Patent ID: 9464785
Filing Date: 2016-10-11
CPC Classification: B60Q,F21S,F21V,F21W,F21Y,G02B

Claim Text:
1. A light guide, comprising: a light chamber defined by isotropic, light-scattering top, bottom, and back surfaces, a front surface having a translucent lens and a length; a mirror-like reflective diaphragm within the chamber that defines a top gap between the diaphragm and the top surface, and a bottom gap between the diaphragm and the bottom surface, and spans the length of the chamber, wherein the diaphragm is spaced from the translucent lens, about one third of the distance between the lens and the back surface; and an LED light source located between the diaphragm and the back surface of the chamber, wherein the light chamber is further defined by a substantially constant cross-sectional area across the length of the chamber, and is configured in the shape of a rectangular cuboid having two opposed, parallel ends, and, further, wherein the ratio between the total height of the gaps and the distance between the top and bottom surfaces of the light chamber is approximately 1:4 to 1:9, and further wherein the LED light source is located at one of the opposed ends of the light chamber and oriented to emanate incident light toward the other of the opposed ends of the light chamber such that only a portion of the incident light strikes the diaphragm, and further wherein the rectangular cuboid has a length that spans the longest axis of the cuboid and the two opposed, parallel ends are at the respective ends of the length.