Patent ID: 8549717

Claim:
A method for manufacturing a piezoelectric device, comprising: preparing a base wafer including multiple package bases each having a first main surface including respective external electrodes and a second main surface opposite the first main surface, the second main surface including a respective peripheral sealing surface, the base wafer also defining at least a pair of respective through-holes located between adjacent package bases wherein each said respective through-hole extends from the first main surface to the second main surface, each said package base, when assembled with a package lid, forms a respective package defining an interior cavity; attaching a respective piezoelectric vibrating piece to each said package base, each said respective piezoelectric vibrating piece including a respective pair of excitation electrodes; preparing a lid wafer including multiple package lids, each said package lid having a first main surface and a second main surface opposite the first main surface, the second main surface of said package lid including a respective peripheral sealing surface; applying a sealing material onto the peripheral sealing surfaces of the package bases or onto the peripheral sealing surfaces of the package lids, the sealing material being applied as a continuous circumferential band having a predetermined width and including a communicating groove allowing temporary pneumatic communication to and from the interior cavity via the through-hole; and in a vacuum or inert-gas atmosphere, allowing gaseous exchange to and from the interior cavities via the respective communicating grooves and through-holes while applying heat and compression, the heat and compression bonding the base and lid wafers together while allowing flow of the sealing material into at least a portion of the communicating grooves sufficient to seal the interior cavities after the gaseous exchange.