HOLDING STRUCTURE AND POSITIONING METHOD FOR THREE ECCENTRIC LENS

摘要

PROBLEM TO BE SOLVED: To provide a positioning method and a holding structure for an eccentric lens in which the centering axis of a specified eccentric lens is inclined to the common centering axis of the other eccentric lens inside an optical system including three eccentric lenses. SOLUTION: Two eccentric lenses are arranged so that a straight line connecting the centers C11 and C21 of curvature optionally selected one by one from each eccentric lens among the centers of the curvature of totaled four lens surfaces of two optional lenses being first and second eccentric lenses 10 and 20 among the three eccentric lenses is defined as the common centering axis LC of the two eccentric lenses also the common centering axis is aligned with the axial center of a first lens barrel 40, the remaining third eccentric lens 30 is arranged inside a second lens barrel so that the centering axis L31 is aligned with the axial center of the second lens barrel 50, and the second lens barrel is housed inside the first lens barrel so that mutual axial centers can be inclined at a specified angleθ.