Patent ID: 7282748

Claim:
A light-emitting module that emits light, comprising: a semiconductor light-emitting element that emits light; and a light transmission member that is provided to cover said semiconductor light-emitting element with materials for transmitting the light emitted from said semiconductor light-emitting element and forms a sub-wavelength grating for reducing reflection of the light on its outgoing face for sending the light incident from an interface facing said semiconductor light-emitting element to its outside in grid periods shorter than a wavelength of the light transmitted by said light transmission member; wherein the sub-wavelength grating has a plurality of convex portions protruding in a direction perpendicular to the outgoing face, the plurality of convex portions is arranged at grating intervals shorter than half-wavelength of the light to be transmitted through said light transmission member, and a height of the convex portion is higher than half-wavelength of the light to be transmitted through said light transmission member.