| 摘要 |
PURPOSE:To provide a multilayer piezoelectric element wherein its internal electrodes are connected surely every two layers with its external electrode, and defective conduction and defective insulation can be prevented. CONSTITUTION:A conductive protrusive part 16 is formed in the end part of an internal electrode 12 exposed every two layers to the side surface of a multilayer piezoelectric element wherein piezoelectric materials and the internal electrodes are superimposed on each other alternately. Further, an insulation layer 18 made of a thermosetting resin or ultraviolet-rays-setting resin is so formed as to be applied to all the piezoelectric materials in the stacking direction of the piezoelectric element. This insulation layer 18 comprises a set part present in the part opposed to the conductive protrusive part 16 and an unhardened part present in the part sandwiched between the conductive protrusive parts 16. Then, a conductive film 13 is thermo-compression-bonded to the insulation layer 18. Thereby, conductive particles 17 included in the conductive film 13 are contacted with a copper foil 15 to be changed into the external electrode of the piezoelectric element. Concurrently, the conductive particles 17 break through the unhardened part, and as a result, the internal electrodes 12 present every two layers are connected electrically with the copper foil 15 via the conductive film 13 and the insulation layer 18.
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