| 摘要 |
A retractable lens barrel includes a rear holder which holds a first optical element, and is movable along the axis thereof between an operational retracted positions; an annular member movable relative to the rear holder without rotation; a retractable holder holding a second optical element, and movable between an aligned position where the second optical element is aligned with the axis and a displaced position where the second optical element is displaced relative to the axis; a position control device controlling the annular member and retractable holder to move between an operational position at the aligned position and a retracted position at the displaced position. The rear holder and the retractable holder having contact surfaces which contact each other only if movement of the annular member and retractable holder to the retracted position occurs and the rear holder has not fully moved to the retracted position.
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