System for multiple layer printed circuit board...

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element

Reexamination Certificate

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C324S1540PB

Reexamination Certificate

active

07619434

ABSTRACT:
A test apparatus for determining layer-to-layer misregistration of a multiple layer printed circuit board having an electrical test pattern formed on an inner layer and an electrical test reference formed on an outer layer with the reference electrically connected to the pattern. The apparatus includes a holder for the board, an electrical input device that moves into and out of connection with the reference when the board is in the holder, with the input device adapted to provide a signal to the reference, and an electrical output probe configured to move into and out of electrical connection with the pattern when the board is in the holder. The output probe is adapted to receive at least one signal from the pattern when a signal is provided to the reference, such that the signal received by the output probe conveys layer-to-layer misregistration between the inner layer and the outer layer.

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patent: 6483938 (2002-11-01), Hennessey et al.
patent: 6557154 (2003-04-01), Harada et al.

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