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Browse Prior Art Database

Notched Commoning Bar

IP.com Disclosure Number: IPCOM000102966D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 33K

Publishing Venue

IBM

Related People

Jung, DY: AUTHOR [+2]

Abstract

Disclosed is a method for commoning edge tabs on a printed circuit card after the circuitry has been defined on the card. The disclosed method creates electrically independent edge tabs, on a PC card, which can be individually tested, prior to precious metal plating. Each tab leads to a notch in the main bus bar for plating connection. Commoning the tabs, required for plating, is accomplished by application of a conductive material to the bus bar. The conductive material need only bridge a small gap to affect commoning (see figure). The mass of the bus bar is such that the applied material need only carry sufficient current for a single tab.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Notched Commoning Bar

      Disclosed is a method for commoning edge tabs on a printed
circuit card after the circuitry has been defined on the card.  The
disclosed method creates electrically independent edge tabs, on a PC
card, which can be individually tested, prior to precious metal
plating.  Each tab leads to a notch in the main bus bar for plating
connection.  Commoning the tabs, required for plating, is
accomplished by application of a conductive material to the bus bar.
The conductive material need only bridge a small gap to affect
commoning (see figure).  The mass of the bus bar is such that the
applied material need only carry sufficient current for a single tab.

      The conductive material can be paint, epoxy, adhesive, solder
or solid conductor.  Application can be by brushing, spraying, nozzle
wheel transfer, solder or welding.

      The removal of the applied material occurs during normal
machining operations used to produce the final dimensions of the PC
card and does not add cost to the product.

      Disclosed anonymously.