Patent
Photographic copying arrangement with automatic diaphragm control
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TLDR
In this paper, a first and second diaphragm blades are coupled by gearing in such a way that the first solenoid rotates in a direction opposite to the second one.Abstract:
A first and second diaphragm blade respectively are coupled to a first and second solenoid. The solenoids are intercoupled by gearing in such a manner that the first solenoid rotates in a direction opposite to the second solenoid. One solenoid is activated for closing the diaphragm, one for opening the diaphragm. The signals activating each solenoid are derived from a differential amplifier which compares a signal furnished by a photosensitive element to a reference signal signifying the desired exposure.read more
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Patent
Light mixing apparatus and photographic enlarger embodying same
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Automatic exposure control circuit for a camera
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Tadashi Okano,Kunika Hashimoto +1 more
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Automatic exposure device in camera for microfilm
TL;DR: In this paper, the authors proposed a photometry method to detect the overall density of the original image, which permits exposure of a microfilm with an amount of light which makes the lightest portion of the microfilmed images constant in density.
References
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Patent
Automatic illumination control for photographic printing apparatus
TL;DR: In this paper, a photocell detects the light from the reference light source and effectively compares it with a reference potential to control the opening of a diaphragm in the printing lens to maintain a constant illumination per unit area on the print plane.