Piezoelectric microblower

A piezoelectric microblower comprising:

• a vibrating plate including a piezoelectric element and arranged to be driven in a bending mode by applying a voltage of a predetermined frequency to the piezoelectric element;
• and
• a blower body arranged to fix both ends or a periphery of the vibrating plate and to define a blower chamber between the blower body and the vibrating plate, an opening being provided in a portion of the blower body facing a central portion of the vibrating plate;
• wherein
• in a portion of the blower chamber spaced away from a peripheral edge of the blower chamber in a direction towards the opening and corresponding to the central portion of the vibrating plate, a partition is provided around the opening and a resonance space is defined inside of the partition;
• a size of the resonance space is set such that a driving frequency of the vibrating plate and a Helmholtz resonance frequency of the resonance space correspond to each other;
• and
• the partition is arranged so as to protrude from the blower body toward the vibrating plate or from the vibrating plate toward the blower body and is defined by a ring-shaped protrusion, an outer peripheral portion of the ring-shaped protrusion being disposed closer to a center of the blower chamber than the peripheral edge of the blower chamber.