Card – picture – or sign exhibiting – Illuminated sign – Edge illuminated
Patent
1981-05-29
1983-02-15
Mancene, Gene
Card, picture, or sign exhibiting
Illuminated sign
Edge illuminated
40563, 362 31, G09F 1318, G09F 1300, F21V 704
Patent
active
043732828
ABSTRACT:
A device for illuminating a display surface. Light is introduced through an end surface of a transparent substrate having front and back plane parallel opposed surfaces and thereby directed into the interior of the substrate. The back surface is textured with a multiplicity of shallow depressions such as grooves or dimples which have shallow sloped sides. These sides are configured so that light is selectively directed from the interior of the substrate through a limited angle out of the substrate towards a display surface adjacent and coextensive with the back surface of the substrate and away from a viewer observing the display surface through the substrate. The device provides uniform, high contrast illumination of underlying large area graphic displays such as maps, photographs, charts, and the like.
REFERENCES:
patent: 2082724 (1937-06-01), Shelar
patent: 2358203 (1944-09-01), Best
patent: 2443561 (1948-06-01), Greenwald
patent: 2566026 (1951-08-01), Hughes, Jr.
patent: 3023304 (1962-02-01), Peterson
patent: 3328570 (1967-06-01), Balchunas
patent: 3808415 (1974-04-01), Hurst
patent: 3885144 (1975-05-01), Lewis et al.
patent: 4106859 (1978-08-01), Doriguzzi et al.
patent: 4285889 (1981-08-01), Parsons
Foycik Michael J.
Hughes Aircraft Company
Karambelas A. W.
MacAllister W. H.
Mancene Gene
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