公开(公告)号：US20230063586A1

公开(公告)日：2023-03-02

申请号：US17898767

申请日：2022-08-30

申请人： TDK CORPORATION

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

IPC分类号： H01F1/14 ,  H01F5/04 ,  H01F5/06

摘要： 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：US20220037068A1

公开(公告)日：2022-02-03

申请号：US17502323

申请日：2021-10-15

申请人： TDK CORPORATION

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

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

摘要： 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

申请人： TDK CORPORATION

发明人： Miyuki ASAI ,  Hokuto EDA ,  Masazumi ARATA ,  Hitoshi OHKUBO

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

摘要： 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

申请人： TDK CORPORATION

发明人： Miyuki ASAI ,  Takahiro KAWAHARA ,  Masazumi ARATA ,  Hitoshi OHKUBO

IPC分类号： H01F27/255 ,  H01F5/06

摘要： 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

申请人： TDK CORPORATION

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

IPC分类号： H01F41/04

摘要： 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：US20230022189A1

公开(公告)日：2023-01-26

申请号：US17866837

申请日：2022-07-18

申请人： TDK CORPORATION

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

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

摘要： 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

申请人： TDK CORPORATION

发明人： Hitoshi OHKUBO ,  Miyuki ASAI ,  Masazumi ARATA ,  Hokuto EDA

IPC分类号： H01F27/32 ,  H01F17/04

摘要： 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

申请人： TDK CORPORATION

发明人： Hitoshi OHKUBO ,  Manabu OHTA ,  Ryo FUKUOKA ,  Hironori KIMATA

IPC分类号： H01F17/04 ,  H01F27/28

摘要： 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.

公开(公告)号：US20200373077A1

公开(公告)日：2020-11-26

申请号：US16877831

申请日：2020-05-19

申请人： TDK CORPORATION

发明人： Kenei ONUMA ,  Masazumi ARATA ,  Hitoshi OHKUBO

IPC分类号： H01F27/32 ,  H01F27/28

摘要： An upper end portion and a lower end portion of a second magnetic portion of a coil component are further away from a coil than when a third part and a fifth part are not present. For this reason, a magnetic flux is unlikely to be concentrated in the upper end portion and the lower end portion of the second magnetic portion, so that magnetic saturation is unlikely to occur. Therefore, improvement of direct current superimposition characteristics is realized in the coil component.

公开(公告)号：US20200279675A1

公开(公告)日：2020-09-03

申请号：US16800299

申请日：2020-02-25

申请人： TDK CORPORATION

发明人： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Hitoshi OHKUBO ,  Atsuyuki NAKANO

IPC分类号： H01F1/147 ,  H01F27/245 ,  C22C38/12 ,  C22C38/02 ,  C22C38/00

摘要： A coil component having high inductance while suppressing core loss is obtained. The coil component includes a coil and a magnetic core. The magnetic core has a laminated body in which soft magnetic layers are laminated. Micro gaps are formed in the soft magnetic layers. The soft magnetic layers are divided into at least two or more small pieces by the micro gaps. A structure made of Fe-based nano-crystals is observed in the soft magnetic layers.