Patent ID: 6707622
Filing Date: 2004-03-16
Classification: B29C,B29L,G02B

Abstract:
A resin-molded prism comprising:two optical surfaces that are not parallel to each other; a pair of side end faces substantially perpendicular to said optical surfaces; at least one reference block projecting from either one of said pair of side end faces and having a circumferential end face extending in a projecting direction of said reference block; a positioning portion formed on the circumferential end face of said reference block; a curved surface for smoothly connecting the circumferential end face of said reference block and corresponding one of said pair of side end faces; and a gate that projects from said reference block in the projecting direction thereof and has a circumferential end face extending in the projecting direction, wherein the circumferential end face of said reference block and the corresponding one of said side end faces form an angle of not less than 90Â° and a central axis of said gate in the projecting direction thereof is arranged to form one straight line with a line that connects barycentric positions of said pair of side end faces.