Optical disc apparatus switching focus point between layers

Details Optical disc apparatus switching focus point between layers Optical disc apparatus switching focus point between layers

2008-12-01

2010-12-07

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047520

Reexamination Certificate

active

07848190

ABSTRACT:
A focus jump technique enables focus control on recording layers of a disc in such a manner that its effect is not absorbed by disturbance or a variation in the movement speed of an objective lens. The technique involves monitoring level of a focus error signal and rejecting noise from the error signal. A speed sensor detects movement speed of an objective lens; and a speed control circuit generates a voltage for controlling the objective lens, based on the detected movement speed. Movement speed of the objective lens is detected during focus jump, a corresponding lens drive signal is generated, and an end position is determined from behavior of the error signal immediately before the end of the jump. A focus control is pulled, from a focus point corresponding to one recording layer, into a focus point corresponding to another recording layer forcibly in a stable manner.

REFERENCES:
patent: 5142516 (1992-08-01), Fennema
patent: 5289442 (1994-02-01), Van Rosmalen
patent: 5444682 (1995-08-01), Yamada et al.
patent: 5614938 (1997-03-01), Sugiyama et al.
patent: 5745461 (1998-04-01), Kawasaki
patent: 5754507 (1998-05-01), Nishikata
patent: 5757744 (1998-05-01), Akkermans
patent: 5835460 (1998-11-01), Nishikata
patent: 5881032 (1999-03-01), Ito et al.
patent: 5978328 (1999-11-01), Tanaka
patent: 6061310 (2000-05-01), Iida
patent: 6151280 (2000-11-01), Naohara et al.
patent: 6178145 (2001-01-01), Hayashi et al.
patent: 6252834 (2001-06-01), Kumagai
patent: 6298012 (2001-10-01), Watanabe et al.
patent: 6298019 (2001-10-01), Watanabe et al.
patent: 6298020 (2001-10-01), Kumagami
patent: 6400663 (2002-06-01), Okada et al.
patent: 6426924 (2002-07-01), Yamamiya
patent: 6584048 (2003-06-01), Tateishi et al.
patent: 6724697 (2004-04-01), Lee
patent: 6744709 (2004-06-01), Kobayashi
patent: 6756574 (2004-06-01), Higuchi
patent: 6982127 (2006-01-01), Kondo et al.
patent: 2002/0145952 (2002-10-01), Kono
patent: 2003/0076758 (2003-04-01), Nakamura et al.
patent: 2005/0030873 (2005-02-01), Sasaki
patent: 2005/0270932 (2005-12-01), Lee et al.
patent: 63-046625 (1988-02-01), None
patent: 01010431 (1989-01-01), None
patent: 02-223023 (1990-09-01), None
patent: 05-242490 (1993-09-01), None
patent: 09-050630 (1997-02-01), None
patent: 10-188294 (1998-07-01), None
patent: 10-269581 (1998-10-01), None
patent: 10-302272 (1998-11-01), None
patent: 11-345420 (1999-12-01), None
patent: 11-345421 (1999-12-01), None
patent: 2000-155954 (2000-06-01), None
patent: WO 01/43124 (2001-06-01), None

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