Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1998-01-29
1999-10-05
Strecker, Gerard
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
439951, G01R 3102
Patent
active
059630450
ABSTRACT:
An edge-testable circuit board includes a circuit board having a planar surface and a board edge. Conductive pads are formed on the board edge and are electrically coupled to test nodes of the circuit on the circuit board. The conductive pads may be located within indentations formed on the board edge. The indentations may be half-circles, half-squares or v-shaped. The conductive pads may be formed by making plated through-holes in the circuit board, electrically coupling the plated-through holes to test nodes on the circuit board, and then removing part of the plated-through holes with a router. The removal step creates a new board edge that exposes part of the plating of the through hole. Numerous such conductive pads may be formed in one step by centering the plated-through holes on a line and passing a router down the line. The circuit board may be tested by bringing it into contact with spring-loaded test probes mounted in a test fixture. Because the conductive pads are formed on the edge of the circuit board, the direction of the force applied by the spring-loaded test probes is coplanar with the plane of the circuit board substrate material, thus reducing deformation of the circuit board during testing.
REFERENCES:
patent: 4145620 (1979-03-01), Dice
patent: 4609240 (1986-09-01), Pistor
patent: 4872843 (1989-10-01), Anstey
patent: 5157829 (1992-10-01), Schmidt et al.
patent: 5315241 (1994-05-01), Ewers
Kelly Timothy J.
Zink Anthony J.
Hart Kevin M.
Hewlett -Packard Company
Kobert Russell M.
Strecker Gerard
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