Patents by Inventor Hitoshi Ohkubo

Hitoshi Ohkubo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250111968
    Abstract: A soft magnetic metal powder includes soft magnetic metal particles with a particle size of 5.0 ?m or more. (y95/y50?y90/y50)/(0.95?0.90) is 20.0 or less, where y95 (?m) denotes D95, y90 (?m) denotes D90, and y50 (?m) denotes D50 of a particle size distribution of the soft magnetic metal particles with a particle size of 5.0 ?m or more. A magnetic core includes soft magnetic metal particles with a Heywood diameter of 5.0 ?m or more in a section of the magnetic core. (Y95/Y50?Y90/Y50)/(0.95?0.90) is 20.0 or less, where Y95 (?m) denotes D95, Y90 (?m) denotes D90, and Y50 (?m) denotes D50 of a particle size distribution of the soft magnetic metal particles with a Heywood diameter of 5.0 ?m or more.
    Type: Application
    Filed: September 27, 2024
    Publication date: April 3, 2025
    Applicant: TDK Corporation
    Inventors: Kazuhiro YOSHIDOME, Hiroyuki Matsumoto, Shota Otsuka, Masashi Ito, Hitoshi Ohkubo
  • Publication number: 20240331930
    Abstract: A coil component, which is a kind of electronic component, is designed such that the resistivity of second electrode layers of external terminal electrodes are lower than the resistivity of first electrode layers. Therefore, the electric resistance when the voltage is applied between the external terminal electrodes and the current flows through the portion covering end surfaces is reduced as a whole of the external terminal electrode as compared with the electric resistance of an external terminal electrode constituted only by the first electrode layer.
    Type: Application
    Filed: March 26, 2024
    Publication date: October 3, 2024
    Applicant: TDK CORPORATION
    Inventors: Hokuto EDA, Hitoshi OHKUBO, Masazumi ARATA, Kohei TAKAHASHI, Takamasa IWASAKI
  • Publication number: 20240331933
    Abstract: In the coil component, the edge of the aperture of the protection film covering the coil from the lower surface side of the element body does not extend in the same plane. In this case, even if a crack occurs in the joint region between the coil and the bump electrode, the crack is less likely to cross the joint region as compared with the case where the edge extends in the same plane. Therefore, in the coil component, the crack is effectively suppressed.
    Type: Application
    Filed: March 27, 2024
    Publication date: October 3, 2024
    Applicant: TDK Corporation
    Inventors: Hokuto EDA, Takahiro Nemoto, Manabu Ohta, Ryo Fukuoka, Masazumi Arata, Hitoshi Ohkubo
  • Publication number: 20240331905
    Abstract: In the coil component, the terminal electrode enters an aperture of the element body and is jointed with the bump electrode inside the element body. That is, the terminal electrode is in contact with both the bump electrode and the element body. Therefore, as compared with the case where the bump electrode is exposed to the lower surface of the element body, a joint surface of the terminal electrode is enlarged, and high adhesion of the terminal electrode is realized.
    Type: Application
    Filed: March 27, 2024
    Publication date: October 3, 2024
    Applicant: TDK Corporation
    Inventors: Manabu OHTA, Ryo Fukuoka, Yuji Matsuura, Hokuto Eda, Takahiro Nemoto, Kenei Onuma, Masazumi Arata, Hitoshi Ohkubo
  • Publication number: 20240331926
    Abstract: In the coil component, the lower end portion of the bump electrode protruding from the lower surface of the element body includes a flange portion, and the lower surface of the lower end portion is concave-convex. Therefore, compared to the case where the bump electrode is exposed in the form of a flat surface so as to be flat with the lower surface of the element body, the contact areas between the bump electrodes and the terminal electrodes are increased, and high connection reliability between the bump electrodes and the terminal electrodes is realized.
    Type: Application
    Filed: March 27, 2024
    Publication date: October 3, 2024
    Applicant: TDK Corporation
    Inventors: Manabu OHTA, Ryo FUKUOKA, Yuji MATSUURA, Hokuto EDA, Takahiro NEMOTO, Kenei ONUMA, Masazumi ARATA, Hitoshi OHKUBO
  • Publication number: 20240331904
    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.
    Type: Application
    Filed: March 26, 2024
    Publication date: October 3, 2024
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Hokuto EDA, Masazumi ARATA, Miyuki ASAI, Takahiro HOSOKAWA, Yuji MATSUURA
  • Patent number: 12094636
    Abstract: In an insulation layer of a coil component, a thickness of a second covering part and a third covering part located on the penetration hole side of a first covering part is thinner than that of the first covering part. A stray capacitance occurring between a flat coil pattern and external terminal electrodes is reduced by making the first covering part of the insulation layer thicker than the second covering part and the third covering part. Further, since the second covering part and the third covering part of the insulation layers are thinner than the first covering part, a magnetic volume is increased while external dimensions of the base body is maintained, and thus a high inductance is realized.
    Type: Grant
    Filed: April 19, 2021
    Date of Patent: September 17, 2024
    Assignee: TDK CORPORATION
    Inventors: Hokuto Eda, Masataro Saito, Kohei Takahashi, Takamasa Iwasaki, Hitoshi Ohkubo, Masazumi Arata
  • Patent number: 12087497
    Abstract: In a coil component, a main body portion is made of a metal magnetic powder-containing resin, and thus a resin component appears on end surfaces of the main body portion. In addition, since external terminal electrodes are made of a conductive resin, a resin component also appears on the surfaces of the external terminal electrodes. Accordingly, insulating coating layers are integrally covered with high adhesion with the end surfaces of the main body portion and the external terminal electrodes by the insulating coating layers coming into contact with the end surfaces of the main body portion so as to straddle the external terminal electrodes.
    Type: Grant
    Filed: November 10, 2020
    Date of Patent: September 10, 2024
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Kenei Onuma, Masazumi Arata, Masataro Saito, Kohei Takahashi
  • Patent number: 12020854
    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.
    Type: Grant
    Filed: December 8, 2020
    Date of Patent: June 25, 2024
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Miyuki Asai, Masazumi Arata, Hokuto Eda
  • Publication number: 20240194392
    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.
    Type: Application
    Filed: December 5, 2023
    Publication date: June 13, 2024
    Applicant: TDK CORPORATION
    Inventors: Masataro SAITO, Hitoshi OHKUBO, Masazumi ARATA, Hokuto EDA, Kohei TAKAHASHI, Takamasa IWASAKI, Ryo FUKUOKA
  • Patent number: 11961652
    Abstract: In a coil component, a shield layer is provided after the unevenness of the surface of an element body is smoothened by the surface being covered with an insulating layer. A Cu layer of the shield layer is provided on a smooth surface, and thus a thickness variation can be suppressed and the Cu layer can be formed with a substantially uniform thickness. In the coil component, a point where the shield layer is thin or a point lacking the shield layer is unlikely to be generated and a functional degradation of the shield layer is effectively suppressed.
    Type: Grant
    Filed: October 24, 2019
    Date of Patent: April 16, 2024
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Masazumi Arata, Kenichi Kawabata, Atsushi Sato
  • Patent number: 11894174
    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.
    Type: Grant
    Filed: November 10, 2020
    Date of Patent: February 6, 2024
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Manabu Ohta, Ryo Fukuoka, Hironori Kimata
  • Patent number: 11705265
    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.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: July 18, 2023
    Assignee: TDK CORPORATION
    Inventors: Miyuki Asai, Takahiro Kawahara, Masazumi Arata, Hitoshi Ohkubo
  • Patent number: 11705270
    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.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: July 18, 2023
    Assignee: TDK CORPORATION
    Inventors: Miyuki Asai, Hokuto Eda, Masazumi Arata, Hitoshi Ohkubo
  • Patent number: 11682507
    Abstract: 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.
    Type: Grant
    Filed: February 25, 2020
    Date of Patent: June 20, 2023
    Assignee: TDK CORPORATION
    Inventors: Kazuhiro Yoshidome, Hiroyuki Matsumoto, Hitoshi Ohkubo, Atsuyuki Nakano
  • Patent number: 11680307
    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 ?m or more and 60 ?m or less. A particle size of the intermediate size powder is 2.0 ?m or more and less than 10 ?m. A particle size of the small size powder is 0.1 ?m or more and less than 2.0 ?m. 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.
    Type: Grant
    Filed: October 15, 2021
    Date of Patent: June 20, 2023
    Assignee: TDK CORPORATION
    Inventors: Kyohei Tonoyama, Ken Satoh, Kentaro Saito, Miyuki Asai, Hitoshi Ohkubo
  • Patent number: 11657949
    Abstract: A magnetic core and a coil component with excellent permeability, core loss, DC superimposition property, and withstand voltage. A magnetic core has a metal magnetic powder containing resin including a metal magnetic powder. The metal magnetic powder includes a large size powder, an intermediate size powder, and a small size powder. A particle size of the large size powder is 10 ?m or more and 60 ?m or less. A particle size of the intermediate size powder is 2.0 ?m or more and less than 10 ?m. A particle size of the small size powder is 0.1 ?m or more and less than 2.0 ?m. The large size powder includes a nano crystal. A ratio of the large size powder existing with respect to the metal magnetic powder is 39% or more and 91% or less in terms of an area ratio in a cross section of the magnetic core.
    Type: Grant
    Filed: October 25, 2019
    Date of Patent: May 23, 2023
    Assignee: TDK CORPORATION
    Inventors: Kyohei Tonoyama, Ken Satoh, Kentaro Saito, Miyuki Asai, Hitoshi Ohkubo
  • Publication number: 20230072929
    Abstract: In the coil component, external stress applied when the upper coil structure, the lower coil structure, and the magnetic sheet are stacked is dispersed by the undulation of both main surfaces of the magnetic sheet. By dispersing the stress in this manner, a situation in which defects such as cracks occur in the coil structure is effectively suppressed.
    Type: Application
    Filed: August 30, 2022
    Publication date: March 9, 2023
    Applicant: TDK CORPORATION
    Inventors: Hokuto EDA, Hitoshi OHKUBO, Masazumi ARATA, Masataro SAITO, Kohei TAKAHASHI, Takamasa IWASAKI
  • Publication number: 20230066655
    Abstract: In the coil component, since the contact area between the external terminal electrode and the element body is increased by the protrusion of the external terminal electrode, the external terminal electrode and the element body are more closely attached to each other. Therefore, the attachment strength between the external terminal electrode and the element body can be improved. Hence, it is possible to suppress peeling of the external terminal electrode from the element body.
    Type: Application
    Filed: August 22, 2022
    Publication date: March 2, 2023
    Applicant: TDK CORPORATION
    Inventors: Hokuto EDA, Hitoshi OHKUBO, Masazumi ARATA, Masataro SAITO, Kohei TAKAHASHI, Takamasa IWASAKI, Manabu OHTA, Kenei ONUMA
  • Patent number: D1053135
    Type: Grant
    Filed: December 27, 2021
    Date of Patent: December 3, 2024
    Assignee: TDK CORPORATION
    Inventors: Hokuto Eda, Hitoshi Ohkubo, Masazumi Arata, Masataro Saito, Kohei Takahashi, Takamasa Iwasaki