Patent ID: 8654442
Filing Date: 2014-02-18
Classification: G03B

Abstract:
1. A reflective front screen which reflects light emitted from a front projector, comprising: a light diffusion layer through which only light incident from a specific angular region is diffused and transmitted and through which light incident from the other angular region is transmitted straight; area pairs having a mirror forming area with a predetermined inclination and a non-mirror forming area with a different inclination from the predetermined inclination, the minor forming area and the non-mirror forming area being alternately disposed along a predetermined direction and being bent in a sawtooth shape; a light transmissive layer having a back surface, on which the area pairs are disposed, and an opposite surface to the back surface, the opposite surface being bonded to a back side of the light diffusion layer; and a specular reflection film which is formed on a back surface of each mirror forming area and is formed of a material with reflectivity, wherein an inclination of the mirror forming area with respect to a normal line of the screen close to the front projector becomes larger than the inclination of the mirror forming area far from the front projector within a cross section perpendicular to the mirror forming areas inside the screen, and the reflective front screen satisfies the following equation: where: W is a minimum diameter of a circle through which a virtual beam line, which indicates an upper boundary angle of a projector light incidence allowance angle region in all the area pairs, the projector light incidence allowance angle region being a region where the incidence of the light emitted from the front projector is allowed; H is a height of front screen; and θct