Patents by Inventor Iwao Ohwada

Iwao Ohwada 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: 20200363037
    Abstract: An optic converts wavelength of light from a light source. The optic includes a first substrate and a second substrate. The first substrate includes a fluorescent material substrate. The second substrate supports the first substrate. The second substrate includes a translucent substrate to receive the light from the light source through the first substrate. The translucent substrate has an oriented polycrystalline structure to have a crystalline anisotropy in refractive index.
    Type: Application
    Filed: August 3, 2020
    Publication date: November 19, 2020
    Inventors: Iwao Ohwada, Jungo Kondo, Yoshimasa Kobayashi
  • Patent number: 10581114
    Abstract: Provided is a battery-equipped device including a substrate, a device disposed on the substrate, an all-solid-state battery disposed such that the planar shape conforms to the periphery of the device on the substrate and at least partially having a complementary outer edge shape that conforms to the entire or a part of the outer edge shape of the device, and interconnections connecting the device and the all-solid-state battery. The all-solid-state battery includes a positive electrode layer containing an oriented polycrystalline positive-electrode active material composed of lithium transition metal oxide particles oriented in a certain direction, a solid electrolyte layer composed of a lithium-ion conductive material, and a negative electrode layer containing a negative-electrode active material. The present invention can provide a battery-equipped device that can significantly increase the degree of freedom of design and can output necessary electric power in a minimum space.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: March 3, 2020
    Assignee: NGK Insulators, Ltd.
    Inventors: Iwao Ohwada, Toshihiro Yoshida, Kenshin Kitoh
  • Publication number: 20190270676
    Abstract: In a first step of a method for producing a transparent AlN sintered body, first, a formed body is prepared by forming a mixture obtained by mixing a sintering aid with an AlN raw-material powder containing a plate-like AlN powder whose plate surface is a c-plane and which has an aspect ratio of 3 or more. At this time, the mixture is formed such that the plate surface of the plate-like AlN powder is disposed along a surface of the formed body. In a second step, an oriented AlN sintered body is obtained by subjecting the formed body to hot-press sintering in a non-oxidizing atmosphere while applying a pressure to the surface of the formed body. In a third step, a transparent AlN sintered body is obtained by sintering the oriented AlN sintered body at normal pressure in a non-oxidizing atmosphere to remove a component derived from the sintering aid.
    Type: Application
    Filed: May 22, 2019
    Publication date: September 5, 2019
    Applicant: NGK INSULATORS, LTD.
    Inventors: Yoshimasa KOBAYASHI, Hiroharu Kobayashi, Kazuki IIDA, Iwao Ohwada
  • Publication number: 20190252682
    Abstract: The present invention provides a secondary battery, including a positive electrode plate composed of an inorganic material including a positive electrode active material in an oxide form and having a thickness of 25 ?m or more; a negative electrode plate composed of an inorganic material including a negative electrode active material in an oxide form and having a thickness of 25 ?m or more; and an inorganic solid electrolyte layer, wherein the secondary battery is chargeable and dischargeable at a temperature of 100° C. or more. The present invention can provide rapid charge/discharge at a high cycle capacity retention and increase the capacity of the secondary battery.
    Type: Application
    Filed: April 23, 2019
    Publication date: August 15, 2019
    Applicant: NGK INSULATORS, LTD.
    Inventors: Yukihisa TAKEUCHI, Iwao Ohwada, Yukinobu Yura
  • Publication number: 20190120442
    Abstract: A phosphor device includes a phosphor layer composed of a phosphor glass or phosphor single crystal, a reflective film provided on the phosphor layer, a warping suppression layer provided on the reflective film, and a supporting body bonded to the warping suppression layer by direct bonding. Excitation light incident into the phosphor layer is converted to fluorescence, and the fluorescence and excitation light are reflected by the reflective film and emitted from the phosphor layer.
    Type: Application
    Filed: December 12, 2018
    Publication date: April 25, 2019
    Inventors: Naotake OKADA, Iwao OHWADA, Shoichiro YAMAGUCHI, Keiichiro ASAI, Jungo KONDO
  • Publication number: 20170229733
    Abstract: Provided is a battery-equipped device including a substrate, a device disposed on the substrate, an all-solid-state battery disposed such that the planar shape conforms to the periphery of the device on the substrate and at least partially having a complementary outer edge shape that conforms to the entire or a part of the outer edge shape of the device, and interconnections connecting the device and the all-solid-state battery. The all-solid-state battery includes a positive electrode layer containing an oriented polycrystalline positive-electrode active material composed of lithium transition metal oxide particles oriented in a certain direction, a solid electrolyte layer composed of a lithium-ion conductive material, and a negative electrode layer containing a negative-electrode active material. The present invention can provide a battery-equipped device that can significantly increase the degree of freedom of design and can output necessary electric power in a minimum space.
    Type: Application
    Filed: April 26, 2017
    Publication date: August 10, 2017
    Applicant: NGK INSULATORS, LTD.
    Inventors: Iwao OHWADA, Toshihiro YOSHIDA, Kenshin KITOH
  • Patent number: 9685680
    Abstract: Disclosed is use of an all-solid-state battery as a backup power source in at least one device selected from the group consisting of a computer, a laptop computer, a portable computer, a pocket computer, a workstation, a supercomputer, computer-peripheral hardware, and a server. This all-solid-state battery comprises a positive electrode layer comprising a positive-electrode active material that is an oriented polycrystalline body composed of lithium transition metal oxide grains oriented in a given direction; a solid electrolyte layer composed of a lithium-ion conductive material; and a negative electrode layer comprising a negative-electrode active material.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: June 20, 2017
    Assignee: NGK Insulators, Ltd.
    Inventors: Kazuyuki Mizuno, Toshihiro Yoshida, Kenshin Kitoh, Iwao Ohwada
  • Publication number: 20160268639
    Abstract: Disclosed is use of an all-solid-state battery as a backup power source in at least one device selected from the group consisting of a computer, a laptop computer, a portable computer, a pocket computer, a workstation, a supercomputer, computer-peripheral hardware, and a server. This all-solid-state battery comprises a positive electrode layer comprising a positive-electrode active material that is an oriented polycrystalline body composed of lithium transition metal oxide grains oriented in a given direction; a solid electrolyte layer composed of a lithium-ion conductive material; and a negative electrode layer comprising a negative-electrode active material.
    Type: Application
    Filed: May 18, 2016
    Publication date: September 15, 2016
    Applicant: NGK INSULATORS, LTD.
    Inventors: Kazuyuki MIZUNO, Toshihiro YOSHIDA, Kenshin KITOH, Iwao OHWADA
  • Patent number: 9431067
    Abstract: The present invention provides a volatile memory backup system including an all-solid-state battery. The backup system includes a volatile memory, a nonvolatile memory connected to the volatile memory so as to transfer data therebetween, an all-solid-state battery connected to the volatile memory and the nonvolatile memory, the battery continuously or intermittently supplying a current to the volatile memory during a power failure to retain data in the volatile memory, and a controller connected in parallel with the battery, the controller intermittently supplying a peak current to the volatile memory during the power failure and intermittently transferring divided volumes of data in the volatile memory to the nonvolatile memory by the peak current and a current from the battery temporarily increased in association with the peak current to store the data in the nonvolatile memory, thereby gradually accumulating the data in the volatile memory into the nonvolatile memory.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: August 30, 2016
    Assignee: NGK Insulators, Ltd.
    Inventors: Iwao Ohwada, Kenshin Kitoh
  • Publication number: 20160071552
    Abstract: The present invention provides a volatile memory backup system including an all-solid-state battery. The backup system includes a volatile memory, a nonvolatile memory connected to the volatile memory so as to transfer data therebetween, an all-solid-state battery connected to the volatile memory and the nonvolatile memory, the battery continuously or intermittently supplying a current to the volatile memory during a power failure to retain data in the volatile memory, and a controller connected in parallel with the battery, the controller intermittently supplying a peak current to the volatile memory during the power failure and intermittently transferring divided volumes of data in the volatile memory to the nonvolatile memory by the peak current and a current from the battery temporarily increased in association with the peak current to store the data in the nonvolatile memory, thereby gradually accumulating the data in the volatile memory into the nonvolatile memory.
    Type: Application
    Filed: October 23, 2015
    Publication date: March 10, 2016
    Inventors: Iwao OHWADA, Kenshin KITOH
  • Patent number: 7719201
    Abstract: A microdevice has an electron emitter including a memory for accumulating electric charges corresponding to an input voltage, for emitting electrons corresponding to the electric charges accumulated in said memory; and an amplifier connected to a power supply and including a collector electrode for capturing the electrons emitted from the electron emitter. The atmosphere between at least the electron emitter and the collector electrode is a vacuum. When the electrons emitted from the electron emitter are captured by the collector electrode of the amplifier, a collector current flows between the collector electrode and the electron emitter to amplify the input voltage.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: May 18, 2010
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada
  • Patent number: 7713366
    Abstract: A piezoelectric/electrostrictive film is formed on a solid-phase support, the piezoelectric/electrostrictive film including an incompletely bonded region which is incompletely bonded in a predetermined pattern to the solid-phase support, and a bonded region which is bonded to the surface of the solid-phase support so that the incompletely bonded region can be separated. The piezoelectric/electrostrictive film is bonded to a substrate and is separated from the solid-phase support in the bonded region. As a result, the incompletely bonded region is transferred to the substrate. The transferred incompletely bonded region is used as a piezoelectric/electrostrictive film for manufacturing a piezoelectric/electrostrictive film device.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: May 11, 2010
    Assignee: NGK Insulators, Ltd.
    Inventors: Iwao Ohwada, Nobuyuki Kobayashi
  • Patent number: 7651655
    Abstract: A method of producing a dielectric layer made of a polycrystalline dielectric material having anisotropy in the coefficient of thermal expansion is provided, including the steps of providing a raw material powder, and heat treating the raw material powder at least to a temperature sufficient to cause a phase change from a first crystal orientation at room temperature to a different crystal orientation to provide an aggregate of oriented raw material particles having the same chemical composition as the raw material powder but having the different crystal orientation. The method also includes a step of forming a compact from the aggregate of oriented raw material particles, including a step of applying a shearing force to the aggregate and firing the compact to form the dielectric layer.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: January 26, 2010
    Assignee: NGK Insulators, Ltd.
    Inventors: Takaaki Koizumi, Hirofumi Yamaguchi, Iwao Ohwada, Tsutomu Nanataki
  • Patent number: 7635944
    Abstract: An electron-emitting device includes an emitter section composed of a dielectric material, a lower electrode disposed on the lower side of the emitter section, and an upper electrode disposed on the upper side of the emitter section so as to be opposed to the lower electrode with the emitter section therebetween, electrons being emitted from the emitter section through the upper electrode by the application of a drive voltage between the lower electrode and the upper electrode, wherein the upper electrode is provided with a plurality of through-holes which expose the emitter section and which have an average diameter of 10 nm or more and less than 100 nm, and a peripheral portion of each through-hole facing the emitter section is separated at a predetermined distance from the emitter section.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: December 22, 2009
    Assignee: NGK Insulators, Ltd.
    Inventors: Iwao Ohwada, Masao Takahashi, Takayoshi Akao, Shuichi Ozawa, Kei Kosaka
  • Patent number: 7528539
    Abstract: An electron emitter includes an emitter layer formed of a dielectric material, an upper electrode, and a lower electrode. A drive voltage is applied between the upper electrode and the lower electrode, for emitting electrons. The upper electrode is formed of scale-like conductive particles on the upper surface of the emitter layer and has a plurality of opening portions. The surfaces of overhanging portions of the opening portions that face the emitter layer are apart from the emitter layer. The overhanging portions each have such a cross-sectional shape as to be acutely pointed toward the inner edge of the opening portion, or the tip end of the overhanging portion, so that lines of electric force concentrate at the inner edge.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: May 5, 2009
    Assignee: NGK Insulators, Ltd.
    Inventors: Iwao Ohwada, Kei Sato, Nobuyuki Kobayashi, Shohei Yokoyama
  • Patent number: 7518131
    Abstract: An electron beam irradiating apparatus includes a chamber being kept under vacuum, and housing a planar electron emitting element and a positioning unit and an object to be irradiated is directly irradiated with an electron beam emitted from the element. The planar electron emitting element includes: an emitter portion composed of a dielectric material; and a first electrode and a second electrode applied with a driving voltage for emitting electrons, and the first electrode is formed on a first surface of the emitter portion and has a plurality of through-holes where the emitter portion is exposed, a surface of the first electrode facing to the emitter portion around the through-holes is separated from the emitter portion, and the electron beam is emitted from the first surface of the emitter portion through the through-holes.
    Type: Grant
    Filed: March 21, 2006
    Date of Patent: April 14, 2009
    Assignee: NGK Insulators, Ltd.
    Inventors: Tsutomu Nanataki, Iwao Ohwada, Yuki Bessho, Takayoshi Akao
  • Patent number: 7474060
    Abstract: A light source has a light emission section comprising a two-dimensional array of electron emitters and a drive circuit for applying a drive voltage to each of the electron emitters of the light emission section. The drive circuit applies the drive voltage between upper and lower electrodes of each of the electron emitters based on a control signal representative of turn-on/turn-off from an external source (a turn-on/turn-off switch or the like), for thereby controlling each of the electron emitters. Each of the electron emitters has a plate-like emitter, an upper electrode disposed on a face side of the emitter, and a lower electrode disposed on a reverse side of the emitter.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: January 6, 2009
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada, Takayoshi Akao
  • Patent number: 7379037
    Abstract: One image is displayed in a period as one frame, which includes one charge accumulation period and one light emission period. In the charge accumulation period, all electron emitters are scanned, and voltages depending on the luminance levels of corresponding pixels are applied to the electron emitters which correspond to pixels to be turned on (to emit light), to accumulate charges (electrons) in amounts depending on the luminance levels of corresponding pixels in the electron emitters which correspond to pixels to be turned on. In the next light emission period, a constant voltage is applied to all the electron emitters to emit electrons in amounts depending on the luminance levels of corresponding pixels from the electron emitters which correspond to pixels to be turned on, thereby emitting light from the pixels to be turned on.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: May 27, 2008
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada, Takayoshi Akao
  • Patent number: 7336026
    Abstract: An electron emitter has an emitter made of a dielectric material and an upper electrode and a lower electrode for being supplied with a drive voltage for emitting electrons. The upper electrode is disposed on an upper surface of the emitter, and the lower electrode is disposed on a lower surface of the emitter. The upper electrode has a plurality of through regions through which the emitter is exposed. Each of the through regions of the upper electrode has a peripheral portion having a surface facing the emitter and spaced from the emitter.
    Type: Grant
    Filed: September 27, 2004
    Date of Patent: February 26, 2008
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada, Takayoshi Akao
  • Patent number: RE40489
    Abstract: One selection period S and display cycles Td of a number corresponding to a maximum gradation level are allotted in one field, and the display cycle Td is composed of an unselection period U and a reset period R to perform the following control. A row electrode-driving circuit is used to output a selection pulse Ps during the selection period S, output an unselection signal Su during the unselection period U in the display cycle Td, and output a reset pulse Pr during the reset period R. A column electrode-driving circuit is used to output an ON signal during a light emission maintenance period, and output an OFF signal at least at an end timing of the light emission maintenance period, of the period other than the light emission maintenance period. Accordingly, it is possible to effectively reduce the electric power consumption, and it is possible to achieve the high brightness.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: September 9, 2008
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Iwao Ohwada, Takayoshi Akao