公开(公告)号：US10147540B2

公开(公告)日：2018-12-04

申请号：US13848441

申请日：2013-03-21

Applicant: TDK CORPORATION

Inventor： Kyohei Tonoyama ,  Makoto Morita ,  Tomokazu Ito ,  Hitoshi Ohkubo ,  Manabu Ohta ,  Yoshihiro Maeda ,  Yuuya Kaname ,  Hideharu Moro

IPC: H01F27/255 ,  H01F17/00 ,  H01F27/28 ,  H01F41/04 ,  H01F27/29 ,  H01F17/04

Abstract: In a planar coil element and a method for producing the same, a metal magnetic powder-containing resin containing an oblate or needle-like first metal magnetic powder contains a second metal magnetic powder having an average particle size (1 μm) smaller than that (32 μm) of the first metal magnetic powder, which significantly reduces the viscosity of the metal magnetic powder-containing resin. Therefore, the metal magnetic powder-containing resin is easy to handle when applied to enclose a coil unit, which makes it easy to produce the planar coil element.

公开(公告)号：US11869686B2

公开(公告)日：2024-01-09

申请号：US17211304

申请日：2021-03-24

Applicant: TDK CORPORATION

Inventor： Kyotaro Abe ,  Hideharu Moro ,  Toshiaki Kikuchi

IPC: B22F1/054 ,  B22F1/16 ,  H01F1/147 ,  H01F1/33 ,  B82Y40/00 ,  B82Y25/00

CPC classification number: H01F1/33 ,  B22F1/054 ,  B22F1/16 ,  H01F1/147 ,  B22F2301/05 ,  B22F2301/35 ,  B82Y25/00 ,  B82Y40/00

Abstract: The object of the present invention is to provide a fluidizing particle capable of improving a fluidity of a magnetic particle for a magnetic core and capable of improving a permeability of the magnetic core. The fluidizing particle includes a particle body having a magnetic property and a coating layer including a silicon compound covering the particle body, wherein a particle size of the fluidizing particle is 10 to 40 nm, and a circularity of the fluidizing particle is 0.55 or more.

公开(公告)号：US11516951B2

公开(公告)日：2022-11-29

申请号：US16876583

申请日：2020-05-18

Applicant: TDK CORPORATION

Inventor： Takashi Yamada ,  Atsushi Sato ,  Makoto Orikasa ,  Hideharu Moro

IPC: H01L23/552 ,  H05K9/00

Abstract: A noise suppression sheet comprises at least one composite layer, the composite layer including: an insulating resin layer; a non-magnetic metal layer formed on the insulating resin layer; and a metal magnetic layer formed on the non-magnetic metal layer, and the composite layer has a through hole. When the noise suppression sheet comprises a plurality of composite layers, the through holes are misaligned in adjacent composite layers in the laminating direction.

公开(公告)号：US10923258B2

公开(公告)日：2021-02-16

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 ,  H01F3/08 ,  C22C33/02

Abstract: 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 and small particles of insulated soft magnetic material powder, wherein the large and 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 large particles to an area occupied by small particles in the cross section is 9:1 to 5:5, when a group of particles having particle size of 3 μm or more and 15 μm or less is defined as the large particles, and 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：US08975997B2

公开(公告)日：2015-03-10

申请号：US13847079

申请日：2013-03-19

Applicant: TDK Corporation

Inventor： Kyohei Tonoyama ,  Makoto Morita ,  Tomokazu Ito ,  Hitoshi Ohkubo ,  Manabu Ohta ,  Yoshihiro Maeda ,  Yuuya Kaname ,  Hideharu Moro

IPC: H01F5/00 ,  H01F27/24 ,  H01F27/28 ,  H01F27/255 ,  H01F17/00 ,  H01F27/29 ,  H01F17/04

CPC classification number: H01F27/255 ,  H01F17/0013 ,  H01F27/292 ,  H01F2017/048

Abstract: In a planar coil element, the quantitative ratio of inclined particles to total particles of a first metal magnetic powder contained in a metal magnetic powder-containing resin provided in a through hole of a coil unit is higher than the quantitative ratio of inclined particles to total particles of the first metal magnetic powder contained in the metal magnetic powder-containing resin provided in other than the through hole, and many of particles of the first metal magnetic powder in the magnetic core are inclined particles whose major axes are inclined with respect to the thickness direction and the planar direction of a substrate. Therefore, the planar coil element has improved strength as compared to a planar coil element shown in FIG. 9A and has improved magnetic permeability as compared to a planar coil element shown in FIG. 9B.

Abstract translation: 在平面线圈元件中，设置在线圈单元的通孔中的含金属磁性粉末的树脂中包含的第一金属磁粉的倾斜粒子与总粒子的定量比高于倾斜粒子与总体的定量比 除了通孔以外的金属磁性粉末的树脂中含有的第一金属磁性粉末的颗粒，磁芯中的第一金属磁性粉末的许多颗粒是倾斜的，其长轴相对于 厚度方向和基板的平面方向。 因此，与图1所示的平面线圈元件相比，平面线圈元件具有改善的强度。 与图9A所示的平面线圈元件相比，磁导率提高。 9B。

公开(公告)号：US11569014B2

公开(公告)日：2023-01-31

申请号：US16415722

申请日：2019-05-17

Applicant: TDK CORPORATION

Inventor： Hideharu Moro ,  Akihiro Harada ,  Masahito Koeda

IPC: H01F1/24 ,  H01F27/255 ,  H01F3/08 ,  B22F1/052

Abstract: A dust core includes large particles having an average particle size of 8-15 μm, medium particles having an average particle size of 1-5 μm, and small particles having an average particle size of 300-900 nm when a cross section thereof is observed. An area ratio occupied by the large particles is 50% to 90%, an area ratio occupied by the medium particles is 0% to 30%, and an area ratio occupied by the small particles is 5% to 30%, when a total area ratio occupied by the large particles, the medium particles and the small particles is 100% in the cross section. Vickers hardness (Hv) of the large particles, the medium particles and the small particles is 150-600 respectively. The small particles are alloy powder containing Fe and at least Si or N. The dust core may be included in an inductor element.

公开(公告)号：US11419250B2

公开(公告)日：2022-08-16

申请号：US16876882

申请日：2020-05-18

Applicant: TDK CORPORATION

Inventor： Takashi Yamada ,  Atsushi Sato ,  Makoto Orikasa ,  Hideharu Moro

IPC: H05K9/00

Abstract: A noise suppression sheet comprises a non-magnetic metal layer, a plurality of metal magnetic layers, and a plurality of insulating layers, and the metal magnetic layer and the insulating layer are alternately laminated on the non-magnetic metal layer. The noise suppression sheet can absorb and suppress noise generated from a circuit or the like in an electronic component by being mounted on the electronic component or the like. In the noise suppression sheet, noise is absorbed by each of the metal magnetic layers. Noise that is transmitted without being absorbed by the metal magnetic layer can be reflected by the non-magnetic metal layer and can be absorbed again by the metal magnetic layer, and hence the noise suppression sheet can suppress noise effectively.