Patent ID: 6475557
Filing Date: 2002-11-05
Classification: B29D,C23C,G02B

Abstract:
A method for manufacturing a disk optical filter, comprising the steps of:providing a mask over a substrate, the mask being capable of being relatively rotated with respect to the substrate coaxially on a plane parallel to the substrate and the mask having an aperture extending along a radius direction with an aperture angle &phgr;; and depositing a dielectric material in a single layer or multiple layers on the substrate from the mask side within a deposition chamber, while relatively rotating the mask with respect to the substrate at least once at a non-constant angular speed during a formation of the single layer or the multiple layers on the substrate so as to form the disk optical filter in which the transmission wavelength increases or decreases with respect to angle in a rotation direction of the substrate except for an angular zone &phgr;.