COMPOUND LENS, METHOD FOR ASSEMBLING COMPOUND LENS, FIXED DIAPHRAGM AND METHOD FOR MOLDING FIXED DIAPHRAGM

摘要

PROBLEM TO BE SOLVED: To provide a compound lens whose positional accuracy between a lens and a fixed diaphragm, between the lenses and between the fixed diaphragms is improved, and its assembling method. SOLUTION: This compound lens 1 is provided with 1st and 2nd lenses 2 and 10 and the fixed diaphragm 20 equipped with an aperture hole 21a in center and intercepting unnecessary bundle of rays out of the bundle of rays transmitted through the lenses 2 and 10, and the lenses 2 and 10 and the fixed diaphragm 20 are integrally assembled. The lenses 2 and 10 are respectively equipped with abutting parts 2e and 10e regulating the relative position in an optical axis direction by abutting on each other in the optical axis direction and tapered parts 2d and 10d fit with each other so as to align the optical axis. The diaphragm 20 is equipped with a tapered part 21b fit in the inner periphery of the tapered part 2d of the lens 2 so as to regulate the relative position in the optical axis direction to the lens 2 and align the center axis of the hole 20a with the optical axis.