| 摘要 |
PURPOSE:To obtain a piezoelectric element with low development frequency of discharge breakdown or fatigue failure by making spontaneous polarization differ in size for dispersing strain concentrated on electrode boundary part. CONSTITUTION:The piezoelectric element 1 before being impressed with electrode is impressed with the electrode fitted with a conductive rubber in almost the same diameter as that of the piezoelectric element 1. Next, the element 1 is polarized by impressing the other electrode fitted with another conductive rubber in smaller diameter than that of the element 1 to be polarized. Later, the element 1 is polarized by impressing the other electrode fitted with the other conductive rubber in further smaller diameter than that of the element 1 to be polarized for the size of spontaneous polarization 4 to be notably made different. Finally, an electrode 2 is to be formed on the title piezoelectric element 1. |
