Patent ID: 6169633
Filing Date: 2001-01-02
Classification: G02B,G03B

Abstract:
A rear projection screen for use in a rear projection type television, comprising: a Fresnel lens sheet for making projected rays almost parallel with each other; and a lenticular lens sheet arranged on the light-emerging side of the Fresnel lens sheet, wherein (1) the lenticular lens sheet comprises a light-entering lens part formed on the light-entering surface, in which a plurality of light-entering lenses, each having a substantially elliptical cross section, are arranged, and a light-emerging lens part formed on a light-emerging-side surface, in which a plurality of light-emerging lenses, each having a concave cross section, are arranged so that they correspond to condensing positions of the respective light-entering lenses in the light-entering lens part, and the focal points of the respective light-entering lenses are inside the corresponding light-emerging lenses.