Patent ID: 8167469
Filing Date: 2012-05-01
Classification: G02B,G02F

Abstract:
1. A surface light emitting apparatus comprising: a light source section that includes at least one light source that emits a first laser beam; an optical element section that includes at least one diffractive optical element that modifies, by diffraction, a wavefront of the first laser beam emitted from the light source section to form a second laser beam; and an optical guiding section that comprises an incidence surface and a radiation surface, and guides the second laser beam formed by the diffractive optical element and received at the incidence surface, and emits the guided second laser beam through the radiation surface, wherein the optical element section further includes at least one altering optical element that alters an angle of a propagating direction of the second laser beam formed by the diffractive optical element; the altering optical element is a collimating optical element that makes a plurality of the second laser beams formed by the diffractive optical element propagate in directions parallel to one another; and the collimating optical element is a mirror that is folded into zones as a Fresnel optical element.