Optics: motion pictures – Removable film strip magazine type – Magazines
Patent
1974-08-05
1976-02-17
Sheer, Richard M.
Optics: motion pictures
Removable film strip magazine type
Magazines
352 14, G03B 2302
Patent
active
039388859
ABSTRACT:
A sound motion-picture system employing a film handling cassette within which the film is retained throughout all photographic and audio operations. The film handling cassette includes both an audio station and an exposure-projection station, and the camera and viewer apparatus includes a pair of drive arrangements for progressively advancing incremental sections of such film across the exposure-projection station and for substantially uniformly advancing the film strip through the audio station. To isolate these different film motions, the drive arrangements cooperate with the cassette to provide a free loop of film extending exteriorly of the cassette. A sensing element monitors the loop of film and adjusts one of the drives so as to retain the loop within predetermined limits. In the camera, the audio drive is coupled to the start switch so as to displace the audio drive into a standby position when the camera is not being operated. Additionally, means are provided for eliminating the loop so as to facilitate removal of the cassette from the apparatus.
REFERENCES:
patent: 3053140 (1962-09-01), Brogan et al.
patent: 3375054 (1968-03-01), Hughes
patent: 3771861 (1973-11-01), Land
patent: 3785726 (1974-01-01), Miller
patent: 3812515 (1974-05-01), Cook
Mathews Alan
Polaroid Corporation
Sheer Richard M.
Thornton David R.
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