| 摘要 |
A collapsible lens barrel includes a first holding frame ( 2 ) for holding a first lens group (L 1 ), a second holding frame ( 5 ) for holding a second lens group (L 2 ) that is disposed on an image plane side with respect to the first lens group (L 1 ), an actuator ( 6 ) for moving the second holding frame 5 in an optical axis direction, and a tubular cam frame ( 17 ) including a plurality of cam grooves that are formed at substantially equal intervals around a circumferential direction for moving the first holding frame ( 2 ) in the optical axis direction. The actuator ( 6 ) is attached to a portion in the cam frame ( 17 ) where the cam grooves are not formed. The first lens group (L 1 ) is moved using the cam grooves, and the second lens group (L 2 ) is moved using the actuator ( 6 ), so that a faster zooming speed and a lower zooming noise can be achieved.
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