LED projector lamp
US7682041B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 2008 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Oct 1, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED projector lamp includes, in succession along an optical axis thereof, a lamp holder, an LED light source, a light-mixing lens and a cover lens. The LED light source has LED chips arranged inside the lamp holder around the optical axis for emitting different wavelengths of light. The light-mixing lens has a structural surface with parallel lines of protrusions facing the cover lens such that such that the emitted light rays of the LED chips that pass through the structural surface are scattered at least one time and then pass through the cover lens. As a result, the emitted different wavelengths of light can be well mixed before going to the outside of the LED projector lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.