Radial control method for a device for reproducing...

Details Radial control method for a device for reproducing... Radial control method for a device for reproducing...

2003-03-25

2008-12-02

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044270

Reexamination Certificate

active

07460456

ABSTRACT:
The invention relates to a radial slaving method and to a reproduction device implementing it for optical discs.In an optical head of a conventional reproduction device using a four-quadrant detector with four photodiode is distributed on either side of a direction parallel to the axis of the track, the individual signals of the photodiodes (d1to d4) are combined in order to obtain read signals along the two diagonals (diag1, diag2) by subtraction (21, 22).A phase comparison signal circuit (100) makes it possible to construct a radial error signal (Sr) by measuring the phase shift of the diagonal read signals.The invention applies in particular to phase discs with slightly phase-shifting marks.

REFERENCES:
patent: 4544838 (1985-10-01), Musha et al.
patent: 4785441 (1988-11-01), Tanaka et al.
patent: 5168485 (1992-12-01), Lehureau et al.
patent: 5172368 (1992-12-01), Lehureau
patent: 5396482 (1995-03-01), Lehureau
patent: 5659536 (1997-08-01), Maillot et al.
patent: 5872764 (1999-02-01), Lehureau et al.
patent: 6058093 (2000-05-01), Kato et al.
patent: 6256285 (2001-07-01), Coombs
patent: 6577561 (2003-06-01), Pirot et al.
patent: 6657930 (2003-12-01), Nomoto
patent: 7120107 (2006-10-01), Takahashi et al.
patent: 2805382 (2001-08-01), None
patent: 10021559 (1998-01-01), None
patent: 10269588 (1998-10-01), None
Machine translation to Fukushima et al. (JP 10-21559 A).
Abstract of FR 2805382 publication date Aug. 24, 2001, Philippe Graffouliere.

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