| 摘要 |
PURPOSE:To prevent the life of an element from deteriorating by the temperature rise of the element due to the heat generation of the element by repeated drive or the temperature rise of the element by the influence of heat at high temperature. CONSTITUTION:In an electrostrictive effect element, where the element 1 of a multilayer body wherein electrostrictive ceramic layers and inner electrodes are stacked alternately is sealed with an airtight terminal 2, a thin metallic case 6, and a metallic member 7, a thick case 9 is made through sliding members such as O-rings 8a and 8b, etc., around the thin metallic case 9. And, through holes 10a and 10b are made in the side face of the thick case 9, and a heat exchanger is caused to flow on the side face of the boundary between the thin metallic case 6 and the thick case 9, whereby the temperature rise by the heat generation of the element and the temperature rise of the element by the ambient heat are prevented and the life of the element is prevented from shortening. |
