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1. (WO2018142128) METHOD OF FORMING A SECURITY DEVICE

Pub. No.:    WO/2018/142128    International Application No.:    PCT/GB2018/050280
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Thu Feb 01 00:59:59 CET 2018
IPC: B42D 25/435
B42D 25/44
B42D 25/425
B42D 25/41
B42D 25/324
B42D 25/328
B42D 25/351
B42D 25/355
B42D 25/364
B42D 25/373
B42D 25/378
B42D 25/23
B42D 25/24
B42D 25/29
Applicants: DE LA RUE INTERNATIONAL LIMITED
Inventors: LOCKE, Rebecca
GODFREY, John
Title: METHOD OF FORMING A SECURITY DEVICE
Abstract:
A method of forming a security device comprising a colour shifting element, wherein the colour shifting element provides a first optical effect, the method comprising; providing a light control layer over at least a part of the colour shifting element, the light control layer comprising a functional region and at least one non-functional region, wherein the functional region comprises a surface relief adapted to modify the angle of light from the colour shifting element so as to generate a second optical effect different from the first optical effect, and wherein the non-functional region does not substantially modify the angle of light from the colour shifting element, and; wherein the at least one non-functional region is not discernible to the naked eye.