Patents by Inventor Takeshi Shibayama
Takeshi Shibayama 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: 11953664Abstract: A zoom optical system includes a positive first lens group, a negative second lens group disposed on an image side of the first lens group, a positive third lens group disposed on an image side of the second lens group, a negative fourth lens group disposed on an image side of the third lens group, and a final lens group disposed on an image side of the fourth lens group and closest to an image. During zooming, distances between lens groups change, and the first lens group moves along an optical axis. A negative focusing lens group is provided, and the final lens group is disposed on an image side of the focusing lens group. A negative vibration proof group of the second lens group may include, in order from an object, a negative lens, an air gap and a cemented lens of a negative lens and a positive lens. The final lens group may have negative refractive power.Type: GrantFiled: January 29, 2022Date of Patent: April 9, 2024Assignee: Nikon CorporationInventors: Takeshi Umeda, Tomoki Ito, Atsushi Shibayama
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Patent number: 11658596Abstract: A motor control device of an embodiment includes a power supply unit that supplies AC power to a motor; a current detection unit that detects a current flowing through a winding of the motor; a speed and electric angle estimation unit that estimates a rotation speed and an electric angle of the motor based on a voltage outputted by the power supply unit and the current; a coordinate conversion unit that obtains an excitation current and a torque current based on the current and the electric angle; a torque current command determination unit that substitutes a predicted torque calculated based on a mechanical motion equation into a torque component current command value calculated based on a torque expression of a vector control coordinate, to generate a torque component current command value for bringing a difference between an inputted speed command and an estimated speed closer to zero; and a model prediction control unit that applies, to a plurality of predicted currents including a current change ratio deType: GrantFiled: May 18, 2022Date of Patent: May 23, 2023Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA CARRIER CORPORATIONInventors: Takeshi Shibayama, Mariko Kuboi, Toshimitsu Aizawa, Naohito Kamiya, Yoshitaka Uchiyama
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Publication number: 20230045429Abstract: A motor control device of an embodiment includes a power supply unit that supplies AC power to a motor; a current detection unit that detects a current flowing through a winding of the motor; a speed and electric angle estimation unit that estimates a rotation speed and an electric angle of the motor based on a voltage outputted by the power supply unit and the current; a coordinate conversion unit that obtains an excitation current and a torque current based on the current and the electric angle; a torque current command determination unit that substitutes a predicted torque calculated based on a mechanical motion equation into a torque component current command value calculated based on a torque expression of a vector control coordinate, to generate a torque component current command value for bringing a difference between an inputted speed command and an estimated speed closer to zero; and a model prediction control unit that applies, to a plurality of predicted currents including a current change ratio deType: ApplicationFiled: May 18, 2022Publication date: February 9, 2023Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA CARRIER CORPORATIONInventors: Takeshi SHIBAYAMA, Mariko KUBOI, Toshimitsu AIZAWA, Naohito KAMIYA, Yoshitaka UCHIYAMA
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Patent number: 11410807Abstract: A ferrite composition includes main-phase particles, first sub-phase particles, second sub-phase particles, and a grain boundary. At least 10% or more of the main-phase particles contain a portion whose Zn concentrations monotonously decrease from a particle surface toward a particle central part along a length of 50 nm or more. The first sub-phase particles contain Zn2SiO4. The second sub-phase particles contain SiO2. A total area ratio of the first sub-phase particles and the second sub-phase particles is 30.5% or more.Type: GrantFiled: January 23, 2020Date of Patent: August 9, 2022Assignee: TDK CORPORATIONInventors: Takeshi Shibayama, Takashi Suzuki, Yukio Takahashi
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Patent number: 11373789Abstract: A ferrite sintered body of the invention includes; a main component including 48.65 to 49.45 mol % of iron oxide in terms of Fe2O3, 2 to 16 mol % of copper oxide in terms of CuO, 28.00 to 33.00 mol % of zinc oxide in terms of ZnO, and a balance including nickel oxide, and a subcomponent including boron oxide in an amount of 5 to 100 ppm in terms of B2O3 with respect to 100 parts by weight of the main component, in which the ferrite sintered body includes crystal grains having an average crystal grain size of 2 to 30 ?m.Type: GrantFiled: December 28, 2018Date of Patent: June 28, 2022Assignee: TDK CORPORATIONInventors: Takeshi Shibayama, Yukio Takahashi, Takashi Suzuki, Hiroyuki Tanoue, Masashi Shimoyasu, Masahiro Kato
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Patent number: 11282622Abstract: A ferrite composition includes a main component and a sub-component. The main component includes 10.0 to 38.0 mol % of a Fe compound in terms of Fe2O3, 3.0 to 11.0 mol % of a Cu compound in terms of CuO, 39.0 to 80.0 mol % (excluding 39.0 mol %) of a Zn compound in terms of ZnO, and a balance of a Ni compound. The sub-component includes 10.0 to 23.0 parts by weight of a Si compound in terms of SiO2, 0 to 3.0 parts by weight (including 0 parts by weight) of a Co compound in terms of Co3O4, and 0.1 to 3.0 parts by weight of a Bi compound in terms of Bi2O3 with respect to 100 parts by weight of the main component.Type: GrantFiled: December 26, 2019Date of Patent: March 22, 2022Assignee: TDK CORPORATIONInventors: Takeshi Shibayama, Takashi Suzuki, Takahiro Sato, Kenji Komorita, Tatsuro Suzuki, Yukio Takahashi, Hiroyuki Tanoue, Yasuhiro Ito
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Patent number: 10839995Abstract: A ferrite composition includes a main component that includes more than 44.0 mol % to 50.0 mol % or less of an Fe compound, 5.5 to 14.0 mol % of a Cu compound, 4.0 to 39.0 mol % of a Zn compound, and a balance of less than 40.0 mol % of a Ni compound. The ferrite composition further includes a subcomponent that includes, with respect to 100 parts by weight of the main component, more than 3.0 parts by weight to 13.0 parts by weight or less of an Si compound, more than 2.0 parts by weight to 10.0 parts by weight or less of a Co compound, and 0.25 to 5.00 parts by weight of a Bi compound. A weight ratio of the content of the Co compound to the content of the Si compound is 0.4 to 2.9.Type: GrantFiled: May 28, 2019Date of Patent: November 17, 2020Assignee: TDK CORPORATIONInventors: Takeshi Shibayama, Yukio Takahashi, Tatsuro Suzuki, Hiroyuki Tanoue, Yasuhiro Ito, Takahiro Sato, Takashi Suzuki
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Patent number: 10770210Abstract: A ferrite composition includes a main component and an accessory component. The main component includes 18 to 30 mol % of iron oxide in terms of Fe2O3, 4 to 14 mol % of copper oxide in terms of CuO, 0 to 6 mol % of zinc oxide in terms of ZnO, and a remaining part of nickel oxide. The accessory component includes 0.30 to 1.83 pts.wt. of silicon compound in terms of SiO2, 2.00 to 10.00 pts.wt. of cobalt compound in terms of Co3O4, and 1.00 to 3.00 pts.wt. of bismuth compound in terms of Bi2O3 with respect to 100 pts.wt. of the main component. A cobalt compound content in terms of Co3O4 divided by a silicon compound content in terms of SiO2 is a value of 5.5 to 30.0.Type: GrantFiled: September 19, 2017Date of Patent: September 8, 2020Assignee: TDK CORPORATIONInventors: Takeshi Shibayama, Asuka Murai, Yukio Takahashi, Takashi Suzuki, Hiroyuki Tanoue, Masaki Takahashi
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Publication number: 20200258668Abstract: A ferrite composition includes main-phase particles, first sub-phase particles, second sub-phase particles, and a grain boundary. At least 10% or more of the main-phase particles contain a portion whose Zn concentrations monotonously decrease from a particle surface toward a particle central part along a length of 50 nm or more. The first sub-phase particles contain Zn2SiO4. The second sub-phase particles contain SiO2. A total area ratio of the first sub-phase particles and the second sub-phase particles is 30.5% or more.Type: ApplicationFiled: January 23, 2020Publication date: August 13, 2020Applicant: TDK CORPORATIONInventors: Takeshi SHIBAYAMA, Takashi SUZUKI, Yukio TAKAHASHI
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Publication number: 20200243239Abstract: A ferrite composition includes a main component and a sub-component. The main component includes 10.0 to 38.0 mol % of a Fe compound in terms of Fe2O3, 3.0 to 11.0 mol % of a Cu compound in terms of CuO, 39.0 to 80.0 mol % (excluding 39.0 mol %) of a Zn compound in terms of ZnO, and a balance of a Ni compound. The sub-component includes 10.0 to 23.0 parts by weight of a Si compound in terms of SiO2, 0 to 3.0 parts by weight (including 0 parts by weight) of a Co compound in terms of Co3O4, and 0.1 to 3.0 parts by weight of a Bi compound in terms of Bi2O3 with respect to 100 parts by weight of the main component.Type: ApplicationFiled: December 26, 2019Publication date: July 30, 2020Applicant: TDK CORPORATIONInventors: Takeshi SHIBAYAMA, Takashi SUZUKI, Takahiro SATO, Kenji KOMORITA, Tatsuro SUZUKI, Yukio TAKAHASHI, Hiroyuki TANOUE, Yasuhiro ITO
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Publication number: 20190362872Abstract: A ferrite composition main component includes between 44.0 to 50.0 mol % of an Fe compound in terms of Fe2O3, between 5.5 to 14.0 mol % of a Cu compound in terms of CuO, between 4.0 to 39.0 mol % of a Zn compound in terms of ZnO, and a balance less than 40.0 mol % of a Ni compound in terms of NiO, The subcomponent includes, with respect to 100 parts by weight of the main component, between 3.0 parts to 13.0 parts by weight of an Si compound in terms of SiO2, between 2.0 to 10.0 parts by weight of a Co compound in terms of Co3O4, and between 0.25 to 5.00 parts by weight of a Bi compound in terms of Bi2O3. (The content of the Co compound in terms of Co3O4)/(the content of the Si compound in terms of SiO2) in weight ratio is 0.4 to 2.9.Type: ApplicationFiled: May 28, 2019Publication date: November 28, 2019Applicant: TDK CORPORATIONInventors: Takeshi SHIBAYAMA, Yukio TAKAHASHI, Tatsuro SUZUKI, Hiroyuki TANOUE, Yasuhiro ITO, Takahiro SATO, Takashi SUZUKI
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Publication number: 20190221344Abstract: A ferrite sintered body of the invention includes; a main component including 48.65 to 49.45 mol % of iron oxide in terms of Fe2O3, 2 to 16 mol % of copper oxide in terms of CuO, 28.00 to 33.00 mol % of zinc oxide in terms of ZnO, and a balance including nickel oxide, and a subcomponent including boron oxide in an amount of 5 to 100 ppm in terms of B2O3 with respect to 100 parts by weight of the main component, in which the ferrite sintered body includes crystal grains having an average crystal grain size of 2 to 30 ?m.Type: ApplicationFiled: December 28, 2018Publication date: July 18, 2019Applicant: TDK CORPORATIONInventors: Takeshi SHIBAYAMA, Yukio TAKAHASHI, Takashi SUZUKI, Hiroyuki TANOUE, Masashi SHIMOYASU, Masahiro KATO
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Patent number: 10074476Abstract: A ferrite composition composed of a main component including 26 to 46 mol % of an iron oxide in terms of Fe2O3, 4 to 14 mol % of a copper oxide in terms of CuO, 0 to 26 mol % of a zinc oxide in terms of ZnO, and a residue of 40.0 mol % or more of a nickel oxide in terms of NiO. The ferrite composition, with respect to 100 parts by weight of the main component, is also composed of a subcomponent including 0.8 to 10.0 parts by weight of a silicon compound in terms of SiO2, 1.0 to 15.0 parts by weight of a cobalt compound in terms of Co3O4, and 0.7 to 30.0 parts by weight of a bismuth compound in terms of Bi2O3. A value of the cobalt compound content in terms of Co3O4 divided by the silicon compound content in terms of SiO2 is 0.4 to 5.5.Type: GrantFiled: April 4, 2016Date of Patent: September 11, 2018Assignee: TDK CORPORATIONInventors: Hiroki Choto, Takeshi Shibayama, Ryuichi Wada, Kouichi Kakuda, Yukari Akita, Asuka Murai, Yukio Takahashi, Takashi Suzuki, Akinori Ohi
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Publication number: 20180096768Abstract: A ferrite composition includes a main component and an accessory component. The main component includes 18 to 30 mol % of iron oxide in terms of Fe2O3, 4 to 14 mol % of copper oxide in terms of CuO, 0 to 6 mol % of zinc oxide in terms of ZnO, and a remaining part of nickel oxide. The accessory component includes 0.30 to 1.83 pts.wt. of silicon compound in terms of SiO2, 2.00 to 10.00 pts.wt. of cobalt compound in terms of Co3O4, and 1.00 to 3.00 pts.wt. of bismuth compound in terms of Bi2O3 with respect to 100 pts.wt. of the main component. A cobalt compound content in terms of Co3O4 divided by a silicon compound content in terms of SiO2 is a value of 5.5 to 30.0.Type: ApplicationFiled: September 19, 2017Publication date: April 5, 2018Applicant: TDK CORPORATIONInventors: Takeshi SHIBAYAMA, Asuka MURAI, Yukio TAKAHASHI, Takashi SUZUKI, Hiroyuki TANOUE, Masaki TAKAHASHI
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Patent number: 9824804Abstract: Provided is a composite ferrite composition including a magnetic substance material and a nonmagnetic substance material. The magnetic substance material is Ni—Cu—Zn based ferrite. The nonmagnetic substance material comprises a low dielectric constant nonmagnetic substance material, which is shown by a general formula: a(bZnO.cCuO).SiO2 and satisfies a=1.5 to 2.4, b=0.85 to 0.98, c=0.02 to 0.15, and b+c=1.00 in said general formula, and a bismuth oxide. A mixing ratio of the magnetic substance material and the low dielectric constant nonmagnetic substance material is 80 wt %:20 wt % to 10 wt %:90 wt %.Type: GrantFiled: April 4, 2016Date of Patent: November 21, 2017Assignee: TDK CORPORATIONInventors: Hiroki Choto, Takeshi Shibayama, Takashi Suzuki, Shinichi Kondo, Yuya Oshima, Masaki Takahashi
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Patent number: 9795020Abstract: An ESD (ElectroStatic Discharge) protection component has: first and second discharge electrodes arranged so as to be opposed to each other through a gap; and a discharge inducing portion kept in contact with the first and second discharge electrodes and configured to connect the first and second discharge electrodes to each other. The discharge inducing portion has metal particles, a ceramic material containing glass, and a dielectric material having a dielectric constant higher than that of the ceramic material. A content of the dielectric material is in the range of 7.5 to 40% by volume, with respect to a total volume of the ceramic material and the dielectric material.Type: GrantFiled: December 12, 2014Date of Patent: October 17, 2017Assignee: TDK CORPORATIONInventors: Takeshi Shibayama, Hidenobu Umeda
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Publication number: 20160300651Abstract: A ferrite composition composed of a main component including 26 to 46 mol % of an iron oxide in terms of Fe2O3, 4 to 14 mol % of a copper oxide in terms of CuO, 0 to 26 mol % of a zinc oxide in terms of ZnO, and a residue of 40.0 mol % or more of a nickel oxide in terms of NiO. The ferrite composition, with respect to 100 parts by weight of the main component, is also composed of a subcomponent including 0.8 to 10.0 parts by weight of a silicon compound in terms of SiO2, 1.0 to 15.0 parts by weight of a cobalt compound in terms of Co3O4, and 0.7 to 30.0 parts by weight of a bismuth compound in terms of Bi2O3. A value of the cobalt compound content in terms of Co3O4 divided by the silicon compound content in terms of SiO2 is 0.4 to 5.5.Type: ApplicationFiled: April 4, 2016Publication date: October 13, 2016Applicant: TDK CORPORATIONInventors: Hiroki CHOTO, Takeshi SHIBAYAMA, Ryuichi WADA, Kouichi KAKUDA, Yukari AKITA, Asuka MURAI, Yukio TAKAHASHI, Takashi SUZUKI, Akinori OHI
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Publication number: 20160293301Abstract: Provided is a composite ferrite composition including a magnetic substance material and a nonmagnetic substance material. The magnetic substance material is Ni—Cu—Zn based ferrite. The nonmagnetic substance material comprises a low dielectric constant nonmagnetic substance material, which is shown by a general formula: a(bZnO.cCuO).SiO2 and satisfies a=1.5 to 2.4, b=0.85 to 0.98, c=0.02 to 0.15, and b+c=1.00 in said general formula, and a bismuth oxide. A mixing ratio of the magnetic substance material and the low dielectric constant nonmagnetic substance material is 80 wt %:20 wt % to 10 wt %:90 wt %.Type: ApplicationFiled: April 4, 2016Publication date: October 6, 2016Applicant: TDK CORPORATIONInventors: Hiroki CHOTO, Takeshi SHIBAYAMA, Takashi SUZUKI, Shinichi KONDO, Yuya OSHIMA, Masaki TAKAHASHI
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Patent number: 9185785Abstract: An electrostatic protection component includes: a body in which a plurality of ceramic substrates is laminated; and a pair of discharge electrodes which are formed within the body and which are spaced to face each other. The discharge electrodes include main body portions extending along a longitudinal direction, and the main body portions include tips in the longitudinal direction and side edges extending along the longitudinal direction. The pair of discharge electrodes are arranged such that both the main body portions are adjacent to each other in a short direction. The discharge electrodes face each other in the short direction between the side edges, and discharge occurs only between the side edges, between the discharge electrodes.Type: GrantFiled: March 24, 2014Date of Patent: November 10, 2015Assignee: TDK CORPORATIONInventors: Hidenobu Umeda, Makoto Yoshino, Takahiro Sato, Takuo Hattori, Shinichi Sato, Takeshi Shibayama
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Publication number: 20150189727Abstract: An ESD (ElectroStatic Discharge) protection component has: first and second discharge electrodes arranged so as to be opposed to each other through a gap; and a discharge inducing portion kept in contact with the first and second discharge electrodes and configured to connect the first and second discharge electrodes to each other. The discharge inducing portion has metal particles, a ceramic material containing glass, and a dielectric material having a dielectric constant higher than that of the ceramic material. A content of the dielectric material is in the range of 7.5 to 40% by volume, with respect to a total volume of the ceramic material and the dielectric material.Type: ApplicationFiled: December 12, 2014Publication date: July 2, 2015Inventors: Takeshi SHIBAYAMA, Hidenobu UMEDA