Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-01-16
1992-05-19
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369107, 369112, G11B 700
Patent
active
051154200
ABSTRACT:
A laser in a magneto optical recorder supplies a laser light beam to be used in processing signals to and from a magneto optical record member. The laser beam is split into two portions. A first portion is the data beam which is directed to impinge upon a magnetooptic storage member. A second portion is so-called wasted light which is directed away from the storage member. The wasted light is intercepted by a mirror and reflected into a beam splitter to phase-coherently combine with light reflected from the storage member for improving signal-to-noise ratio of the reflected storage member light beam. This action improves signal-to-noise ratio and enhances servo operation in the focusing position control of the optical head with respect to an optical storage medium. The focus control signal derived from the reflected light is not only used to control the focus of an objective lens in the system but also for positioning the mirror in synchronism with the movement of the storage member along the axis of the objective lens so that the phase-coherence of the wasted light beam and the data beam is maintained.
REFERENCES:
patent: 3905703 (1975-09-01), Matsumoto
patent: 4409631 (1983-10-01), Matsumoto
patent: 4447722 (1984-05-01), Saimi
patent: 4660187 (1987-04-01), Yoshino et al.
patent: 4725721 (1988-02-01), Nakamura
patent: 4742505 (1988-05-01), Takeuchi et al.
patent: 4823220 (1989-04-01), Milster et al.
Maissel et al, "Handbook of Thin Film Technology", pp. 11-10 through 11-12; McGraw-Hill Book Co., 1970.
Finkelstein Blair I.
McDaniel Terry W.
International Business Machines - Corporation
Richardson Robert L.
Somermeyer H. F.
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