| 摘要 |
There are provided a multi-layer piezoelectric element capable of suppressing separation of an external electrode plate, as well as an injection device and a fuel injection system provided with the same. The invention includes: a stacked body (6) comprising an active section (4) composed of a stack of piezoelectric layers (2) and internal electrode layers (3), and inactive sections (5) disposed at opposite ends in a stacking direction of the active section (4); an electrically-conductive bonding material (7) disposed on a side surface of the stacked body (6), the electrically-conductive bonding material (7) extending from the active section (4) to the inactive sections (5); and an external electrode plate (8) attached, through the electrically-conductive bonding material (7), to the side surface of the stacked body (6), a spacing between a side surface of at least one of the inactive sections (5) disposed at the opposite ends of the active section (4) and the external electrode plate (8) being wider than a spacing between a side surface of the active section (4) and the external electrode plate (8), and the electrically-conductive bonding material (7) situated between the side surface of at least one of the inactive sections (5) disposed at the opposite ends and the external electrode plate (8) being larger in thickness than the electrically-conductive bonding material (7) situated between the side surface of the active section (4) and the external electrode plate (8). |
