Aluminum Or Tantalum Patents (Class 361/529)
  • Patent number: 7948740
    Abstract: A method of manufacturing a solid electrolytic capacitor includes: rolling an anode foil, a cathode foil and a separator together, the separator being a mixed fiber composed of a chemical fiber and a natural fiber and being between the anode foil and the cathode foil; degrading and removing the natural fiber with enzyme; and forming an electrolytic layer composed of solid polymer between the anode foil and the cathode foil after degrading and removing the natural fiber.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: May 24, 2011
    Assignee: Nichicon Corporation
    Inventors: Minoru Funahashi, Akira Ueda, Katsuharu Yamada
  • Patent number: 7940516
    Abstract: A capacitor including a substrate; a conductive layer provided on the substrate and containing conductive particles; a valve metal sheet having a dielectric part formed throughout an entire surface of the conductive layer; a protection layer covering the valve metal sheet; a first electrode terminal electrically connected to the conductive layer and partially exposed from an external surface of the protection layer; and a second electrode terminal electrically connected to a surface of the valve metal sheet which is opposite to a surface of the valve metal sheet on which the dielectric part is provided, and the second electrode terminal partially exposed from the external surface of the protection layer; wherein the dielectric part is made of an oxide of a metallic material of the valve metal sheet, the dielectric part is formed with a corrugated surface on the conductive layer, and the conductive particles of the conductive layer are in contact with the corrugated surface of the dielectric part.
    Type: Grant
    Filed: August 4, 2010
    Date of Patent: May 10, 2011
    Assignee: Fujitsu Limited
    Inventors: Takeshi Shioga, Kazuaki Kurihara
  • Patent number: 7940515
    Abstract: A solid electrolytic capacitor includes an anode body made of valve metal, a dielectric oxide layer provided on the anode body, and a conductive layer provided on the carbon layer. The carbon layer contains carbon and aromatic compound having sulfonic acid radical. This solid electrolytic capacitor has a small equivalent series resistance.
    Type: Grant
    Filed: July 5, 2007
    Date of Patent: May 10, 2011
    Assignee: Panasonic Corporation
    Inventor: Masato Ozawa
  • Patent number: 7929273
    Abstract: A chip type solid electrolytic capacitor includes a capacitor element-laminate. In the capacitor element-laminate, a plurality of capacitor elements, each having an anode portion and a cathode portion, are laminated so that the anode portions of the adjacent capacitor elements are disposed in the direction opposite to each other. Anode lead terminals are joined to the bottom faces of the anode portions of the capacitor elements disposed at both ends of the capacitor element-laminate. A cathode lead terminal is joined to the bottom face of the cathode portion of the capacitor element disposed in the center of the capacitor element-laminate. An Electrically insulating exterior resin coats the capacitor element-laminate so as to expose at least a part of the bottom faces of the anode lead terminals and a part of the cathode lead terminal.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: April 19, 2011
    Assignee: Panasonic Corporation
    Inventors: Tatsuo Fujii, Junichi Kurita, Hiroshi Fujii, Tsuyoshi Yoshino
  • Patent number: 7916455
    Abstract: A conductive composition comprises a ? conjugated conductive polymer, a dopant composed of polyanion, and at least one crosslinking site forming compound selected from (a) compounds having a glycidyl group and (b) compounds having a hydroxyl group and one selected from the group consisting of allyl, vinyl ether, methacryl, acryl, methacrylamide, and acrylamide groups. An antistatic coating material comprises a ? conjugated conductive polymer, polyanion, at least one crosslinking site forming compound selected form the above (a) and (b), and a solvent. An antistatic coating is formed by applying the above-mentioned antistatic coating material. In a capacitor comprising an anode composed of a valve metal porous body; a dielectric layer formed by oxidizing the surface of the anode; and a cathode formed on the dielectric layer, the cathode has a solid electrolyte layer formed by crosslinking complexes of a ? conjugated conductive polymer and a dopant composed of a polyanion.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: March 29, 2011
    Assignee: Shin-Etsu Polymer Co., Ltd.
    Inventors: Kazuyoshi Yoshida, Tailu Ning, Yasushi Masahiro
  • Patent number: 7898795
    Abstract: A solid-state electrolytic capacitor including a stacked body of a solid-state electrolytic capacitor element unit and an electrode conversion board. The unit includes two kinds of solid-state electrolytic capacitor elements. Each of first kind of solid-state electrolytic capacitor elements uses an anode body having a total thickness of an aluminum foil of 350 ?m and a residual core thickness, i.e., the total thickness minus the thickness of an etched layer, is 50 ?m. A second kind of solid-state electrolytic capacitor element provided on the mounting surface side uses an anode body having a total thickness of an aluminum foil of 150 ?m and a residual core thickness is 50 ?m. The electrode conversion board includes external anode and external cathode terminals that are arranged in a checkered manner and also includes, on the side opposite to the board, anode electrode and cathode electrode plates.
    Type: Grant
    Filed: June 5, 2008
    Date of Patent: March 1, 2011
    Assignee: NEC TOKIN Corporation
    Inventors: Takeo Kasuga, Masanori Takahashi, Koji Sakata, Yuji Yoshida, Takeshi Saito, Katsuhiro Yoshida
  • Publication number: 20110026192
    Abstract: Solid electrolytic capacitors and related methods for forming such capacitors may variously involve forming at least one of a seed, grip, reference point and/or anode body by stencil printing of dry powder. In accordance with a method of forming anodic components for electrolytic capacitors, a stencil is positioned adjacent to a substrate, the stencil being formed to define a plurality of apertures therethrough. A plurality of printed powder portions are selectively printed on the substrate by placing dry powder into selected ones of the plurality of apertures defined in the stencil. The printed powder portions are then sintered to form respective anodic components for multiple respective electrolytic capacitors.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 3, 2011
    Applicant: AVX CORPORATION
    Inventor: Majid Rezai-Kalantary
  • Patent number: 7876548
    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: Grant
    Filed: April 7, 2008
    Date of Patent: January 25, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Yasumi Kobayashi, Takashi Umemoto, Hiroshi Nonoue
  • Patent number: 7872858
    Abstract: A method for manufacturing an electrolytic capacitor comprising the steps of: forming a capacitor element having a pair of electrode foils wound with a separator interposed therebetween; impregnating the capacitor element with a dispersion solution containing particles of an electrically conductive solid or aggregates thereof and a solvent to form a planar electrically conductive solid layer having the particles of the electrically conductive solid or the aggregates thereof on the surfaces of the electrode foils and the separator; and impregnating the capacitor element having the electrically conductive solid layer with an electrolytic solution.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: January 18, 2011
    Assignees: Sanyo Electric Co., Ltd., Sun Electronic Industries Corp.
    Inventors: Kenji Kakuma, Masakazu Hosogi
  • Publication number: 20110007450
    Abstract: The invention relates to the field of electrical engineering, in particular to multilayer film electrodes for electrolytic capacitors. The proposed multilayer anode is implemented as a substrate with a developed surface on which are sequentially arrayed a conforming layer of a valve metal, which is connected by a heterojunction formed by nanoparticles of the substrate metal and of the valve metal, which are geometrically closed between each other, and an oxide coating. The substrate is connected to the film base through a nanocomposite barrier layer, which comprises a differentiated mixture of the materials being joined, whose content varies relative to each other, together they amount to 100%, where the working surface is formed in practice by the substrate metal. What is novel is that a metal with a hardness 2-4 times greater than that of the valve metal, preferably titanium, is used as the substrate material, and the pores of the valve-metal layer are limited in size to the range 1-104 nm.
    Type: Application
    Filed: November 21, 2008
    Publication date: January 13, 2011
    Applicant: Vostok, LLC
    Inventors: Igor Shcherbakov, Vladimir Sleptsov
  • Patent number: 7859829
    Abstract: An electrolytic capacitor includes a cathode body. The cathode body includes a conductive solid layer having particles of conductive solid, formed using a dispersion including particles of conductive solid and a solvent. The particles of the conductive solid in the dispersion have a first particle size distribution peak and a second particle size distribution peak satisfying ?1>?2, where ?1 and ?2 are the average particle size of the first and second particle size distribution peaks, respectively, in particle size distribution measurement. Accordingly, there is provided an electrolytic capacitor reduced in ESR, and further having high withstand voltage and low leakage current.
    Type: Grant
    Filed: April 3, 2008
    Date of Patent: December 28, 2010
    Assignees: SANYO Electric Co., Ltd., SUN Electronic Industries Corp., Shin-Etsu Polymer Co., Ltd.
    Inventors: Kenji Kakuma, Masakazu Hosogi
  • Patent number: 7859824
    Abstract: A solid capacitor and the manufacturing method thereof are disclosed. The solid capacitor consists of a dielectric layer and two electrodes. A plurality of holes formed by an opening process is disposed on surface of the dielectric layer. The two electrodes connect with the dielectric layer by the holes. By means of a plurality of high temperature volatile matters, the plurality of holes is formed on surface of the dielectric layer during sintered process. The holes are connected with the outside so as to increase surface area of the dielectric layer and further the capacity is increased. And the solid capacitor stores charge by physical means. Moreover, the solid capacitor can be stacked repeatedly to become a multilayer capacitor.
    Type: Grant
    Filed: February 20, 2008
    Date of Patent: December 28, 2010
    Assignee: CTECH Corporation
    Inventors: Shang Mei Lee, Ting Keng Lin, Yung Sheng Huang
  • Patent number: 7855870
    Abstract: A solid electrolytic capacitor (1) is prepared by carbonizing a wound element (21) formed by winding an anode foil (22) and a cathode foil (23) together with a separator paper (4) sandwiched therebetween, and forming a solid electrolyte layer, including said separator (4), including a conductive polymer between the anode foil (22) and the cathode foil (23). The separator paper (4) is paper prepared by mixing fibers having low heat resistance and carbonized by said carbonizing, and fibers having high heat resistance not carbonized by said carbonizing, and fibrillated fibers having narrow spaces between fibers are used as said fibers having high heat resistance. The solid electrolytic capacitor has an excellent ESR characteristic, in which a dense solid electrolyte layer can be formed by a chemical polymerization method.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: December 21, 2010
    Assignees: Sanyo Electric Co., Ltd., Saga Sanyo Industries
    Inventor: Kazumasa Fujimoto
  • Patent number: 7855869
    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 anode lead, which is positioned at not more than 20 ?m in depth from a surface of the anode lead is set 30 Hv-70 Hv.
    Type: Grant
    Filed: November 23, 2007
    Date of Patent: December 21, 2010
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Koichi Nishimura, Hiroshi Nonoue, Takashi Umemoto
  • Publication number: 20100318142
    Abstract: An aluminum slug anode usable in capacitors is produced from multiple-stacked layers of aluminum foils. The foils are stacked (possibly after cutting them to have an area similar to the area desired for the anode), hot-pressed, sintered, and anodized to generate the anode. A contact in electrical communication with the foils is formed, as by welding a contact across at least some of the foils. A capacitor casing be formed by situating the anode within a casing which serves as a cathode, with the anode being wrapped in a dielectric such as separator paper.
    Type: Application
    Filed: May 4, 2010
    Publication date: December 16, 2010
    Inventor: Singjang Chen
  • Patent number: 7852614
    Abstract: The invention provides a solid electrolytic capacitor wherein the anode has a dielectric oxide film of a structure less susceptible to damage due to mechanical stresses and which is diminished in leakage current and less prone to short-circuiting, and a process for fabricating the capacitor. The capacitor of the invention comprises an anode of aluminum having a dielectric oxide film formed over a surface thereof from amorphous alumina, and is characterized in that a plurality of tunnel-shaped etching pits are formed in the anode.
    Type: Grant
    Filed: December 9, 2008
    Date of Patent: December 14, 2010
    Assignees: Sanyo Electric Co., Ltd., Saga Sanyo Industries Co., Ltd., Japan Capacitor Industrial Co., Ltd.
    Inventors: Kazumasa Fujimoto, Hiromu Saito, Yasushi Yoshida, Yukio Takeda
  • Patent number: 7848082
    Abstract: A solid capacitor and the manufacturing method thereof are disclosed. The solid capacitor consists of a dielectric layer and two electrodes. A plurality of holes formed by an opening process is disposed on surface of the dielectric layer. The two electrodes connect with the dielectric layer by the holes. By means of a plurality of high temperature volatile matters, the plurality of holes is formed on surface of the dielectric layer during sintered process. The holes are connected with the outside so as to increase surface area of the dielectric layer and further the capacity is increased. And the solid capacitor stores charge by physical means. Moreover, the solid capacitor can be stacked repeatedly to become a multilayer capacitor.
    Type: Grant
    Filed: February 20, 2008
    Date of Patent: December 7, 2010
    Assignee: CTech Corporation
    Inventors: Shang Mei Lee, Ting Keng Lin, Yung Sheng Huang
  • Publication number: 20100302712
    Abstract: A solid electrolytic capacitor that contains a capacitor element that includes an anode body, dielectric layer, and solid electrolyte is provided. The capacitor also contains an anode lead that is electrically connected to the anode body by a refractory metal paste (e.g., tantalum paste). The use of such a refractory metal paste allows the anode lead to be sinter bonded to a surface of the anode body after it is pressed. In this manner, a strong and reliable connection may be achieved without substantially decreasing the surface area of the lead that is available for connection to a termination. Furthermore, because the lead is not embedded within the anode body, the capacitor may be configured so that little, if any, portion of the lead extends beyond the anode body. This may result in a highly volumetrically efficient capacitor with excellent electrical properties.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 2, 2010
    Applicant: AVX Corporation
    Inventors: Stanislav Zednicek, Peter Jacisko, Tomas Karnik, Jiri Navratil
  • Publication number: 20100302714
    Abstract: An exemplary aspect of the invention provides a conductive polymer suspension for providing a conductive polymer material with high conductivity and a method for producing the same, and provides a solid electrolytic capacitor with low ESR and a method for producing the same. In an exemplary embodiment, a monomer providing a conductive polymer is subjected to chemical oxidative polymerization in a solvent comprising a dopant of an organic acid or a salt thereof, using an oxidant, to synthesize the conductive polymer; the conductive polymer is purified; the purified conductive polymer and an oxidant are mixed in an aqueous solvent comprising a polyacid; and an imidazole compound is further added to produce a conductive polymer suspension.
    Type: Application
    Filed: May 17, 2010
    Publication date: December 2, 2010
    Applicant: NEC Tokin Corporation
    Inventors: Ryuta Kobayakawa, Tomoki Nobuta, Naoki Takahashi, Yasuhisa Sugawara, Satoshi Suzuki
  • Publication number: 20100302713
    Abstract: A solid electrolytic capacitor that contains a capacitor element that includes an anode body, dielectric layer, and solid electrolyte is provided. The capacitor also contains an anode lead that is electrically connected to the anode body. Contrary to conventional capacitors in which the lead is welded or connected using a layer of seed particles, a refractory metal paste (e.g., tantalum paste) is employed in the present invention to electrically connect the anode lead to the anode body. The use of such a refractory metal paste allows the anode lead to be sinter bonded to a surface of the anode body after it is pressed. In this manner, a strong and reliable connection may be achieved without substantially decreasing the surface area of the lead that is available for connection to a termination. The paste of the present invention generally contains particles of a relatively small size.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 2, 2010
    Applicant: AVX Corporation
    Inventors: Stanislav Zednicek, William A. Millman
  • Patent number: 7835138
    Abstract: A solid electrolytic capacitor is provided in which volume efficiency of its capacitor element is improved. A converting substrate having an anode terminal forming portion and cathode terminal portion obtained by forming notches on faces exposed on outside faces of the anode and cathode portions and performing plating in the notches in portions in which the anode and cathode portions of a lower-face electrode type solid electrolytic capacitor is connected to the capacitor element and, after a sheathing resin is formed therein, the sheathed portion and converting substrate are cut along cutting planes to form fillet forming faces on the outside faces of the anode portion and cathode portion of the lower-face electrode type solid electrolytic capacitor.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: November 16, 2010
    Assignee: NEC Tokin Corporation
    Inventors: Daisuke Yamashita, Kazuhiro Koike, Kazuyuki Kato, Masako Ohya, Kunihiko Shimizu
  • Patent number: 7835139
    Abstract: Cathode electrode part 5 of flat plate-like element 1 is joined with cathode com terminal 7 with a conductive adhesive or the like. Element mounting part 6a of anode terminal 6 is provided with a pair of joint parts 6b for wrapping anode electrode part 4 from both sides. The tips of joint parts 6b and anode electrode part 4 are joined by laser welding such that the ratio (w/d) of the width (w) of each tip of joint parts 6b and the diameter (d) of the welding trace to be welded is 0.5 to 1.5, and more preferably, 0.5 to 1.25 for providing low ESR means for concentrating the quantity of heat at the time of welding on welding parts 6c without escape. Therefore, a stable welded state is obtained, so that the ESR is improved for achieving low ESR of the solid capacitor.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: November 16, 2010
    Assignee: Panasonic Corporation
    Inventors: Masato Ozawa, Katsuhisa Ishizaki, Kazuo Kawahito, Minoru Omori, Yoshiro Maruhashi
  • Publication number: 20100265634
    Abstract: A capacitor, and method of making a capacitor, is provided wherein the capacitor has exceptionally high break down voltage. The capacitor has a tantalum anode with an anode wire attached there to. A dielectric film is on the tantalum anode. A conductive polymer is on the dielectric film. An anode lead is in electrical contact with the anode wire. A cathode lead is in electrical contact with the conductive polymer and the capacitor has a break down voltage of at least 60 V.
    Type: Application
    Filed: April 20, 2009
    Publication date: October 21, 2010
    Inventors: Yuri Freeman, Jake Yongjian Qiu, Steven C. Hussey, Philip M. Lessner
  • Patent number: 7813108
    Abstract: An electrolytic capacitor includes a first electrode, a second electrode opposite to the first electrode, a separator sandwiched between the first electrode and the second electrode, a cell accommodating the first electrode, the second electrode and the separator, and an electrolytic solution filled into the inner space of the cell, with the first electrode, the second electrode and the separator immersed into the electrolytic solution. The first electrode and second electrode are in a CNT film structure, wherein the CNT film includes a number of CNTs packed closely, entangled and interconnected with each other, and disorderly arranged. The electrolytic capacitor is a high-performance capacitor.
    Type: Grant
    Filed: December 29, 2007
    Date of Patent: October 12, 2010
    Assignees: Tsinghua University, Hon Hai Precision Industry Co., Ltd.
    Inventors: Chang-Hong Liu, Ding Wang, Shou-Shan Fan
  • Patent number: 7808773
    Abstract: To provide electronic parts having a platy terminal secured through a conductive adhesive layer onto a device, which electronic parts are low in ESR and excel in the bonding strength between device and terminal. The conductive adhesive contains a flat conductive member and an organic solvent and is characterized in that through vaporization of the organic solvent in vacuum atmosphere, the flat conductive member has a region standing in the direction of thickness of the conductive adhesive layer. Further, the conductive adhesive is characterized by containing portion wherein the angle between the platy terminal and the flat plane of conductive member is ?45°.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: October 5, 2010
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Atsushi Furuzawa, Kohei Goto
  • Patent number: 7803235
    Abstract: A method to passivate a metal or metal oxide or metal suboxide powder, especially a valve metal powder such as tantalum or niobium and the passivated powders formed therefrom are described. The method includes passivating a starting powder with a gas having at least 25 wt. % oxygen present. Passivation is preferably achieved without performing any evacuation steps. Capacitors made from the passivated powders are also described.
    Type: Grant
    Filed: January 7, 2005
    Date of Patent: September 28, 2010
    Assignee: Cabot Corporation
    Inventor: Sridhar Venigalla
  • Publication number: 20100226070
    Abstract: The present invention relates to the tantalum powder and the process for preparing the same, and also relates to the electrolytic capacitor anode made of the tantalum powder. More particularly, the present invention relates to the tantalum powder having a BET surface area not more than 0.530 m2/g, Fisher mean particle size not less than 3.00 ?m. The present invention relates to the process for preparing the tantalum powder, wherein the tantalum powder is prepared through reducing tantalum compound with a reducing agent, wherein the tantalum powder as seed is added during reduction, and said tantalum powder as seed is the tantalum powder that has been milled.
    Type: Application
    Filed: March 5, 2010
    Publication date: September 9, 2010
    Inventors: Guoqi Yang, Wenfeng Shi, Xifang Bao, Yong Li, Zhongxiang Li, Zhangong Dong, Xiaoyan Yang
  • Patent number: 7778011
    Abstract: A chip type solid electrolytic capacitor includes a capacitor element-laminate. In the capacitor element-laminate, a plurality of capacitor elements, each having an anode portion and a cathode portion, are laminated so that the anode portions of the adjacent capacitor elements are disposed in the direction opposite to each other. Anode lead terminals are joined to the bottom faces of the anode portions of the capacitor elements disposed at both ends of the capacitor element-laminate. A cathode lead terminal is joined to the bottom face of the cathode portion of the capacitor element disposed in the center of the capacitor element-laminate. An Electrically insulating exterior resin coats the capacitor element-laminate so as to expose at least a part of the bottom faces of the anode lead terminals and a part of the cathode lead terminal.
    Type: Grant
    Filed: January 19, 2006
    Date of Patent: August 17, 2010
    Assignee: Panasonic Corporation
    Inventors: Tatsuo Fujii, Junichi Kurita, Hiroshi Fujii, Tsuyoshi Yoshino
  • Publication number: 20100202102
    Abstract: A solid electrolytic capacitor includes an anode foil, a solid electrolyte provided on the anode foil and made of conductive polymer, and a cathode foil provided on the solid electrolyte and facing the anode foil across the solid electrolyte. The anode foil includes an anode base made of aluminum, a rough surface layer made of aluminum and provided on a surface of the anode base, and a dielectric oxide layer provided on the rough surface layer and contacting the solid electrolyte. The cathode foil includes a cathode base made of aluminum, and a nickel layer provided on a surface of the cathode base and contacting the solid electrolyte. The nickel layer faces the dielectric oxide layer of the anode foil across the solid electrolyte. The nickel layer is made of nickel and nickel oxide. This solid electrolytic capacitor has a large capacitance and a low equivalent series resistance while being inexpensive and highly reliable.
    Type: Application
    Filed: October 17, 2008
    Publication date: August 12, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Tatsuji Aoyama, Tsuyoshi Yoshino
  • Patent number: 7773367
    Abstract: A capacitor and a method for assembling a capacitor. A capacitor is assembled from a case, which contains an anode that is electrically coupled to the case and defines wells or slots receiving a plurality of cathode plates. A header is placed on the case. The header also supports a glass seal that insulates the lead tube and cathode lead coming from the cathode. Once assembled, the capacitor is filled with electrolyte. A weld extends around the header to secure the header to the case. A bent cathode configuration enables a plurality of cathode plates electrically coupled together from a common cathode plate.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: August 10, 2010
    Assignee: Tantalum Pellet Company
    Inventor: Todd Knowles
  • Patent number: 7760487
    Abstract: An electrolytic capacitor that includes an anode body formed from a powder comprising electrically conductive ceramic particles and a non-metallic element in an amount of about 100 parts per million or more is provided in one embodiment of the invention. The non-metallic element has a ground state electron configuration that includes five valence electrons at an energy level of three or more. Examples of such elements include, for instance, phosphorous, arsenic, antimony, and so forth. The capacitor also comprises a dielectric layer overlying the anode body and an electrolyte layer overlying the dielectric layer.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: July 20, 2010
    Assignee: AVX Corporation
    Inventor: Tomas Karnik
  • Publication number: 20100165544
    Abstract: An electrode foil includes a structure a structure in which metal particles and ceramic particles, which primarily include at least one of valve metal particles having a dielectric constant and ceramic particles, are deposited on a surface of a metal foil.
    Type: Application
    Filed: October 16, 2009
    Publication date: July 1, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Yoshihiko Imanaka, Minoru Funahashi, Hidetoshi Ishizuka, Katsuharu Yamada
  • Patent number: 7746623
    Abstract: The present invention provides means for forming an oxide film on a metal surface, means for repairing a defect of an oxide film, a high-performance electrolytic capacitor using the means, and an electrolyte of the capacitor. Namely, the prevent invention provides a method for easily forming an oxide film on the surface of a metal or an alloy thereof by anodization using a solution containing an ionic liquid. In an application of this method, an electrolytic capacitor having means for repairing a defect of an oxide film can be formed by a method using, as an electrolyte, an ionic liquid, a solution containing an ionic liquid and a salt, or a solution containing an ionic liquid and a conductive polymer or a TCNQ salt, and a valve metal or an alloy thereof as a metal.
    Type: Grant
    Filed: July 15, 2008
    Date of Patent: June 29, 2010
    Assignee: Kaneka Corporation
    Inventors: Mutsuaki Murakami, Masamitsu Tachibana, Hiroyuki Furutani, Hideo Yamagishi
  • Publication number: 20100149729
    Abstract: A solid electrolyte capacitor comprising an anode with a valve action composed of a metal material or a conductive oxide and having a dielectric layer, a solid electrolyte and a conductive layer, formed in this order on the surface thereof, characterized in that said conductive layer comprises conductive powders which have a particle diameter distribution wherein at least two peaks of particle diameter are present, and the minimum peak particle diameter thereof is in the range of larger than 100 nm but not larger than 1 ?m. The conductive powder preferably has at least one peak having a particle size 8 to 75 times the minimum peak of particle size. The solid electrolyte capacitor has very low equivalent series resistance (ESR).
    Type: Application
    Filed: December 28, 2006
    Publication date: June 17, 2010
    Applicant: SHOWA DENKO K.K.
    Inventor: Masaaki Nishioka
  • Patent number: 7729104
    Abstract: In a hydrogen-containing tantalum powder of the present invention, a value obtained by dividing the hydrogen content (ppm) by the specific surface area (m2/g) is in the range of 10 to 100. This tantalum powder has a large specific surface area, and when the tantalum powder is used as an anode of a solid electrolyte capacitor, a solid electrolyte capacitor having a large capacitance and a low leakage current can be obtained.
    Type: Grant
    Filed: April 12, 2005
    Date of Patent: June 1, 2010
    Assignee: JFE Mineral Company, Ltd.
    Inventors: Nobuyuki Sato, Osamu Ebato, Tadasu Kirihara
  • Patent number: 7729102
    Abstract: A solid electrolytic capacitor 1 includes a capacitor element 2 and a resin package 9 enclosing the capacitor element. The capacitor element includes a sintered body 3 of valve metal powder, an anode 4a provided by embedding an anode wire 4 in the sintered body, and a cathode 5 provided by forming a metal layer on the sintered body. A first lead member 6 in the form of a plate is connected to the anode wire 4. The end of the first lead member projects from a side surface 9a of the resin package 9 to provide an anode terminal T1. A second lead member 7 in the form of a plate is connected to the cathode 5. The end of the second lead member projects from a side surface 9b of the resin package 9 to provide a cathode terminal T2.
    Type: Grant
    Filed: December 1, 2005
    Date of Patent: June 1, 2010
    Assignee: Rohm Co., Ltd.
    Inventor: Chojiro Kuriyama
  • Publication number: 20100128416
    Abstract: A composite cathode foil is provided. The composite cathode foil includes an aluminum substrate, a metal layer formed thereon, a metal carbide layer formed on the metal layer, and a carbon layer formed on the metal carbide layer, wherein the metal of the metal layer is selected from the group consisting of IVB, VB and VIB groups. The invention also provides a solid electrolytic capacitor including the composite cathode foil.
    Type: Application
    Filed: December 26, 2008
    Publication date: May 27, 2010
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Jenn-Yeu HWANG, Jin-Bao WU, Li-Duan TSAI, Ming-Sheng LEU
  • Patent number: 7724501
    Abstract: An electrolytic capacitor having a low impedance characteristic, having a high withstand voltage characteristic of 100V class, wherein the electrolytic capacitor provides an excellent high temperature life characteristic and an excellent leakage characteristic. The electrolyte solution containing the aluminum tetrafluoride salt is used. The electrolytic capacitor of the present invention has a low impedance characteristic, a high withstand voltage characteristic, and an excellent high temperature life characteristic. Moreover, the aforementioned electrolyte solution is used, and a foil showing noble potential at least in the electrolyte solution than the electrode potential of the cathode tab, or a cathode electrode foil subjected to chemical treatment is used as the cathode electrode foil, so as to obtain an excellent leakage characteristic.
    Type: Grant
    Filed: July 26, 2007
    Date of Patent: May 25, 2010
    Assignees: Nippon Chemi-Con Corporation, Mitsubishi Chemical Corporation
    Inventors: Masahi Ozawa, Masayuki Takeda, Makoto Ue
  • Patent number: 7706131
    Abstract: A solid electrolytic capacitor (A) includes a first porous sintered body (1A) made of valve metal, anode conduction members (21A, 21B) electrically connected to the first porous sintered body (1A), surface-mounting anode terminals (3A, 3B) electrically connected to the anode conduction members (21A, 21B), surface-mounting cathode terminals, and a second porous sintered body (1B) made of valve metal and intervening between the first porous sintered body (1A) and the anode conduction members (21A, 21B).
    Type: Grant
    Filed: November 25, 2005
    Date of Patent: April 27, 2010
    Assignee: Rohm Co., Ltd.
    Inventor: Chojiro Kuriyama
  • Patent number: 7706132
    Abstract: A solid electrolytic capacitor includes a negative terminal, first to fourth capacitor elements coupled to the negative terminal, first and second positive terminals connected to the first to fourth capacitor elements, and a package resin covering the first to fourth capacitor elements. Each of the first to fourth capacitor elements has a first end and a second end opposite to the first end, and each of the first to fourth capacitor elements includes a negative electrode provided at the first end and a positive electrode provided at the second end. The first to fourth capacitor elements are stacked in this order. The positive electrodes of the first and fourth capacitor elements extend in a first direction from the respective negative electrodes of the first and fourth capacitor elements. The positive electrodes of the second and third capacitor elements extend in a second direction, opposite to the first direction, from the respective negative electrodes of the second and third capacitor elements.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: April 27, 2010
    Assignee: Panasonic Corporation
    Inventors: Kazuo Kawahito, Minoru Oomori, Junichi Kurita, Masatoshi Tasei, Masato Ozawa
  • Patent number: 7697267
    Abstract: The present invention relates to a capacitor having high capacitance, low ESR (equivalent series resistance) in a high-frequency region and low leakage current, including a composite oxide film obtained by reaction of an oxide film obtained by subjecting the surface of the substrate comprising valve-acting metal element to electrolytic oxidation with a solution in which metal ion and an organic base are dissolved and by subsequently sintering the reactant, a solid electrolyte formed on the composite oxide film and a conductor layer formed thereon; a method for producing the same and electronic devices using the same.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: April 13, 2010
    Assignee: Showa Denko K.K.
    Inventors: Hideki Oohata, Akihiko Shirakawa
  • Patent number: 7697266
    Abstract: A conductive paste for a solid electrolytic capacitor electrode contains an electroconductive powder having a mean particle size of no more than 1 ?m and at least 90% thereof having a particle size of at least 0.3 ?m; an organic binder; and a solvent.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: April 13, 2010
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Toshiaki Ogiwara
  • Publication number: 20100073849
    Abstract: The solid electrolytic capacitor according to the present invention comprises a capacitor element including an anode section, a cathode section, and a dielectric oxide film provided between the anode section and the cathode section. The solid electrolytic capacitor further comprises an anode lead frame connected to the anode section, a cathode lead frame connected to the cathode section, and an exterior resin covering the capacitor element and a part of the anode lead frame and cathode lead frame respectively. The anode section comprises an anode body including a sintered body of a valve action metal, and an average particle diameter of particles of the valve action metal of the anode body is 0.43 ?m or smaller.
    Type: Application
    Filed: September 21, 2009
    Publication date: March 25, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kenichiro Matsuzaki, Taro Matsuo, Kiyotaka Ito
  • Patent number: 7683109
    Abstract: A conductive composition comprises a ? conjugated conductive polymer, a dopant composed of polyanion, and at least one crosslinking site forming compound selected from (a) compounds having a glycidyl group and (b) compounds having a hydroxyl group and one selected from the group consisting of allyl, vinyl ether, methacryl, acryl methacrylamide, and acrylamide groups. An antistatic coating material comprises a ? conjugated conductive polymer, polyanion, at least one crosslinking site forming compound selected form the above (a) and (b), and a solvent. An antistatic coating is formed by applying the above-mentioned antistatic coating material. In a capacitor comprising an anode composed of a valve metal porous body; a dielectric layer formed by oxidizing the suds of the anode; and a cathode formed on the dielectric layer, the cathode has a solid electrolyte layer formed by crosslinking complexes of a ? conjugated conductive polymer and a dopant composed of a polyanion.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: March 23, 2010
    Assignee: Shin-Etsu Polymer Co., Ltd.
    Inventors: Kazuyoshi Yoshida, Tailu Ning, Yasushi Masahiro
  • Patent number: 7684171
    Abstract: A capacitor cell for use in medical devices, comprising: an anode substrate; a dielectric layer, formed on the anode substrate, including at least two valve metal oxides; a cathode separated from the anode substrate; and an electrolyte operatively associated with the anode substrate and the cathode.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: March 23, 2010
    Assignee: Medtronic, Inc.
    Inventors: Anthony W. Rorvick, Joachim Hossick-Schott, John D. Norton
  • Patent number: 7679885
    Abstract: Tantalum powder capable of providing a small-sized tantalum electrolytic capacitor while maintaining capacity is described. Tantalum powder in the present invention can be characterized in that the CV value is from 200,000 to 800,000 ?FV/g, when measured by the following measuring method. Pellets are produced by forming tantalum powder such that the density is 4.5 g/cm3, then the pellets are chemically converted in a phosphoric acid aqueous solution of concentration 0.1 vol. % at a voltage of 6V and a current of 90 mA/g, and the chemically converted pellets are used as measuring samples to measure the CV value in a sulfuric acid aqueous solution of concentration 30.5 vol. % at a temperature of 25° C. under a frequency of 120 Hz and a voltage of 1.5V.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: March 16, 2010
    Assignee: Cabot Corporation
    Inventors: Yujiro Mizusaki, Hitoshi Iijima, Yoshikazu Noguchi
  • Patent number: 7675737
    Abstract: The present invention provides electrolytes for use in electronic devices at temperature below ?50° C. consisting of a mixture, eutectic or tereutectic of at least two low viscosity aprotic solvents, acetonitrile, and a mixture of conductive salts having a molecular weight up to 240.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: March 9, 2010
    Assignee: Lithdyne LLC
    Inventors: W. Novis Smith, Joel R. McCloskey
  • Patent number: 7675736
    Abstract: A solid electrolytic capacitor including: an anode containing a valve metal or its alloy; a dielectric layer provided on the surface of the anodic; a cathode provided on the surface of the dielectric layer; and an outer package resin covering the anode, the dielectric layer and the cathode, wherein a glass transition temperature (Tgb) of the outer package resin is a temperature ranging from 0.50 to 0.90 times a maximum glass transition temperature (Tga) which is a maximum value of glass transition temperatures exhibited by the outer package resin after each heat treatment at variable temperatures of every 10° C. from 50° C. to 200° C. (treatment time: 5 hours) which is performed on the outer package resin before a curing process.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: March 9, 2010
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Takashi Umemoto, Hiroshi Nonoue
  • Patent number: 7663865
    Abstract: Electrolytic capacitors are provided having an airtight housing, electrodes immersed in an electrolytic solution, electrical contacts connected to the electrodes, and a device for sorption of harmful substances. The device is made of a multilayer polymeric sheet (10), which is formed of an inner layer (12) of polymeric material, containing particles of one or more getter materials (11) for sorption of the harmful substances, and at least one protective layer (13) of a polymeric material impermeable to the electrolyte. All of the polymeric materials are permeable to the harmful substances.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: February 16, 2010
    Assignee: Saes Getters S.p.A.
    Inventors: Luca Toia, Marco Amiotti
  • Publication number: 20100033906
    Abstract: The present invention provides a conductive polymer suspension for providing a conductive polymer material having a high conductivity and a method for producing the same, and in particular, a solid electrolytic capacitor having a low ESR and a method for producing the same. The conductive polymer suspension can be is produced by: synthesizing a conductive polymer by chemical oxidative polymerization of a monomer giving the conductive polymer by using an oxidant in an aqueous solvent containing a dopant consisting of a low-molecular organic acid or a salt thereof, or a polyacid having a weight average molecular weight of less than 2,000 or a salt thereof.
    Type: Application
    Filed: July 28, 2009
    Publication date: February 11, 2010
    Applicant: NEC Tokin Corporation
    Inventors: Tomoki NOBUTA, Ryuta KOBAYAKAWA, Naoki TAKAHASHI, Yasuhisa SUGAWARA, Satoshi SUZUKI, Toshihiko NISHIYAMA