Patent ID: 7972124

Claim:
A piezoelectric micro-blower comprising: a blower body; a diaphragm having an outer periphery fixed to the blower body and including a piezoelectric element; and a blower chamber provided between the blower body and the diaphragm; wherein the diaphragm is arranged to be bent in response to application of a voltage to the piezoelectric element so as to transport a compressible fluid; the piezoelectric micro-blower further comprises: a first wall of the blower body, the first wall and the diaphragm defining the blower chamber therebetween; a first opening provided in a section of the first wall that faces an approximate center of the diaphragm, the first opening being arranged to provide communication between an inside and an outside of the blower chamber; a second wall of the blower body provided opposite the blower chamber with the first wall therebetween and separated from the first wall by a distance; a second opening provided in a section of the second wall that faces the first opening; at least one passage-forming member disposed between the first wall and the second wall of the blower body and including a central opening disposed between and facing the first opening and the second opening; at least one inflow passage provided in the at least one passage-forming member, extending outwardly from the central opening and including an outer end in fluid communication with an outside of the blower body and an inner end in fluid communication with and connected to the central opening; and a plurality of branch passages provided in the at least one passage-forming member, each of the plurality of branch passages including an open end in fluid communication with and connected to an intermediate section of the at least one inflow passage disposed between the inner end and the outer end of the at least one inflow passage, and a closed end opposite to the open end and spaced away from the at least one inflow passage.