Patent ID: 6172810
Filing Date: 2001-01-09
Classification: G02B,Y10S

Abstract:
A retroreflective article that comprises:a layer of optical elements; anda reflective coating that is disposed in optical association with the optical elements, the reflective coating comprising a plurality of layers wherein (i) at least two adjacent layers have different refractive indices, and (ii) the reflective coating includes one or more polymer layers that each have an average thickness that is less than about 10% of an average size of the optical elements,wherein the reflective coating has a first portion and a second portion, the first portion of the reflective coating having adjacent layers that have different indices of refraction and optical thicknesses selected to redirect light in a first selected wavelength band from a first area of the retroreflective article, and the second portion of the reflective coating having adjacent layers that have different indices of refraction and optical thicknesses selected to redirect light in a second selected wavelength band from a second area of the retroreflective article.