Patent ID: 7436272
Filing Date: 2008-10-14
Classification: B81B,H03H

Abstract:
1. A piezoelectric device, comprising: a cover having a first surface and a second surface opposite the first surface; a piezoelectric device chip sealed to the first surface of the cover; first external electrodes exposed at the second surface of the cover; a grounded second external electrode exposed at the second surface of the cover; and an electroconductive bonding material disposed between the first surface of the cover and the piezoelectric device chip and around an outer edge thereof, the electroconductive bonding material sealing the cover to the piezoelectric device chip and connected to the grounded second external electrode, wherein each of the first external electrodes are disposed in a center portion of one of four respective rectangular regions resulting from division of the second surface of the cover into equal parts in a lattice pattern such that the first external electrodes are substantially uniformly arranged at the second surface of the cover, and the second external electrode is disposed along a vertex of at least two of the four respective rectangular regions.