Security Documents with Personalised Images and Methods of Manufacture
1 Assignment
0 Petitions
Accused Products
Abstract
A method of producing a personalized security document or article includes providing a substrate which is transparent at least to visible light. A diffractive optical microstructure is formed in a substantially opaque layer disposed on a surface of the substrate. The diffractive structure comprises a plurality of apertures formed in the opaque layer, such that when the structure is suitably illuminated, for example by a beam of collimated light, a projected image is generated which is unique to a particular individual. Also, personalized security documents or articles made in accordance with the method.
12 Citations
61 Claims
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1-41. -41. (canceled)
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42. A method of producing a personalised security document or article, including the steps of:
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providing a substrate which is transparent at least to visible light; and forming a diffractive optical microstructure comprising a plurality of apertures formed in a substantially opaque layer disposed on a surface of the substrate, wherein the diffractive optical microstructure is formed such that when suitably illuminated a projected image is generated which is unique to a particular individual. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A personalised security document or article which includes:
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a substrate which is transparent at least to visible light; and a diffractive optical microstructure comprising a plurality of apertures formed in a substantially opaque layer disposed on a surface of the substrate, wherein the diffractive optical microstructure is formed such that when suitably illuminated an image is generated which is unique to a particular individual.
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57. A method of producing a security document or article including a substrate transparent to at least visible light and a diffractive optical microstructure, the method including the steps of:
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representing the diffractive optical microstructure as a plurality of narrow tracks, and forming the diffractive optical microstructure in a substantially opaque layer disposed on a surface of the substrate, by forming apertures in said layer in accordance with the plurality of narrow tracks.
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58. A method of producing a security document or article including a substrate transparent to at least visible light and a diffractive optical microstructure, the method including the steps of:
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representing the diffractive optical microstructure as a tiled array of square or rectangular sub-regions; and forming the diffractive optical microstructure in a substantially opaque layer disposed on a surface of the substrate by forming apertures in said layer corresponding with said array of square or rectangular sub-regions.
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59. A method of producing a security document or article including a substrate transparent to at least visible light and a diffractive optical microstructure, the method including the steps of:
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representing the diffractive optical microstructure as a two-dimensional array of discrete elements; and forming the diffractive optical microstructure by ablation of apertures in a substantially opaque layer disposed on a surface of the substrate, wherein the step of forming the diffractive optical microstructure includes performing laser ablation of the substantially opaque layer by directing a laser beam onto said layer in a pattern corresponding with the array of discrete elements using a micro-mirror array.
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60. A method of producing a security document or article including a substrate transparent to at least visible light and a diffractive optical microstructure, wherein the diffractive optical microstructure is formed by mechanical ablation of a substantially opaque layer formed on a surface of the substrate.
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61. A method of producing a security document or article including a substrate transparent to at least visible light and a diffractive optical microstructure, wherein the diffractive optical microstructure is formed by electrochemical machining of a substantially opaque metallic layer formed on a surface of the substrate.
Specification