| 摘要 |
PURPOSE:To protect the other piezoelectric element against breakdown by additionally disposing a displacement regulating section between two piezoelectric elements and setting the stiffness at the displacement regulating section such that an angular displacement takes place at a displacement part, with hinges at the opposite ends of the other piezoelectric element as fulcrums, when a voltage is applied only on one piezoelectric element. CONSTITUTION:A rod type displacement regulating section 4 is disposed between piezoelectric elements 2, 3 while being secured through hinge sections 4a, 4b at the opposite ends to the surface 1a of a displacement part 1 and the surface 5a of a fixed part 5. The piezoelectric element 3 elongates upon application of voltage but the piezoelectric element 2 does not elongate because no voltage is applied thereon. Consequently, an angular displacement takes place between the surface 1a of the displacement part 1 and the surface 5a of the fixed part 5. Since stiffness at the displacement regulating section 4 is set in such a way that an angular displacement takes place between the surfaces 1a, 5a with hinges 6a, 6b secured to the piezoelectric element 2 as fulcrums, tensile force is not applied on the piezoelectric element 2 which is thereby protected against breakdown. |
