| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens barrel capable of distributing, upon receipt of an impact of, e.g., dropping, a load so as not to concentrate torque on a specific linear movement key and a groove for linearly moving a barrel member, thereby suppressing occurrence of a failure. <P>SOLUTION: A lens barrel comprises: a fixed barrel 8 having linear movement grooves 8c, 8d and a groove part 8e; a cam cylinder 6 in which a cam groove 6c is formed and which moves rotatingly in an optical direction; and a third lens group barrel 3 which can move in the optical direction relative to the fixed barrel 8. The third lens group barrel 3 includes a cam pin 3a engaging with the cam groove 6c, a linear movement key 3c engaging with the linear movement groove 8c, a linear movement key 3d engaging with the linear movement groove 8d, and a projection 3e engaging with the groove part 8e. In a movement region of the third lens group barrel 3 moving in the optical direction relative to the fixed barrel 8, the lens barrel has a mutually engageable region and a mutually disengageable region with a set of the linear movement groove 8c and the linear movement key 3c and a set of the linear movement groove 8d and the linear movement key 3d, and does not have a mutually engageable region with a set of the groove part 8e and the projection 3e. <P>COPYRIGHT: (C)2012,JPO&INPIT |
