Dual purpose infrared lens assembly using diffractive optics
US5852516A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1997 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Jan 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/1814
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An infrared zoom lens assembly (16) operative as either a continuous zoom or a two-position zoom lens. The infrared zoom lens assembly (16) includes a focusing component (33), a collecting component (37) and a diffracting component (41). The focusing component (33) includes a first focusing zoom lens (34) positioned at the same location at the ends of the zoom range and a second focusing zoom lens (36) movably mounted in the infrared zoom lens assembly (16). The diffracting component (41) may be used to correct color aberrations associated with an infrared waveband. The focusing component (33) and the collecting component (37) cooperate with the diffracting component (41) to focus infrared radiation at an image plane (15) of an infrared detector (18).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.