Patent ID: 7508603
Filing Date: 2009-03-24
Classification: G02B

Abstract:
1. A lens shift mechanism which enables vertical movement of a lens attached to a first member by attaching the first member to a second stationary member so as to be vertically movable with respect to the second member, comprising: N (an integer of three or more) attachment shafts each having a plurality of ball bearings and attached to the first member; and the second member bored with N longitudinal holes located at respective positions corresponding to attachment positions of the N attachment shafts on the first member, each of the N longitudinal holes having a vertical length not shorter than a vertical travel range of the first member; wherein the N attachment shafts are each passed through a corresponding one of the longitudinal holes in such a manner that the second member is put between the pluralities of ball bearings, whereby the first member is attached to the second member so as to be vertically movable with respect to the second member.