Thick film resistor assembly for fan controller
AssigneeInternational Resistive Company, Inc.
InventorThomas M. Morris
Life of this patent
Estimating the term…
Abstract
A power resistor assembly includes an anodizable metal substrate, preferably an aluminum alloy, having an insulating anodized coating on at least one flat side. A resistive or partially conductive ink is screen printed on the anodized coating in a pattern to provide one or more resistors. The ink has a curing temperature below 660.degree. C. which is below the melting point of aluminum. The resistor assembly is a vehicular fan motor controller or an interior dimmer switch. The fan motor controller has resistor ends which are soldered with tin-lead solder.
Claims10
A fan motor controller comprising a resistor assembly having
- an anodizable metal substrate having a flat portion and an insulating anodized coating bonded directly to the flat portion;
- at least two screen printed thick film power resistors of different resistance value bonded to the anodized coating with an adhesion of at least 0.25 kg/0.01 in.sup.2 and having two ends and a capacity of at least three watts, the thick film power resistor comprising a metal and a fused borosilicate glass binder having a curing temperature below the melting point of the substrate and below 660.degree. C.;
- and
- a conductive terminal and a solder bonding the terminal to the resistor ends.
A fan motor controller comprising a resistor assembly having
- an anodizable metal substrate comprising a flat sheet being no more than about three millimeters thick and having an insulating anodized coating bonded directly to the flat sheet;
- at least one screen printed thick film power resistor bonded to the anodized coating with an adhesion of at least 0.5 kg/0.01 in.sup.2 and having two ends and a capacity of at least three watts, the thick film power resistor comprising copper and a low melting point glass having a softening temperature substantially below 660.degree. C. and below the melting point of the substrate;
- and
- a conductive terminal and a tin-lead solder bonding the terminal to the resistor ends.
Dependencies are inferred from the claim text.