Optical disk apparatus, focus-value correcting method, and...

Details Optical disk apparatus, focus-value correcting method, and... Optical disk apparatus, focus-value correcting method, and...

2005-01-11

2005-01-11

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053370, C369S275300

Reexamination Certificate

active

06842408

ABSTRACT:
An optical head2and a matrix circuit3cooperate, generating a signal form the light reflected from an optical disk1. An evaluation-function generating circuit5generates an evaluation function from the signal reproduced from the optical disk1. A controller6sets an initial focus value at a point where the evaluation function is minimal. The initial focus value is set in a servo circuit7. The controller6sets an observation point deviating from the point at which it has set the initial focus value. The controller6corrects the initial focus value set in the servo circuit7.

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