| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens barrel obtaining efficient assembly work in a simple composition. <P>SOLUTION: The lens barrel includes: a first frame member 19 having a first cam follower 19b and retreating in the optical axis direction O; a second frame member 18 having a second cam follower 18b with a narrower diameter than the first cam follower and retreating in the optical axis direction; a first cam groove 13h engaging with the first cam follower for driving the first frame member in the optical axis direction, a second cam groove 13g engaging with the second cam follower for driving the second frame member in the optical axis direction; an open end 13x opened on the end surface for respectively guiding the first and second cam followers into the first and second cam grooves; and a cam member 13 including a first branching point P1 continuously connected from the open end and branching to one end of the first cam groove and a second branching point P 2 continuously connected from the first branching point and branching to one end of the second cam groove, and a cam follower groove 13i with the first and second cam followers able to pass between the open end and the first branching point but with only the first cam follower able to pass from the first branching point to the second branching point. <P>COPYRIGHT: (C)2012,JPO&INPIT |
