Focus control system

Details Focus control system Focus control system

1992-10-15

1994-11-08

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4434, 369 4435, 369 4429, 2502015, G11B 709

Patent

active

053633571

ABSTRACT:
The inventive focus control system for optical recording/playback apparatus performs the initial focus pull-in operation for bringing the focused beam spot right on the recording medium surface through the focus sweep operation. The light beam focus position is moved under velocity control based on the relative velocity between the focus position and the recording surface detected through envelope detection and differentiation of the signal produced from the reflected light beam from the recording medium surface.

REFERENCES:
patent: 5132948 (1992-07-01), Ishibashi
patent: 5233585 (1993-08-01), Deute et al.

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