Patents by Inventor Yasukazu Tanabe

Yasukazu Tanabe 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).

  • Zoom lens apparatus
    Patent number: 4740064
    Abstract: A zoom lens apparatus comprises sensors for detecting relative positions of a variable power lens group and a compensating lens group, a memory for pre-storing compensating data peculiar to the zoom lens apparatus, a control circuit and driving parts for moving the variable power lens group and the compensating lens group. The control circuit compares position data set by a variable power setting operation and position data obtained from the sensors and outputs signals for controlling the relative positions of the variable power lens group and the compensating lens group based on the compensating data read out from the memory. The driving parts vary the relative positions of the variable power lens group and the compensating lens group responsive to the output signals of the control circuit.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: April 26, 1988
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Keizo Kono, Tameaki Ebihara, Syohei Kawai, Yasukazu Tanabe, Hiroshi Yoshinari