Patent ID: 8429800

Claim:
A method for manufacturing a piezoelectric device, the method comprising: preparing a piezoelectric wafer defining multiple piezoelectric frames, the frames including respective piezoelectric vibrating pieces and respective frame portions surrounding the piezoelectric vibrating pieces, the piezoelectric vibrating pieces including respective excitation electrodes; preparing a lid wafer defining multiple lids, the lids being individually sized substantially similarly to the respective frame portions on the piezoelectric frames; preparing a base wafer defining multiple bases, the bases being individually sized substantially similarly to the respective frame portions on the piezoelectric frame and individually defining at least one respective through-hole extending through a thickness of the respective base; forming stripes of a first bonding film on both major surfaces of the piezoelectric wafer, the stripes being arranged into rectangular patterns, each pattern extending inboard of a periphery of a respective frame portion; forming stripes of a second bonding film on one major surface of the lid wafer so as to correspond to the respective stripes of the first bonding film; forming stripes of a third bonding film on one major surface of the base wafer so as to correspond to the respective stripes of the first bonding film; placing bonding material between the stripes of the first bonding film and corresponding stripes of the second bonding film, and between the stripes of the first bonding film and corresponding stripes of the third bonding film; forming a sandwich of the piezoelectric wafer between the lid wafer and base wafer, in which the respective stripes of the first bonding film and the corresponding second bonding film and the respective stripes of the first bonding film and the corresponding third bonding film are aligned with each other; causing the bonding material to bond together the piezoelectric wafer, lid wafer, and base wafer; and after bonding, and in a vacuum or inert gas atmosphere, sealing the through-holes using a sealing material that melts at a temperature lower than a melting point of the bonding material; wherein respective concavities are defined outboard of extreme peripheries of the respective piezoelectric vibrating devices; and the bonding material is placed on the respective concavities.