| 摘要 |
An ultrasonic transducer capable of radiating ultrasonic waves with a high sound pressure and having excellent reverberation characteristics is provided. An ultrasonic transducer 10 includes a cylindrical cap member 12 with a bottom. A piezoelectric element 14 is bonded to the inner side of a bottom portion 12a of the cap member 12 using a conductive adhesive or the like. An inner frame 16 composed of a material having an acoustic impedance higher than that of the cap member is fitted into the cap member 12 so as to be in close contact with a side portion 12b, including the end portion, of the cap member 12. Through-holes 22 are formed in the side portion of the inner frame 16. Lead wires 24a and 24b are connected to the piezoelectric element 14 and the inner frame 16, respectively. A sound absorber 26 and a damper 28 are inserted into the inner frame 16. The damper 28 is in direct contact with the side portion 12a of the cap member 12 via the through-holes 22 of the inner frame 16. |
