Patents by Inventor Tomoya Matsumura

Tomoya Matsumura 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: 4887061
    Abstract: A pulse transformer for a flyback converter type switching power source has a ferrite core (10,11) with a pair of side legs (10a, 11a) and a center leg (10b, 11b) which is shorter than said side leg so that an air gap G is provided in the magnetic path along the center leg, and the windings on a bobbin (15) on said ferrite core is improved by positioning said gap G at the end portion of the center leg close to the end of the bobbin, and a dielectric belt (16b) on the bobbin (15) so that no winding exists around said gap. Thus, leakage flux around said gap does not interlink with the windings, and no eddy current flows in the windings, and a partial temperature raise in the windings is prevented.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: December 12, 1989
    Assignee: TDK Corporation
    Inventor: Tomoya Matsumura