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US 4,767,172 AGranted
Collector for an LED array
AssigneeXerox Corporation
InventorsVirginia R. Nichols, Fred F. Hubble, III, James P. Martin
Life of this patent
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AssigneeXerox Corporation
InventorsVirginia R. Nichols, Fred F. Hubble, III, James P. Martin
Estimating the term…
A light collector for an LED array for efficiently collecting and collimating light emitting from the LEDs and projecting the light into an optical wave guide which directs that light onto a photoreceptor surface. Each LED is centered in a hemispherical cavity in the collector array in order that radiation from the LED enters the collector essentially unrefracted. The collector array provides a convex lens portion and a parabolic reflecting surface portion. Light that exits from the LED that is substantially perpendicular to the substrate supporting the LED is applied to the convex lens and is collimated. Light exiting substantially parallel to the substrate strikes a parabolic reflecting surface at greater than the critical angle and is also collimated. The two concentric collimated beams are combined and applied to the photoreceptor surface via a light pipe or optical wave guide secured to the collector.
A molded light collector for collimating the light rays emitting from a relatively wide emission light source for coupling to an optical wave guide, the light source being an LED mounted on a substrate, the light collector enclosing the LED and forming a hemispherical cavity around the LED, a portion of the light collector being integrally secured to the substrate, the light collector comprising
Dependencies are inferred from the claim text.