| 摘要 |
PURPOSE:To prevent a deformation of a lens barrel and a variation of a groove width, caused by cut-opening of a groove end by providing a notch escape part communicating with a slide groove, on one end part of a cylinder surface on which a slide groove engaged with a slide projection is formed. CONSTITUTION:The second rotary cylinder 9 is made eccentric and inserted into the first rotary cylinder 16, and when the top part of a slide projection 15 provided as one body on the cylinder 9 passes through a notch escape part 16c provided on the incide circumference of the cylinder 16, the projection 15 is engaged with a slide groove 16a of the cylinder 16. If a lens barrel is formed in a state that the groove end is cut-opened, instead of such a constitution, a motion between the slide projection and the groove becomes hard due to a deformation of the lens barrel and a variation of a groove width, or a gas is generated, and it is feared that an unsmooth lens motion, an out-of-focus, etc. are caused. |
