Projection lens and projection device
US11422336B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2020 |
| Grant date | Aug 23, 2022 |
| Priority date | — |
| Expiry date | Oct 17, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The disclosure proposes a projection lens including a first lens group, a second lens group and a third lens group arranged in sequence along an optical axis from a magnification side to a reduction side. The first lens group includes a plurality of lenses having refractive power. The second lens group includes at least one lens having refractive power. The third lens group includes a diaphragm, and a plurality of lenses having refractive power, wherein an intermediate image is formed between the first and third lens groups, and the refractive powers of the first, second and third lens groups are positive, positive, and positive, respectively. A projection device including the above projection lens is also proposed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.