SHUTTER IRIS

PROBLEM TO BE SOLVED: To provide an improved shutter iris where a noise is reduced while suppressing a change in shutter speed due to an attitude difference. SOLUTION: The shutter iris 1 mainly includes a stepping motor 10, a plurality of combination blades 80, and a base 60. The motor 10 includes a stator 20 and a rotor 40 rotatably stored in the stator 20. One end of the rotor shaft 43 of the rotor 40 projects to the base 60 so as to functions as a drive part, and an arm 50 with a plurality of protrusively arranged cam pins 55 is fixed to the drive part. When the motor 10 is rotationally driven, the combination blades 80 are slidably driven by the cam pins 55 of the arm 50 so as to open/close an optical path aperture. The end opposite to the drive part of the rotor shaft 43 is energized by a leaf spring 47 toward the drive part, and the end part on the drive part side comes in contact with a projection part 61 formed on the base 60. COPYRIGHT: (C)2007,JPO&INPIT