Patent ID: 6747703
Filing Date: 2004-06-08
Classification: G03B,H04N

Abstract:
A diaphragm device for a digital camera having an optical image input system including a photographing element for converting an optical image input by an optical system to electric signals and a signal processor for applying predetermined signal processing to the electric signals obtained by the photographing element, the diaphragm device adjusting an exposure time by controlling incident luminous flux to the photographing element and an electric charge storage time of the photographing element and comprising:a diaphragm sheet rotatably arranged around a rotation central shaft set in parallel with a photographing optical axis of the optical system and having a plurality of diaphragm apertures having different diameters arranged in a turret shape on a reference circle around the rotation central shaft; a rotary ring arranged rotatably in forward and reverse directions around the photographing optical axis; a click member retained by the rotary ring rotatably only in one direction so as to rotate the diaphragm sheet in the one direction; a rotation driving device driving the rotary ring to rotate; and a positioning mechanism fastening the diaphragm sheet in a position setting a selected diaphragm aperture.