Importance

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Abstract

Multilayer circuit assemblies are made by stacking circuit panels having contacts on their top surfaces, through conductors extending between top and bottom surfaces and terminals connected to the bottomend of each through conductor. The terminals and contacts are arranged so that when the panels are stacked the terminals on the bottom of one panel are in alignment with the contacts on the top surface of the immediately underlying panel. The panels are selectively treated on their top and/or bottom surfaces so as to selectively disconnect or connect each contact to a terminal on the bottom surface of the same panel. For example, the top surface of the panel may be selectively etched to disconnect a contact from one through conductor and hence from the associated terminal. The aligned terminals and contacts are nonselectively connected to one another at each interface so that wherever a terminal and contact on adjacent panels are aligned with one another there are connected to one another. This forms composite vertical conductors extending through a plurality of the panels. The selective treatment of the panel top and bottom surfaces provides selective interruptions in the vertical conductors. A circuit panel precursor having the through conductors and methods of making the same are also provided.

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First Claim