Patents by Inventor Tadashi Itou

Tadashi Itou 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).

  • Circuit for displacement detector having sensor with a sensor coil forming differential transformer
    Patent number: 6781366
    Abstract: A circuit for a displacement detector having a contact sensor with a sensor coil forming a differential transformer is disclosed. The circuit includes a driver for generating a driving signal for driving the sensor coil, a standard signal processor for processing the driving signal and outputting a standard signal, an output signal processor for processing signals outputted from the differential transformer, a differential amplifier for carrying out differential amplification of the standard signal and the output signal from the output signal processing means, and an amplitude adjustor for adjusting the amplitude of the driving signal for the sensor coil to a constant value by feeding back the standard signal to the driver.
    Type: Grant
    Filed: October 8, 2003
    Date of Patent: August 24, 2004
    Assignee: OMRON Corporation
    Inventors: Naruaki Hiramatsu, Kimihiko Nakamura, Tadashi Itou, Satoshi Kuramoto
  • Circuit for displacement detector having sensor with a sensor coil forming differential transformer
    Publication number: 20040090227
    Abstract: A displacement detector has a contact sensor incorporating a differential transformer and a circuit for adjusting the amplitude of the driving signal for driving a differential transformer of the sensor by feeding back as a standard signal the driving signal through an amplifier and an AC-DC converter as a standard signal. The sensor has a housing containing a mobile member. The mobile member has a shaft with a hole. An outer tubular body of a linear bush and a ball guide each have a hole, and a pin is inserted through these holes movably in the direction of movement of the mobile member such that the rotation of the mobile member is prevented.
    Type: Application
    Filed: October 8, 2003
    Publication date: May 13, 2004
    Applicant: OMRON Corporation
    Inventors: Naruaki Hiramatsu, Kimihiko Nakamura, Tadashi Itou, Satoshi Kuramoto
  • High-precision sensor circuit for small-diameter cylindrical contact displacement detector
    Patent number: 6710592
    Abstract: A displacement detector has a contact sensor incorporating a differential transformer and a circuit for adjusting the amplitude of the driving signal for driving a differential transformer of the sensor by feeding back as a standard signal the driving signal through an amplifier and an AC-DC converter as a standard signal. The sensor has a housing containing a mobile member. The mobile member has a shaft with a hole. An outer tubular body of a linear bush and a ball guide each have a hole, and a pin is inserted through these holes movably in the direction of movement of the mobile member such that the rotation of the mobile member is prevented.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: March 23, 2004
    Assignee: Omron Corporation
    Inventors: Naruaki Hiramatsu, Kimihiko Nakamura, Tadashi Itou, Satoshi Kuramoto
  • Contact displacement detector and sensor
    Publication number: 20030006761
    Abstract: A displacement detector has a contact sensor incorporating a differential transformer and a circuit for adjusting the amplitude of the driving signal for driving a differential transformer of the sensor by feeding back as a standard signal the driving signal through an amplifier and an AC-DC converter as a standard signal. The sensor has a housing containing a mobile member. The mobile member has a shaft with a hole. An outer tubular body of a linear bush and a ball guide each have a hole, and a pin is inserted through these holes movably in the direction of movement of the mobile member such that the rotation of the mobile member is prevented.
    Type: Application
    Filed: May 31, 2002
    Publication date: January 9, 2003
    Inventors: Naruaki Hiramatsu, Kimihiko Nakamura, Tadashi Itou, Satoshi Kuramoto
  • Magnetic recording medium
    Patent number: 5993948
    Abstract: A magnetic recording medium comprises a nonmagnetic support having provided thereon a plurality of magnetic layers containing a first magnetic layer as a top layer and a second magnetic layer adjacent to the first magnetic layer. The first magnetic layer contains acicular magnetic powder and has a thickness of not more than 1.0 .mu.m; and the second magnetic layer contains sexangular plate-like magnetic powder.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: November 30, 1999
    Assignee: Kao Corporation
    Inventors: Toshio Yamazaki, Ken Yoshizawa, Tadashi Itou, Shigeaki Wakana, Satoshi Shimizu
  • Magnetic recording medium
    Patent number: 5776590
    Abstract: A magnetic recording medium comprises a nonmagnetic support having provided thereon a plurality of magnetic layers containing a first magnetic layer as a top layer and a second magnetic layer adjacent to the first magnetic layer. The first magnetic layer contains acicular magnetic powder and has a thickness of not more than 1.0 .mu.m; and the second magnetic layer contains sexangular plate-like magnetic powder.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: July 7, 1998
    Assignee: Kao Corporation
    Inventors: Toshio Yamazaki, Ken Yoshizawa, Tadashi Itou, Shigeaki Wakana, Satoshi Shimizu