| 摘要 |
PURPOSE:To obtain a displacement generating device having simple structure and producing a large displacement by applying a constant voltage lower than the resisting field of a piezoelectric body having bimorph structure onto the plus side electrode, out of two electrodes sandwiching the piezoelectric body, and applying a constant voltage higher than the resisting field onto the minus side electrode. CONSTITUTION:Electrodes are taken out from three points; a drive electrode 2-2 sandwiched by piezoelectric boards 1-1, 2; an electrode 2-1 having polarizing direction on the plus side main face; an electrode 2-3 formed on the minus side main face. Output terminal of an amplifier 3 is connected to the drive electrode 2-2, while constant voltages +V0 and -V0 are connected through constant voltage source 4-1, 2 to the electrodes 2-1, 2-3 at the outside of the piezoelectric boards 1-1, 1-2 respectively. The constant voltage V0 is set lower than the resisting field of the piezoelectric material composing the piezoelectric boards 1-1, 2. By such arrangement, the driving voltage can be double and only one drive amplifier 3 is required. |
