Imaging system and optical engine
US7946716B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 2008 |
| Grant date | May 24, 2011 |
| Priority date | — |
| Expiry date | Aug 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging system and an optical engine comprising the imaging system are provided. The imaging system in this invention at least comprises a lens assembly, a light valve, and a Fresnel lens. The Fresnel lens is formed with a receiving portion adapted to correspondingly receive at least one portion of the lens assembly and replaces the conventional aspheric lens to focus a light ray onto the light valve. The light valve reflects the light ray into the lens assembly for imaging. Thereby, the Fresnel lens is adapted to decrease the surface area of the receiving portion to eliminate the influence of stray light on the imaging quality and to economize lens material costs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.