Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1985-05-31
1987-03-17
Kucia, R. R.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
361411, 361414, 501 73, 501 77, H05K 103
Patent
active
046509232
ABSTRACT:
In an article comprising a ceramic body fired at a comparatively low temperature and a circuit pattern attached to the body, the ceramic body is produced from a preselected composition comprising first powder of alumina and second powder of a vitreous material which comprises any one of MgO-Al.sub.2 O.sub.3 -SiO.sub.2, CaO-MgO-Al.sub.2 O.sub.3 -SiO.sub.2, CaO-Al.sub.2 O.sub.3 -SiO.sub.2 glass, CaO-Al.sub.2 O.sub.3 -SiO.sub.2 -B.sub.2 O.sub.3 glass, MgO-Al.sub.2 O.sub.3 -SiO.sub.2 -B.sub.2 O.sub.3 glass, and CaO-MgO-Al.sub.2 O.sub.3 SiO.sub.2 -B.sub.2 O.sub.3 glass. The ceramic body comprises coexistence of an alumina part, a noncrystallized part, and a crystallized part and exhibits an excellent moisture proof. The circuit pattern comprises an internal conductive pattern of Ag and an external conductive pattern of an alloy of Ag-Pd. A chromium component may be included in the internal and the external conductive patterns. External and internal resistor patterns are placed on and within the ceramic body with a high and a low precision. The internal resistor pattern can be adjusted by the use of a laser beam through a thin film included in the ceramic body.
REFERENCES:
patent: 3236662 (1966-02-01), MacDowell
patent: 4313900 (1982-02-01), Gonzales et al.
patent: 4490429 (1984-12-01), Tosaki et al.
Fukaya Masashi
Fukuda Junzo
Nishigaki Susumu
Yano Shinsuke
Kucia R. R.
Narumi China Corporation
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