公开(公告)号：US20220380257A1

公开(公告)日：2022-12-01

申请号：US17748524

申请日：2022-05-19

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI

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

Abstract: A dielectric composition includes dielectric particles, grain boundary phases, and segregations. The dielectric particles each include a perovskite compound represented by ABO3 as a main component. The grain boundary phases are located between the dielectric particles. The segregations exist in a part of the grain boundary phases and include at least Al, Si, and O. A molar ratio (Al/(Al+Si)) of an Al content to a total content of Al and Si in the segregations is 0.45 or more and 0.75 or less.

公开(公告)号：US20250037936A1

公开(公告)日：2025-01-30

申请号：US18756548

申请日：2024-06-27

Applicant: TDK CORPORATION

Inventor： Ryota NAMIKI ,  Toshihiro IGUCHI

IPC: H01G4/12 ,  H01G4/236 ,  H01G4/30

Abstract: A dielectric includes a dielectric grain, a segregate, and a pore. The segregate and the pore are in contact to form a specific combination in a section of the dielectric. A multilayer electronic device includes a dielectric including a dielectric grain, a segregate, and a pore. The segregate and the pore are in contact to form a specific combination in a section of the dielectric.

公开(公告)号：US20220384112A1

公开(公告)日：2022-12-01

申请号：US17748697

申请日：2022-05-19

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI

IPC: H01G4/12 ,  C04B35/468 ,  H01G4/30 ,  H01G4/008 ,  H01G4/012

Abstract: A dielectric composition includes dielectric particles and first segregations. The dielectric particles each include a perovskite compound represented by ABO3 as a main component. The first segregations each include at least Ba, P, and O. A molar ratio (Ba/Ti) of Ba to Ti in the first segregations is 1.20 or more.

公开(公告)号：US20220384111A1

公开(公告)日：2022-12-01

申请号：US17748482

申请日：2022-05-19

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI

IPC: H01G4/12 ,  C04B35/468 ,  H01G4/30 ,  H01G4/012 ,  H01G4/008

Abstract: A dielectric composition includes dielectric particles and first segregations. The dielectric particles each include a perovskite compound represented by ABO3 as a main component. The first segregations each include at least Ba, V, and O. A molar ratio (Ba/Ti) of Ba to Ti detected in the first segregations is 1.20 or more.

公开(公告)号：US20250096765A1

公开(公告)日：2025-03-20

申请号：US18756961

申请日：2024-06-27

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Masaki HARA ,  Ryota NAMIKI ,  Ayako SATO ,  Kenya TAMAKI

IPC: H03H7/00

Abstract: An equivalent circuit includes a first capacitor having a first capacitance, a circuit part configured to include an inductor component, a capacitor component, and a resistor connected in series with one another, the circuit part being connected in parallel with the first capacitor, and a second capacitor provided between the first capacitor and the circuit part and having a second capacitance. The first capacitance of the first capacitor changes in accordance with a voltage value of a direct current voltage applied to the first capacitor. The second capacitor has the positive second capacitance that changes in accordance with the voltage value of the direct current voltage applied to the first capacitor and that is N times (N>0) the first capacitance of the first capacitor.

公开(公告)号：US20220293343A1

公开(公告)日：2022-09-15

申请号：US17685018

申请日：2022-03-02

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI

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

Abstract: A ceramic electronic device includes an element body and an external electrode. The element body is formed by laminating a ceramic layer and an internal electrode layer. The external electrode is electrically connected to at least one end of the internal, electrode layer. The element body includes a boundary layer at an end of the ceramic layer. The ceramic layer includes a perovskite compound represented by ABO3 as a main component. The boundary layer includes Ba and Ti as a main component. The boundary layer includes 0.27-0.40 parts by mol of Ba, provided that a total of Ba and Ti included in the boundary layer is 1 part by mol.

公开(公告)号：US20220285096A1

公开(公告)日：2022-09-08

申请号：US17683518

申请日：2022-03-01

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI

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

Abstract: A ceramic electronic device includes an element body and an external electrode. The element body is formed by laminating a ceramic layer and an internal electrode layer. The external electrode is electrically connected to at least one end of the internal electrode layer. At least a part of a joint boundary between the electrode layer and the ceramic layer includes an interface protrusion on the external electrode side. The interface protrusion is made of an oxide.

公开(公告)号：US20220392704A1

公开(公告)日：2022-12-08

申请号：US17748580

申请日：2022-05-19

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Hiroaki MURAKAMI ,  Yuichiro SUEDA ,  Ryota NAMIKI

IPC: H01G4/12 ,  C04B35/468 ,  H01G4/30 ,  H01G4/008 ,  H01G4/012

Abstract: A dielectric composition includes dielectric particles and first segregations. The dielectric particles each include a perovskite compound represented by ABO3 as a main component. The first segregations each include Ba, Ti, Si, Ni, and O.

公开(公告)号：US20220293344A1

公开(公告)日：2022-09-15

申请号：US17683602

申请日：2022-03-01

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI

IPC: H01G4/12 ,  H01G4/012 ,  H01G4/30 ,  H01G4/008

Abstract: A ceramic electronic device includes an element body and an external electrode. The element body includes a ceramic layer and an internal electrode layer. The external electrode is formed on an end surface of the element body and electrically connected to a part of the internal electrode layer. The ceramic layer includes a perovskite compound represented by ABO3 as a main component. The external electrode includes a baked electrode layer having a first region and a second region. The first region is contacted with the end surface of the element body and located near a joint boundary with the element body. The second region is located outside the first region and constitutes an outer surface of the baked electrode layer. The first region includes a glass frit including at least B and Si. The second region includes an Al based oxide mainly including Al.

公开(公告)号：US20220285098A1

公开(公告)日：2022-09-08

申请号：US17683897

申请日：2022-03-01

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI

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

Abstract: A ceramic electronic device includes an element body and an external electrode. The element body includes a ceramic layer and an internal electrode layer. The external electrode is formed on an end surface of the element body and electrically connected to a part of the internal electrode layer. The ceramic layer includes a perovskite compound represented by ABO3 as a main component. The external electrode includes a conductor and a glass frit diffused in the conductor. The glass frit includes B, Si, Ba, and Zn. A boundary layer is present at an end of the ceramic layer in contact with the external electrode on the end surface of the element body and comprises an oxide including Ba, Zn, and Si.