Patent ID: 8577189
Filing Date: 2013-11-05
Classification: G02B,Y10T

Abstract:
1. A light guide comprising: a core made of material having translucency; and an optical path conversion mirror portion formed with an optical path conversion mirror surface, on at least the core at an end, for reflecting a signal light from an optical element and converting the optical path of the signal light, wherein the signal light is transmitted through the core by the reflection at the optical path conversion mirror surface, wherein the optical path conversion mirror surface has an angle formed with a bottom surface of the core changing in an X-direction in a cross-sectional shape in which the optical path conversion mirror portion is cut at a YZ plane, the Y-direction being an optical axis direction of the optical element, the Z-direction being an advancing direction of the signal light of the light guide, and the X-direction being a direction perpendicular to both the Y-direction and the Z-direction, and wherein cross-sectional shapes of an upper side and a lower side of the optical path conversion mirror are asymmetric to a center cross-sectional shape of the core in the X-direction.