| 摘要 |
PROBLEM TO BE SOLVED: To prevent deformation in the rotating direction without spoiling energization force of taper rollers to a taper cam by providing guide members preventing the tapered rollers from moving in the direction of rotating around the optical axis. SOLUTION: In a lens barrel having a cam ring provided with a tapered cam, and a movable lens barrel to which tapered rollers following to the tapered cam are fitted through elastic arms 7c, a guide member 15 preventing the tapered rollers from moving in the direction of rotating around the optical axis. Namely, roller seats 7b are integratedly provided on a three group lens barrel 7 through elastic arms 7c, and the guide member 15 is fixed based on a positioner 7d. The sides of the roller seats 7b are guided with the guide parts 15b of the guide member 15, the roller seats 7b are controlled from shaking in the rotating direction against the three group lens barrel 7 through the elastic arms 7c, and they can move only in the radial direction. The three group rollers 12 are fixed to the roller seats 7b through three group roller shafts 14.
|
