Information recording and/or reproducing apparatus and method fo

Details Information recording and/or reproducing apparatus and method fo Information recording and/or reproducing apparatus and method fo

1994-02-14

1996-09-24

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4429, 369 4425, G11B 700

Patent

active

055597726

ABSTRACT:
An information recording and/or reproducing apparatus has an auto gain controller for controlling the amplitude level of a reproduction signal read out from a recording medium to a predetermined level. The auto gain controller has a variable gain amplifier for amplifying the reproduction signal, a converter for converting the output of the variable gain amplifier into a DC voltage, and a comparator for comparing the output from the converter with a predetermined reference value and sending the result of the comparison to the variable gain amplifier. The controller also includes a fixing device for fixing the gain of the variable gain amplifier, and a focusing offset for applying an adjuster offset to a focusing servo loop when the gain is fixed by the fixing device, and introducing the output of the converter thereinto while varying the amount of the applied offset, thereby effecting the adjustment of the focusing offset.

REFERENCES:
patent: 4340950 (1982-07-01), Kosaka
patent: 4730294 (1988-03-01), Funada
patent: 4899327 (1990-02-01), Bates et al.
patent: 5164932 (1992-11-01), Fennema et al.

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