Patents by Inventor Kenji Endou

Kenji Endou 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: 11003043
    Abstract: An optical modulator is provided with a ridge-shaped optical waveguide formed of a dielectric thin film having electro-optic effect, a buffer layer covering the optical waveguide, a signal electrode formed on the buffer layer so as to be opposed to the optical waveguide through the buffer layer; a ground electrode formed on the buffer layer together with the signal electrode, and a dielectric film having a higher dielectric constant than air and covering at least a part of exposed surfaces of the signal electrode and ground electrode and exposed surfaces of the buffer layer.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: May 11, 2021
    Assignee: TDK CORPORATION
    Inventors: Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi, Takehito Tanaka, Yoshinobu Kubota, Shinji Iwatsuka, Kenji Endou, Hiroki Hara, Toshinori Matsuura, Takashi Kikukawa
  • Patent number: 10989980
    Abstract: An optical modulator is provided with a substrate, first and second optical waveguides each formed of a ridge-shaped electro-optic material film and disposed so as to be mutually adjacent on the substrate, a buffer layer covering upper surfaces of the first and second optical waveguides, first and second signal electrodes provided above the buffer layer so as to be opposed respectively to the first and second optical waveguides, and a dielectric layer covering at least one of a part of an exposed surface of the first signal electrode and a part of an exposed surface of the second signal electrode, and a part of an upper surface of the buffer layer. Differential signals are applied to the first and second signal electrodes.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: April 27, 2021
    Assignees: TDK CORPORATION, FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Shinji Iwatsuka, Kenji Endou, Hiroki Hara, Toshinori Matsuura, Takashi Kikukawa, Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi, Takehito Tanaka, Yoshinobu Kubota
  • Publication number: 20200272020
    Abstract: An optical modulator is provided with a ridge-shaped optical waveguide formed of a dielectric thin film having electro-optic effect, a buffer layer covering the optical waveguide, a signal electrode formed on the buffer layer so as to be opposed to the optical waveguide through the buffer layer; a ground electrode formed on the buffer layer together with the signal electrode, and a dielectric film having a higher dielectric constant than air and covering at least a part of exposed surfaces of the signal electrode and ground electrode and exposed surfaces of the buffer layer.
    Type: Application
    Filed: February 24, 2020
    Publication date: August 27, 2020
    Inventors: Yasuhiro OHMORI, Masaharu DOI, Shintaro TAKEUCHI, Takehito TANAKA, Yoshinobu KUBOTA, Shinji IWATSUKA, Kenji ENDOU, Hiroki HARA, Toshinori MATSUURA, Takashi KIKUKAWA
  • Publication number: 20200271963
    Abstract: An optical modulator is provided with a substrate, first and second optical waveguides each formed of a ridge-shaped electro-optic material film and disposed so as to be mutually adjacent on the substrate, a buffer layer covering upper surfaces of the first and second optical waveguides, first and second signal electrodes provided above the buffer layer so as to be opposed respectively to the first and second optical waveguides, and a dielectric layer covering at least one of a part of an exposed surface of the first signal electrode and a part of an exposed surface of the second signal electrode, and a part of an upper surface of the buffer layer. Differential signals are applied to the first and second signal electrodes.
    Type: Application
    Filed: February 24, 2020
    Publication date: August 27, 2020
    Inventors: Shinji Iwatsuka, Kenji Endou, Hiroki Hara, Toshinori Matsuura, Takashi Kikukawa, Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi, Takehito Tanaka, Yoshinobu Kubota
  • Patent number: 10508025
    Abstract: A MEMS switch includes a first signal line provided in a first beam, a first GND adjacent to the first signal line, a second signal line provided in a second beam, and a second GND adjacent to the second signal line. A contact terminal is fixed to any one of the first signal line and the second signal line and performs connection between the first signal line and the second signal line according to deformation of the first beam.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: December 17, 2019
    Assignee: TDK CORPORATION
    Inventors: Jotaro Akiyama, Kenji Endou, Takashi Aoyagi, Katsunori Osanai, Tohru Inoue
  • Patent number: 10484794
    Abstract: A loudspeaker diaphragm includes resin and hollow glass member particles contained in the resin. Further, a loudspeaker includes the above-described loudspeaker diaphragm, a magnetic circuit, a frame connected to the magnetic circuit, and a voice coil body having one end connected to the loudspeaker diaphragm and the other end disposed inside a magnetic gap in the magnetic circuit.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: November 19, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tetsushi Itano, Seiji Takagi, Kenji Endou, Kazuaki Nishimura, Makoto Kurozawa
  • Publication number: 20190077655
    Abstract: A MEMS switch includes a first signal line provided in a first beam, a first GND adjacent to the first signal line, a second signal line provided in a second beam, and a second GND adjacent to the second signal line. A contact terminal is fixed to any one of the first signal line and the second signal line and performs connection between the first signal line and the second signal line according to deformation of the first beam.
    Type: Application
    Filed: September 2, 2016
    Publication date: March 14, 2019
    Applicant: TDK CORPORATION
    Inventors: Jotaro AKIYAMA, Kenji ENDOU, Takashi AOYAGI, Katsunori OSANAI, Tohru INOUE
  • Publication number: 20180324526
    Abstract: A loudspeaker diaphragm includes resin and hollow glass member particles contained in the resin. Further, a loudspeaker includes the above-described loudspeaker diaphragm, a magnetic circuit, a frame connected to the magnetic circuit, and a voice coil body having one end connected to the loudspeaker diaphragm and the other end disposed inside a magnetic gap in the magnetic circuit.
    Type: Application
    Filed: July 10, 2018
    Publication date: November 8, 2018
    Inventors: TETSUSHI ITANO, SEIJI TAKAGI, KENJI ENDOU, KAZUAKI NISHIMURA, MAKOTO KUROZAWA
  • Patent number: 9385425
    Abstract: The present invention is to provide an antenna device with the isolation among feedpoints being further improved. In order to achieve this goal, the present invention provides an antenna device provided with a substrate having a ground area, and a first conductor, a second conductor and a third conductor. In the antenna, one end of the second conductor is connected to the ground area via a first feedpoint and the other end of the second conductor is connected to the first conductor. A second feedpoint is included serially in the third conductor at any position. Further, at least part of the third conductor is disposed opposite to the first conductor, and both ends of the third conductor are connected to the ground area.
    Type: Grant
    Filed: May 17, 2013
    Date of Patent: July 5, 2016
    Assignee: TDK CORPORATION
    Inventors: Yasuyuki Hara, Kenji Endou, Tetsuya Shibata
  • Patent number: 8681063
    Abstract: An antenna device includes a loop-shaped element radiating a radio wave of at least wavelength ? and having an electrical length of m×?; a first power feeder exciting the loop-shaped element via voltage or current coupling by using a first electrical signal for radiating the radio wave; and a second power feeder exciting the loop-shaped element via a coupling method that is the same type as the first power feeder by using a second electrical signal for radiating a radio wave of wavelength ?/(2×p?1) at a portion that becomes a node of a standing wave that is formed with the first power feeder as an anti-node and that is based on the first electrical signal, here, “m” and “p” are natural numbers.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: March 25, 2014
    Assignee: TDK Corporation
    Inventors: Kenji Endou, Yasuyuki Hara
  • Publication number: 20130335289
    Abstract: The present invention is to provide an antenna device with the isolation among feedpoints being further improved. In order to achieve this goal, the present invention provides an antenna device provided with a substrate having a ground area, and a first conductor, a second conductor and a third conductor. In the antenna, one end of the second conductor is connected to the ground area via a first feedpoint and the other end of the second conductor is connected to the first conductor. A second feedpoint is included serially in the third conductor at any position. Further, at least part of the third conductor is disposed opposite to the first conductor, and both ends of the third conductor are connected to the ground area.
    Type: Application
    Filed: May 17, 2013
    Publication date: December 19, 2013
    Inventors: Yasuyuki HARA, Kenji ENDOU, Tetsuya SHIBATA
  • Patent number: 8416146
    Abstract: An antenna element is formed by providing a radiation electrode on a base member made of a dielectric material. To protect the antenna element from external impact, a void is formed between a housing and the antenna element. This void is filled with a solid member. The relative permittivity of the solid member is equal to or higher than the relative permittivity of the housing, and equal to or lower than the relative permittivity of the base member. The solid member is formed as an elastic member.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: April 9, 2013
    Assignee: TDK Corporation
    Inventor: Kenji Endou
  • Publication number: 20120218157
    Abstract: An antenna device includes a loop-shaped element radiating a radio wave of at least wavelength ? and having an electrical length of m×?; a first power feeder exciting the loop-shaped element via voltage or current coupling by using a first electrical signal for radiating the radio wave; and a second power feeder exciting the loop-shaped element via a coupling method that is the same type as the first power feeder by using a second electrical signal for radiating a radio wave of wavelength ?/(2×p?1) at a portion that becomes a node of a standing wave that is formed with the first power feeder as an anti-node and that is based on the first electrical signal, here, “m” and “p” are natural numbers.
    Type: Application
    Filed: February 22, 2012
    Publication date: August 30, 2012
    Applicant: TDK Corporation
    Inventors: Kenji ENDOU, Yasuyuki Hara
  • Publication number: 20100225560
    Abstract: An antenna element is formed by providing a radiation electrode on a base member made of a dielectric material. To protect the antenna element from external impact, a void is formed between a housing and the antenna element. This void is filled with a solid member. The relative permittivity of the solid member is equal to or higher than the relative permittivity of the housing, and equal to or lower than the relative permittivity of the base member. The solid member is formed as an elastic member.
    Type: Application
    Filed: March 1, 2010
    Publication date: September 9, 2010
    Inventor: Kenji ENDOU
  • Patent number: 7733663
    Abstract: A multilayer ceramic substrate includes a plurality of ceramic layers laminated each other. The plurality of ceramic layers form a bulge and a cavity having such a shape that an opening area of the cavity gradually becomes smaller toward a bottom of the cavity.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: June 8, 2010
    Assignee: TDK Corporation
    Inventors: Kenji Endou, Kiyoshi Hatanaka, Masaharu Hirakawa, Haruo Nishino, Hideaki Fujioka
  • Patent number: 7578058
    Abstract: A multilayer ceramic substrate having a cavity is formed by the steps of laminating a plurality of ceramic green sheets including ceramic green sheets having through holes corresponding to the cavity to form a multilayer body, pressing the multilayer body and firing the pressed body. At this time, a shrinkage suppression green sheet is laminated on the surface of the a ceramic green sheet constituting the outermost layer of the multilayer body, and a shrinkage suppression green sheet piece is disposed on the ceramic green sheet exposed to the bottom of the cavity in accordance with the shape of the cavity. A burnable sheet is further disposed on the shrinkage suppression green sheet piece. Before the pressing step, an embedded green sheet separate from the ceramic green sheets (portion separated by inserting a cut) is disposed on the shrinkage suppression green sheet piece or the burnable sheet so that it is filled in the cavity. After the firing step, the embedded green sheet fired is removed.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: August 25, 2009
    Assignee: TDK Corporation
    Inventors: Kenji Endou, Kiyoshi Hatanaka, Masaharu Hirakawa, Haruo Nishino, Hideaki Fujioka
  • Publication number: 20080283281
    Abstract: A multilayer ceramic substrate includes a plurality of ceramic layers laminated each other. The plurality of ceramic layers form a bulge and a cavity having such a shape that an opening area of the cavity gradually becomes smaller toward a bottom of the cavity.
    Type: Application
    Filed: April 29, 2008
    Publication date: November 20, 2008
    Applicant: TDK CORPORATION
    Inventors: Kenji Endou, Kiyoshi Hatanaka, Masaharu Hirakawa, Haruo Nishino, Hideaki Fujioka
  • Patent number: 7286025
    Abstract: A technique for improving a circulator element for its temperature characteristic is provided. A circulator element including a garnet type ferrite material, and a permanent magnet for applying a direct-current magnetic field to the garnet type ferrite material, wherein S11 represents the saturation magnetization of said garnet type ferrite material at a temperature T1, S12 represents one at a temperature T2, and S13 represents one at a temperature T3; and S21 represents the saturation magnetization of said permanent magnet at a temperature T1, S22 represents one at a temperature T2, and S23 represents one at a temperature T3, where T1<T2<T3, and the saturation magnetizations S11, S12, S13, S21, S22 and S23 are relative values providing that the saturation magnetizations at the temperature T2 is 1, and wherein the relations |(S12?S11)/(T2?T1)|<|(S22?S21)/(T2?T1)| and |(S13?S12)/(T3?T2)|>|(S23?S22)/(T3?T2)| are satisfied.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: October 23, 2007
    Assignee: TDK Corporation
    Inventors: Kenji Endou, Takahide Kurahashi, Sakae Henmi, Hidenori Ohata
  • Publication number: 20070200133
    Abstract: An LED assembly including a wiring substrate with an opening at its center; a heat sink housed inside the opening; an LED chip mounted on the heat sink; a connecting section for electrically coupling the LED chip and wiring substrate; and a transparent resin covering the LED chip and connecting section. Heat generated from the LED chip is efficiently dissipated, and high productivity is also achievable.
    Type: Application
    Filed: March 31, 2006
    Publication date: August 30, 2007
    Inventors: Akira Hashimoto, Masaaki Katsumata, Masaaki Hayama, Kenichi Endou, Kenji Endou, Hitoshi Hirano, Hidenori Katsumura, Tatsuya Inoue
  • Publication number: 20060234023
    Abstract: A multilayer ceramic substrate having a cavity is formed by the steps of laminating a plurality of ceramic green sheets including ceramic green sheets having through holes corresponding to the cavity to form a multilayer body, pressing the multilayer body and firing the pressed body. At this time, a shrinkage suppression green sheet is laminated on the surface of the a ceramic green sheet constituting the outermost layer of the multilayer body, and a shrinkage suppression green sheet piece is disposed on the ceramic green sheet exposed to the bottom of the cavity in accordance with the shape of the cavity. A burnable sheet is further disposed on the shrinkage suppression green sheet piece. Before the pressing step, an embedded green sheet separate from the ceramic green sheets (portion separated by inserting a cut) is disposed on the shrinkage suppression green sheet piece or the burnable sheet so that it is filled in the cavity. After the firing step, the embedded green sheet fired is removed.
    Type: Application
    Filed: April 18, 2006
    Publication date: October 19, 2006
    Applicant: TDK CORPORATION
    Inventors: Kenji Endou, Kiyoshi Hatanaka, Masaharu Hirakawa, Haruo Nishino, Hideaki Fujioka