LAMINATED TYPE PIEZOELECTRIC ELEMENT

• Main Author: KAWANAMI HIROSHI
• Format: Patent
• Language: English
• Published: 27.02.1990
• Subjects: ELECTRICITY

PURPOSE:To radiate heat generated by high speed driving to the outside so as to restrain the temperature rise of an element, and to decrease the lowering of displacement amounts attendant upon the temperature rise of the element by jutting out an internal electrode layer from the periphery of a piezoelectric material layer so as to put it in structure that an element itself has a radiation plate. CONSTITUTION:Cylindrical internal electrode layers 2A and 28 which are made in diameters larger than that of a piezoelectric material layer 1 so that they may jut out from the periphery of the piezoelectric material layer 1 are laminated alternately so as to constitute a laminated type piezoelectric element. External electrode layers 3A and 3B are connected to the internal electrode layers 2A and 2B, respectively, on alternate layers through holes which are opened alternately right and left in the internal electrode layers 2A and 2B. Voltage is applied to between the internal electrode layers 2A and 2B through the external electrode layers 3A and 3B. By making the internal electrode layers 2A and 2B of metallic foils, the heat generated in the piezoelectric material layer is transmitted efficiently to the internal electrode layer, and further by jutting out this internal electrode layer from the periphery of the piezoelectric material layer, it is made to effect the role of a radiation plate so as fo radiate the heat positively to the outside.