Security document with security features in the form of luminescing substances
First Claim
1. Security document with security features comprising:
- a substrate material; and
a luminescing substance combined with said carrier material, said luminescing substance having a known excitation spectrum and a known emission spectrum wherein at least a portion of said excitation spectrum and at least a portion of said emission spectrum are contained in a narrow band of wavelengths and at least a portion of said excitation spectrum overlaps at least a portion of said emission spectrum in said narrow wavelength band whereby said luminescing substance operates in a quasi-resonant mode.
1 Assignment
0 Petitions
Accused Products
Abstract
Security paper with narrow band luminescing authenticity characteristics which can only be excited in substantially the same wavelength region in which it also emits. With these authenticity characteristics therefore the authenticity signal is overlapped or covered by the test signal of several orders of magnitude stronger. The authenticity of the security papers cannot accordingly be tested with the normal processes or devices for determining of luminescence. The test devices used take advantage of the decay behavior of the luminescence emission for detection. The authenticity characteristics can be added to the paper material, the printing ink used, further mottling fibres or security threads.
-
Citations
16 Claims
-
1. Security document with security features comprising:
-
a substrate material; and a luminescing substance combined with said carrier material, said luminescing substance having a known excitation spectrum and a known emission spectrum wherein at least a portion of said excitation spectrum and at least a portion of said emission spectrum are contained in a narrow band of wavelengths and at least a portion of said excitation spectrum overlaps at least a portion of said emission spectrum in said narrow wavelength band whereby said luminescing substance operates in a quasi-resonant mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification