Patents by Inventor Hiroyoshi Kawana

Hiroyoshi Kawana 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).

  • Exposure control device for camera
    Patent number: 4131350
    Abstract: The present invention relates to an exposure control device for a camera for obtaining a proper exposure taking the differences of the films to be used into consideration, so designed that an exposure amount control circuit for controlling an exposure amount by means of a first light measuring circuit for measuring the light reflected from the film plane is provided, while a second light measuring circuit for measuring the light reflected from the shutter plane and/or the film plane is provided in such a manner that by means of the output of the second light measuring circuit the control output value of the exposure amount control circuit is compensated so as to obtain a proper exposure amount.
    Type: Grant
    Filed: October 6, 1977
    Date of Patent: December 26, 1978
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Uchiyama, Ryoichi Suzuki, Tokuichi Tsunekawa, Hiroyoshi Kawana, Yusuke Ono, Mutsuhide Matsuda