Patent ID: 8016573

Claim:
A piezoelectric-driven diaphragm pump, comprising: a driving unit comprising a driving diaphragm and a first housing that holds the driving diaphragm, the driving diaphragm having a piezoelectric element, a diaphragm sheet which is elastically transformed corresponding to transformation of the piezoelectric element, and a displacement transmission member provided on a face of the diaphragm sheet, a driven unit driven by the driving unit, the driven unit having a driven film to which vibration of the driving diaphragm is transmitted, a second housing for holding the driven film, valves performing open and close motions for sucking and discharging fluid into and from a cavity formed between the second housing and the driven film, and pipe conduits through which the fluid passes; a fixing unit for detachably fixing the driven unit to the driving unit; and a face of the displacement transmission member facing the driven film defines a vibration transmitting face of the driving diaphragm, and the vibration transmitting face of the driving diaphragm from which displacement of the driving diaphragm is transmitted to the driven film is convex when the driving diaphragm is not driven and a vibration transmitted face of the driven film to which the displacement of the driving diaphragm is transmitted is concave when the driving diaphragm is not driven, and the vibration transmitting face of the driving diaphragm contacts an entirety of the vibration transmitted face of the driven film when the second housing of the driven unit is completely fitted to a fitting portion of the first housing.