| 摘要 |
PURPOSE:To perform fine angular control based on application voltage by employing a bimorph type actuator where two piezoelectric elements are sticked around a central electrode, i.e., a metal plate, then applying voltage onto the two piezoelectric elements and causing rotary motion of the rotary shaft. CONSTITUTION:Piezoelectric elements Q, D are polarized electrically in reverse direction. Central symbol P represents a resilient metallic board where Q, D, P are sticked to constitute a kind of spiral piezoelectric bimorph actuator. The direction of electrical polarization is set such that the piezoelectric element D elongates and the piezoelectric element Q contracts upon application of voltage between the anode X and cathode X' and the rotary shaft B rotates clockwise. When such principle is employed, rotary direction and angle of the rotary shaft B can be controlled by varying the magnitude and the direction of voltage to be applied between X and X'. |
