Laminated piezoelectric element for piezoelectric actuator for fuel injection device of internal combustion engine, has slot formation layers whose thickness is greater than double diameter of non-slot formation layer thickness

摘要

The element (1) has a ceramic layer (19) comprising multiple slots (15), via which side surfaces (195a, 195b) of the ceramic layer with a predetermined depth is inserted, where the slots extend in a circumferential direction of the ceramic layer. Piezoelectric ceramic layers (2) comprise ceramic slot formation layers (25), via which the slots are formed, and ceramic non-slot formation layers, where thickness of the ceramic slot formation layers is greater than double the diameter of the thickness of the non-slot formation layers.