Focus search apparatus and method

Details Focus search apparatus and method Focus search apparatus and method

2003-10-02

2009-11-10

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044340, C369S044350

Reexamination Certificate

active

07616537

ABSTRACT:
Provided are a focus search apparatus and method for performing a focus search after moving an optical pickup to a focus-on point according to a signal output from a sine wave generator so that a stable and smooth focus search is performed. In the focus search method, a sine wave is generated in response to a focus search command. The focus search is performed using an optical pickup in response to the sine wave. The optical pickup is driven in response to an amplitude of the sine wave during the focus search and in response to a filtered focus error signal during a focus servo.

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Machine translation of JP-2000348354 published in Jan. 15, 2000 by Endo Hideyasu.
First Office Action and English-language translation issued Sep. 8, 2006 in counterpart Chinese application 200310114805.0.

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