Patents by Inventor Koichi TASHIMA

Koichi TASHIMA 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).

  • Homogenizer, illuminating optical system, and illuminator
    Patent number: 11378877
    Abstract: A homogenizer includes a convex-lens array pair including a first convex-lens array disposed on a light entrance side and a second convex-lens array disposed on a light emission side. The first convex-lens array and the second convex-lens array are disposed so as to face each other such that each of the convex-lens arrays has a lens surface opposed to each other outward or inward. The first convex-lens array includes a plurality of first convex lenses in an array arrangement. The second convex-lens array includes a plurality of second convex lenses in an array arrangement. The first convex lens has an average internal transmission angle for incident light entering a lens-surface center region in the lens cross-section and being in parallel with the symmetry axis being equal to or more than 1.3 times an average internal transmission angle of a spherical convex lens.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: July 5, 2022
    Assignee: AGC INC.
    Inventors: Yoshiharu Ooi, Koichi Tashima, Kensuke Ono, Atsushi Koyanagi
  • DIFFRACTIVE OPTICAL ELEMENT, PROJECTION DEVICE, AND MEASURING DEVICE
    Publication number: 20210356755
    Abstract: A diffractive optical element includes a unit structure periodically arranged in a first direction and configured to diffract incident light in the first direction. The diffractive optical element has a phase pattern designed such that an angular separation between an outermost diffracted light beam and a second-outermost diffracted light beam along the first direction is smaller than the divergence angle of the incident light.
    Type: Application
    Filed: July 29, 2021
    Publication date: November 18, 2021
    Applicant: AGC Inc.
    Inventors: Toshiya YONEHARA, Ryota MURAKAMI, Koichi TASHIMA, Kensuke ONO
  • HOMOGENIZER, ILLUMINATING OPTICAL SYSTEM, AND ILLUMINATOR
    Publication number: 20210003911
    Abstract: A homogenizer includes a convex-lens array pair including a first convex-lens array disposed on a light entrance side and a second convex-lens array disposed on a light emission side. The first convex-lens array and the second convex-lens array are disposed so as to face each other such that each of the convex-lens arrays has a lens surface opposed to each other outward or inward. The first convex-lens array includes a plurality of first convex lenses in an array arrangement. The second convex-lens array includes a plurality of second convex lenses in an array arrangement. The first convex lens has an average internal transmission angle for incident light entering a lens-surface center region in the lens cross-section and being in parallel with the symmetry axis being equal to or more than 1.3 times an average internal transmission angle of a spherical convex lens.
    Type: Application
    Filed: September 15, 2020
    Publication date: January 7, 2021
    Applicant: AGC INC.
    Inventors: Yoshiharu OOI (Deceased), Koichi TASHIMA, Kensuke ONO, Atsushi KOYANAGI