Invention Grant
US08405278B2 Multi-layer piezoelectric element, ejection device having the element, and fuel ejection system 有权
多层压电元件,具有元件的喷射装置和燃料喷射系统

  • Patent Title: Multi-layer piezoelectric element, ejection device having the element, and fuel ejection system
  • Patent Title (中): 多层压电元件,具有元件的喷射装置和燃料喷射系统
  • Application No.: US12740102
    Application Date: 2008-10-22
  • Publication No.: US08405278B2
    Publication Date: 2013-03-26
  • Inventor: Takeshi Okamura
  • Applicant: Takeshi Okamura
  • Applicant Address: JP Kyoto
  • Assignee: Kyocera Corporation
  • Current Assignee: Kyocera Corporation
  • Current Assignee Address: JP Kyoto
  • Agency: DLA Piper LLP (US)
  • Priority: JP2007-280308 20071029
  • International Application: PCT/JP2008/069092 WO 20081022
  • International Announcement: WO2009/057489 WO 20090507
  • Main IPC: H01L41/083
  • IPC: H01L41/083
Multi-layer piezoelectric element, ejection device having the element, and fuel ejection system
Abstract:
Provided is a multi-layer piezoelectric element in which the amount of the positional displacement can be suppressed even when continuous driving is performed for a long time under high electrical field and high pressure, and which may have a good durability. The laminated piezoelectric element comprises a stacked body in which piezoelectric layers and metal layers are stacked alternately one on another. The metal layers comprise internal electrodes and a low-rigidity metal layer which has rigidity lower than those of the piezoelectric layer and the internal electrode. The low-rigidity metal layer comprises a plurality of metal parts isolated from each other via voids, and a covering layer which covers at least a part of the metal parts.
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