Focus draw-in system for optical disc device

Details Focus draw-in system for optical disc device Focus draw-in system for optical disc device

1993-10-18

1995-05-09

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, G11B 700

Patent

active

054146828

ABSTRACT:
A focus draw-in method for an optical disc device, includes the steps of detecting a peak of a focus error signal, and after detecting the peak, applying a driving force to an optical device in a direction of the detected peak until the relative speed between a disc face and the optical device becomes small, and effecting focus control at a time point when the relative speed between the disc face and the optical device has become small. By the method noted above, the focus draw-in function with a high performance capable of effecting an efficient draw-in even when the relative speed between the disc face and the optical device is large, may be advantageously realized.

REFERENCES:
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patent: 5020045 (1991-05-01), Smart et al.
patent: 5142517 (1992-08-01), Takahashi
patent: 5187696 (1993-02-01), Ishii et al.

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