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Trimming Printed Resistors

IP.com Disclosure Number: IPCOM000091829D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Clancy, JO: AUTHOR [+4]

Abstract

This method is an automation technique for the adjusting of the ohmic values of printed resistors. The ohmic values of printed resistors are normally adjusted to within acceptable tolerances after printing. This adjustment is normally made by monitoring the resistance while simultaneously eroding away the resistor to reduce the transverse cross-sectional area.

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Trimming Printed Resistors

This method is an automation technique for the adjusting of the ohmic values of printed resistors. The ohmic values of printed resistors are normally adjusted to within acceptable tolerances after printing. This adjustment is normally made by monitoring the resistance while simultaneously eroding away the resistor to reduce the transverse cross-sectional area.

This method for adjusting resistance value employs the sequential steps of measuring the initial ohmic value of resistance, determining the amount of eroding of the resistor required, and eroding the resistor. Preferably the eroding is accomplished by cutting a notch in the resistor by sandblasting.

An advantage of the method is that it is adapted to shorten trimming time since the sandblasting nozzle is adjusted only once. Further, fewer moving equipment parts are required since there is no nozzle movement during trimming.

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