Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
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.
Fearnside William T.
Orlicki David M.
Eastman Kodak Company
Richardson Robert L.
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