Patents by Inventor Kasao Jyojiki

Kasao Jyojiki 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).

  • Focus detecting device
    Patent number: 4408853
    Abstract: A focus detecting device comprising split prisms between an optical lens and an object image formed on the focal plane of the lens. The image is divided into two images and a plurality of light receiving elements or two arrays are disposed on the image forming surface. The outputs of the elements or arrays are processed to provide an electrical signal indicative of focus status.
    Type: Grant
    Filed: October 27, 1978
    Date of Patent: October 11, 1983
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Seijiro Tokutomi, Kazuo Nakamura, Kasao Jyojiki