Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1995-11-09
1997-01-28
Ryan, Patrick
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428427, 428428, 428432, 428209, 501 2, 501 4, 501 5, 501 6, 501 7, 501 11, 156 89, 427452, B32B 900
Patent
active
055976441
ABSTRACT:
A ceramic circuit board comprises a ceramic substrate having a glaze film formed thereon, the glaze film being overlaid with a functional thin film such as a ferromagnetic film serving as a magnetic sensor, for example. The ceramic substrate is made of a low-firing ceramic material such as a glass ceramic material which can be sintered at a temperature below 1000.degree. C. by co-firing with the glaze film. Preferably, the ceramic substrate has a recess on its top surface, and the glaze film is embedded in the recess such that the difference in level between the ceramic substrate and the glaze film is 20 .mu.m or less. The ceramic circuit board can be produced by preparing a plurality of ceramic green sheets from a low-firing ceramic material, laminating the ceramic green sheets after a through-hole or indentation is formed in the uppermost sheet, thereby forming a multilayer ceramic green substrate having a recess on its top surface, filling the recess with a glaze-forming glass material to such a height that the difference in level between the ceramic substrate and the glaze film formed after firing is 20 .mu.m or less, and co-firing the ceramic green substrate and the glaze-forming glass material at a temperature below 1000.degree. C.
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Araki Hideaki
Fukaya Masashi
Fukuta Junzo
Lee Cathy K.
Ryan Patrick
Sumitomo Metal Ceramics Inc.
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