Electrical devices

H - Electricity – 01 – C

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Details

H01C 7/02 (2006.01) H01C 1/14 (2006.01) H01C 17/00 (2006.01)

Patent

CA 2192369

Electrical devices, particularly circuit protection devices, contain conductive polymer elements whose edges are formed by breaking the conductive polymer element, along a desired path, without the introduction of any solid body into the element. The resulting cohesive failure of the conductive polymer produces a distinctive fractured surface. One method of preparing such devices involves etching fracture channels in the electrodes of a plaque containing a PTC conductive polymer element sandwiched between metal foil electrodes, and then snapping the plaque along the fracture channels to form individual devices. The figure illustrates a circuit protection device made in this way.

Des dispositifs électriques, en particulier des dispositifs de protection de circuits, contiennent des éléments de polymères conducteurs dont les arêtes sont constituées par fracture de l'élément de polymère conducteur, selon un tracé voulu, sans introduction de corps solide dans l'élément. La rupture cohésive du polymère conducteur produit une surface fracturée distinctive. L'un des procédés de réalisation de ces dispositifs consiste à corroder des canaux de fracture dans les électrodes d'une plaque contenant un élément de polymère conducteur à coefficient de température positif, inséré entre des électrodes à film métallique, puis à briser la plaque le long des canaux de fracture afin de former des dispositifs individuels. La figure montre un dispositif de protection de circuits réalisé selon ce procédé.

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