Patent ID: 7212339
Filing Date: 2007-05-01
Classification: G03B

Abstract:
1. A transmissive screen used for a rear projection type image display apparatus, comprising: a first sheet having a Fresnel lens formed on a light exit surface thereof; a second sheet having plural lens elements formed on a light incident surface thereof, the plural lens elements diffuse light from said first sheet; a first diffusion layer formed of an adhesive material containing a light diffusion material for diffusing light and positioned on a light exit surface of said second sheet; and a second diffusion layer formed of an adhesive material containing a light diffusion material for diffusing light and positioned on a light exit surface of said second sheet; wherein, said second diffusion layer is set in a position in a viewer side direction of said first diffusion layer, the position being separate at a set distance from said first diffusion layer; and said transmissive screen is configured to satisfy the expression: where: θ