| 摘要 |
PURPOSE: A piezoelectric vibrator piece and a piezoelectric vibrator are provided to reduce a CI(Crystal Impedance) value by controlling bonding with an undesired mode including thickness-shear vibration and contour vibration at a parallel direction to a Z-axis. CONSTITUTION: A piezoelectric oscillation piece is composed of an AT cut quartz substrate. A piezoelectric substrate(10) has a thickness direction which is parallel to Y' axis. An excitation electrode(20) is arranged to face both sides in an oscillation area of both main surfaces of the piezoelectric substrate. The piezoelectric substrate includes a rectangular excitation portion(14) using a long side which is parallel to an X-axis and a short side which is parallel to a Z'-axis. The piezoelectric substrate includes a peripheral unit(12) having smaller thickness than that of the excitation portion. The peripheral unit is formed around the excitation portion. Sides(14a,14b) are extended to a parallel direction to the X-axis of the excitation portion. Each of sides(14c,14d), which is extended to the parallel direction to the Z'-axis of the excitation portion, has level difference. |
