Patent ID: 11879083
Assignee: BUNDESDRUCKEREI GMBH
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC C  B  D | IPC B  C  D

Claim 0:
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, such that a non-overlapping part of the first excitation spectrum exists, that does not overlap with the second excitation spectrum; and
(c) an absorber means that absorbs electromagnetic radiation at the second excitation spectrum but does not absorb electromagnetic radiation in a subrange of the non-overlapping part of the first 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, to prevent excitation of said first luminescence means by radiation of the second excitation spectrum such that said first luminescence means is excitable by the radiation of said subrange of the non-overlapping part of the first excitation spectrum, and wherein the second luminescence means is excitable by radiation of the second excitation spectrum.