LAMINATED PIEZOELECTRIC ELEMENT, INJECTOR EQUIPPED WITH THE SAME AND FUEL INJECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a laminated piezoelectric element which is stably driven without removing the solder even when continuously driven under high electric field and high pressure for a long period of time, and to provide an injector equipped with the laminated piezoelectric element and a fuel injection system.

SOLUTION: A laminated piezoelectric element 1 includes: a laminated body 7 formed by laminating a piezoelectric layer 3 and an internal electrode layer 5; an external electrode 8 joined to a side surface of the laminated body 7 and electrically connected to the internal electrode layer 5; and a lead 9 electrically connected to the external electrode 8 via the solder 10. A plurality of voids 11 are provided inside the solder 10.

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