| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric filter that implements an easy electrode design adapted for a low frequency, and a high yield.SOLUTION: Piezoelectric plates 2, 3 respectively have split electrodes 7a, 7b; 8a, 8b formed on one surface and a common electrodes 9a, 9b formed on the other surface. Each of the piezoelectric plates 2, 3 has lead electrodes formed in three of four corner portions from the electrodes, respectively. With a portion where a centerline passing the middle of sides in one direction and a centerline passing the middle of sides in the other direction of the piezoelectric plate 2, 3 intersect with each other is defined as piezoelectric plate center portions O1, O2, center portions O1', O2' of the common electrode 9a, 9b is decentered in the direction of the remaining one of the four corner portions of the piezoelectric plate 2, 3 relative to the piezoelectric plate center portions O1, O2. |
