Micro-projection lens
US8493668B2 · kind B2 · utility
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12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2011 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Nov 30, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a micro-projection lens including first lens group, a second lens group, and a third lens group arranged in sequence along an optical axis from a screen side to a light modulator side. The first lens group has positive refractive power and includes at least an aspheric lens. The second lens group has negative refractive power and includes at least a glass tablet. The third lens group has positive refractive power and includes at least an aspheric lens. Therefore, the micro-projection lens of the present invention has a small size and high optical performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.