| 摘要 |
The invention provides a piezoelectric transformer, comprising a driving section (A) having a plurality of driving electrodes (112a,112f) with a first piezoelectric member, contacted among said driving electrodes and polarized essentially in a vertical direction to said driving electrodes, and a power-generating section (B) having a power-generating electrode with a second piezoelectric member, contacted between said first piezoelectric member and a power-generating electrode and polarized in the different direction from that of said first piezoelectric member, characterized in that said piezoelectric transformer is provided with at least one additional polarizing electrode (113d). When the polarizing electrode is provided with the second piezoelectronic member, the second piezoelectric member can be polarized such that the degree of polarization between the driving section and the polarizing electrode closest to the driving section is lower than that of polarization between the power-generating electrode and the polarizing electrode closest to the driving section. Therefore, the generation of micro-cracks and the destruction of the piezoelectric member due to internal stress during polarization are suppressed. As a result, a piezoelectric transformer having superior mechanical strength is obtained. <IMAGE> |
