Patent ID: 9543922
Date: 2017-01-10
CPC Classifications: H03H

Claim:
1. A resonator element, comprising: a resonator section having a thickness that is greater than a thickness of a peripheral section on a board surface of a substrate formed in a rectangular shape, the peripheral section having a fixed position, wherein the resonator section resonates with thickness shear vibration, when the length of the long side of the substrate is x and the board thickness of the resonator section is t, y being set to fulfill a relationship in the following equation, based on the board thickness t, y being a percentage value of a difference between the board thickness t and the thickness of the peripheral section over the board thickness t, and the resonator section comprising a level-difference section, the level-difference section being adjacent to the peripheral section and having a level-difference plane, wherein the level-difference section is positioned at a maximum amplitude of a flexural mode occurring along a displacement direction of the thickness shear vibration in the substrate.