Device and method for controlling movement of focusing lens for

Details Device and method for controlling movement of focusing lens for Device and method for controlling movement of focusing lens for

1984-11-01

1987-10-27

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

250201, G11B 700

Patent

active

047034661

ABSTRACT:
A device and method for controlling the movement of a focusing lens of an apparatus for reading an optical disk in which the focusing lens is positively prevented from striking the surface of the disk. The presence or absence of the establishment of a focus servo control mode is detected when the focusing lens is moved from a most wide position to the vicinity of the normal operative position. If the focus servo control mode is not established when the focusing lens has been moved to the vicinity of the normal operative position, the focusing lens is then moved away from the disk. Then, the focusing lens is moved towards the disk one more time, and the procedure is repeated.

REFERENCES:
patent: 4128847 (1978-12-01), Roullet et al.
patent: 4541084 (1985-09-01), Oku et al.
patent: 4546460 (1985-10-01), Ando

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