Browse Prior Art Database

Flexible Electrical Probe and Method of Manufacture

IP.com Disclosure Number: IPCOM000088280D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Greene, KF: AUTHOR [+3]

Abstract

The drawing shows a probe that is adapted to make electrical contact with terminals that may be closely spaced, recessed below other components, and of irregular height. Fig. 1 shows an edge view of two signal conductors 2, 3, an intervening ground plane 4, and two elastic layers 5, 6 that provide electrical insulation and physical support for the two signal conductors. Fig. 2 is a side view showing elastic layer 6 and additional signal conductors 3. Fig. 2 also shows test terminals 7 and their support 8. The spacing between the signal conductors, as seen in Fig. 2, and between signal conductors 2 and 3 in Fig. 1 is selected according to the spacing of the locations that are to be probed.

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Flexible Electrical Probe and Method of Manufacture

The drawing shows a probe that is adapted to make electrical contact with terminals that may be closely spaced, recessed below other components, and of irregular height. Fig. 1 shows an edge view of two signal conductors 2, 3, an intervening ground plane 4, and two elastic layers 5, 6 that provide electrical insulation and physical support for the two signal conductors. Fig. 2 is a side view showing elastic layer 6 and additional signal conductors 3. Fig. 2 also shows test terminals 7 and their support 8. The spacing between the signal conductors, as seen in Fig. 2, and between signal conductors 2 and 3 in Fig. 1 is selected according to the spacing of the locations that are to be probed. The signal conductors are at an angle to the surface of the electrical device that is to be probed, and the conductors flex easily if the surface of the device is irregular.

The probe is formed by printed-circuit techniques. Elastic layers 5 and 6 and portions 5', 6' (shown by dashed lines) are formed on opposite sides of a copper foil that forms the ground plane 4 and a temporary extension 4' (shown by dashed lines). A layer of copper is formed on the opposite outer surfaces of elastic layers 5 and 6 and is etched to form the diagonal conductor pattern of Fig.
2. Portions 4', 5', 6' are then removed.

Diagonal conductors can also be formed by exposing a photoresist through a mask with the resist and a copper substrate supportin...