IMPROVEMENTS IN SECURITY DOCUMENTS

摘要

A security document including: a substrate formed from a transparent or translucent material; a security device provided on one side of the substrate formed from an embossed radiation curable ink, at least one opacifying layer applied to said one side of the substrate to cover the embossed security device; at least one opacifying layer applied to the opposite side of the substrate but omitted in the region of the embossed security device; wherein the embossed security device is hidden from one side of the security document by the at least one opacifying layer covering the security device, but visible from said opposite side of the security document through a half-window formed by the region in which the at least one opacifying layer on the opposite side of the substrate is omitted; and wherein the security device includes at least two different embossed relief structures embossed into the same side of the radiation cured ink, each forming a different security element integrated within the same area to form a composite security device.