Patent ID: 7999637
Filing Date: 2011-08-16
Classification: H01L,H03H

Abstract:
1. A piezoelectric vibration piece comprising: a base made of a piezoelectric material; a plurality of vibration arms that are integrally formed with the base; elongate grooves that are formed along longitudinal directions of the vibration arms in principal surfaces of the vibrating arms; inner electrodes disposed in the elongate grooves; side electrodes disposed on side surfaces of the vibrating arms; wherein widening portions are formed at a junction of the vibration arms and the base, a width of the widening portions being widened toward the base while a widening degree is changed at a change point; and wherein at least one of the side electrodes is led to the principal surface and the side surface of at least one of the plurality of vibration arms at the widening portion and covers the change point.