Patent ID: 6351332
Filing Date: 2002-02-26
Classification: G02B

Abstract:
A method of manufacturing an optical low-pass filter, comprising the steps of:charging a material into a mold; and removing the material molded by the mold, said optical low-pass filter alternately including a phase advancing area which advances a phase of a wavefront of an incident pencil of rays with respect to a phase of a wavefront of a center of the incident pencil of rays, and a phase retarding area which retards the phase of the wavefront of the incident pencil of rays with respect to the phase of the wavefront of the center of the incident pencil of rays, said molding having a shape which corrects an error occurring during molding of said optical low-pass filter, and said phase advancing area and said phase retarding area being alternately formed in a generally non-linear pattern, and in a rotational direction centered at an origin corresponding to the center of the incident pencil of rays.