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A technology is described for accessing small circuit pads without mechanical contact. The technique permits electrical continuity measurements to be made.
English (United States)
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Measurement of Electrical Continuity in Circuit Boards
A technology is described for accessing small circuit pads without
mechanical contact. The technique permits electrical continuity measurements
to be made.
Generally, circuit boards require tests to assure electrical continuity of the
deposited circuit pattern. For many circuits, it becomes difficult, if not impossible,
to access very small circuit pads without the use of special fixtures. It would be
highly advantageous to have a way to test circuits for repair purpose without the
use of mechanical probes. Generally, mechanical probes are too large or cause
damage to the pads.
A quasi contactless method that permits access to small lines
and pads for the purpose of circuit (continuity) testing is proposed.
An example is shown in the drawing. Here, it is assumed that
connection can readily be made to a ground plane and that electrical
continuity is required between a small pad on the board and the
ground plane. A focused laser is used to illuminate a small conical
region of a photo-conducting fluid over the board: This fluid can be
spread out over the entire board, or it may be in the form of a
droplet, a gel or a viscous fluid. A small probe is placed in the
upper region of the conically illuminated fluid. Photoconduction of
the fluid is established by a photochemical reaction, as described by A. Aviram, Macromolecules 11, 1275 (1978). The relatively slow
change in resistivity reported will be greatly increa...