Patents by Inventor Junji Nakajima

Junji Nakajima 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: 7754377
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: July 13, 2010
    Assignee: Panasonic Corporation
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Patent number: 7713464
    Abstract: The invention provides a multilayer container that comprises a polyglycolic acid layer and a thermoplastic polyester resin layer and is much improved in terms of gas barrier properties, heat resistance, moldability, transparency and durability, and its production process. Polyglycolic acid is used as a gas barrier resin. At the body and bottom, the thermoplastic polyester resin forms an inner and an outer layer, and an intermediate layer comprising at least one polyglycolic acid layer is embedded in the thermoplastic polyester resin layer. The opening end of the container is formed of a thermoplastic polyester resin layer alone, and the body is biaxially oriented. The multilayer container has heat resistance enough to stand up to hot-filling at 93° C. for 20 seconds.
    Type: Grant
    Filed: November 1, 2002
    Date of Patent: May 11, 2010
    Assignee: Kureha Corporation
    Inventors: Junji Nakajima, Takafumi Kato, Yoshihiro Matsukura
  • Publication number: 20100074069
    Abstract: There are provided an optical disk device and tilt correction processing method for performing recording/reproduction by rapidly acquiring an optimal tilt correction value for an optical disk having a plurality of recording/reproducing layers. In an optical disk device capable of recording or reproducing information by irradiating a laser beam to each of a plurality of recording/reproducing layers of an optical disk, the tilt value is stepwise set within a predetermined range at a predetermined radius position of the recording/reproducing layer located at the farthest distance from the laser beam irradiation side so that an optimal tilt correction value can be obtained from the quadratic function by the method of least squares of the jitter or the like obtained from the disk. By applying the optimal tilt value obtained to the other recording/reproducing layer, it is possible to start recording or reproduction in a short time.
    Type: Application
    Filed: December 2, 2009
    Publication date: March 25, 2010
    Applicant: Hitachi, Ltd.
    Inventors: Koji Iijima, Motoyuki Suzuki, Junji Nakajima
  • Patent number: 7670717
    Abstract: To provide a non-aqueous secondary battery having a capacity as high as that of a conventional battery using a conventional resin separator and achieving excellent overcharge characteristics and excellent resistance to external short-circuit, a combined electrode plate for a spirally-wound electrode group for a non-aqueous secondary battery including a current collector, an active material layer carried on the current collector and a multi-layer porous membrane carried on the active material layer is used. The multi-layer porous membrane includes a first porous membrane and a second porous membrane. The first porous membrane contains metal oxide particles and a first binder. The second porous membrane contains resin particles and a second binder. The thickness of the multi-layer porous membrane is preferably 15 to 25 ?m.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: March 2, 2010
    Assignee: Panasonic Corporation
    Inventors: Tsumoru Ohata, Junji Nakajima
  • Patent number: 7643392
    Abstract: There are provided an optical disk device and tilt correction processing method for performing recording/reproduction by rapidly acquiring an optimal tilt correction value for an optical disk having a plurality of recording/reproducing layers. In an optical disk device capable of recording or reproducing information by irradiating a laser beam to each of a plurality of recording/reproducing layers of an optical disk, the tilt value is stepwise set within a predetermined range at a predetermined radius position of the recording/reproducing layer located at the farthest distance from the laser beam irradiation side so that an optimal tilt correction value can be obtained from the quadratic function by the method of least squares of the jitter or the like obtained from the disk. By applying the optimal tilt value obtained to the other recording/reproducing layer, it is possible to start recording or reproduction in a short time.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: January 5, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Koji Iijima, Motoyuki Suzuki, Junji Nakajima
  • Patent number: 7488557
    Abstract: The present invention relates to a lead-acid battery Comprising a positive and a negative electrode, each having a current collector comprising an expanded grid, characterized in that at least one of the positive electrode and the negative electrode contains an organic binder in an active material layer at an edge portion thereof. This makes it possible to suppress an internal short circuit resulting from the separation or abnormal growth of an active material due to repeated charge/discharge, thereby remarkably prolonging the cycle life of a lead-acid battery.
    Type: Grant
    Filed: December 24, 2002
    Date of Patent: February 10, 2009
    Assignee: Panasonic Corporation
    Inventors: Akihiro Maeda, Naoto Hoshihara, Junji Nakajima
  • Publication number: 20080274411
    Abstract: A lithium ion secondary battery including: a positive electrode including a lithium composite oxide; a negative electrode capable of charging and discharging lithium ion; a non-aqueous liquid electrolyte; and a solid electrolyte layer interposed between the positive electrode and the negative electrode, wherein the solid electrolyte layer includes solid electrolyte particles and a binder. The solid electrolyte layer may include an inorganic oxide filler. The solid electrolyte particles is, for example, at least one selected from the group consisting of LiCl—Li2O—P2O5, LiTi2(PO4)3—AlPO4, LiI—Li2S—SiS4, LiI—Li2S—B2S3, LiI—Li2S—P2O5 and Li3N.
    Type: Application
    Filed: May 13, 2005
    Publication date: November 6, 2008
    Inventors: Junji Nakajima, Tsumoru Ohata, Toshihiro Inoue
  • Publication number: 20080274399
    Abstract: A secondary battery includes: a positive electrode; a negative electrode; a porous electron-insulating layer adhered to a surface of at least one selected from the group consisting of the positive electrode and the negative electrode; and an electrolyte. The porous electron-insulating layer comprises a particulate filler and a resin binder, and the particulate filler comprises an indefinite-shape particle comprising a plurality of primary particles that are joined to one another. A neck is preferably formed between the primary particles. Since the porous electron-insulating layer has high porosity, it is possible to obtain a secondary battery that exhibits excellent low-temperature characteristics, which are particularly important in actual use, and that is capable of discharging at a large current.
    Type: Application
    Filed: June 20, 2008
    Publication date: November 6, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO. LTD.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Shigeo Ikuta, Yusuke Fukumoto
  • Publication number: 20080267045
    Abstract: A laser driving method and an optical disc recording/reproducing apparatus are provided which are arranged to stably write data on an optical disc. The laser driving method is applied to a laser driving circuit arranged to have a laser diode for emitting a laser beam onto an optical disc, a transistor connected in series with the laser diode and a variable power supply for applying a DC voltage to the laser diode. The laser driving method includes the steps of causing the laser diode to emit a laser beam on trial before starting recording of data on the optical disc, detecting an operating voltage applied onto a contact between the laser diode and the transistor, and adjusting a DC voltage of the variable power supply based on the operating voltage.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 30, 2008
    Inventors: Junji Nakajima, Kazuhiro Ikeda, Nobuo Nakai
  • Patent number: 7396612
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: July 8, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20080049577
    Abstract: There are provided an optical disk device and tilt correction processing method for performing recording/reproduction by rapidly acquiring an optimal tilt correction value for an optical disk having a plurality of recording/reproducing layers. In an optical disk device capable of recording or reproducing information by irradiating a laser beam to each of a plurality of recording/reproducing layers of an optical disk, the tilt value is stepwise set within a predetermined range at a predetermined radius position of the recording/reproducing layer located at the farthest distance from the laser beam irradiation side so that an optimal tilt correction value can be obtained from the quadratic function by the method of least squares of the jitter or the like obtained from the disk. By applying the optimal tilt value obtained to the other recording/reproducing layer, it is possible to start recording or reproduction in a short time.
    Type: Application
    Filed: October 12, 2007
    Publication date: February 28, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Koji Iijima, Motoyuki Suzuki, Junji Nakajima
  • Publication number: 20080044733
    Abstract: A lithium ion secondary battery includes: a positive electrode including a positive electrode substrate, and a positive electrode material mixture layer carried on the positive electrode substrate; a negative electrode including a negative electrode substrate, and a negative electrode material mixture layer carried on the negative electrode substrate; a separator; a non-aqueous electrolyte including a non-aqueous solvent that contains a carbonic ester, and a solute dissolved in the non-aqueous solvent; and a porous film bonded to a surface of at least one of the positive electrode and the negative electrode. The porous film includes an inorganic filler and a film binder, and the solubility parameter of the film binder is different from the solubility parameter of the non-aqueous solvent by 1 or more.
    Type: Application
    Filed: May 13, 2005
    Publication date: February 21, 2008
    Inventors: Tsumoru Ohata, Junji Nakajima, Kaoru Inoue, Eitaro Nakamura
  • Publication number: 20080038639
    Abstract: A method for producing a lithium ion secondary battery includes the steps of: forming a positive electrode mixture layer on a positive electrode substrate to obtain a positive electrode; forming a negative electrode mixture layer on a negative electrode substrate to obtain a negative electrode; forming an electronically insulating porous film that is bonded to a surface of at least one of the positive electrode and the negative electrode; interposing a separator between the positive electrode and the negative electrode to form an electrode plate assembly; and impregnating the electrode plate assembly with a non-aqueous electrolyte. The step of forming a porous film includes the steps of: preparing a porous film paste that contains a film binder comprising a thermo-cross-linkable resin and a particulate filler; and applying the porous film paste onto a surface of at least one of the positive electrode and the negative electrode and heating the resultant applied film.
    Type: Application
    Filed: April 19, 2005
    Publication date: February 14, 2008
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Shigeo Ikuta, Akiko Fujino, Eitaro Nakamura
  • Patent number: 7295497
    Abstract: There are provided an optical disk device and tilt correction processing method for performing recording/reproduction by rapidly acquiring an optimal tilt correction value for an optical disk having a plurality of recording/reproducing layers. In an optical disk device capable of recording or reproducing information by irradiating a laser beam to each of a plurality of recording/reproducing layers of an optical disk, the tilt value is stepwise set within a predetermined range at a predetermined radius position of the recording/reproducing layer located at the farthest distance from the laser beam irradiation side so that an optimal tilt correction value can be obtained from the quadratic function by the method of least squares of the jitter or the like obtained from the disk. By applying the optimal tilt value obtained to the other recording/reproducing layer, it is possible to start recording or reproduction in a short time.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: November 13, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Koji Iljima, Motoyuki Suzuki, Junji Nakajima
  • Publication number: 20070202404
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Application
    Filed: April 26, 2007
    Publication date: August 30, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20070196737
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Application
    Filed: April 26, 2007
    Publication date: August 23, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20070196738
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Application
    Filed: April 26, 2007
    Publication date: August 23, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20070042270
    Abstract: A secondary battery includes: a positive electrode; a negative electrode; a porous electron-insulating layer adhered to a surface of at least one selected from the group consisting of the positive electrode and the negative electrode; and an electrolyte. The porous electron-insulating layer comprises a particulate filler and a resin binder, and the particulate filler comprises an indefinite-shape particle comprising a plurality of primary particles that are joined to one another. A neck is preferably formed between the primary particles. Since the porous electron-insulating layer has high porosity, it is possible to obtain a secondary battery that exhibits excellent low-temperature characteristics, which are particularly important in actual use, and that is capable of discharging at a large current.
    Type: Application
    Filed: February 7, 2005
    Publication date: February 22, 2007
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Shigeo Ikuta, Yusuke Fukumoto
  • Patent number: 7115339
    Abstract: A lithium ion secondary battery comprising: a positive electrode, a negative electrode, a separator interposed between the positive and negative electrodes, and an electrolyte prepared by dissolving a lithium salt in a non-aqueous solvent, wherein the separator comprises a porous film layer containing basic solid particles and a composite binder, the porous film layer is adhered to at least one surface of at least one of the positive and negative electrodes, the composite binder comprises a primary binder and a secondary binder, the primary binder comprises polyether sulfone and the secondary binder comprises polyvinylpyrrolidone.
    Type: Grant
    Filed: February 9, 2004
    Date of Patent: October 3, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Junji Nakajima, Tsumoru Ohata, Takashi Takano, Kohei Suzuki, Tetsuya Hayashi
  • Publication number: 20060216608
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Application
    Filed: July 26, 2004
    Publication date: September 28, 2006
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Suzuki Kohei, Kouji Nishida, Masao Fukunaga, Akiko Fujino