Patent ID: 6123467
Filing Date: 2000-09-26
Classification: G03B

Abstract:
A shutter device comprising:a shutter blade;a base plate;a first arm member whose one end portion is rotatably fitted to said shutter blade and whose other end portion is rotatably fitted to said base plate, an engagement between said first arm member and said shutter blade is effected by holes larger than diameters of shafts, providing a predetermined amount of clearance in said engagement; anda second arm member whose one end portion is rotatably fitted to said shutter blade and whose other end portion is rotatably fitted to said base plate, an engagement between said second arm member and said shutter blade is effected by holes larger than diameters of shafts, providing a predetermined amount of clearance in said engagements,wherein a distance between the center of rotation of said first arm member with respect to said shutter blade and the center of rotation of said second arm member with respect to said shutter blade is set to be different from a distance between the center of rotation of said first arm member with respect to said base plate and the center of rotation of said second arm member with respect to said base plate.