G - Physics – 03 – C
Patent
G - Physics
03
C
326/1.4, 352/32.
G03C 11/00 (2006.01) G03D 15/00 (2006.01) G03B 31/02 (2006.01)
Patent
CA 1282170
ABSTRACT The present invention provides for a system and a method for applying a sound track to cinematic film by means of a modulated laser beam. The method of writing sound track information on processed cinematic film having an emulsion layer on a substrate comprises the following steps. First, a laser is directed to apply to the emulsion a light beam of sufficient frequency, intensity, area and duration in order to vaporize at least a portion of the emulsion without damaging the substrate. Second, the light beam is passed through a mask which has a variable area for light transmission. Finally, the light transmission area of the mask is varied by means of an audio-frequency electric signal to generate an audio-sound track on the film with this sound track being readable by cinematic film projection equipment.
532119
Guez Moshe
Swabey Ogilvy Renault
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