Patents Assigned to Nagaoka University of Technology
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Publication number: 20240060938Abstract: An ultrasonic inspection device includes: a longitudinal ultrasonic sensor configured to emit and receive a longitudinal ultrasonic wave; and an ultrasonic transducer unit made of metal and having the shape of a polyhedron. The ultrasonic transducer unit includes: an output surface configured to be disposed facing an object to be inspected; an input surface on which the longitudinal ultrasonic sensor is disposed; and a conversion surface configured to, when the longitudinal ultrasonic wave input through the input surface is reflected by the conversion surface, convert the longitudinal ultrasonic wave into a transverse ultrasonic wave such that the transverse ultrasonic wave propagates toward the output surface, the conversion surface being tilted at a predetermined angle with respect to an in-plane direction of the output surface. Thermal conductivity of the ultrasonic transducer unit is lower than thermal conductivity of the object to be inspected.Type: ApplicationFiled: August 2, 2023Publication date: February 22, 2024Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGYInventors: Tomohiro KOYAMA, Ikuo IHARA, Shinji WADA
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Patent number: 11899316Abstract: The present invention provides a polarization-independent terahertz wave control element, and provides a method for manufacturing a polarization-independent terahertz wave control element.Type: GrantFiled: December 25, 2020Date of Patent: February 13, 2024Assignees: NAGAOKA UNIVERSITY OF TECHNOLOGY, UNIVERSITY OF HYOGO, NISSAN CHEMICAL CORPORATIONInventors: Tomoyuki Sasaki, Hiroshi Ono, Nobuhiro Kawatsuki, Kohei Goto, Kimiaki Tsutsui
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Publication number: 20230402942Abstract: A power conversion device comprises: power conversion circuitry for converting DC power into AC power and supplying it into a load according to a switching state quantity defined by combinations among switching parameters of switching devices; a voltage output calculation device for calculating a voltage output value on the power conversion circuitry, based on the switching state quantity; an integration value calculation device for acquiring a voltage reference integration value and a voltage output integration value by integrating a voltage reference value and the calculated voltage output value; a switching update-determination unit for outputting an update signal of the switching state quantity, based on the voltage reference integration value, its allowance value, and the voltage output integration value; and a switching determination table for determining a switching state quantity of the switching devices, based on the voltage reference integration value, the voltage output integration value and the upType: ApplicationFiled: November 18, 2021Publication date: December 14, 2023Applicants: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of TechnologyInventors: Tenjiro HIWATARI, Sota SANO, Akira SATAKE, Kiyoshi OHISHI, Yuki YOKOKURA, Yuto KOBAYASHI
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Publication number: 20230340167Abstract: A polymerization catalyst composition contains a rare earth element carboxylate, a phosphate ester represented by the following general formula (1): (wherein Rs are each independently an alkyl group having 5 to 20 carbon atoms), and water.Type: ApplicationFiled: August 27, 2021Publication date: October 26, 2023Applicants: DIC Corporation, National University Corporation Nagaoka University of TechnologyInventors: Akinori Takahashi, Hiroaki Nakano, Katsuhiko Takenaka, Tomoyuki Toda
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Publication number: 20230093066Abstract: The present invention provides a polarization-independent terahertz wave control element, and provides a method for manufacturing a polarization-independent terahertz wave control element.Type: ApplicationFiled: December 25, 2020Publication date: March 23, 2023Applicants: NAGAOKA UNIVERSITY OF TECHNOLOGY, UNIVERSITY OF HYOGO, NISSAN CHEMICAL CORPORATIONInventors: Tomoyuki SASAKI, Hiroshi ONO, Nobuhiro KAWATSUKI, Kohei GOTO, Kimiaki TSUTSUI
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Patent number: 11560517Abstract: A photoreactive liquid crystal composition containing (A) a photoreactive polymer liquid crystal which includes a photoreactive side chain in which at least one type of reaction selected from (A-1) photocrosslinking and (A-2) photoisomerization occurs, and (B) a low molecular weight liquid crystal. An optical element or display element is formed having a liquid crystal cell including the photoreactive liquid crystal composition.Type: GrantFiled: July 7, 2020Date of Patent: January 24, 2023Assignees: UNIVERSITY OF HYOGO, NAGAOKA UNIVERSITY OF TECHNOLOGY, NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Tomoyuki Sasaki, Hiroshi Ono, Nobuhiro Kawatsuki, Kohei Goto
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Patent number: 11286449Abstract: The purpose of the present invention is to provide a cell culture substratum which has excellent resistance to liquid culture media and low cytotoxicity, can achieve a high cell adhesion ratio and a high viability of cultured cells, has excellent thermal stability, and is less likely to absorbs ultraviolet ray.Type: GrantFiled: May 18, 2017Date of Patent: March 29, 2022Assignees: OHARA, INC., NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY, NATIONAL INSTITUTE OF TECHNOLOGYInventors: Masahiko Inui, Sunao Chatani, Motohiro Tagaya, Satoshi Motozuka
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Publication number: 20210367394Abstract: A high-voltage pulse generation device configured to apply a pulsed high voltage to the space between a pair of discharge electrodes disposed in a laser chamber of a gas laser apparatus includes n transformer cores that form a transformer, where n is a natural number greater than or equal to two, n primary electric circuits of the transformer, the n primary electric circuits each having a first terminal connected to a reference potential and a second terminal connected to a charger, the n primary electric circuits each including one or more primary coils, one or more diodes connected in parallel to the one or more primary coils, and one or more pulse generators connected in parallel to the one or more primary coils, and a secondary electric circuit of the transformer, the secondary electric circuit including a secondary coil and connected to the pair of discharge electrodes.Type: ApplicationFiled: August 9, 2021Publication date: November 25, 2021Applicants: National University Corporation Nagaoka University of Technology, Gigaphoton Inc.Inventors: Weihua JIANG, Hiroshi UMEDA
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Publication number: 20210367393Abstract: A high voltage pulse generation device includes n transformer cores configuring a transformer, n being a natural number of 2 or more, each of the n transformer cores being configured to form a magnetic circuit along a first plane and to have a width in a first direction parallel to the first plane larger than a width in a second direction parallel to the first plane and perpendicular to the first direction; n primary electric circuits of the transformer connected in parallel to each other, each of the n primary electric circuits including at least one primary coil, and m pulse generation units connected in parallel to the at least one primary coil, m being a natural number equal to or more than 2; and a secondary electric circuit of the transformer including a secondary coil and connected to a pair of discharge electrodes.Type: ApplicationFiled: August 9, 2021Publication date: November 25, 2021Applicants: National University Corporation Nagaoka University of Technology, Gigaphoton Inc.Inventors: Weihua JIANG, Hiroshi UMEDA, Koji KAKIZAKI
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Patent number: 11177757Abstract: The present invention includes a control amount calculation unit which calculates two or more control amounts each indicating a driving condition of a rotary electric machine on the basis of output current from and a switching state in a power converter; a limitation range-provided command value generation unit which generates limitation range-provided command values relative to command values for the control amounts; and a switching state determination unit which determines a switching state such that each control amount falls within the limitation range of the corresponding limitation range-provided command value. For at least one of the limitation range-provided command values, the limitation range thereof is temporally changed on the basis of the driving condition of the rotary electric machine.Type: GrantFiled: December 7, 2017Date of Patent: November 16, 2021Assignees: MITSUBISHI ELECTRIC CORPORATION, NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGYInventors: Sota Sano, Akira Satake, Kiyoshi Ohishi, Yuki Yokokura, Tenjiro Hiwatari
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Publication number: 20210203261Abstract: The present invention includes a control amount calculation unit which calculates two or more control amounts each indicating a driving condition of a rotary electric machine on the basis of output current from and a switching state in a power converter; a limitation range-provided command value generation unit which generates limitation range-provided command values relative to command values for the control amounts; and a switching state determination unit which determines a switching state such that each control amount falls within the limitation range of the corresponding limitation range-provided command value. For at least one of the limitation range-provided command values, the limitation range thereof is temporally changed on the basis of the driving condition of the rotary electric machine.Type: ApplicationFiled: December 7, 2017Publication date: July 1, 2021Applicants: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of TechnologyInventors: Sota SANO, Akira SATAKE, Kiyoshi OHISHI, Yuki YOKOKURA, Tenjiro HIWATARI
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Patent number: 10992240Abstract: A power conversion device which reduces switching losses and stabilizes the output power. A switching-mode changer generates a reference signal for switching a mode of operation of the full-bridge circuit to a first switching mode or a second switching mode. In the first switching mode, an upper arm and a lower arm are switched synchronously, and a lower arm and an upper arm are non-conducting. In the second switching mode, the lower arm and the upper arm are switched synchronously, and the upper arm and the lower arm are non-conducting. The switching-mode changer adjusts the phase of the reference signal so that the reactive power is reduced.Type: GrantFiled: September 20, 2018Date of Patent: April 27, 2021Assignees: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of TechnologyInventors: Yu Kawai, Tatsuya Okuda, Jun-ichi Itoh, Hoai Nam Le
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Publication number: 20200332194Abstract: The purpose of the present invention is to provide: elements, in particular, a display element and an optical element, which are obtained by controlling orientation of liquid crystals in a liquid crystal bulk without using a liquid crystal orientation film; and/or a photoreactive liquid crystal composition for manufacturing the elements. The present invention provides: a photoreactive liquid crystal composition comprising (A) a photoreactive polymer liquid crystal which includes a photoreactive side chain in which at least one type of reaction selected from the group consisting of (A-1) photocrosslinking and (A-2) photoisomerization occurs, and (B) a low molecular weight liquid crystal; and an optical element or display element which is formed having a liquid crystal cell including the composition.Type: ApplicationFiled: July 7, 2020Publication date: October 22, 2020Applicants: UNIVERSITY OF HYOGO, NAGAOKA UNIVERSITY OF TECHNOLOGY, NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Tomoyuki SASAKI, Hiroshi ONO, Nobuhiro KAWATSUKI, Kohei GOTO
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Publication number: 20200295674Abstract: A power conversion device which reduces switching losses and stabilizes the output power. A switching-mode changer generates a reference signal for switching a mode of operation of the full-bridge circuit to a first switching mode or a second switching mode. In the first switching mode, an upper arm and a lower arm are switched synchronously, and a lower arm and an upper arm are non-conducting. In the second switching mode, the lower arm and the upper arm are switched synchronously, and the upper arm and the lower arm are non-conducting. The switching-mode changer adjusts the phase of the reference signal so that the reactive power is reduced.Type: ApplicationFiled: September 20, 2018Publication date: September 17, 2020Applicants: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of TechnologyInventors: Yu KAWAI, Tatsuya OKUDA, Jun-ichi ITOH, Hoai Nam LE
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Patent number: 10778116Abstract: A three-phase inverter includes three series circuits that are connected in parallel to a capacitor connected in parallel to a DC voltage source. Each of the three series circuits includes two semiconductor switching elements connected in series. A connection point between the two semiconductor switching elements is used as an AC output terminal for each phase. The three-phase inverter generates PWM pulses of three phases including a PWM pulse of one phase, whose pulse width of a positive side pulse in one switching cycle is the largest, and including PWM pulses of the other two phases such that a positional relationship between positive side pulses of the other two phases is a positional relationship in which an overlapping range on a time axis is smaller as compared with a state in which a positive side pulse of one phase encompasses a positive side pulse of the other pulse.Type: GrantFiled: February 19, 2019Date of Patent: September 15, 2020Assignees: National University Corporation Nagaoka University of Technology, FUJI ELECTRIC CO., LTD.Inventors: Junichi Itoh, Koroku Nishizawa, Akio Toba, Akihiro Odaka
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Patent number: 10710909Abstract: One of the purposes is to provide a pulse discharge power supply for use in generating pulse discharge. The pulse discharge power supply includes a pulse generation unit, a control circuit, an electric current detector and an electric current signal processing unit. The pulse generation unit generates a first pulse, and applies it to a discharge load for generating pulse discharge. The electric current detector detects an electric current flowing into the discharge load in accordance with the application of the pulse. The electric current signal processing unit outputs into the control circuit a signal based on an integration result of the electric current having been detected. The control circuit controls the generation of a second pulse in the pulse generation unit based on the signal being received.Type: GrantFiled: September 8, 2016Date of Patent: July 14, 2020Assignees: Mitsubishi Electric Corporation, Nagaoka University of TechnologyInventors: Yasutaka Inanaga, Teruki Naito, Gaku Oinuma, Weihua Jiang
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Patent number: 10461637Abstract: A switching element with a small current capacity is provided to be able to be used in a DC-DC converter. The DC-DC converter includes a switching circuit in which a first switching element, a second switching element, a third switching element, and a fourth switching element are connected in series, a flying capacitor that is connected between a connection portion between the first switching element and the second switching element and a connection portion between the third switching element and the fourth switching element, a reactor that is connected between a connection portion between the second switching element and the third switching element and a positive electrode of an input unit, and a control circuit that turns on/off the switching element, in which the control circuit turns on/off the switching elements so that a peak value in a reactor current becomes equal to or smaller than a predetermined value.Type: GrantFiled: September 17, 2018Date of Patent: October 29, 2019Assignees: OMRON Corporation, NAGAOKA University of TechnologyInventors: Junichi Itoh, Katsutaka Tanabe, Akihiro Funamoto, Koji Ando
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Patent number: 10436173Abstract: Provided are a rotary device for fluid power generation and a fluid power generation device that are capable of converting the kinetic energy of a fluid to an electric energy. By utilizing a longitudinal vortex as a driving force, a rotary body such as a cylinder as a high-strength and tough wing-shaped member can be rotated, and power can be efficiently generated in a wide range of flow rate without letting the longitudinal vortex disappear even if the flow rate changes in a wide range. This rotary device for power generation includes a rotary body 3; and a wake body 8 that is a distance away from the rotary body 3 toward the downstream side of a flow direction 10 of the fluid, and has at least one crossover section at which the wake body 8 intersects with the rotary body 3.Type: GrantFiled: December 25, 2015Date of Patent: October 8, 2019Assignee: NAGAOKA UNIVERSITY OF TECHNOLOGYInventors: Tsutomu Takahashi, Yumiko Yoshitake, Nao Komata, Yukiko Ueki
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Publication number: 20190252846Abstract: A high-voltage pulse generator may include a number “n” (n is a natural number of not less than 2) of primary electric circuits connected in parallel to one another on the primary side of a pulse transformer, and a secondary electric circuit of the pulse transformer, which is connected to a pair of discharge electrodes disposed in a laser chamber of a gas laser apparatus. The “n” primary electric circuits may include a number “n” of primary coils connected in parallel to one another, a number “n” of capacitors respectively connected in parallel to the “n” primary coils, and a number “n” of switches respectively connected in series to the “n” capacitors. The “n” primary electric circuits may be connected to a number “n” of chargers for charging the “n” capacitors, respectively.Type: ApplicationFiled: April 26, 2019Publication date: August 15, 2019Applicants: National University Corporation Nagaoka University of Technology, Gigaphoton Inc.Inventors: Weihua JIANG, Hiroshi UMEDA, Hakaru MIZOGUCHI, Takashi MATSUNAGA, Hiroaki TSUSHIMA, Tomoyuki OHKUBO
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Patent number: 10374229Abstract: A positive electrode active material for alkali-ion secondary batteries is provided which contains 20-55% of Na2O+Li2O, 10-60% of CrO+FeO+MnO+CoO+NiO, and 20-55% of P2O5+SiO2+B2O3 in terms of oxide-equivalent mol % and includes 50 mass % or more of an amorphous phase. According to the present invention, it is possible to provide a positive electrode active material for alkali-ion secondary batteries that enables high energy density and is excellent in the charge and discharge characteristics.Type: GrantFiled: February 17, 2016Date of Patent: August 6, 2019Assignees: NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY, NIPPON ELECTRIC GLASS CO., LTD.Inventors: Tsuyoshi Honma, Takayuki Komatsu, Satoshi Nakata, Hideo Yamauchi, Fumio Sato