| 摘要 |
PURPOSE:To improve the shock resistance of a piezoelectric resonator adopting a partial electrode such as a series resonator of a ladder filter by forming other electrode to a peripheral of a partial electrode of one major plane of a piezoelectric substrate while insulating with the partial electrode. CONSTITUTION:The electrode 14 is formed to the peripheral of the partial electrode 8 of the piezoelectric resonator 12 while insulated with the said electrode 8. The electrode 14 is formed by applying sputtering, vapor deposition or baking to a prescribed region of the surface of the piezoelectric substrate 6 or etching a silver electrode layer formed on the entire face of the substrate 6 while being isolated from the electrode 8. Thus, in using the piezoelectric resonator 12 as a series resonator 2 for the ladder filter, the deflective strength of the substrate 6 is improved by the electrode 14 to improve shock resistance.
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