Printed wiring board having blind holes

Details Printed wiring board having blind holes Printed wiring board having blind holes

1992-01-27

1994-05-24

Picard, Leo P.

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

174250, 174261, 361784, H05K 100

Patent

active

053150724

ABSTRACT:
The present invention relates to a printed wiring board and a method of manufacturing a printed wiring board. A first printed wiring board and a second printed wiring board, each including an insulating layer and a copper foil layer, are superposed on one another with a middle insulating layer therebetween with blind holes formed in the insulating layers of the boards to oppose one another, through-holes are formed and provided with conductive plating to electrically connect the copper foil layers with each other, and reflow pads are formed by etching in the copper foil layers to seal the blind holes. The blind holes are formed through the insulating layers and reach the copper foil layers. Plated layers are plated on the surfaces of the printed wiring boards on the sides thereof where the blind holes are formed to electrically connect the blind holes and the copper foil layers, respectively.

REFERENCES:
patent: 3546775 (1970-12-01), Lalmond et al.
patent: 4751126 (1988-06-01), Oodaira et al.

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