JPH067412B2 - Position control device for optical pickup for compact disk - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position control device for an optical pickup for a compact disc, which does not require adjustment by an optical pickup position detection device or the like for position control of the optical pickup of a compact disc player.

2. Description of the Related Art In recent years, position control of an optical pickup of a compact disc player has been required to improve the function and accuracy and simplify the mechanism in time.

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

FIG. 2 is a block diagram of a position control device for a conventional optical pickup of a compact disc player. In FIG. 2, reference numeral 21 denotes an optical pickup device, 2
2 is an optical pickup position detecting device for detecting the relative position of the optical pickup with respect to the compact disc,
Reference numeral 23 is an elapsed time-position conversion device for converting the value of the elapsed time recorded on the compact disc into a position value on the compact disc, and 24 is the optical pickup position at the position designated by the elapsed time-position conversion device. The optical pickup driving device moves the optical pickup device by using the value output from the detection device.

The operation of the position control device for a compact disc optical pickup having the above-described structure will be described below.

First, when the elapsed time of the compact disc to be accessed by the optical pickup is designated, the elapsed time-position conversion device 23 converts the value into the value of the radial position of the compact disc. The optical pickup driving device 24 moves the optical pickup device 21 so that the value output from the optical pickup position detection device 22 matches the value output from the elapsed time-position conversion device 23.

Problems to be Solved by the Invention However, in the configuration as described above, when a potentiometer is used for the optical pickup position detection device 22, for example, the relative position of the potentiometer with respect to the compact disc is adjusted, and the optical pickup is moved at an arbitrary elapsed time. The output value obtained from the position detection device 22 and the output value obtained from the elapsed time-position conversion device 23 at the same elapsed time must match. Further, there is a problem that an error generated in the optical pickup driving device 24 must be taken into consideration.

In view of the above problems, the present invention provides a position control device for an optical pickup for a compact disc, which does not require adjustment of a device for detecting the relative position of the optical pickup with respect to the compact disc.

Means for Solving the Problems In order to solve the above problems, a position control device for an optical pickup for a compact disc according to the present invention measures and records an error amount caused by position control of the optical pickup in advance, and at the time of access. It is provided with an error amount correction device for correcting the value and moving the optical pickup.

Action The present invention eliminates the need for hardware adjustment of the error generated in the optical pickup position detection device and the like by the above-mentioned means.

Embodiments 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 is 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 when the position on the compact disc is recorded on the compact disc. An elapsed time-position conversion device that can be known more is a reference numeral 14, and an error amount calculation device 14 calculates a difference between the elapsed time designated by the elapsed time-position conversion device 13 and the elapsed time read from the disc by the optical pickup device 11. Reference numeral 15 denotes an error amount storage device that stores the value calculated by the error amount calculation device 14, and 16 corrects 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 performs the elapsed time designated by the elapsed time-position conversion device 13,
The optical pickup driving device 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 pickup for a compact disc configured as described above will be described below with reference to FIG.

First, an arbitrary elapsed time is designated, and the elapsed time-position conversion device 13 converts the value into the position value 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 7 moves the optical pickup device 11 so that the value output from the error amount correction device 16 matches the value output from the optical pickup position detection device 12. The optical pickup device 11 reads the elapsed time from the disc after the movement. Then, the error amount calculation means 14 calculates the error amount generated in the optical pickup position detection device 12 and the optical pickup drive device 17 from this value and the value of the elapsed time designated by the elapsed time-position conversion device 13. This value is the error amount storage device 15
Remembered in.

When the optical pickup is accessed, first, the elapsed time to be accessed is converted into the value of the position of the disk by the elapsed time-position conversion device 13, and then the error amount correction device 16 corrects the value of the error amount storage device 15. . The optical pickup driving device 17 moves the optical pickup device 11 using the corrected value and the value output from the optical system pickup position device 12.

As described above, according to the present embodiment, by providing the error amount correction device that corrects the output from the elapsed time-position conversion device with the error amount generated in the position control of the optical pickup,
It is not necessary to adjust the optical pickup position detecting device and the optical pickup driving device in terms of hardware when manufacturing this device.

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 be corrected by the same device. .

Also, the point that the amount of error is measured and stored in advance may be one point, but it goes without saying that the greater the number, the higher the accuracy. As the value of the position error to be stored, the value of the error of the elapsed time may be used as in the present embodiment.

As described above, according to the present invention, the error amount generated in the position control of the optical pickup is measured and stored in advance, and the error amount correction device that corrects the value when accessing and moves the optical pickup is provided. Therefore, it is possible to eliminate the need for hardware adjustment of the optical pickup position detection device and the like when manufacturing this device, and to improve accuracy and simplify the mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a position control device for an optical pickup for a compact disc in an embodiment of the present invention, and FIG. 2 is a block diagram of a position control device for an optical pickup for a conventional compact disc. . 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 driving device.

Claims (1)

[Claims] 1. An elapsed time-position conversion device for converting an elapsed time value recorded on a compact disc into a position value on a compact disc, and an elapsed time-position conversion device for arbitrary elapsed time. The error amount calculation device that calculates the amount of position error that occurs when the optical pickup device is moved to the calculated position, the error amount storage device that stores the value of the position error calculated above, and the movement amount when the optical pickup device is accessed. A position control device for an optical pickup for a compact disc, comprising: an error amount correction device that corrects an amount to be corrected by a position error value stored in an error amount storage device.