LAMINATE TYPE PIEZOELECTRIC ACTUATOR

• Main Authors: KOMEICHI SHIGEKI, HAYASAKA TAMIO
• Format: Patent
• Language: English
• Published: 27.06.1991
• Subjects: ELECTRICITY

PURPOSE:To enable a title actuator to follow up the expansion and contraction of a piezoelectric element by filling a small hole provided in a piezoelectric laminate a conductive resilient member instead of an external electrode. CONSTITUTION:Ag-Pd paste 3 is applied to a small hole 2 in one element 1 so as to extend to the edge of the small hole, while a blank part 5 of 3mmphi for example is provided on the other small hole 4 in a concentric member with the 1mmphi small hole 4, to which part 5 paste is applied. Further, for the rear of the element 1, a 3mmphi blank part 6 concentric with the small hole 2 on the rear side of the small hole 2 and Ag-Pd paste is printed on the rear side of the small hole 4 so as to extend to the edge of the small hole. The surface and the rear are reversed and alternately laminated and sintered under pressure. Then, a material where silver powder is blended in acryl nitrile butadiene rubber is heated until it becomes fluid, and pressed and filled into the small holes 2, 4 in a laminate sintered body via spaces. Since electrical connection between internal electrodes is achieved through a conductive resilient member 8 in such a manner, the conductive resilient member 8 can follow up the expansion and contraction of the piezoelectric element and hence the electrodes are prevented from being damaged.