Multiple contour diffractive lens
US5114220A · kind A · utility
104Cited by
2References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 1989 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | May 15, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is an ophthalmic lens which characteristically comprises at least two concentric regions having diffractive components with different phase profiles in order to use different orders of diffraction. The diffractive components may be formed by holograms in relief or index holograms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.