| 摘要 |
The lens barrel includes a second group frame forwardly/backwardly movable, which is provided with plural pairs of cam followers, a first cam unit as a rotatable frame member that allows switching of engagement with the cam follower, and includes plural pairs of cam grooves and loose fit grooves, and a cam frame that allows switching of engagement with the cam follower, and includes a second cam unit formed of plural pairs of cam grooves and loose fit grooves. The cam frame rotational phase where the first cam unit switches engagement with the cam follower is different from the cam frame rotational phase where the second cam unit switches engagement with the cam follower. This makes it possible to increase a forward/backward movement of the second group frame and reduces fluctuation of resistance against the drive load, thus preventing the image blur.
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