公开(公告)号：US20210027945A1

公开(公告)日：2021-01-28

申请号：US16932298

申请日：2020-07-17

Applicant: TDK CORPORATION

Inventor： Tetsuhiro TAKAHASHI ,  Tomohisa FUKUOKA

IPC: H01G4/232

Abstract: The present invention relates to a ceramic electronic device including a ceramic body having ceramic layers and internal electrode layers stacked in alternating manner and a terminal electrode formed at an end face of the ceramic body. The terminal electrode includes a base electrode including a metal component and a glass component, an intermediate electrode layer including Ni and formed at an outer face of the base electrode layer, and an upper electrode layer including Pd or Au and formed at an outer face of the intermediate electrode layer. Also, a surface roughness Ra1 of the base electrode layer in the terminal electrode is 5.0 μm or less; or the surface roughness Ra1 of the base electrode layer, a surface roughness Ra2 of the intermediate electrode layer, and a surface roughness Ra3 of the upper electrode layer satisfy a relationship of Ra1>Ra3≥Ra2.

公开(公告)号：US20240321520A1

公开(公告)日：2024-09-26

申请号：US18603515

申请日：2024-03-13

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Tomohisa FUKUOKA

IPC: H01G4/232 ,  H01G4/30

CPC classification number: H01G4/2325 ,  H01G4/30

Abstract: An electronic component structure includes: a first electronic component; a second electronic component; a low melting point layer located between the first electronic component and the second electronic component and containing a first metal material having a melting point of 300° C. or lower; and a high melting point layer located between the first electronic component and the second electronic component and containing a second metal material having a melting point of 400° C. or higher. In the electronic component structure, the first electronic component and the second electronic component are connected to each other by a multilayer connection portion formed by overlapping the low melting point layer and the high melting point layer.

公开(公告)号：US20140240896A1

公开(公告)日：2014-08-28

申请号：US14188478

申请日：2014-02-24

Applicant: TDK Corporation

Inventor： Nobuto MORIGASAKI ,  Takashi SASAKI ,  Tomohisa FUKUOKA ,  Yuhta MATSUNAGA ,  Kazuhiro KOMATSU

IPC: H01G4/12 ,  C04B35/468

CPC classification number: C04B35/4682 ,  C04B2235/3206 ,  C04B2235/3224 ,  C04B2235/3236 ,  C04B2235/3239 ,  C04B2235/3241 ,  C04B2235/3256 ,  C04B2235/3258 ,  C04B2235/3262 ,  C04B2235/3418 ,  C04B2235/5445 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6584 ,  C04B2235/664 ,  C04B2235/785 ,  C04B2235/79 ,  H01G4/1227 ,  H01G4/1236 ,  H01G4/30 ,  Y10T428/2982

Abstract: A multilayer ceramic composition showing good characteristics, even when electric intensity on dielectric layers is high and a stacked number of a multilayer ceramic capacitor is increased, and an electronic device thereof. Said composition comprises: a perovskite compound ABO3, and with respect to 100 moles of said compound, 0.6 or more to 1.4 or less moles of Ra2O3 in which Ra is at least one of Dy, Gd and Tb, 0.2 or more to 0.7 or less moles of Rb2O3 in which Rb is at least one of Ho and Y, and 0.2 or more to 0.7 or less moles of Rc2O3 in which Rc is at least one of Yb and Lu, in terms of each oxide, 0.6 or more to 1.6 or less moles of Mg oxide in terms of Mg, and 0.6 or more to less than 1.2 moles of Si included compound in terms of Si.

Abstract translation: 即使电介质层上的电强度高，叠层数多的多层陶瓷电容器也具有良好的特性的多层陶瓷组合物及其电子器件。 所述组合物包括：钙钛矿化合物ABO 3，相对于100摩尔所述化合物，其中Ra为Dy，Gd和Tb中至少一种为0.2以上至0.7以下的Ra 2 O 3为0.6以上且1.4摩尔以下 其中R b为至少一种Ho和Y的摩尔数，以及其中Rc为Yb和Lu中的至少一种的Rc2O3的0.2或更多至0.7或更小的摩尔数，就每种氧化物而言为0.6或更多至1.6或 以Mg换算的氧化镁摩尔数少，Si含量为0.6以上且小于1.2摩尔Si的化合物。

公开(公告)号：US20240321518A1

公开(公告)日：2024-09-26

申请号：US18609537

申请日：2024-03-19

Applicant: TDK Corporation

Inventor： Tomohisa FUKUOKA ,  Toshihiro Iguchi

IPC: H01G4/232 ,  H01G2/06 ,  H01G4/008 ,  H01G4/012 ,  H01G4/30

CPC classification number: H01G4/232 ,  H01G2/065 ,  H01G4/008 ,  H01G4/012 ,  H01G4/30

Abstract: An electronic component includes an element body portion and a terminal electrode portion formed. The terminal electrode portion includes a base electrode layer that is in direct contact with the end surface and a surface electrode layer that covers the base electrode layer and constitutes an outermost surface of the terminal electrode portion. A relation between a thickness T2 of the surface electrode layer and a thickness T4 of the surface electrode layer satisfies 1.3≤T4/T2≤15.0, while the T2 is along a second reference line parallel to the lower surface and passes through a height of three quarters of the entire element body portion from the lower surface, and the T4 is along a fourth reference line parallel to the lower surface and passes through a height of one quarter of the entire element body portion from the lower surface.

公开(公告)号：US20150274597A1

公开(公告)日：2015-10-01

申请号：US14663160

申请日：2015-03-19

Applicant: TDK CORPORATION

Inventor： Nobuto MORIGASAKI ,  Takeru YOSHIDA ,  Tomohisa FUKUOKA ,  Yuhta MATSUNAGA ,  Kazuhiro KOMATSU

IPC: C04B35/468

CPC classification number: C04B35/4682 ,  C04B35/638 ,  C04B2235/3206 ,  C04B2235/3215 ,  C04B2235/3224 ,  C04B2235/3236 ,  C04B2235/3239 ,  C04B2235/3262 ,  C04B2235/3418 ,  C04B2235/5445 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/6584 ,  C04B2235/79 ,  C04B2235/85 ,  H01G4/1227

Abstract: A dielectric ceramic composition includes at least dielectric particles having a core-shell structure and segregation particles, a concentration of a rare earth compound in the segregation particle is twice or more than an average concentration of the rare earth compound in a shell part of the dielectric particle having the core-shell structure, an area occupied by the segregation particles is 0.1 to 1.1%, when a maximum particle size of the segregation particle is defined as rbmax, a minimum particle size of the segregation particle is defined as rbmin, and an average particle size of the dielectric particle having the core-shell structure is defined as ra, a relation of rbmax/ra≦2.00 and rbmin/ra≧0.25 is satisfied, and the segregation particles substantially do not include Mg.

Abstract translation: 电介质陶瓷组合物至少包括具有核 - 壳结构和偏析粒子的电介质粒子，偏析粒子中稀土化合物的浓度是电介质的外壳部分中稀土化合物的平均浓度的两倍或更多 具有核 - 壳结构的粒子，由偏析粒子占据的面积为0.1〜1.1％，将分离粒子的最大粒径定义为rbmax时，将分离粒子的最小粒径定义为rbmin，将 具有核 - 壳结构的电介质粒子的平均粒径被定义为ra，满足rbmax / ra＆nlE; 2.00和rbmin /ra≥0.25的关系，并且偏析粒子基本上不包括Mg。