Motion-picture camera with diaphragm control system having fadeo

Details Motion-picture camera with diaphragm control system having fadeo Motion-picture camera with diaphragm control system having fadeo

1977-08-25

1978-08-15

Adams, Russell E.

Optics: motion pictures

Special effects

Transition effects

352 91S, 352141, 354 23D, G03B 2136

Patent

active

041068645

ABSTRACT:
The user selects a fadeover duration by selecting the number of pulses in a reference pulse packet registered by a reference counter. During film transport in either direction, a frame-pulse counter counts up a number of frame pulses equal to the number of pulses in the reference pulse packet, and then performs another frame-pulse counting cycle. Each frame-pulse counting cycle advances a program-step counter. Logic circuitry is responsive to the count on the program-step counter and, during the successive program steps, causes fade-out, film-rewind, and fade-in operations to be performed. The adjusting motor for the diaphragm operates at a speed inversely related to the number of pulses in the reference pulse packet, and the amount by which the adjusting motor changes the diaphragm setting during each frame-pulse counting cycle is always the same.

REFERENCES:
patent: 4006975 (1977-02-01), Wagersonner et al.

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