Patents by Inventor Yousuke Ishikawa

Yousuke Ishikawa 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: 8723418
    Abstract: A starting light source for radiating the UV-light to a discharge chamber upon starting lighting of a high pressure discharge lamp includes a discharge tube for generating the UV-light by a starting voltage applied upon starting lighting the lamp, the discharge tube includes an internal electrode extended from a pinch seal portion formed at one end to a light-emitting portion thereof and an external electrode disposed close to or in contact with both of the light-emitting portion and the pinch seal portion, at least a portion of the external electrode disposed for the light-emitting portion includes a holder formed by bending fabrication of a metal sheet into such a shape of gripping and holding the discharge tube, and a terminal is formed to the holder for fixing and electrically connecting the external electrode to a conductor part having a polarity opposite to that of the internal electrode.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: May 13, 2014
    Assignee: Iwasaki Electric Co., Ltd.
    Inventors: Yosuke Kano, Nobuo Fukuda, Makoto Ohkahara, Yousuke Ishikawa, Sumio Uehara
  • Patent number: 8471472
    Abstract: Starting performance is improved by efficient UV-light irradiation, suppressing creeping discharge or atmospheric discharge at the outside of a glow discharge tube, and preventing cracks in a pinch seal portion even when an external force is exerted in the direction of bending a lead. In a discharge tube for emitting a UV-light, a light emitting chamber is formed on one side of a pinch seal portion for sealing an electrode assembly, and a lead protrusion port is formed on the opposite side thereof while pinching the seal portion, the lead protrusion port is formed as a sleeve having a predetermined gap relative to the lead, an external electrode disposed to the outside of the light emitting chamber includes a hold formed by bending fabrication of a metal plate.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: June 25, 2013
    Assignee: Iwasaki Electric Co., Ltd.
    Inventors: Yousuke Ishikawa, Nobuo Fukuda, Hirokazu Harasawa, Kouji Komata
  • Publication number: 20120181924
    Abstract: Starting performance is improved by efficient UV-light irradiation, suppressing creeping discharge or atmospheric discharge at the outside of a glow discharge tube, and preventing cracks in a pinch seal portion even when an external force is exerted in the direction of bending a lead. In a discharge tube for emitting a UV-light, a light emitting chamber is formed on one side of a pinch seal portion for sealing an electrode assembly, and a lead protrusion port is formed on the opposite side thereof while pinching the seal portion, the lead protrusion port is formed as a sleeve having a predetermined gap relative to the lead, an external electrode disposed to the outside of the light emitting chamber includes a hold formed by bending fabrication of a metal plate.
    Type: Application
    Filed: June 22, 2010
    Publication date: July 19, 2012
    Applicant: IWASAKI ELECTRIC CO., LTD.
    Inventors: Yousuke Ishikawa, Nobuo Fukuda, Hirokazu Harasawa, Kouji Komata
  • Publication number: 20120091875
    Abstract: A necessary and sufficient amount of a UV-light is radiated to a high pressure discharge lamp for enabling reliable improvement in the starting performance by a starting light source of a simple configuration not increasing the manufacturing cost.
    Type: Application
    Filed: April 27, 2010
    Publication date: April 19, 2012
    Applicant: IWASAKI ELECTRIC CO., LTD.
    Inventors: Yosuke Kano, Nobuo Fukuda, Makoto Ohkahara, Yousuke Ishikawa, Sumio Uehara
  • Patent number: 8154182
    Abstract: A light source apparatus is capable of reliably enhancing the starting performance of a high pressure discharge lamp even during hot state just after extinguishing the high pressure discharge lamp by radiating a necessary and sufficient amount of a UV-light into a discharge bulb of the lamp using an UV-enhancer of a simple constitution without increasing the manufacturing cost is provided. An UV-enhancer for radiating a UV-light to a discharge bulb for enhancing the starting performance of a high pressure discharge lamp upon starting lighting includes a discharge tube connected in parallel to a lighting circuit of the lamp, and an external electrode of the discharge tube is formed as a metal holder that holds the outer periphery of the discharge tube so as to oppose the end face of an electrode seal portion of the lamp inserted through a bottom hole in a concave reflector and secures the electrode seal portion to an electrode lead protruding from the end face thereof.
    Type: Grant
    Filed: April 23, 2009
    Date of Patent: April 10, 2012
    Assignee: Iwasaki Electric Co., Ltd.
    Inventors: Yosuke Kano, Makoto Okahara, Kouji Komata, Yousuke Ishikawa
  • Publication number: 20110204765
    Abstract: A light source apparatus is capable of reliably enhancing the starting performance of a high pressure discharge lamp even during hot state just after extinguishing the high pressure discharge lamp by radiating a necessary and sufficient amount of a UV-light into a discharge bulb of the lamp using an UV-enhancer of a simple constitution without increasing the manufacturing cost is provided. An UV-enhancer for radiating a UV-light to a discharge bulb for enhancing the starting performance of a high pressure discharge lamp upon starting lighting includes a discharge tube connected in parallel to a lighting circuit of the lamp, and an external electrode of the discharge tube is formed as a metal holder that holds the outer periphery of the discharge tube so as to oppose the end face of an electrode seal portion of the lamp inserted through a bottom hole in a concave reflector and secures the electrode seal portion to an electrode lead protruding from the end face thereof.
    Type: Application
    Filed: April 23, 2009
    Publication date: August 25, 2011
    Applicant: IWASAKI ELECTRIC CO., LTD.
    Inventors: Yosuke Kano, Makoto Okahara, Kouji Komata, Yousuke Ishikawa