FIELD: physics.
SUBSTANCE: lens has four components. The first - a negative meniscus from germanium, the second - a positive meniscus, the third - a negative meniscus from zinc selenide. All menisci face the image plane with their concave surfaces. The fourth component - a positive lens. The second and the fourth components are made of oxygen-free glass IKS-25 or chalcogenide glass IRG-26. The second surfaces of the first and the second components are made aspherical with asphericity coefficient of 0.42 to 1.56 and from minus 0.86 to 2.6, respectively. Relations are made between the optical forces of the components and the air gaps between them, as indicated in the claim.
EFFECT: increasing the field of view and expanding the temperature range of the lens.
2 cl, 3 dwg, 5 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| ATHERMALISED LENS FOR IR SPECTRUM AREA | 2016 |
|
RU2618590C1 |
| INFRARED LENS WITH PASSIVE THERMALIZATION | 2016 |
|
RU2629890C1 |
| ATHERMALISED LENS FOR INFRARED SPECTRUM | 2015 |
|
RU2613483C1 |
| WIDE ANGLE ATHERMALIZED INFRARED LENS WITH LARGE BACK | 2021 |
|
RU2762997C1 |
| WIDE-ANGLE INFRARED LENS | 2017 |
|
RU2650743C1 |
| THREE-LINEAR AMERICANIZED CAMERA LENS FOR THE IR-REGION OF THE SPECTRUM | 2016 |
|
RU2645446C1 |
| TELEPHOTO LENS FOR SPECTRUM IR | 2019 |
|
RU2709050C1 |
| INFRARED THREE-LENS OBJECTIVE | 2017 |
|
RU2643707C1 |
| LENS FOR INFRARED SPECTRAL AREA | 2016 |
|
RU2620202C1 |
| HIGH-SPEED THREE-LENS OBJECTIVE FOR IR SPECTRUM | 2016 |
|
RU2629887C1 |
