Abstract:
The invention relates to a security element (1), to a security document (2) having at least one security element (1), to a transfer film (3) having at least one security element (1), and to a method for producing a security element (1), wherein the security element has at least one layer (11) having an electrically controlled variable optical effect. According to the invention, the at least one layer (11) having an electrically controlled variable optical effect contains liquid crystals (12) that can be oriented in an electric field, and the layer (11) having an electrically controlled variable optical effect contains rod-like dye molecules (13), and the orientations of the longitudinal axes (14) of the rod-like dye molecules (13) can vary depending on the orientations of the longitudinal axes (16) of the spatially adjacent liquid crystals (12) that are orientable in the electric field, and/or wherein the liquid crystals (12) that are orientable in the electric field are such that the liquid crystals (12) that are orientable in the electric field act simultaneously as dye molecules.
Abstract:
The invention relates to a security element (2) comprising a first region (30) which is transparent in transmitted light. The security element (2) comprises a substrate (21) which in the first region (30) has one or more transmissive diffraction structures which, when seen in transmitted light, show one or more optical security features.
Abstract:
The invention relates to a security element (1). The security element (1) has a visible face, and a rear side lying opposite said face. The security element includes at least one luminous layer (2), which can emit light (20), and at least one mask layer (4), which is arranged in front of the at least one luminous layer (2) when looking at the security element (1) from the visible face. The at least one mask layer (4) has at least one opaque region (5) and at least two transparent openings (41, 42). The at least two transparent openings (41, 42) have a significantly higher degree of transmission than the at least one opaque region (5) with respect to the light emitted (20) by the at least one luminous layer (2), preferably a degree of transmission higher by at least 20%, with a degree of transmission higher by at least 50% being especially preferred.
Abstract:
The invention relates to a multi-layered foil body (1) for marking a security document, in particular a banknote. The foil body (1) has at least one colour filter layer (2) and at least one change layer (4) with an electrically controllable transmittance and/or an electrically controllable colour. The change layer (4) can have liquid crystals (15), which are alignable in an electric field, such as a PDLC layer. The foil body (1) preferably comprises two differently coloured colour filter layers (2, 3) and a change layer (4) which is disposed therebetween. The invention furthermore relates to a security element (10) having at least one aforementioned foil body and a piezoelectric energy source (8) which controls the change layer (4).
Abstract:
The invention relates to a method for producing a multilayer body, having the following steps: a) providing a substrate film with a replication layer; b) molding a surface relief into a surface of the replication layer, said surface relief having the appearance of a three-dimensional free-form surface to the observer and being made in particular of lens-shaped structures that produce a magnifying, minifying, or distorting effect; c) applying a first metal layer onto the replication layer surface which forms the surface relief; d) wet-chemically applying an at least partly transparent spacer layer onto the metal layer; and e) applying a second metal layer onto the spacer layer. The invention further relates to a multilayer body produced in such a manner.
Abstract:
The invention relates to a multilayer body (1, 2, 3) and a method for producing a security element. The multilayer body has a metal layer (21). An optically active surface relief is formed on at least some regions of a first surface of the metal layer (21), said first surface facing the top of the multilayer body or forming the top of the multilayer body, and/or a second surface of the metal layer (21), said second surface facing the bottom of the multilayer body or forming the bottom of the multilayer body. The surface relief is formed by a first relief structure (61) in at least one first region (31 to 39) of the multilayer body. The first relief structure (61) has a sequence of elevations (612) and depressions (614) in at least one direction (617) determined by a corresponding azimuth angle, said elevations (612) successively following one another with a period P which is smaller than a visible light wavelength. The minima of the depressions (614) lie on a base surface, and the first relief structure (61) has a relief depth t which is determined by the distance between the maxima of the elevations (612) of the first relief structure (61) and the base surface in a direction perpendicular to the base surface. The profile shape and/or the relief depth t of the first relief structure (61) is selected such that the coloration of the light (52, 53) which is incident on the first region (31 to 39) at at least one first angle of incidence and which is directly reflected by the metal layer (21) in the first region or directly transmitted through the metal layer is changed, in particular by means of the plasmon resonance of the metal layer together with the incident light.