Patents by Inventor Hiroshi Kawato

Hiroshi Kawato 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: 7697206
    Abstract: The present invention provides a prism-integrated light-diffusing plate, characterized in that a prismatic portion formed of a plurality of prism-shaped protrusions is provided on at least one surface of a light-diffusing sheet which is formed of a transparent resin material containing a light-diffusing agent and which has a thickness of 0.5 to 3 mm and a total light transmittance of 60 to 95%. The prism-integrated light-diffusing plate serves as both a prism sheet and a light-diffusing plate, diffuses light uniformly, and increases the brightness of an illumination cover or a liquid crystal display backlight for a large screen.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: April 13, 2010
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Masami Kogure, Hiroshi Kawato
  • Patent number: 7662905
    Abstract: A copolycarbonate; a copolycarbonate composition that contains the copolycarbonate and a polycarbonate resin; a polycarbonate base resin composition that contains the copolycarbonate and an acryl base resin; an optical molded article containing the copolycarbonate; a light guide plate containing the copolycarbonate; a lens containing the copolycarbonate; an optical molded article containing the copolycarbonate composition; a light guide plate containing the copolycarbonate composition; a lens containing the copolycarbonate composition; an optical molded article containing the polycarbonate base resin composition; a light guide plate containing the polycarbonate base resin composition; and an optical molded article containing the polycarbonate base resin composition.
    Type: Grant
    Filed: February 21, 2005
    Date of Patent: February 16, 2010
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Yasuhiro Ishikawa, Hiroshi Kawato, Atsushi Sato
  • Publication number: 20090303411
    Abstract: The present invention relates to a multilayered sheet for light reflection for forming a thin and lightweight reflector, a reflector using it, a lighting unit equipped with the reflector and a liquid crystal display device equipped with the lighting unit, with reduced numbers of components in the lighting unit and in the assembly steps that are attained by preparing a reflector comprising a light reflecting plate, a boss portion for attaching a circuit, a reinforced rib portion and a light diffuser panel supporting frame, and, optionally comprising a lamp holder, a lamp supporter and a light diffuser panel supporting column integrated in a single piece, a lighting unit equipped with the reflector and a liquid crystal display device using the lighting unit, wherein the multilayered sheet for light reflection includes a multilayered sheet for light reflection comprising a light reflecting resin layer (A) and a resin substrate layer (B) which contains an inorganic filler in an amount of 30% by mass or more and h
    Type: Application
    Filed: May 24, 2007
    Publication date: December 10, 2009
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Masami Kogure, Toshio Isozaki
  • Publication number: 20090186208
    Abstract: Provided is a light diffusing resin composition, which, when molded into a large-plane light diffusing plate, is free of yellowing due to thermal deterioration, and can exhibit good light diffusing property, and a light diffusing plate using the resin composition. The light diffusing resin composition includes 100 parts by mass of a polycarbonate resin containing a polycarbonate copolymer (A) having repeating structural units represented by formulae (I) and (II) and 0.01 to 10 parts by mass of a light diffusing agent (B).
    Type: Application
    Filed: April 9, 2007
    Publication date: July 23, 2009
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Yasuhiro Ishikawa, Masami Kogure, Hiroshi Kawato
  • Patent number: 7553893
    Abstract: A polycarbonate resin composition comprising polycarbonate resin (A) and, blended therewith per 100 parts by mass thereof, 0.001 to 0.1 part by mass of arylphosphine (B) and 0.01 to 1.0 part by mass of alicyclic epoxy compound (C); or a polycarbonate resin composition comprising polycarbonate resin (A) and, blended therewith per 100 parts by mass thereof, 0.001 to 0.1 part by mass of arylphosphine (B), 0.01 to 1.0 part by mass of alicyclic epoxy compound (C) and 0.01 to 1.0 part by mass of acrylic resin (D). The polycarbonate resin composition exhibits excellent optical properties, excelling in resistance to high temperature high humidity, resistance to heat aging (especially high temperature aging), heat resistance and impact resistance, and is suitable for production of optical parts, such as a lens of optical semiconductor device mounted on vehicles which can be used even in especially severe environment. There is further provided an optical part molded from the polycarbonate resin composition.
    Type: Grant
    Filed: October 5, 2004
    Date of Patent: June 30, 2009
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Yoshihiko Horio, Yasuhiro Ishikawa
  • Publication number: 20090122216
    Abstract: The present invention provides a housing structure for a lighting device, including a molded product having a thickness of 1.5 to 3.5 mm produced from a polycarbonate-based resin composition containing 20 to 60% by mass of titanium oxide, and a method of producing a housing structure for a lighting device, including: subjecting a polycarbonate-based resin composition containing 20 to 60% by mass of titanium oxide into a sheet; and subjecting the sheet to vacuum forming or pressing to produce a box-type molded product in which a fixing portion of a terminal of a light source is molded integrally to an inner side portion of the molded product. Also provided are a housing structure for a lighting device, which is lightweight and requires small man-hour for assembling, a method of manufacturing the same, a backlight device using the housing for a lighting device, and a liquid crystal display member.
    Type: Application
    Filed: August 11, 2006
    Publication date: May 14, 2009
    Inventors: Masami Kogure, Hiroshi Kawato
  • Publication number: 20090116115
    Abstract: The present invention provides: a polycarbonate light diffusing resin composition in which a first discoloration is a little, and particularly a photo-deterioration caused by a cold-cathode tube as a light source of liquid crystal displays is suppressed; and a light diffuser panel obtained by molding the same. The polycarbonate light diffusing resin composition comprises: (A) 100 parts by mass of an aromatic polycarbonate resin; (B) 0.01 to 10 parts by mass of a light diffusing agent; and (C) 0.05 to 5 parts by mass of a light-resisting agent having a maximum absorption wavelength at 290 to 330 nm in an ultraviolet light absorption spectrum and the light diffuser panel is a light diffuser panel having a thickness of 0.5 to 2 mm and obtained by molding the polycarbonate light diffusing resin composition.
    Type: Application
    Filed: October 20, 2005
    Publication date: May 7, 2009
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Masami Kogure, Hiroshi Kawato
  • Publication number: 20090093583
    Abstract: The present invention provides a light diffusing polycarbonate resin composition including a polycarbonate resin containing a polycarbonate copolymer which comprises a repeating unit represented by the general formula (I) shown below and a repeating unit represented by the general formula (II) shown below, which has a content of the repeating units of the general formula (II) of 1 to 30% by mass and which has a viscosity value of 30 to 71, and (B) a light diffusing agent compounded therein in an amount of 0.01 to 10 parts by mass per 100 parts by mass of the polycarbonate resin. The light diffusing polycarbonate resin composition and a light diffusing plate thereof show improved fluidity during molding and have excellent heat resistance, dimensional stability, luminance and color tone.
    Type: Application
    Filed: June 22, 2006
    Publication date: April 9, 2009
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Masami Kogure, Yoshihiko Horio, Yasuhiro Ishikawa
  • Publication number: 20090080079
    Abstract: The present invention provides a light-diffusive polycarbonate-based resin composition which includes (A) 100 parts by mass of an aromatic polycarbonate resin, (B) 0.01 to parts by mass of a light-diffusing agent, and (C) 0.1 to parts by mass of a styrene-(meth)acrylic ester copolymer, and a light-diffusing plate formed from the composition. The light-diffusive polycarbonate-based resin composition can be injection-molded to form a light-diffusing plate having satisfactory precision in thickness for use in comparatively large liquid crystal displays having a size larger than 20 inches.
    Type: Application
    Filed: May 25, 2006
    Publication date: March 26, 2009
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Masami Kogure, Hiroshi Kawato
  • Publication number: 20080287610
    Abstract: Provided is a copolycarbonate which can meet a wide range of molding conditions as a raw material and which results in providing good optical molded articles. It is a copolycarbonate comprising repetitive units represented by the following Formulas (I) and (II), wherein a content of the repetitive unit represented by Formula (II) described below is 1 to 30 mass %, and a viscosity number is 30 to 71. In the formulas, R1 and R2 represent an alkyl group having 1 to 6 carbon atoms; X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, —S—, —SO—, —SO2—, —O—, —CO— or the like; R3 and R4 represent an alkyl group having 1 to 3 carbon atoms; Y represents a linear or branched alkylene group having 2 to 15 carbon atoms; a to d each are an integer of 0 to 4; and n is an integer of 2 to 450.
    Type: Application
    Filed: February 21, 2005
    Publication date: November 20, 2008
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Yasuhiro Ishikawa, Hiroshi Kawato, Atsushi Sato
  • Publication number: 20080212213
    Abstract: The present invention provides a light shielding highly reflective laminated sheet, which is a multilayer sheet comprising at least two layers, wherein the total light reflectance (Y value) of the surface of the first layer is 96% or more, the total light reflectance (Y value) of the surface of the outermost layer opposite to the first layer in the multilayer sheet is 30% or less and the total light transmittance of the laminated sheet is 0.3% or less, and a thermomolded article and a case using thereof. In application to light reflection for a liquid crystal backlight unit and the like, the light shielding highly reflective laminated sheet, the thermomolded article and the case using thereof of the present invention can prevent light leakage from a lamp holder portion and also make it possible to integrate a plurality of components of the backlight unit into a single body owing to improved workability of the sheet.
    Type: Application
    Filed: May 20, 2005
    Publication date: September 4, 2008
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Masami Kogure, Hiroshi Kawato
  • Publication number: 20080076866
    Abstract: Provided are a polycarbonate resin composition which does not contain halogen and phosphorus as a flame retardant component and which is excellent in a fluidity while maintaining a flame resistance, a heat resistance and an impact resistance and a molded article thereof.
    Type: Application
    Filed: November 26, 2007
    Publication date: March 27, 2008
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Kenichi MITSUHASHI, Akio Nodera, Hiroshi Kawato, Toshio Isozaki
  • Publication number: 20080062542
    Abstract: A light reflecting sheet having high light reflectance and an excellent light shielding property and a molded product using the same are provided. The light reflecting sheet has a light reflecting layer that has voids inside thereof and formed from a thermoplastic resin composition provided on at least one side of a base material sheet formed from a polycarbonate resin composition containing a combination of (A) 90 to 50% by mass of a polycarbonate-based polymer and (B) 10 to 50% by mass of titanium oxide. The molded product is formed from the light-reflecting sheet.
    Type: Application
    Filed: July 27, 2005
    Publication date: March 13, 2008
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Masami Kogure, Hiroshi Kawato
  • Publication number: 20080014376
    Abstract: The present invention provides a thermoplastic resin composition characterized by comprising (A) a thermoplastic resin and (B) a white pigment in a mass ratio of 50:50 to 90:10 and further comprising (C) a black coloring material and a blue coloring material; and provides a formed article using the resin composition. The above thermoplastic resin composition is an improvement of the conventional technique for preventing the permeation of light from a thin part of the formed article while securing a satisfactory reflectance, and can markedly improve the light blocking effect of a thermoplastic resin composition, without the increase of the number of parts, the employment of a more complicated process, or the like.
    Type: Application
    Filed: April 20, 2005
    Publication date: January 17, 2008
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Yoshihiko Horio, Hiroshi Kawato
  • Publication number: 20070229995
    Abstract: A modularized reflector is produced by integrating or laminating: a sheet metal back chassis in which a light source supporting section, a through-hole or a groove for extracting a light source electrode terminal, and a frame for supporting a light diffusing plate and an optical film are integrally formed through sheet metal working; and a light reflecting layer made of a molded product of a light reflective thermoplastic resin material formed into a shape for covering the back chassis. By producing a backlight device and a liquid crystal display using the reflector, there are provided the reflector reduced in the number of components, in the number of assembly steps, and in weight and thickness, and a back light and a liquid crystal display using the reflector.
    Type: Application
    Filed: June 10, 2005
    Publication date: October 4, 2007
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Masami Kogure
  • Publication number: 20070218293
    Abstract: The present invention provides a thin light-reflecting sheet with excellent light property of flame retardancy, a high light-reflectance and a high light-shielding ability, which is formed from a polycarbonate resin composition containing a combination of 70% to 30% by mass of a polycarbonate-based polymer (A) and 30% to 70% by mass of titanium oxide (B) having a difference of moisture concentration at 100° C. with that at 300° C. of 2700 ppm by mass or less. The invention also provides a shaped article thereof.
    Type: Application
    Filed: September 13, 2005
    Publication date: September 20, 2007
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Masami Kogure
  • Publication number: 20070213452
    Abstract: The present invention provides a light-diffusing resin composition comprising (A) an aromatic polycarbonate resin in an amount of 100 parts by mass, (B) an acrylic resin in an amount of 0.01 to 1 part by mass, and (C) a light-diffusing agent in an amount of 0.01 to 10 parts by mass, the light-diffusing resin composition which is usable for optical elements in the field of liquid crystal displays, such as light diffuser plates, optical lenses and optical guide plates, street lamp covers, glass substitutes such as laminated glass for vehicles or construction materials, and the like.
    Type: Application
    Filed: April 5, 2005
    Publication date: September 13, 2007
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Masami Kogure, Yosihiko Horio
  • Publication number: 20070195418
    Abstract: The present invention provides a prism-integrated light-diffusing plate, characterized in that a prismatic portion formed of a plurality of prism-shaped protrusions is provided on at least one surface of a light-diffusing sheet which is formed of a transparent resin material containing a light-diffusing agent and which has a thickness of 0.5 to 3 mm and a total light transmittance of 60 to 95%. The prism-integrated light-diffusing plate serves as both a prism sheet and a light-diffusing plate, diffuses light uniformly, and increases the brightness of an illumination cover or a liquid crystal display backlight for a large screen.
    Type: Application
    Filed: April 28, 2005
    Publication date: August 23, 2007
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Masami Kogure, Hiroshi Kawato
  • Patent number: 7253223
    Abstract: A polycarbonate resin composition which has excellent flame retardancy, even when containing neither any phosphorus compound flame retardant nor any halogenated flame retardant, and which is highly reflective and has light-shutting properties and excellent thermal stability. The polycarbonate resin composition comprises 5 to 98 parts by weight of a polycarbonate/polyorganosiloxane copolymer, 0 to 93 parts by weight of a polycarbonate resin, 2 to 50 parts by weight of titanium oxide, 0 to 1.0 parts by weight of a fibril-forming polytetrafluoroethylene, and 0.05 to 2.0 parts by weight of an organosiloxane, the sum of the ingredients (A), (B), and (C) is 100 parts by weight.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: August 7, 2007
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Keisuke Funaki, Masami Kogure, Hiroshi Akamine
  • Publication number: 20070054110
    Abstract: A light-reflecting polycarbonate resin sheet is characterized in that a light-resistant layer for cutting or absorbing ultraviolet light is provided on at least one side of a polycarbonate resin foam layer. A light-reflecting laminate is obtained by superposing such a light-reflecting polycarbonate resin sheet on a metal plate. The light-reflecting polycarbonate resin sheet has high light resistance while maintaining excellent reflective characteristics.
    Type: Application
    Filed: October 5, 2004
    Publication date: March 8, 2007
    Applicant: Idemiksu Kosan Co. Ltd
    Inventors: Hiroshi Kawato, Masami Kogure, Keisuke Funaki, Yosihiko Horio