| 摘要 |
PURPOSE:To drive a motor with low voltage and miniaturize it by arranging an electric-mechanical energy conversion element such as a piezoelectric element plate, etc., at the optimum driving efficiency position. CONSTITUTION:A vibrator A is made, wherein piezoelectric element plates 3 and 4 are caught and fixed between metallic vibrating elastic bodies 1 and 2. In these piezoelectric element plates 3 and 4, negative and positive polarizing patterns are formed respectively on both sides with the diameter parts as boundaries, and when electric fields are applied in the same direction in thickness direction to both regions of the piezoelectric element plates 3 and 4, it is deformed as shown by the broken line in the figure. And the electric-mechanical energy conversion elements such as the piezoelectric element plates 3 and 4 are provided at the approximately the maximum positions of the elastic bodies 1 and 2 in driving or at the vicinity of the of the belly position of a vibration mode. Accordingly, even if one gives small displacement to the electric- mechanical energy conversion elements 3 and 4, the displacements in the elastic bodies are great. Hereby, it can be driven with low voltage, and miniaturization becomes possible. |
