Optical element, its manufacturing method and optical element manufacture metal die

Abstract

An optical element having a complex structure of diffraction grating, an inclined surface, a difference in level and the like and of good optical characteristics, its manufacturing method, and an optical element manufacturing metal die capable of injection molding the optical element are disclosed. By using an optical element manufacturing metal die constituted to have nestings which have mirror surface forming portions two adjoining pairs of mirror surfaces of the optical element are molded by two adjoining pairs of mirror surface forming portions which are formed on the same nesting. The optical element manufacturing metal die is constituted to include the nesting having a diffraction grating forming portion in which a predetermined concave-convex pattern for molding the diffraction grating of the optical element is formed on one surface of a substrate.

Dependencies are inferred from the claim text.