Illumination device having a tapered light guide

摘要

This disclosure provides systems, methods and apparatus for illumination devices. In one aspect, an illumination device having a longitudinal axis includes a light source and a light guide. The light guide has a peripheral edge, a transmissive illumination surface, a center portion, and an upper surface. The transmissive illumination surface is oriented perpendicular to the longitudinal axis and disposed between the center portion and the peripheral edge. The upper surface is oriented relative to the illumination surface to define an angle α therebetween. In some implementations, the angle α can be greater than 15 degrees, for example.

主权项

1. An illumination device, comprising:
a first tapered light guiding section including:
a first light input surface extending along a longitudinal plane,a first light output surface extending along a transverse plane disposed at an angle with respect to the longitudinal plane, anda first inclined surface opposite the first light output surface, the first inclined surface disposed at an angle α1 with respect to the first light output surface, the angle α1 being less than 15 degrees; a second tapered light guiding section including:
a second light input surface extending along the longitudinal plane,a second light output surface extending along the transverse plane, anda second inclined surface opposite the second light output surface, the second inclined surface disposed at an angle α2 with respect to the second light output surface, the angle α2 being less than 15 degrees; and a light source disposed between the first light input surface and the second light input surface, the light source, the first light input surface and the second light input surface being collectively aligned such that
a portion of the light emitted from the light source illuminates the first light input surface, the first light guiding section configured to propagate light received through the first light input surface to the first light output surface, anda portion of light emitted from the light source illuminates the second input surface, the second light guiding section configured to propagate light received through the second light input surface to the second light output surface, wherein at least a portion of light received from the light source and propagating in the first light guiding section propagates in a first direction, and at least a portion of light received from the light source and propagating in the second light guiding section propagates in a second direction opposite the first direction.