Patent ID: 9731539
Date: 2017-08-15
CPC Classifications: B41M,B42D,G03C,G03F

Claim:
1. A security device, comprising: an at least semi-transparent layer exhibiting a first pattern of integral regions having a raised surface profile relative to intervening regions of the layer, the first pattern comprising raised regions each having at least two flank surfaces that are non-parallel to a plane of the device, and the material of the raised regions being of high optical density relative to the material of the intervening regions of the layer; and a colour layer arranged to follow the contours of the integral regions and exhibiting a second pattern comprising elements of at least two different colours, the second pattern being configured such that (i) at least two of the flank surfaces of each raised region exhibit different colour appearances and (ii) at least elements of the second pattern corresponding to the intervening regions of the first pattern are semi-transparent; wherein the first and second patterns at least partially overlap one another and are configured such that: