G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/28 (2006.01) G06K 19/14 (2006.01) G07D 7/12 (2006.01)
Patent
CA 2359666
Optical filters (1) designed in pairs, which are essentially colourless in their individual general appearance but desined to take on a strong colouration when viewed together in transmission, said filters being particularly useful for identification of counterfeit articles. The optical filters (1) utilise resonantly-coupled Fabry-Perot etalons of an asymmetric design. The filters (1) are configured such that one of the Fabry-Perot cavities within the filter incorporates an additional multiple quarter wave thickness layer (20), said additional layer having a contrasting refractive index to that of the cavity spacer.
L'invention concerne des filtres optiques (1) allant par paires, d'aspect sensiblement incolore mais conçus pour apparaître fortement colorés, observés ensemble en transparence. Ces filtres conviennent particulièrement dans l'identification d'articles de contrefaçon. Ces filtres optiques (1) utilisent des étalons Fabry-Pérot couplés résonnants et asymétriques. Les filtres (1) sont configurés de telle manière qu'une des cavités de Fabry-Pérot du filtre intègre une couche supplémentaire (20) dont l'épaisseur est un multiple d'un quart de longueur d'onde, cette couche ayant un indice de réfraction différent de celui de l'élément de séparation de la cavité.
Fetherstonhaugh & Co.
Qinetiq Limited
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