Light transmissive cards with suppression of UV-induced fluorescence
First Claim
1. A visible light transmissive card, comprising:
- a UV-excitable security indicia;
a coextensive card layer comprising a component that fluoresces under UV light; and
a first UV blocking material disposed between the security indicia and the coextensive card layer.
1 Assignment
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Accused Products
Abstract
A visible light transmissive card includes a security indicia that fluoresces under UV light. The card also includes at least one IR filter. The IR filter and/or another card layer that is substantially coextensive with a front card surface includes a component that also fluoresces under UV light. A UV blocking material is disposed between the security indicia and the UV-excitable component of the IR filter or other layer, so that the security indicia is clearly visible when the card is exposed to UV light. In some embodiments the UV blocking material is patterned to define (in combination with the fluorescing IR filter or another coextensive card layer) a secondary security indicia, which may be used in addition to or in place of the original security indicia. IR filter laminates used in the construction of such cards are also disclosed.
74 Citations
22 Claims
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1. A visible light transmissive card, comprising:
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a UV-excitable security indicia;
a coextensive card layer comprising a component that fluoresces under UV light; and
a first UV blocking material disposed between the security indicia and the coextensive card layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A visible light transmissive card having an outer card surface, comprising:
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a coextensive card layer comprising a component that fluoresces under UV light; and
a patterned UV blocking material disposed between the coextensive card layer and the outer card surface to define a security indicia that becomes visible when the card is exposed to UV light. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An IR filter laminate suitable for use in making light transmissive cards, comprising:
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an IR filter comprising a component that fluoresces under UV light;
first and second outer polymer layers; and
first and second adhesive layers bonding the IR filter to the first and second outer polymer layers respectively;
wherein at least one layer of the laminate comprises a component that fluoresces under UV light; and
wherein the laminate further includes a UV blocking material disposed to reduce fluorescing of the component when the filter laminate is exposed to UV light. - View Dependent Claims (20, 21, 22)
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Specification