Patent ID: 8973440
Filing Date: 2015-03-10
Classification: G01C,H03H

Abstract:
1. A resonator element comprising: a base; and a pair of vibrating arms that extends from the base in a first direction in a plan view, the vibrating arms are located next to each other in a second direction perpendicular to the first direction, the vibrating arms performing flexure-torsional combined vibrations, each of the vibrating arms having a spindle portion and an arm portion, the arm portion being sandwiched by the base and the spindle portion, wherein the spindle portion has a first surface and a second surface that is opposite to the first surface, and a first groove is provided in at least one of the first and second surfaces, the arm portion has a third surface, which is continuous with the first surface, and a fourth surface, which is continuous with the second surface and opposite to the third surface, a second groove is provided in at least one of the third and fourth surfaces, and the second groove extends along the first direction, each of the first and second grooves overlaps with an imaginary line passing through a center of gravity of each of the vibrating arms in a plan view, the first and second grooves are separately provided, and an electrode is provided on the first surface, the second surface, an inner surface of the first groove, a side surface that interconnects the third surface and the fourth surface, and an inner surface of the second groove.