Patents by Inventor Yuji Abrakawa

Yuji Abrakawa 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).

  • Optics of wearable display using laser beam scanner
    Patent number: 11073694
    Abstract: A see-through image display system having a laser-beam-scanner has a very small eyebox when a laser beam is directly projected into eye. This invention provides a solution to increase the size of eyebox using a free-form-mirror to create a real image with high NA without exit-pupil-expander.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: July 27, 2021
    Assignees: NTT DOCOMO, Inc.
    Inventors: Fusao Ishii, Mikiko Nakanishi, Kazuhiko Takahashi, Yuji Abrakawa, Keiichi Murakami
  • OPTICS OF WEARABLE DISPLAY TO INCREASE EYE-BOX
    Publication number: 20200409143
    Abstract: A see-through image display system having an Exit-Pupil-Expander (EPE) to enlarge the eyebox of display is disclosed. The EPE uses a hologram functioning as a micro-lens-array as well as collimation lens.
    Type: Application
    Filed: December 14, 2017
    Publication date: December 31, 2020
    Inventors: Fusao Ishii, Mikiko Nakanishi, Kazuhiko Takahashi, Yuji Abrakawa, Keiichi Murakami
  • OPTICS OF WEARABLE DISPLAY USING LASER BEAM SCANNER
    Publication number: 20200271931
    Abstract: A see-through image display system having a laser-beam-scanner has a very small eyebox when a laser beam is directly projected into eye. This invention provides a solution to increase the size of eyebox using a free-form-mirror to create a real image with high NA without exit-pupil-expander.
    Type: Application
    Filed: December 15, 2017
    Publication date: August 27, 2020
    Inventors: Fusao Ishii, Mikiko Nakanishi, Kazuhiko Takahashi, Yuji Abrakawa, Keiichi Murakami
  • GHOST IMAGE ELIMINATION OF DOE USING FOURIER OPTICS METHOD
    Publication number: 20180275333
    Abstract: A see-through image display system having a DOE often has undesirable light or so called ghost images due to the quantization of saw tooth shape of DOE surface. This invention provides ways to eliminate ghost images.
    Type: Application
    Filed: December 15, 2017
    Publication date: September 27, 2018
    Inventors: Fusao Ishii, Mikiko Nakanishi, Kazuhiko Takahashi, Yuji Abrakawa, Keiichi Murakami