Patent ID: 8511831

Claim:
An optical device comprising: a main body made of transparent resin, which has a light incident surface, a light emitting surface facing the light incident surface, and a light-reflecting side surface provided from a periphery of the light incident surface to a periphery of the light emitting surface, wherein, the light incident surface, the light emitting surface and the light-reflecting side surface are mirror-finished, and a pair of supporting portions configured to support the main body, each of the supporting portions provided on the light-reflecting side surface of the main body such that one of the supporting portions is disposed proximate the light incident surface and another is disposed proximate the light emitting surface, wherein a length from the light emitting surface to the supporting portion proximate the light emitting surface is not less than 10% of a length of the main body from the light incident surface to the light emitting surface and a length from the light incident surface to the supporting portion proximate the light incident surface is not less than 10% of the length of the main body from the light incident surface to the light emitting surface, and wherein the supporting portions and the main body are formed in a single-piece, and made of a same transparent resin.