Lighting equipment for use as rear light in motor vehicle, has optical medium made of partially transparent material, and including regions that exhibit form of cylinder or paraboloid, such that regions have refractive index gradients

摘要

The equipment has an optical medium (3) made of a partially transparent material. The medium has regions (4-6) exhibiting the form of a cylinder or paraboloid, such that the regions have refractive index gradients. The refractive index of the material changes along a direction perpendicular to the direction of propagation of the light output from light emitting diodes (2). The material distributes the light output from the diodes.