Light tunnel with gradient filter layer
US7287863B2 · kind B2 · utility
3Cited by
6References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 2005 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Feb 8, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/208
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light tunnel with a gradient filter layer includes a light tunnel body and a gradient filter layer. In this case, the gradient filter layer is disposed at a light emerging side. The transmission rate at the central area of the gradient filter layer is smaller than the transmission rate at the edge area of the gradient filter layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.