| 摘要 |
A lens barrel apparatus according to the present invention incorporates a cam cylinder serving as a lens barrel having cam grooves for moving frame. Spring portions serving as spring means for making predetermined holding force are formed adjacent to the cam grooves to cause the cam grooves to pinch the cam followers. The cam grooves are continuous grooves or openings formed in the surface adjacent to the cam cylinder. The spring portions are constituted by a plurality of openings formed adjacent to the cam grooves. The lens barrel apparatus exhibiting a simple structure having the small number of elements can be operated by a structure constituted by a cam and a cam follower free from any looseness.
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