Patents by Inventor Koji Umezaki

Koji Umezaki 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).

  • Method of manufacturing optical device
    Patent number: 9272308
    Abstract: A method of manufacturing an optical device that includes a relief structure formation layer, a first layer made of a first material having a refractive index different from that of a material of the relief structure formation layer, and a second layer made of a second material different from the first material and covering the first layer. A ratio of an amount of the second material at a position of the second region to an apparatus area of the second region is zero or smaller than a ratio of an amount of the second material at the position of the second sub-region to an apparatus area of the second sub region.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 1, 2016
    Assignee: TOPPAN PRINTING CO., LTD.
    Inventors: Kazuhiro Yashiki, Chikara Sawamura, Koji Umezaki, Akira Kubo
  • OPTICAL DEVICE AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20120064303
    Abstract: An optical device includes a relief structure formation layer, a first layer made of a first material having a refractive index different from that of a material of the relief structure formation layer, and a second layer made of a second material different from the first material and covering the first layer. A ratio of an amount of the second material at a position of the second region to an apparatus area of the second region is zero or smaller than a ratio of an amount of the second material at the position of the second sub-region to an apparatus area of the second sub-region.
    Type: Application
    Filed: November 22, 2011
    Publication date: March 15, 2012
    Applicant: TOPPAN PRINTING CO., LTD
    Inventors: Kazuhiro YASHIKI, Chikara Sawamura, Koji Umezaki, Akira Kubo