Wide field of view infrared zoom lens assembly having a constant F/number
US6249374A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1997 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Jan 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/177
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide field of view infrared zoom lens assembly (16) having a constant F/Number. The wide field of view infrared lens assembly (16) includes a focusing component (33), a collecting component (37), an aperture stop (46), and a diffracting component (41). The focusing component (33) may include a pair of focusing zoom lenses (34, 36). The collecting component (37) may include a first collecting lens (38) and a second collecting lens (40). The focusing component (33) and the collecting component (37) may be formed from high dispersion, low index material. The aperture stop (46) may be mounted to the first collecting lens (38) to maintain a constant F/Number. The diffracting component (41) may include a diffractive surface 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.