Security document and method for producing it
AssigneeGiesecke & Devrient GmbH
InventorWittich Kaule
Life of this patent
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Abstract
The invention relates to a security document, in particular a bank note, identity card or the like, provided with a magnetic security element. The security element preferably consists of a carrier foil having applied thereto a magnetic material whose coercivity is between 10 and 250 oersteds (Oe).
Claims19
A method for producing a security document comprising a security element, said security element comprising a layer of magnetic material, said magnetic material being a crystalline powdery material with a coercivity of between 10 and 250 Oe for a range of remanences, said range of remanences within 100 nWb/m.sup.2 to 1000 nWb/m.sup.2, said method comprising the steps of:
- mixing the crystalline powdery material with a binder to yield a magnetic ink;
- printing the magnetic ink at least in partial areas of a carrier;
- and
- combining the carrier with a security document.
A method for producing a security document comprising a security element comprising a vapor deposited layer or a sequence of vapor deposited layers of a magnetic material for automatic authenticity testing of the document, said magnetic material having a coercivity of between 10 and 250 Oe, said method comprising the steps of:
- vapor depositing a first layer of the magnetic material at least in partial areas of a carrier, said first layer having a first thickness;
- vapor depositing at least a second layer of the magnetic material onto the first layer, said second layer having a second thickness, wherein the first and second thickness add to a total thickness;
- and
- combining the carrier with the security document.
A security document comprising at least one security element comprising a layer of magnetic material for automatic testing of the document wherein said magnetic material has a single value of coercivity of between 10 and 250 Oe for a range of remanences.
A security document comprising at least one security element comprising a layer of magnetic material for automatic testing of the document wherein said magnetic material has a single value of coercivity of between 10 and 250 Oe for a range of remanences;
- wherein said range of remanences is within 100 nWb/m.sup.2 to 1000 nWb/m.sup.2 ;
- wherein the magnetic material is selected from the group consisting of iron, nickel and crystalline powdery materials;
- wherein said magnetic material is a crystalline powdery material which is mixed into a binder and printed;
- and wherein the layer of magnetic material comprises at least two single layers.
Dependencies are inferred from the claim text.