Lighting device
US4768133A · kind A · utility
11Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1987 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | Feb 12, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2111/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A lighting device includes a light pipe and a tungsten halogen reflector lamp transmitting light beams parallel with the axis of the light pipe. This allows the use of a dichroic filter which provides for an increased transmission whereby low wattage lamps (36 w) can be used instead of the more usual 100 to 200 w light sources. A number of shaped prisms can be used as end arrangements whereby different effects are obtained, for example, bi-directional, omni-directional or angled beams can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.