Patents by Inventor Yasutaka Koumatsu

Yasutaka Koumatsu 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).

  • Patent number: 4470078
    Abstract: A control circuit causes a reproducing transducer feeding motor to move the transducer radially across a disc having a video signal recorded thereon. The video signal is recorded along a spiral track, together with first, second, and third reference signals which control the transducer tracking. A feed pulse forming circuit forms a number of feed pulses according to the number of switching pulses which are generated due to the reproduction of the third reference signal. A number of kick pulses are required for shifting the reproducing transducer element from one track turn to another track turn as it moves toward a center of the rotary recording medium, with the movement occurring at a position where the third reference signal is recorded. The control circuit causes a rotation of the motor for moving the reproducing transducer along the radial direction of the disc, according to the number of feed pulses that are obtained from the feed pulse forming circuit.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: September 4, 1984
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Atsumi Hirata, Katsuyuki Mitsui, Yasutaka Koumatsu