Patent ID: 7210793

Claim:
A light source unit, comprising: a surface emitting part including a planer emitting region to emit light; a reflecting part provided on one surface side of the surface emitting part; and a conical prism or a pyramid prism, each having a bottom surface and an inclined surface, provided on an other surface side of the surface emitting part and including an optical transparent member, the bottom surface of the conical prism or the bottom surface of the pyramid prism having substantially the same size and shape as the planer emitting region, the inclined surface of the conical prism or the inclined surface of the pyramid prism outputting light refracted by the inclined surface in a specific direction and guiding light reflected by the inclined surface toward the bottom surface, of light that has entered the conical prism or the pyramid prism from the bottom surface, and the reflecting part reflecting light that has been reflected by the inclined surface and transmitted through the bottom surface and the surface emitting part again toward the conical prism or the pyramid prism.