Patent ID: 9097854
Filing Date: 2015-08-04
Classification: B29D,B41M,B42D,G02B

Abstract:
1. An optical device exhibiting a shift of color upon rotation, comprising: a substrate having an array of structures disposed thereon or therein, wherein each of the structures has first and second surfaces having a line of mutual intersection forming a non-zero angle with a plane of the substrate; and a color shifting coating supported by the substrate, forming color shifting reflectors with each of the first and second surfaces, wherein each color shifting reflector has a color which shifts as an angle of observation of the reflector changes, wherein upon rotation of the optical device in the plane of the substrate, the angle of observation of each color shifting reflector changes causing a corresponding color shift of each color shifting reflector, whereby the shift of color of the optical device is observable by rotating the optical device in the plane of the substrate; wherein the first and the second surfaces each have a width and a length larger than 2 microns, so that no significant diffraction of visible light occurs.