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: 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: 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: 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: 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
  • Publication number: 20200143979
    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: Application
    Filed: October 24, 2019
    Publication date: May 7, 2020
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Masazumi ARATA, Kenichi KAWABATA, Atsushi SATO
  • Publication number: 20200135371
    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 25, 2019
    Publication date: April 30, 2020
    Applicant: TDK CORPORATION
    Inventors: Kyohei TONOYAMA, Ken SATOH, Kentaro SAITO, Miyuki ASAI, Hitoshi OHKUBO
  • Publication number: 20200135380
    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: Application
    Filed: October 25, 2019
    Publication date: April 30, 2020
    Applicant: TDK CORPORATION
    Inventors: Kyohei TONOYAMA, Ken SATOH, Kentaro SAITO, Miyuki ASAI, Hitoshi OHKUBO
  • Patent number: 10559417
    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: Grant
    Filed: May 27, 2016
    Date of Patent: February 11, 2020
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Masazumi Arata, Manabu Ohta, Yuuya Kaname, Yoshihiro Maeda, Takahiro Kawahara, Hokuto Eda, Shigeki Sato
  • Publication number: 20190385792
    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: August 29, 2019
    Publication date: December 19, 2019
    Inventors: Hitoshi OHKUBO, Masazumi ARATA, Manabu OHTA, Shou KAWADAHARA, Yoshihiro MAEDA, Takahiro KAWAHARA, Hokuto EDA, Shigeki SATO
  • Patent number: 10468184
    Abstract: In a coil component 1 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: November 24, 2015
    Date of Patent: November 5, 2019
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Masazumi Arata, Manabu Ohta, Shou Kawadahara, Yoshihiro Maeda, Takahiro Kawahara, Hokuto Eda, Shigeki Sato
  • Patent number: 10210974
    Abstract: In a coil component (planar coil element), at least part of a third metal magnetic powder constituting a metal magnetic powder and having a minimum average grain diameter is uncoated, which suppresses a reduction in magnetic permeability. On the other hand, the remaining metal powders are coated with glass, which improves the insulating properties of a metal magnetic powder-containing resin and reduces core loss.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: February 19, 2019
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Masazumi Arata, Manabu Ohta, Shou Kawadahara, Yoshihiro Maeda, Takahiro Kawahara, Hokuto Eda, Shigeki Sato
  • Publication number: 20190013148
    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: Application
    Filed: July 5, 2018
    Publication date: January 10, 2019
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Masazumi ARATA, Takahiro KAWAHARA, Hokuto EDA, Hiroki TSUJIAI
  • Publication number: 20190013145
    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: Application
    Filed: July 5, 2018
    Publication date: January 10, 2019
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Masazumi ARATA, Takahiro KAWAHARA, Hokuto EDA, Hiroki TSUJIAI
  • Publication number: 20190002784
    Abstract: This disclosure generally relates to a lubricating oil composition having a HTHS viscosity at 150° C. in a range of about 1.3 to about 2.5 cP, comprising: (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100° C. in a range of 1.5 to 6.0 mm2/s; and (b) an overbased metal salt of an alkyl-substituted detergent.
    Type: Application
    Filed: June 28, 2018
    Publication date: January 3, 2019
    Inventors: Alexander Bowman Boffa, Jacob Daniel Ward, Brendan P. Miller, Isao Tanaka, Hitoshi Ohkubo, Koichi Kubo, John Robert Miller, Curtis Bay Campbell
  • Patent number: 10147540
    Abstract: In a planar coil element and a method for producing the same, a metal magnetic powder-containing resin containing an oblate or needle-like first metal magnetic powder contains a second metal magnetic powder having an average particle size (1 ?m) smaller than that (32 ?m) of the first metal magnetic powder, which significantly reduces the viscosity of the metal magnetic powder-containing resin. Therefore, the metal magnetic powder-containing resin is easy to handle when applied to enclose a coil unit, which makes it easy to produce the planar coil element.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: December 4, 2018
    Assignee: TDK CORPORATION
    Inventors: Kyohei Tonoyama, Makoto Morita, Tomokazu Ito, Hitoshi Ohkubo, Manabu Ohta, Yoshihiro Maeda, Yuuya Kaname, Hideharu Moro
  • Publication number: 20180258365
    Abstract: A lubricating oil composition having a high temperature high shear (HTHS) viscosity at 150° C. in a range of about 1.3 to about 2.3 cP is disclosed. The composition comprises (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100° C. in a range of 1.5 to 6.0 mm2/s; (b) an organomolybdenum compound providing 200 to 1500 ppm by weight of molybdenum to the lubricating oil composition; (c) a calcium-containing detergent providing 750 to 3000 ppm by weight of calcium to the lubricating oil composition; (d) a magnesium-containing detergent providing 200 to 1500 ppm by weight of magnesium to the lubricating oil composition; and (e) a viscosity modifier having a PSSI of 30 or less.
    Type: Application
    Filed: March 8, 2017
    Publication date: September 13, 2018
    Inventors: Hitoshi Ohkubo, Koichi Kubo, Isao Tanaka, John Robert Miller
  • Publication number: 20180258366
    Abstract: A lubricating oil composition having a high temperature high shear (HTHS) viscosity at 150° C. in a range of about 1.3 to about 2.3 cP is disclosed. The composition comprises (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100° C. in a range of 1.5 to 6.0 mm2/s; and (b) a molybdenum-succinimide complex providing 200 to 1500 ppm by weight of molybdenum to the lubricating oil composition.
    Type: Application
    Filed: March 8, 2017
    Publication date: September 13, 2018
    Inventors: Hitoshi Ohkubo, Koichi Kubo, Isao Tanaka
  • Publication number: 20170154720
    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: Application
    Filed: November 29, 2016
    Publication date: June 1, 2017
    Inventors: Hitoshi OHKUBO, Kyohei TONOYAMA, Shigeki SATO
  • Publication number: 20160351316
    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: May 27, 2016
    Publication date: December 1, 2016
    Applicant: TDK CORPORATION
    Inventors: Hitoshi OHKUBO, Masazumi ARATA, Manabu OHTA, Yuuya KANAME, Yoshihiro MAEDA, Takahiro KAWAHARA, Hokuto EDA, Shigeki SATO
  • Patent number: 9406420
    Abstract: A coil component 1 is provided with coil conductors 10a and 10b and a magnetic metal powder containing resin 22 (22a and 22b) covering the coil conductors 10a and 10b. The magnetic metal powder containing resin 22 includes first metal powder having a first average grain diameter, second metal powder having a second average grain diameter that is smaller than the first average grain diameter, and third metal powder having a third average grain diameter that is smaller than the second average grain diameter. The first average grain diameter is 15 ?m or more and 100 ?m or less. The third average grain diameter is 2 ?m or less. The first metal powder mainly contains Permalloy and the second and third metal powders mainly contain carbonyl iron.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: August 2, 2016
    Assignee: TDK CORPORATION
    Inventors: Hitoshi Ohkubo, Kyohei Tonoyama, Makoto Morita, Tomokazu Ito, Hideto Itoh, Yoshihiro Maeda, Manabu Ohta, Yuuya Kaname, Takahiro Kawahara