Light bulb using solid-state light sources

摘要

A light bulb has a light guide configured as a hollow body surrounding an internal volume. The light guide is open at its proximal and distal ends, and has inner and outer surfaces and an end surface at the proximal end that provides a light input edge. A solid-state light source is optically coupled to the light input edge of the light guide such that light from the solid-state light source travels in the light guide by total internal reflection. The solid-state light source is thermally coupled to a housing at the proximal end of the light guide. The housing contains vents for air flow and convection cooling through the internal volume. Light-extracting optical elements at least one of the inner surface and the outer surface of the light guide are for extracting light from the light guide.

主权项

1. A light bulb comprising: a first light guide configured as a hollow body surrounding an internal volume, the first light guide being open at a proximal end and a distal end, opposite the proximal end, and comprising an inner surface, an outer surface and an end surface at the proximal end that provides a light input edge; a solid-state light source optically coupled to the light input edge such that light from the solid-state light source travels in the light guide by total internal reflection; a housing at the proximal end of the light guide, the solid-state light source being thermally coupled to the housing, the housing defining vents for air flow and convection cooling through the internal volume; and light-extracting optical elements at least one of the inner surface and the outer surface of the light guide for extracting light from the light guide; and a second light guide comprising an inner surface facing toward the internal volume; wherein the second light guide is configured as a hollow body surrounding the internal volume, the second light guide being open at a proximal end and a distal end, opposite the proximal end, the second light guide comprises an outer surface and an end surface at the proximal end of the second light guide that provides a light input edge, wherein one of the light guides is positioned in the other light guide with an air gap between the light guides; a second solid-state light source is optically coupled to the light input edge of the second light guide such that light from the second solid-state light source travels in the second light guide by total internal reflection, the second solid-state light source being thermally coupled to the housing; and additional light-extracting optical elements are at least one of the inner surface and the outer surface of the second light guide to extract light from the second light guide.