Ceramic substrate and the circuit board for a circuit board

    公开(公告)号:JP4559574B2

    公开(公告)日:2010-10-06

    申请号:JP37151299

    申请日:1999-12-27

    Abstract: PROBLEM TO BE SOLVED: To provide a ceramic substrate which has an improved anti-bending strength, scarcely generates defects such cracks, when assembled or the like, and can form highly reliable ceramic circuit boards and highly reliable heater substrates. SOLUTION: This ceramic substrate 1 is characterized in that the surface roughness (Ra) in the short side direction S is >=1.5 times the surface roughness in the long side on an at least tensile stress-acting side among both the sides of the ceramic substrate 1. It is also preferable that the directions giving the maximum surface roughness are different each other on both the sides of the ceramic substrate 1.

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