| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform stable barrier opening and closing operation, without enlargement of a lens barrel in the diametric direction, by providing an inflection point on a barrier drive spring and making the force of the barrier drive spring work in the turning direction of barrier vanes. <P>SOLUTION: A barrier device has a barrier drive member 5 that is turned around an optical axis between an open state and a closed state by shifting a lens barrel between a shooting state and a standby state, and barrier vanes 7 that are engaged with elastic members 6 engaged with the barrier drive member 5 and are opened and closed by the elastic forces of the elastic members 6 as the barrier drive member 5 turns. Each of the elastic members 6 has an inflection point at least on a turning face of the barrier drive member 5 in a direction different from the pressing direction the elastic member 6 itself has. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
