1981-04-24
1983-01-04
Adams, Russell E.
354 35, 354 60F, 354145, G03B 716
Patent
active
043670237
ABSTRACT:
Camera exposure control circuitry capable of functioning with a dedicated flash device for producing a preliminary flash light of a relatively long controllable duration at a substantially constant intensity prior to the production of primary flash light automatically changes the diaphragm aperture from an initial aperture setting to another aperture setting during preliminary flash light emission. The light received through the diaphragm aperture set during the preliminary flash light emission provides a first signal output to provide an appropriate aperture size for flash photography in response to the measured light conditions. The duration of the preliminary flash light emission is terminated by a second signal from the camera exposure control circuitry when the diaphragm aperture is determined.
The changing of the aperture size can be interrupted when a predetermined relationship exists between a reference signal and the first signal output by a timing signal generated after a lapse of a predetermined time period from the initiation of the change in the diaphragm aperture. The second signal is also transmitted from the camera control circuitry to the flash device when the aforementioned predetermined relationship does not exist.
Additional light receptors receive light from the primary flash light emission through the determined diaphragm aperture to control the amount of primary flash light emission for optimum exposure.
REFERENCES:
patent: 4305647 (1981-12-01), Ishida
Hosomizu Hiroshi
Ishida Tokuji
Adams Russell E.
Minolta Camera Kabushiki Kaisha
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