Fresnel lens sheet
AssigneeKuraray Co., Ltd.
InventorsKazuo Funazaki, Hideki Kobayashi
Life of this patent
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Abstract
Provided is a Fresnel lens sheet having the advantage of reducing unnecessary rays of light that may go out around the center area of the concentrically-configured Fresnel lens of the sheet. When it is combined with a lenticular lens sheet to construct a viewing screen, the screen has the advantage of preventing white spots from appearing around its center area. The Fresnel lens sheet is for screens for rear projection image displays, and is characterized in that the lens pitch in the center area of the concentrically-configured Fresnel lens of the sheet differs from that in the peripheral area thereof, and that the lens pitch in the center area is larger than that in the peripheral area.
Claims7
A Fresnel lens sheet for screens for rear projection image displays, wherein the lens pitch in a center area of the concentrically-configured Fresnel lens of the sheet differs from that in the peripheral area thereof, and wherein the lens pitch in the center area is larger than that in a peripheral area of the sheet, wherein the lens pitch in the peripheral area is constant.
Dependencies are inferred from the claim text.