Patent
1976-12-20
1979-03-06
Hix, L. T.
354 43, 354 47, 354152, G03B 708, G03B 1912
Patent
active
041427874
ABSTRACT:
A mechanism for automatically controlling the diaphragm aperture of a single lens reflex camera in response to scene brightness, has a photo-electric element disposed within camera body outside the photographic light path to receive light coming from the scene through the objective and diaphragm aperture and reflected from light reflective surfaces of shutter curtain and/or film. After the reflex mirror has retracted from its viewing position, the diaphragm is gradually stopped down with the photo-electric element receiving scene light therethrough until a diaphragm control circuit detects a suitable diaphragm aperture and interrupts the stopping down operation. Exposure time may be controlled by an electric circuit in accordance with the output of the photoelectric element receiving scene light through the diaphragm aperture adjusted by the diaphragm control circuit.
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Ueda Hiroshi
Yoshizaki Akira
Hix L. T,.
Minolta Camera Kabushiki Kaisha
Perkey William B.
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