Optics: motion pictures – Optical rectifier type
Patent
1997-05-27
2000-01-11
Lee, Eddie C.
Optics: motion pictures
Optical rectifier type
352109, 352113, 352120, 352187, G03B 4102, G03B 4110, G03B 124
Patent
active
060141980
ABSTRACT:
The invention refers to a method of shortening the closure time of shutters in cinema projectors of the type in which film is intermittently advanced one frame at a time into registry with an image window in the projector, and wherein each time the film is advanced a shutter in the projector closes the image window during the time that the film is being advanced. According to the invention, an optical compensation of the film motion is effected by determining the rate at which each image of the film begins and ends, respectively, its advance into registry with the image window of the projector, generating a control signal proportionate to the rate, and positioning between the image window and the associated projection screen a movable plane-parallel plate which is adjsuted by the control signal to shorten the closure time of the image window during each film advance, thereby to increase the luminous efficiency factor of the projector.
REFERENCES:
patent: 2868066 (1959-01-01), Argyle
patent: 2952183 (1960-09-01), Warrick
patent: 3752568 (1973-08-01), Perreau
patent: 3753612 (1973-08-01), Okey et al.
patent: 3937378 (1976-02-01), Kopernicky
patent: 3968506 (1976-07-01), Lancor, Jr. et al.
patent: 5096288 (1992-03-01), Yano et al.
Lee Eddie C.
Raytheon Anschutz G.m.b.H.
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