Patents by Inventor Tomohiro Moriyama
Tomohiro Moriyama 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).
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Patent number: 10755442Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: GrantFiled: January 12, 2018Date of Patent: August 25, 2020Assignee: Hitachi, Ltd.Inventors: Li Lu, Satoshi Ichimura, Tomohiro Moriyama, Jun Nukaga, Toshiaki Rokunohe, Akira Yamagishi, Yasutomo Saito
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Patent number: 10234355Abstract: A leakage oil detection system includes a measurement device including a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays, and an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and an analysis device that includes a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process to detect leakage oil.Type: GrantFiled: July 8, 2016Date of Patent: March 19, 2019Assignee: Hitachi, Ltd.Inventors: Li Lu, Satoshi Ichimura, Tomohiro Moriyama, Jun Nukaga, Akira Yamagishi, Yasutomo Saito
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Patent number: 10155916Abstract: Provided is a lubricant for a gas insulated switchgear, with which properties of a base oil such as heat resistance, evaporation loss, fluidity under a low temperature, and chemical stability (oxidation resistance and HF resistance) are balanced at a level higher than the conventional level, and long service life and high reliability of the gas insulated switchgear are achieved. A lubricant for a gas insulated switchgear according to the present invention, contains: a base oil containing a polyalphaolefin having a kinematic viscosity at 40° C. of 50 mm2/s or more; and a thickener containing bisamides.Type: GrantFiled: February 4, 2016Date of Patent: December 18, 2018Assignee: HITACHI, LTD.Inventors: Takayuki Nakakawaji, Hiroyuki Akata, Tomohiro Moriyama, Kazuhiro Satou, Makoto Hirose
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Patent number: 10113933Abstract: A system and method for detecting leakage oil with a high degree of accuracy while avoiding the complexity of the system and the influence of noise light comprise: ultraviolet light sources arranged to irradiate an oil-filled device from a plurality of different incidence angles, and are switched on and off at the respective incidence angles in sequence, and include a wavelength exciting oil; an imaging device to photograph the oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light sources when the ultraviolet light sources are switched on; a recorder to record respective images photographed by the imaging device; and a display to display the respective images. The respective images are compared, a site where a light emitting position does not change always is judged as a leakage oil site, and a site emitting light or not emitting light occasionally is judged as a noise light site.Type: GrantFiled: March 27, 2015Date of Patent: October 30, 2018Assignee: Hitachi, Ltd.Inventors: Li Lu, Toshiaki Rokunohe, Tomohiro Moriyama, Jun Nukaga, Akira Yamagishi, Yasutomo Saito
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Publication number: 20180137652Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: ApplicationFiled: January 12, 2018Publication date: May 17, 2018Inventors: Li LU, Satoshi ICHIMURA, Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Akira YAMAGISHI, Yasutomo SAITO
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Patent number: 9898830Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: GrantFiled: February 25, 2016Date of Patent: February 20, 2018Assignee: Hitachi, Ltd.Inventors: Li Lu, Satoshi Ichimura, Tomohiro Moriyama, Jun Nukaga, Toshiaki Rokunohe, Akira Yamagishi, Yasutomo Saito
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Publication number: 20170349854Abstract: Provided is a lubricant for a gas insulated switchgear, with which properties of a base oil such as heat resistance, evaporation loss, fluidity under a low temperature, and chemical stability (oxidation resistance and HF resistance) are balanced at a level higher than the conventional level, and long service life and high reliability of the gas insulated switchgear are achieved. A lubricant for a gas insulated switchgear according to the present invention, contains: a base oil containing a polyalphaolefin having a kinematic viscosity at 40° C. of 50 mm2/s or more; and a thickener containing bisamides.Type: ApplicationFiled: February 4, 2016Publication date: December 7, 2017Applicant: HITACHI, LTD.Inventors: Takayuki NAKAKAWAJI, Hiroyuki AKATA, Tomohiro MORIYAMA, Kazuhiro SATOU, Makoto HIROSE
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Publication number: 20170234762Abstract: A system and method for detecting leakage oil with a high degree of accuracy while avoiding the complexity of the system and the influence of noise light comprise: ultraviolet light sources arranged to irradiate an oil-filled device from a plurality of different incidence angles, and are switched on and off at the respective incidence angles in sequence, and include a wavelength exciting oil; an imaging device to photograph the oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light sources when the ultraviolet light sources are switched on; a recorder to record respective images photographed by the imaging device; and a display to display the respective images. The respective images are compared, a site where a light emitting position does not change always is judged as a leakage oil site, and a site emitting light or not emitting light occasionally is judged as a noise light site.Type: ApplicationFiled: March 27, 2015Publication date: August 17, 2017Applicant: HITACHI, LTD.Inventors: Li LU, Toshiaki ROKUNOHE, Tomohiro MORIYAMA, Jun NUKAGA, Akira YAMAGISHI, Yasutomo SAITO
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Patent number: 9613762Abstract: Disclosed is a power switch gear that includes: a fixed electrode and a movable electrode disposed opposite to each other in a tank filled with insulting gas; and a movable conductor electrically connecting the fixed electrode and the movable electrode together. The fixed electrode and the movable electrode have a contactor through which current flows to the movable conductor. At least one of the fixed electrode and the movable electrode has ring-shaped sliding members, the ring-shaped sliding members being disposed, on both sides of the contactor. At least one grease pool is provided between the contactor and the sliding members.Type: GrantFiled: July 30, 2015Date of Patent: April 4, 2017Assignee: Hitachi, Ltd.Inventors: Jun Nukaga, Yoshio Hamadate, Tomohiro Moriyama, Yoshiaki Seya
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Publication number: 20170016796Abstract: There is provided a leakage oil detection system including: a measurement device that includes a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays, and an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and an analysis device that includes a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process.Type: ApplicationFiled: July 8, 2016Publication date: January 19, 2017Inventors: Li LU, Satoshi ICHIMURA, Tomohiro MORIYAMA, Jun NUKAGA, Akira YAMAGISHI, Yasutomo SAITO
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Publication number: 20160275699Abstract: An oil leakage detector of the present invention includes an image processing unit wherein the image processing unit calculates the values of saturation and intensity of each pixel in the color image of the object after an ultra-violet light is irradiated thereon, draws an intensity-saturation characteristic line of the saturation expressed in an X-axis and the intensity expressed in a Y-axis, sets an upper limit and a lower limit of intensity of each saturation as a threshold value based on an area without oil adhesion on the surface of the object, and determines, in the intensity-saturation characteristic line, an area corresponding to a pixel group where the intensity exceeds the threshold value of the upper limit and a pixel group where the intensity falls below the threshold value of the lower limit, to be an oil leakage adhered area.Type: ApplicationFiled: February 25, 2016Publication date: September 22, 2016Inventors: Li LU, Satoshi ICHIMURA, Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Akira YAMAGISHI, Yasutomo SAITO
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Publication number: 20160049268Abstract: Magnetic force of a permanent magnet can be converted into arc driving force efficiently, and the permanent magnet can be insulated from arc heat so as to suppress magnetic deterioration, whereby breaking performance can be secured over a long period of time.Type: ApplicationFiled: March 7, 2014Publication date: February 18, 2016Applicant: Hitachi, Ltd.Inventors: Toshiaki ROKUNOHE, Tatsuro KATO, Jun NUKAGA, Tomohiro MORIYAMA, Kenji TSUCHIYA
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Publication number: 20160035501Abstract: Disclosed is a power switch gear that includes: a fixed electrode and a movable electrode disposed opposite to each other in a tank filled with insulting gas; and a movable conductor electrically connecting the fixed electrode and the movable electrode together. The fixed electrode and the movable electrode have a contactor through which current flows to the movable conductor. At least one of the fixed electrode and the movable electrode has ring-shaped sliding members, the ring-shaped sliding members being disposed, on both sides of the contactor. At least one grease pool is provided between the contactor and the sliding members.Type: ApplicationFiled: July 30, 2015Publication date: February 4, 2016Inventors: Jun NUKAGA, Yoshio HAMADATE, Tomohiro MORIYAMA, Yoshiaki SEYA
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Publication number: 20140360984Abstract: Compact lightweight gas insulated switchgear which assures sufficient electrode fixing strength equivalent to the fixing strength given by brazing and is structurally simple and enables efficient arc rotation with low operating energy. In the switchgear, a movable arcing contact is located on a movable element, opposite to a fixed arcing contact and electrically connected to, or disconnected from, the fixed arcing contact as the movable element moves. The movable arcing contact includes, in order from its tip opposite to the fixed arcing contact, a first electrode as a convex hollow coaxial cylindrical electrode, hollow coaxial cylindrical first spacer, and second electrode as a hollow coaxial cylindrical electrode and has electric conduction means to connect the first and second electrodes electrically through the first spacer. The first and second electrodes are fixed through the first spacer by a fixing member having higher resistivity than the first and second electrodes.Type: ApplicationFiled: June 4, 2014Publication date: December 11, 2014Applicant: HITACHI, LTD.Inventors: Tomohiro MORIYAMA, Jun NUKAGA, Toshiaki ROKUNOHE, Masashi KAWAMATA
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Patent number: 7631458Abstract: A guide rail assembly includes a guide rail, a slider that slides along the guide rail, a wire fixed to the slider, and upper and lower wire feeders located at the upper and lower ends of the guide rail. The guide rail assembly, a drum around which the wire is wound, and a motor for turning the drum are mounted on a base bracket to form a single unit which is attached to a door inner panel.Type: GrantFiled: June 6, 2006Date of Patent: December 15, 2009Assignees: Johnan Manufacturing Co., Ltd., Honda Motor Co., Ltd.Inventors: Tomohiro Moriyama, Hakurei Watanabe, Takashi Ogawa
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Patent number: 7388384Abstract: A gas-insulated apparatus is equipped with multiple sensors for sensing a partial discharge signal caused by a foreign substance, and a frequency analyzing section for analyzing the frequency of the sensed partial discharge signal. A defect type judging section estimates the defect type of the foreign substance from the signal obtained through the frequency analysis or from the voltage phase distribution of partial discharge synchronized with the frequency of the voltage applied to the gas-insulated apparatus, and a location determining section estimates the defect location and signal intensity from the multiple partial discharge signals. A defect size calculating section estimates the defect size for each defect type from the signal intensity and field distribution at the defect location. Dielectric breakdown risk evaluation is performed based on the defect size and type, and the insulation failure risk is diagnosed from the partial discharge.Type: GrantFiled: December 16, 2005Date of Patent: June 17, 2008Assignee: Japan AE Power Systems CorporationInventors: Tatsuro Kato, Tomohiro Moriyama, Fumihiro Endo
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Publication number: 20070290602Abstract: The present invention provides a planar image display device which can prevent the generation of discharge by attenuating the concentration of an electric field on an end surface of a high voltage applied portion of a phosphor screen. In a planar image display device which includes a back substrate having a plurality of signal lines and a plurality of electron sources on a glass substrate, a face substrate having a phosphor screen layer, a BM film and a metal back on a glass substrate, and a frame body interposed between the back substrate and the face substrate, a high resistance film is arranged to cover a periphery of the metal back.Type: ApplicationFiled: May 31, 2007Publication date: December 20, 2007Inventors: Nobuhiko Hosotani, Shigemi Hirasawa, Yuuichi Kijima, Tomohiro Moriyama, Takashi Naito
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Patent number: 7256584Abstract: In the measurement of partial discharge, a voltage detected by an antenna is input to a spectrum analyzer and a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer. Based on the phase difference and the voltage phase shift associated with the input impedance of a signal converter circuit, the time axis displayed on the screen of the spectrum analyzer is compensated. After the compensation has been carried out, the voltage detected by the antenna is input into the spectrum analyzer and the partial discharge pattern which synchronizes with the operating voltage is measured by phase domain analysis using the spectrum analyzer.Type: GrantFiled: December 6, 2005Date of Patent: August 14, 2007Assignee: Japan AE Power Systems CorporationInventors: Tomohiro Moriyama, Tatsuro Kato, Toshiaki Rokunohe, Fumihiro Endo, Ryoichi Shinohara
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Publication number: 20070044382Abstract: A guide rail assembly includes a guide rail, a slider that slides along the guide rail, a wire fixed to the slider, and upper and lower wire feed means located at the upper and lower ends of the guide rail. The guide rail assembly, a drum around which the wire is wound, and a motor for turning the drum are mounted on a base bracket to form a single unit which is attached to a door inner panel.Type: ApplicationFiled: June 6, 2006Publication date: March 1, 2007Applicants: JOHNAN MANUFACTURING CO., LTD., HONDA MOTOR CO., LTD.Inventors: Tomohiro Moriyama, Hakurei Watanabe, Takashi Ogawa
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Publication number: 20060164100Abstract: In the measurement of partial discharge, a voltage detected by the antenna is input into a spectrum analyzer and a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer. Based on the phase difference and the voltage phase shift associated with input impedance of the signal converter circuit, the time axis displayed on the screen of the spectrum analyzer is compensated. After the compensation has been carried out, the voltage detected by the antenna is input into the spectrum analyzer, the partial discharge pattern which synchronizes with the operating voltage is measured by phase domain analysis using the spectrum analyzer.Type: ApplicationFiled: March 23, 2006Publication date: July 27, 2006Inventors: Tomohiro Moriyama, Tatsuro Kato, Toshiaki Rokunohe, Fumihiro Endo, Ryoichi Shinohara