Photographic flash device operatively responsive to the luminanc

Details Photographic flash device operatively responsive to the luminanc Photographic flash device operatively responsive to the luminanc

1981-06-23

1983-07-19

Gellner, Michael L.

354 35, G03B 1503

Patent

active

043940790

ABSTRACT:
A photographic flash control device for enabling the firing of a flash light when the luminance level of an object to be photographed is less than a predetermined level and for inhibiting the firing of the flash light when the luminance of an object to be photographed is brighter than a predetermined level. A DC-DC converter generates an oscillating signal for charging a main discharge capacitor. A photoconductive device inhibits the generation of the oscillating DC signal when the luminance level of the object to be photographed exceeds a predetermined level. If the main discharge capacitor is charged to a predetermined firing level, firing of the flash light by a triggering circuit will be inhibited if a sudden change in illumination causes the luminance of the object to be photographed to exceed the level where a flash light is necessary.

REFERENCES:
patent: 3855601 (1974-12-01), Uchiyama et al.
patent: 3953864 (1976-04-01), Iwata et al.
patent: 3978496 (1976-08-01), Matsumoto
patent: 4086582 (1978-04-01), Kiyohara et al.

Affiliated with

Also associated with

Rating

Photographic flash device operatively responsive to the luminanc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photographic flash device operatively responsive to the luminanc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photographic flash device operatively responsive to the luminanc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-748964