公开(公告)号：US20200039887A1

公开(公告)日：2020-02-06

申请号：US16511286

申请日：2019-07-15

Applicant: TDK CORPORATION

Inventor： Takuma ARIIZUMI ,  Toshihiko KANEKO ,  Nobuto MORIGASAKI ,  Yasuhiro ITO

IPC: C04B35/47 ,  C04B35/468 ,  C04B35/49 ,  H01G4/12 ,  H01G4/30 ,  H01G4/005 ,  C04B35/628

Abstract: The object of the present invention is to provide a dielectric ceramic composition having even improved insulation specific resistance and highly accelerated lifetime. A dielectric ceramic composition comprising a dielectric particle having a core-shell structure including a main component expressed by a general formula ABO3 (A is Ba and the like; and B is Ti and the like) and a rare earth element component R, in which a shell part of the core-shell structure has an average rare earth element concentration C of 0.3 atom % or more, and a rare earth element concentration gradient S is −0.010 atom %/nm≤S≤0.009 atom %/nm or a rare earth element concentration variation satisfies σ/C≤0.15 (a is a standard deviation of a rare earth element concentration and C is an average rare earth element concentration).

公开(公告)号：US20190259536A1

公开(公告)日：2019-08-22

申请号：US16397928

申请日：2019-04-29

Applicant: TDK Corporation

Inventor： Shogo MUROSAWA ,  Toshihiko KANEKO

IPC: H01G4/012 ,  H01G4/12 ,  H01G4/30 ,  H01G4/232

Abstract: A multilayer ceramic electronic device comprising: a ceramic element body, in which it plurality of dielectric layers and a plurality of internal electrode layers are alternately stacked, and at least a pair of external electrodes which are connected to the internal electrode layers on surfaces of the ceramic element body: a thickness of the dielectric layers is 0.4 μm or less, a width (W0) of the ceramic element body along a width-direction is 0.59 mm or less, a gap (Wgap) between an outer face of the ceramic element body and an end of the internal electrode layers along width-direction of the ceramic element body is 0.010 to 0.025 mm, and a ratio (Wgap/W0) of the gap with respect to the width is 0.025 or more.

公开(公告)号：US20190237254A1

公开(公告)日：2019-08-01

申请号：US16230154

申请日：2018-12-21

Applicant: TDK CORPORATION

Inventor： Dan SAKURAI ,  Toshihiko KANEKO ,  Nobuto MORIGASAKI ,  Toshinari TAKAHASHI ,  Yasuhiro ITO

IPC: H01G4/12 ,  H01G4/30 ,  C04B35/468

Abstract: The object of the present invention is to provide a dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime.The dielectric ceramic composition of the present invention has a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9≤m≤1.1, 0≤x≤0.5, 0≤y≤0.3, 0≤(x+y)≤0.6, and 0.03≤z≤0.3), anda first sub component made of an oxide of a rare earth element R (note that, R is at least one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), whereinthe dielectric ceramic composition includes a dielectric particle and a particle boundary, and the dielectric particle include a complete solid solution particle in which Zr is solid dissolved to the entire dielectric particle,when Za represents a concentration of Zr in the dielectric ceramic composition in case a concentration of Ti atom in the dielectric ceramic composition is deemed to be 100 atom % and when Zb represents an average concentration of Zr in the complete solid solution particle in case a concentration of Ti atom in the complete solid solution particle is deemed to be 100 atom %,0.7

公开(公告)号：US20180182549A1

公开(公告)日：2018-06-28

申请号：US15854321

申请日：2017-12-26

Applicant: TDK CORPORATION

Inventor： Nobuyuki KOIDE ,  Toshihiko KANEKO ,  Yasushi TANAKA

IPC: H01G4/12 ,  B32B18/00 ,  C04B35/468 ,  C04B35/626 ,  C04B35/64 ,  H01G4/30

Abstract: A multilayer ceramic electronic device includes a laminated body having alternately laminated internal electrode layers and dielectric layers. The dielectric layer has a thickness of 0.5 μm or less. The internal electrode layers contain ceramic particles. A content ratio of the ceramic particles contained in the internal electrode layer is 2 to 15% by representation of cross sectional area.

公开(公告)号：US20160284473A1

公开(公告)日：2016-09-29

申请号：US15082814

申请日：2016-03-28

Applicant: TDK Corporation

Inventor： Shogo MUROSAWA ,  Toshihiko KANEKO

IPC: H01G4/12 ,  H01G4/012 ,  H01G4/248 ,  H01G4/30

CPC classification number: H01G4/012 ,  H01G4/1209 ,  H01G4/1227 ,  H01G4/232 ,  H01G4/30

Abstract: A multilayer ceramic electronic device comprising: a ceramic element body, in which a plurality of dielectric layers and a plurality of internal electrode layers are alternately stacked, and at least a pair of external electrodes which are connected to the internal electrode layers on surfaces of the ceramic element body; a thickness of the dielectric layers is 0.4 μm or less, a width (W0) of the ceramic element body along a width-direction is 0.59 mm or less, a gap (Wgap) between an outer face of the ceramic element body and an end of the internal electrode layers along width-direction of the ceramic element body is 0.010 to 0.025 mm, and a ratio (Wgap/W0) of the gap with respect to the width is 0.025 or more.

Abstract translation: 一种多层陶瓷电子器件，包括：陶瓷元件体，其中多个电介质层和多个内部电极层交替堆叠;以及至少一对外部电极，其连接到所述内部电极层的表面上 陶瓷元件体; 电介质层的厚度为0.4μm以下，陶瓷元件主体沿宽度方向的宽度（W0）为0.59mm以下，陶瓷元件主体的外表面与端部的间隙（Wgap） 的内部电极层的宽度方向为0.010〜0.025mm，间隙相对于宽度的比（Wgap / W0）为0.025以上。