Diffractive surface pattern

G - Physics – 06 – K

Patent

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Details

G06K 19/16 (2006.01) B42D 15/10 (2006.01)

Patent

CA 2292594

According to the invention, a surface pattern (1) has N visually recognisable patterns consisting of diffractionally effective, microscopically fine relief structures or flat reflective surfaces, or comprising absorbent or dispersive structures. The N patterns together contain at least one common independent surface element (11). Said surface element (11) is divided into surface parts, said surface parts being arranged in a predetermined structure which is independent of the N patterns. Said arrangement of the surface parts is not visible to the naked eye. Each surface part is covered with an individual, microscopically fine diffraction structure or alternatively, a structure which has an absorbent or dispersive property or which is a flat reflective surface. The relief structures, diffraction structures and other structures are embedded in a plastic laminate (20) and the optical effect of said structures can be increased with a reflective layer (21). The surface pattern (1) is applied to a document (2) as a security element and enables said document to be recognised by machine in a reading device.

L'invention concerne un motif de surface (1) présentant N motifs reconnaissables visuellement, qui sont constitués de structures en relief microscopiquement fines, ayant un effet optique de diffraction, de surfaces réfléchissantes planes, ou bien qui comprennent des structures absorbantes ou dispersantes. Les N motifs contiennent un ensemble au moins un élément de surface (11) commun indépendant. Cet élément de surface (11) est divisé en parties de surface dont l'agencement est structuré de façon prédéfinie, est indépendant des N motifs et ne peut pas être reconnu à l'oeil nu. Chaque partie de surface est pourvue d'une seule structure de diffraction microscopiquement fine ou d'une structure qui possède une caractéristique d'absorption ou de diffraction ou bien qui est un miroir plan. Les structures de relief, les structures de diffraction et les autres structures sont incorporées à un stratifié (20) en matière plastique et leur efficacité optique peut être renforcée par une couche réfléchissante (21). Le motif de surface (1) est appliqué sur un document (2) en tant qu'élément de sécurité et permet une identification par machine du document (2), dans un appareil de lecture.

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