Patent ID: 6767146
Filing Date: 2004-07-27
Classification: G03B

Abstract:
An aperture mechanism comprising:aperture blades; a holding frame which holds the aperture blades; and a drive mechanism which opens and closes the aperture blades, the drive mechanism being fitted to the holding frame, wherein the holding frame is adapted to receive a desired one of an electrical drive mechanism which opens and closes the aperture blades electrically and a manual drive mechanism which opens and closes the aperture blades manually as the drive mechanism; wherein: a holding portion which holds the drive mechanism is formed on the holding frame; pin engaging portions which engage with drive pins of the drive mechanism and open and close the aperture blades by shifting of the drive pins are arranged on a face other than a holding face of the holding portion where the drive mechanism is held; a first hole through which a drive shaft of an iris meter for driving the drive pins in the electrical drive mechanism are inserted are provided in the holding face; and a second hole through which the drive pins in the manual drive mechanism are inserted are provided in the holding face.