Fade-over apparatus for a motion picture camera

Details Fade-over apparatus for a motion picture camera Fade-over apparatus for a motion picture camera

1975-07-23

1977-02-08

Adams, Jr., Russell E.

Optics: motion pictures

Special effects

Transition effects

352915, 354 23D, G03B 2136

Patent

active

040069753

ABSTRACT:
Pressing of the camera release button causes start of the film transport and automatic setting of the diaphragm for a normal exposure. When fade-over switch is closed, a forward-reverse counter is started. When the count on the counter reaches 31, a first AND-gate switches a first JK flip-flop to a second state wherein an additional resistor is inserted in the normally balanced diaphragm control circuit thereby unbalancing same and causing the closing of the diaphragm to commence. When the count on the counter reaches 63, another AND-gate switches additional JK flip-flops for reversing both the film transport and the counting direction of the counter. When the counter has counted down to a predetermined number, further logic circuits cause a stoppage of the film transport and stopping and resetting of the counter so that reactivation of the release button automatically starts the fade-in.

REFERENCES:
patent: 3701594 (1972-10-01), Keiner
patent: 3712721 (1973-01-01), Keiner et al.

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