Patents by Inventor Yasuyuki KIYAMA

Yasuyuki KIYAMA 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: 20220206252
    Abstract: A projection system includes a first optical system and a second optical system. The second optical system includes a first lens group disposed on an enlargement side of an intersection position where a chief ray of an off-axis beam having a maximum angle of view intersects with an optical axis of the projection system in the second optical system, a second lens group disposed on the reduction side of the intersection position and having negative power, and a third lens group disposed on the reduction side of the second lens group and having positive power. The second lens group includes a first lens having positive power, a second lens disposed on the reduction side of the first lens and having positive power, and a third lens disposed on the reduction side of the second lens and having negative power. The third lens group includes two lenses each having positive power.
    Type: Application
    Filed: December 23, 2021
    Publication date: June 30, 2022
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Yasuyuki KIYAMA, Hitoshi HIRANO, Nobutaka MINEFUJI, Koji SHIOKAWA