Method of manufacturing a diffraction lens other than an aphakic intraocular lens
US8755117B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2009 |
| Grant date | Jun 17, 2014 |
| Priority date | — |
| Expiry date | Aug 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A novel manufacturing method for a diffraction lens, whereby aperture and eccentricity effects can be suppressed and any multi-focusing effect can also be obtained in a more stable manner. A synchronous structure is set up where at least two reliefs whose first order diffracted lights give respective focal distances different from one another are set to overlap with each other in at least a part of an area in a radial direction of a diffraction lens, and with respect to every grating pitches of one relief having the maximum grating pitch among the reliefs set up in overlap, grating pitches of another relief are overlapped periodically; and the resulting relief pattern is formed on a surface of an optical material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.