JPS6214332A - Position controller for optical pickup for compact disk - Google Patents

Abstract

PURPOSE:To omit the error control in terms of hardware by measuring and recording previously the degree of an error produced by the position control of an optical pickup and moving this pickup in an access mode with correction by means of said recorded degree of error through an error degree correcting device. CONSTITUTION:In an access mode of an optical pickup, the elapsed time to receive an access is converted into the position value of a disk by an elapsed time/position converter 13. Then an error degree corrector 16 performs the correction by the value of an error degree storage device 15. An optical pickup driver 17 moved an optical pickup device 11 by means of said corrected value and the value delivered from an optical pickup position detector 12. Thus the corrector 16 corrects the output given from the elapsed time/position converter with an error degree produced by the position control of the optical pickup. This omits the control of the detector 12 and the driver 17 in terms of hardware.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a compact disc light 21 which allows the position control of an optical pickup of a compact disc player to be performed without any adjustment of an optical pickup position detection device or the like.

The present invention relates to a position control device for a medical pickup.

BACKGROUND OF THE INVENTION In recent years, the position control of the optical pickup of a compact disc player is required to have improved functionality and accuracy, and to have a simple mechanism.

An example of the above-mentioned conventional optical pickup position control device for the compact disc player will be described with reference to the drawings.

FIG. 2 shows a block diagram of a conventional optical pickup position control device for a compact disc player. In FIG. 2, 21 is an optical pickup device, 22
23 is an optical pickup position detecting device that detects the relative position of the optical pickup to the compact disc, and 23 is an optical pickup position detecting device that detects the position of the optical pickup relative to the compact disc. This is an optical pick-up drive device that moves an optical pickup device using the value output from a detection device.

The operation of the compact disc optical pickup position control device configured as described above will be described below.

First, when the elapsed time of the compact disc to be accessed by the optical pickup is specified, the elapsed time-position conversion device 23 converts it into a value of the position in the radial direction of the compact disc. In the optical pickup driving device 24, the value outputted from the optical position detection device 22 matches the value outputted from the elapsed time-position conversion device 23 described above. t: Move the sea urchin optical pickup device 21.

Problems to be Solved by the Invention However, in the above configuration, for example, when a potentiometer is used in the optical pickup position detection device 22, the relative position of the potentiometer with respect to the compact disc is adjusted, and the optical pickup is detected at an arbitrary elapsed time. The output value obtained from the up position detection device 22 must be matched with the output value obtained from the elapsed time-position conversion device 23 at the same light overtime. However, there was a problem in that it was necessary to take into account the errors caused by the optical pickup drive system @24.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a position control device for an optical big amplifier for a compact disc, which does not require adjustment of a device for detecting the relative position of the optical amplifier with respect to the compact disc.

Means for Solving the Problems In order to solve the above problems, the position control device for the optical big amplifier for compact discs of the present invention measures and records in advance the amount of error that occurs in the position control of the optical pickup, and then accesses it. Sometimes, it is equipped with an error amount correction device that corrects the value and moves the optical pickup.

For production The present invention provides an optical picker using the above-described means.

This eliminates the need for hardware adjustments for errors occurring in the drop position detection device, etc.

6 to 7 Embodiment A position control device for an optical pickup for a compact disc according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a position control device for an optical pickup for a compact disc according to an embodiment of the present invention. In FIG. 1, 11 is an optical pickup device, 12 is an optical pickup position detection device that detects the relative position of the optical pickup with respect to the compact disc, and 13 is the elapsed time during which the position on the compact disc is recorded on the compact disc. An error calculation device 14 calculates the difference between the elapsed time specified in the elapsed time-position converter 13 and the elapsed time read from the disc by the optical pickup device 11. , 16 is an error amount storage device for storing the value calculated by the error amount calculation device 14, and 16 is a correction device for correcting the value obtained by the elapsed time-position conversion device 13 with the error value stored in the error amount storage device 15. The error amount correction device 17 calculates the elapsed time specified by the elapsed time-position conversion device 13,
This is an optical pickup driving device that moves the optical pickup device 11 using the value corrected by the error amount correction device 16 and the value output from the optical pickup position detection device 12.

The operation of the position control device for the optical big amplifier for compact discs constructed as described above will be explained below with reference to FIG.

First, an arbitrary elapsed time is specified, and the elapsed time-position conversion device 13 converts it into a value of the position in the radial direction of the compact disc. Next, the error amount correction device 16 outputs this value as it is. Then, the optical pickup driving device 17 moves the optical pickup mounting 11 so that the value output from the optical pickup position detection device 12 matches the value output from the error amount correction device 16. The optical pickup device 11 reads the elapsed time from the disk after the movement.

Then, the error amount calculation means 14 calculates the error i#f l generated in the optical pickup position detection device 12 and the optical pickup 7/pickup drive device 17 from this value and the elapsed time value specified by the elapsed time-position conversion device 13. ') put out. This value is stored in the error storage device 16.

When accessing the optical pickup, the elapsed time to be accessed is first converted into a disk position value by the elapsed time position converter 13, and then the error meter storage device 15 converts the elapsed time to a disk position value.
The error M correction device 16 corrects the value. The optical pink-up drive device 17 moves the optical pickup device 11 using this corrected value and the value output from the optical system bias position device 12.

According to this embodiment, as shown in FIG. There is no need for hardware adjustments to the optical pickup position detection device or the optical pick end drive device.

Note that in this embodiment, the value output from the elapsed time-position conversion device 13 is corrected by the error amount correction device 16, but the value output from the optical pickup position detection device 12 may also be corrected by the same device. .

It's a good idea to measure and store the amount of error in advance at just one point, but it goes without saying that the greater the number, the better the accuracy will be. As the position error value to be stored, the elapsed time error value may be used as in this embodiment.

As described above, the present invention provides an error amount correction device that measures and stores in advance the amount of error that occurs in position control of the optical pickup, and corrects the amount using that value when accessing to move the optical pickup. This eliminates the need for manual adjustment of the optical pickup position detection device, etc. during the manufacture of this device, and also makes it possible to improve accuracy and simplify the mechanism.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a position control device for an optical pickup for optical discs in an embodiment of the present invention, and FIG.
The figure is a block diagram of a conventional position control device for an optical pickup for a compact disc. Go to 9-2 11... Optical pickup device, 12...
...Optical pickup position detection device, 13...
Elapsed time-position conversion device, 14...Error amount calculation device, 15...Error amount storage device, 16...
...Error amount correction device, 17... Optical pickup drive device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] An elapsed time-position converter that converts the elapsed time value recorded on a compact disc into a position value on the compact disc, and an elapsed time-position converter that converts the elapsed time value recorded on the compact disc into a position value on the compact disc. An error amount calculation device that calculates the amount of position error that occurs when the optical pickup device is moved, an error amount storage device that stores the position error value calculated above, and an error amount calculation device that calculates the amount of position error that occurs when the optical pickup device is moved. 1. A position control device for an optical pickup for a compact disc, comprising: an error correction device that corrects the position error using a position error value stored in a storage device.