Method and apparatus for leading-in focus servo by moving the ob

Details Method and apparatus for leading-in focus servo by moving the ob Method and apparatus for leading-in focus servo by moving the ob

1989-03-23

1991-10-22

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369 4429, G11B 700

Patent

active

050602152

ABSTRACT:
A focus servo lead-in method is implemented where the focus servo loop is first in an open state. An objective lens located at a position separated by a predetermined distance from the recording surface of a disk is first moved toward the recording surface at a high velocity. At a predetermined time, the moving velocity is decreased to a lower velocity and the focus servo loop is brought to a closed state based on the level of the focus error signal obtained while the objective lens is moving at the lower velocity.

REFERENCES:
patent: 4541084 (1985-09-01), Oku et al.
patent: 4627041 (1986-12-01), Uemura
patent: 4769801 (1988-09-01), Funada et al.

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