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Printed Circuit Deletion Using Capacitor Discharge

IP.com Disclosure Number: IPCOM000049131D
Original Publication Date: 1982-May-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Funari, J: AUTHOR [+4]

Abstract

Circuit deletions are made to make repairs and engineering changes on metallized circuitry on ceramic substrates. These deletions can effectively and economically be made by using electrically isolated welding tips of high resistivity material and circuit means for passing current through the tips and circuit line to be deleted in series.

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Printed Circuit Deletion Using Capacitor Discharge

Circuit deletions are made to make repairs and engineering changes on metallized circuitry on ceramic substrates. These deletions can effectively and economically be made by using electrically isolated welding tips of high resistivity material and circuit means for passing current through the tips and circuit line to be deleted in series.

A pair of welding tips 10 and 11 of high resistivity material are electrically isolated from each other by a suitable sheet of thin insulating material and are fixed on a support arm 12 which is pivotally mounted in a surface welder and cam operated for movement into and out of contact with the metallized surface of the substrate.

The source of electrical power for the welding tips is preferably a capacitor charging discharging circuit. The circuit comprises a DC potential source or battery 13, a capacitor 14, a limiting resistor 15, and a single pole double throw switch 16. The circuit is connected to the welding tips by conductor leads 17 and 18. When switch 16 is connected to its termina1 19, capacitor 14 will become charged and when the switch is connected to its terminal 20, capacitor 14 will discharge and current will flow through welding tip 10, circuit line 21 and welding tip 11 in series to effect a deletion in the circuit line when the tips are down in contact with the line.

This method can also be used for deleting internal circuits.

Prior to a surface-deletion operat...