Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1993-02-04
1994-03-01
Lateef, Marvin M.
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338 50, 338 51, 338295, 338308, H01C 710, H01C 1300, H01C 1012
Patent
active
052911748
ABSTRACT:
An improved blower motor speed control resistor array in which the resistor elements are defined by multiple optimally sized patches of resistive ink deposited onto opposite sides of a thin flat ceramic substrate. The array comprises three resistive patches connected in series via fusing elements to provide three reduced blower motor speeds MH, M and L. The thin ceramic substrate is flat on both of its faces, and each face comprises a terminal region for attachment of the resistive patches to the terminal elements, and a resistor region for deposition of the three resistive patches. The resistive patch of lowest resistivity (the MH resistor) is deposited on the entire resistor region of a first side of the substrate. The resistor patches of intermediate and highest resistivity (the M and L resistors, respectively) share the resistor region of the other side of the substrate in relation proportion to their respective resistivities.
REFERENCES:
patent: 4342020 (1982-07-01), Utner et al.
patent: 4408244 (1983-10-01), Weible
patent: 4935717 (1990-06-01), Osawa et al.
patent: 5000662 (1991-03-01), Yamamoto et al.
patent: 5218336 (1993-06-01), Murakami
Goubeaux Ronald J.
Zirnheld Richard A.
General Motors Corporation
Lateef Marvin M.
Navarre Mark A.
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