Patents by Inventor Akio Umeda

Akio Umeda 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).

  • Ocular refracting power measuring system
    Patent number: 5071245
    Abstract: An ocular refracting power measuring system includes a projector system for projecting the image of a light source on the eyeground of an eye to be tested and a light receiving system for condensing the light beam from the eyeground onto a light receiving element disposed at a position substantially conjugate with the pupil of the eye to be tested, whereby the ocular refracting power of the eye to be tested can be measured based on the distribution of light amount on the light receiving element and variations of the distribution of light amount due to the changed amount of light in the light source.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: December 10, 1991
    Assignee: Kabushiki Kaisha TOPCON
    Inventors: Yasufumi Fukuma, Akio Umeda, Ikuo Kitao, Noriyuki Nagai, Yasuhisa Ishikura, Kazutoshi Uchida