SEMI-TRANSPARENT RETROREFLECTIVE SHEET AND USE THEREOF TO MAKE A BACKLIT LICENSE PLATE

摘要

The present invention provides a semi-transparent retroreflective material having a retroreflective side (16) and an opposite rear side (17), the retroreflective material having a regular or irregular two dimensional pattern of transparent and opaque areas, said retroreflective material comprising a layer of transparent microspheres (20) and a reflective layer located functionally behind said layer of transparent microspheres, said reflective layer comprising a regular or irregular two dimensional pattern of metal areas (11) of contiguous metal and open areas (12) having substantially no metal, wherein open areas (12) of said reflective layer correspond to transparent areas of said retroreflective material and metal areas (11) of said reflective layer correspond to opaque areas of said retroreflective material and wherein said transparent microspheres (20) are present in said transparent and opaque areas and wherein said transparent areas comprise at least 5% of the total surface of said retroreflective material on said retroreflective side (16).