Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2006-04-18
2009-08-25
Nguyen, Donghai D. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S830000, C029S846000, C257S703000, C156S252000
Reexamination Certificate
active
07578058
ABSTRACT:
A multilayer ceramic substrate having a cavity is formed by the steps of laminating a plurality of ceramic green sheets including ceramic green sheets having through holes corresponding to the cavity to form a multilayer body, pressing the multilayer body and firing the pressed body. At this time, a shrinkage suppression green sheet is laminated on the surface of the a ceramic green sheet constituting the outermost layer of the multilayer body, and a shrinkage suppression green sheet piece is disposed on the ceramic green sheet exposed to the bottom of the cavity in accordance with the shape of the cavity. A burnable sheet is further disposed on the shrinkage suppression green sheet piece. Before the pressing step, an embedded green sheet separate from the ceramic green sheets (portion separated by inserting a cut) is disposed on the shrinkage suppression green sheet piece or the burnable sheet so that it is filled in the cavity. After the firing step, the embedded green sheet fired is removed.
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Endou Kenji
Fujioka Hideaki
Hatanaka Kiyoshi
Hirakawa Masaharu
Nishino Haruo
Kanesaka Manabu
Nguyen Donghai D.
TDK Corporation
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