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.
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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 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. Furthermore, a security device comprising an asymmetrical or truncated prismatic surface structure is located in a transparent area of an article.
40 Citations
63 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.
- 61. An article having a transparent area extending therethrough and in which is located a security device comprising an asymmetrical or truncated prismatic surface structure, the structure defining an array of substantially planar facets, the structure forming a reflector due to total internal reflection when viewed at least one first viewing angle and being transparent when viewed at least one second viewing angle from the same side of the article.
Specification