| 摘要 |
A lens barrel including a telescopic cylinder accommodated within a fixed cylinder, and lenses retained in the telescopic cylinder. The lens barrel includes lens retaining frames to retain at least one of the lenses and a lens driving device to drive the lens retaining frames so as to drive the lenses along a longitudinal axis of the telescopic cylinder between a collapsed position in which one portion of the lenses is stored in the fixed cylinder and an extended position in which one portion of the lenses is extended out of the fixed cylinder toward a photographing subject. The lens barrel further includes a retractable lens that is retracted into the fixed cylinder through an opening in a wall of the fixed cylinder when the telescopic cylinder is in the extended position, and a retractable tens retaining frame to retain the retractable lens.
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