Method and apparatus for adjusting target position of focusing o

Details Method and apparatus for adjusting target position of focusing o Method and apparatus for adjusting target position of focusing o

1989-08-09

1992-02-18

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

050900030

ABSTRACT:
In an apparatus which focuses a light beam on a rotating recording medium in order to record and/or reproduce information, the light beam on the recording medium is focus controlled so that a prescribed focusing condition is accomplished. By storing a relation between a target position of focus control and the amplitude of a reproduced signal and by obtaining an optimum target position of focus control is accordance with such stored information, the target position of the focus control can be precisely and quickly adjusted, thereby properly controlling the light beam to be focused on the recording medium.

REFERENCES:
patent: 4692915 (1987-09-01), Moriya
patent: 4707648 (1987-11-01), Minami
patent: 4878135 (1989-10-01), Makino

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