Patents by Inventor Takayuki ISHIGAME

Takayuki ISHIGAME 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).

  • Projection optical system and image display device with refractive optical system to form an image on a receiving surface
    Patent number: 11868035
    Abstract: The present invention aims to provide a projection optical system that projects an image displayed on an image display surface of an image display element in an enlarged manner on a projection receiving surface as a projection image, the projection optical system comprising: a refractive optical system and a refractive/reflective optical element arranged in sequence from near the image display surface toward the projection receiving surface, wherein the refractive optical system includes a plurality of lenses, wherein the refractive/reflective optical element includes an optical element unit that includes a reflection surface member including a reflection surface, and a refractive medium portion that is in tight contact with the reflection surface, the refractive medium portion includes an incidence surface and an emergence surface, and the reflection surface is a curved surface having refractive power, and wherein an image-forming light beam emerging from the refractive optical system is caused to enter the
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: January 9, 2024
    Assignee: RICOH INDUSTRIAL SOLUTIONS INC.
    Inventor: Takayuki Ishigame
  • PROJECTION OPTICAL SYSTEM AND IMAGE DISPLAY DEVICE
    Publication number: 20210033829
    Abstract: The present invention aims to provide a projection optical system that projects an image displayed on an image display surface of an image display element in an enlarged manner on a projection receiving surface as a projection image, the projection optical system comprising: a refractive optical system and a refractive/reflective optical element arranged in sequence from near the image display surface toward the projection receiving surface, wherein the refractive optical system includes a plurality of lenses, wherein the refractive/reflective optical element includes an optical element unit that includes a reflection surface member including a reflection surface, and a refractive medium portion that is in tight contact with the reflection surface, the refractive medium portion includes an incidence surface and an emergence surface, and the reflection surface is a curved surface having refractive power, and wherein an image-forming light beam emerging from the refractive optical system is caused to enter the
    Type: Application
    Filed: January 29, 2019
    Publication date: February 4, 2021
    Applicant: RICOH INDUSTRIAL SOLUTIONS INC.
    Inventor: Takayuki ISHIGAME