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Multilayer piezoelectric device and ejection apparatus

A piezoelectric element and multilayer technology, which is applied in the field of multilayer piezoelectric elements and injection devices, can solve problems such as poor contact, failure to supply voltage, and disconnection of the external electrode 70, so as to achieve good durability, prevent disconnection, The effect of promoting interdiffusion

Active Publication Date: 2009-08-12
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the conventional multilayer piezoelectric actuator, when it is continuously driven under high electric field and high pressure for a long time, there is a problem that the external electrode 70 cannot follow the expansion and contraction of the multilayer body 53 and is disconnected. , or cause poor contact between the external electrode 70 and the internal electrode 52, the voltage cannot be supplied to a part of the piezoelectric body 51, and the displacement characteristic changes during driving.

Method used

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  • Multilayer piezoelectric device and ejection apparatus
  • Multilayer piezoelectric device and ejection apparatus
  • Multilayer piezoelectric device and ejection apparatus

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Experimental program
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Embodiment approach 1

[0086] Figure 1A It is a perspective view of a multilayer piezoelectric element (a multilayer piezoelectric actuator) according to Embodiment 1 of the present invention, Figure 1B is along Figure 1A Longitudinal sectional view of line A-A' in .

[0087] The multilayer piezoelectric actuator of the first embodiment, such as Figure 1A , 1B As shown in FIG. External electrodes 4 constitute. Specifically, the configuration is as follows: On the side surface on which the external electrodes 4 are formed, the ends of the internal electrodes 2 are covered with an insulator 3 every other layer, and the ends of the internal electrodes 2 not covered by the insulator 3 are connected with the external electrodes. 4 conduction. Also, the external electrodes 4 are made of a porous conductor having a three-dimensional network structure composed of a conductive material mainly composed of silver and glass, and lead wires 6 are connected to the respective external electrodes 4 . In ...

Embodiment approach 2

[0128] In the multilayer piezoelectric element (multilayer piezoelectric actuator) according to the second embodiment of the present invention, in the multilayer piezoelectric element according to the first embodiment, the external electrodes 4 and the internal electrodes 2 are configured as follows.

[0129] In the multilayer piezoelectric actuator according to Embodiment 2, the external electrodes 4 are made of a conductive material mainly composed of silver and glass, and the internal electrodes 2 include the conductive material and the piezoelectric material.

[0130] Also, let the weight ratio of silver in the conductive material of the internal electrode 2 be X (%), the weight ratio of silver in the internal electrode 2 including the conductive material and the piezoelectric material be Z (%), and the silver weight ratio in the external electrode 4 be Z (%). When the weight ratio is Y (%), each ratio is set so that X≧85 and 0.9≦X / Y≦1.1 are satisfied. This is for the foll...

Embodiment approach 3

[0166] The multilayer piezoelectric element (multilayer piezoelectric actuator) according to Embodiment 3 of the present invention is characterized in that Figure 1A , Figure 1B In the element shown in FIG. The silver ratio of the conductive material in the internal electrode 2 near the connection portion with the external electrode 4 is higher than the silver ratio of the conductive material in the internal electrode 2 inside the laminate 10 .

[0167] By making the silver ratio of the conductive material of the internal electrode 2 near the connection portion with the external electrode 4 larger than the silver ratio of the conductive material in the internal electrode 2 inside the laminate 10, the main content of the conductive material of the external electrode 4 can be increased. Since silver, which is a component, is close to the concentration of silver in the conductive material of the internal electrodes 2, the bonding between the external electrodes 4 and the inter...

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Abstract

A multi-layer piezoelectric element having excellent durability in which the amount of displacement does not change even after subjecting to continuous operation over a long period of time under a high voltage and a high pressure is provided. The multi-layer piezoelectric element comprises a stack formed by stacking piezoelectric layers and internal electrodes alternately one on another and external electrodes formed on a first side face and on a second side face of the stack, wherein one of the adjacent internal electrodes is connected to the external electrode formed on the first side face and the other internal electrode is connected to the external electrode formed on the second side face. The external electrode is composed of the porous electric conductor which comprises conductive material and glass and is configured to a three-dimensional network structure.

Description

[0001] This application is a divisional application based on the patent application No. 200480027657.1, the title of the invention is "Laminated Piezoelectric Element", and the filing date is September 22, 2004. technical field [0002] The present invention relates to a multilayer piezoelectric element and an injection device. Multilayer piezoelectric elements such as actuators and injection devices. Background technique [0003] Conventionally, a multilayer piezoelectric actuator in which piezoelectric bodies and internal electrodes are alternately laminated is known as a multilayer piezoelectric element. In the multilayer piezoelectric actuator, it is classified into two types: the simultaneous sintering type and the stacked type that alternately laminate the piezoelectric electromagnetic device and the internal electrode plate. From the perspective of lower voltage and lower manufacturing cost, The multilayer piezoelectric actuator of the simultaneous sintering type is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/083H01L41/047F02M51/00F02M51/06H02N2/04H01L41/187H01L41/22H01L41/293H01L41/297H01L41/39H02N2/00
Inventor 中村成信
Owner KYOCERA CORP
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