Display sign and an optical element for use in the same

Details Display sign and an optical element for use in the same Display sign and an optical element for use in the same

1997-03-06

1999-08-17

Crosland, Donnie L.

Communications: electrical

Visual indication

Audio responsive lamp

34081541, 34081547, 34081576, 362800, G08B 500

Patent

active

059399961

ABSTRACT:
An optical element is fitted to a high intensity light emitting diode used in a variable message sign. The optical element has surfaces which redirect any stray light from the light emitting diode to form useful light. The faces of the optical element are angled to shape the light beam emitted therefrom. The light beam is shaped by the faces to produce a beam having increased intensity in a predetermined direction. The optical element enhances the visibility of the sign and allows a reduction in the number of light emitting diodes used in the sign.

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"Lights, Lighting Circuits, Horns" from "Motor Services Automotive Encyclopedia" p. 427, Jan. 1969.
Patent Abstracts of Japan, Section E-480, p. 109 & JP61-214485, Mar. 1985.

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