DE2214549

In a shutter control, a photoresistive element whose resistance varies non-linearly with changes in incident light forms part of a voltage divider with a variable resistor. The voltage divider contacts the output of a meter. The resistor, in turn, forms part of an RC circuit that controls the timing...

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Bibliographic Details
Main Authors KONISHI, YUICHIRO, MACHIDA, TOKIO, TAGUCHI, TATSUYA, TOKIO
Format Patent
LanguageEnglish
Published 18.07.1974
Edition2
Subjects
ACCESSORIES THEREFOR
APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:In a shutter control, a photoresistive element whose resistance varies non-linearly with changes in incident light forms part of a voltage divider with a variable resistor. The voltage divider contacts the output of a meter. The resistor, in turn, forms part of an RC circuit that controls the timing of a shutter. Through a movable contact arm, the photoresistive element contacts one of a series of equally spaced tabs that connect to the resistor in a non-linear sequence corresponding to the non-linearity of the photoresistive element. Through a second movable contact arm, the capacitor contacts one of a second series at equally spaced taps that connect to the resistor in a second non-linear sequence. The second sequence corresponds in non-linearity to the non-linearity of a succession of shutter speed adjustments. Adjustments of the shutter speed moves both arms simultaneously so that when the meter reads a predetermined value, the shutter speed corresponds to the light conditions. Adjustment of the film speed marker moves only the second arm.
Bibliography:Application Number: DE19722214549