Compact variable diffuser for use in a luminaire
US4972306A · kind A · utility
28Cited by
27References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1989 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Jan 23, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2131/406
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A tambour-type panel of sections movable in a U-shaped track system from a side location in a housing to a location in the path of light. The panel sections are constructed to diffuse light passing therethrough. Each section of the diffusing panel has a texturing which diffuses the light with different degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.