Optics: motion pictures – Methods
Patent
1974-08-05
1976-02-03
Greiner, Robert P.
Optics: motion pictures
Methods
352 29, G03B 3100
Patent
active
039361667
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: 1097483 (1914-05-01), Triplett
patent: 1943305 (1934-01-01), Foster
patent: 3375054 (1968-03-01), Hughes
patent: 3375055 (1968-03-01), Hughes
patent: 3746438 (1973-07-01), Misawa
patent: 3825327 (1974-07-01), Kosarko et al.
Greiner Robert P.
Mathews Alan
Polaroid Corporation
Thornton David R.
LandOfFree
Multipurpose audio-visual cassette method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multipurpose audio-visual cassette method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multipurpose audio-visual cassette method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2120199