| 摘要 |
A lens barrel comprises a first frame and a second frame. A first female helicoid is formed in the first region on the inner circumference face of the first frame, and a second female helicoid is formed in the second region on the inner circumference face thereof with the same lead and a different groove depth from that of the first female helicoid. The second frame is disposed inside of the first frame, and a first male helicoid for spirally meshing with the first female helicoid, and a second male helicoid for spirally meshing with the second female helicoid, are formed on the outer circumference thereof. The second frame is relatively rotated with respect to the first frame so that the second frame is linearly moved.
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