Patents Assigned to Hioki Denki Kabushiki Kaisha
  • Publication number: 20190195919
    Abstract: A sensor detects a detected value for a covered wire without metallic contact, and includes: a tubular support that has a male thread and an insertion channel in which the covered wire is inserted and supported; a tubular shell that is inserted into the support from a base end; a pillar-shaped detection electrode that is inserted in and supported by the shell; and a tubular threaded piece that screws onto the male thread, is rotatably attached onto the shell, and is moved, along the axis of the support, together with the shell and the detection electrode by a screwing operation. The detection electrode is configured so that the front surface is pressed onto the covered wire in the support when the detection electrode moves, resulting in the front surface becoming capacitively coupled to a core wire of the covered wire via an insulating covering.
    Type: Application
    Filed: December 20, 2018
    Publication date: June 27, 2019
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Shin KASAI
  • Publication number: 20190146018
    Abstract: The present invention aims to reduce the leakage current that flows when measuring a high voltage and includes: a voltage detector that detects a voltage and outputs a detection voltage; a current supplier that supplies a measurement current across a pair of input terminals via a protective resistor; and a processor that executes a voltage measurement process, which measures the voltage based on data indicating the detection voltage, and a resistance measurement process, which measures a resistance connected between the input terminals based on the voltage and the current. A first switch is connected in parallel to the protective resistor and the processor executes the voltage measurement process in a state where the first switch has been set open to measure the terminal voltage, and executes the resistance measurement process by setting the first switch shorted when the voltage is equal to or below the reference voltage value.
    Type: Application
    Filed: January 11, 2019
    Publication date: May 16, 2019
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Tetsuya NAKAMURA, Takashi HIRAO, Yuta AKAMATSU, Yuta SUZUKI
  • Patent number: 10288649
    Abstract: A current sensor includes: a magnetic core that surrounds a detected object; a first sensor with a first sub-magnetic core incorporated in the magnetic core and a first winding wound around the first sub-magnetic core; a second sensor with a second sub-magnetic core incorporated in the magnetic core and a second winding wound around the second sub-magnetic core in the opposite direction to the first winding; a signal generator outputting signals to magnetize the first and second windings with inverted phases; a detector outputting a detection signal whose amplitude is proportionate to a current in the detected object based on the difference between first and second voltage signals generated in the first and second windings; and a waveform adjuster that is connected to at least one of the first and the second windings and adjusts the waveform of a voltage signal generated by the connected winding.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: May 14, 2019
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Kenichi Seki, Kazunobu Hayashi, Hajime Yoda
  • Patent number: 10267829
    Abstract: A voltage detecting probe includes: a shield barrel that is a barrel-shaped member made of an electrically conductive material and has an insertion concave for inserting a wire formed in a front end thereof by cutting away an outer circumferential wall at the front end along a direction perpendicular to an axis; and a detection electrode that is formed of a cylindrical member made of an electrically conductive material, whose front end surface and outer circumferential surface are covered with an insulating covering, and is housed inside the shield barrel and capable of moving relative to the shield barrel along the axis direction. When the detection electrode has been moved relative to the shield barrel and the front end surface is positioned at the insertion concave, the front end surface becomes capacitively coupled, via the insulating covering, with a wire inserted in the insertion concave.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: April 23, 2019
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Shin Kasai
  • Publication number: 20190098093
    Abstract: A remote operation system enables remote operation by an operation terminal of an electronic appliance, which executes a process according to control data from an external apparatus and outputs response data to the external apparatus, via the Internet. The remote operation system includes a first processor connected to the Internet and a second processor locally connected to the electronic appliance and set up for access by the first processor via the Internet. The second processor executes a first process that establishes a first path for reception of transmission data via the Internet from the first processor at any time. The first processor executes a second process that instructs the second processor via the first path to establish a second path for end-to-end communication to enable remote operation of the electronic appliance by the operation terminal via the Internet.
    Type: Application
    Filed: September 21, 2018
    Publication date: March 28, 2019
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Ippei FUNAHARA
  • Publication number: 20190004095
    Abstract: A current detector includes a ring-shaped core for inserting a wire; a detection winding on the core; and resistor connectors for connecting a resistor in series to the detection winding. The detection winding has a first winding at a first end and a second winding at a second end that are connected in series. The first winding and second winding each have n (where n is three or higher) first or second unit windings in series. The core surface is partitioned into 2n regions around the core. The first unit windings are formed in odd-numbered regions and the second unit windings are formed in even-numbered regions. A jth (where j is 1 to n) first unit winding from the first end and a jth second unit winding from the second end are not adjacent and are formed with an equal number of turns.
    Type: Application
    Filed: June 28, 2018
    Publication date: January 3, 2019
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Kazunobu HAYASHI, Kenichi SEKI, Hajime YODA
  • Patent number: 10168361
    Abstract: A signal is outputted via a transmission path with little attenuation while eliminating high-frequency noise. A current sensor includes: a coil wound around a magnetic core through whose interior a measured electrical path is inserted, is connected to ground at one end, and outputs a current with a current value in keeping with a current value of a measured current flowing on the measured electrical path; a constant impedance filter whose input terminal is connected to another end of the coil, limits a frequency range of the current inputted from the input terminal to a desired frequency range, and outputs the detection current from an output terminal; a transmission path that is directly connected at one end to the output terminal; and a terminating resistance that is connected between another end of the transmission path and ground and converts the current flowing via the transmission path to a detection voltage.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: January 1, 2019
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Masayuki Harano
  • Publication number: 20180374633
    Abstract: A winding bobbin includes a bobbin main body constructed in a ring shape so as to house a ring-shaped core and a plurality of partitions that are provided at intervals in a circumferential direction of the bobbin main body and formed so as to protrude from a surface of the bobbin main body. A winding is formed by winding a conductive wire in winding regions on the surface that are partitioned by the partitions. The partitions each include a flange that is formed of a U-shaped plate that protrudes from the surface at three positions out of four positions that are an outer circumference, an inner circumference, and two sides of the bobbin main body, with one position omitted, and a protrusion that is formed so as to protrude from at least one out of two opening-side ends of the flange.
    Type: Application
    Filed: June 19, 2018
    Publication date: December 27, 2018
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Tetsuya KOMIYAMA, Kazunobu HAYASHI
  • Patent number: 10041977
    Abstract: A voltage detecting probe includes a first shield with an insertion concave formed at a front end; a second shield that has a base end of the first shield inserted thereinto; and a detection electrode formed of a conductive cylindrical member, covered with an insulating covering, and housed inside the first shield. The first shield or detection electrode moves along an axis when an operation lever is moved. When the insulating covering on the front end contacts a measured wire inserted into the insertion concave, the detection electrode and wire become capacitively coupled. The operation lever includes a pillar portion inserted through a guide hole in the second shield and connected to the first shield or detection electrode. A third shield, which is attached to the pillar portion, moves with the operation lever, and shields the guide hole, is disposed inside and/or outside the second shield.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: August 7, 2018
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Shin Kasai
  • Patent number: 10012677
    Abstract: A voltage detecting apparatus detects a detection voltage generated in a detected object which is covered by an insulator. The voltage detecting apparatus includes: a detection electrode that is disposed so as to contact the insulator directly, or indirectly via another insulator; a vibrator that causes the insulator to vibrate; a current-to-voltage converter circuit that converts a detection current to a detection voltage signal, the detection current flowing from the detected object via the detection electrode to a reference voltage in a state where the insulator is being caused to vibrate, having an amplitude that is modulated in accordance with a potential difference between the detection voltage and the reference voltage, and being synchronized with vibration of the vibrator; and a detector circuit that detects a detection output indicating the potential difference from the detection voltage signal.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: July 3, 2018
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Koichi Yanagisawa
  • Patent number: 9964518
    Abstract: An electroplating solution analyzing apparatus measures a first current that flows between a counter electrode and a working electrode placed in electroplating solution while depositing metal on the working electrode by applying a set first voltage between a reference electrode and the working electrode and then measures a second current that flows between the counter electrode and the working electrode with a cycle set in advance while dissolving the metal deposited on the working electrode into the electroplating solution by applying a second voltage, which changes at a rate set in advance, between the reference electrode and the working electrode. During measurement, the first voltage is changed in a range set to produce a current density within a current density range set in advance. An analysis process then analyzes the state of the electroplating solution based on the values acquired by measurement.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: May 8, 2018
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Naoto Nakayama
  • Publication number: 20170343585
    Abstract: A signal is outputted via a transmission path with little attenuation while eliminating high-frequency noise. A current sensor includes: a coil wound around a magnetic core through whose interior a measured electrical path is inserted, is connected to ground at one end, and outputs a current with a current value in keeping with a current value of a measured current flowing on the measured electrical path; a constant impedance filter whose input terminal is connected to another end of the coil, limits a frequency range of the current inputted from the input terminal to a desired frequency range, and outputs the detection current from an output terminal; a transmission path that is directly connected at one end to the output terminal; and a terminating resistance that is connected between another end of the transmission path and ground and converts the current flowing via the transmission path to a detection voltage.
    Type: Application
    Filed: December 15, 2015
    Publication date: November 30, 2017
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Masayuki HARANO
  • Patent number: 9831828
    Abstract: A solar cell testing apparatus is provided that tests bypass diodes in a solar cell string constructed by connecting a plurality of solar cell modules, which include solar cells and the bypass diodes, in series for failures in the open position. The solar cell testing apparatus includes a unidirectional element that is connected between a positive electrode and a negative electrode of the solar cell string, and a voltage applier that applies a test voltage across the positive electrode and the negative electrode of the solar cell string to which the unidirectional element is connected. The solar cell testing apparatus also includes a current detector that detects a current flowing in the solar cell string, and a processor that executes processes that measure a current value of a shorted current of a solar cell string and tests for failures.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: November 28, 2017
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Masao Higuchi, Fumio Tokutake
  • Publication number: 20170338770
    Abstract: A solar cell testing apparatus is provided that tests bypass diodes in a solar cell string constructed by connecting a plurality of solar cell modules, which include solar cells and the bypass diodes, in series for failures in the open position. The solar cell testing apparatus includes a unidirectional element that is connected between a positive electrode and a negative electrode of the solar cell string, and a voltage applier that applies a test voltage across the positive electrode and the negative electrode of the solar cell string to which the unidirectional element is connected. The solar cell testing apparatus also includes a current detector that detects a current flowing in the solar cell string, and a processor that executes processes that measure a current value of a shorted current of a solar cell string and tests for failures.
    Type: Application
    Filed: August 7, 2017
    Publication date: November 23, 2017
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Masao HIGUCHI, Fumio TOKUTAKE
  • Publication number: 20170336443
    Abstract: There is provided a ring-shaped magnetic core that forms a closed magnetic circuit that encloses a measured electrical path, a magneto-electric converter that detects magnetic flux inside the magnetic core and outputs an electrical signal with an amplitude in keeping with a quantity of the magnetic flux, a coil that is formed on the magnetic core and is supplied with a negative feedback current generated based on the electrical signal, and an internal shield member disposed at least in a vicinity of the magneto-electric converter and the coil. A first gap that increases a magnetoresistance of a closed magnetic circuit, which is a closed magnetic circuit for leakage flux that leaks from the magnetic core and includes the internal shield member, a part of the magnetic core where the coil is formed, and the magneto-electric converter, is formed in the internal shield member.
    Type: Application
    Filed: December 15, 2015
    Publication date: November 23, 2017
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Osamu YOKOTA, Hidekazu MASUDA
  • Patent number: 9772352
    Abstract: A probe unit includes a probe pin and a support unit supporting the probe pin. The support unit includes first and second arms disposed at a distance along a direction in which the probe pin probes a probed object; a holding unit holding base ends of the arms; and a linking unit attached to the probe pin and linking front ends of the arms. The support unit constructs a four-bar linkage that permits linear or approximately linear movement of the probe pin in an opposite direction to the probing direction. The first and second arms have through-holes at positions slightly closer to the front ends than the base ends and positions slightly closer to the base ends than the front ends, center parts between the through-holes function as bars in the four-bar linkage, and formation positions of the through-holes function as joints in the four-bar linkage.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: September 26, 2017
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Masashi Kobayashi, Takahiro Ogawara
  • Patent number: 9762179
    Abstract: A solar cell testing apparatus tests bypass diodes in a solar cell string, which is constructed of solar cell modules including solar cells and the bypass diodes, for open-position failures and includes: a unidirectional element connected between positive and negative electrodes of the solar cell string so as to permit passage of the current outputted when the solar cells generate power; a voltage applier that apples a test voltage, which exceeds a sum of forward direction voltages of the bypass diodes and sets the negative electrode potential higher than the positive electrode potential, across the positive and negative electrodes; a current detector that detects a current flowing in the solar cell string; and a processor that tests for open-position failures by comparing currents detected before and after application of the test voltage with the unidirectional element connected between the electrodes of the solar cell string.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: September 12, 2017
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Masao Higuchi, Fumio Tokutake
  • Publication number: 20170115328
    Abstract: A current sensor includes: a magnetic core that surrounds a detected object; a first sensor with a first sub-magnetic core incorporated in the magnetic core and a first winding wound around the first sub-magnetic core; a second sensor with a second sub-magnetic core incorporated in the magnetic core and a second winding wound around the second sub-magnetic core in the opposite direction to the first winding; a signal generator outputting signals to magnetize the first and second windings with inverted phases; a detector outputting a detection signal whose amplitude is proportionate to a current in the detected object based on the difference between first and second voltage signals generated in the first and second windings; and a waveform adjuster that is connected to at least one of the first and the second windings and adjusts the waveform of a voltage signal generated by the connected winding.
    Type: Application
    Filed: October 13, 2016
    Publication date: April 27, 2017
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Kenichi SEKI, Kazunobu HAYASHI, Hajime YODA
  • Publication number: 20170067938
    Abstract: A voltage detecting probe includes a first shield with an insertion concave formed at a front end; a second shield that has a base end of the first shield inserted thereinto; and a detection electrode formed of a conductive cylindrical member, covered with an insulating covering, and housed inside the first shield. The first shield or detection electrode moves along an axis when an operation lever is moved. When the insulating covering on the front end contacts a measured wire inserted into the insertion concave, the detection electrode and wire become capacitively coupled. The operation lever includes a pillar portion inserted through a guide hole in the second shield and connected to the first shield or detection electrode. A third shield, which is attached to the pillar portion, moves with the operation lever, and shields the guide hole, is disposed inside and/or outside the second shield.
    Type: Application
    Filed: August 23, 2016
    Publication date: March 9, 2017
    Applicant: HIOKI DENKI KABUSHIKI KAISHA
    Inventor: Shin KASAI
  • Patent number: 9588072
    Abstract: A measurement apparatus includes a measuring unit that carries out a potential measuring process that measures potential at measured positions on a surface of a laminated body, in which a plurality of plate-like or film-like component parts with different physical properties have been laminated, in a state where an electrical signal has been supplied to the surface, and a processing unit that carries out a computational process, which has been decided in advance, using measurement values of the potential that have been measured by the potential measuring process to find an interfacial resistance of an interface between the component parts in the laminated body.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: March 7, 2017
    Assignee: HIOKI DENKI KABUSHIKI KAISHA
    Inventors: Yuki Kawamuro, Nobuhisa Handa, Tetsuya Takahashi