Annular mask lens having diffraction reducing edges
US5905561A · kind A · utility
199Cited by
13References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1996 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | Jun 14, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00923
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Annular mask lens for vision correction having diffraction-reducing edges. The lens body having an annular mask that forms a "soft edge" by gradually decreasing the transmissivity radially from the center aperture to the annular mask area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.