Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1987-03-12
1989-01-31
Robinson, Ellis P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428546, 428901, 427 96, 174 35R, 174 35MS, 174 36, 333238, 156297, 361378, 361402, B32B 300, B32B 3100, H05K 900
Patent
active
048014893
ABSTRACT:
A printed circuit board capable of preventing electromagnetic interference comprises a base plate composed of an insulating material. On the main surface of the base plate, a first electric conductive layer is formed by etching copper foil, which includes a signal electrode portion and a ground electrode portion. On the first electric conductive layer, an insulating layer such as a solder resist film is formed except for a part of the ground electrode portion, and on this layer, a second electric conductive layer is formed by screen-printing a copper ink so as to cover almost all of the first electric conductive layer. A part of the second electric conductive layer is connected to the ground electrode portion of the first electric conductive layer so that the second electric conductive layer acts as an electromagnetic shield. The copper ink is a mixture of copper powder, binder and other materials. A solder layer may be formed on the second electric conductive layer composed of the copper ink.
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patent: 4514586 (1985-04-01), Waggoner
patent: 4556757 (1985-12-01), Oberbach
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Eguchi Kazumasa
Murakami Hisatoshi
Nakagawa Katsuya
Nakatani Fumio
Terada Tsunehiko
Jackson Larry A.
Nintendo Co. Ltd.
Robinson Ellis P.
Ryan P. J.
Tatsuta Electric Wire & Cable Co.
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