Illuminated sign with lamp masks for uniform illumination
US6416201B1 · kind B1 · utility
12Cited by
15References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2000 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Mar 31, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F13/0409
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illuminated sign system provides uniform illumination over the lamp face by using partially transmissive lamp masks located between the lamps and the sign face. The sign face itself also diffusely reflects at least a majority of light incident on its second surface back towards the interior of the sign. The lamp spacing ratio in the illuminated signs can be increased, e.g., to a ratio of 3:1 or more, and, possibly, to a ratio of 4:1 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.