Optical method and system for extended depth of focus
US7061693B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2004 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | Dec 19, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2207/129
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging arrangement and method for extended the depth of focus are provided. The imaging arrangement comprises an imaging lens having a certain affective aperture, and an optical element associated with said imaging lens. The optical element is configured as a phase-affecting, non-diffractive optical element defining a spatially low frequency phase transition. The optical element and the imaging lens define a predetermined pattern formed by spaced-apart substantially optically transparent features of different optical properties. Position of at least one phase transition region of the optical element within the imaging lens plane is determined by at least a dimension of said affective aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.