Exposure control device for photographic cameras

Details Exposure control device for photographic cameras Exposure control device for photographic cameras

1976-07-01

1977-10-18

Adams, Russell E.

354 23D, 354 37, 354 38, 354 43, G03B 708

Patent

active

040548872

ABSTRACT:
Exposure control device for a photographic camera wherein, in a part of the exposure control device, electronic means are provided in order to form, from the luminous density of an object, the film sensitivity, and the preselected time, a voltage analogous to a diaphragm setting, and wherein a storage means is provided for storing this value, the improvement comprising the combination of the following features:
A. when the camera release is actuated, the diaphragm begins to operate from an initial position corresponding to the maximum diaphragm opening, a diaphragm path meter coupled therewith operating simultaneously with this diaphragm and yielding a value corresponding to the change in aperture;
B. means are provided which compare the value produced by the diaphragm path meter with the stored value and, in case of identical values, or compensation of the values, stop the operation of the diaphragm by a stop member;
C. furthermore, means are provided which add the remaining difference value between the formed value and the value formed by the diaphragm path meter to the value corresponding to the preselected time; and
D. the open time of the shutter is formed by conventional electronic means in correspondence with the value delivered by the time setter, taking the difference value into account.

REFERENCES:
patent: 3466447 (1969-09-01), Fahlenberg
patent: 3554104 (1971-01-01), Winkler et al.
patent: 3695158 (1972-10-01), Fahlenberg
patent: 3721167 (1973-03-01), Ogiso
patent: 3798662 (1974-03-01), Suzuki
patent: 3863263 (1975-01-01), Itagaki
patent: 3909137 (1975-09-01), Kisanuki
patent: 3964073 (1976-06-01), Kobori et al.
patent: 4006484 (1977-02-01), Nobusawa

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