Emerging security features for identification documents
First Claim
1. An identification document comprising at least one of a photographic representation of a bearer of said identification document or indicia provided on the document, said identification document further comprising a security feature including:
- a first set of elements provided on a surface of the identification document by a first ink, the first ink including a first emission decay rate;
a second set of elements provided on the surface of the identification document by a second ink, the second ink including a second emission decay rate, wherein the first emission decay rate is relatively shorter than the second emission decay rate; and
whereinthe first set of elements and second set of elements are arranged on the surface of the identification document so as to collectively convey a first pattern when the first ink and the second ink are excited by non-visible light, wherein the second set of elements convey a second pattern that becomes distinguishable as emissions from the first ink decay but before the emissions from the second ink are extinguished.
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Abstract
The present invention provides an emerging security or authentication feature for identification documents and other objects. The security feature is constructed using two differently emission-decaying inks. The inks are arranged so as to convey a first pattern when they are both exited. A second pattern emerges as a first and more rapidly decaying ink decays, but while a second and relatively longer decaying ink still provides emissions. The second pattern can be alphanumeric characters, a barcode, a pattern that will yield a predictable frequency domain representation, a digital watermark, etc. In one implementation, the first pattern is a first machine-readable code and the second pattern is a second, different machine-readable code.
236 Citations
31 Claims
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1. An identification document comprising at least one of a photographic representation of a bearer of said identification document or indicia provided on the document, said identification document further comprising a security feature including:
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a first set of elements provided on a surface of the identification document by a first ink, the first ink including a first emission decay rate; a second set of elements provided on the surface of the identification document by a second ink, the second ink including a second emission decay rate, wherein the first emission decay rate is relatively shorter than the second emission decay rate; and
whereinthe first set of elements and second set of elements are arranged on the surface of the identification document so as to collectively convey a first pattern when the first ink and the second ink are excited by non-visible light, wherein the second set of elements convey a second pattern that becomes distinguishable as emissions from the first ink decay but before the emissions from the second ink are extinguished. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method to detect a characteristic of a security feature provided on an identification document, the security feature comprising a first set of elements printed on a surface of the identification document with a first ink and a second set of elements printed on the surface of the identification document with a second ink, the second ink comprising an emission decay time that is longer than an emission decay time of the first ink, said method comprising:
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exciting the first ink and the second ink; and observing at least a characteristic of the security feature after emissions from the first ink fall to a first level and before emissions from the second ink fall to a second level. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A method of providing a security feature for a physical object, said method comprising:
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arranging a first set of elements on a surface of the physical object via a first ink, the first ink comprising a first emission decay rate; and arranging a second set of elements on a surface of the physical object via a second ink, the the second ink comprising a second emission decay rate, wherein the second emission decay rate is relatively longer than the first emission decay rate, and wherein the first set of elements are arranged so as to cooperate with the second set of elements to convey a first pattern formed by emissions of the first ink and the second ink, and the second set of elements are arranged so as convey a second pattern which becomes distinguishable after emissions from the first ink reach a first level but before emissions from the second ink are extinguished. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. An identification document comprising at least one of a photographic representation of a bearer of said identification document or indicia provided thereon, said identification document further comprising a security feature including:
- i) a first set of elements provided on a surface of the identification document by a first ink, the first ink including a first emission decay rate;
ii) a second set of elements provided on the surface of the identification document by a second ink, the second ink including a second emission decay rate, wherein the first emission decay rate is relatively shorter than the second emission decay rate, and wherein the first set of elements and second set of elements are arranged on the surface of the identification document so as to collectively convey a first pattern when the first ink and the second ink are excited by a non-visible light, with the second set of elements conveying a second pattern that becomes distinguishable as emissions from the first ink decay but before the emissions from the second ink are extinguished, said document further comprising a machine-readable code that is detectable with visible light scanning of the document, the machine readable code conveying at least one of;
i) the presence of the second pattern;
ii) a frequency or range of frequencies of the non-visible light;
or information corresponding to, or being redundant with, the first pattern or second pattern.
- i) a first set of elements provided on a surface of the identification document by a first ink, the first ink including a first emission decay rate;
Specification