| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problem: stability of operation of a blade member has a risk of being lowered due to bias of overlapped components installed between a diaphragm cam plate and a diaphragm turn-plate at a circumferential position.SOLUTION: A diaphragm concurrently used shutter includes: a first member for rotationally supporting a shutter blade and a diaphragm blade, and the shutter blade and the diaphragm blade; and a second member having a cam groove for shutter blade for causing the shutter blade to be oscillated, and the cam groove for diaphragm blade for oscillating the diaphragm blade. The shutter blade and the diaphragm blade are arranged at a position sandwiching and facing the second member. The diaphragm concurrently used shutter has a center opening throttled by the diaphragm blade that is shielded by the shutter blade and totally closed by a relative turn-operation performed by the first member and the second member.SELECTED DRAWING: Figure 2 |
