Optical disc apparatus having improved read accuracy with non-li

Details Optical disc apparatus having improved read accuracy with non-li Optical disc apparatus having improved read accuracy with non-li

1993-08-18

1995-04-11

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4434, G11B 7085

Patent

active

054065364

ABSTRACT:
A head signal process circuit 18 generates a focus error signal representing the distance between an optical disc 11 and an objective lens 20 using a detection signal detected by an optical detector of an optical head 14. The focus error signal is sent to a non-linear amplifying circuit 21. The level of the focus error signal in the vicinity of a servo point is amplified. The level of the focus error signal apart from the servo point is suppressed. The output of the non-linear amplifying circuit 21 is sent to an A/D converter 22. Thus, a servo digital signal is generated.

REFERENCES:
patent: 4876679 (1989-10-01), Mukai
patent: 4975895 (1990-12-01), Yanagi
patent: 5146443 (1992-09-01), Iwase et al.
patent: 5202871 (1993-04-01), Yokota
patent: 5257252 (1993-10-01), Barnes et al.

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