Patents by Inventor Ken Kagabu

Ken Kagabu 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: 9194994
    Abstract: A liquid crystal display device includes: a light guide plate including a front surface, a back surface and an edge surface, the light guide plate being arranged such that the edge surface faces a light source, the light guide plate internally reflecting light incident from the edge surface and causing surface emission from the front surface; a liquid crystal display panel; and a reflective sheet arranged so as to face the back surface of the light guide plate. The back surface includes a first portion and a second portion. A surface of the second portion is located at a position recessed relatively from a surface of the first portion. The surface of the first portion is a rough surface. The surface of the second portion is a smooth surface. The reflective sheet is in contact with the first portion but avoids contact with the second portion.
    Type: Grant
    Filed: January 6, 2014
    Date of Patent: November 24, 2015
    Assignee: JAPAN DISPLAY INC.
    Inventors: Ken Kagabu, Yasuhisa Shiraishi, Yoshikazu Tanabe, Yoshihiro Nishimine
  • Publication number: 20140192293
    Abstract: A liquid crystal display device includes: a light guide plate including a front surface, a back surface and an edge surface, the light guide plate being arranged such that the edge surface faces a light source, the light guide plate internally reflecting light incident from the edge surface and causing surface emission from the front surface; a liquid crystal display panel; and a reflective sheet arranged so as to face the back surface of the light guide plate. The back surface includes a first portion and a second portion. A surface of the second portion is located at a position recessed relatively from a surface of the first portion. The surface of the first portion is a rough surface. The surface of the second portion is a smooth surface. The reflective sheet is in contact with the first portion but avoids contact with the second portion.
    Type: Application
    Filed: January 6, 2014
    Publication date: July 10, 2014
    Applicant: Japan Display Inc.
    Inventors: Ken KAGABU, Yasuhisa SHIRAISHI, Yoshikazu TANABE, Yoshihiro NISHIMINE
  • Patent number: 8517591
    Abstract: In a method of forming a thin light guide plate which includes a compression step in an injection molding step, an optical pattern is liable to be adhered to a mold. Further, in removing the light guide plate from the mold using an ejector pin, a stress is concentrated on a local area of the light guide plate thus generating warping, deformation or irregularities in size of the light guide plate. To overcome such drawbacks, a liquid crystal display device is configured such that an optical pattern portion is compressed, and the light guide plate is removed by making use of a peripheral portion of a mold thus preventing the generation of stress in a local area of the light guide plate due to an ejector pin.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: August 27, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hiroshi Nakamoto, Yoshikazu Tanabe, Ken Kagabu
  • Patent number: 7855765
    Abstract: In a backlight which arranges light emitting diodes on a side surface of a light guide plate, even when the light emitting diodes having a thickness larger than a thickness of the light guide plate are used, it is possible to manufacture the light guide plate with high accuracy by injection molding. In a liquid crystal display device having a backlight which radiates light to a liquid crystal panel, LEDs are mounted on the light guide plate formed on the backlight as a light emitting element, and an S-shaped inclined portion whose thickness is not changed is formed on the light guide plate from a light incident surface to a light emitting surface of the light guide plate. Since the thickness of the inclined portion is not changed, it is possible to make the pressure of resin flow at the time of performing injection molding uniform thus manufacturing the light guide plate with high accuracy.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: December 21, 2010
    Assignees: Hitachi Displays, Ltd., Hitachi Display Devices, Ltd.
    Inventors: Yoshiaki Takahashi, Masayuki Mifune, Ken Kagabu, Hidehiro Hanada, Nobuyuki Suzuki
  • Publication number: 20090213619
    Abstract: In a method of forming a thin light guide plate which includes a compression step in an injection molding step, an optical pattern is liable to be adhered to a mold. Further, in removing the light guide plate from the mold using an ejector pin, a stress is concentrated on a local area of the light guide plate thus generating warping, deformation or irregularities in size of the light guide plate. To overcome such drawbacks, a liquid crystal display device is configured such that an optical pattern portion is compressed, and the light guide plate is removed by making use of a peripheral portion of a mold thus preventing the generation of stress in a local area of the light guide plate due to an ejector pin.
    Type: Application
    Filed: February 18, 2009
    Publication date: August 27, 2009
    Inventors: Hiroshi Nakamoto, Yoshikazu Tanabe, Ken Kagabu
  • Patent number: 7570321
    Abstract: A liquid crystal display device having includes a light guide plate having a surface thereof serving as an illuminating surface region opposite to a liquid crystal display panel, light sources mounted on a flexible printed-circuit board and provided on a side face of the light guide plate, an optical sheet member interposed between the liquid crystal display panel and the light guide plate. The side surfaces of the light guide plate with the light sources provided thereon have a ridge-like inclined surface formed thereon, when viewed from the illuminating surface, and the ridge-like inclined surfaces serve as a light-receiving surface with the light source arranged thereon.
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: August 4, 2009
    Assignees: Hitachi Displays, Ltd., Hitachi Display Devices, Ltd.
    Inventors: Yoshiaki Takahashi, Masahiko Kurihara, Masayuki Mifune, Ken Kagabu
  • Publication number: 20090073347
    Abstract: In a backlight which arranges light emitting diodes on a side surface of a light guide plate, even when the light emitting diodes having a thickness larger than a thickness of the light guide plate are used, it is possible to manufacture the light guide plate with high accuracy by injection molding. In a liquid crystal display device having a backlight which radiates light to a liquid crystal panel, LEDs are mounted on the light guide plate formed on the backlight as a light emitting element, and an S-shaped inclined portion whose thickness is not changed is formed on the light guide plate from a light incident surface to a light emitting surface of the light guide plate. Since the thickness of the inclined portion is not changed, it is possible to make the pressure of resin flow at the time of performing injection molding uniform thus manufacturing the light guide plate with high accuracy.
    Type: Application
    Filed: September 8, 2008
    Publication date: March 19, 2009
    Inventors: Yoshiaki Takahashi, Masayuki Mifune, Ken Kagabu, Hidehiro Hanada, Nobuyuki Suzuki
  • Publication number: 20070008457
    Abstract: A liquid crystal display device having includes a light guide plate having a surface thereof serving as an illuminating surface region opposite to a liquid crystal display panel, light sources mounted on a flexible printed-circuit board and provided on a side face of the light guide plate, an optical sheet member interposed between the liquid crystal display panel and the light guide plate. The side surfaces of the light guide plate with the light sources provided thereon have a ridge-like inclined surface formed thereon, when viewed from the illuminating surface, and the ridge-like inclined surfaces serve as a light-receiving surface with the light source arranged thereon.
    Type: Application
    Filed: July 7, 2006
    Publication date: January 11, 2007
    Inventors: Yoshiaki Takahashi, Masahiko Kurihara, Masayuki Mifune, Ken Kagabu
  • Patent number: 6541903
    Abstract: The profile lines of plate-like grid electrodes are formed by a first punching step and separation lines of the plate-like grid electrodes are formed by a subsequent punching step. The angle of a crossing portion formed by the profile line and the separation line is set to not less than 70 degrees and not more than 110 degrees. Due to such a constitution, burrs on the plate-like grid electrode which constitutes an electron gun of a color cathode ray tube can be reduced so that the quality of the cathode ray tube can be enhanced and the manufacturing time of the cathode ray tube can be shortened.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: April 1, 2003
    Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.
    Inventors: Ken Kagabu, Takeshi Mera, Akihito Sudo
  • Patent number: 6476543
    Abstract: A cathode ray tube has a phosphor screen and an electron gun. The electron gun includes an electron beam generating section and an electron beam focusing section for focusing an electron beam from the electron beam generating section onto the phosphor screen. The electron beam generating section and the electron beam focusing section are mounted in predetermined spaced relationship on plural insulator support rods. The electron beam focusing section includes at least one compound electrode formed of a first electrode member, a second electrode member and a plate-like electrode member sandwiched therebetween. The plate-like electrode member is fabricated from a material thicker than materials from which the first and second electrode members are fabricated. The plate-like electrode member is laser-welded to the first and second electrode members at points of edges of the first and second electrode members.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: November 5, 2002
    Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co.,
    Inventors: Takeshi Mera, Yoshifumi Konishi, Ken Kagabu, Akihito Sudo
  • Publication number: 20010035708
    Abstract: The present invention provides a color cathode ray tube which can make the focusing of a center electron beam and side electron beams uniform by reducing the non-uniformity of the spot shape of electron beams depending on a deflection quantity.
    Type: Application
    Filed: April 17, 2001
    Publication date: November 1, 2001
    Inventors: Yoshiaki Takahashi, Masayoshi Furuyama, Takeshi Mera, Ken Kagabu