公开(公告)号：US20180096766A1

公开(公告)日：2018-04-05

申请号：US15718757

申请日：2017-09-28

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Yu YONEZAWA ,  Syota GOTO ,  Hideaki YOKOTA ,  Akito HASEGAWA ,  Masahito KOEDA ,  Seigo TOKORO

IPC: H01F1/147 ,  C22C38/12 ,  C22C38/16 ,  C22C38/02

CPC classification number: H01F1/14766 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/15308 ,  H01F1/15333

Abstract: A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings. A virtual-line total distance per 1 μm3 of the soft magnetic alloy is 10 mm to 25 mm provided that the virtual-line total distance is a sum of virtual lines linking the maximum points adjacent each other. A virtual-line average distance that is an average distance of the virtual lines is 6 nm or more and 12 nm or less.

公开(公告)号：US20180025822A1

公开(公告)日：2018-01-25

申请号：US15656242

申请日：2017-07-21

Applicant: TDK CORPORATION

Inventor： Yu YONEZAWA ,  Tomofumi KURODA ,  Yusuke TANIGUCHI

IPC: H01F1/20 ,  B22F1/00 ,  B22F1/02

CPC classification number: H01F1/20 ,  B22F1/0014 ,  B22F1/0048 ,  B22F1/0062 ,  B22F1/02 ,  B22F3/02 ,  B22F9/04 ,  B22F2009/044 ,  C22C33/02 ,  C22C33/0292 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C2202/02 ,  H01F1/26 ,  H01F41/0246

Abstract: A soft magnetic metal dust core including a soft magnetic metal powder and a nonmagnetic material, in which when observing a field of view including “n”, a natural number of 50 or more, particles of the soft magnetic metal powder on a grinded smooth cross section of the dust core, the soft magnetic metal powder is coated by the nonmagnetic material, and a number of an opposing part P is n/2 or more, in which the opposing part P is a part where a length L is 10 μm or more, and the length L is a continuous length where a distance between particles of the soft magnetic metal powder is 400 nm or less, is provided. The soft magnetic metal dust core is superior in DC superimposing characteristic.

公开(公告)号：US20180247744A1

公开(公告)日：2018-08-30

申请号：US15904986

申请日：2018-02-26

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Kenji HORINO ,  Akito HASEGAWA ,  Yu YONEZAWA ,  Syota GOTO ,  Seigo TOKORO

IPC: H01F1/153 ,  C22C45/02

CPC classification number: H01F1/1535 ,  C22C33/003 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C45/02 ,  C22C2200/02 ,  C22C2202/02 ,  H01F1/15308 ,  H01F41/0226 ,  H01F41/0246

Abstract: Provided is a soft magnetic alloy including Fe as a main component, in which a slope of an approximate straight line, plotted between cumulative frequencies of 20 to 80% on Fe content in each grid of 80000 grids or more, each of which has 1 nm×1 nm×1 nm, is −0.1 to −0.4, provided that Fe content (atom %) of each grid is Y axis, and the cumulative frequencies (%) obtained in descending order of Fe content in each grid is X axis, and an amorphization ratio X is 85% or more.

公开(公告)号：US20200273610A1

公开(公告)日：2020-08-27

申请号：US16792956

申请日：2020-02-18

Applicant: TDK Corporation

Inventor： Isao KANADA ,  Yu YONEZAWA

IPC: H01F1/24 ,  H01F1/33

Abstract: A composite magnetic material includes a powder and a resin. The powder has a main component containing Fe or Fe and Co. An average minor axis length in primary particles of the powder is 100 nm or less. A point satisfying (X, Y)=(σ/Av (%), (Av-σ)) on an XY coordinate plane is present within a region (including a boundary) surrounded by three points α(24.5, 6.7), β(72.0, 1.2), and γ(24.5, 1.2), in which an average of aspect ratios in the primary particles of the powder is set to Av, and a standard deviation of the aspect ratios in the primary particles of the powder is set to σ.

公开(公告)号：US20180180643A1

公开(公告)日：2018-06-28

申请号：US15717488

申请日：2017-09-27

Applicant: TDK CORPORATION

Inventor： Yu YONEZAWA ,  Kazuhiro YOSHIDOME ,  Hideaki YOKOTA ,  Hiroyuki MATSUMOTO ,  Syota GOTO ,  Takehiro GOHARA

IPC: G01Q30/04

CPC classification number: G01Q30/04 ,  H01F1/15308

Abstract: An analysis method of a composition network topology structure includes obtaining a three-dimensional body for analysis capable of being used for three-dimensional measurement of a concentration distribution of a specific element contained in a sample within a predetermined measurement range. The three-dimensional body for analysis is divided into unit grids composed of a plurality of finer three-dimensional bodies. An amount of the specific element contained in each of the unit grids is obtained. Maximum-point grids respectively having a largest amount of the specific element among adjacent unit grids are obtained. The composition network topology structure of the specific element owned by the sample is quantified in relation to the maximum-point grids contained in the three-dimensional body for analysis.

公开(公告)号：US20180096765A1

公开(公告)日：2018-04-05

申请号：US15718617

申请日：2017-09-28

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Yu YONEZAWA ,  Syota GOTO ,  Hideaki YOKOTA ,  Akito HASEGAWA ,  Masahito KOEDA ,  Seigo TOKORO

IPC: H01F1/147 ,  H01F27/255 ,  C22C38/16 ,  C22C38/12 ,  C22C38/02

CPC classification number: H01F1/14766 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16 ,  H01F1/15308 ,  H01F27/255

Abstract: A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings in 400,000/μm3 or more. A ratio of Fe content maximum points whose coordination number is 1 or more and 5 or less is 80% or more and 100% or less with respect to all of the Fe content maximum points.

公开(公告)号：US20200082964A1

公开(公告)日：2020-03-12

申请号：US16494791

申请日：2018-03-30

Applicant: TDK CORPORATION

Inventor： Takeshi SAKAMOTO ,  Yoshihiro SHINKAI ,  Yu YONEZAWA ,  Hideharu MORO ,  Kensuke ARA ,  Tohru OIKAWA ,  Isao KANADA ,  Kenji HORINO ,  Kyung-Ku CHOI

IPC: H01F1/33 ,  H01F1/24 ,  H01F27/255 ,  H01F17/04 ,  H01F17/00

Abstract: A composite magnetic body with high permeability and low magnetic loss in a high-frequency region of a gigahertz band; and a high-frequency electronic component using the same, the electronic component being compact and having low-insertion loss. This composite magnetic body has a high permeability and a low magnetic loss especially in a high-frequency region of a gigahertz band, and is provided with: a plurality of magnetic nanowires 361-363 aligned so as not to cross each other; and insulators 365-367 that electrically insulate the plurality of magnetic nanowires 361-363.

公开(公告)号：US20190189319A1

公开(公告)日：2019-06-20

申请号：US16197996

申请日：2018-11-21

Applicant: TDK CORPORATION

Inventor： Hideharu MORO ,  Akihiro HARADA ,  Yu YONEZAWA

IPC: H01F1/24 ,  B22F1/00 ,  H01F27/255

CPC classification number: H01F1/24 ,  B22F1/0014 ,  B22F2301/15 ,  B22F2301/20 ,  B22F2301/35 ,  B22F2304/10 ,  H01F27/255

Abstract: To provide a dust core excellent in DC superimposition characteristics and low in eddy current loss at a high frequency band of several MHz, and an inductor element using the dust core. A dust core contains large particles and small particles of insulated soft magnetic material powder, wherein the large particles and the small particles have a saturation magnetic flux density of 1.4 T or more, and wherein in the soft magnetic material powder observed in a cross section of the dust core, a ratio of an area occupied by the large particles to an area occupied by the small particles in the cross section is 9:1 to 5:5, when a group of particles having a particle size of 3 μm or more and 15 μm or less is defined as the large particles, and a group of particles having a particle size of 300 nm or more and 900 nm or less is defined as the small particles.

公开(公告)号：US20190006070A1

公开(公告)日：2019-01-03

申请号：US16007485

申请日：2018-06-13

Applicant: TDK CORPORATION

Inventor： Yu YONEZAWA ,  Yoshihiro SHINKAI

IPC: H01F1/28 ,  H01F3/08 ,  B22F1/00 ,  C22C38/10

Abstract: A composite magnetic material includes a needle-like powder and a spherical powder. The needle-like powder includes a soft magnetic material and has an average minor-axis length of 100 nm or less and an average aspect ratio of 3.0 or more and 10.0 or less. The spherical powder includes a soft magnetic material and has an average major-axis length of 100 nm or less and an average aspect ratio of less than 3.0.

公开(公告)号：US20180247746A1

公开(公告)日：2018-08-30

申请号：US15904844

申请日：2018-02-26

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Kenji HORINO ,  Akito HASEGAWA ,  Yu YONEZAWA ,  Syota GOTO ,  Seigo TOKORO

IPC: H01F1/153 ,  C22C45/02

CPC classification number: H01F1/15308 ,  C22C45/02 ,  H01F1/15333

Abstract: Provided is a soft magnetic alloy including Fe, as a main component, and including B. Among 80000 pieces of a grid having 1 nm×1 nm×1 nm in a continuous measurement range of the soft magnetic alloy, 4000 pieces of the grid from lower Fe content shows B content variation (σB) of 2.8 or more, and an amorphization ratio X of the soft magnetic alloy of 85% or more.