Collector for an LED array

Details Collector for an LED array Collector for an LED array

1985-03-11

1988-08-30

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355 1, G02B 632, G03B 2700

Patent

active

047671726

ABSTRACT:
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.

REFERENCES:
patent: 1977689 (1934-10-01), Muller
patent: 2215900 (1940-09-01), Bitner
patent: 2683394 (1954-07-01), Polanyi et al.
patent: 3330190 (1967-07-01), Taillie
patent: 4255042 (1981-03-01), Armitage et al.
patent: 4257672 (1981-03-01), Balliet

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