Servo signal processing apparatus and optical disk apparatus

Details Servo signal processing apparatus and optical disk apparatus Servo signal processing apparatus and optical disk apparatus

1997-10-07

2000-05-02

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 700

Patent

active

060580836

ABSTRACT:
The present invention provides a servo signal processing apparatus and an optical disk apparatus in which no defocusing is caused when a focus error signal is zero.
The servo signal processing apparatus includes:
first photo-detection means for receiving a return beam reflected from a signal recording plane of a disk-shaped recording medium and outputting an electric signal; second photo-detection means for receiving the return beam and outputting an electric signal; signal correction means for correcting one of the electric signals outputted from the first photo-detection means or the second photo-detection means; and signal comparing means for comparing the electric signal outputted via the signal correction means from one of the first photo-detection means and the second photo-detection means, with the electric signal outputted from the other photo-detection means, and outputting a result of the comparison.

REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 5138596 (1992-08-01), Yamada
patent: 5200942 (1993-04-01), Hosobata et al.
patent: 5610883 (1997-03-01), Yanagawa
patent: 5663942 (1997-09-01), Ishibashi et al.
patent: 5715219 (1998-02-01), Takeda et al.

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