Optically active materials and articles and systems in which they may be used

摘要

The inventors of the present application developed novel optically active materials, methods, and articles. One embodiment of the present application is an optically active article, comprising: an infrared-reflecting material positioned adjacent to an optically active substrate such that the infrared-reflecting material forms a pattern that can be read by an infrared sensor when the optically active substrate is illuminated by an infrared light source. Another embodiment of the present application relates to a method of manufacturing an optically active article, comprising: obtaining an optically active sheeting; and positioning an infrared-reflecting material on the optically active sheeting to form a pattern. The optically active article may be, for example, a license plate.

主权项

1. A method of manufacturing a retroreflective article, comprising:
obtaining a retroreflective sheeting; and positioning an infrared-reflecting multi-layer optical film on the retroreflective sheeting to form a pattern; wherein the infrared-reflecting multi-layer optical film is transparent and not significantly visible in the visible light spectrum; and wherein the retroreflective sheeting causes incident light to retroreflect via a retroreflective light path, and wherein the infrared-reflecting multi-layer optical film causes incident infrared light to be reflected from the retroreflective light path.