DIFFUSION ELEMENT, OPTICAL ELEMENT, LIGHT-EMITTING DEVICE, AND PROJECTION DEVICE

摘要

This diffusion element comprises: a transmission member formed using a member that causes light to pass therethrough; and a square column-shaped laminate body in which at least two types of media having different refractive indexes are laminated. The laminate body is arranged upon the transmission member such that the upper surface of the transmission member and the laminate surface are parallel.