Patent ID: 7550905
Filing Date: 2009-06-23
Classification: H03H

Abstract:
1. A piezoelectric vibration element including a base made of a piezoelectric material and a plurality of vibration arms extending from the base, the piezoelectric vibration element comprising: a long groove formed along a main surface of each of the plurality of vibration arms; an exciting electrode provided inside each of the long grooves, wherein an irregular shaped part that is on a side face of each of the plurality of vibration arms and protrudes in a plus X-axis direction is processed by a treatment to reduce or remove the irregular shaped part and a center position in a width dimension of the long groove is decentered in a minus X-axis direction from a center position of an arm width dimension; a shrunk width part in which a width of each arm is gradually reduced from the base toward a distal end of each of the plurality of vibration arms; and a changing point P from which the width of each arm constantly increases to the distal end of each arm, the changing point P being disposed between an end of the long groove and the distal end of each vibration arm.