Projection system and light tunnel thereof
US7386215B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2007 |
| Grant date | Jun 10, 2008 |
| Priority date | — |
| Expiry date | Mar 30, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light tunnel includes a first optical element, a second optical element, a third optical element and a fourth optical element. The first optical element has a first recess. The second optical element is disposed opposite to the first optical element and has a second recess. The third optical element connects the first optical element with the second optical element and has one end disposed in the first recess or the second recess. The fourth optical element is disposed opposite to the third optical element, connects the first optical element with the second optical element, and has one end disposed in the first recess or the second recess. Inner surfaces of the first to fourth optical elements form a light passage. A projection system is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.