Spatial filter, a system and method for collecting light...

Details Spatial filter, a system and method for collecting light... Spatial filter, a system and method for collecting light...

2011-04-12

2011-04-12

Allen, Stephone B (Department: 2872)

Optical: systems and elements

Absorption filter

Filters in optical parallel

C359S892000, C359S896000

Reexamination Certificate

active

07924517

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.

REFERENCES:
patent: 3009065 (1961-11-01), McKnight et al.
patent: 3614232 (1971-10-01), Mathisen
patent: 6392793 (2002-05-01), Chuang et al.
patent: 6545265 (2003-04-01), Czarnetzki et al.
patent: 6830342 (2004-12-01), Lee
patent: 2003/0058433 (2003-03-01), Almogy et al.

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