Projection apparatus and projection lens with three lens groups
US9915810B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 2016 |
| Grant date | Mar 13, 2018 |
| Priority date | — |
| Expiry date | Apr 21, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection lens and a projection apparatus are provided. The projection lens has a screen side and an image side. The projection lens includes a first lens group, a second lens group, and a third lens group. The first lens group disposed between the screen side and the image side includes a first, a second, and a third lenses arranged sequentially from the screen side to the image side. The second lens group disposed between the first lens group and the image side includes a fourth, a fifth, a sixth, a seventh, an eighth, a ninth, and a tenth lenses arranged sequentially from the screen side to the image side. The third lens group disposed between the second lens group and the image side includes an eleventh and a twelfth lenses, and a distance between the twelfth lens and the light valve is a constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.