Patents by Inventor Yukihiro Tao

Yukihiro Tao 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).

  • Publication number: 20180275505
    Abstract: A transparent screen sheet that displays images projected from a front side of the transparent screen sheet and/or a rear side of the transparent screen sheet to a user on the front side, and causes the user on the front side to view a rear background behind the rear side. The transparent screen sheet includes an image display layer configured to display the images; and a resin film that holds the image display layer. A difference between a maximum value and a minimum value of retardations of the resin film measured by irradiating a main surface of the resin film with a light with a wavelength of 460 nm in a direction orthogonal to the main surface, within a region on the main surface that overlaps with the image display layer, is one fourth of the wavelength of the light or less.
    Type: Application
    Filed: May 25, 2018
    Publication date: September 27, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Yukihiro TAO, Kenta Sekikawa, Yuriko Kaida
  • Publication number: 20180239066
    Abstract: To provide an image projecting structure having a wide viewing angle and whereby the visibility of a projected image is high. The image projecting structure comprises a first transparent layer having irregularities formed on its surface, a reflective film formed on the surface on which the irregularities are formed, of the first transparent layer, and a second transparent layer formed on the reflective film, wherein the transmittance of visible light is from 5 to 95%; the value obtained by dividing the haze by the diffuse reflectance of visible light is at least 0.1 and at most 1; the vertical difference Sk in the core section defined by ISO 25178, of the surface on which the irregularities are formed, is at least 0.1 ?m; and the value obtained by dividing the shortest autocorrelation length Sal by the vertical difference Sk in the core section is at least 1.2 and at most 190.
    Type: Application
    Filed: March 27, 2018
    Publication date: August 23, 2018
    Applicant: Asahi Glass Company, Limited
    Inventors: Yuko TACHIBANA, Yukihiro Tao, Kenta Sekikawa
  • Publication number: 20180188643
    Abstract: A transparent screen includes a plurality of transparent plates arranged in a front-rear direction; and a screen main body, interposed between the transparent plates, configured to display video images projected from a front side or a rear side of the transparent screen to a user on the front side, and enable a rear background to be visually recognized by the user. In a cross section orthogonal to a part of an outer edge of the transparent screen, the transparent screen has a curved shape, and a length of a center line in a plate thickness direction of the transparent plate on an external side of the screen main body in a curvature radius direction of the curved shape is greater than a length of a center line of the transparent plate on an internal side of the screen main body.
    Type: Application
    Filed: February 27, 2018
    Publication date: July 5, 2018
    Applicant: Asahi Glass Company, Limited
    Inventors: Ryuichi SHIRAISHI, Yuriko KAIDA, Yoshinori IGUCHI, Yukihiro TAO
  • Patent number: 9952494
    Abstract: A video projecting structure includes a substrate having a visible light transmittance greater than or equal to 5% and less than or equal to 90%, a reflectivity greater than or equal to 5% and less than or equal to 90%, and a front haze less than or equal to 30.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: April 24, 2018
    Assignee: Asahi Glass Company, Limited
    Inventors: Yukihiro Tao, Kenta Sekikawa, Hitoshi Tsujimura, Kenichi Ebata, Yuriko Kaida
  • Patent number: 9946147
    Abstract: To provide a transmission-type transparent screen which is excellent in the see-through property for a scene on the other side of the transparent screen as viewed from an observer in a state where no image-forming light is projected from a projector and which is excellent in visibility of an image displayed on the transparent screen as viewed from the observer in a state where image-forming light is projected from the projector, as well as an image display system and an image display method, employing the transparent screen. A transmission-type transparent screen 1 which has a first surface A and a second surface B on the opposite side thereof and which has a light scattering layer 34 comprising a transparent resin 32 and a light scattering material 33, wherein the light scattering layer 34 further contains a light absorbing material, the haze is from 3 to 30%, the total light transmittance is from 15 to 95%, and the diffuse reflectance is from 0.1 to 2.4%.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: April 17, 2018
    Assignee: Asahi Glass Company, Limited
    Inventors: Masamichi Ide, Yukihiro Tao, Kenta Sekikawa, Hitoshi Tsujimura, Yuriko Kaida
  • Patent number: 9921371
    Abstract: A light guide element includes a light-guiding substrate and a diffraction part formed on a surface of the light-guiding substrate. The diffraction part includes an optical layer capable of exerting a diffractive action. The distance from the light-guiding substrate to a surface of the optical layer is equal to or less than 10% of a thickness of the light-guiding substrate. The light guide element satisfies |?D|?0.15 mm, where ?D is an amount of a change in D with the temperature change ?T, D [mm] is a distance, at the temperature T (° C.), between the center of the diffraction part and a position predetermined as a position where the ray of light comes out of the light-guiding substrate in a direction horizontal with respect to the light-guiding substrate, and ?T is a temperature change.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: March 20, 2018
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Koji Miyasaka, Yukihiro Tao, Kosuke Takayama
  • Patent number: 9921463
    Abstract: A video projecting structure includes a substrate having a visible light transmittance greater than or equal to 5% and less than or equal to 90%, a front haze greater than or equal to 4 and less than or equal to 40, and a rear haze greater than or equal to 0 and less than or equal to 60. In a case where light is incident on a surface of the substrate at an angle of 45°, an intensity of a backward scattering light is lower than an intensity of a frontward scattering light.
    Type: Grant
    Filed: November 25, 2016
    Date of Patent: March 20, 2018
    Assignee: Asahi Glass Company, Limited
    Inventors: Yukihiro Tao, Kenta Sekikawa, Hitoshi Tsujimura, Kenichi Ebata, Yuriko Kaida
  • Publication number: 20170205701
    Abstract: To provide a transmission-type transparent screen which is excellent in the see-through property for a scene on the other side of the transparent screen as viewed from an observer in a state where no image-forming light is projected from a projector and which is excellent in visibility of an image displayed on the transparent screen as viewed from the observer in a state where image-forming light is projected from the projector, as well as an image display system and an image display method, employing the transparent screen. A transmission-type transparent screen 1 which has a first surface A and a second surface B on the opposite side thereof and which has a light scattering layer 34 comprising a transparent resin 32 and a light scattering material 33, wherein the light scattering layer 34 further contains a light absorbing material, the haze is from 3 to 30%, the total light transmittance is from 15 to 95%, and the diffuse reflectance is from 0.1 to 2.4%.
    Type: Application
    Filed: April 4, 2017
    Publication date: July 20, 2017
    Applicant: Asahi Glass Company, Limited
    Inventors: Masamichi IDE, Yukihiro Tao, Kenta Sekikawa, Hitoshi Tsujimura, Yuriko Kaida
  • Publication number: 20170082915
    Abstract: A video projecting structure includes a substrate having a visible light transmittance greater than or equal to 5% and less than or equal to 90%, a reflectivity greater than or equal to 5% and less than or equal to 90%, and a front haze less than or equal to 30.
    Type: Application
    Filed: December 1, 2016
    Publication date: March 23, 2017
    Applicant: Asahi Glass Company, Limited
    Inventors: Yukihiro TAO, Kenta SEKIKAWA, Hitoshi TSUJIMURA, Kenichi EBATA, Yuriko KAIDA
  • Publication number: 20170075207
    Abstract: A video projecting structure includes a substrate having a visible light transmittance greater than or equal to 5% and less than or equal to 90%, a front haze greater than or equal to 4 and less than or equal to 40, and a rear haze greater than or equal to 0 and less than or equal to 60. In a case where light is incident on a surface of the substrate at an angle of 45° an intensity of a backward scattering light is lower than an intensity of a frontward scattering light.
    Type: Application
    Filed: November 25, 2016
    Publication date: March 16, 2017
    Applicant: Asahi Glass Company, Limited
    Inventors: Yukihiro TAO, Kenta SEKIKAWA, Hitoshi TSUJIMURA, Kenichi EBATA, Yuriko KAIDA
  • Publication number: 20160349517
    Abstract: A light guide element includes a light-guiding substrate and a diffraction part formed on a surface of the light-guiding substrate. The diffraction part includes an optical layer capable of exerting a diffractive action. The distance from the light-guiding substrate to a surface of the optical layer is equal to or less than 10% of a thickness of the light-guiding substrate. The light guide element satisfies |?D|?0.15 mm, where ?D is an amount of a change in D with the temperature change ?T, D [mm] is a distance, at the temperature T (° C.), between the center of the diffraction part and a position predetermined as a position where the ray of light comes out of the light-guiding substrate in a direction horizontal with respect to the light-guiding substrate, and ?T is a temperature change.
    Type: Application
    Filed: August 11, 2016
    Publication date: December 1, 2016
    Applicant: Asahi Glass Company, Limited
    Inventors: Koji MIYASAKA, Yukihiro TAO, Kosuke TAKAYAMA
  • Patent number: 8300512
    Abstract: A liquid crystal element includes: a transparent substrate; and a liquid crystal layer including: a liquid crystal material; and a concavo-convex portion including periodic concaves and convexes, wherein the concavo-convex portion is aligned so that a longitudinal direction of liquid crystal molecules that are positioned on a side of the transparent substrate and on a concavo-convex surface that is an interface of the concavo-convex portion substantially becomes a vertical direction with respect to a concavo-convex surface on the side of the transparent substrate, or a longitudinal direction of liquid crystal molecules that are positioned on a side, in which a medium is disposed and which is opposite to the transparent substrate, and on the concavo-convex surface that is the interface of the concavo-convex portion substantially becomes the vertical direction with respect to a concavo-convex surface on the side, in which the medium is disposed, to form a diffraction grating.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: October 30, 2012
    Assignee: Asahi Glass Company, Limited
    Inventors: Yukihiro Tao, Kenichi Yuyama
  • Patent number: 8040781
    Abstract: An optical rotating plate has an optical rotating material layer. A phase plate is provided on a first surface side of the optical rotating plate and has at least one birefringent material layer. The first surface side is disposed toward an emitting side of an optical path, thereby giving different phase differences to a first linearly polarized light group containing at least a linearly polarized light having a first wavelength and a second linearly polarized light group containing at least a linearly polarized light having a second wavelength which is different from the first wavelength.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: October 18, 2011
    Assignee: Asahi Glass Company, Limited
    Inventors: Yukihiro Tao, Hiromasa Sato, Atsushi Koyanagi, Koji Miyasaka
  • Publication number: 20100260030
    Abstract: A liquid crystal element includes: a transparent substrate; and a liquid crystal layer including: a liquid crystal material; and a concavo-convex portion including periodic concaves and convexes, wherein the concavo-convex portion is aligned so that a longitudinal direction of liquid crystal molecules that are positioned on a side of the transparent substrate and on a concavo-convex surface that is an interface of the concavo-convex portion substantially becomes a vertical direction with respect to a concavo-convex surface on the side of the transparent substrate, or a longitudinal direction of liquid crystal molecules that are positioned on a side, in which a medium is disposed and which is opposite to the transparent substrate, and on the concavo-convex surface that is the interface of the concavo-convex portion substantially becomes the vertical direction with respect to a concavo-convex surface on the side, in which the medium is disposed, to form a diffraction grating.
    Type: Application
    Filed: June 25, 2010
    Publication date: October 14, 2010
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Yukihiro TAO, Kenichi Yuyama
  • Patent number: 7755834
    Abstract: The present invention provides a wavelength-selective diffraction element, configured such that light having a plurality of wavelengths are incident thereon as incident light, which is provided with: a transparent substrate; a concavo-convex part, formed on the transparent substrate such that concave portions and convex portions are cyclically extended in one direction, and comprised of a first material which is optically isotropic; and a filling part, filling at least the concave portions and comprised of a second material which is optically isotropic. The first material and the second material have no absorbance with respect to the wavelengths of the incident light. The first material and the second material have an identical refractive index with respect to light having a first wavelength which is at least one of the wavelengths of the incident light.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: July 13, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Atsushi Koyanagi, Hiromasa Sato, Yukihiro Tao, Koji Miyasaka
  • Publication number: 20100091634
    Abstract: In an optical head device that subjects light exiting from a light source to reflection on an information recording layer of an optical disk, to thus guide the light to a photodetector, an optical attenuation device is disposed in an optical path from the optical disk to the photodetector, wherein the optical attenuation device has a first region having high transmissivity, a second region having low transmissivity, and a third region having an intermediate value of transmissivity, whereby light returned from a layer differing from the information recording layer, which will be responsible for crosstalk, is reduced by mean of the photodetector.
    Type: Application
    Filed: October 6, 2009
    Publication date: April 15, 2010
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Koichi MURATA, Koji Miyasaka, Yukihiro Tao
  • Publication number: 20090268585
    Abstract: An optical rotating plate has an optical rotating material layer. A phase plate is provided on a first surface side of the optical rotating plate and has at least one birefringent material layer. The first surface side is disposed toward an emitting side of an optical path, thereby giving different phase differences to a first linearly polarized light group containing at least a linearly polarized light having a first wavelength and a second linearly polarized light group containing at least a linearly polarized light having a second wavelength which is different from the first wavelength.
    Type: Application
    Filed: July 2, 2009
    Publication date: October 29, 2009
    Applicant: Asahi Glass Company, Limited
    Inventors: Yukihiro TAO, Hiromasa SATO, Atsushi KOYANAGI, Koji MIYASAKA
  • Publication number: 20090016191
    Abstract: It is provided an optical head device which includes: a light source; an objective lens, configured to converge light emitted from the light source to an information recording surface of an optical disk; a beam splitter, configured to deflect returned light reflected by the optical disk into an optical path which is different from an optical path of the light emitted from the light source; a photo detector, configured to detect the returned light deflected by the beam splitter; and a depolarizing element, disposed on an optical path between the beam splitter and the photo detector, and configured to cause the returned light to transmit through while reducing a degree of polarization of the returned light.
    Type: Application
    Filed: September 16, 2008
    Publication date: January 15, 2009
    Applicant: Asahi Glass Company, Limited
    Inventors: Koichi MURATA, Yoshiharu OOI, Yukihiro TAO, Koji MIYASAKA
  • Publication number: 20080316600
    Abstract: The present invention provides a wavelength-selective diffraction element, configured such that light having a plurality of wavelengths are incident thereon as incident light, which is provided with: a transparent substrate; a concavo-convex part, formed on the transparent substrate such that concave portions and convex portions are cyclically extended in one direction, and comprised of a first material which is optically isotropic; and a filling part, filling at least the concave portions and comprised of a second material which is optically isotropic. The first material and the second material have no absorbance with respect to the wavelengths of the incident light. The first material and the second material have an identical refractive index with respect to light having a first wavelength which is at least one of the wavelengths of the incident light.
    Type: Application
    Filed: June 16, 2008
    Publication date: December 25, 2008
    Applicant: Asahi Glass Company, Limited
    Inventors: Atsushi KOYANAGI, Hiromasa SATO, Yukihiro TAO, Koji MIYASAKA
  • Patent number: 6572771
    Abstract: An apparatus for treatment of fluorine waste water has an introduction tank, a main treatment tank, a calcium hydroxide tank, a polychlorinated aluminum tank, a macromolecular flocculant tank, a settling tank, and a concentration tank. Fluorine waste water is introduced through the introduction tank into a lower part of the main treatment tank through a lower inlet pipe. Also, return sludge from the concentration tank and silicon sludge from a silicon waste water treatment system are introduced into an upper part of the main treatment tank. Thus, silicon recovered from silicon waste water is recycled for treatment of fluorine waste water. Also, unreacted chemicals, which have been loaded in the calcium hydroxide tank, polychlorinated aluminum tank, macromolecular flocculant tank, are recycled. The main treatment tank has no stirrer, and thus conserves electrical energy, but can neutralize the waste water.
    Type: Grant
    Filed: June 4, 2002
    Date of Patent: June 3, 2003
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kazuyuki Yamasaki, Kazumi Chujo, Seiji Okamoto, Yukihiro Tao