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Fabrication of a Cast Epoxy Guide

IP.com Disclosure Number: IPCOM000080065D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Cummins, AW: AUTHOR [+4]

Abstract

One of the requirements of a multiple probe unit for testing of large-scale integrated (LSI) components is a guide for the probes, and where the probes are of a rectangular cross-section, fabrication of such a guide is difficult due to the hole shapes and required precision.

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Fabrication of a Cast Epoxy Guide

One of the requirements of a multiple probe unit for testing of large-scale integrated (LSI) components is a guide for the probes, and where the probes are of a rectangular cross-section, fabrication of such a guide is difficult due to the hole shapes and required precision.

In the method described here, a negative model is first made and used for casting the guide. As indicated in Fig. 1, a square tube 1 has a wide groove 2 cut in each face and each face is then cut with two transverse cuts 3, to leave a thickness of metal equal to the depth of a desired probe slot. Each of the eight transverse cuts is then slotted lengthwise with a plurality of slots, to leave rods 6 equal in width to the width of the desired probe slot and at the desired openings. A flat sheet 4 of material having a thickness equal to the depth of the probe slots is cut to fit in each of the slots 2 of tube 1, and is slotted to leave rods 5 in register with the rods 6 of tube 1.

When sheets 4 are assembled to tube 1, the parts are placed in a mold and a guide material is cast around the assembly. After the casting is solidified, it is removed and milled into a form as in Fig. 2 where all of the tube 1 has been removed except the rods 5 and 6. The casting is now formed of two narrow square ends 8 connected by a square rod 9 slightly smaller than the central hole originally in tube 1. The guide is then treated to etch out the remaining portions of rods 5 and 6,...