公开(公告)号：US20230063586A1

公开(公告)日：2023-03-02

申请号：US17898767

申请日：2022-08-30

Applicant: TDK CORPORATION

Inventor： Hokuto EDA ,  Hitoshi OHKUBO ,  Masazumi ARATA ,  Masataro SAITO ,  Kohei TAKAHASHI ,  Takamasa IWASAKI

IPC: H01F1/14 ,  H01F5/04 ,  H01F5/06

Abstract: Since the magnetic sheet is adopted as the coil component, magnetic saturation is likely to occur in the magnetic sheet, and it is considered that the DC superimposition characteristic of the coil component is deteriorated. However, since the inner edge of the coil structure backs down with respect to the inner edge of the magnetic sheet so that the magnetic flux generated in the coil easily circulates, the deterioration of the DC superimposition characteristics due to the adoption of the magnetic sheet is suppressed.

公开(公告)号：US20240331904A1

公开(公告)日：2024-10-03

申请号：US18616465

申请日：2024-03-26

Applicant: TDK CORPORATION

Inventor： Hitoshi OHKUBO ,  Hokuto EDA ,  Masazumi ARATA ,  Miyuki ASAI ,  Takahiro HOSOKAWA ,  Yuji MATSUURA

IPC: H01F3/08 ,  H01F5/04

CPC classification number: H01F3/08 ,  H01F5/04

Abstract: Since each of an inner core, an outer core portion, and exterior portions in an element body is constituted by a magnetic body having the same material composition, internal stress is less likely to occur at the interface therebetween, and cracks due to internal stress are less likely to occur at the interface. Since a filling rate of a maximum magnetic particle having relatively high magnetic permeability is high in the inner core, the magnetic permeability of the inner core is significantly increased, and the coil characteristics of the coil component are improved.

公开(公告)号：US20220037068A1

公开(公告)日：2022-02-03

申请号：US17502323

申请日：2021-10-15

Applicant: TDK CORPORATION

Inventor： Kyohei TONOYAMA ,  Ken SATOH ,  Kentaro SAITO ,  Miyuki ASAI ,  Hitoshi OHKUBO

IPC: H01F1/20 ,  B22F1/00 ,  B22F1/02 ,  C22C38/16 ,  C22C38/00 ,  C22C38/12 ,  H01F1/24 ,  C22C38/08

Abstract: A magnetic core includes a metal magnetic powder, which has a large size powder, an intermediate size powder, and a small size powder. A particle size of the large size powder is 10 μm or more and 60 μm or less. A particle size of the intermediate size powder is 2.0 μm or more and less than 10 μm. A particle size of the small size powder is 0.1 μm or more and less than 2.0 μm. The large size powder, the intermediate size powder, and the small size powder have an insulation coating. When A1 represents an average insulation coating thickness of the large size powder, A2 represents an average insulation coating thickness of the intermediate size powder, A3 represents an average insulation coating thickness of the small size powder, A3 is 30 nm or more and 100 nm or less, A3/A1≥1.3, and A3/A2≥1.0.

公开(公告)号：US20200373064A1

公开(公告)日：2020-11-26

申请号：US16877772

申请日：2020-05-19

Applicant: TDK CORPORATION

Inventor： Miyuki ASAI ,  Hokuto EDA ,  Masazumi ARATA ,  Hitoshi OHKUBO

IPC: H01F27/28 ,  H01F27/255 ,  H01F27/32

Abstract: In a coil component, an uneven structure provided by an insulation layer and a resin wall contributes to extension of a contact area with respect to a magnetic body, so that an adhesive force with respect to the magnetic body is improved. In addition, the magnetic body protrudes downward toward an exposed region of the resin wall corresponding to a recessed portion in the uneven structure, a volume thereof is increased, and coil characteristics such as an inductance value are improved.

公开(公告)号：US20200373061A1

公开(公告)日：2020-11-26

申请号：US16877898

申请日：2020-05-19

Applicant: TDK CORPORATION

Inventor： Miyuki ASAI ,  Takahiro KAWAHARA ,  Masazumi ARATA ,  Hitoshi OHKUBO

IPC: H01F27/255 ,  H01F5/06

Abstract: In a coil component, a second magnetic portion disposed in the vicinity of a coil is designed to have a higher proportion of Fe than a metal magnetic powder-containing resin constituting a first magnetic portion. Therefore, a magnetic flux of the coil flows smoothly. Although the second magnetic portion has a relatively lower withstand voltage than the first magnetic portion, since the second magnetic portion is surrounded by the first magnetic portion, it is not exposed on an outer surface of a magnetic body. For this reason, a situation in which the coil and external terminal electrodes are short-circuited with the second magnetic portion therebetween is effectively curbed, and short-circuiting between the coil and the external terminal electrodes can be curbed.

公开(公告)号：US20190385792A1

公开(公告)日：2019-12-19

申请号：US16555169

申请日：2019-08-29

Applicant: TDK CORPORATION

Inventor： Hitoshi OHKUBO ,  Masazumi ARATA ,  Manabu OHTA ,  Shou KAWADAHARA ,  Yoshihiro MAEDA ,  Takahiro KAWAHARA ,  Hokuto EDA ,  Shigeki SATO

IPC: H01F41/04

Abstract: In a coil component and a method for manufacturing the same, a winding part of a coil is grown by plating so as to extend between resin walls of a resin body provided before the coil is grown by plating. The resin wall is interposed between adjacent turns of the winding part of the coil during the plating growth, and therefore contact between adjacent turns of the winding part of the coil cannot occur.

公开(公告)号：US20240194392A1

公开(公告)日：2024-06-13

申请号：US18528876

申请日：2023-12-05

Applicant: TDK CORPORATION

Inventor： Masataro SAITO ,  Hitoshi OHKUBO ,  Masazumi ARATA ,  Hokuto EDA ,  Kohei TAKAHASHI ,  Takamasa IWASAKI ,  Ryo FUKUOKA

IPC: H01F27/28

CPC classification number: H01F27/2804 ,  H01F2027/2809

Abstract: In the coil component, the thickness of the first coil portion and the thickness of the second coil portion are different from each other in the thickness direction of the substrate, thereby achieving improvement in characteristics such as self-resonance frequencies and heat dissipation.

公开(公告)号：US20230022189A1

公开(公告)日：2023-01-26

申请号：US17866837

申请日：2022-07-18

Applicant: TDK CORPORATION

Inventor： Hokuto EDA ,  Hitoshi OHKUBO ,  Masazumi ARATA ,  Masataro SAITO ,  Kohei TAKAHASHI ,  Takamasa IWASAKI

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

Abstract: In a coil component, heat radiation around a through conductor is improved. In the coil component, since the cross-sectional area of the inner end portion of the planar coil is designed to be relatively large, heat generated in the through conductor is easily transferred to the inner end portion. Since heat is efficiently transferred from the through conductor to the inner end portion, high heat radiation around the through conductor is achieved.

公开(公告)号：US20210183566A1

公开(公告)日：2021-06-17

申请号：US17115311

申请日：2020-12-08

Applicant: TDK CORPORATION

Inventor： Hitoshi OHKUBO ,  Miyuki ASAI ,  Masazumi ARATA ,  Hokuto EDA

IPC: H01F27/32 ,  H01F17/04

Abstract: In a coil component, the pressure resistance is improved by main surfaces and of a main body portion being covered with an insulating layer. The main body portion has a surface part, the resin ratio of the surface part is higher than the internal resin ratio, and insulation is enhanced at the surface part. As a result, the pressure resistance on the surface of the main body portion is further improved and the pressure resistance of the entire coil component is further improved.

公开(公告)号：US20210151234A1

公开(公告)日：2021-05-20

申请号：US17093808

申请日：2020-11-10

Applicant: TDK CORPORATION

Inventor： Hitoshi OHKUBO ,  Manabu OHTA ,  Ryo FUKUOKA ,  Hironori KIMATA

IPC: H01F17/04 ,  H01F27/28

Abstract: In a coil component, a height h1 of a pedestal portion of a resin wall corresponds to the height position of a step portion. In addition, a height of a seed portion corresponds to the plating start position at a time when a winding portion of a coil is plated and grown. The plating start position and the step portion are designed to be close to each other by the height h1 of the pedestal portion and the height h2 of the seed portion satisfying 0.3≤h1/h2≤10. Accordingly, although the coil component has a configuration in which the resin wall has the step portion, the inside of the step portion is sufficiently filled with a coil conductor, and thus deterioration of characteristics is suppressed.