Spatial filter, a system and method for collecting light from an object
US7924517B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2007 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Sep 6, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A spatial filter that includes multiple opaque regions and multiple transparent regions; wherein at least a pair of opaque regions out of the multiple opaque regions are much longer than a cross sectional dimension of a light beam that impinges onto the spatial filter; and wherein an axial distance between the pair of opaque regions alters as a function of a rotational angle of the spatial filter. A spatial filter that includes multiple opaque regions and multiple transparent regions; wherein multiple groups of transparent regions are substantially shaped as portions of different spirals; wherein the different spirals are characterized by different separation distances between successive spiral turnings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.