Lighting device for generating a rectangular pattern at the work area, E. G. for illuminating pedestrian crossings
US5997156A · kind A · utility
15Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Dec 4, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2131/103
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device which can be used for illuminating pedestrian crossings or in other applications where it is necessary to form a defined and uniform rectangular pattern includes a parabolic reflector element and a planar screen with an array of cylindrical microlenses or microprisms on a surface thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.