Patent ID: 6172814
Filing Date: 2001-01-09
Classification: G02B,G03B

Abstract:
A piano lens comprising:a transparent base member having a light incident side and a light emission side;a plurality of minute transparent balls disposed two-dimensionally in a single ball layer on said transparent base member with said minute transparent balls being substantially adjacent each other;a colored layer on said transparent base member 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 said single ball layer with a non-uniform two-dimensional distribution of said differing values of said optical characteristic.