Projection display apparatus and projection lens module thereof
US9798118B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2016 |
| Grant date | Oct 24, 2017 |
| Priority date | — |
| Expiry date | Jun 1, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3197
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection display apparatus includes a light source module, an optical engine module and a projection lens module. The optical engine module includes a prism and a light valve. The projection lens module includes a first lens group and a second lens group. The first lens group is disposed between the screen end and the imaging end. The first lens group includes a first lens, a second lens and a third lens, which are sequentially disposed from the screen end to the imaging end and have negative, negative and positive refractive powers, respectively. The second lens group is disposed between the first lens group and the imaging end and has a positive refractive power. The second lens group includes a fourth lens, a fifth lens and a sixth lens, which are sequentially disposed from the screen end to the imaging end and have negative, positive and positive refractive powers, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.