| 摘要 |
PURPOSE:To utilize a longitudinal effect so as not to generate excessive tension, and to reduce driving power by mounting a stopper regulating motion to a lever transmitting the expansion operation of a piezo-electric body or an electrostrictive ceramic utilizing the longitudinal effect. CONSTITUTION:When voltage is applied to the external terminals 18, 19 of the piezo-electric or electrostrictive ceramic 10, elongation strain is generated to push up the lever 14, and a pin 16 is driven. The breakdown of the piezo-electric body 10 can be prevented without giving strong tensile force to the piezo-electric body by the excessive revolution of the lever 14 because the motion of the lever 14 is limited within a predetermined range by means of the stopper 17 at that time. With the piezo-electric body 10, electrodes 22, 23 are arranged alternately to a piezo-electric material, and it is brought to an extended state when the direction of polarization 26 and the direction of an electric field agree. The piezo-electric or electrostrictive ceramic 10 utilizing such a longitudinal effect is inserted between cap-shaped connecting mechanisms 11, 12, the degradation of strength in a joined section is prevented, and the ceramic is protected by means of the stopper 17. |
