Kyocera Corporation

Susumu Ono

Shigenobu Nakamura

Takeshi Okamura

Masaki Terazono

Katsushi Sakaue

Koichi Nagasaki

Hirotaka Tsuyoshi

Hideki Uchimura

Takeshi Kato

Takaaki Hira

A multi-layer piezoelectric element of high durability wherein external electrodes do not peel off the surface of a stack even when operated continuously over a long period of time under a high electric field and a high pressure, a method for manufacturing the same and an injection apparatus using the same are provided. The multi-layer piezoelectric element comprises a stackconsisting of a plurality of piezoelectric layersand a plurality of metal layerswhich are stacked alternately one on another and external electrodes (covering member)that cover at least a part of the side faces of the stack, wherein at least one metal layeramong the plurality of metal layersis a porous metal layerwhich has more voids than the metal layersthat adjoin the metal layeron both sides thereof in the stacking direction, and a part of the external electrodesinfiltrates between two piezoelectric layerswhich adjoin the porous metal layerin the stacking direction.

Multi-layer piezoelectric element and injection apparatus using the same

A multilayer piezoelectric element is provided which has excellent durability even if it is continuously driven for a long period of time under high temperature and high humidity. The multilayer piezoelectric element has a laminated body that a plurality of piezoelectric layers are laminated through an internal electrode interposed therebetween, in which the internal electrode, a dummy electrode spaced apart and electrically insulated from the internal electrode, and an insulating part between the dummy electrode and the internal electrode are arranged between two adjacent piezoelectric layers. A porous part having a larger number of voids than the internal electrode is formed at positions opposed in the laminating direction to the internal electrode, the dummy electrode and the insulating part through the piezoelectric layer interposed therebetween, respectively.

Multilayer piezoelectric element, injection device and fuel injection system using the same, and method of manufacturing multilayer piezoelectric element

In order to provide a multi-layer electronic component in which the occurrence of delamination between the ceramic layer and the internal electrode is restricted and a method for manufacturing the same, the multi-layer electronic component of the present invention comprises a stack formed by stacking piezoelectric layers and internal electrodes one on another alternately and a pair of external electrodes formed on two opposing side faces of the stack, wherein the internal electrode consists of a first internal electrode connected to the external electrode formed on one of the two side faces and a second internal electrode located between the first internal electrode and connected to the external electrode formed on the other one of the two side faces, and wherein the internal electrodes and the piezoelectric layers are faced in proximity so that a space between them is 2 &#x3bc;m or less over an area occupying 50% or more of the active region where the first internal electrode and the second internal electrode oppose each other.

Multi-layer electronic component and method for manufacturing the same, multi-layer piezoelectric element

Laminated piezoelectric actuator

Growing community of inventors

Kirishima, Japan

Susumu Ono