Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-07-10
2007-07-10
Young, Wayne (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
Reexamination Certificate
active
10784318
ABSTRACT:
A tracking error signal generation device includes a splitting and convergence section for splitting an optical beam into a main beam and a sub beam; a two-portion main beam detection section for detecting the main beam; a main beam push-pull signal generation section for generating a main beam push-pull signal; a two-portion sub beam detection section for detecting the sub beam; a sub beam push-pull signal generation section for generating a sub beam push-pull signal; a displacement amount detection section for detecting a displacement amount of the main beam push-pull signal from a reference value based on the main beam push-pull signal and the sub beam push-pull signal; and a tracking error signal generation section for generating a tracking error signal by correcting either the main beam push-pull signal or the sub beam push-pull signal based on the displacement amount.
REFERENCES:
patent: 4787076 (1988-11-01), Deguchi et al.
patent: 5828634 (1998-10-01), Ohno et al.
patent: 2003/0090970 (2003-05-01), Wantanabe et al.
patent: 61-094246 (1986-05-01), None
Kondo Kenji
Kuze Yuuichi
Watanabe Katsuya
Yamada Shin-ichi
Yoshikawa Akira
Bibbins LaTanya
Renner , Otto, Boisselle & Sklar, LLP
Young Wayne
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