Patent ID: 7224105
Filing Date: 2007-05-29
Classification: H03H

Abstract:
1. A piezoelectric element comprising: a substrate; a lower electrode layer laminated on or above the substrate; a piezoelectric layer laminated on or above the lower electrode layer; an upper electrode layer laminated on or above the piezoelectric layer; a cavity portion formed below a piezoelectric vibrating portion including the lower electrode layer, the piezoelectric layer and the upper electrode layer; and at least two bridging portions extending from a portion of a periphery of the piezoelectric vibrating portion, for supporting the piezoelectric vibrating portion with the substrate above the cavity portion, wherein the at least two bridging portions are formed so as not to be line-symmetric with respect to any line segment traversing the piezoelectric vibrating portion and so as not to be point-symmetric with respect to any point in the piezoelectric vibrating portion in a projection of the piezoelectric vibrating portion in the laminating direction.