Focus/tracking servo automatic gain control for optical recordin

Details Focus/tracking servo automatic gain control for optical recordin Focus/tracking servo automatic gain control for optical recordin

1988-12-05

1990-10-30

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

049674048

ABSTRACT:
In an optical recording system, automatic gain control circuitry is provided to maintain the gain of the focus (or tracking) servo system substantially constant and independent of intensity variations in the light beam used to detect focus (or tracking) error. According to a preferred embodiment, such circuitry comprises two cascaded stages, i.e., a switchable gain first stage for effecting coarse gain changes on command (e.g. when switching between write and read modes), and a non-linear feedback second stage for adjusting the coarsely trimmed output of the first stage to achieve overall constant focus (or tracking) error gain.

REFERENCES:
patent: 4471477 (1984-09-01), Bierhoff
patent: 4751695 (1988-06-01), Kaku et al.

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