| 摘要 |
PROBLEM TO BE SOLVED: To obtain a circuit board, wherein the bonding property of an electrode part which is formed on one face of a ceramic board and which comprises a plated layer on the outermost layer to a protective film which covers the electrode part can be enhanced. SOLUTION: Amorphous glass is used as a material for a protective film 16. Since amorphous glass does not have a crystallization temperature, it is set to a state, that it is always in a softened state in a temperature region at a softening temperature or higher, and the wetting time with reference to a plated layer 14 by the material for the protective film can be ensured to be long. Thereby, it is possible to ensure sufficient bonding strength even with respect to the plated layer 14 in which there are small irregularities and oxides.
|
