Security device based on customized microprism film
First Claim
1. A security device comprising at least two regions, each region comprising a prismatic surface structure defining an array of substantially planar facets, wherein each region forms a reflector due to total internal reflection when viewed at least one first viewing angle and is transparent when viewed at least one second viewing angle, and wherein the said at least one first viewing angle of one region is different from the at least one first viewing angle of the other region.
1 Assignment
0 Petitions
Accused Products
Abstract
A security device comprises at least two regions, each region comprising a prismatic surface structure defining an array of substantially planar facets. Each region forms a reflector due to total internal reflection when viewed at least one first viewing angle and is transparent when viewed at at least one second viewing angle. The said at least one first viewing angle of one region is different from the at least one first viewing angle of the other region.
-
Citations
60 Claims
- 1. A security device comprising at least two regions, each region comprising a prismatic surface structure defining an array of substantially planar facets, wherein each region forms a reflector due to total internal reflection when viewed at least one first viewing angle and is transparent when viewed at least one second viewing angle, and wherein the said at least one first viewing angle of one region is different from the at least one first viewing angle of the other region.
Specification