| 摘要 |
PURPOSE:To realize broad band characteristics, by forming a unidirectional transducer from a 3-phase electrode and a lead electrode provided on a piezoelectric substrate. CONSTITUTION:Electrodes 14A, 14B, 14C having three phases of 0 deg., 120 deg. and 240 deg. are formed on the surface of an elastic substance substrate 13. Lead electrodes 15B, 15C provided on the surface of the substrate 13 are connected respectively to the electrodes 14B, 14C. A dielectric film 16 is formed on the surface of the substrate 13 so as to cover the electrodes 14B, 14C, and the lead electrode 15A provided along the surface of the film 16 is connected to the electrode 14A. Power feeding terminals 17A-17C to supply each phase signal are connected to the lead electrodes. Thus, the unidirectional transducer is formed and the broad band characteristics are realized. |
