| 摘要 |
A ceramic circuit substrate having a resistor deposited on a surface thereof, said ceramic substrate having a coefficient of thermal expansion ranging from 5.0x10-6/ DEG C. to 7.0x10-6/ DEG C., the resistor being coated with a glass overcoat and made of 15 to 50% of RuO2 and 85 to 50% of a CaO-Al2O3-SiO2-B2O3-system glass, the glass overcoat being made of 60 to 100% of a CaO-Al2O3-SiO2-B2O3-system glass and up to 40% of alumina, wherein the resistor has a coefficient of thermal expansion greater than that of the glass overcoat. Due to the above specific relationship between the coefficient of thermal expansion of the resistor and that of the overcoat, the resistor is not subject to cracking at the time of trimming and thereafter, and realizes the exertion of resistance performance ensuring excellent weather resistance and stability.
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