| 摘要 |
PROBLEM TO BE SOLVED: To enable conversion ratio which is the ratio of an output voltage to an input voltage to be changed. SOLUTION: A piezoelectric transducer is divided into an input region and an output region. At least one of the regions is sub-divided into at least two sections (13-16), the sections adjacent in at least one section are mutually polarized inversely, and at least one of the sections is vertically polarized. |
