Patents by Inventor Akira Yajima

Akira Yajima 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: 20120184646
    Abstract: A semiconductor-encapsulating liquid epoxy resin composition comprises (A) a liquid epoxy resin, (B) an aromatic amine curing agent, and (C) an inorganic filler comprising an inorganic filler A which is a silica having an average particle size of 0.1 to 3 ?m, and an inorganic filler B which is an amorphous nanosilica having an average particle size of 5 to 70 nm and having its surface treated with a coupling agent represented by the following formula (1) and/or (2): wherein n is an integer of 1 to 5, and m is 1 or 2.
    Type: Application
    Filed: January 13, 2012
    Publication date: July 19, 2012
    Applicant: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kazuaki SUMITA, Yasuo KIMURA, Tatsuya UEHARA, Akira YAJIMA
  • Publication number: 20120032329
    Abstract: In semiconductor integrated circuit devices for vehicle use, an aluminum pad on a semiconductor chip and an external device are coupled to each other by wire bonding using a gold wire for the convenience of mounting. Such a semiconductor integrated circuit device, however, causes a connection failure due to the interaction between aluminum and gold in use for a long time at a relatively high temperature (about 150 degrees C.). A semiconductor integrated circuit device can include a semiconductor chip as a part of the device, an electrolytic gold plated surface film (gold-based metal plated film) provided over an aluminum-based bonding pad on a semiconductor chip via a barrier metal film, and a gold bonding wire (gold-based bonding wire) for interconnection between the plated surface film and an external lead provided over a wiring board (wiring substrate).
    Type: Application
    Filed: September 12, 2011
    Publication date: February 9, 2012
    Inventors: HIROMI SHIGIHARA, HIROSHI TSUKAMOTO, AKIRA YAJIMA
  • Publication number: 20110304049
    Abstract: To suppress peeling of an Au pad for external coupling provided in a rewiring containing Cu as a main component. On the surface of a rewiring including a two-layer film in which a first Ni film is laminated on the top of a Cu film, a pad to which a wire is coupled is formed. The pad includes a two-layer film in which an Au film is laminated on the top of a second Ni film and formed integrally so as to cover the top surface and the side surface of the rewiring. Due to this, the area of contact between the rewiring and the pad increases, and therefore, the pad becomes difficult to be peeled off from the rewiring.
    Type: Application
    Filed: June 14, 2011
    Publication date: December 15, 2011
    Inventors: Hiromi SHIGIHARA, Akira Yajima, Hisao Shigihara, Hiroshi Tsukamoto
  • Patent number: 8063489
    Abstract: In semiconductor integrated circuit devices for vehicle use or the like, in general, an aluminum pad on a semiconductor chip and an external device are coupled to each other by wire bonding or the like using a gold wire and the like for the convenience of mounting. Such a semiconductor integrated circuit device, however, causes a connection failure due to the interaction between aluminum and gold in use for a long time at a relatively high temperature (about 150 degrees C.).
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: November 22, 2011
    Assignee: Renesas Electronics Corporation
    Inventors: Hiromi Shigihara, Hiroshi Tsukamoto, Akira Yajima
  • Publication number: 20110117465
    Abstract: Disclosed is a fuel cell (1) comprising a cell composition part (10) composed of an electrolyte membrane (17) sandwiched between an anode (fuel electrode) (13) and a cathode (air electrode) (16), and a fuel supply mechanism (40) disposed on the anode (fuel electrode) side of the cell composition part (10) and which supplies a fuel to the anode (fuel electrode) (13). The fuel cell (1) further comprises a moisture retaining layer (50) which is disposed on the cathode (air electrode) of the cell composition part (10) and which is impregnated with the water generated at the cathode (air electrode) (16), and a heat-radiating member (70) having an externally protruding heat-radiating portion (71) for releasing the heat generated by the cell composition part (10).
    Type: Application
    Filed: November 18, 2010
    Publication date: May 19, 2011
    Inventors: Akira Yajima, Shinichi Kanbayashi, Nobuyasu Negishi, Risa Aoki, Genta Oomichi
  • Publication number: 20100285389
    Abstract: The present invention relates to a fuel cell including a plurality of unit membrane electrode assemblies having an electrolyte membrane sandwiched by fuel electrodes and air electrodes. In recent years, attempts have been made to use fuel cells as power sources of portable electronic devices, and if the fuel cell can be made compact, it becomes a remarkably advantageous power supply system for portable electronic devices. Generally, in the fuel cell, the plural unit membrane electrode assemblies are electrically connected in series, but the serial connection of the unit membrane electrode assemblies different in output has a problem such as the deterioration due to polarity reversal occurring in the unit membrane electrode assembly with a low output.
    Type: Application
    Filed: September 24, 2008
    Publication date: November 11, 2010
    Inventors: Akira Yajima, Yoshie Ozeki, Nobuyasu Negishi, Koichi Kawamura, Takashi Shimoyamada, Motoi Goto, Kenichi Takahashi, Naoki Iwamura
  • Publication number: 20100261092
    Abstract: A fuel cell includes a membrane electrode assembly includes an anode, a cathode and an electrolyte membrane interposed between the anode and the cathode, an anode conductive layer which is in contact with the anode, a cathode conductive layer which is in contact with the cathode, and a fuel supply mechanism which is disposed on the anode side of the membrane electrode assembly to supply fuel to the anode. The membrane electrode assembly includes a shape formed convexly toward the anode side in a separate condition.
    Type: Application
    Filed: June 23, 2010
    Publication date: October 14, 2010
    Inventor: Akira YAJIMA
  • Publication number: 20100255389
    Abstract: A fuel cell includes a membrane electrode assembly includes a fuel electrode, an air electrode and an electrolyte membrane interposed between the fuel electrode and the air electrode, a fuel supply mechanism disposed on the air electrode side of the membrane electrode assembly to supply fuel to the fuel electrode, and a humidification layer disposed on the air electrode side of the membrane electrode assembly to be impregnated with water produced in the air electrode. The humidification layer include a first humidification section disposed opposite to a high-temperature area of an air electrode and a second humidification section disposed opposite to a low-temperature area of the air electrode when generating electricity. The second humidification section is so configured that water vapor is released into air therefrom more easily than from the first humidification section in the membrane electrode assembly.
    Type: Application
    Filed: June 16, 2010
    Publication date: October 7, 2010
    Inventors: Akira Yajima, Asako Satoh, Hirofumi Kan, Risa Aoki, Yuichi Yoshida
  • Publication number: 20100233572
    Abstract: The present invention relates to a fuel cell including: a membrane electrode assembly 10 having an electrolyte membrane 17 sandwiched by a fuel electrode 13 and an air electrode 16; a fuel supply part 43 disposed on the fuel electrode side of the membrane electrode assembly to supply a fuel to the fuel electrode 13; a fuel storage part 41 storing the fuel; and a fuel channel 44 leading the fuel stored in the fuel storage part to the fuel supply part. Since a fuel cell can generate electricity for a long time by being continuously supplied with a fuel, the fuel cell serves as a system advantageous as a power source of a portable electronic device such as a portable phone if it can be made compact.
    Type: Application
    Filed: September 2, 2008
    Publication date: September 16, 2010
    Inventors: Akira Yajima, Jun Momma
  • Publication number: 20100181650
    Abstract: With a general wafer level package process, in order to prevent corrosion of an aluminum type pad electrode in a scribe region in a plating process, the pad electrode is covered with a pad protective resin film at the same layer as an organic type protective film in a product region. However, this makes it impossible to perform the probe test on the pad electrode in the scribe region after rewiring formation. The present invention provides a method for manufacturing a semiconductor integrated circuit device of a wafer level package system. The organic type protective films in the chip regions and the scribe region are mutually combined to form an integral film pattern. In a pelletization step, the surface layer portion including the organic type protective film at the central part of the scribe region is first removed by laser grooving, to form a large-width groove. Then, a dicing processing of the central part in this groove results in separation into the chip regions.
    Type: Application
    Filed: December 30, 2009
    Publication date: July 22, 2010
    Inventors: Hisao SHIGIHARA, Hiromi Shigihara, Akira Yajima
  • Patent number: 7749640
    Abstract: A fuel cell comprising a cathode catalyst layer, an anode catalyst layer including a conductive perfluoro-binder having a micellar structure formed by outwardly orienting hydrophilic groups and inwardly orienting hydrophobic (lipophilic) groups, and a proton conductive membrane provided between the cathode catalyst layer and the anode catalyst layer.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: July 6, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hirofumi Kan, Asako Satoh, Akira Yajima, Yumiko Takizawa, Hiroyuki Shiroki
  • Publication number: 20100133688
    Abstract: In semiconductor integrated circuit devices for vehicle use or the like, in general, an aluminum pad on a semiconductor chip and an external device are coupled to each other by wire bonding or the like using a gold wire and the like for the convenience of mounting. Such a semiconductor integrated circuit device, however, causes a connection failure due to the interaction between aluminum and gold in use for a long time at a relatively high temperature (about 150 degrees C.).
    Type: Application
    Filed: December 1, 2009
    Publication date: June 3, 2010
    Inventors: Hiromi Shigihara, Hiroshi Tsukamoto, Akira Yajima
  • Publication number: 20100104907
    Abstract: In an electronic device, state detection elements are arranged at various locations of a fuel cell system supplies an electric power to a phone unit, the state detection elements detect states of the fuel cell system at the locations. A cell state detection unit detects an operating state of the fuel cell from an output signal of each of the state detection elements. A determination unit determines an operating mode to prompt action to be taken for the operating state of the fuel cell detected by the cell state detection unit. A content of the operating mode is displayed with an image of a character or a fictitious creature based on a determination by the determination unit.
    Type: Application
    Filed: December 31, 2009
    Publication date: April 29, 2010
    Inventors: Risa AOKI, Akira Yajima, Asako Satoh, Jun Momma, Yumiko Takizawa, Yuuichi Sato, Genta Oomichi, Hirofumi Kan, Nobuyasu Negishi, Mitsuru Furuichi, Yuichi Yoshida, Kiyoto Yoda, Hideo Oota
  • Patent number: 7642015
    Abstract: A nonaqueous electrolyte secondary battery includes an electrode group having a positive electrode and a negative electrode wound flatly by way of an interposed separator, a positive electrode tab electrically connected to the positive electrode, and projecting from a spiral winding surface of the electrode group, a negative electrode tab electrically connected to the negative electrode, and projecting from the spiral winding surface, and a nonaqueous electrolyte, wherein the nonaqueous solvent contains sultone compound including a ring having at least one double bond, and a distance between the positive electrode tab and the negative electrode tab is 6 mm to 18 mm.
    Type: Grant
    Filed: August 6, 2007
    Date of Patent: January 5, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shusuke Inada, Masahiro Sekino, Akira Yajima, Nao Shimura, Asako Satoh, Masayuki Oguchi, Hiroshi Kitayama
  • Patent number: 7638223
    Abstract: A fuel cell comprising a cathode catalyst layer, an anode catalyst layer including a conductive perfluoro-binder having a micellar structure formed by outwardly orienting hydrophobic (lipophilic) groups and inwardly orienting hydrophilic groups, and a proton conductive membrane provided between the cathode catalyst layer and the anode catalyst layer.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: December 29, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hirofumi Kan, Asako Satoh, Akira Yajima, Yumiko Takizawa, Hiroyuki Shiroki
  • Publication number: 20090315179
    Abstract: A semiconductor device having projection electrodes with a narrow pad pitch, and a method of forming such semiconductor device, are provided. On a semiconductor wafer, a polyimide film, which does not cover each of a plurality of lands, is prepared between the respective lands which adjoin each other among the plurality of lands on the main surface of the semiconductor wafer. A soldering paste material is applied by a printing method, via a mask for printing, on each of a plurality of lands after polyimide film formation, and a solder bump is formed by performing heat curing of the soldering paste material after removing the mask for printing. The solder bump can be provided without generating an electric short circuit between bumps even in the case of a narrow pad pitch.
    Type: Application
    Filed: August 26, 2009
    Publication date: December 24, 2009
    Inventors: Hiromi SHIGIHARA, Hisao Shigihara, Akira Yajima
  • Publication number: 20090317685
    Abstract: A fuel cell (10) which comprises a membrane electrode assembly (16) composed of a fuel electrode, an air electrode, and an electrolyte membrane (15) sandwiched between the fuel electrode and the air electrode; and an oxidant gas blocking mechanism (25) superposed on the air electrode side and capable of blocking an oxidant gas to be supplied to the air electrode. The oxidant gas blocking mechanism (25) comprises fixed plates and, sandwiched therebetween, a frame having a movable plate disposed therein.
    Type: Application
    Filed: November 27, 2006
    Publication date: December 24, 2009
    Inventors: Akira Yajima, Nobuyasu Negishi, Hiroyuki Hasebe, Koichi Kawamura
  • Publication number: 20090269653
    Abstract: A fuel cell comprising a cathode catalyst layer (2) containing a cathode catalyst particle and a proton conductive resin, an anode catalyst layer (3) and a proton conductive membrane (6) provided between the cathode catalyst layer (2) and the anode catalyst layer (3), wherein a content of the cathode catalyst particle in the cathode catalyst layer (2) is substantially the same on a first surface facing the proton conductive membrane (6) and on a second surface opposite to the first surface, and a content of the proton conductive resin in the cathode catalyst layer (2) is increased with an increase in distance from the second surface toward the first surface.
    Type: Application
    Filed: March 28, 2006
    Publication date: October 29, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira Yajima, Yumiko Takizawa, Asako Satoh, Hirofumi Kan
  • Publication number: 20090263688
    Abstract: A fuel cell (10) has a fuel electrode, an air electrode, an electrolyte film (15) held between the fuel electrode and the air electrode, a liquid fuel tank (21) for containing liquid fuel, and a gas-liquid separation film (22) provided between the liquid fuel tank (21) and the fuel electrode. The gas-liquid separation film (22) exchanges heat between water vapor diffused from the fuel cell and the liquid fuel (F) and allows a vaporized component of the liquid fuel (F) to pass to the fuel electrode side.
    Type: Application
    Filed: October 20, 2006
    Publication date: October 22, 2009
    Inventors: Akira Yajima, Yukinori Akamoto, Yuuichi Sato, Nobuyasu Negishi
  • Publication number: 20090191441
    Abstract: The fuel cell includes a membrane electrode assembly including a cathode catalyst layer, an anode catalyst layer and a proton conducting film provided between the cathode catalyst layer and the anode catalyst layer, a cathode conductive layer electrically connected to the cathode catalyst layer, an anode conductive layer electrically connected to the anode catalyst layer, a liquid fuel storage chamber which contains a liquid fuel, a gas-liquid separation film which selectively transmit a gasified component of the liquid fuel from the liquid fuel storage chamber to the anode catalyst layer, and a gasified fuel storage chamber formed at a section between the gas-liquid separation film and the anode conductive layer, and the distance L1 from the gas-liquid separation film to the anode conductive layer is set to 0 mm or more but 2 mm or less.
    Type: Application
    Filed: February 24, 2009
    Publication date: July 30, 2009
    Inventors: Yuichi YOSHIDA, Nobuyasu Negishi, Hideyuki Oozu, Akira Yajima, Yukinori Akamoto