Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Patent
1994-07-22
1995-04-11
Picard, Leo P.
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
174262, H05K 114
Patent
active
054060346
ABSTRACT:
A stepped via is formed in a circuit board. Large holes are punched in a predetermined pattern in two insulating sheets and small holes are punched in the same pattern in another insulating sheet. The holes are dimensioned so that their diameters are larger than the thicknesses of their respective sheets. However, the diameters of the larger holes are less than the combined thickness of all sheets. The sheets are juxtaposed so that the sheet with the smaller holes is between the other sheets and corresponding holes from the respective sheets are aligned. The sheets are pressed together to form an integral substrate. Metallization is applied from one side of the substrate, then metallization is applied to the substrate from the other side.
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Frei John K.
Knuth Howard D.
Tegge Bruce R.
Gorrie Gregory J.
Handy Robert M.
Motorola Inc.
Picard Leo P.
Thomas L.
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