| 摘要 |
PURPOSE:To obtain a laminate type piezoelectric substance having correct expansion quantity by a method wherein metal electrodes are compressed previously by making pressure to act to the surface and the rear surface of a piezoelectric element being used as a spill valve to be arranged facing to compression space of a Diesel injection pump. CONSTITUTION:Screen printing of an electrode material consisting of silver paste, etc.,is performed to the surface and the rear surface of a piezoelectric element 101, and drying and printing are performed. At this time, load of the degree of the maximum 1500kg is made to act to the edge surface of a laminate type piezoelectric substance 100, and load of the degree of 3000kg, which is pressure of double of the maximum load thereof, is applied for l-l0sec to metal electrodes 103 completed with drying and printing. The metal electrodes 103 are formed on both the surfaces of the piezoelectric element 101 in such a way, and by laminating the plural number of sheets of the piezoelectric elements 101 thereof, a laminate type piezoelectric substance 100 is formed. |
