G - Physics – 03 – B
Patent
G - Physics
03
B
204/99
G03B 9/00 (2006.01) G03B 7/081 (2006.01) G03B 7/16 (2006.01)
Patent
CA 1075520
ABSTRACT OF THE DISCLOSURE 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 cir- cuitry 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.
262443
Muggli Juerg
Shenk Edwin K.
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