Browse Prior Art Database

Quadrant Probe

IP.com Disclosure Number: IPCOM000074841D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Watson, RH: AUTHOR

Abstract

A probe for making electrical contact to all the pads on a micrologic circuit with repeatable and substantially equal, contact force and resistance.

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Quadrant Probe

A probe for making electrical contact to all the pads on a micrologic circuit with repeatable and substantially equal, contact force and resistance.

The probe is fabricated so that each probe wire has a cantilever arm length equal to that of every other probe wire. A standard printed, circuit board 10 has one end formed in a point and a series of electrically conductive lines 12a, 12b, 12c, 12d, 12e, 12f, 12g & 12h are formed on its upper surface, as shown in Fig. 1; and, a series of electrically conductive lines 14a, 14b, 14c, 14d, 14e, 14f, 14g & 14h are formed on its lower surface, as shown in Fig. 2. Each of the lines 12a through 12h and 14a through 14h are directed toward a common point on the center line of the board 10.

The point of the board 10 is then reduced to a pair of arcs 16 and 17 extending from each edge of the point to the center line of the board. These arcs 16 & 17 are established by measuring a fixed distance d, as shown in Fig. 3, from pad locations 18a, 18b, 18c & 18d of a chip 19 to the lines 12a, 12b, 12c & 12d and from pad locations 18e, 18f, 18g & 18h and to the lines 12e, 12f, 12g & 12h, respectively. Once these arcs 16 & 17 are formed on the upper surface of board 10, the lower surface of the board 10 is reduced in a similar manner. The arc 20 on the lower surface of the board is formed by measuring the same fixed distance d from pad locations 23a, 23b, 23c & 23d to lines 14a, 14b, 14c & 14d, respectively; and, arc 21 is...