Metal working – Method of mechanical manufacture – Electrical device making
Patent
1992-01-09
1993-01-26
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29621, H01C 1706, H01C 1728
Patent
active
051813130
ABSTRACT:
A variable power resistor includes a heat sink having a front face and a back face with an electrically insulating, thermally conductive ceramic coating bonded directly onto the front face such that the ceramic coating is in direct thermal contact with the heat sink. A plurality of discrete thick film conductive circuit pads are positioned on the electrically insulating, thermally conductive ceramic coating and a thick film resistive layer is positioned over portions of the conductive circuit pads such that the pads are electrically connected in series. The variable power resistor also includes a moveable contactor capable of contacting the circuit pads in order to vary the resistance of the resistor and an electrical connection between the resistor and an electrical circuit. The electrically insulating, thermally conductive ceramic coating may be plasma sprayed onto the heat sink, while the resistive circuit may be screen printed onto the ceramic coating.
REFERENCES:
patent: 3206702 (1965-09-01), Greenwood
patent: 3838071 (1974-09-01), Amin
patent: 4885434 (1989-12-01), Vultaggio et al.
patent: 5053283 (1991-10-01), Brown
Lewis Richard C.
Nonnenmacher Ronald C.
Riley Richard
Schulz Kathleen
Echols P. W.
Romanik George J.
United Technologies Automotive
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