Patents by Inventor Hiroshi Marusawa

Hiroshi Marusawa 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: 20230386725
    Abstract: A coil component that suppresses a decrease in adhesion in a magnetic adhesive. The coil component includes a core and a top plate. The core and the top plate are made of magnetic materials. The coil component includes a first wire and a second wire. The first wire and the second wire are wound around the core. The coil component includes an adhesive. The adhesive is interposed between the core and the top plate. The adhesive adheres the core to the top plate. The adhesive includes a thermosetting resin, a metal powder made of a soft magnetic material, and a ferrite powder.
    Type: Application
    Filed: August 9, 2023
    Publication date: November 30, 2023
    Applicant: Murata Manufacturing Co., Ltd.
    Inventor: Hiroshi MARUSAWA
  • Patent number: 11794243
    Abstract: A method for manufacturing a magnetic powder includes a step of producing a magnetic powder by spray-drying a spray liquid containing first magnetic particles, second magnetic particles, a thermosetting resin, and an organic solvent. A magnetic powder includes first magnetic particles and a thermosetting resin coating film on surfaces of the first magnetic particles. The first magnetic particles are soft magnetic metal particles. The resin coating film contains second magnetic particles. The second magnetic particles have a smaller average particle size than the first magnetic particles.
    Type: Grant
    Filed: July 2, 2021
    Date of Patent: October 24, 2023
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Hiroshi Marusawa
  • Publication number: 20220108824
    Abstract: An inductor includes a body containing soft magnetic powder and resin, a coil embedded in the body, outer electrodes on the body, and a protective film on the surface of the body. The protective film has a thickness of 10 ?m or more and contains silica particles and resin. In the protective film, the silica particles have an average diameter of 15 nm to 75 nm, and the percentage by weight of the silica particles to the resin is between 150% and 250%.
    Type: Application
    Filed: October 5, 2021
    Publication date: April 7, 2022
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Eiji ISO, Yuki KITASHIMA, Yoshiharu SATOU, Noriyuki OOKAWA, Hiroshi MARUSAWA
  • Publication number: 20220108832
    Abstract: A coil component includes a core having a winding core portion, a first flange portion disposed on a first end portion of the winding core portion, and a second flange portion disposed on a second end portion of the winding core portion; a wire winding on the winding core portion of the core; and a plate member disposed so as to bridge the first flange portion and the second flange portion. The coil component further includes an adhesive portion disposed between the first flange portion and the plate member and adhering the first flange portion to the plate member, and an adhesive portion disposed between the second flange portion and the plate member and adhering the second flange portion to the plate member. The adhesive portion contains a resin and magnetic powder.
    Type: Application
    Filed: September 10, 2021
    Publication date: April 7, 2022
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Kenta KONDO, Hiroyuki HONDA, Hiroshi MARUSAWA
  • Publication number: 20220062987
    Abstract: A method for manufacturing a magnetic powder includes a step of producing a magnetic powder by spray-drying a spray liquid containing first magnetic particles, second magnetic particles, a thermosetting resin, and an organic solvent. A magnetic powder includes first magnetic particles and a thermosetting resin coating film on surfaces of the first magnetic particles. The first magnetic particles are soft magnetic metal particles. The resin coating film contains second magnetic particles. The second magnetic particles have a smaller average particle size than the first magnetic particles.
    Type: Application
    Filed: July 2, 2021
    Publication date: March 3, 2022
    Applicant: Murata Manufacturing Co., Ltd.
    Inventor: Hiroshi MARUSAWA
  • Publication number: 20220020515
    Abstract: A coil component is capable of suppressing permeation of liquid or gas into a magnetic portion and increasing mechanical strength of the magnetic portion. A coil component includes a magnetic portion including soft magnetic metal particles having an insulating oxide layer on a surface thereof, with the soft magnetic metal particles being bonded to each other with the insulating oxide layer interposed therebetween; and a coil portion provided inside or on the surface of the magnetic portion. A mixture containing a resin and inorganic particles is disposed between the soft magnetic metal particles.
    Type: Application
    Filed: July 9, 2021
    Publication date: January 20, 2022
    Applicant: Murata Manufacturing Co., Ltd.
    Inventor: Hiroshi MARUSAWA
  • Patent number: 10983012
    Abstract: A temperature sensor that includes a first electrode layer, a second electrode layer, and a thermistor layer between the first and second electrode layers. The thermistor layer includes a spinel-type semiconductor ceramic composition powder containing Mn, Ni, and Fe, and an organic polymer component. In the semiconductor ceramic composition powder, the molar ratio of Mn to Ni is 85/15?Mn/Ni?65/35, and when the total molar quantity of Mn and Ni is 100 parts by mole, the content of Fe is 30 parts by mole or less, and the semiconductor ceramic composition powder is 2 ?m or less in particle size.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: April 20, 2021
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Yasunori Hioki, Hiroshi Marusawa, Michiru Mikami
  • Patent number: 10832878
    Abstract: A rotary encoder includes a shaft and an encoder mechanism that holds the shaft in a rotatably inserted state and detects a rotation direction and a rotation angle of the shaft. The encoder mechanism includes a substrate that rotatably holds the shaft, an insulator portion and a resistor portion provided on one surface of the substrate and alternately provided in the rotation direction of the shaft, a rotor attached to the shaft so as to be integrally rotatable with the shaft, and a slider that is attached to the rotor and alternately slidably contacts the insulator portion and the resistor portion by rotation of the shaft. The insulator portion includes a base material made of a resin, spherical silica, and a fluororesin filler.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: November 10, 2020
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Hiroshi Marusawa, Yoshiaki Nomura, Hiroyuki Kishishita, Masakazu Murata
  • Publication number: 20190237280
    Abstract: A rotary encoder includes a shaft and an encoder mechanism that holds the shaft in a rotatably inserted state and detects a rotation direction and a rotation angle of the shaft. The encoder mechanism includes a substrate that rotatably holds the shaft, an insulator portion and a resistor portion provided on one surface of the substrate and alternately provided in the rotation direction of the shaft, a rotor attached to the shaft so as to be integrally rotatable with the shaft, and a slider that is attached to the rotor and alternately slidably contacts the insulator portion and the resistor portion by rotation of the shaft. The insulator portion includes a base material made of a resin, spherical silica, and a fluororesin filler.
    Type: Application
    Filed: April 12, 2019
    Publication date: August 1, 2019
    Inventors: Hiroshi MARUSAWA, Yoshiaki NOMURA, Hiroyuki KISHISHITA, Masakazu MURATA
  • Publication number: 20180164162
    Abstract: A temperature sensor that includes a first electrode layer, a second electrode layer, and a thermistor layer between the first and second electrode layers. The thermistor layer includes a spinel-type semiconductor ceramic composition powder containing Mn, Ni, and Fe, and an organic polymer component. In the semiconductor ceramic composition powder, the molar ratio of Mn to Ni is 85/15?Mn/Ni?65/35, and when the total molar quantity of Mn and Ni is 100 parts by mole, the content of Fe is 30 parts by mole or less, and the semiconductor ceramic composition powder is 2 ?m or less in particle size.
    Type: Application
    Filed: January 25, 2018
    Publication date: June 14, 2018
    Inventors: Yasunori Hioki, Hiroshi Marusawa, Michiru Mikami
  • Patent number: 9711270
    Abstract: A common mode choke coil as an electronic component includes a laminate. The laminate includes insulating layers stacked in a thickness direction and has a recess sinking in a stacking direction of the insulating layers. The laminate includes at least one coil conductor therein. The recess is filled with a magnetic resin material. The magnetic resin material is formed of a magnetic powder-containing resin that is a mixture of a soft magnetic metal powder and a thermosetting resin. The soft magnetic metal powder has an average particle size of 12 ?m or less. The magnetic powder-containing resin contains 65 vol % or more and 85 vol % or less of the soft magnetic metal powder.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: July 18, 2017
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiroshi Marusawa, Takaomi Toi, Kosuke Ishida, Mizuho Katsuta
  • Publication number: 20160247623
    Abstract: A common mode choke coil as an electronic component includes a laminate. The laminate includes insulating layers stacked in a thickness direction and has a recess sinking in a stacking direction of the insulating layers. The laminate includes at least one coil conductor therein. The recess is filled with a magnetic resin material. The magnetic resin material is formed of a magnetic powder-containing resin that is a mixture of a soft magnetic metal powder and a thermosetting resin. The soft magnetic metal powder has an average particle size of 12 ?m or less. The magnetic powder-containing resin contains 65 vol % or more and 85 vol % or less of the soft magnetic metal powder.
    Type: Application
    Filed: February 18, 2016
    Publication date: August 25, 2016
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Hiroshi MARUSAWA, Takaomi TOI, Kosuke ISHIDA, Mizuho KATSUTA
  • Patent number: 9318255
    Abstract: A coil component that includes a drum-shaped core with an upper flange and a lower flange, a winding wound around the core, and an exterior resin between the upper flange and lower flange of the core. The exterior resin includes an inorganic filler at 91 to 95 mass % with respect to the exterior resin, and a resin that has more than one glass transition temperature and has a phase-separated structure. A flange spacing distance between the upper flange and the lower flange is 1.0 mm or less.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: April 19, 2016
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Hiroyuki Masaki, Nobuyuki Kinami, Hiroshi Marusawa
  • Patent number: 9214263
    Abstract: This disclosure provides a magnetic material-containing resin to be used for coating and forming cores. A magnetite-containing resin of the present invention includes a magnetite having a residual magnetic flux density of less than 15 Am2/kg and a coercive force of less than 12 kA/m. A coil is provided that has a structure in which by coating a winding with the magnetite-containing resin, a magnetite-containing resin layer is formed.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: December 15, 2015
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiroshi Marusawa, Akio Hagiya
  • Publication number: 20150022309
    Abstract: A magnetic metal-containing resin that includes 70 to 88 mass % of a magnetic metal powder and 5.0 mass % or more of an oxide, and the oxide is 2.8 ?m or more in average particle size. The magnetic metal-containing resin preferably includes 10 mass % or more of the oxide.
    Type: Application
    Filed: October 6, 2014
    Publication date: January 22, 2015
    Inventor: Hiroshi Marusawa
  • Publication number: 20150002252
    Abstract: A coil component that includes a drum-shaped core with an upper flange and a lower flange, a winding wound around the core, and an exterior resin between the upper flange and lower flange of the core. The exterior resin includes an inorganic filler at 91 to 95 mass % with respect to the exterior resin, and a resin that has more than one glass transition temperature and has a phase-separated structure. A flange spacing distance between the upper flange and the lower flange is 1.0 mm or less.
    Type: Application
    Filed: September 17, 2014
    Publication date: January 1, 2015
    Inventors: Hiroyuki Masaki, Nobuyuki Kinami, Hiroshi Marusawa
  • Patent number: 7466283
    Abstract: A coil antenna structure includes a first magnetic component extending in the thickness direction of a tabular primary casing. A second magnetic component and a third magnetic component, which are magnetically connected to the first magnetic component, are disposed on the first principal surface side and the second principal surface side of the primary casing, respectively. The first magnetic component is provided with a coil component surrounding it. In this manner, a U-shaped magnetic path is provided at an end portion of the primary casing so as to detour around a substrate defining an internal conductor. Likewise, a U-shaped magnetic path including fourth to sixth magnetic components is provided in a secondary casing defining a clamshell type casing together with the primary casing so as to detour around a substrate defining as an internal conductor.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: December 16, 2008
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Gaku Kamitani, Hiroshi Marusawa, Takehiro Konoike, Kazunari Kawahata
  • Patent number: 7341864
    Abstract: A molecule introducing apparatus is provided with a power supply circuit 20 for supplying power, a step-up transformer 30 which is supplied with power from the power supply circuit 20 and which outputs a high voltage, a switching transistor 22 that blocks off and allows the supply of power from the power supply circuit 20 to the step-up transformer 30 and which generates an instantaneous high voltage, and a pair of electrode probes 50 for applying the instantaneous high voltage generated at the step-up transformer 30 to a predetermined region in a body. The molecule introducing apparatus oscillates DNA arranged outside a cell by the instantaneous high voltage so as to introduce the DNA into the cell.
    Type: Grant
    Filed: January 29, 2001
    Date of Patent: March 11, 2008
    Assignees: The Hollenniun Laboratories, Meiryo Technica Corporation, Ltd.
    Inventors: Yoshitaka Sakamoto, Masafumi Koide, Juichiro Nakashima, Susumu Satoh, Sousuke Miyoshi, Akiko Suzuki, Hiroyuki Arakawa, Hiroshi Marusawa
  • Publication number: 20070052600
    Abstract: A coil antenna structure includes a first magnetic component extending in the thickness direction of a tabular primary casing. A second magnetic component and a third magnetic component, which are magnetically connected to the first magnetic component, are disposed on the first principal surface side and the second principal surface side of the primary casing, respectively. The first magnetic component is provided with a coil component surrounding it. In this manner, a U-shaped magnetic path is provided at an end portion of the primary casing so as to detour around a substrate defining an internal conductor. Likewise, a U-shaped magnetic path including fourth to sixth magnetic components is provided in a secondary casing defining a clamshell type casing together with the primary casing so as to detour around a substrate defining as an internal conductor.
    Type: Application
    Filed: October 26, 2006
    Publication date: March 8, 2007
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Gaku KAMITANI, Hiroshi MARUSAWA, Takehiro KONOIKE, Kazunari KAWAHATA
  • Patent number: 6814883
    Abstract: A high frequency magnetic material includes a Y or M type hexagonal ferrite, wherein the hexagonal ferrite is expressed by the composition formula (1-a-b)(Ba1-xSrx)O.aMeO.bFe2O3, where Me is at least one selected from the group consisting of Co, Ni, Cu, Mg, Mn and Zn, 0.205≦a≦0.25, 0.55≦b≦0.595, 0≦x≦1, and 2.2≦b/a<3. A high frequency circuit element includes magnetic layers and internal electrode layers, wherein the high frequency circuit element is a sintered compact and the magnetic layers include the high frequency magnetic material.
    Type: Grant
    Filed: August 27, 2002
    Date of Patent: November 9, 2004
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Hiroshi Marusawa