| 摘要 |
PURPOSE:To improve spurious characteristic by forming a vibrating electrode made of a conductive coating film to both main surfaces of a piezoelectric substrate and applying conductive or insulation paste to at least one surface of the conductive coating film thereby reducing the parasitic vibration of the piezoelectric resonator itself. CONSTITUTION:Vibration electrodes 2a, 2b made of conductive film are formed to both major surfaces of a piezoelectric substrate 1 and the resonator is used at the spread vibration mode. A conductive or insulation paste 3a is applied to at least one surface of the conductive film. Thus, a mass is added to the vibration electrodes 2a, 2b. Thus, the parasitic vibration of high order is suppressed especially by the added mass and the spurious level is drastically reduced, Furthermore, the coating film by the conductive or insulation paste 3a stuck on the vibration electrodes 2a, 2b does not give much effect onto the vibration of the fundamental wave and the characteristic in the fundamental frequency is not almost deteriorated.
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