| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the backlash of a lock ring 40. <P>SOLUTION: The lock ring 40 is attached to the outer circumference of an operation ring for moving a movable lens. The lock ring 40 usually has such a force that the lock ring 40 is closed, so that the movable lens is fixed because the operation ring cannot rotate. When a release knob 80 is rotated clockwise by 90 degrees when viewed from a plane, the lock ring 40 is opened and the rotation ring can be rotated. The movable lens can be moved as well. A projection 82 is formed in the release knob 80. When the release knob 80 is rotated clockwise by 90 degrees when viewed from a plane, the projection 82 enters a hole formed in a lens barrel body. The release knob 80 is fixed to the lens barrel body, so that the lock ring 40 is fixed to the lens barrel body as well, to suppress the backlash. <P>COPYRIGHT: (C)2013,JPO&INPIT |
