| 摘要 |
PURPOSE: To prevent self-welding between an Ag electrode provided on the surface of a piezoelectric material substrate and a metallic terminal whose surface an Ag film brought into contact with this Ag electrode is provided on. CONSTITUTION: Metallic films 4 having a high melting point are formed on oscillation electrodes 3 which are provided on front and rear faces of a piezoelectric material substrate 2 and consist of Ag. Ni, Cr, W, Ti, Mo, Ni-Cu (Monel), or alloys of these metals is used as materials of these metallic films 4. It is preferable that the thickness of these metallic films 4 is about <=1/10 of the thickness of oscillation electrodes 3 or <=1μ.
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