Patents by Inventor Akio Sotokawa

Akio Sotokawa 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: 20070242482
    Abstract: A light source device includes a discharge tube, a reflector for reflecting a light radiated from the discharge tube, and support members for supporting the discharge tube to the reflector. The support member or the discharge tube is formed of a heat insulating structure so as to prevent a temperature drop of a portion of the discharge tube near electrodes thereof. By this arrangement, it is possible to prolong the operational life of the discharge tube.
    Type: Application
    Filed: June 12, 2007
    Publication date: October 18, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20070242481
    Abstract: A light source device includes a discharge tube, a reflector for reflecting a light radiated from the discharge tube, and support members for supporting the discharge tube to the reflector. The support member or the discharge tube is formed of a heat insulating structure so as to prevent a temperature drop of a portion of the discharge tube near electrodes thereof. By this arrangement, it is possible to prolong the operational life of the discharge tube.
    Type: Application
    Filed: June 12, 2007
    Publication date: October 18, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Patent number: 7169005
    Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: January 30, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Patent number: 7070291
    Abstract: A light source device includes a discharge tube, a reflector for reflecting a light radiated from the discharge tube, and support members for supporting the discharge tube to the reflector. The support member or the discharge tube is formed of a heat insulating structure so as to prevent a temperature drop of a portion of the discharge tube near electrodes thereof. By this arrangement, it is possible to prolong the operational life of the discharge tube.
    Type: Grant
    Filed: September 17, 2003
    Date of Patent: July 4, 2006
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20060097642
    Abstract: A light source device includes a discharge tube, a reflector for reflecting a light radiated from the discharge tube, and support members for supporting the discharge tube to the reflector. The support member or the discharge tube is formed of a heat insulating structure so as to prevent a temperature drop of a portion of the discharge tube near electrodes thereof. By this arrangement, it is possible to prolong the operational life of the discharge tube.
    Type: Application
    Filed: December 23, 2005
    Publication date: May 11, 2006
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20060098436
    Abstract: A light source device includes a discharge tube, a reflector for reflecting a light radiated from the discharge tube, and support members for supporting the discharge tube to the reflector. The support member or the discharge tube is formed of a heat insulating structure so as to prevent a temperature drop of a portion of the discharge tube near electrodes thereof. By this arrangement, it is possible to prolong the operational life of the discharge tube.
    Type: Application
    Filed: December 23, 2005
    Publication date: May 11, 2006
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20050255784
    Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.
    Type: Application
    Filed: June 30, 2005
    Publication date: November 17, 2005
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20050242693
    Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.
    Type: Application
    Filed: June 30, 2005
    Publication date: November 3, 2005
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20050236948
    Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.
    Type: Application
    Filed: June 30, 2005
    Publication date: October 27, 2005
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20050179352
    Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.
    Type: Application
    Filed: April 6, 2005
    Publication date: August 18, 2005
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20040062042
    Abstract: A light source device includes a discharge tube, a reflector for reflecting a light radiated from the discharge tube, and support members for supporting the discharge tube to the reflector. The support member or the discharge tube is formed of a heat insulating structure so as to prevent a temperature drop of a portion of the discharge tube near electrodes thereof. By this arrangement, it is possible to prolong the operational life of the discharge tube.
    Type: Application
    Filed: September 17, 2003
    Publication date: April 1, 2004
    Applicant: FUJITSU LIMITED
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20020113534
    Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.
    Type: Application
    Filed: December 4, 2001
    Publication date: August 22, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Publication number: 20010028366
    Abstract: An electronic equipment is provided with a main display section, an auxiliary display section having a display area smaller than that of the main display section, and a controller displaying a plurality of status information of the electronic equipment in the auxiliary display section by a combination of a message using characters and at least one of symbols and a color display and/or a blinking display of the auxiliary display section.
    Type: Application
    Filed: March 22, 2001
    Publication date: October 11, 2001
    Inventors: Hisashi Ohki, Toshihisa Masuzawa, Ryoji Hirayama, Yuji Aoyama, Tetsushi Hatakeyama, Naoyuki Inoue, Masafumi Okumura, Akio Sotokawa, Eisuke Nakada, Toshio Oka, Kazuhiro Takeda, Masato Ageta, Takashi Suda, Keigo Matsunaga, Mitsuru Kodama
  • Patent number: 6294881
    Abstract: An object of the present invention is to effectively operate a discharging tube. A voltage raising unit and a discharging unit are disposed in a discharging tube. When a voltage is supplied to the discharging tube, the voltage raising unit raises the voltage to be supplied to the discharging tube. The raised voltage is supplied to the discharging unit. Thus, the discharging unit discharges electricity.
    Type: Grant
    Filed: March 9, 2000
    Date of Patent: September 25, 2001
    Assignee: Fujitsu Limited
    Inventors: Shingo Miyazaki, Yoshio Shimeki, Akio Sotokawa
  • Patent number: 6057653
    Abstract: An object of the present invention is to effectively operate a discharging tube. A voltage raising unit and a discharging unit are disposed in a discharging tube. When a voltage is supplied to the discharging tube, the voltage raising unit raises the voltage to be supplied to the discharging tube. The raised voltage is supplied to the discharging unit. Thus, the discharging unit discharges electricity.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: May 2, 2000
    Assignee: Fujitsu Limited
    Inventors: Shingo Miyazaki, Yoshio Shimeki, Akio Sotokawa
  • Patent number: 5550657
    Abstract: A planar illumination unit includes an optical guide layer for guiding light therethrough and emitting the light from a top surface, a light source fixture provided so as to face a side wall of the optical guide layer for injecting a light into the optical guide layer, an optical scattering layer disposed above the top surface of the optical guide layer for causing a scattering in the light that has been received from the optical guide layer, and a reflector provided on a bottom surface of the optical guide layer for reflecting the light incident to the optical guide layer, wherein the light source fixture includes a reflector for reflecting the light that has been produced by a light source in a direction primarily offset from the light source.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: August 27, 1996
    Assignee: Fujitsu Limited
    Inventors: Akira Tanaka, Yoshinori Mesaki, Akio Sotokawa, Masahiro Tomatsu, Kazumasa Kaiwa