Acquiring focus in an optical disk system using a time and shape

Details Acquiring focus in an optical disk system using a time and shape Acquiring focus in an optical disk system using a time and shape

1991-09-11

1993-08-03

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4475, 369 4434, 2502015, G11B 709

Patent

active

052335852

ABSTRACT:
The focus acquire system on optical disk recorder as well as other optical systems, signal processes a focus error signal FES to produce a modified FES which has a peak amplitude occurring closer to a desired focus position than the occurrence of peak amplitude of the FES. The modified FES also is signal processed to sharpen or slim the peak portion such that increasing the amplitude of the modified FES reaches an amplitude detection threshold closer to the true peak of the modified FES, and hence closer to the desired focus position than if the amplitude detection threshold were used on the FES. In a preferred form of the invention, FES is differentiated to produce a differentiated FES, then the differentiated FES is subtracted from FES to produce the modified FES.

REFERENCES:
patent: 368526 (1983-01-01), Hariage et al.
patent: 3883689 (1975-05-01), Monsour et al.
patent: 4674076 (1987-06-01), Hsieh et al.
patent: 4705941 (1987-11-01), Yamada et al.
patent: 4733066 (1988-03-01), Konno et al.
patent: 5103439 (1992-04-01), Bierhoff et al.

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