Glass-ceramic composition, circuit substrate using the same and manufacture method thereof
AssigneeNgk Spark Plug Co., Ltd.
InventorsShigeru Taga, Hiroyuki Takahashi, Yoshitaka Yoshida
Life of this patent
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Abstract
In the glass-ceramic composition, a weight ratio of a glass and a ceramic is 40 to 60:60 to 40. The glass is composed of 40 to 60 wt % of SiO2, 5 to 9 wt % of Al2O3, 1 to 10 wt % of B2O3, 3 to 5 wt % of Na2O+K2O, 3 to 15 wt % of CaO+MgO+ZnO, and 15 to 40 wt % of PbO, and does not contain Li2O. A softening point of the glass is 650 to 780° C. The circuit substrate includes a laminate substrate formed by laminating insulating substrates, and a conductor circuit formed on a surface of each insulating substrate. The insulating substrate is formed of the glass-ceramic composition. A wiring layer and a via hole conductor are provided inside the laminate substrate.
Claims9
A glass-ceramic composition, wherein
- a weight ratio of a glass and a ceramic is 40 to 60:60 to 40,
- said glass is composed of:
- 40 to 60 wt % of SiO2;
- 5 to 9 wt % of Al2O3;
- 1 to 10 wt % of B2O3;
- 3 to 5 wt % of Na2O+K2O;
- 3 to 15 wt % of CaO+MgO+ZnO;
- and
- 15 to 40 wt % of PbO, and
- does not contain Li2O, and
- a softening point of said glass is in the range of 650 to 780° C.
Dependencies are inferred from the claim text.