Security document with holographic foil and printed machine-readable markings
A security document has a substrate ( 1 ) with a foil element ( 6 ) applied to it. The foil element ( 6 ) includes a security feature, such as a diffractive structure ( 12 ), for example a hologram. To easily detect a removal of the foil element ( 6 ) using conventional detection devices, markings ( 4, 14, 15 ) intersecting with the foil element ( 6 ) are printed onto the top surface ( 7 ) of the foil element ( 6 ), the bottom surface ( 8 ) of the foil element ( 6 ), or onto the substrate ( 1 ), thus that they are removed together with the foil element ( 6 ).
1. A security document comprising
a substrate,
a foil element comprising a security feature, wherein said foil element has a first surface facing away from said substrate and a second surface attached to said substrate,
printed machine-readable markings between said second surface and said substrate, wherein said markings abut said substrate,
wherein said markings intersect at least partially with said foil element,
wherein at least part of said markings are printed onto said substrate such that there is a direct contact between the at least part of said markings and said substrate, wherein, for said part of said markings printed onto said substrate, an adhesion of said markings to said substrate is weaker than an adhesion of said markings to said foil element.
2. The security document of claim 1 , wherein at least part of said markings are machine detectable through said foil element.
3. The security document of claim 1 , wherein at least part of said markings comprises a magnetic dye.
4. The security document of claim 1 , wherein at least part of said markings comprises a fluorescent ink.
5. The security document of claim 1 , wherein at least part of said markings is invisible when viewed in the wavelengths visible to a human eye.
6. The security document of claim 1 , wherein at least part of said markings comprises an infrared absorbing dye.
7. The security document of claim 1 , wherein said security feature comprises an optically variable device.
8. The security document of claim 1 , wherein at least part of said markings comprises an electrically conductive layer.
9. The security document of claim 8 , wherein said security document comprises a resonant circuit and wherein said conductive layer forms at least part of said resonant circuit.
10. The security document of claim 1 wherein said security document is selected from the group consisting of banknotes, passports, checks, stock certificates, tickets, credit cards, ID cards, good certificates, stamps, vouchers, shares, driving licenses, resident permits, birth certificates and insurance certificates.
11. The security device of claim 7 where said optically variable device is a diffractive structure or an optical thin-film element, or an optical waveguide.
12. The security document according to claim 1 , wherein the security document comprises an adhesive layer which attaches the second surface of the foil element to the substrate with a top surface of the adhesive layer contacting the second surface of foil element and a bottom surface of the adhesive layer contacting a top surface of the substrate, the markings being disposed along the bottom surface of the adhesive layer.
13. A method for manufacturing a security document, comprising the steps of:
providing a substrate;
printing markings onto said substrate such that there is a direct contact between the markings and said substrate; and
after printing said markings onto said substrate, applying a foil element comprising a security feature to said substrate, wherein said substrate markings intersect at least partially with said foil element and wherein, after applying said foil element to said substrate, an adhesion of said markings to said substrate is weaker than an adhesion of said markings to said foil element.
14. The method of claim 13 , wherein said foil has a first surface that is oriented away from said substrate and a second surface that is oriented to be adhered to said substrate and at least part of said markings is printed onto said second surface prior to attaching said foil element to said substrate.
15. The method of claim 14 , wherein said foil element comprises an adhesive layer having a first surface oriented towards the foil and a second surface oriented towards the substrate and wherein at least part of said markings is printed onto a second surface of said adhesive layer.
16. The method according to claim 13 wherein the foil element has a first surface that is oriented away from the substrate and a second surface that is oriented toward the substrate, and the foil element is applied to said substrate with an adhesive that forms an adhesive layer which attaches the second surface of the foil element to the substrate with a top surface of the adhesive layer contacting the second surface of the foil element and a bottom surface of the adhesive layer contacting a top surface of the substrate, the markings being disposed along the bottom surface of the adhesive layer.
17. A method for automatically verifying the authenticity of the security document of claim 4 , comprising the step of checking for a presence of said markings in the region of said foil element by means of a sensor device.
18. The method of claim 17 , comprising the step of checking for said markings arranged between said foil element and said substrate by performing a measurement through said foil element.