Patent ID: 7421767

Claim:
A method for manufacturing a piezoelectric vibration device, comprising: (a) forming a bonding electrode on a part of a piezoelectric substrate to which a cover makes contact so that so that the bonding electrode extends along an outer shape of the piezoelectric substrate and is electrically coupled to a taking out electrode continuously extended from an exciting electrode on the piezoelectric substrate, the piezoelectric substrate generating a vibration based on a driving signal input into the exciting electrode; (b) forming a part defining a through hole to the cover so that a profile of an edge of an opening of the through hole at a first surface of the cover is positioned inside an outer shape of the taking out electrode in a plan view when the cover and the piezoelectric substrate are overlapped so that the first surface covers a portion of the piezoelectric substrate generating the vibration so as to prevent a generation of the vibration from being inhibited by the cover, and a relative position of the cover and the piezoelectric substrate is aligned; (c) forming a first glass film on the first surface of the cover so that the first glass film surrounds an entire circumference of the edge of the opening of the through hole at the first surface and an entire inner circumference of the first glass film makes contact with the taking out electrode when the relative position of the cover is aligned; (d) forming a second glass film on the first surface of the cover so that the second glass film makes contact with the bonding electrode and seals a gap between the cover and the bonding electrode when the relative position of the cover is aligned; (e) bonding the first glass film to the taking out electrode and bonding the second glass film to the bonding electrode by generating an electric field so that a predetermined potential difference is given between the bonding electrode set as a positive electrode, and the first and the second glass films that are set as a negative electrode while a relative position of the piezoelectric substrate obtained in step(a) and the cover obtained in step (d) is aligned; and (f) cutting an electrical coupling between the taking out electrode and the bonding electrode after step (e), wherein the piezoelectric substrate includes a plurality of piezoelectric substrates while the cover includes a plurality of covers.