Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1979-12-10
1982-05-04
Kendall, Ralph S.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
174 685, 324158P, 427 96, H05K 342, H01R 909
Patent
active
043282644
ABSTRACT:
Method and apparatus to test continuity of miniature printed circuit board traces prior to installation of components. A short circuits probe and an open circuits probe are each provided which are specific to the pattern of traces to be tested. The probes are constructed by adapting a mirror image of the traces to be tested as probe contact points and registering the adapted mirror image as plating on a second circuit board substrate. Interconnections between contact points are typically provided on the back side of the second substrate. The interconnections couple the contact points with a continuity indicator. The circuit pattern specific probes according to the invention are employed by aligning the contact points with the circuit board traces to be tested and then effecting contact therebetween. The plating forming the contact points is of sufficient uniformity and elevation to provide desired clearance between adjacent traces. Short circuits are identified by indicated continuity between a test of traces, typically adjacent traces, where no contact should exist, and open circuits are identified by lack of indicated continuity through tested traces. The probes are typically employed in "go, no-go" testing protocols of miniature circuit boards in a mass production environment. In particular, the probes are most useful in testing circuit board traces where intertrace spacing is less than about 0.5 millimeter and is typically as small as about 0.02 millimeter. The invention eliminates the need for primary visual inspection, which in the case of miniature circuit boards is tedious and unreliable.
REFERENCES:
patent: 3803709 (1974-04-01), Beltz et al.
patent: 4061969 (1977-12-01), Dean
patent: 4164704 (1979-08-01), Kato
Johns William E.
Locklin David E.
Kendall Ralph S.
Printed Circuits International, Inc.
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