| 摘要 |
Piezoelectric transformer comprising a piezoelectric body which is divided into a primary portion (2) and a secondary portion (3), whereby both the primary portion and the secondary portions are able to generate and transform piezoelectric vibrations in accordance with an AC-voltage fed to one portion while a transformed voltage is delivered from the other portion. The piezoelectric body is formed by a substantially oval or annular body which has been polarised substantially perpendicular to the peripheral direction. Therefore the annular transformer can operate at an increased frequency because it employs the thickness vibration instead of the peripheral vibration. As a result an increased field intensity is allowed because the field intensity is substantially proportional to the frequency. |
