Patents by Inventor Keiichi Tomizawa
Keiichi Tomizawa 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: 12068090Abstract: An insulated wire, including: a conductor and an insulating film covering the conductor; in which at least one insulating layer constituting the insulating film contains: a thermosetting resin A, and a resin B that is ranked lower than the thermosetting resin A in a tribo-electric series.Type: GrantFiled: February 25, 2022Date of Patent: August 20, 2024Assignee: ESSEX FURUKAWA MAGNET WIRE JAPAN CO., LTD.Inventors: Ayumi Yamamoto, Keisuke Ikeda, Keiichi Tomizawa
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Patent number: 11437163Abstract: An insulated wire, containing a conductor and an insulating film provided in contact with the conductor, in which the insulating film provided in contact with the conductor contains a polyimide resin, and the polyimide resin contains a constituting unit (A) derived from 2,2-bis[4-(4-amininophenoxy)phenyl]propane and a constituting unit (B) derived from 9,9-bis(4-aminophenyl)fluorene as a diamine-derived constituting unit; the polyimide resin has an imide group concentration of 25.0% or less; and the ratio of the content of the constituting unit (B) occupied in the diamine-derived constituting unit in the polyimide resin is 1 to 40 mol %.Type: GrantFiled: September 29, 2020Date of Patent: September 6, 2022Assignee: ESSEX FURUKAWA MAGNET WIRE JAPAN CO., LTD.Inventors: Natsuko Hara, Keiichi Tomizawa, Hideo Fukuda
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Publication number: 20220181043Abstract: An insulated wire, including: a conductor and an insulating film covering the conductor; in which at least one insulating layer constituting the insulating film contains: a thermosetting resin A, and a resin B that is ranked lower than the thermosetting resin A in a tribo-electric series.Type: ApplicationFiled: February 25, 2022Publication date: June 9, 2022Applicant: ESSEX FURUKAWA MAGNET WIRE JAPAN CO., LTD.Inventors: Ayumi YAMAMOTO, Keisuke IKEDA, Keiichi TOMIZAWA
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Publication number: 20220165451Abstract: Provided is an electrical conducting wire in which eddy current loss is effectively suppressed, mechanical strength is excellent, and electrical conductivity is also excellent while aluminum strands that are not coated with insulating resin are used as strands constituting a split conductor. An electrical conducting wire, including: a split conductor composed of multiple aluminum strands arranged in parallel to each other or multiple aluminum strands twisted into a helix, wherein each of the strands contains 0.01 to 0.4 mass % of Fe, 0.3 to 0.5 mass % of Cu, 0.04 to 0.3 mass % of Mg, 0.02 to 0.3 mass % of Si, and 0.001 to 0.01 mass % of Ti and V in total, with the balance being Al and inevitable impurities; and wherein each of the strands is not coated with an insulating resin.Type: ApplicationFiled: February 10, 2022Publication date: May 26, 2022Applicant: Essex Furukawa Magnet Wire Japan Co., Ltd.Inventors: Keiichi TOMIZAWA, Akira TACHIBANA, Daisuke MUTO
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Patent number: 11217364Abstract: An insulated wire containing a thermoplastic resin layer (A) as a covering layer directly or indirectly on a rectangular conductor, in which the insulated wire has at least one protruding part which is continuous in a longitudinal direction of said insulated wire, on a surface of a portion of the thermoplastic resin layer (A), which portion corresponds to at least one side of a cross-section of the insulated wire, said protruding part and a flat part of the surface having the protruding part forms a curved portion with a radius of curvature of 0.01 to 0.75 mm in the cross-section of the insulated wire, and a lateral face of the protruding part has a slope of less than 90° to the flat part of the surface having the protruding part in the cross-section of the insulated wire, a coil produced by processing the insulated wire by winding, and an electric/electronic equipment comprising the coil.Type: GrantFiled: July 22, 2020Date of Patent: January 4, 2022Assignee: ESSEX FURUKAWA MAGNET WIRE JAPAN CO., LTD.Inventors: Keiichi Tomizawa, Daisuke Muto, Satoshi Saito
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Publication number: 20210343446Abstract: An insulated wire including: a conductor; and an insulating film provided on an outer periphery of the conductor, wherein the insulating film satisfies the following relation between a relative permittivity (?) of the insulating film at 0.2 atm and a relative permittivity (?0) of an outermost layer of the insulating film at 0.2 atm. ??3.0 and ?0/??1.2.Type: ApplicationFiled: July 8, 2021Publication date: November 4, 2021Applicant: Essex Furukawa Magnet Wire Japan Co., Ltd.Inventors: Daisuke MUTO, Keiichi TOMIZAWA, Hideo FUKUDA
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Patent number: 11145436Abstract: An assembled wire has a substantially rectangular cross section, and is formed by assembling a plurality of strands. Each strand has a conductor portion and a strand insulating layer covering the conductor portion. At least a part of the assembled plurality of strands in the longitudinal direction is covered with an outer insulating layer. The strand is formed as follows. First, the strand insulating layer is coated on the outer periphery of the conductor portion. A large number of voids are formed in a resin constituting the strand insulating layer. From this state, the strand is formed, for example, by collapsing the strand insulating layer by heating and pressurizing. At this time, it is possible to uniformly collapse the strand insulating layer by crushing the internal voids. Therefore, the voids in the strand are crushed and flattened in the thickness direction of the strand insulating layer over the entire periphery.Type: GrantFiled: December 19, 2019Date of Patent: October 12, 2021Assignee: ESSEX FURUKAWA MAGNET WIRE JAPAN COL, LTD.Inventors: Keisuke Ikeda, Keiichi Tomizawa, Daisuke Muto, Hideo Fukuda
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Patent number: 10978219Abstract: Provided is an assembled wire 10 having a substantially rectangular cross section, and is formed by assembling a plurality of strands 7. Each strand 7 has a conductor portion 11 and a strand insulating layer 13 covering the conductor portion 11. The strand insulating layer 13 preferably contains at least one kind of resin in which 50% weight loss in Tg-DTA occurs at from 300° C. to 500° C. The strand insulating layer 13 contains particles. The particles are particles having volume resistivity of 1×106 ?·cm or more, and, for example, inorganic substances such as silica, titania, alumina, aluminum nitride, magnesium oxide, silicon nitride, and silicon carbide; and resins such as silicone are applicable.Type: GrantFiled: May 28, 2020Date of Patent: April 13, 2021Assignee: ESSEX FURUKAWA MAGNET WIRE JAPAN CO., LTD.Inventors: Keiichi Tomizawa, Akira Tachibana, Keisuke Ikeda, Daisuke Muto, Hideo Fukuda
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Publication number: 20210012922Abstract: An insulated wire, containing a conductor and an insulating film provided in contact with the conductor, in which the insulating film provided in contact with the conductor contains a polyimide resin, and the polyimide resin contains a constituting unit (A) derived from 2,2-bis[4-(4-amininophenoxy)phenyl]propane and a constituting unit (B) derived from 9,9-bis(4-aminophenyl)fluorene as a diamine-derived constituting unit; the polyimide resin has an imide group concentration of 25.0% or less; and the ratio of the content of the constituting unit (B) occupied in the diamine-derived constituting unit in the polyimide resin is 1 to 40 mol %.Type: ApplicationFiled: September 29, 2020Publication date: January 14, 2021Applicants: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Natsuko HARA, Keiichi TOMIZAWA, Hideo FUKUDA
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Publication number: 20210012921Abstract: An insulated wire, containing a conductor, and an insulating film provided on the periphery of the conductor, in which the insulating film contains a polyimide resin, and the polyimide resin contains the following constituting unit (a) as a tetracarboxylic dianhydride-derived constituting unit and the following constituting unit (b) as a diamine-derived constituting unit, among the constituting units of the polyimide: (a) a constituting unit having a skeleton derived from pyromellitic anhydride and/or a constituting unit having a skeleton derived from 3,3?,4,4?-biphenyltetracarboxylic dianhydride; and (b) a constituting unit having a skeleton derived from 9,9-bis(4-aminophenyl)fluorene.Type: ApplicationFiled: September 29, 2020Publication date: January 14, 2021Applicants: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Keiichi TOMIZAWA, Natsuko HARA, Hideo FUKUDA
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Publication number: 20210005346Abstract: An insulated wire containing a thermoplastic resin layer (A) as a covering layer directly or indirectly on a rectangular conductor, in which the insulated wire has at least one protruding part which is continuous in a longitudinal direction of said insulated wire, on a surface of a portion of the thermoplastic resin layer (A), which portion corresponds to at least one side of a cross-section of the insulated wire, said protruding part and a flat part of the surface having the protruding part forms a curved portion with a radius of curvature of 0.01 to 0.75 mm in the cross-section of the insulated wire, and a lateral face of the protruding part has a slope of less than 90° to the flat part of the surface having the protruding part in the cross-section of the insulated wire, a coil produced by processing the insulated wire by winding, and an electric/electronic equipment comprising the coil.Type: ApplicationFiled: July 22, 2020Publication date: January 7, 2021Applicants: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Keiichi TOMIZAWA, Daisuke MUTO, Satoshi SAITO
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Publication number: 20200365294Abstract: Provided is an assembled wire 10 having a substantially rectangular cross section, and is formed by assembling a plurality of strands 7. Each strand 7 has a conductor portion 11 and a strand insulating layer 13 covering the conductor portion 11. The strand insulating layer 13 preferably contains at least one kind of resin in which 50% weight loss in Tg-DTA occurs at from 300° C. to 500° C. The strand insulating layer 13 contains particles. The particles are particles having volume resistivity of 1×106 ?·cm or more, and, for example, inorganic substances such as silica, titania, alumina, aluminum nitride, magnesium oxide, silicon nitride, and silicon carbide; and resins such as silicone are applicable.Type: ApplicationFiled: May 28, 2020Publication date: November 19, 2020Applicants: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Keiichi TOMIZAWA, Akira TACHIBANA, Keisuke IKEDA, Daisuke MUTO, Hideo FUKUDA
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Publication number: 20200126688Abstract: An assembled wire has a substantially rectangular cross section, and is formed by assembling a plurality of strands. Each strand has a conductor portion and a strand insulating layer covering the conductor portion. At least a part of the assembled plurality of strands in the longitudinal direction is covered with an outer insulating layer. The strand is formed as follows. First, the strand insulating layer is coated on the outer periphery of the conductor portion. At this time, a large number of voids are formed in a resin constituting the strand insulating layer. From this state, the strand is formed, for example, by collapsing the strand insulating layer by heating and pressurizing. At this time, it is possible to uniformly collapse the strand insulating layer by crushing the internal voids. Therefore, the voids in the strand are crushed and flattened in the thickness direction of the strand insulating layer over the entire periphery.Type: ApplicationFiled: December 19, 2019Publication date: April 23, 2020Inventors: Keisuke Ikeda, Keiichi Tomizawa, Daisuke Muto, Hideo Fukuda
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Patent number: 10566109Abstract: An insulated wire, containing: a conductor having a rectangular cross-section; and an insulating coated film having at least two insulating layers laminated together on the conductor, wherein the laminated insulating coated film is composed of: an enamel insulating layer formed from a thermosetting resin on the outer periphery of the conductor, and an extruded insulating layer formed from a thermoplastic resin on the outer side of the enamel insulating layer, wherein the thickness of the enamel insulating layer is 50 ?m or more, and wherein the total thickness (T) and the relative permittivity (?) at 100° C. of the laminated insulating coated film; and the maximum thickness (Tmax), and the maximum value (?max) and the minimum value (?min) of the relative permittivity at 100° C. of one layer among the laminated insulating layers; satisfy all of the following relations: T?100 ?m??(1.1) Tmax?100 ?m??(1.2) 1.5???3.5??(2.1) 1.0??max/?min?1.2??(2.2) a coil; and an electrical or electronic equipment.Type: GrantFiled: September 17, 2018Date of Patent: February 18, 2020Assignees: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Daisuke Muto, Makoto Oya, Keiichi Tomizawa, Hideo Fukuda, Tsuneo Aoi
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Patent number: 10418151Abstract: An inverter surge-resistant insulated wire comprising a conductor and an enamel resin-insulating laminate that has a foamed region including cells and a non-foamed region including no cells on at least one surface of the foamed region on the conductor, wherein the foamed region is configured such that a non-cell layer including no cells has cell layers formed of closed cells on both surface sides of the non-cell layer, a thickness of the non-cell layer is larger than a thickness of a partition wall among the closed cells, and 5 to 60% of a thickness of the foamed region, and at least 10 the cell layer in the foamed region is formed of a thermosetting resin; an inverter surge-resistant insulated wire having a conductor and the enamel resin-insulating laminate; and electric/electronic equipment.Type: GrantFiled: July 22, 2015Date of Patent: September 17, 2019Assignees: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Daisuke Muto, Makoto Oya, Keiichi Tomizawa
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Publication number: 20190027271Abstract: An insulated wire, containing: a conductor having a rectangular cross-section; and an insulating coated film having at least two insulating layers laminated together on the conductor, wherein the laminated insulating coated film is composed of: an enamel insulating layer formed from a thermosetting resin on the outer periphery of the conductor, and an extruded insulating layer formed from a thermoplastic resin on the outer side of the enamel insulating layer, wherein the thickness of the enamel insulating layer is 50 ?m or more, and wherein the total thickness (T) and the relative permittivity (?) at 100° C. of the laminated insulating coated film; and the maximum thickness (Tmax), and the maximum value (?max) and the minimum value (?min) of the relative permittivity at 100° C. of one layer among the laminated insulating layers; satisfy all of the following relations: T?100 ?m ??(1.1) Tmax?100 ?m ??(1.2) 1.5???3.5 ??(2.1) 1.0??max/?min?1.2 ??(2.Type: ApplicationFiled: September 17, 2018Publication date: January 24, 2019Applicants: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Daisuke MUTO, Makoto OYA, Keiichi TOMIZAWA, Hideo FUKUDA, Tsuneo AOI
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Patent number: 10020092Abstract: An insulated wire which comprises an aluminum conductor, having: an adhesion layer formed by directly baking, on the aluminum conductor, varnish containing a carboxy group; an insulation layer as an outer layer of the adhesion layer; and a reinforcement insulation layer as an outer layer of the insulation layer; and a method of producing the same.Type: GrantFiled: December 2, 2016Date of Patent: July 10, 2018Assignees: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Makoto Oya, Ryousuke Obika, Keiichi Tomizawa
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Patent number: 9728296Abstract: An insulated wire having a conductor, a foamed insulating layer containing a thermosetting resin having cells, coated directly or indirectly onto the outer periphery of the conductor and an outer insulating layer containing a thermoplastic resin having a melting point of 240° C. or higher when the thermoplastic resin is a crystalline resin or a thermoplastic resin having a glass transition temperature of 240° C. or higher when the thermoplastic resin is a non-crystalline resin; electrical equipment using the insulated wire; and a method of producing the insulated wire, containing a step of forming a foamed insulating layer by applying a varnish for forming the foamed insulating layer on the outer periphery of a conductor, by generating foams during baking and a step of forming an outer insulating layer by extrusion-molding a thermoplastic resin composition for forming the outer insulating layer on the outer periphery of the foamed insulating layer.Type: GrantFiled: April 30, 2015Date of Patent: August 8, 2017Assignees: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Makoto Oya, Makoto Onodera, Keiichi Tomizawa
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Patent number: 9728301Abstract: An insulated wire having a conductor, and a multilayer insulating layer composed of two or more layers coating the conductor, wherein the innermost insulating layer of the multilayer insulating layer is an insulating layer formed of a crystalline thermoplastic resin having a storage elastic modulus of 10 MPa or more at 300° C. and outer insulating layer(s) other than the innermost insulating layer include(s) an insulating layer formed of a crystalline thermoplastic resin having a melting point of 260° C. or higher and a storage elastic modulus of 1,000 MPa or more at 25° C., and adjacent insulating layers have a relationship such that the storage elastic modulus at 25° C. of the thermoplastic resin of the outer insulating layer is equal to or smaller than the inner insulating layer; and electric/electronic equipment formed using the insulated wire as a winding and/or lead wire of a transformer that is incorporated into the electric/electronic equipment.Type: GrantFiled: April 16, 2015Date of Patent: August 8, 2017Assignees: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Keisuke Ikeda, Hideo Fukuda, Daisuke Muto, Keiichi Tomizawa
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Publication number: 20170084361Abstract: An insulated wire which comprises an aluminum conductor, having: an adhesion layer formed by directly baking, on the aluminum conductor, varnish containing a carboxy group; an insulation layer as an outer layer of the adhesion layer; and a reinforcement insulation layer as an outer layer of the insulation layer; and a method of producing the same.Type: ApplicationFiled: December 2, 2016Publication date: March 23, 2017Applicants: FURUKAWA ELECTRIC CO., LTD., FURUKAWA MAGNET WIRE CO., LTD.Inventors: Makoto OYA, Ryousuke OBIKA, Keiichi TOMIZAWA