Method for checking the existence of an optical disk using a...

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

Reexamination Certificate

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Details

C369S044270, C369S044410, C369S053220, C369S053230, C369S053280, C369S053370, C369S094000

Reexamination Certificate

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07012858

ABSTRACT:
A method for checking the existence of an optical disk using a focusing signal is provided. The method in accordance with the present invention prevents misjudgement of the existence of an optical disk which is caused by noise contained in a focus error signal or by the low reflection ratio of a disk.

REFERENCES:
patent: 5079755 (1992-01-01), Hangai et al.
patent: 5138595 (1992-08-01), Wachi
patent: 5140575 (1992-08-01), Fushiki
patent: 5351226 (1994-09-01), Mizumoto et al.
patent: 5903531 (1999-05-01), Satoh et al.
patent: 5966357 (1999-10-01), Ryoo
patent: 6058082 (2000-05-01), Hwang
patent: 6240054 (2001-05-01), Takeya et al.

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