Patent ID: 8152317
Filing Date: 2012-04-10
Classification: G02B,G03B,H04N

Abstract:
1. A light source device comprising: a solid light emitting element provided as a surface emitting source, the solid light emitting element having a reflecting film arranged on the back side of the solid light emitting element and a light emitting face arranged on the front side of the solid light emitting element; an optical element having a first face opposed to the light emitting face of the solid light emitting element through a gap, second and third faces opposing in parallel to each other and both substantially perpendicular to the first face, a fourth face substantially perpendicular to the second and third faces and also obliquely-opposed to the first and a fifth face having a rim formed by respective one side edges of the first to fourth faces the optical element defining a polyhedron surrounded by the first to fifth faces and also filled up with a medium having a refractive index more than a refractive index of a circumferential medium surrounding the optical element; and a polarization converting element having an incident surface opposing in substantially-parallel to the fifth face through a space whose refractive index is equal to or less than the refractive index of the medium forming the optical element, the polarization converting element comprising a polarization separating element for polarization-separating flux entering from the optical element to the incident surface, a first reflecting surface for reflecting one of fluxes separated in polarization and a wave plate for converting either of phases of the fluxes separated in polarization, wherein: the fifth face of the optical element is formed with an area smaller than an area of the light emitting face, whereby light generated from the solid light emitting element enters the optical element through the first face, and is emitted to an outside through the fifth face and subsequently, the light enters the polarization converting element where the polarization of the light is converted and combined, and wherein the optical element further includes a sixth face opposed to the fifth face and having a rim formed by respective other side edges of the first to fourth faces.