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

1980-09-10

1982-07-06

Smith, John D.

Coating processes

Measuring, testing, or indicating

29620, 427 9, 427 10, 427101, 427102, H01C 1706

Patent

active

043383513

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 fired 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.

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Sergent et al., "Design Method for Thick Film Resistors", Solid State Technology, Oct. 1977, pp. 63-67.
Mones et al., "Combination Glaze Resistor", IBM TDB, vol. 8, No. 5, Oct. 1965, pp. 735-736.

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