Article, especially valuable and security document, comprising a security feature
View Patent ↗A value or security document ( 2 ) contains a security feature ( 4 ) in the form of a film laser with an emitter layer ( 12 ) and preferably a protective layer ( 14 ). A spatial, periodic modulation ( 8 ), preferably of the surface of a substrate, permits fine adjustment of a laser wavelength within a range of possible wavelengths. This permits a coding of the security feature by different portions of different wavelengths.
1. A value and security document, comprising a security feature having a substrate, an emitter layer for stimulated optical emission and a periodic height modulation formed on a surface of the substrate.
2. A value and security document according to claim 1 , wherein the periodic modulation extends in a single direction.
3. A value and security document according to claim 1 , wherein the periodic modulation extends in two different directions.
4. A value and security document according to claim 3 wherein said two different directions extend at right angles to each other.
5. A value and security document according to claim 1 , wherein a reflecting layer is located between the substrate and the emitter layer.
6. A value and security document according to claim 1 , wherein the emitter layer has disposed thereon a protective layer with a lower refractive index compared with the emitter layer.
7. A value and security document according to claim 1 , wherein the emitter layer is equipped with at least one of optical absorbers, antioxidants, and radical traps.
8. A value and security document according to claim 1 , wherein the security feature comprises a coding, whereby the coding is formed by at least one of:
a) defined sites being assigned a state “laser active” or “laser inactive;”
b) defined sites being assigned a state “laser inactive” or “laser active with one of a predetermined number of wavelengths;” and
c) defined sites each being assigned their own wavelength from a number of possible wavelengths of the laser light or a state “laser inactive.”
9. A value and security document according to claim 8 , wherein the sites are disposed along a line.
10. A value and security document according to claim 9 , wherein the sites are disposed in two dimensional distribution.
11. A value and security document according to claim 8 , wherein separating elements are formed between the sites.
12. A value and security document according to claim 1 , wherein the security feature is formed as the substructure of another security feature.
13. A value and security document according to claim 12 wherein said another security feature is a hologram.
14. A value and security document according to claim 1 , wherein the security feature is incorporated into the object in the form of one or more prefabricated portions.
15. A value and security document according to claim 14 wherein said prefabricated portions are planchets
16. A value and security document according to claim 1 , wherein the security feature is provided on the object by means of screen printing or glued to the object as a prepared element.
17. A value and security document according to claim 1 , wherein the emitter layer has a protective layer disposed thereon that is equipped with at least one of optical absorbers, antioxidants and radical traps.