Patents by Inventor Tsunehiko Teshima

Tsunehiko Teshima 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).

  • Tracking control system for a video tape recorder
    Patent number: 4638379
    Abstract: In a system for controlling a tracking position of a rotary head for a VTR which has a rotary head including an audio and video heads, the existence of an audio signal reproduced by the audio head is detected and the tracking control is carried out on the basis of either the level of said audio FM signal when it exists or the level of a video FM signal reproduced by the video head when the audio FM signal does not exist.
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: January 20, 1987
    Assignee: Hitachi, Ltd.
    Inventor: Tsunehiko Teshima
  • Power supply for plural brushless DC motors
    Patent number: 4503369
    Abstract: A power supply in which a single variable voltage supply device is used as a power source for a plurality of motors which are simultaneously or successively rotated, in which each motor is subjected to constant current driving by a current control device connected to the motor, and in which the variable voltage supply device is controlled so as to produce a voltage which is the sum of the highest one of the voltages required for driving the motors and necessary and minimum voltage with which all the current control devices are operable.
    Type: Grant
    Filed: June 22, 1983
    Date of Patent: March 5, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Hideo Nishijima, Isao Fukushima, Tsunehiko Teshima, Yasunori Kobori, Takayasu Ito