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    Laminated ceramic capacitor
    1.
    发明授权
    Laminated ceramic capacitor 有权

    公开(公告)号：US06411495B1

    公开(公告)日：2002-06-25

    申请号：US09776402

    申请日：2001-02-02

    申请人： Nobuyuki Wada ,  Jun Ikeda ,  Takashi Hiramatsu ,  Yukio Hamaji

    发明人： Nobuyuki Wada ,  Jun Ikeda ,  Takashi Hiramatsu ,  Yukio Hamaji

    IPC分类号： H01G410

    摘要： The present invention provides a dielectric ceramic composition whose electrostatic capacity has an excellently low temperature dependence; which can be fired in a reducing atmosphere; and which is advantageously used in a laminated ceramic capacitor having an internal electrode formed of a base metal such as nickel or nickel alloy. The dielectric ceramic composition is represented by the following formula: {Ba1-xCaxO}mTiO2+&agr;MgO+&bgr;MnO, wherein 0.001≦&agr;≦0.05; 0.001≦&bgr;≦0.025; 1.000

    Dielectric ceramic, method for producing the same, laminated ceramic electronic element, and method for producing the same
    2.
    发明授权
    Dielectric ceramic, method for producing the same, laminated ceramic electronic element, and method for producing the same 有权
    介电陶瓷，其制造方法，层叠陶瓷电子元件及其制造方法

    公开(公告)号：US06205015B1

    公开(公告)日：2001-03-20

    申请号：US09233335

    申请日：1999-01-20

    申请人： Nobuyuki Wada ,  Jun Ikeda ,  Takashi Hiramatsu ,  Yukio Hamaji

    发明人： Nobuyuki Wada ,  Jun Ikeda ,  Takashi Hiramatsu ,  Yukio Hamaji

    IPC分类号： H01G406

    CPC分类号： H01G4/1227 ,  C04B35/4682

    摘要： A dielectric ceramic which exhibits an excellent electrostatic capacity-temperature characteristic; which allows use of a base metal such as nickel; which can be fired in a reducing atmosphere; and which is suitable for constituting a dielectric ceramic layer of a laminated ceramic electronic element such as a laminated ceramic capacitor; is obtained by firing barium titanate powder in which the c-axis/a-axis ratio in the perovskite structure is in the range of about 1.003 to 1.010 and the amount of OH groups in the crystal lattice is about 1 wt. % or less. The barium titanate powder a starting material preferably has a maximum particle size of about 0.5 &mgr;m or less and an average particle size of about 0.1-0.3 &mgr;m, and individual particles of the barium titanate powder comprise a low-crystallinity portion 21 and a high-crystallinity portion 23, with the diameter of the low-crystallinity portion being less than about 0.65 times the particle size of the powder. When sintered, the powder satisfies the ratio of (average grain size of the fired dielectric ceramic)/(average particle size of barium titanate powder serving as a starting material), which is referred to as R, of about 0.90-1.2, to thereby suppress considerable grain growth. A laminated ceramic electronic element including a laminate of a plurality of layers of the above-mentioned dielectric ceramic, as well as a method for producing the same, is described.

    摘要翻译： 表现出优异的静电电容 - 温度特性的介电陶瓷; 其允许使用诸如镍的贱金属; 可在还原气氛中燃烧; 适用于层叠陶瓷电容器等层叠陶瓷电子元件的介电陶瓷层的构成; 是通过煅烧其中钙钛矿结构中的c轴/ a轴比在约1.003至1.010的范围内并且晶格中的OH基的量为约1重量％的钛酸钡粉末而获得的。 ％ 或更少。 作为起始原料的钛酸钡粉末的最大粒径优选为0.5μm以下，平均粒径为0.1〜0.3μm左右，钛酸钡粉末的单个粒子为低结晶性部21， 结晶度部分23，低结晶度部分的直径小于粉末粒度​​的约0.65倍。 当烧结时，粉末满足作为R的（烧结后的电介质陶瓷的平均粒径）/（作为原料的钛酸钡粉末的平均粒径）为约0.90〜1.2的比例，由此 抑制可观的粮食增长。 描述了包括上述介电陶瓷的多层的叠层体的层压陶瓷电子元件及其制造方法。

    Dielectric ceramic, method for producing the same, laminated ceramic electronic element, and method for producing the same
    3.
    发明授权
    Dielectric ceramic, method for producing the same, laminated ceramic electronic element, and method for producing the same 有权
    介电陶瓷，其制造方法，层叠陶瓷电子元件及其制造方法

    公开(公告)号：US06383323B1

    公开(公告)日：2002-05-07

    申请号：US09935611

    申请日：2001-08-23

    申请人： Nobuyuki Wada ,  Takashi Hiramatsu ,  Jun Ikeda ,  Yukio Hamaji

    发明人： Nobuyuki Wada ,  Takashi Hiramatsu ,  Jun Ikeda ,  Yukio Hamaji

    IPC分类号： B32B3126

    CPC分类号： H01G4/1227 ,  C04B35/4682

    摘要： A dielectric ceramic which exhibits small variation in dielectric constant, allows use of a base metal, can be fired in a reducing atmosphere and which is suitable for constituting a dielectric ceramic layer for, e.g., a laminated ceramic capacitor is obtained by firing barium titanate powder in which the c-axis/a-axis ratio in the perovskite structure is about 1.000 or more and less than about 1.003 and the amount of OH groups in the crystal lattice is about 2.0 wt. % or less. The barium titanate powder starting material preferably has a maximum particle size of about 0.3 &mgr;m or less and an average particle size of about 0.05-0.15 &mgr;m. Each particle of the barium titanate powder preferably comprises a low-crystallinity portion and a high-crystallinity portion, the diameter of the low-crystallinity portion being about 0.5 times or more the particle size of the powder. When sintered, the powder satisfies the ratio of (average grain size of the fired dielectric ceramic)/(average particle size of barium titanate powder starting material), R, of about 0.90-1.2, to thereby suppress considerable grain growth. A laminated ceramic electronic element including a laminate of a plurality of layers of the above-mentioned dielectric ceramic, as well as a method for producing the same, is described.

    摘要翻译： 介电常数变化小的电介质陶瓷可以使用贱金属，可在还原气氛中烧成，适用于构成电介质陶瓷层，例如通过烧结钛酸钡粉末得到层压陶瓷电容器 其中钙钛矿结构中的c轴/ a轴比为约1.000以上且小于约1.003，并且晶格中的OH基的量为约2.0重量％。 ％ 或更少。 钛酸钡粉末原料优选具有约0.3μm或更小的最大粒度和约0.05-0.15μm的平均粒度。 钛酸钡粉末的每个颗粒优选包含低结晶度部分和高结晶度部分，低结晶度部分的直径为粉末粒径的约0.5倍以上。 当烧结时，粉末满足（烧结的电介质陶瓷的平均粒径）/（平均粒径的钛酸钡粉末原料）的比例R为约0.90-1.2，从而抑制相当大的晶粒生长。 描述了包括上述介电陶瓷的多层的叠层体的层压陶瓷电子元件及其制造方法。

    Dielectric ceramic composition
    4.
    发明授权
    Dielectric ceramic composition 有权
    介电陶瓷组合物

    公开(公告)号：US06225250B1

    公开(公告)日：2001-05-01

    申请号：US09251663

    申请日：1999-02-17

    申请人： Nobuyuki Wada ,  Jun Ikeda ,  Takashi Hiramatsu ,  Yukio Hamaji

    发明人： Nobuyuki Wada ,  Jun Ikeda ,  Takashi Hiramatsu ,  Yukio Hamaji

    IPC分类号： C04B35468

    CPC分类号： H01G4/1227 ,  H01G4/30

    摘要： The present invention provides a dielectric ceramic composition whose electrostatic capacity has an excellently low temperature dependence; which can be fired in a reducing atmosphere; and which is advantageously used in a laminated ceramic capacitor having an internal electrode formed of a base metal such as nickel or nickel alloy. The dielectric ceramic composition is represented by the following formula: {Ba1−xCaxO}mTiO2+&agr;MgO+&bgr;MnO, wherein 0.001≦&agr;≦0.05; 0.001≦&bgr;≦0.025; 1.000

    摘要翻译： 本发明提供一种介电陶瓷组合物，其静电容量具有优异的低温依赖性; 可在还原气氛中燃烧; 并且其有利地用于具有由诸如镍或镍合金的贱金属形成的内部电极的层叠陶瓷电容器中。 介电陶瓷组合物由下式表示：其中

    Dielectric ceramic, method for producing the same, laminated ceramic electronic element, and method for producing the same
    5.
    发明授权
    Dielectric ceramic, method for producing the same, laminated ceramic electronic element, and method for producing the same 有权
    介电陶瓷，其制造方法，层叠陶瓷电子元件及其制造方法

    公开(公告)号：US06303529B1

    公开(公告)日：2001-10-16

    申请号：US09234356

    申请日：1999-01-20

    申请人： Nobuyuki Wada ,  Takashi Hiramatsu ,  Jun Ikeda ,  Yukio Hamaji

    发明人： Nobuyuki Wada ,  Takashi Hiramatsu ,  Jun Ikeda ,  Yukio Hamaji

    IPC分类号： C04B3546

    CPC分类号： H01G4/1227 ,  C04B35/4682

    摘要： A dielectric ceramic which exhibits small variation in dielectric constant, allows use of a base metal, can be fired in a reducing atmosphere and which is suitable for constituting a dielectric ceramic layer for, e.g., a laminated ceramic capacitor is obtained by firing barium titanate powder in which the c-axis/a-axis ratio in the perovskite structure is about 1.000 or more and less than about 1.003 and the amount of OH groups in the crystal lattice is about 2.0 wt. % or less. The barium titanate powder starting material preferably has a maximum particle size of about 0.3 &mgr;m or less and an average particle size of about 0.05-0.15 &mgr;m. Each particle of the barium titanate powder preferably comprises a low-crystallinity portion and a high-crystallinity portion, the diameter of the low-crystallinity portion being about 0.5 times or more the particle size of the powder. When sintered, the powder satisfies the ratio of (average grain size of the fired dielectric ceramic)/(average particle size of barium titanate powder starting material), R, of about 0.90-1.2, to thereby suppress considerable grain growth. A laminated ceramic electronic element including a laminate of a plurality of layers of the above-mentioned dielectric ceramic, as well as a method for producing the same, is described.

    摘要翻译： 介电常数变化小的电介质陶瓷可以使用贱金属，可在还原气氛中烧成，适用于构成电介质陶瓷层，例如通过烧结钛酸钡粉末得到层压陶瓷电容器 其中钙钛矿结构中的c轴/ a轴比为约1.000以上且小于约1.003，并且晶格中的OH基的量为约2.0重量％。 ％ 或更少。 钛酸钡粉末原料优选具有约0.3μm或更小的最大粒度和约0.05-0.15μm的平均粒度。 钛酸钡粉末的每个颗粒优选包含低结晶度部分和高结晶度部分，低结晶度部分的直径为粉末粒径的约0.5倍以上。 当烧结时，粉末满足（烧结的电介质陶瓷的平均粒径）/（平均粒径的钛酸钡粉末原料）的比例R为约0.90-1.2，从而抑制相当大的晶粒生长。 描述了包括上述介电陶瓷的多层的叠层体的层压陶瓷电子元件及其制造方法。

    Dielectric ceramic composition and laminated ceramic capacitor using the same
    6.
    发明授权
    Dielectric ceramic composition and laminated ceramic capacitor using the same 有权
    介电陶瓷组合物和使用其的层压陶瓷电容器

    公开(公告)号：US06243254B1

    公开(公告)日：2001-06-05

    申请号：US09369988

    申请日：1999-08-06

    申请人： Nobuyuki Wada ,  Masamitsu Shibata ,  Takashi Hiramatsu ,  Yukio Hamaji

    发明人： Nobuyuki Wada ,  Masamitsu Shibata ,  Takashi Hiramatsu ,  Yukio Hamaji

    IPC分类号： H01G406

    CPC分类号： C04B35/4684 ,  C04B35/465 ,  H01G4/1227

    摘要： Provided is a highly reliable laminated ceramic capacitor in which decrease of dielectric constant under a high electric field is small and which satisfies the B-grade and X7R grade characteristics, using Ni for the inner electrodes, wherein the dielectric material contains about 0.2 to 5.0 parts by weight of Li2O—(Si, Ti)2—MO oxides (MO is at least one of the compounds of Al2O3 and ZrO2) or SiO2—TiO2—XO oxides (XO is at least one of the compounds of BaO, CaO, SrO, MgO, ZnO and MnO) relative to 100 parts by weight of a principal component represented by (Ba1−xCaxO)mTiO2+&agr;Re2O3+&bgr;MgO+&ggr;MnO (Re2O3 represents at least one of Y2O3, Gd2O3, Tb2O3, Dy2O3, Ho2O3, Er2O3 and Yb2O3).

    摘要翻译： 提供了一种高度可靠的层叠陶瓷电容器，其中使用Ni作为内部电极，其中高电场下介电常数的降低小且满足B级和X7R等级特性，其中介电材料含有约0.2至5.0份 的Li2O-（Si，Ti）2-MO氧化物（MO是Al2O3和ZrO2的化合物中的至少一种）或SiO 2 -TiO 2 -XO氧化物（XO是BaO，CaO，SrO的化合物中的至少一种 ，MgO，ZnO和MnO）相对于100重量份由（Ba1-xCaxO）mTiO2 +αRe2O3+βMgO+γMnO表示的主成分（Re2O3表示Y2O3，Gd2O3，Tb2O3，Dy2O3，Ho2O3，Er2O3和Dy2O3中的至少一种） Yb2O3）。

    Dielectric ceramic and monolithic ceramic electronic part using the same
    7.
    发明授权
    Dielectric ceramic and monolithic ceramic electronic part using the same 失效
    介质陶瓷和单片陶瓷电子部件使用相同

    公开(公告)号：US5757610A

    公开(公告)日：1998-05-26

    申请号：US813327

    申请日：1997-03-07

    申请人： Nobuyuki Wada ,  Hidehiko Tanaka ,  Yukio Hamaji ,  Harunobu Sano

    发明人： Nobuyuki Wada ,  Hidehiko Tanaka ,  Yukio Hamaji ,  Harunobu Sano

    IPC分类号： H01G4/12 ,  H01G4/06

    CPC分类号： H01G4/12

    摘要： The present invention provides a nonreducing dielectric ceramic including a sintered compact composed of a plurality of particles expressed by a maximum diameter of about 0.5 .mu.m and an average diameter of about 0.1 to 0.3 .mu.m, each of the plurality of particles having a uniform composition and a uniform crystal system, and individual particles having the same composition and crystal system. A compact monolithic electronic part with high-reliability can be realized by using such ceramic.

    摘要翻译： 本发明提供一种非还原电介质陶瓷，其包括由最多直径约0.5μm表示的多个颗粒构成的烧结体，平均直径约为0.1至0.3μm，所述多个颗粒中的每一个具有均匀的组成 和均匀的晶体系统，以及具有相同组成和晶体体系的单个颗粒。 可以通过使用这种陶瓷来实现具有高可靠性的紧凑型单片电子部件。

    Monolithic ceramic electronic component
    8.
    发明授权
    Monolithic ceramic electronic component 有权
    单片陶瓷电子元件

    公开(公告)号：US06295196B1

    公开(公告)日：2001-09-25

    申请号：US09611101

    申请日：2000-07-06

    申请人： Yukio Hamaji ,  Nobuyuki Wada ,  Tsuyoshi Yamana ,  Takanori Nakamura

    发明人： Yukio Hamaji ,  Nobuyuki Wada ,  Tsuyoshi Yamana ,  Takanori Nakamura

    IPC分类号： H01G406

    CPC分类号： H01G4/0085 ,  H01G4/1227 ,  H01G4/30

    摘要： A monolithic ceramic electronic component includes a laminate including a plurality of ceramic layers obtained by sintering a ceramic raw material powder, and a plurality of internal electrodes located between the ceramic layers and obtained by sintering a metallic powder. The ceramic layers have a thickness of about 3 &mgr;m or less and are composed of ceramic grains having an average particle diameter of more than about 0.5 &mgr;m, the particle diameter of the ceramic grains in the thickness direction of the ceramic layers is smaller than the thickness of the ceramic layers, and the internal electrodes have a thickness of about 0.2 to 0.7 &mgr;m. Preferably, the monolithic ceramic electronic component further includes an external electrode formed on each of the opposing ends of the laminate, the ceramic layers are composed of a ceramic dielectric material, and each of the plurality of internal electrodes is formed with an edge being exposed to either one of the opposing ends of the laminate so as to be electrically connected to either one of the external electrodes to form a monolithic ceramic capacitor.

    摘要翻译： 单片陶瓷电子部件包括通过烧结陶瓷原料粉末而获得的多个陶瓷层和位于陶瓷层之间并通过烧结金属粉末获得的多个内部电极的层叠体。 陶瓷层的厚度为3μm以下，由平均粒径大于0.5μm的陶瓷颗粒构成，陶瓷层的厚度方向的陶瓷粒子的粒径小于陶瓷层的厚度 的陶瓷层，内部电极的厚度为0.2〜0.7μm左右。 优选地，所述整体式陶瓷电子部件还包括形成在所述层叠体的各相对端的外部电极，所述陶瓷层由陶瓷电介质材料构成，所述多个内部电极中的每一个形成有暴露于 层压体的相对端中的任一个，以便电连接到任一个外部电极以形成单片陶瓷电容器。