Patent
1975-10-03
1977-04-12
Hix, L. T.
354 30, 354 27, 354 60R, 354230, G03B 714
Patent
active
040178730
ABSTRACT:
This invention relates to a photographic apparatus which includes an exposure control system having shutter blade elements with respective selectively shaped aperture openings therethrough which, depending upon the position of the blades, symmetrically overlap over a light entering exposure opening within the camera to define an effective scene light admitting aperture. During an exposure interval, the blades move simultaneously in correspondence with each other to define a progressively variable effective aperture opening over the camera light entering opening. The exposure control system additionally includes exposure control circuitry having a photoresponsive element therein as well as means responsive to the output condition of the photoresponsive element for arresting the shutter blade movement to define a maximum effective size aperture opening as a function of a first select scene light condition during a photographic exposure interval. Means are also provided for thereafter initiating the closure of the shutter blade elements to terminate the exposure interval as a function of a second select scene light condition.
REFERENCES:
patent: 3750543 (1973-08-01), Eloranta et al.
patent: 3927415 (1975-12-01), Petersen
patent: 3942183 (1976-03-01), Whiteside
patent: 3952312 (1976-04-01), Douglas
Muggli Juerg
Shenk Edwin K.
Hix L. T,.
Miska Vit W.
Polaroid Corporation
Roman Edward S.
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