| 摘要 |
PURPOSE:To realize the titled displacement generator, which generates a constant quantity of displacement without depending on temperature, at a low cost and high reliably by a method wherein a capacitor, whose code of the temperature coefficient of electrostatic capacity is different from that of the temperature coefficient of electrostatic capacity of a bimorph piezoeletric-element, is connected to the bimorph piezoelectric-element in series. CONSTITUTION:A bimorph piezoelectric-element 3 and a capacitor 2, whose code of the temperature coefficient of electrostatic capacity is different from that of the temperature coefficient of electrostatic capacity of the bimorph piezoelectric-element 3, have been mutually connected in series in such a condition as to be impressed an AC driving voltage. The driving voltage is impressed on the bimorph piezoelectric-element 3 through the intermediary of a capacitor 2 for compensation connected to the bimorph piezoelectric-element 3 in series by an AC electric power source 1 whose internal impedance is sufficiently smaller than the impedance of the bimorph piezoelectric-element 3. The bimorph piezoelectric-element 3 shall be the one laminatedly made of two sheets of plate material 3a and 3b, which are a parallel connection type and consisted of piezoelectric- material, for example. The polarizing direction thereof is the thickness direction of the plate material and the polarizing direction shall be the same direction as that of the material.
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