Patents by Inventor Takashi Umemoto

Takashi Umemoto 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: 20090015989
    Abstract: The invention provides a solid electrolytic capacitor which can suppress increase of a leakage current due to a heat load, and a method for producing the solid electrolytic capacitor. The solid electrolytic capacitor includes an anode body, a dielectric layer formed on a surface of the anode body, a conductive polymer layer formed on the dielectric layer, and a cathode layer formed on the conductive polymer layer. The dielectric layer contains at least one metal element which is selected from the group consisting of tungsten (W), molybdenum (Mo), vanadium (V) and chromium (Cr) and which has a concentration distribution in a direction of the thickness of the dielectric layer (i.e. in a direction from the cathode side to the anode side of the dielectric layer) so that the concentration of the metal element is maximized at an interface between the dielectric layer and the conductive polymer layer.
    Type: Application
    Filed: July 9, 2008
    Publication date: January 15, 2009
    Applicant: SANYO ELECTRIC CO., LTD
    Inventors: Kazuhiro Takatani, Mutsumi Yano, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20090002923
    Abstract: A solid electrolytic capacitor has an anode body including a porous sintered body consisting of a valve action metal, a dielectric layer deposited on a surface of the anode body, a conductive polymer layer deposited on a surface of the dielectric layer, and a cathode layer deposited on a surface of the conductive polymer layer. The conductive polymer layer includes a laminated film consisting of a first conductive polymer layer formed by a chemical polymerization process and a second conductive polymer layer formed by an electrolytic polymerization process. The first conductive polymer layer has recesses on its surface against the dielectric layer. Interior surfaces of such recesses define cavities which constitute pores at an interface between the first conductive polymer layer and the dielectric layer. These pores are distributed at intervals along the interface between the first conductive polymer layer and the dielectric layer in such a way that the dielectric layer is exposed to their interior surfaces.
    Type: Application
    Filed: May 21, 2008
    Publication date: January 1, 2009
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Yasumi KOBAYASHI, Takashi UMEMOTO, Hiroshi NONOUE
  • Patent number: 7471504
    Abstract: In a solid electrolytic capacitor provided with an anode, a cathode, and a dielectric layer formed by anodization of the anode, the anode includes a first metal layer and a second metal layer. The first metal layer is made of any of metal selected from niobium, aluminum and tantalum, or an alloy containing any of metal selected from niobium, aluminum and tantalum as a main component. The second metal layer contains any of metal selected from titanium, zirconium and hafnium. Here, a part of a surface of the first metal layer is covered with the second metal layer.
    Type: Grant
    Filed: November 26, 2007
    Date of Patent: December 30, 2008
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Kazuhiro Takatani, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080316680
    Abstract: The present invention is to provide a solid electrolytic capacitor having a small equivalent series resistance. In this solid electrolytic capacitor, a capacitor element is buried inside of an outer package of an epoxy resin or the like, the capacitor element including an anode in which a part of an anode lead is buried, a dielectric layer which is formed on the anode and contains a niobium oxide and a cathode which is formed on the dielectric layer. The cathode includes a first electrolyte layer which is formed on the dielectric layer and contains a conductive polymer, an intermediate layer which is formed on the first electrolyte layer and contains organic silane, a second electrolyte layer which is formed on the intermediate layer and contains a conductive polymer, a first conductive layer which is formed on the second electrolyte layer and contains carbon particles and a second conductive layer which is formed on the first conductive layer and contains silver particles.
    Type: Application
    Filed: August 28, 2007
    Publication date: December 25, 2008
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Takahisa Iida, Mutsumi Yano, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080297982
    Abstract: One aspect of the embodiment provides a solid electrolytic capacitor that comprises: an anode; a dielectric layer formed on the surface of this anode; an electrically-conductive polymer layer formed on the dielectric layer; and a cathode layer formed on this electrically-conductive polymer layer. At least manganese is contained in the dielectric layer, and the manganese distributes in a way that the manganese is present more in a part of the dielectric layer that is closer to the cathode (or in the interface between the dielectric layer and the electrically-conductive polymer layer).
    Type: Application
    Filed: May 12, 2008
    Publication date: December 4, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080266756
    Abstract: Particles of a valve metal and a binder are mixed and kneaded together. The mixed-kneaded matter obtained thereby is molded, and a through-hole is formed in the molded body. An anode body is formed by sintering the molded body. A dielectric layer is formed on the surface of the anode body thus formed. Subsequently, an conducting polymer layer is formed on the dielectric layer.
    Type: Application
    Filed: April 15, 2008
    Publication date: October 30, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Masayuki FUJITA, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080259527
    Abstract: Disclosed are a niobium solid electrolytic capacitor capable of reducing leak current that may occur in high heat treatment in a reflow process and capable of preserving the capacity before and after heat treatment, and a method for producing it. The niobium solid electrolytic capacitor comprises an anode containing an oxide of niobium monoxide or niobium dioxide and a metal of niobium or a niobium alloy, a dielectric layer formed on the surface of the anode, and a cathode formed on the dielectric layer, wherein the dielectric layer contains fluorine.
    Type: Application
    Filed: April 7, 2008
    Publication date: October 23, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Yasumi KOBAYASHI, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080259529
    Abstract: A solid electrolytic capacitor includes an anode substrate, a dielectric layer provided on the anode substrate, a first cathode layer provided on the dielectric layer, and a second cathode layer provided on the first cathode layer. The first cathode layer is a layer made of polyethylenedioxythiophene and polypyrrole. The second layer is a layer made of polypyrrole.
    Type: Application
    Filed: December 4, 2007
    Publication date: October 23, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kazuhiro Takatani, Mutsumi Yano, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080259528
    Abstract: Provided is a solid electrolytic capacitor with a high capacity occurrence rate and a high capacity and a method for manufacturing the solid electrolytic capacitor. An anode body is formed on a periphery of an anode lead having a hollow structure. The anode body has a porous body of a valve metal or an alloy of the metal as its main component. The hollow structure allows an inside and an outside of the anode body to connect with each other. A dielectric layer is formed on a surface of the anode body, and a conducting polymer layer is formed on a surface of the dielectric layer. When the conducting polymer layer is formed, the inside of the anode body is depressurized by suction from the outside of the anode body through the hollow structure of the anode lead.
    Type: Application
    Filed: April 9, 2008
    Publication date: October 23, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Masayuki FUJITA, Takashi UMEMOTO, Hiroshi NONOUE
  • Publication number: 20080239630
    Abstract: The present invention provides an electrolytic capacitor having a large electrostatic capacity. In the solid electrolytic capacitor, a capacitor element provided with; an anode in which a part of an anode lead is embedded in the inside of an outer package made of an epoxy resin or the like; an oxide layer containing niobium oxide formed on the anode; and a cathode formed on the oxide layer; is embedded. The anode lead is composed of a niobium alloy containing at least one of vanadium and zirconium, and its one end is embedded in the anode composed of a porous sintered body of metal particles containing niobium, and the other end is connected to an anode terminal. The cathode is composed of a conductive polymer layer such as polypyrrole, a first conductive layer containing carbon particles, and a second conductive layer containing silver particles, and one end of a cathode terminal is connected to the cathode via a third conductive layer containing silver particles.
    Type: Application
    Filed: August 10, 2007
    Publication date: October 2, 2008
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Hiroaki Izu, Takahisa Iida, Mutsumi Yano, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080239631
    Abstract: The solid electrolytic capacitor includes an anode body formed of a sintered body consisting of metal particles; a dielectric layer provided on the top surface of the anode body; and a conducting polymer layer provided on the top surface of the dielectric layer. The anode body includes a first anode portion and a second anode portion which is provided in a way that the second anode portion covers the first anode portion, and in that the particle diameter of metal particles for the second anode portion is smaller than that of metal particles for the first anode portion.
    Type: Application
    Filed: March 24, 2008
    Publication date: October 2, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Masayuki Fujita, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080232036
    Abstract: The present invention relates to a solid electrolytic capacitor provided with a anode made of a metal or an alloy having valve action, a dielectric layer formed on the anode, and an electrolyte layer consisting of a conductive polymer layer formed so as to have contact with a portion of the region on the dielectric layer surface and a manganese dioxide layer formed so as to have contact with the other portion of the region on the dielectric layer surface.
    Type: Application
    Filed: March 10, 2008
    Publication date: September 25, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kikuko Kato, Mutsumi Yano, Kazuhiro Takatani, Koichi Nishimura, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080148541
    Abstract: An object of the present invention is to provide a solid electrolytic capacitor having a low defective fraction. A solid electrolytic capacitor of the present invention includes an anode structured by an anode lead formed by a valve metal, and porous body of valve metal connected to the anode, and a dielectric layer provided on a surface of the anode wherein a Vickers hardness of the dielectric layer, which is positioned not more than 20 ?m in depth from a surface of the anode lead is set 30 Hv-70 Hv.
    Type: Application
    Filed: November 23, 2007
    Publication date: June 26, 2008
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Koichi Nishimura, Hiroshi Nonoue, Takashi Umemoto
  • Patent number: 7362561
    Abstract: In a solid electrolytic capacitor provided with an anode, a cathode, and a dielectric layer formed by anodization of the anode, the anode includes a first metal layer and a second metal layer. The first metal layer is made of any of metal selected from niobium, aluminum and tantalum, or an alloy containing any of metal selected from niobium, aluminum and tantalum as a main component. The second metal layer contains any of metal selected from titanium, zirconium and hafnium. Here, a part of a surface of the first metal layer is covered with the second metal layer.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: April 22, 2008
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Kazuhiro Takatani, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080084652
    Abstract: In a solid electrolytic capacitor provided with an anode, a cathode, and a dielectric layer formed by anodization of the anode, the anode includes a first metal layer and a second metal layer. The first metal layer is made of any of metal selected from niobium, aluminum and tantalum, or an alloy containing any of metal selected from niobium, aluminum and tantalum as a main component. The second metal layer contains any of metal selected from titanium, zirconium and hafnium. Here, a part of a surface of the first metal layer is covered with the second metal layer.
    Type: Application
    Filed: November 26, 2007
    Publication date: April 10, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kazuhiro Takatani, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20080047116
    Abstract: Provided is a method of producing an electrolytic capacitor being higher in capacitance, lower in leakage current, and difficult to deteriorate these properties even when processed in a heat-treatment process such as reflow soldering process. In the method of producing a solid electrolytic capacitor, firstly, an anode containing a valve metal is prepared. Then, the anode is anodized in an aqueous solution of 0.1% by weight of ammonium hexafluorosilicate to form a dielectric layer on the surface of the anode. An electrolyte layer of polypyrrole is formed on the dielectric layer, and further a cathode is formed on the electrolyte layer. Subsequently, an anode lead is connected to the anode and a cathode lead is connected to the cathode, and these are covered with a resin layer of an epoxy resin.
    Type: Application
    Filed: July 25, 2007
    Publication date: February 28, 2008
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Kazuhiro TAKATANI, Takahisa Iida, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20070285876
    Abstract: A solid electrolytic capacitor includes a capacitor element having a niobium oxide layer arranged between an anode and a cathode, and an outer package covering the capacitor element. The niobium oxide layer contains fluorine and phosphorus, and the outer package contains epoxy resin, phenol resin, filler and an imidazole compound.
    Type: Application
    Filed: May 29, 2007
    Publication date: December 13, 2007
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kazuhiro Takatani, Mutsumi Yano, Hiroaki Izu, Takahisa Iida, Takashi Umemoto, Hiroshi Nonoue
  • Publication number: 20070232012
    Abstract: In a solid electrolytic capacitor provided with an anode, a cathode, and a dielectric layer formed by anodization of the anode, the anode includes a first metal layer and a second metal layer. The first metal layer is made of any of metal selected from niobium, aluminum and tantalum, or an alloy containing any of metal selected from niobium, aluminum and tantalum as a main component. The second metal layer contains any of metal selected from titanium, zirconium and hafnium. Here, a part of a surface of the first metal layer is covered with the second metal layer.
    Type: Application
    Filed: March 29, 2007
    Publication date: October 4, 2007
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kazuhiro Takatani, Takashi Umemoto, Hiroshi Nonoue
  • Patent number: 7265071
    Abstract: A dielectric ceramic composition characterized as containing a dielectric material which contains a dielectric composition represented by the compositional formula a.Li2O-b.(CaO1?x—SrOx)-c.R2O3-d.TiO2 (wherein x satisfies 0?x<1; R is at least one selected from La, Y and other rare-earth metals; and a, b, c and d satisfy 0?a?20 mol %, 0?b?45 mol %, 0<c?20 mol % and 40?d?80 mol %) and at least one of oxides of Group 4 and Group 14 metallic elements of the Periodic Table.
    Type: Grant
    Filed: February 14, 2005
    Date of Patent: September 4, 2007
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Takashi Umemoto, Rintaro Aoyagi, Hiroshi Nonoue, Kenichiro Wakisaka
  • Publication number: 20070188981
    Abstract: A solid electrolytic capacitor includes an anode and a dielectric layer. The anode is made of niobium or a niobium alloy. The dielectric layer is made of niobium oxide formed on the niobium or the niobium alloy. The niobium oxide has a feature that a full width at half maximum of a peak of an Mz ray of characteristic X-rays of niobium is 0.98 ? or more. The characteristic X-rays are emitted when the niobium oxide is irradiated with an electron beam.
    Type: Application
    Filed: February 27, 2007
    Publication date: August 16, 2007
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kazuhiro Takatani, Kazumi Kurooka, Tomoko Omori, Mutsumi Yano, Takashi Umemoto, Hiroshi Nonoue