| 摘要 |
PURPOSE:To improve the efficiency and endurability, by deforming an elastic member interposed between a piezoelectric element and a driving head in parallel with the vibrating shaft by vibration and vibrating the driving head in accordance therewith. CONSTITUTION:A piezoelectric element 2 of a piezoelectric driving unit is fixed to a mount 5 with a clamping bolt. A driving head 21 having rigidity is fixed and supported to an end face of this piezoelectric element 2 through an elastic member 20. This elastic member 20 is formed of a flat board upper spring member, whose center is fixed to the mount 5 as a base 22 with the above bolt together with the piezoelectric element 2, The elastic member 20 has an elastic section 23 extended in the orthogonal direction (Y-axis) to the direction of vibration of the piezoelectric element 2 with the base 22 as the center. Furthermore, the elastic member 20 has a supporting section 24. To the driving head 21 XZ-axis is formed trapezoidal. The edge surface is let to be a driving surface 26. Except the fixed section, a recessed section 28 is thus provided to all the area of the surface facing the elastic member 20 and by forming a void, no free deformation of the elastic member 20 is precluded. |
