Extreme wide angle, very large aperture, compact, UV imaging lens
US5504618A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Jun 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/143
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An extreme wide angle, very large aperture, very compact, solar blind, UV imaging lens system. The lens system has a fused silica polyvinyl alcohol glass color filter, a lens made of fused silica, a lens made of nickel sulfate, a layer of coupling fluid and another lens made of fused silica. Alternatively, sapphire can be used after the color filter instead of the fused silica. An alternative lens is composed of two layers of fused silica, a layer of nickel sulfate, another layer of fused silica, coupling fluid followed by polyvinyl alcohol, a color glass filter and coupling fluid followed by fused silica. In a fourth embodiment, the two layers of fused silica are followed by polyvinyl alcohol, a layer of colored glass filter, fused silica, nickel sulfate, coupling fluid, and fused silica.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.