公开(公告)号：US20230386748A1

公开(公告)日：2023-11-30

申请号：US18324344

申请日：2023-05-26

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Shinya SAITO ,  Ayako SATO ,  Yasuo WATANABE ,  Takehisa TAMURA ,  Kenya TAMAKI

IPC: H01G4/232 ,  H01G4/30

CPC classification number: H01G4/2325 ,  H01G4/30

Abstract: A multilayer ceramic electronic device includes an element body including a ceramic layer and an internal electrode layer, and an external electrode formed on an outer surface of the element body and electrically connected to part of the internal electrode layer. The external electrode includes a first layer in direct contact with the element body and containing a first insulator phase and first metal phases, and a second layer in contact with an outer surface of the first layer and containing a second insulator phase and second metal phases. An area ratio of the first metal phases in the first layer is more than 8% and 30% or less. An area ratio of the second metal phases in the second layer is larger than the area ratio of the first metal phases in the first layer. The first metal phases have an average aspect ratio of 3.5 or more.

公开(公告)号：US20230303451A1

公开(公告)日：2023-09-28

申请号：US18070860

申请日：2022-11-29

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Takeshi SHOUJI ,  Kenichiro MASUDA

IPC: C04B35/49 ,  H01G4/12

CPC classification number: C04B35/49 ,  H01G4/1209 ,  H01G4/30

Abstract: A dielectric composition includes dielectric particles and segregation phases. The dielectric particles each include Ca and/or Sr. The segregation phases each include Mn, Si, O, and at least one selected from Ca and Sr.

公开(公告)号：US20230302583A1

公开(公告)日：2023-09-28

申请号：US18162835

申请日：2023-02-01

Applicant: TDK Corporation

Inventor： Toshihiro IGUCHI ,  Norihisa ANDO

IPC: B23K35/26 ,  B23K35/02 ,  B23K35/36

CPC classification number: B23K35/262 ,  B23K35/0244 ,  B23K35/3608 ,  B23K35/361 ,  B23K35/3601 ,  B23K2101/36

Abstract: A solder includes a Sn alloy phase and a particle. The particle has a higher Young's modulus than the Sn alloy phase. The particle has a lower linear expansion coefficient than the Sn alloy phase. An electronic component includes a metal terminal joined thereto with the solder.

公开(公告)号：US20230085744A1

公开(公告)日：2023-03-23

申请号：US17945593

申请日：2022-09-15

Applicant: TDK CORPORATION

Inventor： Tetsuhiro TAKAHASHI ,  Toshihiro IGUCHI ,  Hiroki AKIBA ,  Ryota NOMURA

IPC: C04B35/495 ,  C04B35/626 ,  C04B35/64 ,  C04B35/634 ,  C04B35/638 ,  H01G4/12

Abstract: Provided is a dielectric composition containing: a main component expressed by {BaxSr(1-x)}mTa4O12; and a first subcomponent, m satisfying a relationship of 1.95≤m≤2.40. The first subcomponent includes silicon and manganese. When the amount of the main component contained in the dielectric composition is set to 100 parts by mole, the amount of silicon contained in the dielectric composition is 5.0 to 20.0 parts by mole in terms of SiO2, and the amount of manganese contained in the dielectric composition is 1.0 to 4.5 parts by mole in terms of MnO.

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.

公开(公告)号：US20220285097A1

公开(公告)日：2022-09-08

申请号：US17683645

申请日：2022-03-01

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI

IPC: H01G4/232 ,  H01G4/248 ,  H01G4/12 ,  H01G4/30

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, Zn, and Si. The second region includes an oxide having a higher melting point than Cu.

公开(公告)号：US20220285095A1

公开(公告)日：2022-09-08

申请号：US17684944

申请日：2022-03-02

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Yuichiro SUEDA ,  Ryota NAMIKI ,  Yasuhiro OKUI ,  Atsushi WATANABE

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 external electrode includes a baked electrode layer. The baked electrode layer includes a first region and a second region. The first region is contacted with an 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 constituting an outer surface of the baked electrode layer. The first region includes a first glass having a predetermined composition. The second region includes a second glass having a predetermined composition.

公开(公告)号：US20220227673A1

公开(公告)日：2022-07-21

申请号：US17558077

申请日：2021-12-21

Applicant: TDK CORPORATION

Inventor： Toshihiro IGUCHI ,  Tetsuhiro TAKAHASHI ,  Hiroki AKIBA ,  Ryota NOMURA

IPC: C04B35/495 ,  H01G4/12

Abstract: In order to provide a dielectric composition having high density even when fired at a relatively low temperature, the main component of a dielectric composition includes tantalum and at least one of barium or strontium, and the subcomponent of the dielectric composition includes at least one element selected from the group consisting of vanadium, titanium, and aluminum.