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: 20220037068
    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: Application
    Filed: October 15, 2021
    Publication date: February 3, 2022
    Applicant: TDK CORPORATION
    Inventors: Kyohei TONOYAMA, Ken SATOH, Kentaro SAITO, Miyuki ASAI, Hitoshi OHKUBO
  • Patent number: 11183320
    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 25, 2019
    Date of Patent: November 23, 2021
    Assignee: TDK CORPORATION
    Inventors: Kyohei Tonoyama, Ken Satoh, Kentaro Saito, Miyuki Asai, Hitoshi Ohkubo
  • Publication number: 20210327637
    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: Application
    Filed: April 19, 2021
    Publication date: October 21, 2021
    Applicant: TDK CORPORATION
    Inventors: Hokuto EDA, Masataro SAITO, Kohei TAKAHASHI, Takamasa IWASAKI, Hitoshi OHKUBO, Masazumi ARATA
  • Publication number: 20210225588
    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.
    Type: Application
    Filed: April 7, 2021
    Publication date: July 22, 2021
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Masazumi ARATA, Manabu OHTA, Shou KAWADAHARA, Yoshihiro MAEDA, Takahiro KAWAHARA, Hokuto EDA, Shigeki SATO
  • Patent number: 11049641
    Abstract: A coil device comprising a coil, and a magnetic metal powder containing resin covering said coil. Said magnetic metal powder comprises at least two types of magnetic metal powders with different D50. The magnetic metal powder having larger D50 is defined as a large diameter powder, and the magnetic metal powder having smaller D50 is defined as a small diameter powder among the two types of said magnetic metal powder. Said large diameter powder is made of iron or iron based alloy. Said small diameter powder is made of Ni—Fe alloy. Said small diameter powder has D50 of 0.5 to 1.5 ?m. Said large diameter powder and said small diameter powder respectively comprises an insulation coating layer.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: June 29, 2021
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Kyohei Tonoyama, Shigeki Sato
  • Patent number: 11043329
    Abstract: In a planar coil element, a dead space in a non-overlapping region is reduced by designing a total width of a first resin wall and a first turn located in the non-overlapping region to be narrow, more specifically, by designing the total width to be narrower than a total width of a second turn outside the first turn and a second resin wall located inside the turn and also than a total width of a third turn on the outer side and a third resin wall located inside the turn. As a result, a volume of a magnetic element body in a magnetic core portion of a coil can be increased, and an, inductance value, which is a magnetic characteristic, can also be improved.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: June 22, 2021
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Masazumi Arata, Takahiro Kawahara, Hokuto Eda, Hiroki Tsujiai
  • Publication number: 20210183566
    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: Application
    Filed: December 8, 2020
    Publication date: June 17, 2021
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Miyuki ASAI, Masazumi ARATA, Hokuto EDA
  • Publication number: 20210151234
    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: Application
    Filed: November 10, 2020
    Publication date: May 20, 2021
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Manabu OHTA, Ryo FUKUOKA, Hironori KIMATA
  • Publication number: 20210151248
    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: Application
    Filed: November 10, 2020
    Publication date: May 20, 2021
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Kenei ONUMA, Masazumi ARATA, Masataro SAITO, Kohei TAKAHASHI
  • Patent number: 10998130
    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.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: May 4, 2021
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Masazumi Arata, Manabu Ohta, Shou Kawadahara, Yoshihiro Maeda, Takahiro Kawahara, Hokuto Eda, Shigeki Sato
  • Patent number: 10943719
    Abstract: In a coil component, an insulation layer covers an upper surface of a conductor pattern. Accordingly, insulating properties between the conductor pattern and a magnetic body are enhanced, and insulating properties between the conductor patterns are enhanced. In addition, in the coil component, the magnetic body enters a space between resin walls such that the insulation layer is covered. Therefore, a volume of the magnetic body above the conductor pattern is increased, and high coil characteristics are realized.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: March 9, 2021
    Assignee: TDK CORPORATION
    Inventors: Miyuki Asai, Hokuto Eda, Masazumi Arata, Hitoshi Ohkubo
  • Publication number: 20200373061
    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: Application
    Filed: May 19, 2020
    Publication date: November 26, 2020
    Applicant: TDK CORPORATION
    Inventors: Miyuki ASAI, Takahiro KAWAHARA, Masazumi ARATA, Hitoshi OHKUBO
  • Publication number: 20200373050
    Abstract: In a coil component, an insulation layer covers an upper surface of a conductor pattern. Accordingly, insulating properties between the conductor pattern and a magnetic body are enhanced, and insulating properties between the conductor patterns are enhanced. In addition, in the coil component, the magnetic body enters a space between resin walls such that the insulation layer is covered. Therefore, a volume of the magnetic body above the conductor pattern is increased, and high coil characteristics are realized.
    Type: Application
    Filed: May 19, 2020
    Publication date: November 26, 2020
    Applicant: TDK CORPORATION
    Inventors: Miyuki ASAI, Hokuto EDA, Masazumi ARATA, Hitoshi OHKUBO
  • Publication number: 20200373064
    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: Application
    Filed: May 19, 2020
    Publication date: November 26, 2020
    Applicant: TDK CORPORATION
    Inventors: Miyuki ASAI, Hokuto EDA, Masazumi ARATA, Hitoshi OHKUBO
  • Publication number: 20200373077
    Abstract: 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.
    Type: Application
    Filed: May 19, 2020
    Publication date: November 26, 2020
    Applicant: TDK CORPORATION
    Inventors: Kenei ONUMA, Masazumi ARATA, Hitoshi OHKUBO
  • Patent number: 10847312
    Abstract: In a planar coil element, since an overlapping portion of a fourth resin wall of a first conductor pattern protrudes from an end surface of a main body portion, restriction on a width of the overlapping portion is relaxed, and the wide overlapping portion is realized. Therefore, an improvement in a withstand voltage between the second external terminal electrode formed on the end surface and an outermost turn of the first conductor pattern is realized. Similarly, regarding the second conductor pattern, the improvement in the withstand voltage between the first external terminal electrode formed on the end surface and an outermost turn of the second conductor pattern is realized.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: November 24, 2020
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Masazumi Arata, Takahiro Kawahara, Hokuto Eda, Hiroki Tsujiai
  • Publication number: 20200279678
    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. The thickness of each of the soft magnetic layers is 10 ?m or more and 30 ?m or less. A structure made of Fe-based nano-crystals is observed in the soft magnetic layers.
    Type: Application
    Filed: February 25, 2020
    Publication date: September 3, 2020
    Applicant: TDK CORPORATION
    Inventors: Kazuhiro Yoshidome, Hiroyuki Matsumoto, Hitoshi Ohkubo, Atsuyuki Nakano
  • Publication number: 20200279675
    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: Application
    Filed: February 25, 2020
    Publication date: September 3, 2020
    Applicant: TDK CORPORATION
    Inventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Hitoshi OHKUBO, Atsuyuki NAKANO
  • Publication number: 20200279674
    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. The volume occupation of a magnetic material in the laminated body is 50% or more and 99.5% or less. A structure consisting of Fe-based nanocrystals is observed in the soft magnetic layers.
    Type: Application
    Filed: February 25, 2020
    Publication date: September 3, 2020
    Applicant: TDK CORPORATION
    Inventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Hitoshi OHKUBO, Atsuyuki NAKANO
  • Publication number: 20200143980
    Abstract: A coil component in which a change in thicknesses of the winding part is prevented is provided. According to the coil component, since each of a pair of neighboring resin walls and a seed part between the pair of resin walls are separated by a predetermined distance, a plating part grown on the seed part is easy to grow uniformly between the pair of neighboring resin walls. For this reason, the winding part whose surface is gentle and in which a change in thickness is prevented is obtained by plating growth.
    Type: Application
    Filed: January 3, 2020
    Publication date: May 7, 2020
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Masazumi ARATA, Manabu OHTA, Yuuya KANAME, Yoshihiro MAEDA, Takahiro KAWAHARA, Hokuto EDA, Shigeki SATO