Signal detection method and apparatus and optical recording...

Details Signal detection method and apparatus and optical recording... Signal detection method and apparatus and optical recording...

2003-12-29

2008-09-02

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S043000, C369S044370, C369S044410

Reexamination Certificate

active

07420895

ABSTRACT:
A method and apparatus for detecting a signal to determine on-track/off-track and/or a track cross direction, using a detection signal corresponding to a reflected main light beam and detection signals respectively corresponding to reflected first and second sub light beams, and an optical recording and/or reproducing apparatus using the same are provided. When detection signals respectively corresponding to one side portions, in a direction corresponding to a radial direction of the optical information storage medium, of the respective main light beam and first and second sub light beams are referred to as a first main signal, a first sub signal, and a second sub signal, respectively, the method and apparatus include obtaining a first operational signal, which is used to determine on-track/off-track and/or a track cross direction, by performing a subtraction on the combination of the first and second sub signals, and the first main signal.

REFERENCES:
patent: 5708636 (1998-01-01), Takahashi et al.
patent: 5764605 (1998-06-01), Zucker et al.
patent: 5812505 (1998-09-01), Shimoda et al.
patent: 6778475 (2004-08-01), Izumi et al.
patent: 2001/0019520 (2001-09-01), Uemura et al.

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