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Layered piezoelectric element and injection device using the same

A piezoelectric element, laminated technology, applied in the manufacture/assembly of fuel injection devices, piezoelectric/electrostrictive devices, electrical components, etc., can solve problems such as changes in displacement characteristics, to prevent the reduction of displacement characteristics, The effect of improving the bonding strength

Active Publication Date: 2009-12-30
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in conventional multilayer piezoelectric actuators, there is a problem that, when continuously driven for a long time under high electric field and high pressure, due to the expansion and contraction of the multilayer body, there is a problem that the junction between the side surface of the multilayer body and the external electrode occurs. Stress causes a part of the external electrode to peel off from the side of the laminate, no voltage is supplied to a part of the piezoelectric body, and the displacement characteristic changes during driving.

Method used

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  • Layered piezoelectric element and injection device using the same
  • Layered piezoelectric element and injection device using the same
  • Layered piezoelectric element and injection device using the same

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no. 1 Embodiment approach

[0098] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. figure 1 It is a perspective view showing the multi-layer piezoelectric element related to the first embodiment of the present invention. figure 2 for figure 1 The A-A line profile in. image 3 It is an enlarged cross-sectional view of the joint portion between the external electrode 4 and the side surface of the laminated body 10 according to this embodiment.

[0099] like figure 1 and figure 2 As shown, the multi-layer piezoelectric element of this embodiment has a laminated body 10 in which a plurality of piezoelectric layers 1 and a plurality of metal layers 2 are alternately stacked, and each of the A pair of external electrodes (covering members) 4, 4' are electrically connected to the end of the metal layer 2 via an alternate layer. Lead wires 6 are respectively fixed to the external electrodes 4, 4' by solder or the like. These lead wi...

no. 2 Embodiment approach

[0121] Figure 4 It is a cross-sectional view showing a related multi-layer piezoelectric element according to the second embodiment of the present invention. Figure 5 It is an enlarged cross-sectional view of the joint portion between the external electrode 4 and the side surface S of the laminated body 10 in the second embodiment. like Figure 4 and Figure 5 As shown, in the multi-layer piezoelectric element related to the second embodiment, several metal layers 2a' among the plurality of metal layers 2 have gaps compared with the metal layers 2b on both sides adjacent to the metal layer 2a'. 2d more. In order to compare the amount of voids 2d, for example, the porosity of each metal layer can be measured. In this embodiment, the metal layer 2a' has a higher porosity than the metal layers 2b on both sides adjacent to the metal layer 2a'. Hereinafter, the metal layer 2a' may be referred to as "porous metal layer 2a'".

[0122] Figure 6 It is an enlarged cross-sectio...

no. 3 Embodiment approach

[0133] Figure 8 It is a cross-sectional view showing a related multi-layer piezoelectric element according to the third embodiment of the present invention. like Figure 8 As shown, in this element, a pair of external electrodes 4, 4' are formed on the side surface S of the laminated body 10 in this element, and in a part of the region between the two piezoelectric layers 1, a hole for allowing a part of one external electrode 4 to enter is formed. The insertion portion 4a has an insertion portion 4a' into which a part of the other external electrode 4' enters, in another partial region between the piezoelectric layers 1 similar to this. By doing so, it is possible to prevent both external electrodes from being peeled off from the side surfaces of the laminate, so that the durability of the device can be further improved. In addition, compared with the case where the piezoelectric body interlayer into which a part of one external electrode enters is different from the piezo...

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Abstract

It is possible to provide a layered piezoelectric element having a high durability. That is, even when continuously driven under a high electric field and a high pressure for a long period of time, an external electrode is not peeled off the layered body surface. A manufacturing method of the layered piezoelectric element and an injection device are also provided. The layered piezoelectric element includes: a layered body (10) having a plurality of piezoelectric layers (1) and a plurality of metal layers (2) alternately layered; and an external electrode (coating member) (4) covering a part of the side surface of the layered body (10). At least one metal layer (2a) of the plurality of metal layers (2) is a porous metal layer (2a) having more voids than the metal layer (2b) adjacent to the metal layer (2a) in the layering direction. A part of the external electrode (4) protrudes between the two piezoelectric layers (1, 1) adjacent in the layering direction with respect to the porous metal layer (2a).

Description

technical field [0001] The present invention relates to a laminated piezoelectric element installed in a fuel injection device of an automobile engine, etc., and an injection device using the same. Background technique [0002] Figure 28 It is a perspective view showing a conventional multi-layer piezoelectric element. Figure 29 It is an enlarged cross-sectional view showing a joint portion between a side surface of a laminate and an external electrode in the multi-layer piezoelectric element. like Figure 28 and Figure 29 As shown, this multilayer piezoelectric element is constituted by a multilayer body 110 and external electrodes 104 formed on a pair of side surfaces facing each other. [0003] The laminated body 110 is formed by alternately laminating piezoelectric layers 101 and metal layers 102 , but the metal layers 102 are not formed on the entire main surface of the piezoelectric layer 101 but form a so-called partial electrode structure. That is, in this lami...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/083F02M51/00F02M51/06H01L41/09H01L41/187H01L41/22H02N2/00H10N30/50H10N30/057H10N30/20H10N30/853
Inventor 中村成信小野进加藤刚长崎浩一
Owner KYOCERA CORP
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