Patent ID: 8246236

Claim:
A light guide device comprising: a polygonal light guide loop comprising a plurality of optical coupling structures formed at insides of corners of the polygonal light guide loop, respectively, each optical coupling structure comprising a light incident surface, a reflecting surface, and a light emitting surface perpendicular to the incident surfaces and the reflecting surfaces, the reflecting surface of each optical coupling structure being obliquely connected to the light incident surface of each optical coupling structure at an obtuse angle; a plurality of light guide prisms interconnected between adjacent optical coupling structures, each of the light guide prisms comprising an inner surface, an outer surface parallel to the inner surface, an upper surface perpendicularly connected between the inner surface and the outer surface, and a lower surface parallel to the upper surface, the incident surface of each optical coupling structure being perpendicularly connected to the inner surface of an adjacent light guide prism; and a plurality of luminaries respectively facing the light incident surfaces of the optical coupling structures for emitting light to the optical coupling structures.