| CPC B06B 1/0611 (2013.01) [B08B 3/12 (2013.01)] | 4 Claims |
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1. An ultrasonic-wave irradiation unit comprising;
a diaphragm having an irradiation surface that irradiates ultrasonic waves, and a non-irradiation surface located on the opposite side of the irradiation surface, with a bolt protruding from the non-irradiation surface;
a bolted Langevin-type ultrasonic transducer in which a transducer front plate is joined to the non-irradiation surface;
a front-side resonating member joined to the non-irradiation surface and having a bolt insertion hole through which the bolt is inserted; and
a rear-side resonating member is provided separately from the front-side resonating member at the tip of the bolt and is fastened and fixed to the bolt in a state where the front-side resonating member is held between the rear-side resonating member and the diaphragm,
wherein the front-side resonating members and the rear-side resonating members constitute multiple resonators capable of integral oscillation,
the side surface of the transducer front plate and the side surface of the front-side resonating member are connected to each other via a coupler that transmits the oscillation of the ultrasonic transducer to the resonators,
multiple resonators, together with multiple ultrasonic transducers, are arranged in a column, consisting of end-positioned resonators located at the ends of the column and mid-positioned resonator located in the middle of the column,
among the rear-side resonating members constituting the end-positioned resonators and the mid-positioned resonators, at least the rear-side resonating member constituting the end-positioned resonators is formed using a metal material with greater bending rigidity than the front-side resonating member.
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