Variable transmission composite interference filter
US8314991B2 · kind B2 · utility
1Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2008 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Apr 13, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/288
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Now, according to the present invention, interference filters are provided that incorporate two band pass interference filters into a single composite interference filter. The two filters each have at least one band pass curve that is centered at the same wavelength for light that is incident at a given angle to the filter surface. The band pass curve shifts of the filter components, however, are dissimilar, which results in a decrease of transmitted light as the angle of incidence diverges from the given angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.