Patents by Inventor Seiji Hachisuka

Seiji Hachisuka 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).

  • Light source device and display device
    Patent number: 7654698
    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: June 12, 2007
    Date of Patent: February 2, 2010
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Inverter system
    Patent number: 7598748
    Abstract: An inverter system which converts DC input into AC output and supplies the AC output to a load such as an FL tube detects change in a circuit current due to anomaly such as discharge without contacting with a current route. Relating to an inverter which converts DC input into AC output and supplies the AC output to a load, change in a circuit current of the inverter is detected through the medium of magnetic flux change due to the change in the circuit current caused by discharge. For example, if change in a current occurs in the circuit current of the inverter by disconnection discharge or ground-fault discharge occurring in a current route including a load of the inverter, magnetic flux change occurs in circuit wiring and a space of a core gap of a transformer of the inverter. The change in the circuit current is detected through the medium of the magnetic flux change without contacting with the circuit wiring or the transformer.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: October 6, 2009
    Assignee: Fujitsu Limited
    Inventors: Seiji Hachisuka, Masaru Tanaka, Minoru Senba, Shuuichi Yadoori
  • Display device, including discharge tube temperature control member
    Patent number: 7549768
    Abstract: A display device which 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.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: June 23, 2009
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Backlight having a polarization separating element
    Patent number: 7541723
    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: June 2, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Display panel inspection apparatus and method
    Patent number: 7532316
    Abstract: The present invention relates to a display panel inspection apparatus for inspecting a display panel composed of a plurality of pixels. The display panel inspection apparatus comprises a detecting unit detecting whether or not each of the pixels is a defective pixel and a holding unit holding a result of the detection by the detecting unit, thereby enabling reliable and easy detection of a defective pixel occurring temporarily due to variations of operation environment such as semi-contact trouble or semi-disconnection trouble, and others.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: May 12, 2009
    Assignee: Fujitsu Limited
    Inventor: Seiji Hachisuka
  • Light source device and display device
    Patent number: 7513649
    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: June 12, 2007
    Date of Patent: April 7, 2009
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Light source device and display device
    Patent number: 7513650
    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: June 12, 2007
    Date of Patent: April 7, 2009
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Inverter system
    Patent number: 7492162
    Abstract: An inverter system which converts DC input into AC output and supplies the AC output to a load such as an FL tube detects change in a circuit current due to anomaly such as discharge without contacting with a current route. Relating to an inverter which converts DC input into AC output and supplies the AC output to a load, change in a circuit current of the inverter is detected through the medium of magnetic flux change due to the change in the circuit current caused by discharge. For example, if change in a current occurs in the circuit current of the inverter by disconnection discharge or ground-fault discharge occurring in a current route including a load of the inverter, magnetic flux change occurs in circuit wiring and a space of a core gap of a transformer of the inverter. The change in the circuit current is detected through the medium of the magnetic flux change without contacting with the circuit wiring or the transformer.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: February 17, 2009
    Assignee: Fujitsu Limited
    Inventors: Seiji Hachisuka, Masaru Tanaka, Minoru Senba, Shuuichi Yadoori
  • Anomaly detection in inverter system
    Patent number: 7486082
    Abstract: An inverter system which converts DC input into AC output and supplies the AC output to a load such as an FL tube detects change in a circuit current due to anomaly such as discharge without contacting with a current route. Relating to an inverter which converts DC input into AC output and supplies the AC output to a load, change in a circuit current of the inverter is detected through the medium of magnetic flux change due to the change in the circuit current caused by discharge. For example, if change in a current occurs in the circuit current of the inverter by disconnection discharge or ground-fault discharge occurring in a current route including a load of the inverter, magnetic flux change occurs in circuit wiring and a space of a core gap of a transformer of the inverter. The change in the circuit current is detected through the medium of the magnetic flux change without contacting with the circuit wiring or the transformer.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: February 3, 2009
    Assignee: Fujitsu Limited
    Inventors: Seiji Hachisuka, Masaru Tanaka, Minoru Senba, Shuuichi Yadoori
  • Light source device and display device
    Patent number: 7470039
    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: June 12, 2007
    Date of Patent: December 30, 2008
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Light source device and display device
    Patent number: 7470040
    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: June 12, 2007
    Date of Patent: December 30, 2008
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Light source device and display device
    Patent number: 7396144
    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: June 12, 2007
    Date of Patent: July 8, 2008
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Light source device and display device
    Publication number: 20080137376
    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: June 12, 2008
    Applicant: FUJITSU LIMITED
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Backlight having discharge tube, reflector and heat conduction member contacting discharge tube
    Publication number: 20080062700
    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: October 22, 2007
    Publication date: March 13, 2008
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Display panel inspection apparatus and method
    Publication number: 20080030725
    Abstract: The present invention relates to a display panel inspection apparatus for inspecting a display panel composed of a plurality of pixels. The display panel inspection apparatus comprises a detecting unit detecting whether or not each of the pixels is a defective pixel and a holding unit holding a result of the detection by the detecting unit, thereby enabling reliable and easy detection of a defective pixel occurring temporarily due to variations of operation environment such as semi-contact trouble or semi-disconnection trouble, and others.
    Type: Application
    Filed: February 26, 2007
    Publication date: February 7, 2008
    Applicant: FUJITSU LIMITED
    Inventor: Seiji Hachisuka
  • Backlight having discharge tube, reflector and heat conduction member contacting discharge tube
    Patent number: 7309146
    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: April 6, 2005
    Date of Patent: December 18, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
  • Light source device and display device
    Publication number: 20070258269
    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: November 8, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Light source device, and display device, display module, information handling apparatus and portable information handling apparatus comprising same
    Patent number: 7290901
    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: December 23, 2005
    Date of Patent: November 6, 2007
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Light source device and display device
    Patent number: 7290899
    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: December 23, 2005
    Date of Patent: November 6, 2007
    Assignee: Fujitsu Limited
    Inventors: Akio Sotokawa, Seiji Hachisuka
  • Light source device and display device
    Publication number: 20070253220
    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: November 1, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Akio Sotokawa, Seiji Hachisuka