| 摘要 |
PROBLEM TO BE SOLVED: To reduce thickness in retraction while increasing an amount of transfer in the light axis direction in a lens barrel. SOLUTION: The lens barrel has: a cam cylinder 30 with an annular groove 37 and cam grooves 35, 36 which cause cam actions in the light axis direction L by rotation on the inner peripheral surface 30b; lens frames 41, 51 arranged inside the cam cylinder 30 and having follower pins engaged into the cam grooves; and a guide cylinder 70 with an engagement piece 73 engaged into the annular groove 37 to regulate transfer in the light axis direction L and guide grooves 71, 72 which guide the follower pints 42, 52 in the light axis direction L; wherein the annular groove 37 of the cam cylinder 30 and the engagement piece 73 of the guide cylinder 70 are formed in an area which overlaps the cam grooves 35, 36 in the light axis direction L. Thus, miniaturization and thickness reduction of the lens barrel are attained while increasing the amount of transfer of the lens frames 41, 51. COPYRIGHT: (C)2007,JPO&INPIT
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