Fresnel lens sheet and rear projection screen
AssigneeDai Nippon Printing Co., Ltd.
InventorsFutoshi Osawa, Makoto Honda
Life of this patent
Estimating the term…
Abstract
A Fresnel lens sheet for a rear projection screen that is used in combination with a single light source comprises a substrate sheet 11 and a Fresnel lens part 12 formed on the substrate sheet 11. The relationship between the haze value H (%) and the thickness T (mm) of the Fresnel lens sheet 10, measured at the center 14 of the Fresnel lens part, fulfills the following expression 1: H≧3.15T3−23.6T2+63.8T−20.5 1.
Claims10
A Fresnel lens sheet for a rear projection screen that is used in combination with a single light source, comprising:
- a substrate sheet, and
- a Fresnel lens part formed on the substrate sheet,
- the relationship between the haze value H (%) and the thickness T (mm) of the Fresnel lens sheet, measured at the center of the Fresnel lens part, fulfilling the following expression 1:
- H≧3.15T3−23.6T2+63.8T−20.5 1.
A rear projection screen that is used in combination with a single light source, comprising a Fresnel lens sheet for deflecting light rays from a single light source to make them nearly parallel to each other, and a light-diffusing sheet for controlling the viewing angle by diffusing the light rays that have been made nearly parallel to each other by the Fresnel lens sheet,
- the Fresnel lens sheet comprising:
- a substrate sheet, and
- a Fresnel lens part formed on the substrate sheet,
- the relationship between the haze value H (%) and the thickness T (mm) of the Fresnel lens sheet, measured at the center of the Fresnel lens part, fulfilling the following expression 1:
- H≧3.15T3−23.6T2+63.8T−20.5 1.
Dependencies are inferred from the claim text.