Patent ID: 7470052

Claim:
A light source device comprising: a light source; a light-guiding member for emitting light incident from the light source in a first direction that is different from the incidence direction of the light; and an optical member which totally reflects the light incident from the light-guiding member and emits light in a second direction that is different from said first direction; wherein said optical member has a flat plate composed of a transparent material, and a plurality of circular cones composed of a transparent material and formed on the surface that faces said light-guiding member in said flat plate, said circular cones totally reflecting the incident light; the central axes of said circular cones are parallel to each other; heights of all of said circular cones are the same as each other and there are three imaginary straight lines that link the apex points of said circular cones which are parallel to the surface of said flat plate and have three mutually different directions.