Optical disk apparatus controlling focus and tracking drive...

Details Optical disk apparatus controlling focus and tracking drive... Optical disk apparatus controlling focus and tracking drive...

2006-11-13

2010-12-07

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047530, C369S044260, C369S044340

Reexamination Certificate

active

07848189

ABSTRACT:
It is an optical disk apparatus that comprises: a laser drive device for outputting a test power larger than a prescribed value in a gap section; an optical pickup for forming a beam spot on a disk and detecting reflected light; a focus error detector for detecting position shift between a recording face of the information recording medium and the beam spot; a focus control device for controlling the position shift; and a focus drive device for driving an objective lens in directions far from and close to the disk, wherein, in the gap section, the focus drive device keeps a focus drive output level of right before the laser drive device outputs the test power, and sets a recording power such that the emitted light power becomes the prescribed value.

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patent: 2005/0041549 (2005-02-01), Lee
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patent: 2001-014691 (2001-01-01), None
patent: 2002-074695 (2002-03-01), None

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