| 摘要 |
PURPOSE: To shape a sound field, to perform line focusing (prolong the focal depth) and to easily manufacture the ultrasonic probe of high resolution usable in a relatively simple electric circuit by using a piezoelectric element for which polarization intensity is weighted on a Bessel function. CONSTITUTION: A full-surface electrode 2 is formed on one surface of piezoelectric ceramics 1, multiple ring-like division electrodes 3 are formed on the other surface and this piezoelectric element 5 is obtained. Then, the division electrodes 3 of the piezoelectric element 5 are polarized to a ratio similar to the Bessel function. After connecting the division electrodes 3 of the piezoelectric element 5 obtained in such a manner by electrically conductive resin, fixing to a housing through an insulation cylinder is performed so as to make the division electrodes 3 be on an inner side. Then, connection is performed from the full-surface electrode 2 on a surface side to the housing by using the electrically conductive resin, an acoustic matching layer is formed on the surface of the full-surface electrode 2 on the surface side, a back surface load material is cast to the side of the division electrodes 3 divided in a ring shape and hardened and the transducer part of the ultrasonic probe is manufactured. |
