Patents by Inventor Yoshio Bizen
Yoshio Bizen 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: 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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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: 20150050510Abstract: The invention provides an amorphous alloy ribbon consisting of Fe, Si, B, C, and unavoidable impurities, in which a content of Si is from 8.5 atom % to 9.5 atom %, and a content of B is from 10.0 atom % to less than 12.0 atom % when a total content of Fe, Si, and B is 100.0 atom %, a content of C relative to the total content of 100.0 atom % is from 0.2 atom % to 0.6 atom %, and the ribbon has a thickness of from 10 ?m to 40 ?m and a width of from 100 mm to 300 mm.Type: ApplicationFiled: March 7, 2013Publication date: February 19, 2015Applicant: HITACHI METALS, LTD.Inventors: Takayuki Motegi, Daichi Azuma, Hajime Itagaki, 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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Publication number: 20100231977Abstract: In CTP or CTF platemaking using the inkjet method, gap (discontinuity) or nonlinearity of tone is improved to realize superior gradation reproduction. A screening apparatus to which density information of an original picture is inputted, and which generates halftone dot data expressing tones corresponding to gradation of the original picture by using halftone dot patterns corresponding to inputted densities, and comprises a means for optimizing the combinations of halftone dots. The halftone dot patterns consist of combinations of one or more halftone dots of the same or different kinds selected from two or more kinds of halftone dots different in number of dots, and the means for optimizing optimizes the combinations of halftone dots so that relation of image area formed by an output device using the halftone dot patterns and the inputted density should constitute a desired function for at least a partial density range of the inputted density.Type: ApplicationFiled: August 8, 2007Publication date: September 16, 2010Applicant: KIMOTO CO., LTDInventors: Yoshio Bizen, Yuji Uchiyama
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Publication number: 20070221082Abstract: In the preparation of an offset printing plate comprising forming printing plate images with droplets of lipophilic ink by using a printing means based on the inkjet method, lipophilic ink having a UV curing property is used, and a UV lamp 7 is also carried on a carriage 8 carrying a printing head 6. While performing multipass printing by a dot thinning method for the main scanning direction and subscanning direction with the printing head 6, droplets on a printing plate material 2 immediately after the printing are cured with ultraviolet rays irradiated by the UV lamp 7. Moreover, ultraviolet rays are irradiated also in the period of returning of the carriage 8. Since blotting of the droplets immediately after printing do not overlap with one another, and the droplets are cured in every pass, extremely precise tone reproduction can be realized. Moreover, as the UV lamp 7, a UV lamp of a small output capacity can be used, and thus cost of the apparatus can be reduced.Type: ApplicationFiled: July 12, 2005Publication date: September 27, 2007Applicant: Kimoto Co.,Ltd.Inventors: Kenji Fukui, Hironori Sato, 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: 6451087Abstract: The method for producing a mother alloy for an iron-based amorphous alloy has the steps of (a) melting raw materials for elements constituting the amorphous alloy together with at least one oxide of an element constituting the amorphous alloy, the raw materials containing aluminum as an inevitable impurity, and the oxide having a smaller standard free energy of formation than that of Al2O3 in an absolute value; and (b) removing the resultant Al2O3 from the melt, thereby reducing the content of aluminum to 50 ppm or less in the melt.Type: GrantFiled: May 11, 2001Date of Patent: September 17, 2002Assignee: Hitachi Metals Ltd.Inventors: Yoshio Bizen, Setsuo Mishima, Takashi Meguro
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Patent number: 6425960Abstract: A soft magnetic alloy strip is manufactured by a single roll method. The soft magnetic alloy strip is 0.2×d mm or less (, which “d” is a width of the strip,) in warpage in the widthwise direction of the strip, and has a continuous, long length not less than 50 m, in which a width of an air pockets occurring on a roll contact face is not more than 35 &mgr;m, a length of the air pockets is not more than 150 &mgr;m, and the centerline average roughness Ra of the roll contact face is not more than 0.5 &mgr;m.Type: GrantFiled: April 14, 2000Date of Patent: July 30, 2002Assignee: Hitachi Metals, Ltd.Inventors: Yoshihito Yoshizawa, Yoshio Bizen, Shunsuke Arakawa, Michihiro Nagao, Takashi Meguro
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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: 20010054330Abstract: The method for producing a mother alloy for an iron-based amorphous alloy has the steps of (a) melting raw materials for elements constituting the amorphous alloy together with at least one oxide of an element constituting the amorphous alloy, the raw materials containing aluminum as an inevitable impurity, and the oxide having a smaller standard free energy of formation than that of Al2O3 in an absolute value; and (b) removing the resultant Al2O3 from the melt, thereby reducing the content of aluminum to 50 ppm or less in the melt.Type: ApplicationFiled: May 11, 2001Publication date: December 27, 2001Applicant: HITACHI METALS, LTDInventors: Yoshio Bizen, Setsuo Mishima, Takashi Meguro
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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: 5966064Abstract: A nanocrystalline alloy wherein at least 50 volume % of an alloy structure consists of a crystal grain mainly comprising bcc-phase having a grain size of 50 nm or less, a saturation magnetic flux density of the alloy is 1 T or more, a remanent flux density of the alloy is 0.4 T or less, and an Fe--B compound phase is partially formed in the alloy. The nanocrystalline alloy produced by heat treatment without applying any magnetic field shows pulse attenuation characteristics comparable to or more excellent than those of a nanocrystalline alloy obtained by heat treatment in a magnetic field.Type: GrantFiled: July 20, 1994Date of Patent: October 12, 1999Assignee: Hitachi Metals Ltd.Inventors: Yoshihito Yoshizawa, Yoshio Bizen, Shunsuke Arakawa