Patents by Inventor Tomoyuki Maeda
Tomoyuki Maeda 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: 20200090685Abstract: According to one embodiment, a magnetic recording device includes a magnetic head, a first electrical circuit, and a second electrical circuit. The magnetic head includes a magnetic pole, a first shield, a conductive member electrically connecting the magnetic pole and the first shield and being provided between the magnetic pole and the first shield, and a coil. The first electrical circuit is configured to supply a first current to the magnetic pole, the conductive member, and the first shield. The second electrical circuit is configured to supply a recording current to the coil. A recording magnetic field is generated from the magnetic pole. The recording magnetic field corresponds to the recording current. A rise time of the recording current is not less than 65% of a shortest bit length.Type: ApplicationFiled: March 12, 2019Publication date: March 19, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Masayuki TAKAGISHI, Naoyuki NARITA, Tomoyuki MAEDA
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Publication number: 20200082845Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a magnetic layer, a first conductive layer, and a second conductive layer. The magnetic layer is provided between the magnetic pole and the first shield. The first conductive layer includes at least one of Cu, Ag, Au, Al and Cr, and is provided between the magnetic pole and the first shield. A direction from the first conductive layer toward the magnetic layer crosses a first direction from the magnetic pole toward the first shield. A second conductive layer includes at least one of Ta, Pt, W, Ru, Mo, Ir, Rh, and Pd and is provided at one of a first position or a second position. The first position is between the first conductive layer and the first shield. The second position is between the magnetic pole and the first conductive layer.Type: ApplicationFiled: March 12, 2019Publication date: March 12, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Hirofumi SUTO, Naoyuki NARITA, Tazumi NAGASAWA, Masayuki TAKAGISHI, Tomoyuki MAEDA
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Publication number: 20200075045Abstract: According to one embodiment, a magnetic head includes a magnetic pole, first and second shield regions, and a first stacked body. A direction from the magnetic pole toward the first shield region is aligned with a first direction. A direction from the magnetic pole toward the second shield region crosses the first direction. The first stacked body is provided between the magnetic pole and the second shield region. The first stacked body includes a first magnetic layer including at least one selected from the group consisting of Fe, Co, and Ni, a first conductive layer provided between the magnetic pole and the first magnetic layer, and a second conductive layer provided between the first magnetic layer and the second shield region. The first direction is aligned with a direction of relative movement between the magnetic pole and a magnetic recording medium. The magnetic pole opposes the magnetic recording medium.Type: ApplicationFiled: March 12, 2019Publication date: March 5, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Naoyuki NARITA, Tomoyuki MAEDA
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Publication number: 20200075047Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a second shield, a first stacked body and a second stacked body. At least a portion of the magnetic pole is provided between the first and second shields. The first stacked body is provided between the magnetic pole and the first shield. The second stacked body is provided between the magnetic pole and the second shield. The first stacked body includes a first magnetic layer including, a first conductive layer provided between the magnetic pole and the first magnetic layer, and a second conductive layer provided between the first magnetic layer and the first shield. The second stacked body includes a second magnetic layer including, a third conductive layer provided between the magnetic pole and the second magnetic layer, and a fourth conductive layer provided between the second magnetic layer and the second shield.Type: ApplicationFiled: March 12, 2019Publication date: March 5, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Naoyuki NARITA, Tomoyuki MAEDA
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Publication number: 20200058322Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body. The stacked body is provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer including at least one selected from the group consisting of Fe, Co, and Ni, a first conductive layer provided between the magnetic pole and the magnetic layer, the first conductive layer being nonmagnetic, and a second conductive layer provided between the magnetic layer and the first shield, the second conductive layer being nonmagnetic. The first conductive layer includes Ir. A thickness of the first conductive layer along a first direction is not less than 0.3 nm and not more than 0.8 nm. The first direction is from the first conductive layer toward the second conductive layer.Type: ApplicationFiled: March 8, 2019Publication date: February 20, 2020Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Naoyuki NARITA, Hirofumi SUTO, Tomoyuki MAEDA
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Patent number: 10460670Abstract: A display device is provided that includes a plurality of pixels, each of which includes an electroluminescent (EL) element and a drive transistor that controls a current flowing through the EL element. The display device also includes a gate driver circuit that applies, to each of the plurality of pixels, a compensation voltage for compensating a threshold voltage of the drive transistor, in each of compensation voltage application periods included in a period other than a period in which a video signal voltage is applied. The display device further includes a control circuit that controls the gate driver circuit, wherein the control circuit adjusts a length of, among the compensation voltage application periods, a preceding compensation voltage application period immediately before the video signal voltage is applied.Type: GrantFiled: January 17, 2017Date of Patent: October 29, 2019Assignee: JOLED INC.Inventor: Tomoyuki Maeda
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Patent number: 10438618Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, the first layer being nonmagnetic, a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer. The third layer includes a first magnetic region, and a second magnetic region contacting the first magnetic region and being provided between the first magnetic region and the second layer. A second saturation magnetization of the second magnetic region is higher than a first saturation magnetization of the first magnetic region.Type: GrantFiled: March 6, 2018Date of Patent: October 8, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Naoyuki Narita, Tomoyuki Maeda
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Patent number: 10403308Abstract: According to one embodiment, a magnetic disk device conforming to perpendicular magnetic recording includes a magnetic disk, a recording head, and a controller. The head includes a main magnetic pole, a return magnetic pole, a recording coil, and a conductive member in which end surfaces are connected to opposed surfaces of a write gap which is opposed to a distal portion of the main magnetic pole and a distal portion of the return magnetic pole, and a resistance value varies. The controller applies a current to the recording coil to excite the magnetic flux in the recording operation, and applies a current at a constant voltage to the magnetic circuit via the comductive member.Type: GrantFiled: February 14, 2018Date of Patent: September 3, 2019Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Gaku Koizumi, Akihiko Takeo, Naoyuki Narita, Masaya Ohtake, Yusuke Tomoda, Tomoyuki Maeda
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Patent number: 10396363Abstract: An object of the present invention is to provide a copper foil inexpensive and sufficient in tensile strength even after heat treatment. The copper foil includes zinc in a content range of 0.02% by mass to 2.7% by mass in the total mass of the entire copper foil, and if the regions in thicknesses direction from both surfaces of the copper foil where occupies 5% by mass in the total mass of the entire copper foil are referred to as the respective external layers and a region between one external layer and the other external layer is referred to as an internal layer, the internal layer includes copper as a main element and includes 100 ppm or more of one or mixture of small amount-elements selected from carbon, sulfur, chlorine and nitrogen, and includes zinc at 10% or more in the total mass of zinc included in the entire copper foil.Type: GrantFiled: May 21, 2013Date of Patent: August 27, 2019Assignee: MITSUI MINING & SMELTING CO., LTD.Inventors: Koichi Miyake, Tomoyuki Maeda, Kazutaka Hozumi, Hiroaki Nakahara, Shinichi Yamauchi
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Patent number: 10319296Abstract: A display device correction method performed by a control unit that performs display control on an organic electroluminescent (EL) panel including a plurality of display pixels, in an organic EL display which includes the organic EL panel and the control unit. The display device correction method includes: obtaining a cumulative value of a pixel signal supplied to a drive transistor which is included in a current pixel to be processed among the plurality of display pixels and supplies drive current according to the pixel signal to an organic EL element (OEL); calculating a shift amount of a threshold voltage of the drive transistor, using the cumulative value; calculating an amount of change in mobility, using the shift amount; and calculating a correction parameter for correcting a pixel signal, using the amount of change in mobility.Type: GrantFiled: August 27, 2015Date of Patent: June 11, 2019Assignee: JOLED INC.Inventors: Kazuki Sawa, Hiroshi Hayashi, Tomoyuki Maeda
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Patent number: 10304379Abstract: A display device includes: a display unit which includes a plurality of pixels each including an organic EL element; and a control unit which adjust a value of a luminance signal to be supplied to a target pixel to be corrected, such that an actual luminance of the target pixel is equal to a reference luminance, the reference luminance being an actual luminance of a reference pixel obtained when the luminance signal to be supplied to the target pixel is supplied to the reference pixel. The reference pixel has predetermined attenuation characteristics for light emission amount.Type: GrantFiled: May 12, 2015Date of Patent: May 28, 2019Assignee: JOLED, INC.Inventors: Masafumi Matsui, Eiji Iwauchi, Tomoyuki Maeda
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Patent number: 10276193Abstract: According to one embodiment, a magnetic head includes a magnetic pole having a first surface, a first shield separated from the magnetic pole along the first surface, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer, and first and second conductive layers. The magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni. The first conductive layer contacts the magnetic pole and the magnetic layer, and is provided between the magnetic pole and the magnetic layer. The second conductive layer contacts the magnetic layer and the first shield, is provided between the magnetic layer and the first shield. The first shield has a first shield surface contacting the second conductive layer. A ratio of a length of the magnetic layer to a length of the first shield surface is 0.1 or more.Type: GrantFiled: March 6, 2018Date of Patent: April 30, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Naoyuki Narita, Tomoyuki Maeda, Masaya Ohtake, Gaku Koizumi, Yusuke Tomoda, Akihiko Takeo
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Patent number: 10276095Abstract: A display device includes: a display unit including display pixels each of which includes: an organic EL element that emits light in response to a drive current; and a drive transistor that supplies a drive current corresponding to a magnitude of a luminance signal to the organic EL element; a measurement pixel located outside the display unit including: a measurement element composed of an organic EL element; and a measurement transistor that supplies a drive current to the measurement element; a current measurement unit that measures a current of the measurement pixel in a predetermined degradation state; a deviation calculation unit that calculates a deviation between a theoretical first correction amount of the luminance signal and a second correction amount of the luminance signal calculated from the measured current; and a luminance signal correction unit that corrects a theoretical third correction amount of the luminance signal of the display pixel.Type: GrantFiled: August 10, 2015Date of Patent: April 30, 2019Assignee: JOLED INC.Inventor: Tomoyuki Maeda
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Publication number: 20190088274Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, the first layer being nonmagnetic, a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer. The third layer includes a first magnetic region, and a second magnetic region contacting the first magnetic region and being provided between the first magnetic region and the second layer. A second saturation magnetization of the second magnetic region is higher than a first saturation magnetization of the first magnetic region.Type: ApplicationFiled: March 6, 2018Publication date: March 21, 2019Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Naoyuki NARITA, Tomoyuki MAEDA
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Publication number: 20190088275Abstract: According to one embodiment, a magnetic head includes a magnetic pole having a first surface, a first shield separated from the magnetic pole along the first surface, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer, and first and second conductive layers. The magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni. The first conductive layer contacts the magnetic pole and the magnetic layer, and is provided between the magnetic pole and the magnetic layer. The second conductive layer contacts the magnetic layer and the first shield, is provided between the magnetic layer and the first shield. The first shield has a first shield surface contacting the second conductive layer. A ratio of a length of the magnetic layer to a length of the first shield surface is 0.1 or more.Type: ApplicationFiled: March 6, 2018Publication date: March 21, 2019Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Naoyuki NARITA, Tomoyuki MAEDA, Masaya OHTAKE, Gaku KOIZUMI, Yusuke TOMODA, Akihiko TAKEO
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Patent number: 10236021Abstract: A magnetic recording apparatus includes a magnetic recording medium; a magnetic recording head including a first magnetic pole part, a second magnetic pole part, and a magnetic flux control part provided between the first magnetic pole part and the second magnetic pole part, wherein the magnetic flux control part includes a first layer provided between the first magnetic pole part and the second magnetic pole part, a second layer provided between the first magnetic pole part and the first layer, and a third layer provided between the second magnetic pole part and the first layer; an electrode for applying a current to the magnetic flux control part; and an electric circuit for energizing the current to the electrode, wherein an oscillation frequency of magnetization of the magnetic layer is greater than a ferromagnetic resonance frequency of the magnetic recording medium.Type: GrantFiled: August 28, 2017Date of Patent: March 19, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Naoyuki Narita, Masayuki Takagishi, Kenichiro Yamada, Tomoyuki Maeda, Akihiko Takeo
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Publication number: 20190066717Abstract: A magnetic head includes a main magnetic pole, a write shield separated from the main magnetic pole by a write gap, a first side shield that is separated from the main magnetic pole by a first side gap, a second side shield that is separated from the main magnetic pole by a second side gap, a first layer that has a first magnetic relative permeability and is disposed in the write gap between the main magnetic pole and the write shield, and a second layer that has a second magnetic relative permeability and is disposed in the first side gap and the second side gap, wherein the first magnetic relative permeability is smaller than the second magnetic relative permeability.Type: ApplicationFiled: February 22, 2018Publication date: February 28, 2019Inventors: Masaya OHTAKE, Akihiko Takeo, Naoyuki Narita, Gaku Koizumi, Yusuke Tomoda, Tomoyuki Maeda
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Publication number: 20190051322Abstract: According to one embodiment, a magnetic disk device conforming to perpendicular magnetic recording includes a magnetic disk, a recording head, and a controller. The head includes a main magnetic pole, a return magnetic pole, a recording coil, and a conductive member in which end surfaces are connected to opposed surfaces of a write gap which is opposed to a distal portion of the main magnetic pole and a distal portion of the return magnetic pole, and a resistance value varies. The controller applies a current to the recording coil to excite the magnetic flux in the recording operation, and applies a current at a constant voltage to the magnetic circuit via the comductive member.Type: ApplicationFiled: February 14, 2018Publication date: February 14, 2019Inventors: Gaku Koizumi, Akihiko Takeo, Naoyuki Narita, Masaya Ohtake, Yusuke Tomoda, Tomoyuki Maeda
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Publication number: 20190013042Abstract: According to one embodiment, a magnetic recording and reproducing device includes an output driver, a magnetic head, and a magnetic recording medium. The output driver outputs a recording signal corresponding to input information. The magnetic head includes a coil. A recording current includes the recording signal flows in the coil. Information corresponding to the input information is recorded in the magnetic recording medium. The input information includes first, second, and third information combinations. The first information combination includes first to fourth information. The second information combination includes fifth to eighth information. The third information combination includes ninth to twelfth information. The recording signal changes to an eleventh recording current to correspond to the eleventh information. The recording signal changes to a third recording current to correspond to the third information.Type: ApplicationFiled: March 15, 2018Publication date: January 10, 2019Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masayuki TAKAGISHI, Tomoyuki MAEDA, Yousuke ISOWAKI, Naoyuki NARITA, Katsuya SUGAWARA
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Patent number: 10170141Abstract: According to one embodiment, a magnetic recording and reproducing device includes an output driver, a magnetic head, and a magnetic recording medium. The output driver outputs a recording signal corresponding to input information. The magnetic head includes a coil. A recording current includes the recording signal flows in the coil. Information corresponding to the input information is recorded in the magnetic recording medium. The input information includes first, second, and third information combinations. The first information combination includes first to fourth information. The second information combination includes fifth to eighth information. The third information combination includes ninth to twelfth information. The recording signal changes to an eleventh recording current to correspond to the eleventh information. The recording signal changes to a third recording current to correspond to the third information.Type: GrantFiled: March 15, 2018Date of Patent: January 1, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Masayuki Takagishi, Tomoyuki Maeda, Yousuke Isowaki, Naoyuki Narita, Katsuya Sugawara