| 摘要 |
PURPOSE:To improve the pulse responsiveness by using a resonance barrel set into a case to separate the phase of an ultrasonic wave generated within the case and to reduce the acoustic interference. CONSTITUTION:An electromagnetic vibrator is bonded to the inside of a bottom face part 2a of a cylindrical case 2 to use the part 2a as a bimorph vibrator. The part 2a has a truncated cone section. A resonance ring 10 is provided to the inside of the case 2, and a resonance barrel is provided to the inner circumference of the ring 10. This barrel 11 separates the phase of a sound wave generated within the case 2 and reduces the acoustic interference. While a lead wire 7a soldered to the electrode surface of an electromagnetic vibrator is wired through a recess part 10a of the ring 10 via an elastic adhesive 13 along the inner side of the case 2. In such a constitution, the pulse responsiveness can be improved. |
