Patents by Inventor Katsuaki Ohtawa

Katsuaki Ohtawa 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).

  • Light guide device
    Patent number: 11022742
    Abstract: A light guide device includes a light guide plate that induces a light emission of a light source. The light guide plate includes an incident portion that is incident light emitted from a light source, a reflecting portion that reflects the light from the incident portion to an inside of the light guide plate, and an emitting portion that emits the light from the reflecting portion to an outside of the light guide plate. The emitting portion is provided in a thin elongated shape on a first portion of a circumferential surface of the light guide plate. The reflecting portion includes an expansion surface that expands the light from the incident portion to a circumferential direction of the light guide plate.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: June 1, 2021
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Katsuaki Ohtawa, Kimiaki Yoshino
  • LIGHT GUIDE DEVICE
    Publication number: 20190187359
    Abstract: A light guide device includes a light guide plate that induces a light emission of a light source. The light guide plate includes an incident portion that is incident light emitted from a light source, a reflecting portion that reflects the light from the incident portion to an inside of the light guide plate, and an emitting portion that emits the light from the reflecting portion to an outside of the light guide plate. The emitting portion is provided in a thin elongated shape on a first portion of a circumferential surface of the light guide plate. The reflecting portion includes an expansion surface that expands the light from the incident portion to a circumferential direction of the light guide plate.
    Type: Application
    Filed: December 7, 2018
    Publication date: June 20, 2019
    Inventors: Katsuaki Ohtawa, Kimiaki Yoshino