| 摘要 |
The zoom lens barrel has at least front and rear lens groups and a linear movement guide which guides the linear movement of the front and rear lens groups in an optical axis direction. It includes a rotatable cam ring which has a first helicoid and at least one cam groove. A front lens barrels supports the front lens group and has a second helicoid which is engaged by the first helicoid of the cam ring, and a rear lens frame this supports the rear lens group and has at least one cam pin which can be fitted in the associated cam groove of the cam ring.
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