Optics: motion pictures – Removable film strip magazine type
Patent
1987-12-17
1989-02-21
Adams, Russell E.
Optics: motion pictures
Removable film strip magazine type
352141, 358228, G03B 7095
Patent
active
048069647
ABSTRACT:
A method of controlling diaphragm driving in an electronic still camera, wherein a diaphragm is controlled such that an exposure value of a subject on an image forming screen can become a proper exposure value, and a device therefore. In this control of diaphragm driving, the photometric values obtained from every times of photometry are determined to be higher or lower than the proper exposure value. When the photometric values are determined to be higher than the proper exposure value continuously given times, the diaphragm is closed until the photometric values are determined to be lower than the proper exposure value. When the photometric values are determined to be lower than the proper exposure value continuously the given times, the diaphragm is opened until the photometric values are determined to be higher than the proper exposure value.
REFERENCES:
patent: 3813680 (1974-05-01), Wagensonner et al.
patent: 4558368 (1985-12-01), Aoki et al.
patent: 4649431 (1987-03-01), Terashi
patent: 4684995 (1987-08-01), Baumeister
patent: 4714966 (1987-12-01), Saito et al.
patent: 4739411 (1988-04-01), Bolton
Horio Motohiko
Sato Kiyotaka
Tamada Kazukiyo
Adams Russell E.
Fuji Photo Film Co. , Ltd.
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