초록 ▼

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 SiO.sub.2, 5 to 9 wt % of Al.sub.2 O.sub.3, 1 to 10 wt % of B.sub.2 O.sub.3, 3 to 5 wt % of Na.sub.2 O+K.sub.2 O, 3 to 15 wt % of CaO+MgO+ZnO, and 15 to 40 wt % o

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 SiO.sub.2, 5 to 9 wt % of Al.sub.2 O.sub.3, 1 to 10 wt % of B.sub.2 O.sub.3, 3 to 5 wt % of Na.sub.2 O+K.sub.2 O, 3 to 15 wt % of CaO+MgO+ZnO, and 15 to 40 wt % of PbO, and does not contain Li.sub.2 O. A softening point of the glass is 650 to 780.degree. 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.

대표청구항 ▼

[What is claimed is:] [1.]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 SiO.sub.2 ;5 to 9 wt % of Al.sub.2 O.sub.3 ;1 to 10 wt % of B.sub.2 O.sub.3 ;3 to 5 wt % of Na.sub.2 O+K.sub.2 O;3 to 15 wt % of CaO+MgO+ZnO; and15 to 40 wt % of PbO, and

[What is claimed is:] [1.]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 SiO.sub.2 ;5 to 9 wt % of Al.sub.2 O.sub.3 ;1 to 10 wt % of B.sub.2 O.sub.3 ;3 to 5 wt % of Na.sub.2 O+K.sub.2 O;3 to 15 wt % of CaO+MgO+ZnO; and15 to 40 wt % of PbO, anddoes not contain Li.sub.2 O, anda softening point of said glass is in the range of 650 to 780.degree. C. [5.]a laminate substrate formed by laminating a plurality of insulating substrates; anda conductor circuit formed at least on a surface of each of said plurality of the insulating substrates,said insulating substrate being formed of the glass-ceramic composition according to claim 1.