Patent ID: 6666944
Filing Date: 2003-12-23
Classification: G02B,Y10T

Abstract:
A method of manufacturing an optical filter including two band-pass filters having dielectric multilayer coatings, the optical surfaces of the filters being substantially arranged parallel to each other, the method comprising:forming on a front surface of a transparent substrate a band-pass filter coating having a dielectric multilayer coating which has a grading characteristic corresponding to a transmission wavelength; forming on a back surface of said transparent substrate a band-pass filter coating having a dielectric multilayer coating which has a grading characteristic corresponding to a transmission wavelength being in a direction perpendicular to said grading characteristic of said band-pass filter coating formed on said front surface of the transparent substrate; and cutting out a segment at a specific area of said transparent substrate formed with said band-pass filter coatings at said front and back surfaces of the transparent substrate.