Patents by Inventor Hiroshi Nishizawa

Hiroshi Nishizawa 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: 20210181360
    Abstract: Provided is a radioactive contamination inspection device, including: a detection unit having a sensitive surface that has a shape conforming to a shape of an object surface, which is a measurement target and a radioactive contamination amount of which is to be measured; a mechanism unit for holding the detection unit in a state in which a distance from the sensitive surface to the object surface falls within a desired range set in advance; and a measurement unit for calculating the radioactive contamination amount of the object surface on the basis of a measurement result from the detection unit.
    Type: Application
    Filed: June 27, 2016
    Publication date: June 17, 2021
    Applicant: MITSUBISHI ELECTRIC PLANT ENGINEERING CORPORATION
    Inventors: Hideaki KAKIUCHI, Hiroshi HAMAMOTO, Keiichi MATSUO, Masateru HAYASHI, Tetsushi AZUMA, Hiroshi NISHIZAWA, Makoto SASANO
  • Patent number: 10851433
    Abstract: A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%?C+N?0.4% and a PI value (=Cr+3.3Mo+16N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 ?m to 100 ?m and a surface hardness of 58 HRc to 62 HRc.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: December 1, 2020
    Assignee: NSK LTD.
    Inventors: Chikara Matsuzawa, Takafumi Yasuhara, Hiroshi Nishizawa, Norihiro Aoki, Koji Takano, Masaru Kuge
  • Patent number: 10661101
    Abstract: A dose distribution calculation device of the invention is characterized by including: a beam information storing unit (a measured energy storing unit, a measured electric-charge storing unit, a measured beam-central axis storing unit), in which, when particle beam information of a particle beam generated by a particle beam therapy system is measured by a measuring device in confirmative radiation in which the particle beam is radiated to a phantom as a substitute for a treatment target, the thus-measured particle beam information is stored; and a total dose calculation unit for calculating a radiation dose distribution (a total dose distribution) on the basis of the measured particle beam information (a measured energy, a measured beam quantity (a measured number of electric charges), a measured position of beam central axis).
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: May 26, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Yusuke Sakamoto, Hiroshi Nishizawa, Masateru Hayashi, Tetsushi Azuma, Kazuo Yamamoto, Yukiko Hirano, Natsuko Maeda, Eri Hattori, Taizo Honda, Yasuto Kishii
  • Patent number: 10494692
    Abstract: A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%?C+N?0.4% and a PI value (=Cr+3.3Mo+16N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 ?m to 100 ?m and a surface hardness of 58 HRc to 62 HRc.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: December 3, 2019
    Assignee: NSK LTD.
    Inventors: Chikara Matsuzawa, Takafumi Yasuhara, Hiroshi Nishizawa, Norihiro Aoki, Koji Takano, Masaru Kuge
  • Patent number: 10399817
    Abstract: In an elevator car position detection device, a magnetic field generator generates an eddy current magnetic field on an identification member, and a magnetic field detector detects the eddy current magnetic field generated on the identification member. The identification member includes a plurality of conductors which are continuously arranged along an ascending and descending direction of a car, and are relatively different in a plate thickness with respect to a skin depth of an eddy current generated by the magnetic field generator on the identification member. A shape of at least a part of a boundary between the adjacent conductors is a straight line or a curve tilted with respect to a direction orthogonal to the ascending and descending direction of the car.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: September 3, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Jin Inoue, Emiko Kurata, Yoshimasa Watanabe, Akihide Shiratsuki, Hiroshi Nishizawa, Hajime Nakajima, Masahiro Ishikawa
  • Publication number: 20190112686
    Abstract: A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%?C+N?0.4% and a PI value (=Cr+3.3 Mo+16 N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 ?m to 100 ?m and a surface hardness of 58 HRc to 62 HRc.
    Type: Application
    Filed: December 13, 2018
    Publication date: April 18, 2019
    Applicant: NSK LTD.
    Inventors: Chikara MATSUZAWA, Takafumi YASUHARA, Hiroshi NISHIZAWA, Norihiro AOKI, Koji TAKANO, Masaru KUGE
  • Publication number: 20180311513
    Abstract: A dose distribution calculation device of the invention is characterized by including: a beam information storing unit (a measured energy storing unit, a measured electric-charge storing unit, a measured beam-central axis storing unit), in which, when particle beam information of a particle beam generated by a particle beam therapy system is measured by a measuring device in confirmative radiation in which the particle beam is radiated to a phantom as a substitute for a treatment target, the thus-measured particle beam information is stored; and a total dose calculation unit for calculating a radiation dose distribution (a total dose distribution) on the basis of the measured particle beam information (a measured energy, a measured beam quantity (a measured number of electric charges), a measured position of beam central axis).
    Type: Application
    Filed: July 1, 2015
    Publication date: November 1, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yusuke SAKAMOTO, Hiroshi NISHIZAWA, Masateru HAYASHI, Tetsushi AZUMA, Kazuo YAMAMOTO, Yukiko HIRANO, Natsuko MAEDA, Eri HATTORI, Taizo HONDA, Yasuto KISHII
  • Publication number: 20180164444
    Abstract: Provided is a radioactive contamination inspection apparatus including a plastic scintillator, a light receiving element, a light guide configured to allow scintillation light emitted from the plastic scintillator to reach the light receiving element, a light shielding housing including an incidence window, and a thin film layer structure provided between the incidence window provided in the light shielding housing and the plastic scintillator, and including a protective film, a light shielding film, and a reflective film in the stated order from the incidence window side. A side surface of the light guide is made up of a diffused reflection surface. The reflective film is disposed with an air layer placed between the reflective film and the plastic scintillator. A surface of the reflective film, which faces the plastic scintillator, is made up of a specular reflection surface.
    Type: Application
    Filed: June 2, 2016
    Publication date: June 14, 2018
    Applicant: MITSUBISHI ELECTRIC PLANT ENGINEERING CORPORATION
    Inventors: Hideaki KAKIUCHI, Yohei SAKANASHI, Masateru HAYASHI, Tetsushi AZUMA, Hiroshi NISHIZAWA, Makito SEKI
  • Patent number: 9588236
    Abstract: A radioactivity analyzing apparatus for analyzing a radionuclide contained in a sample material. The apparatus includes a radiation detector that detects a radiation to be detected emitted from the sample material and a radiation analyzer configured to analyze the radiation based on an output from the radiation detector. The radiation analyzer includes a pulse-height analyzer configured to extract a pulse-height distribution from a pulse signal being output from the radiation detector and depending on the radiation, an inverse-problem operator configured to perform an inverse-problem solution of the pulse-height distribution to extract an energy spectrum of the radiation, and a deterioration detector configured to determine a deterioration state of the radiation detector based on the extracted energy spectrum.
    Type: Grant
    Filed: April 9, 2013
    Date of Patent: March 7, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tetsushi Azuma, Masateru Hayashi, Hiroshi Nishizawa, Hajime Nakajima, Kenji Inomata, Masakazu Nakanishi, Toshihide Aiba
  • Publication number: 20160289785
    Abstract: A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%?C+N?0.4% and a PI value (=Cr+3.3Mo+16N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 ?m to 100 ?m and a surface hardness of 58 HRc to 62 HRc.
    Type: Application
    Filed: November 13, 2014
    Publication date: October 6, 2016
    Applicant: NSK LTD.
    Inventors: Chikara MATSUZAWA, Takafumi YASUHARA, Hiroshi NISHIZAWA, Norihiro AOKI, Koji TAKANO, Masaru KUGE
  • Patent number: 9335380
    Abstract: The invention is related to a device for detecting insulation degradation in an inverter-driven load device, in particular a motor, the device including: zero-phase current measuring means for measuring a zero-phase current in power-feed lines, provided in the power-feed lines between an inverter device and the motor; and command control means for putting rotation of the motor on standby; wherein the zero-phase current measuring means measures the total of phase currents fed into respective phases so as not to rotate a shaft even when an external force is applied to the shaft during the rotation being on standby, whereby allowing regular detection of insulation degradation without switching over the power-feed lines connected with the load device.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: May 10, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshimasa Watanabe, Ryuichi Nishiura, Yoshiharu Kaneda, Hiroshi Nishizawa, Toru Oka, Hirotaka Muto, Toshiki Tanaka, Yoji Tsutsumishita
  • Patent number: 9234738
    Abstract: A detection track includes a first detection element group that includes a plurality of first magnetic resistance elements arranged at a pitch ?/(2n) when an order to cancel target harmonic components among a plurality of harmonic components superimposed on a fundamental component of a detection signal for multi-pole magnetic pattern is assumed as n, and a second detection element group that includes a plurality of second magnetic resistance elements arranged at the pitch ?/(2n), a plurality of first dummy magnetic resistance elements arranged among the first magnetic resistance elements, and a plurality of second dummy magnetic resistance elements arranged among the second magnetic resistance elements.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: January 12, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takumi Asano, Takeshi Musha, Hiroshi Nishizawa, Takashi Okamuro, Noriyasu Hasegawa
  • Patent number: 9222993
    Abstract: The invention is related to a magnetic substance detection device for detecting a magnetic substance, including: a magnetoresistive sensor arranged in the middle of a movement path of the magnetic substance; and a lower magnet in which a south pole and a north pole are arrayed along the movement direction of the magnetic substance; and a upper magnet in which a north pole and a south pole are arrayed along the movement direction of the magnetic substance. The lower and upper magnets are arranged with the movement path of the magnetic substance interposed so that the south pole of the lower magnet and the north pole of the upper magnet are opposed to each other, and the north pole of the lower magnet and the south pole of the upper magnet are opposed to each other, whereby the magnetic substance can be detected with high accuracy.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: December 29, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takeshi Musha, Jin Inoue, Hiroshi Nishizawa, Hajime Nakajima, Tomokazu Ogomi
  • Publication number: 20150344266
    Abstract: In an elevator car position detection device, a magnetic field generator generates an eddy current magnetic field on an identification member, and a magnetic field detector detects the eddy current magnetic field generated on the identification member. The identification member includes a plurality of conductors which are continuously arranged along an ascending and descending direction of a car, and are relatively different in a plate thickness with respect to a skin depth of an eddy current generated by the magnetic field generator on the identification member. A shape of at least a part of a boundary between the adjacent conductors is a straight line or a curve tilted with respect to a direction orthogonal to the ascending and descending direction of the car.
    Type: Application
    Filed: March 1, 2013
    Publication date: December 3, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Jin INOUE, Emiko KURATA, Yoshimasa WATANABE, Akihide SHIRATSUKI, Hiroshi NISHIZAWA, Hajime NAKAJIMA, Masahiro ISHIKAWA
  • Publication number: 20150212214
    Abstract: A radioactivity analyzing apparatus for analyzing a radionuclide contained in a sample material. The apparatus includes a radiation detector that detects a radiation to be detected emitted from the sample material and a radiation analyzer configured to analyze the radiation based on an output from the radiation detector. The radiation analyzer includes a pulse-height analyzer configured to extract a pulse-height distribution from a pulse signal being output from the radiation detector and depending on the radiation, an inverse-problem operator configured to perform an inverse-problem solution of the pulse-height distribution to extract an energy spectrum of the radiation, and a deterioration detector configured to determine a deterioration state of the radiation detector based on the extracted energy spectrum.
    Type: Application
    Filed: April 9, 2013
    Publication date: July 30, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tetsushi Azuma, Masateru Hayashi, Hiroshi Nishizawa, Hajime Nakajima, Kenji Inomata, Masakazu Nakanishi, Toshihide Aiba
  • Patent number: 9030210
    Abstract: The invention is related to an insulation deterioration diagnostic apparatus for an electric path connected between an inverter device and an inverter-driven load device, including: a zero-phase current transformer having an annular magnetic core, a magnetizing coil wound around the magnetic core, and a detecting coil wound around the magnetic core, the transformer being for detecting a zero-phase current of an electric path; a magnetization control circuit for supplying an alternating current having a frequency at least twice as high as a drive frequency of the load device to the magnetizing coil to magnetize the magnetic core; and a frequency extracting circuit for extracting a frequency component identical to the drive frequency fd, from the output signal of the detecting coil, whereby precisely measuring a current leaking from an inverter-driven load device over a wide range of frequencies.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: May 12, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshimasa Watanabe, Yoshiharu Kaneda, Hiroshi Nishizawa, Toru Oka
  • Publication number: 20150015245
    Abstract: A battery-less multi-rotation encoder including detection coils with the Barkhausen effect includes a rotation detection mechanism and a signal processing circuit. The detection coils generate voltage pulses with different positive and negative signs, and transmit them to the signal processing circuit, and the signal processing circuit includes a controller and an adder. The controller can set states of the detection coils to be High or Low and to maintain them at High or Low, based on the positive and negative signs of the respective voltage pulses and no voltage pulse being generated therefrom. The controller is configured to store the states of the respective detection coils in a memory. The adder can update a number of rotations according to the changes in the states of the respective detection coils. The signal processing circuit can determine the rotational angle of a rotational shaft within about 1/4 rotation unit.
    Type: Application
    Filed: January 8, 2013
    Publication date: January 15, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Jin Inoue, Takeshi Musha, Hiroshi Nishizawa, Hajime Nakajima, Ryosuke Takeuchi, Tatsuya Ito, Takashi Hirai, Hiroshi Nagata
  • Patent number: 8827560
    Abstract: A shaft, which supports an inner ring of a bearing and is integrally attached to a linear motion type slider, has a through hole in a center portion thereof. Since correction of the shaft may be performed by grasping a separate shaft to be inserted to the through hole, the shaft is not scratched. Additionally, even after press fitting the bearing, the posture may be corrected without grasping the bearing.
    Type: Grant
    Filed: May 30, 2011
    Date of Patent: September 9, 2014
    Assignee: NSK Ltd.
    Inventors: You Tsuchida, Hiroshi Nishizawa
  • Patent number: D748740
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: February 2, 2016
    Assignee: NSK LTD.
    Inventors: Haruo Sekido, Hiroshi Nishizawa
  • Patent number: D778991
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: February 14, 2017
    Assignee: NSK LTD.
    Inventors: Haruo Sekido, Hiroshi Nishizawa