Optical disc apparatus and method of setting defocus value...

Details Optical disc apparatus and method of setting defocus value... Optical disc apparatus and method of setting defocus value...

2006-11-15

2010-02-16

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044250

Reexamination Certificate

active

07663988

ABSTRACT:
An optical disc apparatus is disclosed that comprises a jitter value detecting circuit that detects a jitter value based on the signal read out from an optical disc; and a defocus value setting circuit that adjusts a defocus value used for moving an objective lens along the direction of a light axis when focusing of the objective lens to the optical disc is performed, based on the signal that has gone through the jitter value detecting circuit, and causes a defocus adjustment to be made based on the defocus value.

REFERENCES:
patent: 7283438 (2007-10-01), Ukawa
patent: 7-262584 (1995-10-01), None
patent: 10-228652 (1998-08-01), None
patent: 2002-342948 (2002-11-01), None

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