| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a lens barrel achieving a smooth zoom operation even when a lens holding frame receives shock. <P>SOLUTION: A lens barrel includes: a lens holding frame 102 including a cam follower pin 103 to hold a lens 101; a guiding barrel 700 for linearly guiding the lens holding frame 102 in an optical axis direction; and a cam cylinder 800 rotating with an optical axis as a center to move the lens holding frame 102 in the optical axis direction. In the cam cylinder 800, a cam groove 800a to which the cam follower pin 103 is engaged is formed, and the cam groove 800a includes a bottom side part 8001 having a tapered angleαand an open side part 8002 having a tapered angleβsmaller than the tapered angleα. When the lens holding frame 102 does not receive shock, the cam follower pin 103 does not abut on the open side part 8002 of the cam groove 800a and abuts on the bottom side part 8001, and when the lens holding frame 102 receives shock, the cam follower pin 103 does not abut on the bottom side part 8001 of the cam groove 800a and abuts on the open side part 8002. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
