Abstract:
In one embodiment a varistor may include a ceramic body. The varistor may further comprise a multilayer coating disposed around the ceramic body. The multilayer coating may include a first layer comprising a phenolic material or a silicone material; and a second layer adjacent the first layer, the second layer comprising a high dielectric strength coating.
Abstract:
Procédé de modification de la valeur d'une résistance électrique (30), comportant un matériau ferromagnétique (31) possédant une première direction d'aimantation, comprenant les étapes suivantes: a)éclairement par un premier faisceau LASER (14) d'une première zone (32) du matériau ferromagnétique (31), de sorte que cette zone soit chauffée à une température égale ou supérieure à la température de Curie du matériau ferromagnétique (31); b)application dans la première zone(32) d'un champ magnétique de direction opposée à la première direction d'aimantation du matériau ferromagnétique (31); c)diminution de l'énergie apportée par le premier faisceau LASER (14) à la première zone (32) afin de permettre le refroidissement de la première zone pour former un premier domaine magnétique contrôlé (36C).
Abstract:
Terminating the ends of passive electronic components entails applying a laser-ablative coating (70) to each of the opposed major surfaces (14 and 16; 36 and 38) of a substrate (10 and 34). A UV laser beam having a spot size and an energy distribution sufficient to remove the laser-ablative coating from multiple selected regions of the major surfaces is directed for incidence on the substrate. Relative motion between the UV laser beam and substrate effects removal of sufficient amounts of laser-ablative coating to expose the multiple selected regions of the opposed major surfaces. The substrate is then broken into multiple rowbars (48 and 50), each of which includes side margins (60 and 62) along which are positioned different spatially aligned pairs of the selected regions of the opposed major surfaces. An electrically conductive material is applied to the side margins to form electrically conductive interconnects (56 and 58) between each spatially aligned pair of the selected regions.
Abstract:
A method for tuning a resistance v. temperature profile of a surface mountable polymeric PTC device for use as an overtemperature protection device. The method includes preparing a laminate comprising a conductive polymer composite sandwiched between metal foil electrodes; crosslinking the laminate; forming a panel from the crosslinked laminate by patterning the laminate to form a plurality of surface mountable devices; irradiating the panel using electron beam irradiation of at least 20Mrad; and providing individual devices by subdividing the irradiated panel.