Hewlett-Packard Company

Greg P Smestad

David E Silverglate

George Edward Smith

Robert C Gardner

John F Snyder

A lens for a light emitting diode (LED) lamp is formed as two ellipses rather than as one. The ellipses are axially symmetric and are translated away from the optical axis with each ellipse having a focus located on the LED chip away from the central bond pad so that the bond pad shadow does not decrease on-axis light intensity. In alternative embodiments, the depression located at the intersection of the two ellipses is flattened and the axes of the two ellipses are translated away from the optical axis and are also tilted.

Light source having a multiply conic lens

The principles of non-imaging optics, rather than imaging optics, are used to provide a high power LED illumination lamp that has a specified limited viewing angle. A compound parabolic flux extractor extracts and concentrates light emitted by an LED chip and a light pipe continues the concentration into the specified viewing angle. A lens or a diffusant may be used to modify the light output of the lamp. A light constructed as an array of the lamps is suitable for use as an automobile external light such as a center high mounted stop light.

Growing community of inventors

San Jose, CA, United States of America

Greg P Smestad