Security substrates

摘要

The security substrate includes an at least partially light transmitting carrier supporting a security feature and includes at least first and second layers, at least one of which covers an area which is less than a full surface area of the carrier and which at least partially overlaps the other layer. The layers have substantially the same color and texture, and the reflective contrast ratio of the overlapping areas and the non-over lapping areas is less than 20% and the transmissive contrast ratio of the overlapping areas and the non-overlapping areas is greater than 3%.

主权项

1. A security substrate, said substrate comprising:
an at least partially light transmitting carrier supporting a security feature, said security feature comprising a first and a second layer and a metallic and a demetallised region at least partially superimposed with the first and second layers, at least one of said first and second layers covering an area which is less than a full surface area of the carrier and which at least partially overlaps the other layer, wherein the first and second layers have substantially the same colour and texture, and the reflective contrast ratio (expressed as a percentage) of the overlapping areas and the non-overlapping areas is less than 20% and the transmissive contrast ratio (expressed as a percentage) of the overlapping areas and the non-overlapping areas is greater than 3%, the contrast ratios of each of the areas defined by the first and second layers being selected in combination with one another such that; when the security substrate is viewed in reflected light, the first and second layers are indiscernible from each other and have the appearance of a single homogenous area; and when the substrate is viewed in transmitted light, the first and second layers are clearly distinguishable from each other.