Light diffusion box
US5023756A · kind A · utility
Inventor
Key dates
| Filing date | Jun 13, 1989 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Jun 13, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V3/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved light diffusion box for photographic, industrial and consumer uses. The light diffusion box includes a hollow housing of fabric material provided with a front screen and having means for securing a ring to the rear end thereof, the ring being adapted to mount a light source within the housing. The housing has sides which are coupled together and each side has a silver laminate layer adjacent to a thin, white nylon layer. A deflection/transmission panel is between the light source and the front screen. A graduated or alternated deflection/transmission pattern is printed on at least one face of the panel and such pattern is equal and opposite to the naturally-occurring light fall-off from the light source. The center of the pattern forces the strong light nearest the source to be largely deflected into the sidewalls of the housing and only slightly transmitted. As the pattern radiates outwardly on the panel the pattern allows more and more light to be transmitted through the panel and less to be deflected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.