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Browse Prior Art Database

Defect Visualization in a Printed Circuit Network

IP.com Disclosure Number: IPCOM000052361D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Begasse, P: AUTHOR

Abstract

The device shown above is used to visualize the electrical defects, shorts or opens, on circuit cards.

This text was extracted from a PDF file.
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Defect Visualization in a Printed Circuit Network

The device shown above is used to visualize the electrical defects, shorts or opens, on circuit cards.

A reference printed circuit card 1 without any components is placed in an electrolytic bath in a plastic container 2. The printed circuit surface is arranged in a parallel direction to an aluminum sheet 3 located in the bottom part of the container 2. The aluminum sheet is connected to positive electrode 4, and a movable negative electrode 5 is applied to a known point of the network to be visualized.

Network visualization is obtained by bubbles in a soap-salted solution or colored deposit in a chemical bath. The virtual image of this revealed network is superimposed upon the circuit to be analyzed by optical system 7. If there is an open circuit, the operator now can check the continuity with an ohmeter. If there is a short, the second network is superimposed in the same way and the operator can check with accuracy all the adjacent points of the different networks.

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