Dichroic beam combiner utilizing blue LED with green phosphor
US7144121B2 · kind B2 · utility
52Cited by
24References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2004 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Nov 12, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/80
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A white beam with high color-rendering index is formed by uniting a collimated red beam and a collimated blue-green beam, the latter having as its source a blue LED with a green phosphor. The white beam is formed by a prism with an amber low-pass dichroic filter. The prism cross-section can be either a square or an equilateral triangle. The triangular prism can have one third of its mass reduced by stepped facets. Both types of prism can be elongated to accommodate multiple collimators. Switching between white, red, and blue-green allows application to police vehicles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.