Shutter control system having information circuit for introducin

Details Shutter control system having information circuit for introducin Shutter control system having information circuit for introducin

1979-07-23

1981-12-29

Hix, L. T.

354 60L, G03B 7083, G03B 716, G03B 1718

Patent

active

043079490

ABSTRACT:
In a program shutter of the type in which the aperture opening gradually increases with the lapse of time, informations such as sensitivity of the film and the object distance are introduced by an electric circuit.
The system has a switching circuit for exposure control. The trigger level of the switching circuit is determined in proportion to the film sensitivity and the object distance to vary the exposure control time corresponding to the informations to automatically determine a proper aperture for flash photography.
The system is capable of providing a warning indication prior to the shutter operation if the exposure control time thus obtained is longer than the time during which the aperture is fully opened.

REFERENCES:
patent: 3504604 (1970-04-01), Kitai
patent: 3668987 (1972-06-01), Hayashi
patent: 3696721 (1972-10-01), Wagner
patent: 3824606 (1974-07-01), Yoshimura
patent: 3921184 (1975-11-01), Borowski
patent: 3987464 (1976-10-01), Kitai et al.
patent: 4033682 (1977-07-01), Nakamura et al.

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