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 light guide including
a peripheral edge disposed about a longitudinal axis of the illumination devicea center portion having a light entry surface configured to allow light from a light source to propagate into the light guide through said light entry surface;a transmissive illumination surface oriented perpendicular to the longitudinal axis and disposed between the center portion and the peripheral edge; andan upper surface disposed between the center portion and the peripheral edge, the upper surface oriented relative to the illumination surface to define an angle α therebetween, wherein the angle α is less than 15 degrees.