CRYSTAL OSCILLATION DEVICE

摘要

Provided is a crystal oscillation device having a low CI value. A crystal oscillation device (1) is provided with a crystal oscillator (11). The crystal oscillator (11) has a crystal plate (12), a first electrode (13), and a second electrode (14). The crystal plate (12) has a rectangular shape in a planar view. The crystal plate (12) has the shape with the thickness thereof reduced toward the outer side from the center. The first electrode (13) is disposed on one main surface (12a) of the crystal plate (12). The second electrode (14) is disposed on the other main surface (12b) of the crystal plate (12). The second electrode (14) faces the first electrode (13) with the crystal plate (12) therebetween. The crystal oscillator (11) oscillates in thickness-shear mode. Each of the first and the second electrodes (13, 14) has an elliptical or circular shape in a planar view.