Identification documents with enhanced security
First Claim
Patent Images
1. A method of producing a security document, comprising:
- providing a specific security document having a document surface with first information unique to the specific security document formed thereon;
dividing the first information into a plurality of segments, each segment based on a different portion of the first information; and
for each segment, forming a diffraction grating layer, each diffraction grating layer having an axis of diffraction that is different from the other diffraction grating layers to form a multi-layered diffractive optically variable image device on the security document, and printing the diffractive optically variable image device on the document surface.
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Abstract
An identification document having enhanced security and replication deterrence, while providing a simple low cost solution to other verification and authentication technologies. In one implementation, the document is provided with a multi-layer, multi-axis diffractive optical variable image device (DOVID) that is based on specific data or information on the document. The result is that the DOVID is directly tied to data or information that is specific to the document. This DOVID security feature is verifiable by the human eye so that no high levels of technology are necessary to verify authenticity. In addition, this DOVID security feature has enhanced tamper detection.
26 Citations
10 Claims
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1. A method of producing a security document, comprising:
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providing a specific security document having a document surface with first information unique to the specific security document formed thereon; dividing the first information into a plurality of segments, each segment based on a different portion of the first information; and for each segment, forming a diffraction grating layer, each diffraction grating layer having an axis of diffraction that is different from the other diffraction grating layers to form a multi-layered diffractive optically variable image device on the security document, and printing the diffractive optically variable image device on the document surface. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of producing a security document, comprising:
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providing a specific security document having a document surface with first information unique to the specific security document formed thereon; dividing the first information into a plurality of segments, each segment based on a different portion of the first information; and for each segment, forming a diffraction grating layer, each diffraction grating layer having an axis of diffraction that is different from the other diffraction grating layers to form a multi-layered diffractive optically variable image device on the security document, and printing the first information that is segmented onto the document, and forming each diffraction grating layer comprises printing each diffraction grating layer. - View Dependent Claims (9)
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10. A method of producing a security document, comprising:
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providing a specific security document having a document surface with first information unique to the specific security document formed thereon; dividing the first information into a plurality of segments, each segment based on a different portion of the first information, and each segment comprises a separate range of pixel intensities of the first information; and for each segment, forming a diffraction grating layer, each diffraction grating layer having an axis of diffraction that is different from the other diffraction grating layers to form a multi-layered diffractive optically variable image device on the security document.
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Specification