Patent ID: 8848139

Claim:
A light source apparatus comprising: a planar light source that emits light in a planar state; a deflecting element that deflects and emits incident light such that a direction in which the incident light is deflected varies depending on an incident position of the incident light; and a light-ray direction restricting element that comprises a transmissive area and an absorptive area and is disposed in an optical path of the incident light to restrict a traveling direction of the incident light to a direction that is parallel to the optical path so that the incident light has a high-directivity, the light source apparatus being configured to focus the light from the planar light source toward a single externally-positioned imaginary point or a single straight line orthogonal to a light-ray restricting direction of the light-ray direction restricting element, wherein the light-ray direction restricting element has a configuration that a refractive index of the transmissive area is greater than a refractive index of air, whereby an angle between a principal axis direction of the light restricted and emitted by the light-ray direction restricting element and a surface normal line direction of the planar light surface is greater than an angle between a principal axis direction of the incident light into the light-ray direction restricting element and the surface normal line direction.