Patents by Inventor Masaru Wakui

Masaru Wakui 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).

  • Halftone image generation method, threshold matrix generation method, threshold matrix, printing plate manufacturing method, and printing plate
    Patent number: 8111428
    Abstract: In a halftone image formed on a printing plate for letterpress printing, a minimum halftone dot has a square main cluster consisting of 9 pixels and four sub-clusters located around the main cluster radially, each of which is one pixel. Each sub-cluster contacts with only a vertex of the main cluster. Convex portions corresponding to the minimum halftone dots in the halftone image are formed on the printing plate. A convex portion corresponding to the main cluster is supported by convex portions corresponding to the sub-clusters to increase the strength of relief corresponding to the minimum halftone dot. Reliefs corresponding to the minimum halftone dots are normally formed regardless of a dot area rate of highlight area to thereby improve reproduction in printing of the halftone image.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: February 7, 2012
    Assignee: Dainippon Screen Mfg. Co., Ltd.
    Inventors: Hiroshi Asai, Yuji Kurokawa, Masaru Wakui
  • HALFTONE IMAGE GENERATION METHOD, THRESHOLD MATRIX GENERATION METHOD, THRESHOLD MATRIX, PRINITNG PLATE MANUFACTURING METHOD, AND PRINTING PLATE
    Publication number: 20090262398
    Abstract: In a halftone image formed on a printing plate for letterpress printing, a minimum halftone dot has a square main cluster consisting of 9 pixels and four sub-clusters located around the main cluster radially, each of which is one pixel. Each sub-cluster contacts with only a vertex of the main cluster. Convex portions corresponding to the minimum halftone dots in the halftone image are formed on the printing plate. A convex portion corresponding to the main cluster is supported by convex portions corresponding to the sub-clusters to increase the strength of relief corresponding to the minimum halftone dot. Reliefs corresponding to the minimum halftone dots are normally formed regardless of a dot area rate of highlight area to thereby improve reproduction in printing of the halftone image.
    Type: Application
    Filed: March 5, 2009
    Publication date: October 22, 2009
    Inventors: Hiroshi ASAI, Yuji KUROKAWA, Masaru Wakui