Patents by Inventor Takuya Aoki
Takuya Aoki 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: 20070181847Abstract: It is an object to provide a ferrite material which has a higher saturation magnetic flux density and low core loss, both at 100° C. The ferrite material is composed of a sintered body containing Fe, Mn and Zn as main constituents at x, y and z % by mol in terms of Fe2O3, MnO and ZnO, respectively, and containing Li as an additive at v % by weight in terms of Li2CO3 based on the main constituents, wherein x=55.7 to 60, z=3 to 8.5, y=100?x?z, v=0.3 to 0.8, and x1?x?x2 (x1=52.9?0.1z+8.5v and x2=54.4?0.1z+8.5v).Type: ApplicationFiled: February 6, 2007Publication date: August 9, 2007Applicant: TDK CORPORATIONInventors: Tomofumi Kuroda, Isao Nakahata, Masahiko Watanabe, Masahito Furukawa, Osamu Hasegawa, Takuya Aoki
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Patent number: 7238298Abstract: An Ni—Cu—Zn-based ferrite material contains TiO2 alone as an additive in an amount of 0.1 wt %<x?4.0 wt % in which x denotes a content of the TiO2 and unavoidable impurities. The principal components thereof are 43.0 to 49.8 mol % of Fe2O3, 4.0 to 13.0 mol % of CuO, 5 to 35 mol % of ZnO and the balance of NiO.Type: GrantFiled: October 6, 2004Date of Patent: July 3, 2007Assignee: TDK CorporationInventors: Takuya Aoki, Taku Murase
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Publication number: 20070138431Abstract: An NiCuZn-base ferrite of the invention comprises as main components an iron oxide in an amount of 45.0 to 49.0 mol % on Fe2O3 basis, an copper oxide in an amount of 5.0 to 14.0 mol % on CuO basis and a zinc oxide in an amount of 1.0 to 32.0 mol % on ZnO basis with a nickel oxide accounting for the rest mol % on NiO basis. With respect to the main components, a bismuth oxide is contained in an amount of 0.25 exclusive to 0.40% by weight on Bi2O3 basis, and a tin oxide is contained in an amount of 1.00 to 2.50% by weight on SnO2 basis. The invention ensures a leap upward in direct-current bias characteristics.Type: ApplicationFiled: August 30, 2006Publication date: June 21, 2007Applicant: TDK CORPORATIONInventors: Ryuichi Wada, Takuya Aoki, Hiroshi Momoi, Yukio Takahashi, Takahiro Satoh
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Publication number: 20060116283Abstract: A ferrite material of the present invention is configured such that 0.05 to 1.0 wt % of bismuth oxide in terms of Bi2O3, 0.5 to 3.0 wt % of tin oxide in terms of SnO2, and 30 to 5000 wt ppm of chromium oxide in terms of Cr2O3 are added to a predetermined main component mixture composition. Therefore, it is possible to achieve an improvement in DC bias characteristics, an improvement in temperature characteristics of initial magnetic permeability, and an improvement in resistivity and further achieve an improvement in burned body strength, particularly in burned body flexural strength (bending strength).Type: ApplicationFiled: October 26, 2005Publication date: June 1, 2006Applicant: TDK CorporationInventors: Ryuichi Wada, Takuya Aoki, Atsuhito Matsukawa, Kensaku Asakura
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Patent number: 7034649Abstract: A ferrite material having a high Q value and also having a small absolute value of ??ir in a wide temperature range between ?40° C. and 160° C. A ferrite material, which comprises, as main constituents, 45.5 to 48 mol % of Fe2O3, 5 to 10.5 mol % of CuO, 26 to 30 mol % of ZnO, and the balance substantially being NiO, and further comprises, as an additive, cobalt oxide within a range between 0.005 and 0.045 wt % in terms of CoO. The ferrite material of the present invention has properties such as each of the absolute value of ??ir?40˜20 and the absolute value of ??ir20˜160 of 3 ppm/° C. or less, and a Q value at 125 kHz of 170 or more.Type: GrantFiled: August 31, 2004Date of Patent: April 25, 2006Assignee: TDK CorporationInventors: Kensaku Asakura, Takuya Aoki, Taku Murase
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Publication number: 20050258393Abstract: The temperature properties of the initial permeability of a Ni—Cu—Zn based ferrite material are improved while the degradation of the magnetic properties of the ferrite material is being suppressed. The ferrite material is formed of a sintered body comprising, as main constituents, Fe2O3: 47.0 to 50.0 mol %, CuO: 0 to 7 mol %, NiO: 13 to 26 mol %, and ZnO substantially constituting the balance, wherein the sintered body comprises 40 ppm or less of P in terms of P2O5 and 50 to 1800 ppm of one or more additives of Al2O3, CaO and MgO in relation to the sum of the contents of the main constituents. In the Ni—Cu—Zn based ferrite material, the mean grain size can be set at 12 ?m or less and the standard deviation of the grain size can be set at 4.5 ?m or less.Type: ApplicationFiled: May 19, 2005Publication date: November 24, 2005Inventors: Shin Takane, Takuya Aoki
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Publication number: 20050238904Abstract: There is provided a Mn—Zn based ferrite member excellent in mass productivity, high in withstand voltage, low in loss and excellent in direct current superposition property. The Mn—Zn based ferrite member is provided with a surface layer portion having the properties that ?5 defined in the specification satisfies the relation that ?5?103 ?m and ?50 defined in the specification satisfies the relation that ?50?102 ?m.Type: ApplicationFiled: April 21, 2005Publication date: October 27, 2005Inventors: Takashi Kajino, Kenya Takagawa, Taku Murase, Takuya Aoki
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Publication number: 20050199851Abstract: An Ni—Cu—Zn-based ferrite material contains TiO2 alone as an additive in an amount of 0.1 wt %<x?4.0 wt % in which x denotes a content of the TiO2 and unavoidable impurities. The principal components thereof are 43.0 to 49.8 mol % of Fe2O3, 4.0 to 13.0 mol % of CuO, 5 to 35 mol % of ZnO and the balance of NiO.Type: ApplicationFiled: October 6, 2004Publication date: September 15, 2005Applicant: TDK CORPORATIONInventors: Takuya Aoki, Taku Murase
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Publication number: 20050062576Abstract: A ferrite material having a high Q value and also having a small absolute value of ??ir in a wide temperature range between ?40° C. and 160° C. A ferrite material, which comprises, as main constituents, 45.5 to 48 mol % of Fe2O3, 5 to 10.5 mol % of CuO, 26 to 30 mol % of ZnO, and the balance substantially being NiO, and further comprises, as an additive, cobalt oxide within a range between 0.005 and 0.045 wt % in terms of CoO. The ferrite material of the present invention has properties such as each of the absolute value of ??ir?40˜20 and the absolute value of ??ir20˜160 of 3 ppm/° C. or less, and a Q value at 125 kHz of 170 or more.Type: ApplicationFiled: August 31, 2004Publication date: March 24, 2005Inventors: Kensaku Asakura, Takuya Aoki, Taku Murase
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Patent number: 6790379Abstract: A magnetic ferrite composition including at least one of Mg, Ni, Cu, Zn, Mn, and Li and having a content of carbon within a predetermined range, for example, over 9.7 weight ppm to less than 96 weight ppm. The composition may be used as the magnetic core for an inductor, transformer, coil, etc. used for radios, televisions, communication devices, office automation equipment, switching power sources, and other electronic apparatuses or magnetic heads for video apparatuses or magnetic disk drives or other electronic components.Type: GrantFiled: September 12, 2003Date of Patent: September 14, 2004Assignee: TDK CorporationInventors: Takuya Aoki, Takeshi Nomura
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Patent number: 6736990Abstract: There can be provided an NiCuZn-based ferrite material containing an iron oxide, a copper oxide, zinc oxide and a nickel oxide in predetermined amounts as main components and a bismuth oxide, a silicon oxide, magnesium oxide and a cobalt oxide in predetermined amounts as additional components. Due to the predetermined amounts of the additional components, the ferrite material has an extremely good temperature characteristic (a change in permeability along with a change in temperature is small), a high quality coefficient Q and high strength.Type: GrantFiled: March 7, 2002Date of Patent: May 18, 2004Assignee: TDK CorporationInventors: Takuya Aoki, Ko Ito, Bungo Sakurai, Yukio Takahashi, Tatsuya Shimazaki, Hidenobu Umeda, Akinori Ohi
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Publication number: 20040051075Abstract: A magnetic ferrite composition including at least one of Mg, Ni, Cu, Zn, Mn, and Li and having a content of carbon within a predetermined range, for example, over 9.7 weight ppm to less than 96 weight ppm. The composition may be used as the magnetic core for an inductor, transformer, coil, etc. used for radios, televisions, communication devices, office automation equipment, switching power sources, and other electronic apparatuses or magnetic heads for video apparatuses or magnetic disk drives or other electronic components.Type: ApplicationFiled: September 12, 2003Publication date: March 18, 2004Applicant: TDK CorporationInventors: Takuya Aoki, Takeshi Nomura
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Patent number: 6652768Abstract: A magnetic ferrite composition including at least one of Mg, Ni, Cu, Zn, Mn, and Li and having a content of carbon within a predetermined range, for example, over 9.7 weight ppm to less than 96 weight ppm. The composition may be used as the magnetic core for an inductor, transformer, coil, etc. used for radios, televisions, communication devices, office automation equipment, switching power sources, and other electronic apparatuses or magnetic heads for video apparatuses or magnetic disk drives or other electronic components.Type: GrantFiled: October 10, 2002Date of Patent: November 25, 2003Assignee: TDK CorporationInventors: Takuya Aoki, Takeshi Nomura
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Publication number: 20030038273Abstract: A magnetic ferrite composition including at least one of Mg, Ni, Cu, Zn, Mn, and Li and having a content of carbon within a predetermined range, for example, over 9.7 weight ppm to less than 96 weight ppm. The composition may be used as the magnetic core for an inductor, transformer, coil, etc. used for radios, televisions, communication devices, office automation equipment, switching power sources, and other electronic apparatuses or magnetic heads for video apparatuses or magnetic disk drives or other electronic components.Type: ApplicationFiled: October 10, 2002Publication date: February 27, 2003Applicant: TDK CorporationInventors: Takuya Aoki, Takeshi Nomura
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Patent number: 6495059Abstract: A magnetic ferrite composition including at least one of Mg, Ni, Cu, Zn, Mn, and Li and having a content of carbon within a predetermined range, for example, over 9.7 weight ppm to less than 96 weight ppm. The composition may be used as the magnetic core for an inductor, transformer, coil, etc. used for radios, televisions, communication devices, office automation equipment, switching power sources, and other electronic apparatuses or magnetic heads for video apparatuses or magnetic disk drives or other electronic components.Type: GrantFiled: September 13, 2000Date of Patent: December 17, 2002Assignee: TDK CorporationInventors: Takuya Aoki, Takeshi Nomura
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Publication number: 20020175311Abstract: There can be provided an NiCuZn-based ferrite material containing an iron oxide, a copper oxide, zinc oxide and a nickel oxide in predetermined amounts as main components and a bismuth oxide, a silicon oxide, magnesium oxide and a cobalt oxide in predetermined amounts as additional components. Due to the predetermined amounts of the additional components, the ferrite material has an extremely good temperature characteristic (a change in permeability along with a change in temperature is small), a high quality coefficient Q and high strength.Type: ApplicationFiled: March 7, 2002Publication date: November 28, 2002Inventors: Takuya Aoki, Ko Ito, Bungo Sakurai, Yukio Takahashi, Tatsuya Shimazaki, Hidenoru Umeda, Akinori Ohi
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Patent number: 6200493Abstract: There is disclosed an MnMgCuZn ferrite material which contains ranges of 46.5 to 50.4 mol % of iron oxide, 10.5 to 22.0 mol % of magnesium oxide, 22.5 to 25.0 mol % of zinc oxide, 6.0 to 16.0 mol % of copper oxide, and 0.1 to 3.5 mol % of manganese oxide. Advantages of an MnMgCuZn ferrite material that resistivity is relatively high and material cost is low are utilized to realize a superior MnMgCuZn ferrite material which is much smaller in magnetic loss than conventional materials of the same series and which has a sufficient saturated magnetic flux density.Type: GrantFiled: March 18, 1999Date of Patent: March 13, 2001Assignee: TDK CorporationInventors: Taku Murase, Takuya Aoki, Naoyoshi Sato, Isao Kanada
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Patent number: 6113843Abstract: The process for the preparation of an oxide magnetic compact of the invention comprises:a step of preparing a mixed material which comprises 44 to 50 mole % of iron calculated as Fe.sub.2 O.sub.3, 0.1 to 8 mole % of manganese calculated as Mn.sub.2 O.sub.3, with the sum of iron and manganese being 50 to 54 mole % calculated as Fe.sub.2 O.sub.3 and Mn.sub.2 O.sub.3, 20 to 38 mole % of magnesium calculated as MgO, 17 to 22 mole % of zinc calculated as ZnO and not more than 5 mole % of copper calculated as CuO, anda step of molding the aforesaid mixed material to a predetermined shape and then firing it in an atmosphere of low oxygen concentration of 2.5 to 12% by volume. Therefore, there appears an extremely excellent effect that the oxide magnetic compact having excellent electromagnetic properties can be obtained at low cost.Type: GrantFiled: March 23, 1999Date of Patent: September 5, 2000Assignee: TDK CorporationInventors: Takuya Aoki, Taku Murase, Kazuhiro Takakura, Jun Sawai, Naoyoshi Sato
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Patent number: 6031213Abstract: An electrode structure includes: a metallic electrode; a case for accommodating and holding the electrode, and one end of a lead wire connecting to the electrode; and an insulating member interposed between the electrode and the case in order to ensure insulation between the electrode and the case, in which structure a waterproof member is interposed between the case and the lead wire in order to prevent the incoming of water from between the case and the lead wire, and an electric heater havinging the above electrode structure.Type: GrantFiled: December 5, 1995Date of Patent: February 29, 2000Assignees: NGK Insulators, Ltd., Honda Giken Kogyo Kabushiki KaishaInventors: Shigeharu Hashimoto, Tadato Ito, Yuichi Shimasaki, Hiroaki Kato, Takashi Komatsuda, Akihisa Saito, Takuya Aoki, Tetsu Teshirogi
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Patent number: 6028353Abstract: The present invention relates to a laminated chip bead element demonstrating noise absorption characteristics over a broad range in a high frequency range of GHz or higher. An insulating body is constituted of a material achieved by mixing ferrite powder and an insulating resin. At least one signal conductor is embedded in the insulating body. It is desirable that the insulating body includes a plurality of composite members.Type: GrantFiled: August 11, 1998Date of Patent: February 22, 2000Assignee: TDK CorporationInventors: Atsuyuki Nakano, Akinori Oi, Takuya Aoki, Minoru Takaya