Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1989-08-30
1992-03-31
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369103, 359 3, G11B 700
Patent
active
051013975
ABSTRACT:
A method for recording signals on, and reproducing them from, a film for signal recording and reproduction, in which after coherent light is used to produce interference bands of light in accordance with signals, the interference bands of light are recorded on the film. In reproduction, the reproduction light by the coherent light is projected to an interference band section on the film, and diffractive light produced in the interference band section is detected for signal reproduction. That is, the interference bands of light corresponding to signals are recorded and reproduced. Recording and reproduction, therefore, can be effected with high fidelity and high quality without a change in sound characteristics likely to caused by film condition and an optical system.
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Envall Jr. Roy N.
Mitsubishi Denki & Kabushiki Kaisha
Tran Thang V.
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