Infrared refractive objective lens assembly
US9823451B2 · kind B2 · utility
5Cited by
52References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 11, 2014 |
| Grant date | Nov 21, 2017 |
| Priority date | — |
| Expiry date | May 29, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0062
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A mid-infrared objective lens assembly (10) includes a plurality of spaced apart, refractive lens elements (20) that operate in the mid-infrared spectral range, the plurality of lens elements (20) including an aplanatic first lens element (26) that is closest to an object (14) to be observed. The first lens element (26) has a forward surface (36) that faces the object (14) and a rearward surface (38) that faces away from the object (14). The forward surface (36) can have a radius of curvature that is negative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.