公开(公告)号：US20240312696A1

公开(公告)日：2024-09-19

申请号：US18429997

申请日：2024-02-01

Applicant: TDK Corporation

Inventor： Nobuyuki OKUZAWA ,  Yuichi TAKUBO ,  Ryuji HASHIMOTO ,  Yuta TAKAHASHI ,  Hiroki HOSAKA

IPC: H01F27/29 ,  H01F27/28

CPC classification number: H01F27/292 ,  H01F27/2804 ,  H01F2027/2809

Abstract: An electronic component includes: an element body having a main surface as a mounting surface; a coil portion having a coil pattern formed by a plurality of coil conductors in the element body; and a pair of external electrodes formed on the main surface of the element body and electrically connected to the coil portion, the external electrode includes a first electrode layer exposed from the main surface of the element body and a second electrode layer embedded in the element body, the first electrode layer includes a first region overlapping the second electrode layer and a second region not overlapping the second electrode layer when viewed from a first direction perpendicular to the main surface, the second region overlaps the coil conductor when viewed from the first direction, and the second electrode layer has an extended portion protruding from an outer edge of the first electrode layer.

公开(公告)号：US20200005973A1

公开(公告)日：2020-01-02

申请号：US16465402

申请日：2017-11-30

Applicant: TDK CORPORATION

Inventor： Takurou IWASA ,  Ryuji HASHIMOTO ,  Masashi ITO

IPC: H01F1/055 ,  H01F1/053 ,  C22C38/00 ,  C22C38/10 ,  C22C33/02

Abstract: A rare-earth sintered magnet contains main phase crystal grains having an Nd5Fe17-type crystal structure, includes R and T (where R represents one or more rare-earth elements that essentially include Sm and T represents Fe or one or more transition metal elements that essentially include Fe and Co), and wherein the compositional ratio of R is 20-40 at % and the remaining portion is substantially T; the remaining portion other than R is substantially only T or only T and C; and when the main phase crystal grains' average grain size in one cross-sectional surface of the rare-earth sintered magnet is defined as Dv, while grain size of individual main phase crystal grains is defined as Di, Dv is at least 1.0 μm, and the main phase crystal grains' area ratio that satisfy 0.7Dv≤Di≤2.0Dv is at least 80% with respect to the area of a cross-sectional surface of the rare-earth sintered magnet.

公开(公告)号：US20160086703A1

公开(公告)日：2016-03-24

申请号：US14385855

申请日：2014-02-12

Applicant: TDK CORPORATION

Inventor： Kenichi SUZUKI ,  Yuji UMEDA ,  Ryuji HASHIMOTO

IPC: H01F1/057 ,  H02K21/02

CPC classification number: H01F1/0577 ,  H02K21/02

Abstract: A R-T-B based permanent magnet which not only has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet as well as light mass but also can be suitably used as a magnet for field system of a permanent magnet synchronous rotating machine. The magnet can be obtained in a case where the composition of the compound for forming the main phase is (R1-x(Y1-zLaz)x)2T14B (R is rare earth element(s) consisting of one or more elements of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, T is one or more transition metal elements with Fe or Fe and Co as essential elements, 0.0

Abstract translation: 不仅具有与现有的Nd-Fe-B系永久磁铁等同的磁特性以及轻质量的R-T-B系永磁体，而且也可以适用于永久磁铁同步旋转机的磁场系统的磁体。 在用于形成主相的化合物的组成为（R1-x（Y1-zLaz）x）2T14B（R是由Ce的一种或多种元素组成的稀土元素）的情况下，可以获得磁体， Pr，Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er，Tm，Yb和Lu，T是一种或多种具有Fe或Fe和Co作为必需元素的过渡金属元素，0.0

公开(公告)号：US20150302959A1

公开(公告)日：2015-10-22

申请号：US14686200

申请日：2015-04-14

Applicant: TDK CORPORATION

Inventor： Ryuji HASHIMOTO ,  Yasushi ENOKIDO ,  Hironori WADA

IPC: H01F1/057 ,  C22C38/00

CPC classification number: C22C38/002 ,  B22F2998/10 ,  C22C38/005 ,  H01F1/0577 ,  B22F9/023 ,  B22F9/04 ,  B22F2009/043 ,  B22F3/02 ,  B22F3/10

Abstract: In the present invention, a permanent magnet with excellent temperature properties and magnetic properties which will not significantly deteriorate can be stably prepared, by using a raw alloy for the R-T-B based permanent magnet in which the rare earth element(s) composed of at least one selected from the group consisting of Y, La and Ce is selected as a predetermined amount of the rare earth element R in the R-T-B based permanent magnet and a proper amount of Ca is contained.

Abstract translation: 在本发明中，通过使用用于RTB型永久磁铁的原料合金，可以稳定地制备出不会显着劣化的具有优异的温度特性和磁特性的永久磁铁，其中稀土元素由至少一个 选自Y，La和Ce组中的一种，作为RTB永磁体中的稀土元素R的预定量，并且含有适量的Ca。

公开(公告)号：US20140320246A1

公开(公告)日：2014-10-30

申请号：US14262156

申请日：2014-04-25

Applicant: TDK CORPORATION

Inventor： Ryuji HASHIMOTO ,  Kenichi SUZUKI ,  Kyung-ku CHOI ,  Kenichi NISHIKAWA

IPC: H01F1/057

CPC classification number: H01F1/057 ,  H01F10/126

Abstract: The present invention provides a permanent magnet which is excellent in the temperature properties and the magnetic properties of which will not be significantly decreased, compared to the conventional R-T-B based permanent magnet. In the R-T-B based structure, a stacked structure of R1-T-B based crystal layer and Y-T-B based crystal layer can be formed by alternatively stacking R1-T-B and Y-T-B. In this way, a high magnetic anisotropy field of the R1-T-B based crystal layer can be maintained while the temperature coefficient of the Y-T-B based crystal layer can be improved.

Abstract translation: 本发明提供一种与常规的R-T-B系永磁体相比，其温度特性优异，磁特性不会显着降低的永磁体。 在基于R-T-B的结构中，可以通过交替地堆叠R1-T-B和Y-T-B来形成R1-T-B基晶体层和Y-T-B基晶体层的堆叠结构。 以这种方式，可以保持R1-T-B基晶体层的高磁各向异性场，同时可以提高Y-T-B系晶体层的温度系数。