Optical lens
US7826150B2 · kind B2 · utility
0Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2009 |
| Grant date | Nov 2, 2010 |
| Priority date | — |
| Expiry date | Apr 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/022
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens includes a central optical portion, a peripheral portion surrounding the central optical portion, a first ZnS coating formed on the central optical portion and the peripheral portion at one side of the lens, and a first MgF2 coating formed the central optical, the peripheral portion being free of MgF2 coating formed thereon. The optical thickness of the first ZnS coating is one quarter of a wavelength of predetermined light passing therethrough. The optical thickness of the first MgF2 coating is one quarter of the wavelength of the predetermined light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.