Patents by Inventor Takeshige Iwakura

Takeshige Iwakura 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).

  • Dual magnetic head for reading and writing information at high and low track density including erase gaps having an undulating shape
    Patent number: 5181150
    Abstract: A dual magnetic head capable of reducing unneccessary magnetic flux developed in erase cores. The dual magnetic head includes a first read/write core (30) having a first gap width (34) and extending in a track direction in which the tracks will be formed on a magnetic recording medium, a second read/write core (10) having a second read/write gap (14) with a width greater than the first gap width, and juxtaposed to the first read/write core (30) in a perpendicular direction to the track direction; and an erase core (20) having a pair of erase gaps (24, 25) located at opposite ends of the second read/write gap (14) with respect to the perpendicular direction, the erase core (20) being juxtaposed to the first read/write core (30) in the perpendicular direction and juxtaposed to the second read/write core (10) in the track direction, at least one of the facing surfaces of the erase core (20) which define the erase gaps (24, 25) therebetween being provided with an undulation.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: January 19, 1993
    Assignee: NEC Corp.
    Inventors: Yuichi Hayakawa, Takeshige Iwakura, Hiroshi Tsutsui, Atsushi Hirano, Makoto Miyazaki