Techniques for controlling beam position and focus in optical di

Details Techniques for controlling beam position and focus in optical di Techniques for controlling beam position and focus in optical di

1990-04-12

1993-10-05

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4434, 369 50, G11B 7095

Patent

active

052511944

ABSTRACT:
An optical disk drive for recording and reproducing information on an optical disk medium includes a servo circuit for controlling tracking of a light beam on a predetermined track and a servo circuit for controlling focus of the light beam on the disk surface. The disk surface is divided into a plurality of regions, and calibration values for adjusting the servo circuits are determined in each region. The calibration values are stored in a memory and are used to adjust the servo circuits during tracking on a predetermined track. The calibration values include tracking offset values, focus offset values, servo deviation threshold values and sensor gain values. A number of techniques are disclosed for automatically determining the calibration values.

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"A Precise Servo In An Optical Disk Memory", System and Control, vol. 27, No. 11, pp. 704-710, 1983.

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