Optical sensor with planar wall

G - Physics – 07 – D

Patent

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Details

G07D 7/00 (2006.01) G07D 7/12 (2006.01)

Patent

CA 2358709

An improved optical sensor for a banknote validator uses an aspherical lens having a planar wall as a combination radiation plug for a port in the pathway and a focusing arrangement. Emitters and receivers are closely positioned on a common support and generally located at the focal point of the lens. The radiation reflected by a banknote is focused and received by the receiver. The lens also serves to collimate the produced radiation of the emitters for scanning of the banknote.

L'invention concerne un capteur optique amélioré pour un validateur de billets de banques. Ce capteur utilise une lentille asphérique pourvue d'une paroi plane formant un dispositif d'obturation des rayonnements pour un orifice ménagé dans la trajectoire et un système de focalisation combinés. Les émetteurs et les récepteurs sont positionnés de manière rapprochée sur un support commun et sont généralement placés au niveau du point focal de la lentille. Les rayonnements réfléchis par un billet de banque sont focalisés et reçus par le récepteur. La lentille permet également de collimater le rayonnement produit par les émetteurs pour balayer le billet de banque.

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