Retroflector

Details Retroflector Retroflector

2005-12-13

2005-12-13

Phan, James (Department: 2872)

Optical: systems and elements

Signal reflector

3-corner retroreflective

C359S530000, C359S572000, C359S569000

Reexamination Certificate

active

06974218

ABSTRACT:
A layer composite of plastic material forms a retroreflector and includes at least one transparent structure layer, a protective layer and a reflection layer enclosed at the common interface between the structure layer and the protection layer. A relief structure formed by substantially identically shaped three-dimensional structure elements is formed in the reflection layer. At their base surfaces the structure elements are of lateral dimensions in the range of between 1 μm and 100 μm. The structure elements have side faces which are covered by the reflection layer and which include an angle of inclination of 45°, with a free surface of the layer composite. The relief structure is additively superimposed with a microstructure in at least one surface element. The microstructure has a preferred direction and influences the quality of the reflection action of the layer composite. The retroreflector is suitable for the production of machine-readable optical markings.

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“Diffractive Optical Code for IC-Card Security,” Tompkin, et al.,Optical Security and Counterfeit Deterrence Techniques II, vol. 3973 (2000).

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