Compact orthoscopic VNIR/SWIR lens
US10620408B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2017 |
| Grant date | Apr 14, 2020 |
| Priority date | — |
| Expiry date | Nov 13, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact orthoscopic lens is corrected for monochromatic and chromatic aberrations over wavelengths from 450 to 2450 nm with an angular FOV of 5.56° vertical and 66° horizontal. The 4.36″ effective focal length lens with f-number of 4 is compact measuring 5.2″ from the first optical surface to the image. The lens includes, in order from object to image, a first optical group having a negative optical power; a second optical group having a positive optical power and a third optical group having a negative optical power. The first optical group consists of two elements, the second optical group consists of three elements, one a doublet, and the third optical group consists of two elements. A physical aperture stop is positioned inside the second optical group. Powers of groups and elements, shapes, refractive indices, Abbe numbers and partial dispersions of glasses are selected so the lens is apochromatic and orthoscopic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.