Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Patent
1989-09-08
1991-03-26
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
174 94R, 174264, 174267, 2281802, H05K 100, H01R 402
Patent
active
050031317
ABSTRACT:
A device for connecting a metal conductor on a surface of a first ceramic body to an outer terminal in which dispersion of copper metal into adjoining layers is prevented. An outer surface conductor made of Cu or Au is connected to the metal conductor on the surface of the ceramic body and extends through a throughhole in a second ceramic body. A lower conductive layer of Pd is formed over and in electrical connection with the outer end of the outer surface conductor, the lower layer having an area greater than the area of the outer end of the outer surface conductor. A dispersion-preventing layer is formed on a portion of the lower layer concentric with the outer end of the outer surface conductor, the dispersion-preventing layer having an area greater than the area of the outer end of the outer surface conductor but less than the area of the lower layer. The dispersion-preventing layer is made of a crystallized glass material. An upper conductive layer is formed over the dispersion-preventing layer and a portion of the lower layer, the upper conductive layer having an area greater than the area of the dispersion-preventing layer but less than the area of the lower layer. A soldering layer formed over the upper layer and a portion of the lower layer in electrical contact with the upper layer and the lower layer, the outer terminal being connected to the soldering layer.
REFERENCES:
patent: 3621442 (1971-11-01), Racht et al.
patent: 3726002 (1973-04-01), Greenstein et al.
patent: 4321617 (1982-03-01), Duda et al.
patent: 4418857 (1983-12-01), Ainslie et al.
Kondo Kazuo
Morikawa Asao
Nimmo Morris H.
NKG Spark Plug Co., Ltd.
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