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    PIEZOELECTRIC TRANSFORMER WITH HIGH EFFECTIVE ELECTROMECHANICAL COUPLING FACTORS
    112.
    发明公开
    PIEZOELECTRIC TRANSFORMER WITH HIGH EFFECTIVE ELECTROMECHANICAL COUPLING FACTORS 审中-公开
    与高效的机电耦合系数压电变压器

    公开(公告)号：EP2742545A1

    公开(公告)日：2014-06-18

    申请号：EP12745481.7

    申请日：2012-08-03

    申请人： Noliac A/S

    发明人： MEYER, Kaspar Sinding

    IPC分类号： H01L41/107

    CPC分类号： H01L41/107

    摘要： The present invention relates to a piezoelectric transformer (100) comprising an elongate piezoelectric ceramic body (102) adapted to operate in fundamental thickness mode. The elongate piezoelectric ceramic body (102) comprises a central input or primary section (112) coupled to adjacently arranged first (114) and second (116) output sections. High power conversion efficiency and zero-voltage switching capability is achieved by providing a primary side effective electromechanical coupling factor k
    eff_P , which is larger than a secondary side electromechanical coupling factor, k
    eff_S .

    PIEZOELECTRIC CERAMIC COMPOSITION AND PIEZOELECTRIC ELEMENT MADE BY USING THE SAME
    118.
    发明公开
    PIEZOELECTRIC CERAMIC COMPOSITION AND PIEZOELECTRIC ELEMENT MADE BY USING THE SAME 有权
    PIEZOELEKTRISCHE KERAMIKZUSAMMENSETZUNG UND PIEZOELEKTRISCHES ELEMENT DARAUS

    公开(公告)号：EP2295389A1

    公开(公告)日：2011-03-16

    申请号：EP09773120.2

    申请日：2009-06-22

    申请人： NGK Spark Plug Co., Ltd.

    发明人： YAMAZAKI, Masato ,  MATSUOKA, Takayuki ,  YAMAGIWA, Katsuya ,  MITSUOKA, Takeshi

    IPC分类号： C04B35/46 ,  H01L41/08 ,  H01L41/09 ,  H01L41/107 ,  H01L41/187 ,  H01L41/22 ,  H01L41/24 ,  H03H9/17

    CPC分类号： C04B35/475 ,  C04B2235/3201 ,  C04B2235/3241 ,  C04B2235/3275 ,  C04B2235/604 ,  H01L41/1878 ,  H03H9/176

    摘要： The present invention provides a piezoelectric ceramic composition having a high thermal resistance and a high piezoelectric distortion constant and a piezoelectric element using the piezoelectric ceramic composition. The piezoelectric ceramic composition of the present invention contains Na, Bi, Ti, Cr and O, wherein the content ratio of Na, Bi, Ti and Cr in terms of oxides thereof falls within the following composition range: a Na 2 O- b Bi 2 O 3 - c TiO 2 - d CrO where a, b, c and d are mole fractions; 0.030 ≤ a ≤ 0.042; 0.330 ≤ b ≤0.370; 0.580 ≤ c ≤ 0.620; 0 d ≤ 0.017; and a + b + c + d = 1. The piezoelectric ceramic composition preferably has a main crystal phase of bismuth layer-structured ferroelectric, more preferably Na 0.5 Bi 4.5 Ti 4 O 15 crystal. The piezoelectric element of the present invention includes a piezoelectric body formed of the piezoelectric ceramic composition and at least a pair of electrodes held in contact with the piezoelectric body.

    摘要翻译： 本发明提供一种具有高热阻和高压电变形常数的压电陶瓷组合物和使用压电陶瓷组合物的压电元件。 本发明的压电陶瓷组合物含有Na，Bi，Ti，Cr和O，其中Na，Bi，Ti和Cr的氧化物含量在下列组成范围内：Na 2 O-b Bi 其中a，b，c和d为摩尔分数; 0.030‰¤‰‰0.042; 0.330‰¤b‰¤0.370; 0.580‰¤‰¤0.620; 0