Patents by Inventor Naoharu Yamamoto

Naoharu Yamamoto 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).

  • Patent number: 10943725
    Abstract: A laminated substrate embedded type inductor includes a laminated resin substrate in which a pair of first resin substrates are laminated, a sheet-shaped magnetic core placed in the laminated resin substrate, via holes provided so as to pass through the laminated resin substrate, and a coil formed via the via holes. The laminated resin substrate contains an adhesive component, wherein the sheet-shaped magnetic core is a molded body obtained by forming a soft magnetic flat metal powder into a flat plate, the soft magnetic flat metal powder is oriented in a plane of the flat plate, and a generated magnetic flux of the coil circulates in the plane of the flat plate, and wherein the magnetic core is integrated with the laminated resin substrate so that the adhesive component is impregnated in pores of the magnetic core.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: March 9, 2021
    Assignee: TOKIN CORPORATION
    Inventors: Kenichi Chatani, Naoharu Yamamoto, Shigeyoshi Yoshida
  • Publication number: 20190043654
    Abstract: A laminated substrate embedded type inductor includes a laminated resin substrate in which a pair of first resin substrates are laminated, a sheet-shaped magnetic core placed in the laminated resin substrate, via holes provided so as to pass through the laminated resin substrate, and a coil formed via the via holes. The laminated resin substrate contains an adhesive component, wherein the sheet-shaped magnetic core is a molded body obtained by forming a soft magnetic flat metal powder into a flat plate, the soft magnetic flat metal powder is oriented in a plane of the flat plate, and a generated magnetic flux of the coil circulates in the plane of the flat plate, and wherein the magnetic core is integrated with the laminated resin substrate so that the adhesive component is impregnated in pores of the magnetic core.
    Type: Application
    Filed: September 14, 2018
    Publication date: February 7, 2019
    Applicant: TOKIN CORPORATION
    Inventors: Kenichi CHATANI, Naoharu YAMAMOTO, Shigeyoshi YOSHIDA
  • Patent number: 9716317
    Abstract: An antenna device, which has wide-angle directivity and a configuration suitable to be used in a portable electronic apparatus, includes a flat board-like substantially rectangular soft magnetic body, and a loop-shaped coil disposed from a front surface to a rear surface of the soft magnetic body such that a region surrounded by the coil includes at least a part of a specific edge, i.e., one edge out of four edges of the soft magnetic body, and does not include a facing edge that faces the specific edge.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: July 25, 2017
    Assignee: NEC TOKIN CORPORATION
    Inventors: Kenichi Chatani, Naoharu Yamamoto, Toshiaki Oka, Takashi Otsuki
  • Patent number: 9219299
    Abstract: A resonator is connected to a first plane which is one of a power plane and a ground plane, wherein the power plane and the ground plane are apart from each other in an up-down direction. The resonator comprises a connecting portion and a body portion. The connecting portion is connected to the first plane. The connecting portion extends in the up-down direction beyond a second plane, which is a remaining one of the power plane and the ground plane, while not being in electrical contact with the second plane. The body portion is connected to the connecting portion while not being in contact with the second plane. The body portion is arranged so that the second plane is located between the body portion and the first plane in the up-down direction.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: December 22, 2015
    Assignees: NEC TOKIN CORPORATION, NATIONAL UNIVERSITY CORPORATION OKAYAMA UNIVERSITY
    Inventors: Koichi Kondo, Naoharu Yamamoto, Yoshitaka Toyota, Kengo Iokibe, Farhan Zaheed Mahmood
  • Publication number: 20150303363
    Abstract: An object of the present invention is to provide a thermoelectric conversion element that can demonstrate satisfactory thermoelectric conversion performance, and also has flexibility or can be mounted on a surface having irregularities or a curved surface, a method of manufacturing such a thermoelectric conversion element, and a method of using such a thermoelectric conversion element. A thermoelectric conversion element according to the present invention includes a columnar crystal ferrite layer and an electromotive film formed on the columnar crystal ferrite layer. The electromotive film is configured to generate an electromotive force in an in-plane direction by an inverse spin Hall effect. Columnar crystal grains of the columnar crystal ferrite layer include a major axis a of not less than 200 nm and a minor axis b of not more than 500 nm where a>b.
    Type: Application
    Filed: October 11, 2013
    Publication date: October 22, 2015
    Applicants: NEC CORPORATION, NEC TOKIN CORPORATION
    Inventors: Akihiro KIRIHARA, Masahiko ISHIDA, Shigeru KOUMOTO, Koichi KONDO, Naoharu YAMAMOTO
  • Publication number: 20150235753
    Abstract: A sheet-shaped inductor includes a magnetic core and a coil. First and second via holes respectively pass through, in a lamination direction, two surfaces facing each other of the magnetic core. The coil includes first and second via conductors having end portions respectively protruding to the outside from the first and second via holes, and first and second surface conductors joined to both ends of the first and second via conductors via plug portions. The magnetic core is composed of a sheet obtained by molding a mixture containing a soft magnetic flat metal powder and a binder so that the soft magnetic flat metal powder is oriented in a flat plane formed by the inductor, or is composed of a plurality of such sheets laminated and pressed in a lamination direction. A laminated substrate embedded type inductor is configured so that a magnetic core is embedded in a laminated substrate.
    Type: Application
    Filed: September 10, 2013
    Publication date: August 20, 2015
    Applicant: NEC TOKIN CORPORATION
    Inventors: Kenichi Chatani, Naoharu Yamamoto, Shigeyoshi Yoshida
  • Patent number: 8896407
    Abstract: An inductor comprises a magnetic core and a coil. The magnetic core has a wound portion around which the coil is wound, and a peripheral portion. The magnetic core is formed from two or more preliminarily-formed-bodies which are pressure-molded in a state where the coil winds one or more preliminarily-formed-bodies which form the wound portion. The preliminarily-formed-bodies include at least one preliminarily-formed-body which forms the peripheral portion while not form the wound portion. Each of the preliminarily-formed-bodies is made of a mixture of flat magnetic powders and an organic binder so as to have a plate-like shape. The flat magnetic powders are oriented so as to be parallel to the preliminarily-formed-body.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: November 25, 2014
    Assignee: NEC TOKIN Corporation
    Inventors: Kenichi Chatani, Naoharu Yamamoto
  • Publication number: 20140055208
    Abstract: A resonator is connected to a first plane which is one of a power plane and a ground plane, wherein the power plane and the ground plane are apart from each other in an up-down direction. The resonator comprises a connecting portion and a body portion. The connecting portion is connected to the first plane. The connecting portion extends in the up-down direction beyond a second plane, which is a remaining one of the power plane and the ground plane, while not being in electrical contact with the second plane. The body portion is connected to the connecting portion while not being in contact with the second plane. The body portion is arranged so that the second plane is located between the body portion and the first plane in the up-down direction.
    Type: Application
    Filed: August 21, 2013
    Publication date: February 27, 2014
    Applicants: NATIONAL UNIVERSITY CORPORATION OKAYAMA UNIVERSITY, NEC TOKIN CORPORATION
    Inventors: Koichi KONDO, Naoharu YAMAMOTO, Yoshitaka TOYOTA, Kengo IOKIBE, Farhan Zaheed MAHMOOD
  • Publication number: 20140035790
    Abstract: An antenna device, which has wide-angle directivity and a configuration suitable to be used in a portable electronic apparatus, includes a flat board-like substantially rectangular soft magnetic body, and a loop-shaped coil disposed from a front surface to a rear surface of the soft magnetic body such that a region surrounded by the coil includes at least a part of a specific edge, i.e., one edge out of four edges of the soft magnetic body, and does not include a facing edge that faces the specific edge.
    Type: Application
    Filed: April 22, 2011
    Publication date: February 6, 2014
    Applicant: NEC TOKIN CORPORATION
    Inventors: Kenichi Chatani, Naoharu Yamamoto, Toshiaki Oka, Takashi Otsuki
  • Patent number: 7167140
    Abstract: A coil antenna having a magnetic core and a wire wound around the magnetic core. The magnetic core is flexible and bendable and is made of a mixture including soft magnetic powder and an organic binder agent. The soft magnetic powder comprises a plurality of particles, each of which is coated with an insulator layer which is made of an oxide layer.
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: January 23, 2007
    Assignee: NEC Tokin Corporation
    Inventors: Yoshihiko Kato, Naoharu Yamamoto, Makoto Teshima
  • Patent number: 7030828
    Abstract: A coil antenna is disclosed comprising a magnetic core and a wire wound around the magnetic core. The magnetic core is made of a mixture comprising soft magnetic powder and an organic binder agent. The magnetic core has a specific complex permeability whose real part ?? is 20 or more over a frequency range of 10 MHz or less and whose imaginary part ?? is 10 or more over a frequency range of 10 MHz or more so that the magnetic core is also servable as a noise suppressor against high-frequency noise.
    Type: Grant
    Filed: October 6, 2004
    Date of Patent: April 18, 2006
    Assignee: NEC TOKIN Corporation
    Inventors: Yoshihiko Kato, Naoharu Yamamoto, Makoto Teshima, Mitsuharu Sato
  • Publication number: 20050237254
    Abstract: A coil antenna is disclosed comprising a magnetic core and a wire wound around the magnetic core. The magnetic core is made of a mixture comprising soft magnetic powder and an organic binder agent. The magnetic core has a specific complex permeability whose real part ?? is 20 or more over a frequency range of 10 MHz or less and whose imaginary part ?? is 10 or more over a frequency range of 10 MHz or more so that the magnetic core is also servable as a noise suppressor against high-frequency noise.
    Type: Application
    Filed: October 6, 2004
    Publication date: October 27, 2005
    Applicant: NEC TOKIN Corporation
    Inventors: Yoshihiko Kato, Naoharu Yamamoto, Makoto Teshima, Mitsuharu Sato
  • Publication number: 20050024285
    Abstract: A coil antenna is disclosed comprising a magnetic core and a wire wound around the magnetic core. The magnetic core is flexible and bendable and is made of a mixture comprising soft magnetic powder and an organic binder agent. The soft magnetic powder comprises a plurality of particles each of which is coated with an insulator layer.
    Type: Application
    Filed: July 1, 2004
    Publication date: February 3, 2005
    Applicant: NEC TOKIN Corporation
    Inventors: Yoshihiko Kato, Naoharu Yamamoto, Makoto Teshima
  • Patent number: 5326945
    Abstract: To detect an impact due to a shock with high precision and stability, a shock sensor is employed which provides a sufficiently long closure interval of a contact of a reed switch (1) enough to carry out signal processing. A gap between an outer surface of a magnet (2) and an inner wall (8) of a housing (7) defining a passage for the magnet (2) comprises a first gap (G1) between a stationary position and an activating position and a second gap (G2) between the activating position and a stop position. The inner wall (8) is formed so that the first gap (G1) is greater than the second gap (G2). The velocity of the magnet (2) is lower when travelling in the second gap (G2) than the velocity in the first gap (G1) because air resistance is greater in the second gap (G2). Accordingly, the closure interval is increased.
    Type: Grant
    Filed: December 2, 1992
    Date of Patent: July 5, 1994
    Assignees: Tokin Corporation, Sensor Technology Co. Ltd.
    Inventors: Noriyuki Gotoh, Yasunori Ohtuki, Naoharu Yamamoto, Hiroyuki Sada, Akihiko Kuroiwa, Hiroshi Moriyama
  • Patent number: 5137446
    Abstract: An orthodontic teeth alignment correction wire element made of an alloy represented by the chemical formula of Ti.sub.a Ni.sub.b-c C.sub.c, wherein a+b=100, b=50-52, c=0.25-5.0, or an alloy represented by the chemical formula of Ti.sub.a Ni.sub.b-c-d C.sub.c X.sub.d, wherein X is at least one element selected from V, Cr, Fe, Nb, Ta, W, and Al, wherein a+b=100, b=50-52, c=0.25-5.0, d=0.25-2.0, and exhibits pseudoelasticity at the natural human body temperature. The wire has different recovery forces at different sections therealong by heat treating those sections at controlled temperatures of 400.degree.-600.degree. C. and for controlled time periods of 10-150 minutes and thereafter reheat treating them. An orthodontic coil is made of each of the above-described alloy wires for correction of mismatch of the upper and the lower jaws.
    Type: Grant
    Filed: June 7, 1991
    Date of Patent: August 11, 1992
    Assignee: Tokin Corporation and Tomy, Inc.
    Inventors: Kiyoshi Yamauchi, Naoharu Yamamoto