Patent ID: 8643254
Filing Date: 2014-02-04
Classification: G01C,H01L,H03B,H03H

Abstract:
1. A piezoelectric device comprising: a piezoelectric vibrating reed; and a package that air-tightly seals the piezoelectric vibrating reed, wherein the piezoelectric vibrating reed has a vibrating part and first and second supporting arms extending from a base end part of the vibrating part along both sides of the vibrating part, and the first and second supporting arms are extended in a first direction, the package has a box-shaped base of an insulating material, a flat plate-like lid joined to an upper part of the base, a cavity defined by the base and the lid for holding the piezoelectric vibrating reed inside thereof, a convex part projecting from the base or the lid into the cavity, and a sealing hole penetrating the convex part and opening into the cavity and to an outer surface of the package, the piezoelectric vibrating reed is fixedly supported on a bottom surface of the cavity in the first and second supporting arms, the sealing hole is air-tightly closed by a sealing material, a length of the first supporting arm is shorter than a length of the second supporting arm, and the convex part is provided in a range that is outside an area where the piezoelectric vibrating reed is located in a plan view and that is located apart from a leading end of the first supporting arm in the first direction, and the convex part is laterally offset with respect to the second supporting arm in a second direction perpendicular to the first direction.