| 摘要 |
A zoom lens barrel is provided including a cam ring which is threadedly engaged to a female helicoid formed in a stationary barrel, a linear movement guide member that is rotatable relative to the cam ring and movable in an optical axis direction together with the cam ring, and movable lens groups, including first, second and third lens groups that are guided in the optical axis direction by the linear movement guide member. The zoom lens barrel further includes a cut-away portion formed at one end of a linear movement guide groove and inclined at an angle identical to the helicoids between the cam ring and the annular member.
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