Fresnel lens for projection screens

Details Fresnel lens for projection screens Fresnel lens for projection screens

G - Physics

03

B

88/99

G03B 21/62 (2006.01)

Patent

CA 1268065

Abstract: Fresnel lens for projection screens. A Fresnel lens for use in rear projection screens (SC) wherein said lens (FL) has a plurality of facets (FC) facing away from the image source (T1, T2, T3) and each of said facets has an optimal riser angle (?, said riser angle varying from the center to the outer edge of said lens as a function of the radial distance (h) from the center of the lens, thereby improving the efficiency of the Fresnel lens.

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