| 摘要 |
PURPOSE:To obtain a lens barrel whose production cost can be reduced by integrating motor-driving members for zooming, and motor-driven component parts for focusing, reducing the cost of parts and simplifying assembly. CONSTITUTION:When power is supplied to the motor 11a for zooming of a motor (u) in order to operate a zoom gear 3c integrally molded with a cam barrel 3 to perform zooming, rotational force is transmitted from an output gear to the zoom gear 3c, and the cam barrel 3 is turned at a fixed position. This rotation range is regulated by a mount 1 and the zoom gear 3c. A rear group lens barrel 9 engaging with the inside cam lift 3b of the cam barrel 3 is fitted in three straight advance grooves 2a of a fixed barrel 2, and held and moved in the optical axis direction so that the projection 9a of the lens barrel 9 may slide without backlash in the cam lift 3b. |
