Patent ID: 8947586
Filing Date: 2015-02-03
Classification: H04N

Abstract:
1. A diaphragm control apparatus of an interchangeable lens camera, comprising: a photographing lens provided with an adjustable diaphragm device, in which an aperture is changeable between a maximum aperture and a minimum aperture; a camera body to which said photographing lens is detachably attached, said camera body being provided with a stepping motor for driving said diaphragm device to change between said maximum aperture and said minimum aperture when said photographing lens is attached to said camera body; a diaphragm control slider provided in said camera body, wherein said diaphragm control slider is driven by said stepping motor between a first control end that corresponds to said maximum aperture of said diaphragm device and a second control end that corresponds to said minimum aperture of said diaphragm device; a position detector provided in said camera body, wherein said position detector detects the position of said diaphragm control slider; an input device, into which an initialization-process command signal is input, wherein said initialization-process command signal commands an initialization process to commence in the camera body; and a controller which, upon said initialization-process command signal being input to said input device, drives said diaphragm control slider toward said first control end at high-speed in a stepwise manner via said stepping motor, stores in a memory, as a temporary origin, a position detected by said position detector to which the diaphragm control slider has rebounded after reaching said first control end, and after said diaphragm control slider has rebounded, said controller compares a current position of said diaphragm control slider, detected by said position detector, with said temporary origin while activating the stepping motor to move said diaphragm control slider at a low-speed towards said first control end, wherein, when said current position of said diaphragm control slider, detected by said position detector, is within a predetermined range of said temporary origin, said controller determines said current position as the origin of said diaphragm control slider.