Patents by Inventor Michihiro Yamaki

Michihiro Yamaki 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).

  • Fully automatic diaphragm control interchangeable lens
    Patent number: 4647171
    Abstract: An interchangeable variable aperture lens can be used as an automatic lens with a camera body using digital signal control and with a camera body using analog signal control, and as a manual lens. The lens has both digital and analogue circuits for providing signals, to different camera bodies, indicative of the full open and full closed values of the lens diaphragm. Digital and analogue signal contacts are so positioned on the lens that the coacting contacts of different camera bodies are engaged when the lens is mounted on the different bodies, provided that the mechanical mount is the same.
    Type: Grant
    Filed: May 16, 1985
    Date of Patent: March 3, 1987
    Assignee: Sigma Corporation
    Inventor: Michihiro Yamaki