Camera indicating device with diaphragm control

Details Camera indicating device with diaphragm control Camera indicating device with diaphragm control

1974-09-10

1976-04-13

Hix, L. T.

354 43, 354 53, 354 60L, 354273, G03B 708, G03B 907, G03B 1720

Patent

active

039507670

ABSTRACT:
An indicating device for producing a warning indication of possible over or under exposures in an automatic exposure adjusting device in a photographic camera. The brightness of light rays from a photographic object which are transmitted through a diaphragm aperture, is measured for a duration in which a diaphragm is stopped down from its fully open position to a diaphragm aperture preset by a diaphragm presetting ring. When light measuring output reaches a proper level with respect to a film speed of a film used and a pre-selected shutter speed, a diaphragm control circuit is actuated so as to set the aperture size of the diaphragm. The indicating device provides an indication as to whether or not a proper diaphragm aperture may be obtained during the diaphragm-stopping-down operation so as to effect a proper exposure. A signal commensurate with the difference between a fully open diaphragm aperture and a preset diaphragm aperture is transmitted to a detecting circuit, to which is also supplied the light measuring output at a fully open diaphragm aperture, a film speed and a shutter speed, prior to commencement of the diaphragm-stopping-down operation. The output from the detecting circuit in turn actuates a warning circuit for providing the indication as to whether or not a proper diaphragm aperture is obtained.

REFERENCES:
patent: 3212418 (1965-10-01), Kuppenbender et al.
patent: 3704656 (1972-12-01), Ogiso et al.
patent: 3738237 (1973-06-01), Uchiyama et al.
patent: 3747487 (1973-07-01), Tanikoshi et al.
patent: 3777637 (1973-12-01), Kuramoto et al.

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