Ultrasonic-wave irradiation unit

An ultrasonic-wave irradiation unit comprising:

• a diaphragm having an irradiation surface that emits ultrasonic waves and a non-irradiation surface located on the opposite side of the irradiation surface, with a plurality of bolts protruding from the non-irradiation surface;
• and
• a plurality of transducer units, each comprising a plurality of ultrasonic transducers, resonators, and a connecting plate;
• wherein the resonators are arranged between the plurality of ultrasonic transducers;
• wherein the connecting plate mechanically couples the plurality of ultrasonic transducers and the resonators and transmits the vibrations of the plurality of ultrasonic transducers to the resonators;
• wherein the connecting plate has alternating wide portions and narrow portions formed by having peaks and valleys along both side edges, and a plurality of bolt insertion holes are formed through the center of each of the wide portions to allow the bolts to pass through;
• wherein adjacent connecting plates are arranged in a staggered manner such that the peaks of one plate fit into the valleys of the other plate in close proximity;
• wherein the plurality of ultrasonic transducers and resonators are fastened and secured to the bolts protruding through the bolt insertion holes of the connecting plates, and a plurality of transducer units are installed on the non-irradiation surface side.