| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverse mesa type piezoelectric resonator by which pure sinusoidal oscillation satisfying recent strict waveform distortion specifications is possible by suppressing waveform distortion especially resulting from high-order contour vibration. SOLUTION: The inverse mesa type piezoelectric resonator has a piezoelectric board having a notch for instructing the direction of a crystal axis, first and second electrode, wherein the piezoelectric board comprises a main part and a support part which is stretched while forming a step part in the perimeter of the main part and has board thickness thicker than that of the main part, first and second electrode films which are a part of each of the first, second parts are stuck to at least first and second surfaces of the main part and the first surface of the piezoelectric board is provided with an auxiliary film for covering the step part. COPYRIGHT: (C)2008,JPO&INPIT
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