| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibration element that improves spurious caused by an inharmonic mode.SOLUTION: The vibration element vibrates by thickness slip vibration, and comprises a substrate including a first principle plane and a second principle plane having a front-back relationship, and a first excitation electrode provided on the first principle plane, and a second excitation electrode that is provided on the second principle plane and is larger than the first excitation electrode in a plan view. The first excitation electrode is disposed so as to stay in the outer fringe of the second excitation electrode in a plan view, and the energy confinement coefficient M of the vibration element satisfies 15.5≤M≤36.7. |
