| 摘要 |
PURPOSE:To obtain an ultrasonic probe which causes no position shift in transmitting and receiving waves, with high transmitting and receiving sensitivity, and also has a wide band characteristic by using different kinds of piezoelectric bodies for transmission and reception use, and laminating these piezoelectric bodies. CONSTITUTION:On the back of a receiving piezoelectric body 1, a transmitting piezoelectric body 2 whose acoustic impedance is larger than that of said body is stuck, and also, on its rear side, a packing material 3 whose acoustic impedance is larger than that of the piezoelectric body 2 is stuck. A thickness of the piezoelectric body 1 and 2 is selected to about 1/4 wavelength against a frequency of an ultrasonic wave to be transmitted and received. Also, an electrode 4 is attached to both faces of both the piezoelectric bodies by means of vapor deposition, plating, etc. Both the electrodes are made to adhere by inserting an electric insulating layer 5 between them. As for a combination of the piezoelectric body 1 and 2, titanic acid zirconic acid lead and polyfluorovinylidene, titanic acid zirconic acid lead and a complex matter, etc. are suitable. |
