Low power drain illuminated sign
US5448843A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1993 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Oct 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/812
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illuminated sign apparatus comprised of a reflector with dedicated cavities which are formed by having the perimeter walls of each cavity conform precisely to each individual area of the sign desiring illumination, typically alphabetic characters and the background area they create. The bottom walls of these cavities will project towards the viewers eye parabolically. The midpoint of the cavity, when viewed in cross section, is to be slightly less in height than that of the cavity-defining perimeter walls. The perimeter walls have point source lights such as light emitting diodes (LEDs) distributed along their surface. These cavities may be filled in with transparent substance, fully encapsulating the LEDs thereby eliminating any reflective air space and facilitating light diffusion. The light sources may be provided with circuitry allowing unique powering to each of the individual cavities, resulting in the possibility of a variety of different display effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.