| 摘要 |
A lens barrel cam mechanism having a linearly movable member for holding an optical element and which includes a cam follower and a rotary member rotatable relative to the linearly movable member and which has a cam groove with which the cam follower is slidably engaged formed on its circumferential surface, wherein the rotary member is rotated to guide the cam follower so that the linearly movable member is moved forward and backward in the optical axis direction includes a gear portion, the gear portion being developed at the outside of a radius direction and having teeth on its outer periphery and a cam groove opening portion, wherein the cam groove opening portion and the gear portion are provided such that they become substantially coincident with each other on the same vertical plane vertical to the optical axis direction.
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