FRESNEL LENS FOR PROJECTION SCREENS

: 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 ou...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	GOLDENBERG, JILL F, MCKECHNIE, THOMAS S
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:	: 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.