Patent ID: 7199951
Filing Date: 2007-04-03
Classification: G02B

Abstract:
1. A decentering optical system comprising, at least one decentering prism, and a holding component for holding the decentering prism, wherein the decentering prism has two or more positioning portions at positions which sandwich an effective diameter of an optically functional surface thereof held by the holding component, wherein the holding component has positioning-portion holding portions to be mated with the positioning portions of the decentering prism, wherein either the optically functional surface held by the holding component or the holding component has at least two projected portions at-positions that are located outside of the positioning portions of the decentering prism or the positioning-portion holding portions of the holding component as sandwiching the effective diameter of the optically functional surface, and wherein the decentering prism is positioned and fixed to the holding component through the positioning portions, the positioning-portion holding portions and the projected portions.