Tracking system with dual differential signals with fraction...

Details Tracking system with dual differential signals with fraction... Tracking system with dual differential signals with fraction...

2008-06-10

2008-06-10

Patel, Gautam R. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

07385888

ABSTRACT:
Tracking system for guiding an optical beam on tracks on an optical disc, said tracking system comprising a photodetector (A1, A2) for detecting optical beams derived from said optical beam, said photodetector generating a first output signal (A) and a second output signal (B), said tracking system comprising first processing means for generating a first differential signal (PP(DC)) corresponding to the low-frequency part of a difference between said first and second output signals. The tracking system comprises second processing means for generating a tracking error signal (PP(AC/DC)) defined by the addition of said first differential signal (PP(DC)) to a second differential signal (PP′(AC)), said second differential signal corresponding to a fraction of the difference in amplitude of the high-frequency components of said first and second output signals. Use: Optical disc player/writer.

REFERENCES:
patent: 5130963 (1992-07-01), Kusano et al.
patent: 5282192 (1994-01-01), Yamada et al.
patent: 5448551 (1995-09-01), Miyagawa et al.
patent: 5616390 (1997-04-01), Miyagawa et al.
patent: 7170837 (2007-01-01), Mashimo

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