Fade in and fade out arrangement for a motion picture camera

Details Fade in and fade out arrangement for a motion picture camera Fade in and fade out arrangement for a motion picture camera

1975-07-24

1978-04-11

Hayes, Monroe H.

Optics: motion pictures

Special effects

Transition effects

352141, 354 38, G03B 2136

Patent

active

040836304

ABSTRACT:
The disclosure relates to a fade circuit for a motion picture camera of the type which includes an automatic exposure control. The fade circuit includes a light emitting diode which illuminates the light sensitive device of the automatic exposure control to augment the ambient light levels normally received by the light sensitive device. The intensity of the light emitted by the light emitting diode is controlled by a variable current source which provides the light emitting diode with continuously increasing or decreasing current for increasing or decreasing the intensity of the light from the light emitting diode. Fade-in is obtained as the light intensity of the light emitting diode is gradually decreased from an initial intensity sufficient to close the diaphragm opening to zero intensity to allow the diaphram to assume an opened condition corresponding to ambient light levels. Fade-out is obtained as the light intensity of the light emitting diode is gradually increased from an initial zero intensity which causes the diaphragm to be in an open condition corresponding to ambient light levels to an intensity sufficient to close the diaphragm opening.

REFERENCES:
patent: 3197783 (1965-07-01), Ahn
patent: 3517990 (1970-06-01), McGillion
patent: 3649109 (1972-03-01), Isono
patent: 3696720 (1972-10-01), Vinson
patent: 3701594 (1972-10-01), Keiner
patent: 3950083 (1976-04-01), Yoshimura

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