Signal playback system transducer with optical resonance cavity

Details Signal playback system transducer with optical resonance cavity Signal playback system transducer with optical resonance cavity

1973-09-10

1976-03-02

Hecker, Stuart N.

Telegraphy

Systems

Printing

178 66DD, 17910041L, 340173LS, G11B 1116

Patent

active

039419452

ABSTRACT:
A pickup system for playing back signals stored on the surface of a carrier in a form providing an optically detectable property which varies as a function of the time pattern of the stored signals, the storage being constituted by undulations or variations in the reflectivity of the carrier surface and the pickup system employing a laser beam which is reflected in a manner controlled by the stored information. The system includes a laser radiation generating element forming part of an optical resonator which also includes the carrier surface so that the intensity of radiation oscillations in the resonator is influenced by the surface and varies as the carrier moves relative to the laser element. The system also includes an output member for converting such intensity variations into an electrical signal representative of the stored signals.

REFERENCES:
patent: 2654810 (1953-10-01), Miessner
patent: 3235672 (1965-02-01), Beguin
patent: 3248670 (1966-04-01), Dill et al.
patent: 3290539 (1966-12-01), LaMorte
patent: 3304430 (1967-02-01), Biard et al.
patent: 3319068 (1967-05-01), Beale et al.
patent: 3353051 (1967-11-01), Barrett et al.
patent: 3431513 (1969-03-01), Nannichi
patent: 3644740 (1972-02-01), Dobratz et al.
patent: 3691317 (1972-09-01), Dickopp
patent: 3691318 (1972-09-01), Schuller et al.
patent: 3702465 (1972-11-01), Cricchi
patent: 3781550 (1973-12-01), Zeidler
patent: 3812477 (1974-05-01), Wieder

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