Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1988-07-07
1990-01-16
Karlsen, Ernest F.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
174266, G01R 3102
Patent
active
048946060
ABSTRACT:
A system for measuring the amount of misregistration of layers of multilayer printed circuit boards. The system utilizes a conductive plane having a fixed pattern of apertures and a common contact portion. One plane is attached to each inward layer of the board at the same location for each layer. The aperatures have a predetermined and progressively increasing diameter. Uniform diameter through-hole conductors are formed in the layers after assembled, with one conductor extending through each of the apertures. For a board with all inward layers in perfect registration with the outward layer, incrementally increasing clearances exist between the conductors and the edges of the corresponding apertures. One or more of the conductors is in electrical contact with a plane if the inward layer to which attached is out of registration by an amount at least as great as the corresponding conductor clearance. A tester is used to determine if conductive paths exist between the conductors and the planes and for indicating the conductors for which a conductive path is determined to exist, thus quantitatively indicating the amount of layer misregistration.
REFERENCES:
patent: 3243498 (1966-03-01), Allen et al.
patent: 3859711 (1975-01-01), McKiddy
patent: 4432037 (1984-02-01), Brabetz
patent: 4510446 (1985-04-01), Braun et al.
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