Patents by Inventor Yujiro TOMITA
Yujiro TOMITA 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: 11035888Abstract: A current sensor includes a bus bar in which a current to be detected flows, a circuit board mounted with a magnetic detection element thereon to detect a strength of a magnetic field generated by a current flowing in the bus bar, and a housing including first and second housings provided in such a manner as to sandwich the bus bar and the circuit board therebetween in a plate thickness direction of the bus bar. The first and second housings include slide guide portions respectively which are relatively slidable in a sloping direction with respect to the plate thickness direction of the bus bar while abutting each other in the plate thickness direction of the bus bar.Type: GrantFiled: December 4, 2018Date of Patent: June 15, 2021Assignee: HITACHI METALS, LTD.Inventors: Jun Umetsu, Naoki Futakuchi, Haruyasu Komano, Ken Okuyama, Yujiro Tomita
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Patent number: 10877075Abstract: A current sensor includes first and second bus bars aligned and arranged in such a manner to be spaced from each other in a plate width direction, a third bus bar arranged in such a manner that a plate thickness direction thereof coincides with a plate thickness direction of the first and second bus bars and a length direction thereof is orthogonal to a length direction of the first and second bus bars, first and second magnetic detection elements arranged opposite the first and second bus bars respectively in the plate thickness direction, and a third magnetic detection element arranged opposite the third bus bar in the plate thickness direction. The first and second magnetic detection elements are gradient detection type magnetic detection elements and are arranged in such a manner that a detection axis direction thereof is perpendicular to the length direction of the first and second bus bars and is tilted with respect to the plate thickness direction of the first and second bus bars.Type: GrantFiled: October 11, 2018Date of Patent: December 29, 2020Assignee: Hitachi Metals, Ltd.Inventors: Ken Okuyama, Naoki Futakuchi, Haruyasu Komano, Jun Umetsu, Yujiro Tomita
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Patent number: 10877071Abstract: A current sensor includes three bus bars arranged in such a manner to be spaced and aligned in a width direction thereof. A first shield plate and a second shield plate, which are made of a magnetic material, are arranged in such a manner to sandwich the three bus bars therebetween together in a thickness direction perpendicular to the width direction. Three magnetic detection elements are arranged between the three bus bars respectively and the first shield plate to detect a magnetic field strength generated by currents flowing through the corresponding bus bars. A conductive plate is disposed between each of the magnetic detection elements and the first shield plate. The conductive plate is disposed in such a manner to sandwich the three bus bars together between the conductive plate and the second shield plate. The conductive plate is made of a nonmagnetic conductive material.Type: GrantFiled: October 11, 2018Date of Patent: December 29, 2020Assignee: Hitachi Metals, Ltd.Inventors: Ken Okuyama, Katsuya Akimoto, Naoki Futakuchi, Haruyasu Komano, Jun Umetsu, Yujiro Tomita
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Patent number: 10794935Abstract: A current sensor includes a bus bar through which a measured current is carried, a pair of shielding plates that include a magnetic material, and are arranged to sandwich the bus bar in a thickness direction of the bus bar, and a magnetic detection element that is arranged between the bus bar and one of the shielding plates, and detects an intensity of magnetic field caused by the current carried through the bus bar. The shielding plate has a length of not less than 20 mm in a length direction of the bus bar, and a width of not less than 24 mm and not more than 38 mm in a width direction orthogonal to the length direction.Type: GrantFiled: March 5, 2018Date of Patent: October 6, 2020Assignee: HITACHI METALS, LTD.Inventors: Ken Okuyama, Katsuya Akimoto, Naoki Futakuchi, Haruyasu Komano, Jun Umetsu, Yujiro Tomita
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Publication number: 20200256895Abstract: An electric current sensor includes bus bars each having a plate shape through which an electric current to be detected flows in a length direction, a housing including a bus bar-holding portion for holding the bus bars with being aligned in a width direction perpendicular to the length direction and a thickness direction of the bus bars, magnetic detection elements, each of which detects a strength of magnetic field generated by the electric current flowing through a corresponding bus bar, and a first shield plate and a second shield plate arranged to sandwich the respective bus bars and the magnetic detection elements in the thickness direction. Each of the first shield plate and the second shield plate is made of a magnetic material. Both the first shield plate and the second shield plate are held directly and commonly by the housing.Type: ApplicationFiled: February 6, 2020Publication date: August 13, 2020Inventors: Ken OKUYAMA, Akitoshi Fujimori, Naoki Futakuchi, Yujiro Tomita, Jun Umetsu
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Publication number: 20200256897Abstract: An electric current sensor includes bus bars, each of which has a plate shape and flows an electric current to be detected in a length direction, a housing for holding the bus bars with being aligned in a width direction perpendicular to the length direction and a thickness direction of the bus bars, magnetic detection elements, each magnetic detection element detecting a strength of magnetic field generated by the electric current flowing through a corresponding bus bar, and a substrate on which the magnetic detection elements are mounted. The substrate is arranged to sandwich the bus bars between the housing and the substrate, and the substrate is fixed to the housing. A fixing portion for fixing the substrate to the housing is provided at both ends of the substrate in the width direction and at least one location between the magnetic detection elements adjacent to each other in the width direction.Type: ApplicationFiled: February 6, 2020Publication date: August 13, 2020Inventors: Akitoshi Fujimori, Ken Okuyama, Naoki Futakuchi, Yujiro Tomita
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Patent number: 10712370Abstract: A current sensor includes plural bus bars which are each formed rectangular in a cross section, a pair of shield plates that include a magnetic material and are arranged so as to collectively sandwich the plural bus bars therebetween, and plural magnetic detection elements that are each arranged between the bus bars and one of the shield plates. A distance d between a detection position of a magnetic field intensity at an arbitrary one of the magnetic detection elements and a center position in the width direction between one of the bus bars corresponding to the arbitrary magnetic detection element and an other of the bus bars adjacent thereto in the width direction satisfies the following expression: d/w+0.023(w/h)?0.36 where a width of the shield plates is w and an interval along a height direction of the shield plates is h.Type: GrantFiled: December 5, 2018Date of Patent: July 14, 2020Assignee: HITACHI METALS, LTD.Inventors: Naoki Futakuchi, Ken Okuyama, Katsuya Akimoto, Haruyasu Komano, Jun Umetsu, Yujiro Tomita
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Patent number: 10677819Abstract: A current sensor includes two bus bars, each of which is formed in a plate shape, the two bus bars being aligned and arranged so as to be spaced apart from each other in a plate width direction thereof, and magnetic detection element arranged opposite the two bus bars, respectively, in a plate thickness direction of the bus bars to detect a magnetic field strength generated by a current flowing through the corresponding bus bars. The magnetic detection element are gradient detection type magnetic detection elements that output a difference between magnetic field strengths detected at two magnetic sensing positions, respectively, and are arranged in such a manner that a detection axis direction thereof is perpendicular to a length direction of the bus bars and is tilted with respect to the plate thickness direction.Type: GrantFiled: October 10, 2018Date of Patent: June 9, 2020Assignee: Hitachi Metals, Ltd.Inventors: Ken Okuyama, Naoki Futakuchi, Haruyasu Komano, Jun Umetsu, Yujiro Tomita
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Publication number: 20200018804Abstract: An electric current sensor includes a plate-like shape bus bar, through which an electric current to be detected is to be passed, one pair of shield plates, which are made of a magnetic material and disposed in such a manner as to sandwich the bus bar between the one pair of the shield plates in a thickness direction of the bus bar, a magnetic detection element, which is disposed between the bus bar and one of the shield plates to detect a strength of a magnetic field to be produced by the electric current to be passed through the bus bar, a core, which is made of a magnetic material and disposed between the one pair of the shield plates, and a winding, which includes one part wound around the core, and an other part wound around either of the shield plates.Type: ApplicationFiled: June 28, 2019Publication date: January 16, 2020Inventors: Ken OKUYAMA, Naoki FUTAKUCHI, Yujiro TOMITA
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Publication number: 20190250193Abstract: A current sensor includes plural bus bars which are each formed rectangular in a cross section, a pair of shield plates that include a magnetic material and are arranged so as to collectively sandwich the plural bus bars therebetween, and plural magnetic detection elements that are each arranged between the bus bars and one of the shield plates. A distance d between a detection position of a magnetic field intensity at an arbitrary one of the magnetic detection elements and a center position in the width direction between one of the bus bars corresponding to the arbitrary magnetic detection element and an other of the bus bars adjacent thereto in the width direction satisfies the following expression: d/w+0.023(w/h)?0.36 where a width of the shield plates is w and an interval along a height direction of the shield plates is h.Type: ApplicationFiled: December 5, 2018Publication date: August 15, 2019Inventors: Naoki FUTAKUCHI, Ken OKUYAMA, Katsuya AKIMOTO, Haruyasu KOMANO, Jun UMETSU, Yujiro TOMITA
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Publication number: 20190187187Abstract: A current sensor includes a bus bar in which a current to be detected flows, a circuit board mounted with a magnetic detection element thereon to detect a strength of a magnetic field generated by a current flowing in the bus bar, and a housing including first and second housings provided in such a manner as to sandwich the bus bar and the circuit board therebetween in a plate thickness direction of the bus bar. The first and second housings include slide guide portions respectively which are relatively slidable in a sloping direction with respect to the plate thickness direction of the bus bar while abutting each other in the plate thickness direction of the bus bar.Type: ApplicationFiled: December 4, 2018Publication date: June 20, 2019Inventors: Jun UMETSU, Naoki FUTAKUCHI, Haruyasu KOMANO, Ken OKUYAMA, Yujiro TOMITA
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Publication number: 20190187183Abstract: A current sensor includes three bus bars arranged in such a manner to be spaced and aligned in a width direction thereof. A first shield plate and a second shield plate, which are made of a magnetic material, are arranged in such a manner to sandwich the three bus bars therebetween together in a thickness direction perpendicular to the width direction. Three magnetic detection elements are arranged between the three bus bars respectively and the first shield plate to detect a magnetic field strength generated by currents flowing through the corresponding bus bars. A conductive plate is disposed between each of the magnetic detection elements and the first shield plate. The conductive plate is disposed in such a manner to sandwich the three bus bars together between the conductive plate and the second shield plate. The conductive plate is made of a nonmagnetic conductive material.Type: ApplicationFiled: October 11, 2018Publication date: June 20, 2019Applicant: Hitachi Metals, Ltd.Inventors: Ken OKUYAMA, Katsuya AKIMOTO, Naoki FUTAKUCHI, Haruyasu KOMANO, Jun UMETSU, Yujiro TOMITA
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Publication number: 20190170793Abstract: A current sensor includes first and second bus bars aligned and arranged in such a manner to be spaced from each other in a plate width direction, a third bus bar arranged in such a manner that a plate thickness direction thereof coincides with a plate thickness direction of the first and second bus bars and a length direction thereof is orthogonal to a length direction of the first and second bus bars, first and second magnetic detection elements arranged opposite the first and second bus bars respectively in the plate thickness direction, and a third magnetic detection element arranged opposite the third bus bar in the plate thickness direction. The first and second magnetic detection elements are gradient detection type magnetic detection elements and are arranged in such a manner that a detection axis direction thereof is perpendicular to the length direction of the first and second bus bars and is tilted with respect to the plate thickness direction of the first and second bus bars.Type: ApplicationFiled: October 11, 2018Publication date: June 6, 2019Applicant: Hitachi Metals, Ltd.Inventors: Ken OKUYAMA, Naoki FUTAKUCHI, Haruyasu KOMANO, Jun UMETSU, Yujiro TOMITA
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Publication number: 20190170794Abstract: A current sensor includes two bus bars, each of which is formed in a plate shape, the two bus bars being aligned and arranged so as to be spaced apart from each other in a plate width direction thereof, and magnetic detection element arranged opposite the two bus bars, respectively, in a plate thickness direction of the bus bars to detect a magnetic field strength generated by a current flowing through the corresponding bus bars. The magnetic detection element are gradient detection type magnetic detection elements that output a difference between magnetic field strengths detected at two magnetic sensing positions, respectively, and are arranged in such a manner that a detection axis direction thereof is perpendicular to a length direction of the bus bars and is tilted with respect to the plate thickness direction.Type: ApplicationFiled: October 10, 2018Publication date: June 6, 2019Applicant: Hitachi Metals, Ltd.Inventors: Ken OKUYAMA, Naoki FUTAKUCHI, Haruyasu KOMANO, Jun UMETSU, Yujiro TOMITA
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Patent number: 10209277Abstract: A current sensor includes, a bus bar through which a current flows, a magnetic detection element detecting a magnetic field intensity generated by the current, first and second shielding plates arranged so as to sandwich the bus bar between the first and second shielding plates, a first conductive plate made of a conductive nonmagnetic material, arranged between the bus bar and the first shielding plate, and a second conductive plate made of the conductive nonmagnetic material, arranged between the bus bar and the second shielding plate, wherein the magnetic detection element is arranged at a first conductive plate-side. A distance between the first conductive plate and the bus bar is longer than a distance between the second conductive plate and the bus bar. The first conductive plate includes a slit formed in the first conductive plate at an overlapping position, and the slit pierces the first conductive plate.Type: GrantFiled: June 27, 2017Date of Patent: February 19, 2019Assignee: HITACHI METALS, LTD.Inventors: Ken Okuyama, Katsuya Akimoto, Naoki Futakuchi, Jun Umetsu, Yujiro Tomita
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Publication number: 20180284162Abstract: A current sensor includes a bus bar through which a measured current is carried, a pair of shielding plates that include a magnetic material, and are arranged to sandwich the bus bar in a thickness direction of the bus bar, and a magnetic detection element that is arranged between the bus bar and one of the shielding plates, and detects an intensity of magnetic field caused by the current carried through the bus bar. The shielding plate has a length of not less than 20 mm in a length direction of the bus bar, and a width of not less than 24 mm and not more than 38 mm in a width direction orthogonal to the length direction.Type: ApplicationFiled: March 5, 2018Publication date: October 4, 2018Inventors: Ken Okuyama, Katsuya Akimoto, Naoki Futakuchi, Haruyasu Komano, Jun Umetsu, Yujiro Tomita
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Patent number: 10088505Abstract: A current sensor includes a busbar carrying an electric current to be measured, a magnetic sensing element for detecting intensity of a magnetic field generated by the current flowing through the busbar, and a pair of shield plates that include magnetic materials and are arranged to sandwich the busbar in a thickness direction of the busbar. The shield plates include a conductive shield plate including a conductive magnetic material and a non-conductive shield plate including a non-conductive magnetic material. The conductive shield plate includes a slit penetrating therethrough. The magnetic sensing element is arranged at a position where the magnetic sensing element overlaps the slits in the thickness direction and does not overlap the conductive shield plate in the thickness direction.Type: GrantFiled: March 28, 2017Date of Patent: October 2, 2018Assignee: HITACHI METALS, LTD.Inventors: Ken Okuyama, Katsuya Akimoto, Naoki Futakuchi, Yujiro Tomita
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Patent number: 10060953Abstract: A current sensor includes a busbar carrying an electric current to be measured, a magnetic sensing element for detecting intensity of a magnetic field generated by the current flowing through the busbar, and a pair of shield plates that include a magnetic material and are arranged to sandwich the busbar in a thickness direction of the busbar. The busbar includes a through-hole penetrating therethrough and current paths formed on both sides of the through-hole, the magnetic sensing element is arranged at a position overlapping the through-hole in the thickness direction of the busbar. The busbar is arranged in a space between the pair of shield plates such that the center in the thickness direction is located at a position offset from the center of the space in the thickness direction.Type: GrantFiled: March 28, 2017Date of Patent: August 28, 2018Assignee: HITACHI METALS, LTD.Inventors: Ken Okuyama, Naoki Futakuchi, Katsuya Akimoto, Yujiro Tomita
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Publication number: 20170370969Abstract: A current sensor includes, a bus bar through which a current flows, a magnetic detection element detecting a magnetic field intensity generated by the current, first and second shielding plates arranged so as to sandwich the bus bar between the first and second shielding plates, a first conductive plate made of a conductive nonmagnetic material, arranged between the bus bar and the first shielding plate, and a second conductive plate made of the conductive nonmagnetic material, arranged between the bus bar and the second shielding plate, wherein the magnetic detection element is arranged at a first conductive plate-side. A distance between the first conductive plate and the bus bar is longer than a distance between the second conductive plate and the bus bar. The first conductive plate includes a slit formed in the first conductive plate at an overlapping position, and the slit pierces the first conductive plate.Type: ApplicationFiled: June 27, 2017Publication date: December 28, 2017Inventors: Ken OKUYAMA, Katsuya Akimoto, Naoki Futakuchi, Jun Umetsu, Yujiro Tomita
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Publication number: 20170285075Abstract: A current sensor includes a busbar carrying an electric current to be measured, a magnetic sensing element for detecting intensity of a magnetic field generated by the current flowing through the busbar, and a pair of shield plates that include a magnetic material and are arranged to sandwich the busbar in a thickness direction of the busbar. The busbar includes a through-hole penetrating therethrough and current paths formed on both sides of the through-hole, the magnetic sensing element is arranged at a position overlapping the through-hole in the thickness direction of the busbar. The busbar is arranged in a space between the pair of shield plates such that the center in the thickness direction is located at a position offset from the center of the space in the thickness direction.Type: ApplicationFiled: March 28, 2017Publication date: October 5, 2017Inventors: Ken OKUYAMA, Naoki FUTAKUCHI, Katsuya AKIMOTO, Yujiro TOMITA