidental factor such as a scratch, a defect, or vibration, so that the influence of one abnormality can be reduced. Stable seek operation is possible.

Next, the flow of the seek operation in the seek controller provided in the optical disk device of this embodiment will be described with reference to FIG.
A description will be given based on the flowchart.

First, the seek direction and seek distance are calculated based on the current address and the designated address (S
1), the zone number corresponding to the seek distance obtained in S1 is acquired (S2). Next, based on the seek direction obtained in S1 and the zone number obtained in S2, the corresponding error data in the error data table is obtained (S3
・ S4 ・ S5). Then, a calculation for correcting the seek distance is performed (S6). That is, as described above, since the seek error is mainly caused by the overrun, it may be corrected so that the rotary motor 5 is turned off earlier by the amount of the overrun distance, that is, the error data. Therefore, as the correction calculation, the error data obtained in S4 or S5 is subtracted from the seek distance obtained in S1.

Next, the track counter 7 is cleared and a control signal is output to the motor drive circuit 6 to move the optical pickup 3 (S7). After that, the process waits until the count value of the track counter 7 matches the correction seek distance obtained in S6.
A control signal is output so as to perform FF (S9).

Then, the error data table is updated so as to reflect the seek error result in this seek operation (S10). That is, since the count value of the track counter 7 when the optical pickup 3 is finally stopped is the distance actually seeked, the difference is calculated by comparing this with the corrected seek distance calculated in S6. An average value is obtained by averaging the error data of the corresponding zone number several times in the past, and the error data table is updated with this as the latest error data. Through such operations, one seek operation is completed.

FIG. 5 shows the result of an experiment in which the seek error was examined in accordance with the seek distance in the optical disc device equipped with the optical pickup movement control device of the present embodiment (data indicated by circles in the figure). . Here, the result is obtained by performing random seek 100 times after optimizing the error data table having 6 zones. Then, as a reference, the results of the same experiment without correction for the seek distance are shown (data shown by ● and ■).

As is clear from the figure, when the seek distance is not corrected, the seek error is small when the seek distance is small, and the seek error is large when the seek distance is large. Also, in this case, seek () toward the outer circumference and seek () toward the inner circumference with respect to the optical disc 1.
Then, the seek error is different even with the same seek distance.
The seek error without correction was 88 tracks on average.

On the other hand, in the case of this embodiment in which the correction is performed, the average seek error value is about 7 tracks, and it can be seen that the seek error can be reduced by one digit as compared with the case without correction. Further, it can be seen that the seek error is small and the dependence on the seek distance and the seek direction is not observed, and the stable seek operation is possible.

As described above, in this embodiment, the seek error is stored according to the seek distance, and when the address is designated, the corrected seek distance is calculated immediately, and the movement of the optical pickup 3 is performed based on the calculated seek distance. Are controlled. Therefore, unlike the prior art, it is not necessary to separately provide a circuit or a sensor for obtaining the moving speed of the optical pickup, and a high-speed arithmetic means for predicting a sequential stop distance during seek operation may be required. In other words, overrun can be reduced, seek error can be reduced, and seek time can be shortened.

Further, since the error data table is rewritten for each seek operation, it is possible to cope with a change in error data due to a change with time of the apparatus itself or a replacement of the optical disc 1, and the seek error can be always minimized. Moreover, in the present embodiment, since the error data is updated so that it becomes the average value of the errors during the past multiple seek operations, the seek error may occur due to accidental factors such as scratches, defects, and vibrations of the optical disc 1. Since the average value is used even when it becomes large, the influence of one abnormality becomes small, and stable seek operation becomes possible.

Instead of using the non-volatile memory as the error data storage means as in this embodiment, a RAM may be used as the error data storage means and the error data table may be stored in the RAM. In this case, since the correct error data is not stored in the RAM when the power is turned on, the seek error cannot be corrected. It is possible to collect the error data by performing a test seek operation immediately after the power is turned on, but it takes time to collect all the error data. Therefore, it is preferable to copy the standard error data from the ROM to the RAM when the power is turned on. that way,
The seek error can be made relatively small immediately after the power is turned on, and the seek error can be minimized each time the seek error is repeated. FIG. 6 shows this configuration. The ROM and the RAM can be shared with the ROM 10 and the RAM 11 for executing the program, and a more inexpensive device can be realized as compared with the case where the nonvolatile RAM is used.

[0046]

As described above, the movement control device for an optical pickup according to the first aspect of the present invention includes seek distance calculating means for obtaining a seek distance for the optical pickup to seek an instructed address, and A moving distance detecting means for detecting a moving distance of the pickup, an error data storing means for storing error data consisting of a difference between a specified seek distance and a distance actually seeked by the optical pickup in accordance with the seek distance, and the above-mentioned seek Seek distance correcting means for reading out error data corresponding to the seek distance obtained by the distance calculating means from the error data storage means, correcting the seek distance based on the read error data to obtain a corrected seek distance, and the seek distance correction. Correction seek distance obtained by the means and movement distance information of the optical pickup obtained by the movement distance detection means Based on a configuration in which a driving control means for controlling the optical pickup moving means.

As a result, it is possible to reduce the overrun that is moved beyond the specified address, reduce the seek error, and shorten the seek time. In this case, since it is not necessary to obtain the moving speed of the optical pickup with high accuracy, a circuit or a sensor for obtaining the moving speed of the optical pickup is unnecessary, and the correction is performed at the time when the seek destination address is specified. Since the seek distance is required,
There is no need for calculation for predicting the sequential stop distance during seek operation, and high-speed calculation means is unnecessary. As a result, it is possible to provide a high-performance optical pickup movement control device with a short seek time at a low cost.

As described above, the movement control device for an optical pickup according to a second aspect of the present invention is the movement control device for an optical pickup according to the first aspect, wherein the error data storage means sets the seek distance to a distance number. The error data for each area is stored by being divided into a plurality of areas according to the above.

As a result, in addition to the effect of the structure of claim 1, the storage capacity for data storage can be reduced as compared with the structure in which the error data is finely stored for each seek distance. Play.

As described above, the movement control device of the optical pickup according to claim 3 of the present invention is the movement control device of the optical pickup according to claim 1 or 2, wherein the error data storage means stores error data. The configuration is such that the seek direction of the optical disc is also stored.

Thus, in addition to the effects of the first and second aspects, by dividing the error data according to the seek direction, it is possible to appropriately correct the difference in the error data due to the seek direction. This has the effect of further reducing the seek error.

As described above, the movement control device for an optical pickup according to a fourth aspect of the present invention is the movement control device for an optical pickup according to the second aspect, wherein the error data storage means is provided in each of adjacent areas. The region is divided so that the difference between the error data is almost equal.

As a result, in addition to the effect of the structure of claim 2, the seek error variation due to the seek distance is reduced, and the seek error can be reduced without dividing the area more than necessary, and data is stored. This has the effect of reducing the storage capacity of.

As described above, the movement control device for an optical pickup according to a fifth aspect of the present invention is as described above.
Alternatively, in the movement control device of the optical pickup described in 4,
The error data storage means is composed of a rewritable memory, and is provided with update means for updating the error data in the error data storage means for each seek operation.

As a result, the above-mentioned claim 1, 2, 3 or 4
In addition to the effect of the above configuration, it is possible to cope with a change in error data due to a change with time of the apparatus itself, a replacement of an optical disk, and the like, and it is possible to always minimize a seek error.

As described above, the movement control device for an optical pickup according to a sixth aspect of the present invention is the movement control device for an optical pickup according to the fifth aspect, wherein the updating means has error data of a plurality of times in the past. The configuration is such that the average value of the error during seek operation is rewritten.

As a result, in addition to the effect of the structure of claim 5, the average value is used even when the seek error becomes large due to accidental factors such as scratches, defects and vibration of the optical disk. The effect of one abnormality is reduced, and a stable seek operation is possible.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a block diagram of an optical pickup movement control device.

FIG. 2 is a graph showing a moving speed of an optical pickup during a seek operation.

FIG. 3A and FIG. 3B are explanatory diagrams showing a relationship between a seek distance and a seek error, and a zone division method.

FIG. 4 is a flowchart showing a flow of a seek operation in the optical pickup movement control device.

FIG. 5 is a graph showing an experimental result of examining a seek error in the movement control device of the optical pickup.

FIG. 6 shows another embodiment of the present invention and is a block diagram of a movement control device for an optical pickup.

[Explanation of symbols]

1 Optical Disc 3 Optical Pickup 4 Feed Screw (Optical Pickup Moving Means) 5 Rotation Motor (Optical Pickup Moving Means) 6 Motor Drive Circuit (Optical Pickup Moving Means) 7 Track Counter (Movement Distance Detection Means) 8 Controller (Seek Distance Calculation Means, Seek distance correction means, drive control means, update means) 9 EEPROM (error data storage means) 10 ROM 11 RAM

Claims (6)

[Claims] 1. An optical pickup which reads a recorded information by irradiating an optical disc on which information including address information is recorded in a track shape, and an optical pickup which supports the optical pickup and moves it across a track of the optical disc. In an optical pickup movement control device having an optical pickup moving means, a seek distance calculating means for obtaining a seek distance for the optical pickup to seek to an instructed address, and a moving distance detecting means for detecting the moved distance of the optical pickup. Means, error data storage means for storing error data consisting of the difference between the specified seek distance and the distance actually seeked by the optical pickup according to the seek distance, and the seek distance calculated by the seek distance calculating means. Read the error data from the error data storage means,
Seek distance correcting means for correcting the seek distance based on the read error data to obtain a corrected seek distance, the corrected seek distance obtained by the seek distance correcting means, and the movement of the optical pickup obtained by the moving distance detecting means. A movement control device for an optical pickup, comprising: drive control means for controlling the optical pickup movement means based on distance information. 2. The error data storage means divides the seek distance into a plurality of areas according to the number of distances and stores the error data for each area. Optical pickup movement control device. 3. The movement control device for an optical pickup according to claim 1, wherein the error data storage means is adapted to store the error data for each seek direction of the optical disk. 4. The movement control device for an optical pickup according to claim 2, wherein the error data storage means is divided into areas such that differences in error data between adjacent areas are substantially equal to each other. 5. The error data storage means comprises a rewritable memory, and update means for updating the error data in the error data storage means for each seek operation is provided. The movement control device for an optical pickup according to claim 1, 2, 3, or 4. 6. The movement control device for an optical pickup according to claim 5, wherein the updating means rewrites the error data so that the error data becomes an average value of errors during a plurality of seek operations in the past.