Optical pickup for detecting thickness variation of a...

Details Optical pickup for detecting thickness variation of a... Optical pickup for detecting thickness variation of a...

2006-04-25

2006-04-25

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S112010

Reexamination Certificate

active

07035186

ABSTRACT:
An optical pickup for a recording medium includes a light beam division and detection unit including receiving portions dividing an incident light beam reflected on the recording medium into a first light beam portion and a second light beam portion around the first light beam portion and converting the first and second light beam portions into first and second detection signals, respectively. A thickness variation detection circuit detects a variation in thickness of the recording medium according to the first and second detection signals and outputs a thickness variation signal indicative thereof.

REFERENCES:
patent: 4920527 (1990-04-01), Maeda
patent: 5841754 (1998-11-01), Lee et al.
patent: 6353582 (2002-03-01), Kikuchi
patent: 6510111 (2003-01-01), Matsuura
patent: 6730896 (2004-05-01), Yamada
patent: 2000-57616 (2000-02-01), None
patent: 2000-182254 (2000-06-01), None
patent: WO 00/39792 (2000-07-01), None
Chinese Office Action in corresponding Chinese Application.

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