초록 ▼

An exposure control device is disclosed a preferred form of which includes a shutter which is openable to permit scene light to pass through a camera aperture, an electronic circuit for producing a signal which varies with the level of scene illumination, and piezoelectric devices such as bimorphs f

An exposure control device is disclosed a preferred form of which includes a shutter which is openable to permit scene light to pass through a camera aperture, an electronic circuit for producing a signal which varies with the level of scene illumination, and piezoelectric devices such as bimorphs for providing electrical energy to the circuit when mechanically actuated and for controlling the condition of the shutter in response to the signal from the electronic circuit to automatically establish the exposure period.

대표청구항 ▼

For use in photographic apparatus of the type having means for imagewise exposing a photosensitive material, apparatus for controlling the exposure of such material, said apparatus comprising: (a) a photoelectric exposure control circuit for controlling the exposure of a photosensitive material in a

For use in photographic apparatus of the type having means for imagewise exposing a photosensitive material, apparatus for controlling the exposure of such material, said apparatus comprising: (a) a photoelectric exposure control circuit for controlling the exposure of a photosensitive material in accordance with ambient lighting conditions, said circuit comprising a piezoelectric motor for storing electrical energy and a photocell, positioned to be illuminated by ambient light, for dissipating energy stored by said piezoelectric motor at a rate determined by the ambient light level, said rate controlling the exposure of the photosensitive material; and (b) a piezoelectric generator for energizing said circuit.