Patents by Inventor Daisuke Matsushita

Daisuke Matsushita 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: 9040949
    Abstract: According to one embodiment, an information recording device includes first and second electrodes, a variable resistance layer between the first and second electrodes, and a control circuit which controls the variable resistance layer to n (n is a natural number except 1) kinds of resistance. The variable resistance layer comprises a material filled between the first and second electrodes, and particles arranged in a first direction from the first electrode to the second electrode in the material, and each of the particles has a resistance lower than that of the material. A resistance of the variable resistance layer is decided by a short between the first electrode and at least one of the particles.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: May 26, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuichiro Mitani, Daisuke Matsushita, Shosuke Fujii
  • Publication number: 20150140869
    Abstract: An electric connector to be mounted on a printed circuit board, includes a housing having an inner space into which a second electric connector is inserted in a direction in which a plane of the printed circuit board is extensive, and at least one fixer through which the housing is fixed on the printed circuit board, the fixer including an extending portion extending from a floor portion of the housing towards outside of the housing, and making contact at a lower surface thereof with a surface of the printed circuit board, the extending portion being fixed at a lower surface thereof on the surface of the printed circuit board to cause the electric connector to be fixed on the surface of the printed circuit board.
    Type: Application
    Filed: November 13, 2014
    Publication date: May 21, 2015
    Inventors: Jun Mukunoki, Daisuke Matsushita
  • Publication number: 20150131363
    Abstract: According to one embodiment, a nonvolatile semiconductor memory device includes a memory cell array and a control circuit. The memory cell array include the memory cells each including a variable resistance element in which a reset current flowing in a reset operation is smaller than a set current flowing in a set operation by not less than one order of magnitude. The control circuit performs the reset operation and the set operation for the memory cells. The control circuit performs the reset operation for all memory cells being in the low resistance state and connected to selected first interconnections and selected second interconnections.
    Type: Application
    Filed: January 22, 2015
    Publication date: May 14, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira TAKASHIMA, Hidenori MIYAGAWA, Shosuke FUJII, Daisuke MATSUSHITA
  • Patent number: 9022816
    Abstract: A connector terminal includes a pair of terminal contacts sandwiching a male connector therebetween to make electric contact with the male connector, and a terminal body supporting the pair of terminal contacts. The terminal contacts are formed by bending a metal plate having been punched into a designed shape. The terminal contacts each include a contact surface formed by bending a contact part not facing the other contact part and extending towards a central axis of the terminal body.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: May 5, 2015
    Assignee: Dai-Ichi Seiko Co., Ltd.
    Inventors: Takayoshi Endo, Daisuke Matsushita
  • Publication number: 20150102279
    Abstract: According to one embodiment, a resistance change device includes a first electrode including a metal, a second electrode, and an amorphous oxide layer including Si and O between the first and second electrode, the layer having a concentration gradient of O and a first peak thereof in a direction from the first electrode to the second electrode.
    Type: Application
    Filed: November 21, 2014
    Publication date: April 16, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shosuke FUJII, Daisuke MATSUSHITA, Yuichiro MITANI
  • Publication number: 20150084113
    Abstract: It is made possible to provide a method for manufacturing a semiconductor device that has a high-quality insulating film in which defects are not easily formed, and experiences less leakage current. A method for manufacturing a semiconductor device, includes: forming an amorphous silicon layer on an insulating layer; introducing oxygen into the amorphous silicon layer; and forming a silicon oxynitride layer by nitriding the amorphous silicon layer having oxygen introduced thereinto.
    Type: Application
    Filed: September 11, 2014
    Publication date: March 26, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Daisuke Matsushita, Yuuichiro Mitani
  • Patent number: 8971106
    Abstract: According to one embodiment, a nonvolatile semiconductor memory device includes a memory cell array and a control circuit. The memory cell array include the memory cells each including a variable resistance element in which a reset current flowing in a reset operation is smaller than a set current flowing in a set operation by not less than one order of magnitude. The control circuit performs the reset operation and the set operation for the memory cells. The control circuit performs the reset operation for all memory cells being in the low resistance state and connected to selected first interconnections and selected second interconnections.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: March 3, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Takashima, Hidenori Miyagawa, Shosuke Fujii, Daisuke Matsushita
  • Publication number: 20140376303
    Abstract: According to one embodiment, a nonvolatile semiconductor memory device includes a memory cell array and a control circuit. The memory cell array include the memory cells each including a variable resistance element in which a reset current flowing in a reset operation is smaller than a set current flowing in a set operation by not less than one order of magnitude. The control circuit performs the reset operation and the set operation for the memory cells. The control circuit performs the reset operation for all memory cells being in the low resistance state and connected to selected first interconnections and selected second interconnections.
    Type: Application
    Filed: September 8, 2014
    Publication date: December 25, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira TAKASHIMA, Hidenori Miyagawa, Shosuke Fujii, Daisuke Matsushita
  • Patent number: 8916848
    Abstract: According to one embodiment, a resistance change device includes a first electrode including a metal, a second electrode, and an amorphous oxide layer including Si and O between the first and second electrode, the layer having a concentration gradient of O and a first peak thereof in a direction from the first electrode to the second electrode.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: December 23, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shosuke Fujii, Daisuke Matsushita, Yuichiro Mitani
  • Publication number: 20140346434
    Abstract: According to one embodiment, a nonvolatile variable resistance element includes a first electrode, a second electrode, a variable resistance layer, and a dielectric layer. The second electrode includes a metal element. The variable resistance layer is arranged between the first electrode and the second electrode. A resistance change is reversibly possible in the variable resistance layer according to move the metal element in and out. The dielectric layer is inserted between the second electrode and the variable resistance layer and has a diffusion coefficient of the metal element smaller than that of the variable resistance layer.
    Type: Application
    Filed: August 13, 2014
    Publication date: November 27, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hidenori MIYAGAWA, Shosuke FUJII, Akira TAKASHIMA, Daisuke MATSUSHITA
  • Patent number: 8876561
    Abstract: An electrical connector includes a connector housing having a slot into which a circuit board is to be inserted, and a plurality of connector terminals to be inserted into the connector housing. The connector housing includes terminal spaces into which the connector terminals are inserted, and partition walls partitioning the terminal spaces from each other. The connector terminals each include a sheath to be inserted into one of the terminal spaces, and a resilient contact making electrical contact with the circuit board. The electrical connector includes a convex portion and a concave portion for preventing the terminal spaces and the circuit board from falling apart from each other. The convex portions can be formed on opposite sidewalls of the sheath, and the concave portions can be formed at the partition walls.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: November 4, 2014
    Assignee: Dai-Ichi Seiko Co., Ltd.
    Inventors: Takayoshi Endo, Daisuke Matsushita
  • Patent number: 8860118
    Abstract: It is made possible to provide a method for manufacturing a semiconductor device that has a high-quality insulating film in which defects are not easily formed, and experiences less leakage current. A method for manufacturing a semiconductor device, includes: forming an amorphous silicon layer on an insulating layer; introducing oxygen into the amorphous silicon layer; and forming a silicon oxynitride layer by nitriding the amorphous silicon layer having oxygen introduced thereinto.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: October 14, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Daisuke Matsushita, Yuuichiro Mitani
  • Patent number: 8854874
    Abstract: According to one embodiment, a nonvolatile semiconductor memory device includes a memory cell array and a control circuit. The memory cell array include the memory cells each including a variable resistance element in which a reset current flowing in a reset operation is smaller than a set current flowing in a set operation by not less than one order of magnitude. The control circuit performs the reset operation and the set operation for the memory cells. The control circuit performs the reset operation for all memory cells being in the low resistance state and connected to selected first interconnections and selected second interconnections.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: October 7, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Takashima, Hidenori Miyagawa, Shosuke Fujii, Daisuke Matsushita
  • Patent number: 8835896
    Abstract: According to one embodiment, a nonvolatile variable resistance element includes a first electrode, a second electrode, a variable resistance layer, and a dielectric layer. The second electrode includes a metal element. The variable resistance layer is arranged between the first electrode and the second electrode. A resistance change is reversibly possible in the variable resistance layer according to move the metal element in and out. The dielectric layer is inserted between the second electrode and the variable resistance layer and has a diffusion coefficient of the metal element smaller than that of the variable resistance layer.
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: September 16, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hidenori Miyagawa, Shosuke Fujii, Akira Takashima, Daisuke Matsushita
  • Publication number: 20140239373
    Abstract: According to one embodiment, a semiconductor memory device includes a semiconductor member, a first insulating layer provided on the semiconductor member, a TaN layer provided on the first insulating layer and containing tantalum and nitrogen, a TaSiN layer provided on the TaN layer in contact with the TaN layer and containing tantalum, silicon, and nitrogen, a second insulating layer provided on the TaSiN layer in contact with the TaSiN layer and containing oxygen, and a control electrode provided on the second insulating layer.
    Type: Application
    Filed: July 11, 2013
    Publication date: August 28, 2014
    Inventors: Atsushi MURAKOSHI, Daisuke Matsushita
  • Patent number: 8779498
    Abstract: According to one embodiment, a nonvolatile semiconductor memory device includes a semiconductor substrate, a first gate insulating film, a charge storage layer, a second gate insulating film, and a control gate electrode. The first gate insulating film is arranged on the semiconductor substrate. The charge storage layer is arranged on the first gate insulating film, and includes aluminum and silicon. The second gate insulating film is arranged on the charge storage layer, and includes aluminum, silicon, and lanthanum. The control gate electrode is arranged on the second gate insulating film.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: July 15, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Takashima, Daisuke Matsushita
  • Patent number: 8779503
    Abstract: According to one embodiment, a nonvolatile semiconductor memory includes a semiconductor layer, a first insulating layer on the semiconductor layer, a charge storage layer on the first insulating layer, a second insulating layer on the charge storage layer, and a control gate electrode on the second insulating layer. The second insulating layer comprises a stacked structure provided in order of a first lanthanum aluminate layer, a lanthanum aluminum silicate layer and a second lanthanum aluminate layer from the charge storage layer side to the control gate electrode side.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: July 15, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Daisuke Matsushita, Akira Takashima
  • Patent number: 8772751
    Abstract: According to one embodiment, a memory device includes a first electrode including a crystallized SixGe1-x layer (0?x<1), a second electrode including a metal element, a variable resistance part between the first and second electrode, the part including an amorphous Si layer, and a control circuit controlling a filament in the amorphous Si layer, the filament including the metal element.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: July 8, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Takashima, Daisuke Matsushita, Takashi Yamauchi, Yuuichi Kamimuta, Hidenori Miyagawa
  • Publication number: 20140167133
    Abstract: A nonvolatile semiconductor memory according to an embodiment includes: a semiconductor region; a first insulating film formed on the semiconductor region; a charge storage film formed on the first insulating film; a hydrogen diffusion preventing film formed on the charge storage film; a second insulating film formed on the hydrogen diffusion preventing film; a control gate electrode formed on the second insulating film; a hydrogen discharge film formed on the control gate electrode; and a sidewall formed on a side surface of a multilayer structure including the first insulating film, the charge storage film, the hydrogen diffusion preventing film, the second insulating film, and the control gate electrode, the sidewall containing a material for preventing hydrogen from diffusing.
    Type: Application
    Filed: December 17, 2013
    Publication date: June 19, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Izumi HIRANO, Yuichiro Mitani, Masayasu Miyata, Yasushi Nakasaki, Koichi Kato, Daisuke Matsushita, Akira Takashima, Misako Morota
  • Patent number: 8742489
    Abstract: According to one embodiment, a nonvolatile semiconductor memory including a first gate insulating film formed on a channel region of a semiconductor substrate, a first particle layer formed in the first gate insulating film, a charge storage part formed on the first gate insulating film, a second gate insulating film which is formed on the charge storage part, a second particle layer formed in the second gate insulating film, and a gate electrode formed on the second gate insulating film. The first particle layer includes first conductive particles that satisfy Coulomb blockade conditions. The second particle layer includes second conductive particles that satisfy Coulomb blockade conditions and differs from the first conductive particles in average particle diameter.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: June 3, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Ryuji Ohba, Daisuke Matsushita