Patent ID: 6262840
Filing Date: 2001-07-17
Classification: G02B,G03B

Abstract:
A rear-projection type projector screen, comprising:a plano lens having a light incident side and a light transmission side;said plano lens having a transparent base member disposed at one of said light incident side and said light emission side;said plano lens also having a plurality of minute transparent balls disposed two-dimensionally in a single ball layer on said transparent layer with said minute transparent balls being substantially adjacent to each other;said plano lens also having a colored layer on said transparent layer with said minute transparent balls respectively partially buried in said colored layer so that each of said minute transparent balls has an exposed surface portion projecting from said colored layer toward said light incident side; andeach of said minute transparent balls having an optical characteristic selected from the group consisting of absorbence, spectral absorbence and refractive index, and the optical characteristic of some of said minute transparent balls differing in value from others of said minute transparent balls, and said minute transparent balls being respectively disposed in a single layer with a non-uniform two-dimensional distribution of said differing values of said optical characteristic wherein adjacent sections of the minute transparent balls are non-uniform in a center to periphery direction of the plano lens.