Light guide with narrow angle light output and methods
First Claim
1. An illumination system comprising:
- a light guide substantially having a shape of a bar with a length longer than a width, and formed of a material configured to propagate light therein, the light guide including;
an elongated output surface;
an elongated back side opposite the output surface, wherein the output surface is wider than the back side;
light extraction elements dispersed along the length of the light guide, wherein the light extraction elements are configured to direct light out of the light guide through the output surface; and
one or more tapered side walls that extend from the output surface to the back side, wherein the tapered side walls are configured to partially collimate the light directed out of the output surface.
2 Assignments
0 Petitions
Accused Products
Abstract
This disclosure provides systems, methods, and apparatus for providing illumination. In one aspect, a light guide can be configured to propagate light received from a light source. The light can be propagated by total internal reflection (TIR) within the light guide. The light guide can include an output surface configured to output light and one or more light extraction elements, which are configured to redirect the light propagating in the light guide so that the light exits the light guide through the output surface. The light guide can have tapered side walls that are configured to at least partially collimate the light that is to exit out of the output surface. In some implementations, the light guide can be used to provide illumination for display devices, other electromechanical systems, or for lighting a room or task area.
75 Citations
25 Claims
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1. An illumination system comprising:
a light guide substantially having a shape of a bar with a length longer than a width, and formed of a material configured to propagate light therein, the light guide including; an elongated output surface; an elongated back side opposite the output surface, wherein the output surface is wider than the back side; light extraction elements dispersed along the length of the light guide, wherein the light extraction elements are configured to direct light out of the light guide through the output surface; and one or more tapered side walls that extend from the output surface to the back side, wherein the tapered side walls are configured to partially collimate the light directed out of the output surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of making a light guide substantially having a shape of a bar with a length longer than a width, the method comprising:
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providing a material configured to propagate light therein, the material shaped to have an elongated output surface, an elongated back side opposite the output surface, and one or more tapered side walls that extend from the output surface to the back side, wherein the output surface is wider than the back side, and wherein the tapered side walls are configured to partially collimate light directed out of the output surface; and providing light extraction elements along the length of the light guide, wherein the light extraction elements are configured to direct light out of the light guide through the output surface. - View Dependent Claims (24, 25)
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Specification