Patents by Inventor Junichi Yotsuji

Junichi Yotsuji 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).

  • Publication number: 20220254010
    Abstract: An inspection apparatus for coke oven construction that is configured to check accuracy after refractories are laid in oven construction work for updating or newly creating a coke oven that produces coke. The inspection apparatus includes an image capturing device configured to acquire an image of a work area where oven construction work is in progress, measurement region determining means configured to identify a work-completed area where laying work has been completed on the basis of the image of the work area acquired by the image capturing device, and determine the identified work-completed area as a measurement region, and a refractory position measuring device configured to check laying accuracy by measuring positions of laid refractories in the measurement region determined by the measurement region determining means.
    Type: Application
    Filed: March 24, 2020
    Publication date: August 11, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Yuki TAKAKI, Junichi YOTSUJI, Taku WATANABE
  • Publication number: 20200385240
    Abstract: An object is to provide a lifting-magnet attachment magnetic pole unit, a lifting magnet, a steel material conveying method, and a steel plate manufacturing method with which only one or a desired pieces of steel materials can be held. The present invention is a lifting-magnet attachment magnetic pole unit for a lifting magnet used to lift and convey a steel material with magnetic force. The lifting-magnet attachment magnetic pole unit includes a first split magnetic pole that is in contact with an iron core of the lifting magnet and has a branched structure, and a second split magnetic pole that is in contact with a yoke of the lifting magnet and has a branched structure. The first and second split magnetic poles are alternately arranged.
    Type: Application
    Filed: November 29, 2018
    Publication date: December 10, 2020
    Applicant: JFE Steel Corporation
    Inventors: Yuki Takaki, Masaki Kobayashi, Junichi Yotsuji
  • Patent number: 10031068
    Abstract: A steel sheet inspection device includes: a magnetooptic element that is able to detect, as an optical property, a magnetic domain structure of a steel sheet to be inspected; a light source that irradiates the magnetooptic element with linearly polarized light; a detector that detects the linearly polarized light with a polarization plane rotated according to the magnetic domain structure of the steel sheet transferred to the magnetooptic element; and a drive mechanism that drives at least the magnetooptic element so as to contact and separate the steel sheet and the magnetooptic element with and from each other.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: July 24, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Tomohiko Ito, Junichi Yotsuji, Shigehiro Takajo, Hiroi Yamaguchi, Kazuhiro Hanazawa, Yasunari Koga
  • Patent number: 9304078
    Abstract: An electron gun abnormality detecting device for detecting an abnormality in first and second electron guns of a magnetic domain refining device for an electrical steel sheet includes: a magnetooptic element configured to contact with and separate from an inspection region set to include a boundary between a magnetic domain discontinuity generated by irradiation of a surface of the electrical steel sheet with an electron beam by the first electron gun and a magnetic domain discontinuity generated by irradiation thereof with an electron beam by the second electron gun, and configured to detect a steel sheet magnetic domain structure in the inspection region as an optical property; a light source configured to irradiate the magnetooptic element with linearly polarized light; and a detector configured to detect polarized light rotated by the steel sheet magnetic domain structure transferred to the magnetooptic element.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: April 5, 2016
    Assignee: JFE STEEL CORPORATION
    Inventors: Tomohiko Ito, Junichi Yotsuji, Shigehiro Takajo, Hiroi Yamaguchi, Kazuhiro Hanazawa, Yasunari Koga
  • Publication number: 20160054266
    Abstract: An ultrasonic flaw detection method includes a condition setting step of setting a boundary echo detection threshold and a gate end point relative position, according to a type of a test object, a flaw detection signal obtaining step of obtaining a flaw detection signal by converting ultrasonic waves received from the test object to an electric signal, a boundary echo detection step of detecting a boundary echo detection time of the flaw detection signal by using the boundary echo detection threshold, a flaw echo detection gate setting step of setting an end point of a flaw echo detection gate by subtracting the gate end point relative position from the boundary echo detection time, and a flaw echo detection step of detecting a flaw echo by using the flaw detection signal within the flaw echo detection gate.
    Type: Application
    Filed: March 28, 2014
    Publication date: February 25, 2016
    Inventors: Takafumi Ozeki, Junichi Yotsuji, Hideki Takada, Yasuo Tomura
  • Publication number: 20150253242
    Abstract: A steel sheet inspection device includes: a magnetooptic element that is able to detect, as an optical property, a magnetic domain structure of a steel sheet to be inspected; a light source that irradiates the magnetooptic element with linearly polarized light; a detector that detects the linearly polarized light with a polarization plane rotated according to the magnetic domain structure of the steel sheet transferred to the magnetooptic element; and a drive mechanism that drives at least the magnetooptic element so as to contact and separate the steel sheet and the magnetooptic element with and from each other.
    Type: Application
    Filed: September 25, 2013
    Publication date: September 10, 2015
    Inventors: Tomohiko Ito, Junichi Yotsuji, Shigehiro Takajo, Hiroi Yamaguchi, Kazuhiro Hanazawa, Yasunari Koga
  • Publication number: 20150241335
    Abstract: An electron gun abnormality detecting device for detecting an abnormality in first and second electron guns of a magnetic domain refining device for an electrical steel sheet includes: a magnetooptic element configured to contact with and separate from an inspection region set to include a boundary between a magnetic domain discontinuity generated by irradiation of a surface of the electrical steel sheet with an electron beam by the first electron gun and a magnetic domain discontinuity generated by irradiation thereof with an electron beam by the second electron gun, and configured to detect a steel sheet magnetic domain structure in the inspection region as an optical property; a light source configured to irradiate the magnetooptic element with linearly polarized light; and a detector configured to detect polarized light rotated by the steel sheet magnetic domain structure transferred to the magnetooptic element.
    Type: Application
    Filed: September 25, 2013
    Publication date: August 27, 2015
    Inventors: Tomohiko Ito, Junichi Yotsuji, Shigehiro Takajo, Hiroi Yamaguchi, Kazuhiro Hanazawa, Yasunari Koga
  • Patent number: 6479992
    Abstract: The present invention provides a leakage flux flaw detecting method in which a ferromagnetic substance such as a steel sheet or coil is magnetized by a plurality of magnetic fields with different intensity and magnetic flux leaking from the ferromagnetic substance having been magnetized is detected by a magnetic sensor, and output signals of the magnetic sensor after the detection of leakage flux are processed so that a signal caused by a flaw in the ferromagnetic substance is highlighted. Since this leakage flux flaw detecting method makes it possible to detect flaws with high accuracy, a scaled or descaled hot rolled steel sheet or coil in which the accurate flaw information such as location, density, size, and the like is known can be provided by applying this method to the manufacturing of hot rolled steel sheet or coil.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: November 12, 2002
    Assignee: NKK Corporation
    Inventors: Hiriharu Kato, Junichi Yotsuji, Akio Nagamune
  • Publication number: 20020121896
    Abstract: The present invention provides a leakage flux flaw detecting method in which a ferromagnetic substance such as a steel sheet or coil is magnetized by a plurality of magnetic fields with different intensity and magnetic flux leaking from the ferromagnetic substance having been magnetized is detected by a magnetic sensor, and output signals of the magnetic sensor after the detection of leakage flux are processed so that a signal caused by a flaw in the ferromagnetic substance is highlighted. Since this leakage flux flaw detecting method makes it possible to detect flaws with high accuracy, a scaled or descaled hot rolled steel sheet or coil in which the accurate flaw information such as location, density, size, and the like is known can be provided by applying this method to the manufacturing of hot rolled steel sheet or coil.
    Type: Application
    Filed: January 7, 2002
    Publication date: September 5, 2002
    Applicant: NKK Corporation
    Inventors: Hiriharu Kato, Junichi Yotsuji, Akio Nagamune
  • Patent number: 6057684
    Abstract: A magnetic sensor in which magnetic leakage flaw detection can be performed with high accuracy without so reducing liftoff, and a magnetic flaw detection method and apparatus to which the magnetic sensor is applied. The magnetic sensor 50 for detecting magnetic flux generated due to a defect portion of a magnetized subject to be inspected has an E-shaped core 51 having magnetic poles (51a, 51b and 51c) arranged in the neighborhood of a steel plate (13) to be inspected, and a search coil (52) wound on the center magnetic pole (51b) of the E-shaped core for detecting the magnetic flux. An external magnetic field floating in the circumference of the E-shaped magnetic sensor passes through the opposite side magnetic poles (51a and 51c) of the E-shaped core 51 but does not cross the center magnetic pole (51b) of the E-shaped core. Accordingly, no voltage due to the external magnetic field is induced in the search coil (52), so that only the magnetic flux caused by the defect portion is detected.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: May 2, 2000
    Assignees: Yoshihiro Murakami, NKK Corporation
    Inventors: Yoshihiro Murakami, Akio Nagamune, Hiroharu Kato, Junichi Yotsuji, Kozo Maeda, Kenichi Iwanaga