Optics: motion pictures – Time compression or expansion
Patent
1978-09-22
1982-12-28
Hayes, Monroe H.
Optics: motion pictures
Time compression or expansion
352185, 352216, 352156, G03B 100
Patent
active
043658768
ABSTRACT:
A motion picture camera of the type which advances the film through a film gate in a stop-and-go motion and particularly designed for high speed operation, and comprising a film drive mechanism having a sprocket and two guide assemblies for forming and guiding a loop of film through the film gate, one of the guide assemblies being mounted on an eccentric for continuous rotation while moving the loop of film against a stationary registration pin in intermittent fashion, the registration pin being disposed for insertion through a perforation of the film when the eccentric crosses dead center, and the other guide assembly being a compact structure for cooperating with the first guide assembly to reduce any accumulation of the composite error in the perforations of the film; the camera is also constructed in two sections which are removably secured together by a release mechanism which is readily separable by one hand of the operator of the camera, one section of the camera containing a film supply reel and take-up reel having a self-contained reel spacer interposed therebetween and the film guide apparatus, and the other section of the camera containing power devices and an adjustable shutter arranged for producing a greater shutter time during exposure of each frame of the film, and an appropriate lens system, the film gate including a film channel along the wall of the magazine and being characterized by having a zero clearance construction and remaining in substantially fixed relation to the lens mounting, and the film drive mechanism also being formed to drive through the sprocket and the film and including a novel take-up friction drive in constant engagement with the take-up reel.
REFERENCES:
patent: 1884605 (1932-10-01), Dina
patent: 2614456 (1952-10-01), Zeuthen
patent: 3554635 (1971-01-01), Milliken
patent: 3625406 (1971-12-01), Campbell
patent: 3637298 (1972-01-01), Whitley
patent: 3893757 (1975-07-01), Donnici
patent: 4083516 (1978-04-01), Schuch et al.
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