Device for setting exposure time and aperture size on cameras

摘要

A device for setting or controlling shutter exposure time and diaphragm working aperture size on cameras having a lens shutter assembly with a reciprocating shutter sector system for opening and closing the lens passage and a diaphragm segment system which is also suitable for closing the shutter opening of the lens passage, the sector system and the segment system both preferably being independently driven by corresponding electrodynamic drive units selectively controlled by an electronic control circuit incorporating a microcompouter, such that first the diaphragm segments are driven at comparatively low driving energy or speed to define a manually or automatically predetermined size working aperture, then the shutter sectors are moved to open the lens passage for exposing the film, and thereafter the diaphragm segments are again driven but at comparatively high energy or speed, commencing at a selectively timed interval after the movement of the shutter sectors to open position, whereby to close the lens passage.