Illumination – Revolving
Patent
1988-09-12
1990-02-20
Husar, Stephen F.
Illumination
Revolving
362 84, 362183, 362802, 362812, 40546, F21V 704
Patent
active
049031724
ABSTRACT:
An illuminated display unit such as a house number, traffic sign, advertisement carrier and the like comprises a fluorescing or photoconductive plate adjacent an edge of which is fitted at least one light-emitting element, in particular a light-emitting diode. The edge is provided with a reflecting layer to prevent emergence of light. Display symbols or their negatives are arranged, as viewed by the onlooker, on the rear face of the photoconductive plate. As a result of the total reflection for a photoconductive plate on the front and back and on the reflecting layer at the edges, the light produced by the light-emitting diode can issue only at the contact surface with the display symbols, so that the light is concentrated very strongly there and a great display brightness is produced. This is even more effective when a contrast surface is arranged behind the plate. In this way great display brightness can be produced with very low electric power, permitting continuous operation or operation with a small number of solar cells.
REFERENCES:
patent: 3316435 (1967-04-01), Kelso
patent: 3497686 (1970-02-01), Young
patent: 4009535 (1977-03-01), Stock
patent: 4573766 (1986-03-01), Bournay, Jr. et al.
patent: 4715137 (1987-12-01), Scheve
patent: 4744012 (1988-05-01), Bergkuist
patent: 4779166 (1988-10-01), Tanaka et al.
patent: 4782432 (1988-11-01), Coffman
Scheid Winfried
Schoniger Karl-Heinz
Hagarman Sue
Husar Stephen F.
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