Fresnel lens with cavities

Details Fresnel lens with cavities Fresnel lens with cavities

2011-03-29

2011-03-29

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With multipart element

Reexamination Certificate

active

07916404

ABSTRACT:
An exemplary Fresnel lens includes a flat emitting surface and a plurality of annular Fresnel lens elements at an opposite side thereof to the emitting surface. Each of the Fresnel lens elements has a non-lens surface perpendicular to the emitting surface and a Fresnel lens surface adjoining the non-lens surface with an acute angle. Each of the Fresnel lens elements has a plurality of spaced cavities defined in the non-lens surface.

REFERENCES:
patent: 2004/0165261 (2004-08-01), Sekiguchi

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