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IMPROVED QUALITY AND REPAIR TIME FOR PROBECARDS

IP.com Disclosure Number: IPCOM000007696D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-16
Document File: 2 page(s) / 88K

Publishing Venue

Motorola

Related People

Richard W. O'Connell: AUTHOR

Abstract

An alternative method to epoxy ring construc- tion is described. Fixtures manufactured using con- ventional machine shop equipment, replace the prev- alent technique of molding epoxy around probe needles to hold them in place. These fixtures are fabricated from Delrin or ceramic materials and TOP machined in two pieces, a top and bottom as illus- trated in Figure 1. An elastomer covers the inside of the top fixture and controls needle contact force in the Z-axis. The bottom tixture uses grooves that serve as precision guides to control needle movement in X and Y axis.

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MOlVROLA Technical Developments

IMPROVED QUALITY AND REPAIR TIME FOR PROBECARDS

by Richard W. O'Connell

  An alternative method to epoxy ring construc- tion is described. Fixtures manufactured using con- ventional machine shop equipment, replace the prev- alent technique of molding epoxy around probe needles to hold them in place. These fixtures are fabricated from Delrin or ceramic materials and

TOP

machined in two pieces, a top and bottom as illus- trated in Figure 1. An elastomer covers the inside of the top fixture and controls needle contact force in the Z-axis. The bottom tixture uses grooves that serve as precision guides to control needle movement in X and Y axis.

BOTTOM

ELASTOMER

SCiEW HOLES NEEDLE GUIDE

Fig. 1

  Assembly simply requires setting preformed nee- screws illustrated in Figure 2. Needles are soldered dies in the appropriate grooves and connecting the to corresponding circuit traces and needle tips are top and bottom fixtures together. The assembled fix- sanded into planarity.
ture is then mounted to a custom circuit board with

NEW ASSEMBLY

PROBE NEEDLE

Fig. 2

0 Moiorolr. 1°C. 19% 134 May 1996

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8

M-ROLA Technical Developments

  Repair is simple. Screws arc removed from the top cover of the assembly and needles requiring replacement are unsoldered from the circuit traces. The damaged or worn needles are replaced with new pre-formed needles and the top is re-attached. The new needles are soldered to the circuit traces and the tips are sanded int...