Far infrared imaging lens set, objective lens and detector
US10215971B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2014 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | Dec 1, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A far infrared detector and objective lens and lens set thereof. The far infrared imaging lens set (10) comprises a first lens (100) and a second lens (200) arranged in sequence along a principal axis; the first lens (100) has a first curved surface (102) having a radius of curvature of 2.4×(1±5%) mm and a second curved surface (104) having a radius of curvature of 2×(1±5%) mm; the second lens (200) has a third curved surface (202) having a radius of curvature of 50×(1±5%) mm and a fourth curved surface (204) having a radius of curvature of 60×(1±5%) mm; wherein the first curved surface (102), the second curved surface (104), the third curved surface (202), and the fourth curved surface (204) are arranged in sequence; the first curved surface (102), the second curved surface (104) and the third curved surface (202) are all convex to the object side, and the fourth curved surface is convex to the image side. Distant targets can be detected in dark and foggy environments, and imaging capability is high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.