Optical disc device, optical pickup control method and...

Details Optical disc device, optical pickup control method and... Optical disc device, optical pickup control method and...

2005-07-11

2008-09-23

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S094000

Reexamination Certificate

active

07428201

ABSTRACT:
In the present invention, an optical pick-up (4) applies an optical beam to an optical disc (2) on which one or more information recording layers (20A) and (20B) are laminated in the direction of thickness through an objective lens (34) and detects a reflected light from one of the information recording layers laminated on the optical disc. A first photodetecting part (81) for detecting the reflected light from the one information recording layer and a second photodetecting part (82) composed of one or more light receiving surfaces for detecting a stray light from other information recording layers are mounted on a light receiving element (52). The number of the information recording layers laminated on the optical disc (2) is discriminated on the basis of the intensity of the stray light detected by the second photodetecting part (82). The optical pick-up (4) is controlled in accordance with the discriminated number of the information recording layers before a focus is controlled.

REFERENCES:
patent: 6940794 (2005-09-01), Hayashi
patent: 3-113837 (1991-05-01), None
patent: 8-185635 (1996-07-01), None
patent: 9-259456 (1997-10-01), None
patent: 11-353787 (1999-12-01), None
patent: 2005-025923 (2005-01-01), None

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