Patents by Inventor Youichi Iwasaki

Youichi Iwasaki 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).

  • Automatic focusing device
    Patent number: 4623237
    Abstract: An automatic focusing device having a light projecting device, a light receiving device arranged to detect a reflection light quantity reflected by an object to be photographed as a result of light projection by the light projecting device and a distance measuring device arranged to measure a distance to the object by the reflection light quantity received by the light receiving device is capable of adequately performing a focusing operation even in cases where the reflection light quantity is at a level too low for the distance measuring device to give any result of distance measurement.
    Type: Grant
    Filed: July 3, 1985
    Date of Patent: November 18, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naoya Kaneda, Youichi Iwasaki, Masamichi Tohyama