Patents by Inventor Hirotaka Nashi

Hirotaka Nashi 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: 8040778
    Abstract: A grating portion has a plurality of convex portions provided on at least one principal plane of a transparent substrate having a first layer containing a first transparent material and a second layer containing a second transparent material, and extended in parallel to each other in a first direction as well as periodically arranged in a second direction orthogonal to the first direction. A filling portion fills a third layer containing a third transparent material at least between the plurality of convex portions. Assuming that the change rate of the refractive index with the change of temperature of the first transparent material is ?A, the change rate of the refractive index with the change of temperature of the second transparent material is ?B, and the change rate of the refractive index with the change of temperature of the third transparent material is ?C, the relationship ?A<?C<0 and |?C|>|?B| is satisfied.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: October 18, 2011
    Assignee: Asahi Glass Company, Limited
    Inventor: Hirotaka Nashi
  • Publication number: 20090190458
    Abstract: A grating portion has a plurality of convex portions provided on at least one principal plane of a transparent substrate having a first layer containing a first transparent material and a second layer containing a second transparent material, and extended in parallel to each other in a first direction as well as periodically arranged in a second direction orthogonal to the first direction. A filling portion fills a third layer containing a third transparent material at least between the plurality of convex portions. Assuming that the change rate of the refractive index with the change of temperature of the first transparent material is ?A, the change rate of the refractive index with the change of temperature of the second transparent material is ?B, and the change rate of the refractive index with the change of temperature of the third transparent material is ?C, the relationship ?A<?C<0 and |?C|>|?B| is satisfied.
    Type: Application
    Filed: April 10, 2009
    Publication date: July 30, 2009
    Applicant: ASAHI GLASS COMPANY LIMITED
    Inventor: Hirotaka NASHI
  • Patent number: 7142363
    Abstract: A diffraction element having high diffraction efficiency and large wavelength-separation effect, which is excellent in mass-productivity and is formed by a simple process, is obtained. In a diffraction element having a rectangular grating formed in a surface of a transparent substrate whose cross-section is of an alternating recessed and projecting shape and each of the projecting portions is symmetrical, the period of the grating is equal to or smaller than the wavelength of incident light and the diffraction element is adopted so that the light is incident obliquely to its surface where the grating is formed.
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: November 28, 2006
    Assignee: Asahi Glass Company, Limited
    Inventors: Hiromasa Sato, Hirotaka Nashi
  • Publication number: 20060001972
    Abstract: A diffraction element having high diffraction efficiency and large wavelength-separation effect, which is excellent in mass-productivity and is formed by a simple process, is obtained. In a diffraction element 30 having a rectangular grating 302 formed in a surface of a transparent substrate 301 whose cross-section is a concave/convex like shape and each of the convex portions is symmetrical, the period of the grating is equal to or smaller than the wavelength of incident light and the diffraction element 30 is adopted so that the light is incident obliquely to its surface where the grating is formed.
    Type: Application
    Filed: September 13, 2005
    Publication date: January 5, 2006
    Applicant: Asahi Glass Company, Limited
    Inventors: Hiromasa Sato, Hirotaka Nashi