| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystal oscillator which prevents vibration energy from leaking.SOLUTION: A crystal oscillator includes: a rectangular crystal piece having a predetermined thickness; a convex part provided on a principal surface of the crystal piece; an excitation electrode provided on the crystal piece to cover the convex part; and a pair of connection terminals connected to the excitation electrode and provided at end parts of the crystal piece. On a side surface in a side where m-plane of the crystal piece appears, m-plane being a crystal plane of the crystal and a plane perpendicular to R-plane are formed. In a first range from corners of the crystal piece where the connection terminals are provided to a portion where the convex part is not provided, a rate of a region being m-plane occupying in a thickness direction of the crystal piece is 0.7-0.8, and in a second range from a portion where the convex part is provided to the other corner of the crystal piece, the rate of the region being m-plane occupying in the thickness direction thereof is 0.5. |
