Patent ID: 9733412
Date: 2017-08-15
CPC Classifications: G02B

Claim:
1. A light guide of a lighting device with parallel light source configured to emit rays of light, comprising a body with a light incident side and a light emergent side, the body comprising: a light incident surface, which is a surface of the body at the light incident side, and exactly faces a light emergent surface of a parallel light source so as to guide the rays of light emitted from the parallel light source into the body, the light incident surface and the light emergent surface of the parallel light source are both perpendicular to an optical axis of the body, the rays of light emitted from the parallel light source are all emitted parallel to the optical axis; light emergent surfaces, which are surfaces of the body at the light emergent side, and are used for guiding the rays of light in the body out of the body; and a light guide surface group, which is provided with a plurality of light guide surfaces and is used for guiding at least a part of the rays of light guided into the body via the light incident surface by total internal reflection through interaction of the plurality of the light guide surfaces, and the plurality of the light guide surfaces interact with the light emergent surfaces to determine out-emitting positions of the rays of light guided by total internal reflection by the light guide surface group, on the light emergent surfaces, so that the body is formed with bright areas with guided-out rays of light and dark areas without guided-out rays of light on the light emergent surfaces, one of the bright areas being on the optical axis.