Apparatus and method for producing uniform fired resistors

Details Apparatus and method for producing uniform fired resistors Apparatus and method for producing uniform fired resistors

1982-06-04

1984-09-04

Smith, John D.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Condition of coated material

118608, 118406, 118410, 118413, H01C 1706

Patent

active

044690444

ABSTRACT:
An apparatus and process for producing fired resistors having uniform resistance characteristics, wherein a continuous closed-loop feedback network detects deviations from standard resistivity values and continuously corrects the composition by varying the proportions of high and low resistance material ratios or blends of such materials being screened onto the substrates (212), and detects deviations in screened-on film thickness for continuously correcting either the speed of operation of a screener assembly (No. 1, No. 2) or the squeegee head pressure in order to obtain a predetermined film thickness. The process continuously adjusts the resistance values through on-the-production-line control of mixture ratios of high and low resistive paints, to produce final fired resistors (170) having the required resistance values, temperature coefficients of resistivity, improved stability, and improved TCR tracking values.

REFERENCES:
patent: 2970773 (1961-02-01), Keryluk
patent: 3481306 (1969-12-01), O'Connell
patent: 4338351 (1982-07-01), Bloom

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