Patents by Inventor Jun Sunakawa
Jun Sunakawa 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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Publication number: 20220055099Abstract: A method for producing an Fe-based nanocrystalline alloy ribbon, the method including a step of supplying a molten Fe-based alloy onto a rotating chill roll, and rapidly solidifying the molten Fe-based alloy that has been supplied onto the chill roll, thereby obtaining an Fe-based amorphous alloy ribbon having a free solidified surface and a roll contact surface, and a step of heat-treating the Fe-based amorphous alloy ribbon, thereby obtaining an Fe-based nanocrystalline alloy ribbon; wherein an outer peripheral part of the chill roll is composed of a Cu alloy, and a thermal conductivity of the outer peripheral part is from 70 W/(m·K) to 225 W/(m·K).Type: ApplicationFiled: September 24, 2019Publication date: February 24, 2022Inventors: Jun SUNAKAWA, Nakao MORITSUGU
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Patent number: 10987729Abstract: A method of manufacturing an Fe-based amorphous alloy ribbon includes forming a coated film of a molten alloy on a peripheral surface of a chill roll that has been subjected to polishing using a polishing brush roll, cooling the coated film on the peripheral surface, and then winding the Fe-based amorphous alloy ribbon, which has been peeled off by a peeling means, on a wind-up roll, to obtain a wound body of an Fe-based amorphous alloy ribbon. The polishing brush roll includes a roll axis member and a polishing brush that is equipped with a plurality of brush bristles and satisfies the following condition (1) and condition (2) while rotating axially in a reverse direction to the chill roll. Condition (1): Free length of brush bristles is more than 30 mm but no more than 50 mm. Condition (2): Density of brush bristles at the brush bristle tip is more than 0.30 bristles/mm2 but no more than 0.60 bristles/mm2.Type: GrantFiled: February 14, 2018Date of Patent: April 27, 2021Assignee: HITACHI METALS, LTD.Inventor: Jun Sunakawa
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Patent number: 10661334Abstract: The invention provides a method of producing an amorphous alloy ribbon, the method including a step of producing an amorphous alloy ribbon by discharging a molten alloy through a rectangular opening of a molten metal nozzle having a molten metal flow channel along which the molten alloy flows, the opening being an end of the molten metal flow channel, onto a surface of a rotating chill roll, in which, among wall surfaces of the molten metal flow channel, a maximum height Rz(t) of a surface t, which is a wall surface parallel to a flow direction of the molten alloy and to a short side direction of the opening, is 10.5 ?m or less.Type: GrantFiled: October 26, 2016Date of Patent: May 26, 2020Assignee: HITACHI METALS, LTD.Inventors: Hiroshi Shibasaki, Takayuki Motegi, Hajime Itagaki, Jun Sunakawa, Yoshio Bizen
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Publication number: 20190358699Abstract: A method of manufacturing an Fe-based amorphous alloy ribbon includes forming a coated film of a molten alloy on a peripheral surface of a chill roll that has been subjected to polishing using a polishing brush roll, cooling the coated film on the peripheral surface, and then winding the Fe-based amorphous alloy ribbon, which has been peeled off by a peeling means, on a wind-up roll, to obtain a wound body of an Fe-based amorphous alloy ribbon. The polishing brush roll includes a roll axis member and a polishing brush that is equipped with a plurality of brush bristles and satisfies the following condition (1) and condition (2) while rotating axially in a reverse direction to the chill roll. Condition (1): Free length of brush bristles is more than 30 mm but no more than 50 mm. Condition (2): Density of brush bristles at the brush bristle tip is more than 0.30 bristles/mm2 but no more than 0.60 bristles/mm2.Type: ApplicationFiled: February 14, 2018Publication date: November 28, 2019Applicant: HITACHI METALS, LTD.Inventor: Jun SUNAKAWA
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Publication number: 20180369902Abstract: The invention provides an Fe-based amorphous alloy ribbon having a thickness of from 10 ?m to 30 ?m, in which a roughness curve of a central part in a ribbon width direction of the free solidified surface satisfies Rp?3.0, Rv?3.0, 7?Pn?30, 7?Vn?30, 0.9?(VA/PA)<1.4, and the like, the roughness curve being measured according to JIS B 0601: 2013 by applying 20 mm in a ribbon length direction as a reference length and taking 0.8 mm as a cut-off value. Rp represents a maximum profile peak height (?m), Rv represents a maximum profile valley depth (?m), Pn represents a number of profile peaks having a height of from 0.5 ?m to 3.0 ?m, Vn represents a number of profile valleys having a depth of from 0.5 ?m to 3.0 ?m, PA represents an average of heights of five profile peaks from a highest profile peak to a fifth highest profile peak, and VA represents an average of depths of five profile valleys from a deepest profile valley to a fifth deepest profile valley.Type: ApplicationFiled: November 2, 2016Publication date: December 27, 2018Inventor: Jun SUNAKAWA
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Patent number: 9604278Abstract: The invention provides a method of producing an amorphous alloy ribbon, the method including a step of producing an amorphous alloy ribbon by discharging a molten alloy through a rectangular opening of a molten metal nozzle having a molten metal flow channel along which the molten alloy flows, the opening being an end of the molten metal flow channel, onto a surface of a rotating chill roll, in which, among wall surfaces of the molten metal flow channel, a maximum height Rz(t) of a surface t, which is a wall surface parallel to a flow direction of the molten alloy and to a short side direction of the opening, is 10.5 ?m or less.Type: GrantFiled: March 7, 2013Date of Patent: March 28, 2017Assignee: HITACHI METALS, LTD.Inventors: Hiroshi Shibasaki, Takayuki Motegi, Hajime Itagaki, Jun Sunakawa, Yoshio Bizen
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Publication number: 20170044648Abstract: The invention provides a method of producing an amorphous alloy ribbon, the method including a step of producing an amorphous alloy ribbon by discharging a molten alloy through a rectangular opening of a molten metal nozzle having a molten metal flow channel along which the molten alloy flows, the opening being an end of the molten metal flow channel, onto a surface of a rotating chill roll, in which, among wall surfaces of the molten metal flow channel, a maximum height Rz(t) of a surface t, which is a wall surface parallel to a flow direction of the molten alloy and to a short side direction of the opening, is 10.5 ?m or less.Type: ApplicationFiled: October 26, 2016Publication date: February 16, 2017Applicant: HITACHI METALS, LTD.Inventors: Hiroshi SHIBASAKI, Takayuki MOTEGI, Hajime ITAGAKI, Jun SUNAKAWA, Yoshio BIZEN
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Publication number: 20150027592Abstract: The invention provides a method of producing an amorphous alloy ribbon, the method including a step of producing an amorphous alloy ribbon by discharging a molten alloy through a rectangular opening of a molten metal nozzle having a molten metal flow channel along which the molten alloy flows, the opening being an end of the molten metal flow channel, onto a surface of a rotating chill roll, in which, among wall surfaces of the molten metal flow channel, a maximum height Rz(t) of a surface t, which is a wall surface parallel to a flow direction of the molten alloy and to a short side direction of the opening, is 10.5 ?m or less.Type: ApplicationFiled: March 7, 2013Publication date: January 29, 2015Applicant: HITACHI METALS, LTD.Inventors: Hiroshi Shibasaki, Takayuki Motegi, Hajime Itagaki, Jun Sunakawa, Yoshio Bizen
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Patent number: 7012527Abstract: A resonator for use in a marker in an electronic article surveillance system having an amorphous alloy ribbon having a width of 7 mm or less and a thickness of 18 ?m to 23 ?m. The amorphous alloy ribbon preferably has an average surface roughness Ra of 0.45 ?m or less.Type: GrantFiled: August 19, 2003Date of Patent: March 14, 2006Assignee: Hitachi Metals, Ltd.Inventors: Jun Sunakawa, Daichi Azuma, Yoshio Bizen
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Patent number: 6749700Abstract: An amorphous alloy ribbon free from embrittlement and crystallization and having excellent surface conditions and shape in edge portions is produced by (a) preparing an alloy melt having a composition comprising 13 atomic % or less of B and 15 atomic % or less of at least one selected from the group consisting of transition elements of Groups 4A, 5A and 6A, the balance being substantially Fe; (b) ejecting the alloy melt at a temperature from the melting point of the alloy +50° C. to the melting point of the alloy +250° C. through a nozzle onto the cooling roll rotating at a peripheral speed of 35 m/second or less, a distance between a tip end of the nozzle and the cooling roll being 200 &mgr;m or less; (c) starting to supply a gas based on CO2 to the alloy melt after the surface temperature of the cooling roll has become substantially constant; and (d) grinding the cooling roll while supplying the gas based on CO2.Type: GrantFiled: February 13, 2002Date of Patent: June 15, 2004Assignee: Hitachi Metals Ltd.Inventors: Jun Sunakawa, Yoshio Bizen, Michihiro Nagao
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Publication number: 20040036607Abstract: A resonator constituted by an amorphous alloy ribbon having a width of 7 mm or less and a thickness of 18 &mgr;m to 23 &mgr;m. The amorphous alloy ribbon preferably has an average surface roughness Ra of 0.45 &mgr;m or less.Type: ApplicationFiled: August 19, 2003Publication date: February 26, 2004Applicant: HITACHI METALS, LTD.Inventors: Jun Sunakawa, Daichi Azuma, Yoshio Bizen
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Patent number: 6648994Abstract: The present invention provides a method for producing a Fe-based amorphous alloy ribbon comprising the steps of: ejecting a molten Fe-based alloy containing 10 atomic % or less of B onto a cooling roll to solidify the molten Fe-based alloy; and peeling the solidified Fe-based alloy from the cooling roll when the solidified Fe-based alloy has a temperature of 100 to 300° C. A Fe-based amorphous alloy ribbon having no crystalline phase is stably, continuously produced without breakage by this method.Type: GrantFiled: December 28, 2000Date of Patent: November 18, 2003Assignee: Hitachi Metals, Ltd.Inventors: Jun Sunakawa, Yoshio Bizen, Shunsuke Arakawa
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Publication number: 20030041931Abstract: An amorphous alloy ribbon free from embrittlement and crystallization and having excellent surface conditions and shape in edge portions is produced by (a) preparing an alloy melt having a composition comprising 13 atomic % or less of B and 15 atomic % or less of at least one selected from the group consisting of transition elements of Groups 4A, 5A and 6A, the balance being substantially Fe; (b) ejecting the alloy melt at a temperature from the melting point of the alloy +50° C. to the melting point of the alloy +250° C. through a nozzle onto the cooling roll rotating at a peripheral speed of 35 m/second or less, a distance between a tip end of the nozzle and the cooling roll being 200 &mgr;m or less; (c) starting to supply a gas based on CO2 to the alloy melt after the surface temperature of the cooling roll has become substantially constant; and (d) grinding the cooling roll while supplying the gas based on CO2.Type: ApplicationFiled: February 13, 2002Publication date: March 6, 2003Applicant: HITACHI METALS, LTD.Inventors: Jun Sunakawa, Yoshio Bizen, Michihiro Nagao
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Patent number: 6405787Abstract: A method for winding a rapidly quenched thin metal ribbon has the steps of (1) ejecting a molten metal onto a rotating cooling roll to rapidly solidify the molten metal to form a thin metal ribbon, (2) peeling the thin metal ribbon from the cooling roll to let the thin metal ribbon to freely move from the cooling roll, and (3) bringing a rotating winding roll having an adhesive thereon into contact with the freely moving thin metal ribbon at an intermediate point thereof, so that the thin metal ribbon is wound around the winding roll with an excess portion of the thin metal ribbon forward of the intermediate point cut off.Type: GrantFiled: December 21, 2000Date of Patent: June 18, 2002Assignee: Hitachi Metals, Ltd.Inventors: Yoshio Bizen, Michihiro Nagao, Jun Sunakawa, Shunsuke Arakawa
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Publication number: 20010007266Abstract: The present invention provides a method for producing a Fe-based amorphous alloy ribbon comprising the steps of: ejecting a molten Fe-based alloy containing 10 atomic % or less of B onto a cooling roll to solidify the molten Fe-based alloy; and peeling the solidified Fe-based alloy from the cooling roll when the solidified Fe-based alloy has a temperature of 100 to 300° C. A Fe-based amorphous alloy ribbon having no crystalline phase is stably, continuously produced without breakage by this method.Type: ApplicationFiled: December 28, 2000Publication date: July 12, 2001Inventors: Jun Sunakawa, Yoshio Bizen, Shunsuke Arakawa
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Publication number: 20010006100Abstract: A method for winding a rapidly quenched thin metal ribbon has the steps of (1) ejecting a molten metal onto a rotating cooling roll to rapidly solidify the molten metal to form a thin metal ribbon, (2) peeling the thin metal ribbon from the cooling roll to let the thin metal ribbon to freely move from the cooling roll, and (3) bringing a rotating winding roll having an adhesive thereon into contact with the freely moving thin metal ribbon at an intermediate point thereof, so that the thin metal ribbon is wound around the winding roll with an excess portion of the thin metal ribbon forward of the intermediate point cut off.Type: ApplicationFiled: December 21, 2000Publication date: July 5, 2001Inventors: Yoshio Bizen, Michihiro Nagao, Jun Sunakawa, Shunsuke Arakawa
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Patent number: 6246172Abstract: There is provided a high-performance magnetic core with a high &mgr;′Qf-value for an RF accelerating. The strip wound magnetic core has a thin strip of nanocrystalline soft magnetic alloy, whose bcc solid solution with an average grain size less than 100 nm has a volume fraction more than 50% of the whole structure of the alloy, and around which an interlayer insulation film at least on one side thereof. A gap is formed in at least a part of a magnetic path of the magnetic core. Stack cores formed by arranging in series a plurality of the magnetic cores are oppositely installed via a high-voltage gap, making it possible to provide an excellent RF accelerating cavity.Type: GrantFiled: August 24, 1999Date of Patent: June 12, 2001Assignee: Hitachi Metals, Ltd.Inventors: Yoshio Bizen, Jun Sunakawa, Shunsuke Arakawa
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Patent number: 5821000Abstract: A composite magnetic member formed of a single material having a ferromagnetic section with high soft magnetism and a non-magnetic or the like section with sufficiently low magnetic (feebly magnetized or non-magnetic) and sufficient low MS temperature and a process for producing the member are provided. A composite magnetic member made of a single material of martensitic stainless steel including Ni having two sections of a ferromagnetic section having maximum permeability not less than 200 and coercive force not more than 2000 A/m and a feebly magnetized section having permeability not more than 2 and MS temperature not more than -30.degree. C.Type: GrantFiled: December 6, 1996Date of Patent: October 13, 1998Assignee: Hitachi Metals, Ltd. and Denso CorporationInventors: Tsutomu Inui, Jun Sunakawa, Masaki Shimizu, Keizo Takeuchi, Shinya Sugiura