Patents by Inventor Tachio Hasegawa

Tachio Hasegawa 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).

  • Magnetic head having optimum spacer thickness disposed between dummy and write-in core segments
    Patent number: 4085429
    Abstract: In a magnetic head comprising a write-in excitation core and a read-out excitation core having a narrower track width than that of the write-in excitation core and forming a closed magnetic circuit with a gap interposed between the two cores, a non-magnetic spacer having thickness 1.5 to 5 times as great as the width of the gap is disposed at one or each end of the read-out excitation core with respect to the widthwise direction of the track thereof, and a dummy core is disposed adjacent to the read-out excitation core with the non-magnetic spacer interposed therebetween to form a closed magnetic circuit with the gap interposed between the dummy core and the write-in excitation core.
    Type: Grant
    Filed: June 3, 1976
    Date of Patent: April 18, 1978
    Assignees: Canon Kabushiki Kaisha, Canon Denshi Kabushiki Kaisha
    Inventor: Tachio Hasegawa