Patents by Inventor Yoshinobu Umaji

Yoshinobu Umaji 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).

  • Method for forming magnetic gap of video signal erasure head, erasure head, and video recorder having the same
    Patent number: 7027709
    Abstract: The invention provides a simple method for forming a gap for an erasure head to improve the quality of this erasure head. A front core 3 constituting an erasure head H includes in configuration two magnetic substances 5 and a magnetic gap 6 made of a non-magnetic substance arranged between these two magnetic substances 5, in which the gap 6 made of the non-magnetic substance is bonded by adhesion or welding between those two magnetic substances 5. By this method, the gap can be formed free of an air bubble, with good mass-productivity, and inexpensively as compared to a prior art method of forming a gap by glass bonding.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: April 11, 2006
    Assignee: Funai Electric Co., Ltd.
    Inventors: Kiyoshi Matsui, Yoshinobu Umaji
  • Method for forming magnetic gap of video signal erasure head, erasure head, and video recorder having the same
    Publication number: 20020001156
    Abstract: The invention provides a simple method for forming a gap for an erasure head to improve the quality of this erasure head. A front core 3 constituting an erasure head H includes in configuration two magnetic substances 5 and a magnetic gap 6 made of a non-magnetic substance arranged between these two magnetic substances 5, in which the gap 6 made of the non-magnetic substance is bonded by adhesion or welding between those two magnetic substances 5. By this method, the gap can be formed free of an air bubble, with good mass-productivity, and inexpensively as compared to a prior art method of forming a gap by glass bonding.
    Type: Application
    Filed: May 1, 2001
    Publication date: January 3, 2002
    Inventors: Kiyoshi Matsui, Yoshinobu Umaji