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G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
FR869737D1941-02-041941-02-04Perfectionnements apportés aux procédés et appareils pour l'enregistrement et la reproduction des films sonores
ExpiredFR869737A
(fr)
Perfectionnements apportés aux appareils à films pour la reproduction des sons, notamment aux appareils pour l'enregistrement et la projection de films parlants