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Multilayer Ceramic Via Hole Centrality Master Gauge

IP.com Disclosure Number: IPCOM000048604D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Kutch, G: AUTHOR [+2]

Abstract

This gauge provides a simple and inexpensive tool for quickly determining the accuracy of a punch apparatus setting.

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Multilayer Ceramic Via Hole Centrality Master Gauge

This gauge provides a simple and inexpensive tool for quickly determining the accuracy of a punch apparatus setting.

In multilayer ceramic fabrication, via holes are punched in a green ceramic sheet. The sheet is located for the punching operation by a number of registration holes in the sheet. The accuracy of the punched holes relative to the registration holes must be periodically checked to assure accuracy of the punch setting.

As shown in Fig. 1, a typical green sheet 10 uses four or more registration holes 12 to centralize the via pattern 14. The master gauge consists of 4 registratration pins 16, a chromed glass master with 5-mil black dots 18 precisely located and bonded to a metal base plate 20 so that the center of the glass master and four locating pins coincide within .0001 inch. In use, the punched green sheet 10 is placed over the registration pin 16 and the punched pattern 14 viewed through a microscope to determine the amount the pattern is off location by viewing the area of the black visible portion of the dots through the via holes.

Fig. 3A illustrates the appearance of the black dot 18 in a via hole in pattern 14 as it appears when the punch is in perfect adjustment. Fig. 3B illustrates the appearance of the black dot as viewed through the hole in the green sheet when the pattern is off registration.

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