Patent ID: 7236312
Filing Date: 2007-06-26
Classification: G02B

Abstract:
1. A collapsible lens barrel comprising: a base; a cam ring rotatably, but axially immovably mounted on said base; a cam groove defined in an inner circumferential surface of said cam ring and extending circumferentially; a lens holder frame nonrotatably, but axially movably disposed radially inwardly of said cam ring, and holding a lens assembly; and a cam pin projecting from an outer circumferential surface of said lens holder frame and engaging in said cam groove; wherein when said cam ring rotates, said cam pin is guided by said cam groove to cause said lens holder frame to move axially; said base having at least two guide posts projecting axially therefrom and disposed at spaced intervals in a circumferential direction of said cam ring; and said lens holder frame having guide grooves defined in an inner circumferential surface thereof, said guide posts engaging in said guide grooves, respectively, whereby said lens holder frame is nonrotatably, but axially movably supported by said guide posts.