Electronic projector

Details Electronic projector Electronic projector

1986-09-30

1987-10-06

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With speed regulation or selection

352182, G03B 2148

Patent

active

046978968

ABSTRACT:
A projector is described, of the type wherein a motor-driven sprocket wheel cyclically pulls a film frame-by-frame through a film gate, by applying a large accelerating voltage at the beginning of each cycle, followed by a decelerating voltage and a fine-positioning sequence, which assures that the film will lie close to the final position and be moving slowly at the beginning of the fine-positioning sequence. A determination is made as to whether the film has moved a predetermined distance by a predetermined time after the beginning of each cycle, and the accelerating voltage for the next cycle may be changed to cause such predetermined movement at that predetermined time for subsequent cycles.

REFERENCES:
patent: 3692394 (1972-09-01), Bauer
patent: 3819258 (1974-06-01), Butler et al.
patent: 4022525 (1977-05-01), Boudouris
patent: 4150886 (1979-04-01), Merkel et al.
patent: 4215921 (1980-08-01), Miller et al.
patent: 4405217 (1983-09-01), Brant

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