Patents by Inventor Tadashi Fujieda

Tadashi Fujieda 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: 20150221845
    Abstract: In a thermoelectric conversion device, support substrates (13, 14), electrodes (11, 12) formed on the support substrates and thermoelectric conversion parts (7, 10) formed on the electrodes and containing semiconductor glass are disposed. The semiconductor glass is non-lead glass containing vanadium, and the electrodes contain any of Al, Ti, Ti nitride, W, W nitride, W silicide, Ta, Cr and Si. This constitution makes it possible to provide a device structure which can be produced by an inexpensive production process, uses a composite material with an excellent thermoelectric conversion characteristic and can solve the characteristic problem of the composite material. As a result, it is possible to provide a thermoelectric conversion device with excellent characteristics and high reliability at a low cost.
    Type: Application
    Filed: August 31, 2012
    Publication date: August 6, 2015
    Inventors: Chisaki Takubo, Hideaki Takano, Kengo Asai, Takashi Naito, Tadashi Fujieda, Yuichi Sawai, Noriyuki Sakuma
  • Publication number: 20150187510
    Abstract: An electronic component has an organic member between two transparent substrates, in which outer peripheral portions of the two transparent substrates are bonded by a sealing material containing to melting glass. The low melting glass contains vanadium oxide, tellurium oxide, iron oxide and phosphoric acid, and satisfies the following relations (1) and (2) in terms of oxides. The sealing material is formed of a sealing material paste which contains the low melting glass, a resin binder and a solvent, the low melting glass containing vanadium oxide, tellurium oxide, iron oxide and phosphoric acid, and satisfies the following relations (1) and (2) in terms of the oxides. Thereby, thermal damages to an organic element or an organic material contained in the electronic component can be reduced and an electronic component having a glass bonding layer of high reliability can be produced efficiently.
    Type: Application
    Filed: July 25, 2013
    Publication date: July 2, 2015
    Inventors: Takashi Naito, Shinichi Tachizono, Kei Yoshimura, Yuji Hashiba, Motomune Kodama, Masanori Miyagi, Takuya Aoyagi, Yuichi Sawai, Tadashi Fujieda, Takeshi Tsukamoto, Hajime Murakami
  • Patent number: 9023522
    Abstract: A cathode for a lithium-ion secondary battery is provided, which not only efficiently absorbs oxygen released from a solid solution based cathode active material when initial charging is applied but prevents a cathode energy density from lowering. Further, a lithium-ion secondary battery, a vehicle and a power storage system equipped with the lithium-ion secondary battery are provided. The cathode for a lithium-ion secondary battery comprises a cathode active material represented by the general formula: xLi2MO3-(1?x)LiM?O2 (where 0<x<1; M is at least one element selected from the group of Mn, Ti and Zr; and M? is at least one element selected from the group of Ni, Co, Mn, Fe, Ti, Zr, Al, Mg, Cr and V), and an oxygen absorbing substance having both oxygen absorbing and lithium-ion intercalation/de-intercalation abilities. Herein, the oxygen absorbing substance is disposed on the cathode active material.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: May 5, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Akira Gunji, Shin Takahashi, Takashi Naito, Tadashi Fujieda
  • Patent number: 8951436
    Abstract: A lithium ion secondary battery has a high cycle retention rate, and has its battery capacity increased. A positive electrode active material is used which includes a crystal phase having a structure formed by collecting a plurality of crystallites, and powder particles containing amorphous phases and formed between the crystallites. The amorphous phases and contain one or more kinds of metal oxides selected from the group consisting of vanadium oxide, iron oxide, manganese oxide, nickel oxide and cobalt oxide. The crystal phase and the amorphous phase and are capable of intercalation and deintercalation of lithium ions.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: February 10, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Yuji Hashiba, Kei Yoshimura, Shinichi Tachizono, Takashi Naito, Takuya Aoyagi, Tadashi Fujieda
  • Publication number: 20150028333
    Abstract: A metal matrix composite having high corrosion resistance even if the coating film deposit amount is low is obtained. A metal matrix composite includes a metal or alloy substrate coated with a molten transition metal oxide glass, wherein the transition metal oxide glass has an n-type polarity. Further, a method for producing a metal matrix composite includes a step of applying a paste containing a transition metal oxide glass, an organic binder, and an organic solvent onto the surface of a metal or alloy substrate, and a step of forming a glass coating film on the substrate by heating to and maintaining a temperature equal to or higher than the softening point of the transition metal oxide glass after the application step, wherein the transition metal oxide glass has an n-type polarity.
    Type: Application
    Filed: January 15, 2013
    Publication date: January 29, 2015
    Applicant: HITACHI, LTD.
    Inventors: Tadashi Fujieda, Takashi Naito, Takuya Aoyagi, Yuichi Sawai
  • Publication number: 20150020879
    Abstract: To improve the gas barrier property of a laminate containing a substrate containing resin or rubber and oxide glass. A laminate 8 comprising a substrate 9 containing resin or rubber and oxide glass 10 formed at least on one surface of the substrate, in which the oxide glass softens and fluidizes at a temperature equal to or lower than the softening temperature of the substrate and adheres to the substrate.
    Type: Application
    Filed: November 21, 2012
    Publication date: January 22, 2015
    Applicant: Hitachi, Ltd.
    Inventors: Yuichi Sawai, Takashi Naito, Takuya Aoyagi, Tadashi Fujieda, Hajime Murakami, Hiroshi Yoshida, Masahiko Ogino, Akihiro Miyauchi
  • Publication number: 20150017409
    Abstract: The gas barrier property of a laminate constituted by a base material containing a resin or a rubber and an oxide glass is improved. A composite member containing an oxide glass 2 formed as a layer densely on a base material 1 containing a resin or a rubber, in which the oxide glass is bonded to the base material by irradiating the oxide glass with an electromagnetic wave and softening and fluidizing the oxide glass.
    Type: Application
    Filed: November 21, 2012
    Publication date: January 15, 2015
    Applicant: Hitachi, Ltd.
    Inventors: Takashi Naito, Tadashi Fujieda, Takuya Aoyagi, Yuichi Sawai, Hajime Murakami, Masahiko Ogino, Akihiro Miyauchi, Hiroshi Yoshida
  • Publication number: 20150008573
    Abstract: Bondability and heat conductivity of a bonded body in which some of metal, ceramic, or semiconductor are bonded to each other are improved. In the bonded body in which a first member and a second member each comprise one of metal, ceramic, or semiconductor are bonded to each other, the second member is bonded to the first member by way of an adhesive member disposed to the surface of the first member, and the adhesive member contains a V2O5-containing glass and metal particles.
    Type: Application
    Filed: November 21, 2012
    Publication date: January 8, 2015
    Inventors: Yuichi Sawai, Takashi Naito, Takuya Aoyagi, Tadashi Fujieda, Mutsuhiro Mori
  • Publication number: 20140378581
    Abstract: Mechanical strength of a composite material is enhanced by a simple process. In a composite material comprising a resin or a rubber and an oxide glass, the resin or the rubber is dispersed in the oxide glass, or the oxide glass is dispersed in the resin or the rubber. The composite material has a function that the oxide glass is softened and fluidized by electromagnetic waves.
    Type: Application
    Filed: November 19, 2012
    Publication date: December 25, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Takuya Aoyagi, Takashi Naito, Tadashi Fujieda, Yuichi Sawai, Hajime Murakami, Hiroshi Yoshida, Akihiro Miyauchi, Masahiko Ogino
  • Publication number: 20140334937
    Abstract: Mechanical strength of a composite material is enhanced by a simple process. In a composite material comprising a resin or a rubber and an oxide glass, the resin or the rubber is dispersed in the oxide glass, or the oxide glass is dispersed in the resin or the rubber, and the oxide glass is softened and fluidized by heating at or lower than a heat decomposition temperature of the resin or the rubber.
    Type: Application
    Filed: November 1, 2012
    Publication date: November 13, 2014
    Applicant: HITACHI, LTD.
    Inventors: Tadashi Fujieda, Takashi Naito, Takuya Aoyagi, Yuichi Sawai, Hajime Murakami, Hiroshi Yoshida, Akihiro Miyauchi, Masahiko Ogino
  • Publication number: 20140287227
    Abstract: Disclosed is a jointed body wherein multiple base members are jointed to each other through a jointing layer, and at least one of the base members is a base member of a ceramic material, semiconductor or glass. The joint material layer contains a metal and an oxide. The oxide contains V and Te, and is present between the metal and the base members. Disclosed is also a joint material in the form of a paste containing an oxide glass containing V and Te, metal particles, and a solvent; in the form of a foil piece or plate in which particles of an oxide glass containing V and Te are embedded; or in the form of a foil piece or plate containing a layer of an oxide glass containing V and Te, and a layer of a metal.
    Type: Application
    Filed: February 12, 2014
    Publication date: September 25, 2014
    Applicant: HITACHI, LTD.
    Inventors: Motomune KODAMA, Takashi NAITO, Tadashi FUJIEDA, Yuichi SAWAI, Takuya AOYAGI, Masanori MIYAGI
  • Publication number: 20140285039
    Abstract: An aluminum wire body, in which an aluminum or aluminum alloy electric wire and a metal to be joined are joined by solder, wherein the solder includes an oxide glass including vanadium and a conducting particle. Preferably, the conducting particle contained in the solder is 90% by volume or less and the oxide glass is 20% by volume to 90% by volume. Further preferably, the oxide glass includes 40% by mass or more of Ag2O in terms of oxides and the glass transition point is 180° C. or less.
    Type: Application
    Filed: February 11, 2014
    Publication date: September 25, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Takuya AOYAGI, Motomune KODAMA, Takashi NAITO, Tadashi FUJIEDA, Yuichi SAWAI, Masanori MIYAGI, Haruo AKAHOSHI, Norihisa IWASAKI
  • Patent number: 8802963
    Abstract: A thermoelectric conversion material is provided, in which only a desired crystal is selectively precipitated. An MxV2O5 crystal is selectively precipitated in vanadium-based glass, wherein M is one metal element selected from the group consisting of iron, arsenic, antimony, bismuth, tungsten, molybdenum, manganese, nickel, copper, silver, an alkali metal and an alkaline earth metal, and 0<x<1.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: August 12, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Tadashi Fujieda, Takashi Naito, Takuya Aoyagi
  • Publication number: 20140145122
    Abstract: The present invention aims at providing a lead-free glass composition that can be soften and flowed at a firing temperature that is equal to or lower than that of conventional low melting point lead glass. Furthermore, the present invention aims at providing a lead-free glass composition having fine thermal stability and fine chemical stability in addition to that property. The lead-free glass composition according to the present invention is characterized by comprising at least Ag2O, V2O5 and TeO2 when the components are represented by oxides, wherein the total content ratio of Ag2O, V2O5 and TeO2 is 75 mass % or more. Preferably, the lead-free glass composition comprises 10 to 60 mass % of Ag2O, 5 to 65 mass % of V2O5, and 15 to 50 mass % of TeO2.
    Type: Application
    Filed: June 25, 2012
    Publication date: May 29, 2014
    Inventors: Yuichi Sawai, Takashi Naito, Takuya Aoyagi, Tadashi Fujieda
  • Publication number: 20130260095
    Abstract: A glass substrate having a fine structure on the surface thereof, wherein said glass substrate is made of vanadium-containing glass and said vanadium-containing glass has a resistivity no higher than 109 ?·cm, with the content of vanadium (in the form of V2O5) being no less than 10 wt % and no more than 60 wt %. The glass substrate prevents dust attraction and retains its antifouling properties over a long period of time.
    Type: Application
    Filed: February 19, 2013
    Publication date: October 3, 2013
    Applicant: HITACHI, LTD.
    Inventors: Yuzuru SHIMAZAKI, Takashi NAITO, Takuya AOYAGI, Yuichi SAWAI, Tadashi FUJIEDA, Akihiro MIYAUCHI, Masahiko OGINO
  • Publication number: 20130126864
    Abstract: In order to provide a semiconductor junction element consisted of an oxide semiconductor glass, which does not contain a toxic element and rare metal element, and various semiconductor devices using it, semiconductor glasses which contain vanadium oxide and have different polarities are connected each other in a semiconductor junction element of the present invention. Moreover, a semiconductor glass containing vanadium oxide is connected to an element semiconductor or a compound semiconductor which have different polarity from the semiconductor glass. Furthermore, a semiconductor glass containing vanadium oxide is connected to a metal.
    Type: Application
    Filed: September 2, 2011
    Publication date: May 23, 2013
    Applicant: HITACHI, LTD.
    Inventors: Tadashi Fujieda, Takashi Naito, Takuya Aoyagi, Hiroki Yamamoto, Motoyuki Miyata
  • Publication number: 20130015410
    Abstract: A lithium ion secondary battery has a high cycle retention rate, and has its battery capacity increased. A positive electrode active material is used which includes a crystal phase having a structure formed by collecting a plurality of crystallites 101, and powder particles containing amorphous phases 103a and 103b formed between the crystallites 101. The amorphous phases 103a and 103b contain one or more kinds of metal oxides selected from the group consisting of vanadium oxide, iron oxide, manganese oxide, nickel oxide and cobalt oxide. The crystal phase and the amorphous phase 103a and 103b are capable of intercalation and deintercalation of lithium ions.
    Type: Application
    Filed: March 31, 2011
    Publication date: January 17, 2013
    Inventors: Yuji Hashiba, Kei Yoshimura, Shinichi Tachizono, Takashi Naito, Takuya Aoyagi, Tadashi Fujieda
  • Publication number: 20120164537
    Abstract: In a positive electrode active material for a magnesium secondary battery and a magnesium secondary battery using it, there is contained a powder particle containing a crystal phase having a structure formed with aggregation of a plurality of crystallites, and amorphous phases formed between the crystallites themselves; the amorphous phases contain at least one kind of a metal oxide selected from a vanadium oxide, an iron oxide, a manganese oxide, a nickel oxide and a cobalt oxide; and the crystal phase and the amorphous phases use the positive electrode active material enabling to store and release magnesium ions.
    Type: Application
    Filed: December 20, 2011
    Publication date: June 28, 2012
    Inventors: Takuya AOYAGI, Takashi Naito, Tadashi Fujieda, Yuichi Sawai, Katsunori Nishimura, Masahiro Yonemoto
  • Publication number: 20120161273
    Abstract: A thermoelectric conversion material is provided, in which only a desired crystal is selectively precipitated. An MxV2O5 crystal is selectively precipitated in vanadium-based glass, wherein M is one metal element selected from the group consisting of iron, arsenic, antimony, bismuth, tungsten, molybdenum, manganese, nickel, copper, silver, an alkali metal and an alkaline earth metal, and 0<x<1.
    Type: Application
    Filed: December 22, 2011
    Publication date: June 28, 2012
    Inventors: Tadashi Fujieda, Takashi Naito, Takuya Aoyagi
  • Publication number: 20110217592
    Abstract: A cathode for a lithium-ion secondary battery is provided, which not only efficiently absorbs oxygen released from a solid solution based cathode active material when initial charging is applied but prevents a cathode energy density from lowering. Further, a lithium-ion secondary battery, a vehicle and a power storage system equipped with the lithium-ion secondary battery are provided. The cathode for a lithium-ion secondary battery comprises a cathode active material represented by the general formula: xLi2MO3-(1?x)LiM?O2 (where 0<x<1; M is at least one element selected from the group of Mn, Ti and Zr; and M? is at least one element selected from the group of Ni, Co, Mn, Fe, Ti, Zr, Al, Mg, Cr and V), and an oxygen absorbing substance having both oxygen absorbing and lithium-ion intercalation/de-intercalation abilities. Herein, the oxygen absorbing substance is disposed on the cathode active material.
    Type: Application
    Filed: February 24, 2011
    Publication date: September 8, 2011
    Inventors: Akira GUNJI, Shin TAKAHASHI, Takashi NAITO, Tadashi FUJIEDA