US 11,654,710 B2
Security elements and methods of manufacture thereof
Brian Holmes, Basingstoke (GB)
Assigned to DE LA RUE INTERNATIONAL LIMITED, Hampshire (GB)
Appl. No. 17/40,393
Filed by DE LA RUE INTERNATIONAL LIMITED, Basingstoke (GB)
PCT Filed Mar. 22, 2019, PCT No. PCT/GB2019/050828
§ 371(c)(1), (2) Date Sep. 22, 2020,
PCT Pub. No. WO2019/180459, PCT Pub. Date Sep. 26, 2019.
Claims priority of application No. 1804629 (GB), filed on Mar. 22, 2018.
Prior Publication US 2021/0053380 A1, Feb. 25, 2021
Int. Cl. B42D 25/324 (2014.01); B42D 25/328 (2014.01); B42D 25/45 (2014.01); G02B 5/18 (2006.01); B42D 25/23 (2014.01); B42D 25/24 (2014.01); B42D 25/29 (2014.01); B42D 25/373 (2014.01)
CPC B42D 25/328 (2014.10) [B42D 25/324 (2014.10); B42D 25/45 (2014.10); G02B 5/1819 (2013.01); G02B 5/1847 (2013.01); G02B 5/1857 (2013.01); B42D 25/23 (2014.10); B42D 25/24 (2014.10); B42D 25/29 (2014.10); B42D 25/373 (2014.10)] 16 Claims
OG exemplary drawing
 
1. A security element comprising:
a first layer having a first surface coated in a reflection enhancing layer;
an array of image regions across the first surface, each image region comprising at least a first sub-region and a second sub-region, wherein the array of image regions comprises an array of elongate image regions, each elongate image region extending in a first direction along the first surface, the array of elongate image regions being arranged along a second direction along the first surface substantially perpendicular to the first direction along the first surface;
a first diffractive optically variable effect generating structure provided in or on the first surface across the first sub-regions, wherein the first diffractive optically variable effect generating structure is a dispersive structure; and
a second diffractive optically variable effect generating structure provided in or on the first surface across the second sub-regions, wherein the second diffractive optically variable effect generating structure is a dispersive structure;
wherein the first surface is arranged such that each first sub-region has a first average inclination and such that each second sub-region has a second average inclination different from the first average inclination,
wherein the first diffractive optically variable effect generating structure and the first average inclination provide that the first optically variable effect is exhibited across the first sub-regions at least at a first viewing angle and the second diffractive optically variable effect generating structure and the second average inclination provide that the second optically variable effect is exhibited across the second sub-regions at least at a second viewing angle different from the first viewing angle,
wherein the first average inclination differs from the second average inclination about an image region axis parallel with the first direction along the first surface, and
wherein the first and second diffractive optically variable effect generating structures are oriented such that diffractive elements of the first and second diffractive optically variable effect generating structures extend along respective directions that are at least 45° from the image region axis.