Ceramic substrate

摘要

A ceramic substrate is described consisting essentially of a crystallized glass and having at least one throught-hole filled with a conductor material having 100 parts by weight of copper and form 1 to 30 parts by weight of a glass having a softening point of 1,000 DEG C. or less and a thermal expansion coefficient of from 1.5x10-6/K to 4.0x10-6/K as measured in a temperature range of from room temperature to 400 DEG C.