| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens barrel with which movable ranges of respective lens groups can be sufficiently secured without enlarging a cam tube even if it is necessary to form a plurality of cam grooves on the same circumferential surface of the same cam. SOLUTION: The zoom lens barrel performs zooming by moving the plurality of lens groups, which constitute a photo-taking optical system, in an optical direction. The zoom lens barrel includes a first lens group of the plurality of lens groups and a second lens group of the plurality of lens groups. The zoom lens barrel also includes the cam that has a first cam region for moving the first lens group in the direction of the optical axis and a second cam region for moving the second lens group in the direction of the optical axis. The cam commonly use overlapping partial regions of the first cam region and the second cam region in performing the zooming. The cam forms a zooming interval between the first lens group and the second lens group by the first cam region and the second cam region. COPYRIGHT: (C)2007,JPO&INPIT
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