Patents by Inventor Takeshi Haritani

Takeshi Haritani 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: 8355203
    Abstract: An optical functional film which exhibits excellent optical characteristics without using an alignment film, and having the excellent adhesion property between layers. The optical functional film includes: a substrate having a property as an optically negative C-plate, and an optical functional layer formed on the substrate and having a rodlike compound. The optical functional layer is formed directly on the substrate, and the rodlike compound forms a random homogeneous alignment in the optical functional layer.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: January 15, 2013
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Keiji Kashima, Kenji Shirai, Takashi Kuroda, Takeshi Haritani
  • Patent number: 8124198
    Abstract: The main object of the present invention is to provide a highly reliable biaxial retardation film without the problems of peeling off of the retardation layer from the base material or the like generated in the case of forming the retardation layer, capable of enlarging the range of the thickness direction and in-plane direction retardation values to be obtained, easily obtaining optional thickness direction and in-plane direction retardation values even for a small amount, a method for producing the same, an optical functional film using the retardation layer, a polarizing film and a display device. In order to achieve the above-mentioned object, an optically biaxial retardation film, comprising a polymer film containing a material having refractive index anisotropy, wherein the material having refractive index anisotropy has a concentration gradient in a thickness direction of the polymer film, is provided.
    Type: Grant
    Filed: August 15, 2006
    Date of Patent: February 28, 2012
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Keiji Kashima, Takeshi Haritani, Kenji Shirai
  • Patent number: 8064136
    Abstract: An optical functional film which exhibits excellent optical characteristics without using an alignment film, and having the excellent adhesion property between layers. The optical functional film includes: a substrate having a property as an optically negative C-plate, and an optical functional layer formed on the substrate and having a rodlike compound. The optical functional layer is formed directly on the substrate, and the rodlike compound forms a random homogeneous alignment in the optical functional layer.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: November 22, 2011
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Keiji Kashima, Kenji Shirai, Takashi Kuroda, Takeshi Haritani
  • Publication number: 20110253932
    Abstract: An optical functional film which exhibits excellent optical characteristics without using an alignment film, and having the excellent adhesion property between layers. The optical functional film includes: a substrate having a property as an optically negative C-plate, and an optical functional layer formed on the substrate and having a rodlike compound. The optical functional layer is formed directly on the substrate, and the rodlike compound forms a random homogeneous alignment in the optical functional layer.
    Type: Application
    Filed: June 30, 2011
    Publication date: October 20, 2011
    Applicant: DAI NIPPON PRINTING CO., LTD.
    Inventors: Keiji KASHIMA, Kenji SHIRAI, Takashi KURODA, Takeshi HARITANI
  • Publication number: 20100159158
    Abstract: An optical functional film exhibiting optical biaxiality which has a high degree of freedom in optical characteristics design. The optical functional film which exhibits optical biaxiality and includes: a substrate; and an optical functional layer formed on the substrate and having a rodlike compound. The rodlike compound forms irregular-random homogeneous alignment in the optical functional layer.
    Type: Application
    Filed: May 14, 2007
    Publication date: June 24, 2010
    Inventors: Takayuki Shibata, Keiji Kashima, Shoji Takeshige, Kenji Shirai, Takeshi Haritani, Yusuke Hiruma, Runa Nakamura, Hiroki Nakagawa, Masanori Fukuda, Takashi Kuroda, Yuya Inomata
  • Publication number: 20100149638
    Abstract: An optical functional film which exhibits excellent optical characteristics without using an alignment film, and having the excellent adhesion property between layers. The optical functional film includes: a substrate having a property as an optically negative C-plate, and an optical functional layer formed on the substrate and having a rodlike compound. The optical functional layer is formed directly on the substrate, and the rodlike compound forms a random homogeneous alignment in the optical functional layer.
    Type: Application
    Filed: September 28, 2006
    Publication date: June 17, 2010
    Inventors: Keiji Kashima, Kenji Shirai, Takashi Kuroda, Takeshi Haritani
  • Publication number: 20070042189
    Abstract: A main object of the present invention is to provide a highly reliable retardation film without the problems of peeling off of the retardation layer from the base material or the like generated in the case of forming the retardation layer, capable of easily obtaining an optional retardation value even for a small amount, and capable of improving the adhering property with a hydrophilic film such as a polarizing layer. In order to achieve the above-mentioned object, the present invention provides a retardation film, comprising a polymer film containing a material having refractive index anisotropy, wherein the material having refractive index anisotropy has a concentration gradient in a thickness direction of the polymer film.
    Type: Application
    Filed: August 15, 2006
    Publication date: February 22, 2007
    Inventors: Kenji Shirai, Keiji Kashima, Takashi Kuroda, Takeshi Haritani
  • Publication number: 20070036918
    Abstract: The main object of the present invention is to provide a highly reliable biaxial retardation film without the problems of peeling off of the retardation layer from the base material or the like generated in the case of forming the retardation layer, capable of enlarging the range of the thickness direction and in-plane direction retardation values to be obtained, easily obtaining optional thickness direction and in-plane direction retardation values even for a small amount, a method for producing the same, an optical functional film using the retardation layer, a polarizing film and a display device. In order to achieve the above-mentioned object, an optically biaxial retardation film, comprising a polymer film containing a material having refractive index anisotropy, wherein the material having refractive index anisotropy has a concentration gradient in a thickness direction of the polymer film, is provided.
    Type: Application
    Filed: August 15, 2006
    Publication date: February 15, 2007
    Inventors: Keiji Kashima, Takeshi Haritani, Kenji Shirai
  • Publication number: 20060279865
    Abstract: An optical element, with an improved adhesion strength of the liquid crystal layer, and without substantial deterioration of the optical characteristics (such as transparency deterioration, white turbidity and display irregularity). The optical element has a transparent substrate, an alignment layer, and a liquid crystal layer formed on above-mentioned transparent substrate via the alignment layer. The liquid crystal layer contains an adhesion improving agent; a retardation plate including the above-mentioned optical element; an optical laminated body including the above-mentioned optical element and a polarizing plate; and a display apparatus including the above-mentioned retardation plate or optical laminated body disposed on the optical path.
    Type: Application
    Filed: February 6, 2006
    Publication date: December 14, 2006
    Inventors: Norihito Ito, Takeshi Haritani, Keiko Tazaki, Shoji Takeshige
  • Publication number: 20060105115
    Abstract: The main object of the present invention is to provide a highly reliable biaxial retardation film without the problems of peeling off of the retardation layer from the base material or the like generated in the case of forming the retardation layer, capable of enlarging the range of the thickness direction and in-plane direction retardation values to be obtained, easily obtaining optional thickness direction and in-plane direction retardation values even for a small amount, a method for producing the same, an optical functional film using the retardation layer, a polarizing film and a display device. In order to achieve the above-mentioned object, an optically biaxial retardation film, comprising a polymer film containing a material having refractive index anisotropy, wherein the material having refractive index anisotropy has a concentration gradient in a thickness direction of the polymer film, is provided.
    Type: Application
    Filed: January 19, 2005
    Publication date: May 18, 2006
    Inventors: Keiji Kashima, Takeshi Haritani, Kenji Shirai
  • Publication number: 20060073340
    Abstract: A main object of the present invention is to provide a highly reliable retardation film without the problems of peeling off of the retardation layer from the base material or the like generated in the case of forming the retardation layer, capable of easily obtaining an optional retardation value even for a small amount, and capable of improving the adhering property with a hydrophilic film such as a polarizing layer. In order to achieve the above-mentioned object, the present invention provides a retardation film, comprising a polymer film containing a material having refractive index anisotropy, wherein the material having refractive index anisotropy has a concentration gradient in a thickness direction of the polymer film.
    Type: Application
    Filed: January 19, 2005
    Publication date: April 6, 2006
    Inventors: Kenji Shirai, Keiji Kashima, Takashi Kuroda, Takeshi Haritani