Patents by Inventor Katsutoshi Hiratsu

Katsutoshi Hiratsu 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 encoder with a plurality of magnetic signal-generating means having different magnetic pole pitches
    Patent number: 5325056
    Abstract: A magnetic encoder containing a magnetic drum having on its side surface a plurality of magnetic signal-generating means having different magnetic pole pitches, and a plurality of magnetoresistance elements each disposed opposite to each of the magnetic signal-generating means. The magneto resistance elements include a plurality of series-connected thin, ferromagnetic layer patterns having a magnetoresistance effect so that an output signal of each magnetoresistance element is in the form of a substantially sinusoidal curve. The magnetic pole pitch of one magnetic signal-generating means is 5 times or more the magnetic pole pitch of other magnetic signal-generating means, and the magnetoresistance element opposite to the magnetic signal-generating means having a larger magnetic pole pitch includes by 5 or more series-connected thin, ferromagnetic layer patterns within the range of one-fourth the larger magnetic pole pitch.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: June 28, 1994
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yukimasa Shonowaki, Takehiko Sagara, Katsutoshi Hiratsu, Michiyuki Fukushima