Patents by Inventor Keiji Kashima

Keiji Kashima 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: 10890777
    Abstract: Disclosed is a selectively reflective member which can uniformly reflect only a desired wavelength with high efficiency even in a large area and, at the same time, is highly cost effective. Specifically, there is provided an electromagnetic wave reflecting member that reflects electromagnetic waves with a specific wavelength, the electromagnetic wave reflecting member comprising a first selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength ? in incident electromagnetic waves, a phase difference layer, and a second selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength ?, provided in that order, the phase difference layer having a retardation satisfying the following equation: Re={(2n+1)/2±0.2}×? wherein Re represents average retardation; ? represents wavelength; and n is an integer of 1 or more.
    Type: Grant
    Filed: August 22, 2018
    Date of Patent: January 12, 2021
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Takashi Kuroda, Satoru Hamada, Keiji Kashima
  • Publication number: 20180356644
    Abstract: Disclosed is a selectively reflective member which can uniformly reflect only a desired wavelength with high efficiency even in a large area and, at the same time, is highly cost effective. Specifically, there is provided an electromagnetic wave reflecting member that reflects electromagnetic waves with a specific wavelength, the electromagnetic wave reflecting member comprising a first selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength ? in incident electromagnetic waves, a phase difference layer, and a second selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength ?, provided in that order, the phase difference layer having a retardation satisfying the following equation: Re={(2n+1)/2±0.2}×? wherein Re represents average retardation; ? represents wavelength; and n is an integer of 1 or more.
    Type: Application
    Filed: August 22, 2018
    Publication date: December 13, 2018
    Applicant: Dai Nippon Printing Co., Ltd.
    Inventors: Takashi KURODA, Satoru Hamada, Keiji Kashima
  • Patent number: 9869809
    Abstract: Sufficiently sharp directivity can be secured with a simple configuration in a configuration that improves the efficiency of utilizing the light exiting from a primary light source using a reflective polarizing plate. A backlight unit (2) supplies light exiting from an exit surface of a light guide plate (12) to a liquid-crystal display panel (3) via a reflective polarizing plate (16) after correcting directivity of the exiting light using a prism sheet (14) having a downwardly convex shape. A ¼-wavelength plate (15) is provided between the prism sheet (14) and the reflective polarizing plate (16), between the prism sheet (14) and the light guide plate, or between the light guide plate and a reflective sheet disposed on a surface of the light guide plate opposite to the prism sheet (14).
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: January 16, 2018
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Keiji Kashima, Yasuki Suzuura, Hiroshi Yamamoto, Takashi Kuroda
  • Patent number: 9720154
    Abstract: A pattern phase difference film is manufactured by a process including a laminate body formation step of applying a pattern alignment layer composition on a substrate to form a laminate body, a heat-drying layer formation step of heat-drying the composition to form a heat-dried layer, a pattern alignment layer formation step of irradiating a polarization pattern onto the heat-dried layer to form a pattern alignment layer, and a phase difference layer formation step of forming a phase difference layer including a rod-shaped compound on the pattern alignment layer. During the steps between the heat-drying layer formation step and the phase difference layer formation step, the heat-dried layer and the pattern alignment layer are exposed to the air for four hours or less.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: August 1, 2017
    Assignee: DAI NIPPON PRINTING CO., LTD.
    Inventors: Yuya Inomata, Kumiko Kambara, Masanori Fukuda, Hideki Usuki, Keiji Kashima, Kazuki Yamada
  • Patent number: 9638848
    Abstract: A pattern phase difference film is manufactured by a process including a laminate body formation step of applying a pattern alignment layer composition on a substrate to form a laminate body, a heat-drying layer formation step of heat-drying the composition to form a heat-dried layer, a pattern alignment layer formation step of irradiating a polarization pattern onto the heat-dried layer to form a pattern alignment layer, and a phase difference layer formation step of forming a phase difference layer including a rod-shaped compound on the pattern alignment layer. During the steps between the heat-drying layer formation step and the phase difference layer formation step, the heat-dried layer and the pattern alignment layer are exposed to the air for four hours or less.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: May 2, 2017
    Assignee: DAI NIPPON PRINTING CO., LTD.
    Inventors: Yuya Inomata, Kumiko Kambara, Masanori Fukuda, Hideki Usuki, Keiji Kashima, Kazuki Yamada
  • Patent number: 9551824
    Abstract: A light guide plate has a light exit surface, a back surface opposed to the light exit surface, and a light entrance surface consisting of at least part of a side surface. The light guide plate also has a body portion, and a light exit-side layer formed from an ionizing radiation curable resin. The light exit-side layer includes an optical element portion which defines the light exit surface. The optical element portion includes unit shaped elements arranged in one direction intersecting a light guide direction, each unit shaped element extending linearly in a direction intersecting the one direction.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: January 24, 2017
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Hiroshi Yamamoto, Hiroshi Sekiguchi, Masahiro Goto, Keiji Kashima
  • Publication number: 20160377775
    Abstract: A pattern phase difference film is manufactured by a process including a laminate body formation step of applying a pattern alignment layer composition on a substrate to form a laminate body, a heat-drying layer formation step of heat-drying the composition to form a heat-dried layer, a pattern alignment layer formation step of irradiating a polarization pattern onto the heat-dried layer to form a pattern alignment layer, and a phase difference layer formation step of forming a phase difference layer including a rod-shaped compound on the pattern alignment layer. During the steps between the heat-drying layer formation step and the phase difference layer formation step, the heat-dried layer and the pattern alignment layer are exposed to the air for four hours or less.
    Type: Application
    Filed: August 4, 2016
    Publication date: December 29, 2016
    Applicant: DAI NIPPON PRINTING CO., LTD.
    Inventors: Yuya INOMATA, Kumiko KAMBARA, Masanori FUKUDA, Hideki USUKI, Keiji KASHIMA, Kazuki YAMADA
  • Patent number: 9217925
    Abstract: A pattern phase difference film, which is used to display 3D images using a passive system, and provides a method for producing a pattern phase difference film that can be manufactured with high precision, easily and in large quantities. A mask, which has slits that are made narrow compared to the width of a region that is to undergo exposure treatment and are provided for exposure treatment, is manufactured.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: December 22, 2015
    Assignee: DAI NIPPON PRINTING CO., LTD.
    Inventors: Hiroyuki Nishimura, Yoshihide Nakao, Tomoya Kawashima, Kazuki Yamada, Keiji Kashima
  • Publication number: 20150260903
    Abstract: Sufficiently sharp directivity can be secured with a simple configuration in a configuration that improves the efficiency of utilizing the light exiting from a primary light source using a reflective polarizing plate. A backlight unit (2) supplies light exiting from an exit surface of a light guide plate (12) to a liquid-crystal display panel (3) via a reflective polarizing plate (16) after correcting directivity of the exiting light using a prism sheet (14) having a downwardly convex shape. A ¼-wavelength plate (15) is provided between the prism sheet (14) and the reflective polarizing plate (16), between the prism sheet (14) and the light guide plate, or between the light guide plate and a reflective sheet disposed on a surface of the light guide plate opposite to the prism sheet (14).
    Type: Application
    Filed: March 10, 2015
    Publication date: September 17, 2015
    Inventors: Keiji Kashima, Yasuki Suzuura, Hiroshi Yamamoto, Takashi Kuroda
  • Publication number: 20150168622
    Abstract: Disclosed is an infrared-ray reflective member which efficiently reflects infrared rays (heat rays) contained in sunlight while transmitting visible light rays. The infrared-ray reflective member has an infrared-ray reflective layer having a selective reflection layer for reflecting infrared rays of a right-circularly polarized light component or a left-circularly polarized light component, and the infrared-ray reflective layer has a first reflection band corresponding to a first radiant energy band containing a peak located closest to the short-wavelength side of the infrared range of the spectrum of sunlight on earth, and when the maximum reflectance in the first reflection band is determined at R1 and a wavelength in the short-wavelength side for allowing half-value reflectance of the R1 is determined at ?1, the ?1 is 900 nm to 1010 nm.
    Type: Application
    Filed: February 27, 2015
    Publication date: June 18, 2015
    Inventors: Satoru HAMADA, Shoji TAKESHIGE, Keiji KASHIMA, Takashi KURODA
  • Publication number: 20150168617
    Abstract: Disclosed is an infrared-ray reflective member which efficiently reflects infrared rays (heat rays) contained in sunlight while transmitting visible light rays. The infrared-ray reflective member has an infrared-ray reflective layer having a selective reflection layer for reflecting infrared rays of a right-circularly polarized light component or a left-circularly polarized light component, and the infrared-ray reflective layer has a first reflection band corresponding to a first radiant energy band containing a peak located closest to the short-wavelength side of the infrared range of the spectrum of sunlight on earth, and when the maximum reflectance in the first reflection band is determined at R1 and a wavelength in the short-wavelength side for allowing half-value reflectance of the R1 is determined at ?1, the ?1 is 900 nm to 1010 nm.
    Type: Application
    Filed: February 27, 2015
    Publication date: June 18, 2015
    Inventors: Satoru HAMADA, Shoji TAKESHIGE, Keiji KASHIMA, Takashi KURODA
  • Patent number: 8968836
    Abstract: Method for producing an electromagnetic wave reflective film by a first selective reflection layer forming process of using a transparent substrate; applying a first selective reflection layer forming coating solution on the transparent substrate to form a first selective reflection layer forming layer; irradiating the first selective reflection layer forming layer with ultraviolet rays at a dose in the range of 25 mJ/cm2 to 800 mJ/cm2; and thereby forming a first selective reflection layer; and a second selective reflection layer forming process of: using a second selective reflection layer forming coating solution; applying the second selective reflection layer forming coating solution on the first selective reflection layer so as to be in direct contact therewith to form a second selective reflection layer forming layer; irradiating the second selective reflection layer forming layer with ultraviolet rays; and thereby forming a second selective reflection layer.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: March 3, 2015
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Satoru Hamada, Shoji Takeshige, Keiji Kashima
  • Patent number: 8871410
    Abstract: The present invention pertains to a pattern phase difference film, which is used to display 3D images using a passive system, and provides a method for producing a pattern phase difference film that can be manufactured with high precision, easily and in large quantities. In a mask provided for manufacturing an alignment film, slits, which are provided for exposure treatment, are made so as to gradually narrow toward the ends in the longitudinal direction.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: October 28, 2014
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Hiroyuki Nishimura, Yoshihide Nakao, Tomoya Kawashima, Keiji Kashima
  • Publication number: 20140313581
    Abstract: A long patterned alignment film is provided, from which a large number of patterned retardation films can easily be produced, having an alignment layer which is in a long form and comprises an optical alignment material, wherein the alignment layer includes a first alignment region for causing a rodlike compound having a refractive index anisotropy to be arranged in a certain direction, and a second alignment region for causing the rodlike compound to be arranged in a direction different from the certain direction of the first alignment region.
    Type: Application
    Filed: September 13, 2012
    Publication date: October 23, 2014
    Applicant: DAI NIPPON PRINTING CO., LTD.
    Inventors: Keiji Kashima, Hiroyuki Nishimura, Masanori Fukuda, Yuugo Noritake
  • Publication number: 20140268002
    Abstract: A pattern phase difference film is manufactured by a process including a laminate body formation step of applying a pattern alignment layer composition on a substrate to form a laminate body, a heat-drying layer formation step of heat-drying the composition to form a heat-dried layer, a pattern alignment layer formation step of irradiating a polarization pattern onto the heat-dried layer to form a pattern alignment layer, and a phase difference layer formation step of forming a phase difference layer including a rod-shaped compound on the pattern alignment layer. During the steps between the heat-drying layer formation step and the phase difference layer formation step, the heat-dried layer and the pattern alignment layer are exposed to the air for four hours or less.
    Type: Application
    Filed: October 1, 2012
    Publication date: September 18, 2014
    Inventors: Yuya Inomata, Kumiko Kambara, Masanori Fukuda, Hideki Usuki, Keiji Kashima, Kazuki Yamada
  • Publication number: 20140253833
    Abstract: A phase difference layer laminated body used in a three-dimensional liquid crystal display device, wherein unit cells are divided into groups for left and right eyes, which are given different degrees of polarization, thereby creating a three-dimensional image, further wherein the phase difference layer laminated body has a base material having orientability, and a phase difference layer made of a liquid crystal material that can form a nematic phase and formed in a pattern with two different portions, and the liquid crystal material in each of two different portions is oriented to have different refractive index anisotropy each other that conforms to the two different degrees of polarization and fixed as it is.
    Type: Application
    Filed: May 19, 2014
    Publication date: September 11, 2014
    Applicant: DAI NIPPON PRINTING CO., LTD.
    Inventor: Keiji KASHIMA
  • Publication number: 20140199528
    Abstract: A pattern phase difference film, which is used to display 3D images using a passive system, and provides a method for producing a pattern phase difference film that can be manufactured with high precision, easily and in large quantities. A mask, which has slits that are made narrow compared to the width of a region that is to undergo exposure treatment and are provided for exposure treatment, is manufactured.
    Type: Application
    Filed: August 29, 2012
    Publication date: July 17, 2014
    Applicant: DAI NIPPON PRINTING CO., LTD.
    Inventors: Hiroyuki Nishimura, Yoshihide Nakao, Tomoya Kawashima, Kazuki Yamada, Keiji Kashima
  • Publication number: 20140178597
    Abstract: The present invention pertains to a pattern phase difference film, which is used to display 3D images using a passive system, and provides a method for producing a pattern phase difference film that can be manufactured with high precision, easily and in large quantities. In a mask provided for manufacturing an alignment film, slits, which are provided for exposure treatment, are made so as to gradually narrow toward the ends in the longitudinal direction.
    Type: Application
    Filed: August 2, 2012
    Publication date: June 26, 2014
    Applicant: DAI NIPPON PRINTING CO., LTD.
    Inventors: Hiroyuki Nishimura, Yoshihide Nakao, Tomoya Kawashima, Keiji Kashima
  • Patent number: 8659738
    Abstract: A phase difference layer laminated body used in a three-dimensional liquid crystal display device, wherein unit cells are divided into groups for left and right eyes, which are given different degrees of polarization, thereby creating a three-dimensional image, further wherein the phase difference layer laminated body has a base material having orientability, and a phase difference layer made of a liquid crystal material that can form a nematic phase and formed in a pattern with two different portions, and the liquid crystal material in each of two different portions is oriented to have different refractive index anisotropy each other that conforms to the two different degrees of polarization and fixed as it is.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: February 25, 2014
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventor: Keiji Kashima
  • Patent number: 8659711
    Abstract: A phase difference layer laminated body used in a three-dimensional liquid crystal display device, wherein unit cells are divided into groups for left and right eyes, which are given different degrees of polarization, thereby creating a three-dimensional image, further wherein the phase difference layer laminated body has a base material having orientability, and a phase difference layer made of a liquid crystal material that can form a nematic phase and formed in a pattern with two different portions, and the liquid crystal material in each of two different portions is oriented to have different refractive index anisotropy each other that conforms to the two different degrees of polarization and fixed as it is.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: February 25, 2014
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventor: Keiji Kashima