| 摘要 |
PURPOSE:To keep constantly a desired low Qm by using an electrode at the element surface so as to be formed by chemical plating while the film thickness is used as the resonator to be controlled for a required mechanical Q. CONSTITUTION:Terminal boards 2, 3 hold a piezoelectric resonator element 1 while projections 2a, 3a are pressed into contact with the center (corresponding to the node of vibration) of electrodes 4, 5 formed on the major surface at both sides of the element 1. The element 1 and the terminal boards 2, 3 are contained in a resin case, the case bottom is closed by a paper base while terminal board leads 2b, 3b are projected from the opening of the case bottom and sealed by a seal member for the product. The piezoelectric resonator element 1 is made of a ceramic such as a PZT or a barrium titanate and the electrodes 4, 5 of the major surface at both sides are formed by chemical plating. In forming the electrodes 4, 5 by chemical plating, the film thickness of the electrodes are adjusted with high accuracy by controlling the plating time and then the piezoelectric with a desired Qm is manufactured.
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