Card – picture – or sign exhibiting – Illuminated sign – Three-dimensional alphanumeric structure
Patent
1995-06-07
1997-12-16
Green, Brian K.
Card, picture, or sign exhibiting
Illuminated sign
Three-dimensional alphanumeric structure
40570, 40581, 362800, 362812, G09F 1300
Patent
active
056971753
ABSTRACT:
An illuminated sign apparatus comprised of a reflector with dedicated cavities. Each letter and, optionally, background area, comprises a shaped cavity, illuminated indirectly by a plurality of near-point sources such as light-emitting diodes located in the center of the cavity, either on a separate perpendicular circuit board or on a central projection formed in the bottom of the cavity, with the light emitted by the sources pointed outwards. In another embodiment, the letter cavities and background are illuminated by parallel boards along the top, bottom, and (optionally) middle of the letter cavities, with the light sources directed along the axes of the letter strokes. In another embodiment, the light sources in the center of the cavity are electroluminescent and ultraviolet emitting, and the cavity can be coated with a UV activated flourescent coating which is activated by the EL light source. The light is evenly reflected upward toward the viewer, giving the illusion of a solid letter or background. The cavities may be filled with a transparent substance.
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Green Brian K.
Spectralight, Inc.
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