Optical disk recording apparatus having push-pull signal...

Details Optical disk recording apparatus having push-pull signal... Optical disk recording apparatus having push-pull signal...

2005-05-10

2005-05-10

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044360, C369S047250

Reexamination Certificate

active

06891782

ABSTRACT:
Push-pull signal is created on the basis of reflected-light detection signals output from four divided light receiving elements that receive a reflection of a recording laser light beam off an optical disk. The push-pull signal is sent to a gain variation circuit. The push-pull signal is normalized by setting the gain of the gain variation circuit to a low level in response to a mark forming section of a recording signal, but to a high level in response to a blank forming section of the recording signal. Wobble detection and pre-pit detection are performed on the basis of the normalized push-pull signal.

REFERENCES:
patent: 5130970 (1992-07-01), Ohta
patent: 5508991 (1996-04-01), Onigata et al.
patent: 5742578 (1998-04-01), Kumai et al.
patent: 6487149 (2002-11-01), Yokoi et al.
patent: 0880132 (1998-11-01), None
patent: 9326122 (1997-12-01), None
patent: 9-326122 (1997-12-01), None

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