Patent ID: 8618721

Claim:
A piezoelectric device for storing a piezoelectric piece having a pair of excitation electrodes, the piezoelectric device comprising: a package lid, defining a lid recess surrounded by a peripheral first bonding surface; a package base, defining a base recess surrounded by a peripheral second bonding surface configured to mate with said first bonding surface to define an interior space, said base including a pair of seats protruding from the base recess into said interior space and situated for mounting the piezoelectric piece, and a pair of external electrodes on a mounting surface opposite said second bonding surface; a piezoelectric piece mounted onto the pair of seats; and an electrically non-conductive sealing material disposed between said first and second bonding surfaces, for bonding the first bonding surface and the second bonding surface; wherein a first height of the second bonding surface and a second height of the pair of seats with respect to said mounting surface are the same, wherein as viewed from above the package lid, the package base has a rectangular profile; and the package base comprises a pair of castellations formed in a periphery of the rectangular profile; and a pair of connecting electrodes extend from the pair of external electrodes across the pair of castellations and connect to the pair of seats.