Ceramic heater roller with thermal regulating layer

H - Electricity – 05 – B

Patent

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Details

H05B 3/14 (2006.01) G03G 15/20 (2006.01) H05B 3/00 (2006.01)

Patent

CA 2163877

A thermal conduction roller (10) for use in industrial and office equipment includes a ceramic heater layer (13) and a second ceramic layer (12) disposed in between the ceramic heater layer and the core. The second ceramic layer (12) has a resistance characteristic such that resistance of the roller decreases with heating to approximately the same order of magnitude as resistance in the longitudinal direction. This causes electrical current to be diverted from the ceramic heater layer (13) to limit the temperature in that layer and any outer layer (17) contacting a work object.

Un rouleau à conduction thermique (10) s'utilisant dans un équipement industriel et un équipement de bureau comprend une première couche de céramique chauffante (13) et une seconde couche de céramique (12) placée entre la couche de céramique chauffante et l'âme. La seconde couche de céramique (12) possède une caractéristique de résistance telle que la résistance du rouleau décroît en même temps que la température augmente, approximativement dans le même ordre d'amplitude que la résistance allant dans le sens longitudinal. Ceci provoque la déviation du courant électrique provenant de la couche céramique chauffante (13) et limite la température dans cette couche-là et dans toute couche externe (17) se trouvant en contact avec un objet de travail.

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