Patents by Inventor Katsuhiro Hayashida

Katsuhiro Hayashida 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).

  • Patent number: 6462424
    Abstract: A method of producing a semiconductor device includes a device body producing step, electrically coupling leads and a semiconductor chip, and producing a device body by encapsulating the semiconductor chip by a resin package so that portions of the leads are exposed from the resin package, a honing step, carrying out a honing process using a polishing solution at least with respect to a resin flash adhered on the portions of the leads exposed from the resin package, an etching step, removing an unwanted stacked layer structure formed on the leads by carrying out an etching process after the honing step, and a plating step, carrying out a plating process with respect to the leads after the etching step to form a plated layer made of a soft bonding material. The honing step removes a portion of the unwanted stacked layer structure in addition to the resin flash.
    Type: Grant
    Filed: November 6, 2000
    Date of Patent: October 8, 2002
    Assignee: Fujitsu Limited
    Inventors: Masaaki Seki, Katsuhiro Hayashida, Mitsutaka Sato, Toshio Hamano
  • Patent number: 6433418
    Abstract: A semiconductor device includes a resin package in which a semiconductor chip is sealed, the resin package having a first surface and a second surface opposite to the first surface; a plurality of leads having inner lead parts connected to the semiconductor chip and outer lead parts extending outside the resin package, the outer lead parts being bent along the shape of the resin package so as to form first terminal parts on the second surface and second terminal parts on the first surface; connection means electrically connecting the semiconductor chip and the leads; and a positioning mechanism provided either on the leads or on the resin package, which positions the outer lead parts by engaging a part of the outer lead parts to the resin package. Further, at least one of the leads and/or connection means is cut so as to electrically disconnect the semiconductor chip and the one of the leads and/or connection elements.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: August 13, 2002
    Assignee: Fujitsu Limited
    Inventors: Tetsuya Fujisawa, Mitsutaka Sato, Seiichi Orimo, Kazuhiko Mitobe, Masaaki Seki, Masaki Waki, Toshio Hamano, Katsuhiro Hayashida, Yoshitsugu Katoh, Hiroshi Inoue
  • Patent number: 6165819
    Abstract: A method of producing a semiconductor device includes a device body producing step, electrically coupling leads and a semiconductor chip, and producing a device body by encapsulating the semiconductor chip by a resin package so that portions of the leads are exposed from the resin package, a honing step, carrying out a honing process using a polishing solution at least with respect to a resin flash adhered on the portions of the leads exposed from the resin package, an etching step, removing an unwanted stacked layer structure formed on the leads by carrying out an etching process after the honing step, and a plating step, carrying out a plating process with respect to the leads after the etching step to form a plated layer made of a soft bonding material. The honing step removes a portion of the unwanted stacked layer structure in addition to the resin flash.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: December 26, 2000
    Assignee: Fujitsu Limited
    Inventors: Masaaki Seki, Katsuhiro Hayashida, Mitsutaka Sato, Toshio Hamano
  • Patent number: 6094356
    Abstract: A semiconductor device including a semiconductor chip, connection parts arranged along one end of the semiconductor chip, and external connection terminals connected to the connection parts.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: July 25, 2000
    Assignee: Fujitsu Limited
    Inventors: Tetsuya Fujisawa, Mitsutaka Sato, Kazuhiko Mitobe, Katsuhiro Hayashida, Masaaki Seki, Seiichi Orimo, Toshio Hamano
  • Patent number: 6060768
    Abstract: A semiconductor device includes a semiconductor chip in which electrode pads are formed with a first pitch, leads electrically connected with the electrode pads through lines, and sealing plastic sealing the semiconductor chip. In the semiconductor device, projections used for external connection ports are formed in the leads with a second pitch. The sealing plastic seals the lines connecting the electrode pads and the leads, but the projections are exposed from the sealing plastic.
    Type: Grant
    Filed: September 23, 1997
    Date of Patent: May 9, 2000
    Assignee: Fujitsu Limited
    Inventors: Katsuhiro Hayashida, Mitsutaka Sato, Tadashi Uno, Tetsuya Fujisawa, Masaki Waki
  • Patent number: 5984699
    Abstract: A lead frame is formed by subjecting a frame base to a forming process, a semiconductor chip is fixed on leads formed in the lead frame and wires are provided in the semiconductor chip, and then a package which accommodates the semiconductor chip is formed; a non-conductive adhesive being provided, before the forming process, on a position on the frame base in which the leads are formed, and unnecessary portions of the frame base and the non-conductive adhesive being removed in the forming process so that the leads having a predetermined configuration and provided with the non-conductive adhesive are formed.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: November 16, 1999
    Assignee: Fujitsu Limited
    Inventors: Masaki Waki, Katsuhiro Hayashida, Mitsutaka Sato, Tadashi Uno, Kazuhiko Mitobe, Tetsuya Fujisawa
  • Patent number: 5801439
    Abstract: A semiconductor device includes a semiconductor element, a package sealing the semiconductor element, and leads for passing signals between the semiconductor element and an external device. Each of the leads has an inner-lead part sealed within the package and connected with the semiconductor element, and an outer-lead part which extends outward from the package toward a top of the package, and is to be connected to the external device. The outer-lead part includes a first-port part at a lower side of the package, and a second-port part at an upper side of the package.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: September 1, 1998
    Assignee: Fujitsu Limited
    Inventors: Tetsuya Fujisawa, Mitsutaka Sato, Junichi Kasai, Masataka Mizukoshi, Kosuke Otokita, Hiroshi Yoshimura, Katsuhiro Hayashida, Akira Takashima, Masahiko Ishiguri, Michio Sono
  • Patent number: 5786985
    Abstract: A semiconductor device is adapted to be mounted on a circuit substrate in an approximate vertical position. The semiconductor device includes a semiconductor chip, a stage having a first surface and a second surface opposite to the first surface, where the semiconductor chip is mounted on the first surface, a resin package encapsulating the semiconductor chip, where the resin package has upper and lower surfaces and side surfaces, a plurality of leads respectively having one end electrically connected to the semiconductor chip and another end extending downwardly from the lower surface of the resin package, and an upper extension, provided on the stage, extending upwardly from the upper surface of the resin package.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: July 28, 1998
    Assignee: Fujitsu Limited
    Inventors: Norio Taniguchi, Junichi Kasai, Kazuto Tsuji, Michio Sono, Masanori Yoshimoto, Katsuhiro Hayashida, Mitsutaka Sato, Hiroshi Yoshimura, Tadashi Uno, Kosuke Otokita, Tetsuya Fujisawa
  • Patent number: 5760471
    Abstract: A semiconductor device including a semiconductor element, and leads connected with the semiconductor element. Each of the leads includes an outer lead part for being connected externally. The semiconductor device further includes a plastic package sealing the semiconductor element and the leads. In the semiconductor device, the outer lead part is exposed to the outside of a side face of the plastic package, and the plastic package is mounted on any base in a standing form by the side face contacting the base.
    Type: Grant
    Filed: February 3, 1997
    Date of Patent: June 2, 1998
    Assignee: Fujitsu Limited
    Inventors: Tetsuya Fujisawa, Mitsutaka Sato, Junichi Kasai, Masataka Mizukoshi, Kousuke Otokita, Hiroshi Yoshimura, Katsuhiro Hayashida, Akira Takashima, Masahiko Ishiguri, Michio Sono