Multi-luminescent security element and value or security product containing said security element

Patent metadata

Field	Value
Publication number	US-11214734-B2
Application number	US-201414783222-A
Country	US
Kind code	B2
Filing date	Apr 2, 2014
Priority date	Apr 8, 2013
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

In order to increase the security of value or security documents 100 , a multi-luminescent security element 400 is provided which contains at least one first luminescence means 510 and at least one second luminescence means 520 . The first luminescence means 510 can be excited under first excitation conditions Sp- 1 for the purpose of luminescence, and the second luminescence means 520 can be excited under second excitation conditions Sp- 2 for the purpose of luminescence, said second excitation conditions Sp- 2 differing from the first excitation conditions Sp- 1 . The multi-luminescent security element 400 is additionally equipped with at least one absorber means 600 which prevents an excitation of the at least one first luminescence means 510 under the second excitation conditions Sp- 2 for the purpose of luminescence.

First claim

The invention claimed is:

1. A multi-luminescent security element comprising:
(a) a first luminescence means having a first excitation spectrum;
(b) a second luminescence means having a second excitation spectrum, wherein the second excitation spectrum does not completely overlap with the first excitation spectrum; and
(c) an absorber means that absorbs electromagnetic radiation at the second excitation spectrum but does not absorb electromagnetic radiation having a wavelength in a wavelength range within the first excitation spectrum that does not fall within the second excitation spectrum;
(d) wherein the first luminescence means is excitable by radiation of both the first excitation spectrum and the second excitation spectrum, and wherein in said security element said absorber means absorbs radiation of the second excitation spectrum by which the first luminescence means is excitable by, to prevent excitation of said first luminescence means by radiation of the second excitation spectrum such that said first luminescence means is only excitable by the radiation having a wavelength having a wavelength within the first excitation spectrum that does not fall within the second excitation spectrum, and wherein the second excitation spectrum, and wherein the second luminescence means is excitable by radiation of the second excitation spectrum.

2. The security element of claim 1 , further comprising two element volume areas spatially separate from one another, wherein the first luminescence means is contained in a first element volume area and the second luminescence means is contained in a second element volume area.

3. The security element of claim 2 , wherein the first element volume area comprises the absorber means.

4. The security element of claim 2 , wherein the first element area is surrounded by a shielding area comprising the absorber means.

5. The security element of claim 1 , further comprising an adhesive.

6. The security element of claim 1 , further comprising a filament comprising at least two element areas, the element areas being separate from one another in the longitudinal direction of the filament and/or arranged concentric to one another.

7. The security element of claim 1 , further comprising (i) two filaments connected to one another or (ii) a filament and an adhesive area wherein an element area is formed by at least some of the filament(s) and/or adhesive area.

8. The security element of claim 1 , wherein the first excitation spectrum is from 315 to 380 nm and the second excitation spectrum includes one or both of 200 to 280 nm and 280 to 315 nm.

9. A value or security product comprising the security element of claim 1 .

10. The security element of claim 1 , wherein the first luminescence means is present in a first volume area and the absorber means is present in the first volume area and/or completely surrounds the first volume area, thus preventing the excitation of the first luminescence means when the security element is excited with radiation having a wavelength within the second excitation spectrum.

11. The security element of claim 10 , wherein the second luminescence means is present in a second volume area that does not contain the absorber means and is not completely surrounded by the absorber means.

Assignees

• Bundesdruckerei Gmbh

Inventors

• Kunath Christian
• Krüger Per
• Mombrée Alexander
• Von Czapiewski Christoph

Classifications

• B42D25/23

  Identity cards · CPC title

• C09J2203/338

  as tamper-evident tape or label · CPC title

• B42D25/387

  absorbing or reflecting ultraviolet light · CPC title

• D21H21/48

  Elements suited for physical verification, e.g. by irradiation · CPC title

• D21H21/40

  Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper (watermarking B41M3/10, D21F1/44; security printing B41M3/14; securities or banknotes characterised by colour effects B42D25/29, B42D25/30; testing paper currency or valuable papers for genuineness G07D7/00) · CPC title