| 摘要 |
PROBLEM TO BE SOLVED: To prevent a zooming function from being damaged even when external force such as shock is applied to a mirror barrel. SOLUTION: A collar part is formed on a moving cam ring to be engaged with a cam groove formed in an inner diameter of a fixed cylinder and a receiving part allowed to abut on the collar part of the moving cam ring is formed on the fixed cylinder. Thereby even when external force such as shock is applied to the mirror barrel, the external force is received by the receiving part and the moving cam ring is prevented from being dropped from a cam ring of the fixed cylinder. COPYRIGHT: (C)2005,JPO&NCIPI
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