| 摘要 |
PURPOSE:To prevent the structural weakness and the enlargement of a bimorph element and simplify the electrode structure inserted between a piezoelectric element single body by utilizing the transversal oscillation of a piezoelectric element in a thickness direction to drive and control an object to be driven with respect to an actuator which drives and controls the head of an information recording and reproducing device or the like. CONSTITUTION:The piezoelectric element single bodies 31-36 are so laminated that their polarization directions are different from one another by 180 deg.. Electrode layers 41-47 are provided between the piezoelectric element single bodies 31-36 and at the outside faces of the piezoelectric element single bodies 31 and 36. When a voltage of such potential is impressed from a voltage amplifier 24 to a laminated piezoelectric device 23a to expand this device 23a in the thickness direction, and a voltage of such potential is impressed to a laminated piezoelectric device 23b from a voltage amplifier 25 to compress the device 23b in the thickness direction. Even if some external force is applied to a head 22, the position of the head 22 is not deviated considerably because the outsides of both piezoelectric devices 23a and 23b are held firmly by both legs 21a and 21b of a frame body 20 formed with a member of high mechanical strength. |
