METHODS FOR MANUFACTURING SECURITY DOCUMENTS AND DEVICES

MA42894AInactive Publication Date: 2018-05-16DE LA RUE INTERNATIONAL LTD
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Patent Information

Application Number
MA42894
Authority / Receiving Office
MA · MA
Patent Type
Applications
Current Assignee / Owner
Priority Date
2016-07-11
Filing Date
2016-07-11
Publication Date
2018-05-16
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing security documents and devices lack advanced security features to prevent counterfeiting and tampering, particularly in the context of holograms and other optically variable devices, which are vulnerable to reproduction and manipulation.

Method used

The implementation of a network of primary focusing elements with multiple characteristics, such as microstructures and diffractive structures, to create a unique and complex pattern that is difficult to replicate, combined with a security thread and a micro-optical element to enhance security.

Benefits of technology

Enhances the security of documents and devices by making them highly resistant to counterfeiting and tampering, providing a unique and complex pattern that is challenging to reproduce.

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Abstract

A method for manufacturing a safety device, comprising: (a) forming a network of primary focusing elements on a first region of a focusing element support layer, by: (a) applying at least one transparent curable material to the focusing element support layer or to a molding tool carrying a surface relief over an area that includes at least the first region, the surface relief including parts corresponding to the primary focusing elements; (a) (ii) forming the transparent curable material(s) with the molding tool; and (a) (iii) curing the transparent curable material(s) so as to retain the surface relief in the first region;in which the surface relief further comprises a plurality of structures of greater depth than the height of the primary focusing elements such that the hardened transparent material(s) comprise a plurality of features exceeding the height of the primary focusing elements between the primary focusing elements of the lattice, in which the surface relief is configured such that more than one of the primary focusing elements of the lattice spaces each of the plurality of features among the following.
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Description

configured in such a way that more than one of the primary focusing elements of the network space each of the plurality of characteristics among the following.

Claims

DEMANDS 1. A method for manufacturing a safety device, consisting of: (a) form a network (20) of primary focusing elements (20a) on a first 5 region of a focusing element support layer (201), in: (a)(i) applying at least one transparent curable material (205) either to the support layer of the focusing element, or to a molding tool (221) bearing a surface relief (225) over an area which includes at least the first region, the surface relief (225) including parts corresponding to the primary focusing elements (20a); 10 (a)(ii) forming the transparent curable material(s) (205) using a tool molding (221); and in (a)(iii) hardening the transparent hardenable material(s) (205) so as to maintain the surface relief (225) in the first region; in which the surface relief (225) further comprises a plurality of structures (227) of a depth greater than the height of the primary focusing elements (20a), so that the or the hardened transparent materials (205) comprise a plurality of features (27) projecting above the height of the primary focusing elements (20a) between primary focusing elements (20a) of the grating, wherein the surface relief (225) is designed such that more than one of the primary focusing elements (20a) of the grating spaces each feature of the plurality of features (27) of the following, and wherein the features (27) projecting above the height of the primary focusing elements (20a) are arranged with a spacing of at least one feature for 50 primary focusing elements. 25 2. A method according to claim 1, wherein the features (27) projecting at the- above the height of the primary focusing elements (20a) are arranged with a spacing of at least one feature for 30 primary focusing elements, preferably for at least 10 primary focusing elements. 30 3. A method according to any one of the preceding claims, wherein the plurality of features (27) projecting collectively above the height of the elements of primary focus (20a) does not occupy more than 10% of the first region, preferably not more than 5%.

4. A method according to any one of the preceding claims, wherein each of the features (27) projecting above the height of the primary focusing elements (20a) is spaced from the next by at least 5 primary focusing elements, more preferably by at least 10 primary focusing elements.

5. A method according to any one of the preceding claims, wherein each of the features (27) projecting above the height of the primary focusing elements (20a) has a width not exceeding 10 times the diameter of the primary focusing element, more preferably not exceeding 5 times the diameter of the primary focusing element, more preferably not exceeding 3 times the diameter of the primary focusing element, better still approximately equal to the diameter of the focusing element.

6. A method according to any one of the preceding claims, wherein each of the features (27) projecting above the height of the primary focusing elements (20a) has a height of at least 5 pm (microns) greater than the height of the primary focusing elements, more preferably of at least 10 pm (microns) greater than the height of the primary focusing elements.

7. A method according to any one of the preceding claims, further consisting of: (b) provide an image array (30) located in a plane spaced from the array (20) of primary focusing elements (20a) by a distance substantially equal to the focal length of the primary focusing elements, such that the primary focusing elements present a substantially focused image of the image array.

8. Safety device comprising an array (20) of primary focusing elements (20a) formed of at least one hardenable transparent material (205) arranged through a first region of a focusing element support layer (201), the array (20) further comprising a plurality of features (27) projecting above the height of the focusing elements (20a), formed from at least one hardenable material (205), between the primary focusing elements (20a) of the array, more than one of the primary focusing elements (20a) of the array spacing each feature of the plurality of features (27) from the next, characterized in that the features are arranged with a spacing of at least one feature (27) for 50 primary focusing elements (20a).

9. Safety device according to claim 8, wherein the features (27) projecting above the height of the primary focusing elements (20a) are arranged with a spacing of at least one feature for 30 primary focusing elements, preferably for at least 10 primary focusing elements. 5 10. Safety device according to claim 8 or 9, wherein the plurality of features (27) projecting collectively above the height of the primary focusing elements (20a) do not occupy more than 10 5 / 5 of the first region, preferably not more than 5%.

11. Safety device according to any one of claims 8 to 10, wherein each of the 10 features (27) projecting above the height of the primary focusing elements (20a) are spaced from the next by at least 5 primary focusing elements, more preferably by at least 10 primary focusing elements.

12. Safety device according to claims 8 to 10, wherein each of the features (27) protrudes above the height of the focusing elements 15 primaries (20a) has a width not exceeding 10 times the diameter of the primary focusing element, more preferably not exceeding 5 times the diameter of the primary focusing element, more preferably not exceeding 3 times the diameter of the primary focusing element, better still approximately equal to the diameter of the focusing element. 20 13. Safety device according to any one of claims 8 to 12, wherein each of the features (27) projecting above the height of the primary focusing elements (20a) have a height of at least 5 pm (microns) greater than the height of the primary focusing elements, more preferably at least 10 pm (microns) greater than the height of the primary focusing elements. 2'5 14. Safety device according to any one of claims 8 to 13, characterized in that the surface of the focusing element network (20) is discovered.

15. Safety device according to any one of claims 8 to 14, further comprising an image array (30) located in a plane spaced from the focusing element array by a distance substantially equal to the focal length of the focusing elements, so that the focusing elements present a substantially focused image of the image array.