Patent ID: 8214982

Claim:
A method of fabricating a plurality of piezoelectric vibrating pieces each having a piezoelectric plate, a pair of exciting electrodes formed on an outer surface of the piezoelectric plate for vibrating the piezoelectric plate when a predetermined drive voltage is applied thereto, and a pair of mount electrodes formed on a base end side of the piezoelectric plate and respectively electrically connected to the pair of exciting electrodes utilizing a wafer comprising a piezoelectric material, the method comprising: an outer shape forming step of forming a frame portion and forming the plurality of piezoelectric plates connected to the frame portion in a cantilever shape by a connecting portion in which base end sides of the piezoelectric plates are connected to the frame portion by etching the wafer using photolithography technology; an electrode forming step of patterning an electrode film on the wafer and respectively forming the pairs of exciting electrodes and the pairs of mount electrodes on the plurality of piezoelectric plates and forming a common electrode respectively electrically connected to the plurality of mount electrodes on a first side of the piezoelectric plates by leads on the connecting portion on the frame portion; a frequency adjusting step of adjusting a frequency of the piezoelectric plate while vibrating the piezoelectric plate by applying a drive voltage between the common electrode and the mount electrode on a second side of the piezoelectric plate; and a cutting step of fragmenting the plurality of piezoelectric plates by cutting the connecting portion and the leads and simultaneously completing formation of the mount electrodes on the first side of the piezoelectric plates.