Optical lens
US4146306A · kind A · utility
15Cited by
3References
7Claims
0Family size
Inventor
Key dates
| Filing date | Jun 27, 1977 |
| Grant date | Mar 27, 1979 |
| Priority date | — |
| Expiry date | Jun 27, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical lens having smooth outer surfaces includes at least two layers of different materials and different indices of refraction. Each layer has Fresnel type undulations forming optically active surfaces which interfit or mate with complementary undulations on an adjacent layer in a surface-to-surface and void-free condition. The layers are either fused together or held together by a transparent cement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.