Visually identifiable optical element

B - Operations – Transporting – 42 – D

Patent

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Details

B42D 15/10 (2006.01) G02B 5/02 (2006.01) B41M 3/14 (2006.01)

Patent

CA 2199503

So that a visually identifiable optical element, in particular a security element for value-bearing documents, for example banknotes, credit cards, passes or cheque documents, or other articles to be safeguarded, comprising a carrier with a diffusely reflecting visible surface and a metallisation which is applied in a region-wise manner to the visible surface of the carrier and which has a surface that appears metallically shiny at a glancing angle is improved in such a way that an article provided with the element is even more effectively protected from forgery than is possible with known optical elements, it is proposed that the optical element is so designed that the visible surface of the carrier has two carrier regions with different levels of and in particular diffuse reflectivity for light, wherein a respective sub-region or a plurality of sub-regions of each of the two carrier regions is or are metallised, and that the reflectivity of the metallisation in viewing directions outside a glancing angle range is less than the reflectivity of the carrier region with the higher level of reflectivity or substantially corresponds to same and is greater than the reflectivity of the carrier region with the lower level of reflectivity or substantially corresponds to same.

Un élément optique identifiable, notamment un élément de sécurité pour papiers valeurs, par exemple des billets de banque, des cartes de crédit, des pièces d'identité ou des chèques, ou d'autres objets à sécuriser, comprend un substrat avec une surface visible de réflexion diffuse et une couche de métallisation appliquée sur certaines parties de la surface visible (12, 34) du substrat (10, 28, 36). Observée d'un certain angle, cette couche de métallisation présente une surface d'apparence métallique brillante. Afin d'améliorer un tel élément optique de façon à protéger l'objet qui en est pourvu de manière encore plus efficace que les éléments optiques connus, deux zones (14, 16, 30, 32, 40, 42) de la surface visible (12, 34) du substrat de l'élément optique ont des réflectivités, notamment diffuses, d'intensités diverses. Une partie (18, 24, 26) ou plusieurs parties (38) de chacune des deux zones (14, 16, 30, 32, 40, 42) du substrat sont métallisées. Observées d'un angle extérieur à une plage angulaire donnée, les couches demétallisation appliquées sur ces parties du substrat ont une réflectivité inférieure ou sensiblement égale à celle de la zone du substrat la plus réfléchissante et supérieure ou sensiblement égale à celle de la zone du substrat la moins réfléchissante.

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