Fresnel lens sheet, light-transmission screen, and...

Details Fresnel lens sheet, light-transmission screen, and... Fresnel lens sheet, light-transmission screen, and...

2011-01-18

2011-01-18

Mahoney, Christopher (Department: 2862)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S460000, C359S742000

Reexamination Certificate

active

07872801

ABSTRACT:
The Fresnel lens sheet according to the present invention has a plurality of prismatic Fresnel lens elements including a Fresnel facet, a riser facet, and a top facet crossing the facet and the riser facet on an entrance surface. An angle of the top facet of each Fresnel lens element constituting the lens relative to the an exit surface, δ1, is determined so that an exit angle of the light that has entered each of the top facets and exits from the exit surface, β, is greater than 35 degrees.

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patent: WO2005/059641 (2005-06-01), None

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