Patent ID: 8760041
Filing Date: 2014-06-24
Classification: H03H

Abstract:
1. A resonator element comprising: a base portion provided on a plane including a first axis and a second axis orthogonal to the first axis; a vibrating arm extending from the base portion in the first axis direction; a first mass portion for adjusting a resonance frequency of the vibrating arm; a piezoelectric film; and first and second electrodes that sandwich the piezoelectric film, the piezoelectric film and the first and second electrodes causing flexural vibration of the vibrating arm, wherein the vibrating arm performs the flexural vibration in a direction perpendicular to the plane and has a first surface which contracts or expands with the flexural vibration and a second surface which expands when the first surface contracts and contracts when the first surface expands, wherein the first mass portion, the piezoelectric film and the first and second electrodes are formed only on the first surface of the vibrating arm, the piezoelectric film and the first and second electrodes are formed on an entirety of the first surface between the first mass portion and the base portion, and the first mass portion is provided approximately at the center of the length of the vibrating arm from a base-side end to a tip end thereof, and a plurality of the vibrating arm on which the first mass portion, the piezoelectric film and the first and second electrode are formed are extend from the base portion in the first axis direction, the plurality equaling one of three and five.