Fixed-focus projection lens
US10877252B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2019 |
| Grant date | Dec 29, 2020 |
| Priority date | — |
| Expiry date | Mar 30, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/006
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fixed-focus projection lens including a first lens group, an aperture stop and a second lens group arranged sequentially along an optical axis of the fixed-focus projection lens in a direction from an outgoing side to an incoming side. The first lens group includes a first lens element to the sixth lens element arranged sequentially along the optical axis in a direction from the outgoing side to the incoming side. The second lens group includes a seventh lens element to an eleventh lens element arranged sequentially along the optical axis in a direction from the outgoing side to the incoming side. The material of the first lens element is plastic. The material of the second lens element to the eleventh lens element is glass. The fixed-focus projection lens of the disclosure has a smaller size, good optical quality and good durability of high temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.