Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1991-04-09
1992-05-12
Echols, P. W.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
29620, 174 35R, 174255, 174259, B05D 512
Patent
active
051126486
ABSTRACT:
A method of manufacturing a printed circuit board is disclosed. The method comprises steps of providing a substrate for the printed circuit board, forming circuit patterns on one or both sides of the substrate, and shielding the whole or a required part of the circuit patterns by using a shield layer in such a manner that the shield layer and a grounding circuit of the circuit patterns are connected through a resistor. This method of manufacturing a printed circuit board is improved so that adhesion between the shield layer and the junction land of the grounding circuit is enhanced by the joining of the shield layer to the junction land of the grounding circuit through the resistor, and that the noise preventive action of the shield layer is improved by the attenuating of electromagnetic-wave energy received by the shield layer which is to be discharged as electrical current to the grounding circuit. For example, such improvement is made by using a resistor having a resistance value higher than that of said shield layer and/or made of a conductive material mainly composed of carbon or copper or both.
REFERENCES:
patent: 4801489 (1989-01-01), Nakasawa et al.
patent: 5030800 (1991-07-01), Kawakami et al.
Ichikawa Jun-ichi
Nikaido Katsutomo
Nishiyama Yoshio
Okonogi Hirotaka
Adams Bruce L.
Echols P. W.
Nippon CMK Corp.
Wilks Van C.
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