Dynamic information storage or retrieval – Optical reading of mechanical record
Patent
1981-09-24
1985-03-12
Faber, Alan
Dynamic information storage or retrieval
Optical reading of mechanical record
369100, 369 45, G11B 1118
Patent
active
045049343
ABSTRACT:
In an optical signal reproducing apparatus for a conventional disc phonograph record, the groove of said record is irradiated with the light beam from a direction that varies cyclically at a constant frequency in a plane. Said plane includes both the tangential velocity vector of the groove and a normal line to the surface of the groove. At the moment that the light beam irradiates the surface of the groove from a perpendicular direction, the reflected light beam traces back the same path as that of the irradiating light beam. When a photo-detector is limited by a slit to detect only the reflected light beam tracing back the same path as the irradiating light beam, the photo-detector detects light pulses which are pulse-phase-modulated by the slope angle of the surface of the groove. The recorded signal can be reproduced by demodulating said pulse-phase-modulated pulses.
REFERENCES:
patent: 3138669 (1964-06-01), Rabinow
patent: 3798386 (1974-03-01), Dickopp
patent: 3860766 (1975-01-01), Mori
patent: 3932700 (1976-01-01), Snopko
patent: 3992593 (1976-11-01), Heins
patent: 4005259 (1977-01-01), Kaneko
patent: 4037929 (1977-07-01), Bricot
patent: 4163149 (1979-07-01), Sawano
patent: 4193091 (1980-03-01), Kleuters
patent: 4310911 (1982-01-01), Fujishima
"Self-Coupled Optical Pickup" by Mitsuhashi et al., Optics Communications, vol. 17, No. 1, Apr. 1976.
Hirose Namio
Kobayashi Kazutsugu
Matsuda Ikuo
Tanaka Shin-ichi
Faber Alan
Matsushita Electric - Industrial Co., Ltd.
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