Patents by Inventor Hirotaka Oshima
Hirotaka Oshima 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: 20150145500Abstract: An A.C. power measuring apparatus includes a voltage detecting unit that detects voltage waveforms of each of phases of a set of insulated cables for supplying a three-phase A.C. power to a load, by performing a contactless measurement by electrostatic capacitance coupling, and a current detecting unit that detects current waveforms of the set of insulated tables, by performing a contactless measurement by electromagnetic induction coupling. The apparatus further includes a processing unit that computes a power to be supplied to the load, based on line-to-line voltage waveforms, the current waveforms, and prescribed voltage values, by normalizing the voltage waveforms of each of the phases so that as amplitude ratio of the voltage waveforms becomes in accordance with a grounding type of the three-phase A.C. power, and obtaining the line-to-line voltages of the set of three insulated cables based on the normalized voltage waveforms of each of the phases.Type: ApplicationFiled: February 3, 2015Publication date: May 28, 2015Applicant: FUJITSU LIMITEDInventors: Hirotaka Oshima, Akio ITO
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Patent number: 8560263Abstract: A device that estimates a positional relationship between loads individually connected through sensors to electric power-supply ends provided in a power distribution network includes a communication unit configured to change a resistance value located between each of electric power-supply ends and a ground terminal of each of sensors and measure a voltage value produced between each of the electric power-supply ends and the ground terminal; and a determination unit configured to acquire voltage values from the two selected sensors from among the sensors after a resistance value of one of the two sensors that has a higher acquired voltage value is changed, calculate a ratio between voltage values acquired before and after the resistance value is changed, and determine that the two sensors are connected to a branch circuit in a same system in the power distribution network, when each ratio about the two sensors is within a specified range.Type: GrantFiled: February 17, 2011Date of Patent: October 15, 2013Assignee: Fujitsu LimitedInventors: Hiroshi Yamamoto, Toshiaki Funakubo, Nobutsugu Fujino, Hirotaka Oshima
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Patent number: 8433453Abstract: An electric power leveling controller includes an information acquisition unit that acquires information of electric energy consumption from a power consuming device consuming electric energy from the power source and electric energy charged into a power storage device, a storage unit that stores a specific threshold value for each power storage device, and a control unit that causes a first power consuming device to be power-supplied by the power source, causing the power storage device corresponding to the first power consuming device to be charged with a difference between the specific threshold value and the electric energy consumption, causing the power source to supply to a second power consuming device electric energy corresponding to the specific threshold, and causing the power storage device corresponding to the second power consuming device to discharge to the second power consuming device the difference between the electric energy consumption and the specific threshold value.Type: GrantFiled: March 1, 2011Date of Patent: April 30, 2013Assignee: Fujitsu LimitedInventors: Tadanobu Tsunoda, Kazumasa Ushiki, Hirotaka Oshima, Hiroshi Yamamoto, Toshiaki Funakubo, Nobutsugu Fujino
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Publication number: 20130073270Abstract: A computer-readable medium stores a magnetic substrate simulation program causing a computer to execute a process that includes calculating an effective magnetic field for each area of an element in the magnetic substrate, when magnetization of each area changes and based on a magnetic field generated from magnetic energy in each area and a rate of change of magnetization working in a direction inhibiting change in the average magnetization of the areas; obtaining for each area and based on the calculated effective magnetic fields and magnetization of each area, changes in magnetization and calculating for each area, magnetization after the changes; judging based on magnetization of each area before and after the changes, whether magnetization in the element converges; and storing a combination of the average magnetization of the areas for which magnetization in the given element converges and a static magnetic field based on the average magnetization.Type: ApplicationFiled: July 26, 2012Publication date: March 21, 2013Applicant: FUJITSU LIMITEDInventors: Atsushi Furuya, Yuji Uehara, Hirotaka Oshima
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Publication number: 20120259565Abstract: An alternating current power measuring apparatus includes a first capacitance element having one end connected to a conductor wire of a first electrical cable of a set of electrical cables for supplying alternating current to a load and having the other end capacitively coupled to a conductor wire of a second electrical cable, a first voltage measuring part which measures a first voltage which is a voltage of both ends of the first capacitance element, a first current measuring part which measures a first current flowing in the first electrical cable, and a processing part which computes a power to be supplied to the load by the set of electrical cables by the multiplication among a proportion between a specified voltage value of a voltage applied to the set of electrical cables and an effective value of the first voltage, the first voltage and the first current.Type: ApplicationFiled: February 27, 2012Publication date: October 11, 2012Applicant: FUJITSU LIMITEDInventors: Hirotaka OSHIMA, Takayuki Ambe, Akio Ito
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Publication number: 20110218693Abstract: An electric power leveling controller includes an information acquisition unit that acquires information of electric energy consumption from a power consuming device consuming electric energy from the power source and electric energy charged into a power storage device, a storage unit that stores a specific threshold value for each power storage device, and a control unit that causes a first power consuming device to be power-supplied by the power source, causing the power storage device corresponding to the first power consuming device to be charged with a difference between the specific threshold value and the electric energy consumption, causing the power source to supply to a second power consuming device electric energy corresponding to the specific threshold, and causing the power storage device corresponding to the second power consuming device to discharge to the second power consuming device the difference between the electric energy consumption and the specific threshold value.Type: ApplicationFiled: March 1, 2011Publication date: September 8, 2011Applicant: FUJITSU LIMITEDInventors: Tadanobu TSUNODA, Kazumasa USHIKI, Hirotaka OSHIMA, Hiroshi YAMAMOTO, Toshiaki FUNAKUBO, Nobutsugu FUJINO
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Publication number: 20110208468Abstract: A device that estimates a positional relationship between loads individually connected through sensors to electric power-supply ends provided in a power distribution network includes a communication unit configured to change a resistance value located between each of electric power-supply ends and a ground terminal of each of sensors and measure a voltage value produced between each of the electric power-supply ends and the ground terminal; and a determination unit configured to acquire voltage values from the two selected sensors from among the sensors after a resistance value of one of the two sensors that has a higher acquired voltage value is changed, calculate a ratio between voltage values acquired before and after the resistance value is changed, and determine that the two sensors are connected to a branch circuit in a same system in the power distribution network, when each ratio about the two sensors is within a specified range.Type: ApplicationFiled: February 17, 2011Publication date: August 25, 2011Applicant: FUJITSU LIMITEDInventors: Hiroshi YAMAMOTO, Toshiaki Funakubo, Nobutsugu Fujino, Hirotaka Oshima
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Publication number: 20090147405Abstract: A method for manufacturing a magnetic recording medium which has a substrate and a magnetic layer formed on the substrate, the method including: forming the magnetic layer over a convexo-concave pattern provided on a surface of a mold, and releasing the mold from the magnetic layer formed on the substrate.Type: ApplicationFiled: December 2, 2008Publication date: June 11, 2009Applicants: FUJITSU LIMITED, KANAGAWA ACADEMY OF SCIENCE AND TECHNOLOGYInventors: Hirotaka Oshima, Hideyuki Kikuchi, Takeshi Morikawa, Hiroshi Nakao, Ken-ichi Itoh, Hideki Masuda, Kazuyuki Nishio
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Patent number: 7486487Abstract: A magneto-resistive element employs a CPP structure and includes an antiferromagnetic layer, a pinned magnetization layer, a nonmagnetic intermediate layer and a free magnetization layer that are successively stacked. The pinned magnetization layer includes a first pinned magnetization layer, a nonmagnetic coupling layer and a second pinned magnetization layer that are successively stacked on the antiferromagnetic layer, and the first and second pinned magnetization layers are antiferromagnetically exchange-coupled. One of the first and second pinned magnetization layer is formed by a ferromagnetic layer made of a ferromagnetic material at least including one element or alloy selected from a group consisting of Co, Fe, Ni and alloys thereof, and the other is formed by a resistance control layer made of a conductive ferromagnetic oxide.Type: GrantFiled: May 25, 2005Date of Patent: February 3, 2009Assignee: Fujitsu LimitedInventors: Hirotaka Oshima, Reiko Kondo, Arata Jogo, Yutaka Shimizu, Atsushi Tanaka
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Patent number: 7450351Abstract: A magnetoresistive element of a CPP type configuration including a fixed magnetic layer, a first non-magnetic layer, a free magnetic layer, and a second non-magnetic layer is disclosed. The magnetoresistive element includes a first interface layer situated between the free magnetic layer and the first non-magnetic layer, and a second interface layer situated between the free magnetic layer and the second non-magnetic layer. The first interface layer and the second interface layer include a material mainly having CoNiFe.Type: GrantFiled: June 20, 2005Date of Patent: November 11, 2008Assignee: Fujitsu LimitedInventors: Hirotaka Oshima, Keiichi Nagasaka, Arata Jogo, Yutaka Shimizu, Atsushi Tanaka
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Patent number: 7428127Abstract: A CPP magnetoresistive effect element includes a free magnetization layer, a fixed magnetization layer, and a plurality of conductive non-magnetic intermediate layers formed between the free magnetization layer and the fixed magnetization layer. An insulating layer and a magnetic layer including magnetic atoms are provided between any two of the non-magnetic intermediate layers.Type: GrantFiled: January 25, 2005Date of Patent: September 23, 2008Assignee: Fujitsu LimitedInventors: Keiichi Nagasaka, Yoshihiko Seyama, Hirotaka Oshima, Yutaka Shimizu, Atsushi Tanaka
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Patent number: 7428130Abstract: A CPP-type magnetoresistive element including a fixed magnetization layer, a non-magnetic metal layer, and a free magnetization layer that are stacked, and a diffusion prevention layer is disclosed. The free magnetization layer includes CoMnAl. The diffusion prevention layer is provided between the non-magnetic metal layer and the free magnetization layer so as to prevent Mn included in the free magnetization layer from diffusing into the non-magnetic metal layer. CoMnAl has a composition within the area formed by connecting Point A (44, 23, 33), Point B (48, 25, 27), Point C (60, 20, 20), Point D (65, 15, 20), Point E (65, 10, 25), Point F (60, 10, 30), and Point A with straight lines in this order in a ternary composition diagram where coordinates of the composition are expressed as (Co content, Mn content, Al content) with each of the Co, Mn, and Al contents being expressed in atomic percentage.Type: GrantFiled: April 25, 2006Date of Patent: September 23, 2008Assignee: Fujitsu LimitedInventors: Arata Jogo, Hirotaka Oshima, Takahiro Ibusuki, Yutaka Shimizu, Takuya Uzumaki
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Publication number: 20080220290Abstract: To provide a magnetic recording medium manufacturing method capable of transferring a pattern that can serve as a source for forming anodized alumina-nanoholes with high precision and realizing high productivity, and a large-capacity magnetic recording medium capable of achieving high density recording. The method includes forming a metallic layer on a concavo-convex pattern formed on a surface of a mold; bonding a substrate using an adhesive to a surface of the metallic layer on the side opposite to the mold; separating the mold from the metallic layer; forming, through nanohole formation treatment, a porous layer in which a plurality of nanoholes are formed to orient in a direction substantially perpendicular to a substrate plane by using as a nanohole source a concavo-convex pattern which has been formed by transferring the concavo-convex pattern in the mold to the metallic layer; and charging a magnetic material inside the nanoholes.Type: ApplicationFiled: December 28, 2007Publication date: September 11, 2008Applicants: Fujitsu Limited, Kanagawa Academy of Science and TechnologyInventors: Ken-ichi Itoh, Hideyuki Kikuchi, Hiroshi Nakao, Hirotaka Oshima, Takahiro Umada, Hideki Masuda, Kazuyuki Nishio, Mitsuo Takeuchi, Hiroaki Date
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Patent number: 7355825Abstract: A magnetoresistive film is interposed between domain controlling films in a current-perpendicular-to-the-plane (CPP) structure magnetoresistive element. The domain controlling films are designed to establish a first biasing magnetic field of a first intensity across the magnetoresistive film along the front end of the magnetoresistive film and a second biasing magnetic field of a second intensity larger than the first intensity along the rear end of the magnetoresistive film. The second biasing magnetic field serves to establish a single domain property within the magnetoresistive film along the rear end. Although the first biasing magnetic field acts in the same direction as the current field at a position near the front end of the magnetoresistive film, the magnetization is allowed to reliably rotate near the front end. A sensing current having a larger current value can be supplied to the magnetoresistive film. The magnetoresistive film exhibits a sufficient sensitivity.Type: GrantFiled: March 4, 2005Date of Patent: April 8, 2008Assignee: Fujitsu LimitedInventor: Hirotaka Oshima
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Patent number: 7312957Abstract: A current-perpendicular-to-the-plane (CPP) structure magnetoresistive element includes an electrode layer contacting a magnetoresistive film. A low resistance region is defined to extend rearward along the boundary of the magnetoresistive film from the front end exposed at the medium-opposed surface of the head slider. A high resistance region is defined to extend rearward along the boundary from the rear end of the low resistance region. The high resistance region has a resistivity higher than that of the low resistance region. The high resistance region serves to restrict the path of a sensing current nearest to the medium-opposed surface. The sensing current is allowed to concentrate at a position closest to the medium-opposed surface in the magnetoresistive film. Magnetization sufficiently rotates in the magnetoresistive film near the medium-opposed surface. The CPP structure magnetoresistive element maintains a sufficient variation in the resistance. A sufficient sensitivity can be maintained.Type: GrantFiled: September 14, 2004Date of Patent: December 25, 2007Assignee: Fujitsu LimitedInventors: Hirotaka Oshima, Yutaka Shimizu, Atsushi Tanaka
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Publication number: 20070268632Abstract: A CPP-type magnetoresistive element including a fixed magnetization layer, a non-magnetic metal layer, and a free magnetization layer that are stacked, and a diffusion prevention layer is disclosed. The free magnetization layer includes CoMnAl. The diffusion prevention layer is provided between the non-magnetic metal layer and the free magnetization layer so as to prevent Mn included in the free magnetization layer from diffusing into the non-magnetic metal layer. CoMnAl has a composition within the area formed by connecting Point A (44, 23, 33), Point B (48, 25, 27), Point C (60, 20, 20), Point D (65, 15, 20), Point E (65, 10, 25), Point F (60, 10, 30), and Point A with straight lines in this order in a ternary composition diagram where coordinates of the composition are expressed as (Co content, Mn content, Al content) with each of the Co, Mn, and Al contents being expressed in atomic percentage.Type: ApplicationFiled: April 25, 2006Publication date: November 22, 2007Applicant: FUJITSU LIMITEDInventors: Arata Jogo, Hirotaka Oshima, Takahiro Ibusuki, Yutaka Shimizu, Takuya Uzumaki
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Publication number: 20070217083Abstract: A spin valve film has a lamination structure of a pinned layer, a non-magnetic intermediate layer and a free layer. The pinned layer is made of ferromagnetic material and has a fixed magnetization direction. The non-magnetic intermediate layer is made of non-magnetic conductive material. The free layer is made of ferromagnetic material and changes a magnetization direction by external magnetic field. Electrodes let current flow through the spin valve film in a lamination direction. At least one of the pinned layer and the free layer includes a lamination portion of a first layer and a second layer stacked alternately. The first layer has a composition ratio of elements presenting ferromagnetism higher than that in the second layer. The second layer has a composition ratio of elements presenting non-magnetism higher than that in the first layer. The lamination portion includes at least two first layers and at least one second layer.Type: ApplicationFiled: July 11, 2006Publication date: September 20, 2007Applicant: FUJITSU LIMITEDInventors: Keiichi Nagasaka, Hirotaka Oshima, Arata Jogo, Yutaka Shimizu
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Publication number: 20070048485Abstract: A magnetoresistive effect element of a CPP type includes a fixed magnetization layer, a non-magnetic layer and a free magnetization layer formed of CoFeAl. The CoFeAl has a composition falling within a range defined by straight lines connecting points A, B, C, D, E, F and A, in that order, in a ternary composition diagram. The point A is (55, 10, 35), the point B is (50, 15, 35), the point C is (50, 20, 30), the point D is (55, 25, 20), the point E is (60, 25, 15), and the point F is (70, 15, 15), where coordinates of the composition of each point is represented by (Co content, Fe content, Al content). Each content is expressed by atomic percent.Type: ApplicationFiled: May 22, 2006Publication date: March 1, 2007Applicant: FUJITSU LIMITEDInventors: Arata Jogo, Hirotaka Oshima, Keiichi Nagasaka
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Publication number: 20060209473Abstract: A magnetoresistive element of a CPP type configuration including a fixed magnetic layer, a first non-magnetic layer, a free magnetic layer, and a second non-magnetic layer is disclosed. The magnetoresistive element includes a first interface layer situated between the free magnetic layer and the first non-magnetic layer, and a second interface layer situated between the free magnetic layer and the second non-magnetic layer. The first interface layer and the second interface layer include a material mainly having CoNiFe.Type: ApplicationFiled: June 20, 2005Publication date: September 21, 2006Inventors: Hirotaka Oshima, Keiichi Nagasaka, Arata Jogo, Yutaka Shimizu, Atsushi Tanaka
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Publication number: 20050264952Abstract: A magneto-resistive element employs a CPP structure and includes an antiferromagnetic layer, a pinned magnetization layer, a nonmagnetic intermediate layer and a free magnetization layer that are successively stacked. The pinned magnetization layer includes a first pinned magnetization layer, a nonmagnetic coupling layer and a second pinned magnetization layer that are successively stacked on the antiferromagnetic layer. The first and second pinned magnetization layers are antiferromagnetically exchange-coupled. The first pinned magnetization layer includes a resistance control layer made of a ferromagnetic material that is added with an additive element.Type: ApplicationFiled: September 28, 2004Publication date: December 1, 2005Inventor: Hirotaka Oshima