公开(公告)号：US20210098183A1

公开(公告)日：2021-04-01

申请号：US17031734

申请日：2020-09-24

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kenichi ARAKI ,  Keiichi ISHIDA

IPC: H01F27/28 ,  H01F27/255 ,  H01F27/29 ,  H01F27/32 ,  H01F41/12 ,  H01F41/02 ,  H01F41/063

Abstract: A coil component is capable of suppressing occurrence of peeling at an interface between a coil conductor and resin in a magnetic portion due to heating during mounting. The coil component includes an element body that includes a coil conductor formed by winding a conductive wire coated with an insulating film, and a magnetic portion that contains metal magnetic particles and resin, and external electrodes that are electrically connected to exposed surfaces of extended portions of the coil conductor exposed on a surface of the element body, and are arranged on the surface of the element body. The metal magnetic particles are arranged in recesses formed in a surface of the conductive wire in the extended portions of the coil conductor.

公开(公告)号：US20230317343A1

公开(公告)日：2023-10-05

申请号：US18189667

申请日：2023-03-24

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Keiichi ISHIDA

IPC: H01F27/02 ,  H01F27/255 ,  H01F1/20 ,  H01F41/12 ,  H01F27/32 ,  H01F27/29 ,  H01F1/34

CPC classification number: H01F27/022 ,  H01F27/255 ,  H01F1/20 ,  H01F41/12 ,  H01F27/32 ,  H01F27/292 ,  H01F1/342

Abstract: A coil component includes an element assembly including a coil conductor formed by winding a conductor coated with an electrically insulating film and a magnetic portion containing metal magnetic particles and resin, and an outer electrode electrically connected to an exposed surface, exposed on a surface of the element assembly, of an extended part of the coil conductor and disposed on a surface of the element assembly. The metal magnetic particles include first and second metal magnetic particles. A particle size distribution of the magnetic particles, calculated in accordance with a circle equivalent diameter obtained from a cross-sectional image in a cross section of the magnetic portion, has at least two peaks and at least one bottom. The first magnetic particles are larger than or equal to the bottom having a minimum frequency, and the second metal magnetic particles are smaller than the bottom having the minimum frequency.

公开(公告)号：US20220102036A1

公开(公告)日：2022-03-31

申请号：US17486789

申请日：2021-09-27

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Keiichi ISHIDA ,  Keita MUNEUCHI ,  Nobuyuki FUJISAWA ,  Yoshinobu KIMURA ,  Yoshihiko HATTORI

IPC: H01F1/147 ,  H01F27/28 ,  H01F27/255 ,  H01F41/02

Abstract: A magnetic compact includes first magnetic particles, second magnetic particles with larger particle sizes than the first magnetic particles, and a resin. The area ratios calculated for multiple regions of the magnetic compact have a standard deviation of 0.40 or less, where area ratio=(total area of first magnetic particles)/(total area of second magnetic particles).

公开(公告)号：US20220102052A1

公开(公告)日：2022-03-31

申请号：US17486850

申请日：2021-09-27

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Keiichi ISHIDA ,  Yoshinobu KIMURA ,  Yoshihiko HATTORI ,  Keita MUNEUCHI ,  Nobuyuki FUJISAWA

IPC: H01F27/255 ,  H01F3/08 ,  H01F1/20

Abstract: A magnetic powder contains first magnetic particles, second magnetic particles having a particle size larger than a particle size of the first magnetic particles, and resin. At least one portion of each of the second magnetic particles is covered by the resin and the first magnetic particles. Coverage (L1/L2)≥0.42 holds, where L1 is a sum of particle sizes of the first magnetic particles covering the second magnetic particle and L2 is a perimeter of the second magnetic particle.

公开(公告)号：US20210304955A1

公开(公告)日：2021-09-30

申请号：US17199922

申请日：2021-03-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Keiichi ISHIDA

IPC: H01F27/32 ,  H01F41/12 ,  H01F27/28 ,  H01F41/02 ,  H01F17/02

Abstract: A coil component includes a body and an external electrode. The body includes a coil conductor formed by winding a substantially rectangular wire covered with an insulating film, and a magnetic-body section containing a magnetic-body particle and a resin. The external electrode is electrically connected to an exposed surface of an extended portion of the coil conductor and is disposed at a surface of the body, the exposed surface being exposed at the surface of the body. The body includes first and second principal surfaces that face each other. At the wire, an average thickness of a portion of the insulating film that covers a first surface facing the first principal surface and extending in a direction orthogonal to a winding axis of the coil conductor is larger than average thicknesses of portions of the insulating film that cover other surfaces, orthogonal to the first surface, of the wire.

公开(公告)号：US20210098181A1

公开(公告)日：2021-04-01

申请号：US16935133

申请日：2020-07-21

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kenichi ARAKI ,  Keiichi ISHIDA ,  Yutaka NOGUCHI

IPC: H01F27/28 ,  H01F27/255 ,  H01F27/29 ,  H01F41/04 ,  H01F41/02

Abstract: A coil component including a substantially rectangular parallelepiped first magnetic portion that includes a coil conductor and a second magnetic portion disposed on at least the upper surface of the first magnetic portion. The first magnetic portion contains first magnetic particles including a metal magnetic material, the second magnetic portion contains second magnetic particles and a resin, and the resin content in the second magnetic portion is higher than the resin content in the first magnetic portion.

公开(公告)号：US20230326650A1

公开(公告)日：2023-10-12

申请号：US18189725

申请日：2023-03-24

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Keiichi ISHIDA

IPC: H01F27/29 ,  H01F27/02 ,  H01F27/32 ,  H01F1/20 ,  H01F1/34

CPC classification number: H01F27/022 ,  H01F1/20 ,  H01F1/342 ,  H01F27/292 ,  H01F27/32 ,  H01F41/12

Abstract: A coil component includes an element assembly including a coil conductor formed by winding a conductor coated with an electrically insulating film and a magnetic portion containing metal magnetic particles and resin, and an outer electrode electrically connected to an exposed surface of an extended part of the coil conductor, exposed on a surface of the element assembly and disposed on the surface of the element assembly. The metal magnetic particles include first and second metal magnetic particles. A particle size distribution of the metal magnetic particles, calculated in accordance with a circle equivalent diameter obtained from a cross-sectional image in a cross section of the magnetic portion, has at least two peaks and at least one bottom. The large magnetic particles are larger than or equal to the bottom having a minimum frequency.

公开(公告)号：US20230245815A1

公开(公告)日：2023-08-03

申请号：US18299568

申请日：2023-04-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kenichi ARAKI ,  Keiichi ISHIDA

IPC: H01F27/28 ,  H01F41/02 ,  H01F27/32 ,  H01F41/12 ,  H01F27/255 ,  H01F41/063 ,  H01F27/29

CPC classification number: H01F27/2823 ,  H01F41/0246 ,  H01F27/327 ,  H01F41/127 ,  H01F27/255 ,  H01F41/063 ,  H01F27/29

Abstract: A coil component is capable of suppressing occurrence of peeling at an interface between a coil conductor and resin in a magnetic portion due to heating during mounting. The coil component includes an element body that includes a coil conductor formed by winding a conductive wire coated with an insulating film, and a magnetic portion that contains metal magnetic particles and resin, and external electrodes that are electrically connected to exposed surfaces of extended portions of the coil conductor exposed on a surface of the element body, and are arranged on the surface of the element body. The metal magnetic particles are arranged in recesses formed in a surface of the conductive wire in the extended portions of the coil conductor.

公开(公告)号：US20210098163A1

公开(公告)日：2021-04-01

申请号：US17036776

申请日：2020-09-29

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Keiichi ISHIDA ,  Koichi IDA ,  Hideaki OOI

IPC: H01F1/24 ,  H01F27/28 ,  H01F27/29 ,  H01F27/255 ,  H01F41/02

Abstract: A coil component that can maintain a high magnetic permeability and improve a DC superposition characteristic, and a method for producing a magnetic powder-containing resin material used to provide such a coil component. A coil component according includes an element body including a coil conductor and a magnetic portion. The coil conductor is formed of a wound conductor wire. The magnetic portion containing metal magnetic material grains covered with an insulating coating, a resin, and insulator grains. The coil component further includes an external electrode electrically connected to an extended portion of the coil conductor and disposed on a surface of the element body. The insulator grains have a relative permeability lower than a relative permeability of the metal magnetic material grains, and the insulator grains and the insulating coating are a compound whose main component is the same.

公开(公告)号：US20190180909A1

公开(公告)日：2019-06-13

申请号：US16180943

申请日：2018-11-05

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Gota SHINOHARA ,  Noriko SHIMIZU ,  Keiichi ISHIDA ,  Hironobu KUBOTA ,  Mari YONEMURA ,  Takao KAWACHI

IPC: H01F27/22 ,  H01F27/28 ,  H01F27/29 ,  H01F27/32

Abstract: A coil component including an element assembly and a coil conductor embedded in the element assembly. The element assembly includes a first magnetic layer and a second magnetic layer that constitute a first principal surface and a second principal surface, respectively, where the first principal surface and the second principal surface are opposite to each other in the element assembly. The first magnetic layer has a higher relative magnetic permeability than the second magnetic layer. At least part of a winding portion of the coil conductor is located in the first magnetic layer. The first magnetic layer contains metal magnetic particles and a resin, and the second magnetic layer contains metal magnetic particles, a resin, and zinc oxide particles. The metal magnetic particles and the zinc oxide particles are dispersed in the resin.