Patents by Inventor Nobuyoshi Yamasaki
Nobuyoshi Yamasaki 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: 10643658Abstract: A disk apparatus includes a disk, a head, a circuit board, and an abnormality detection circuit. The head includes a plurality of loads, including at least a first load and a second load, associated with writing or reading of data to or from the disk, and a plurality of head terminals corresponding to and connected to the plurality of loads, respectively. The circuit board includes board terminals corresponding to and connected to the plurality of head terminals, respectively, and a preamplifier that applies a voltage to the loads via the plurality of board terminals during writing or reading of the data to or from the disk. The abnormality detection circuit detects a short-circuit between a first board terminal, which is the board terminal connected to the head terminal of the first load, and a second board terminal, which is the board terminal connected to the head terminal of the second load.Type: GrantFiled: February 14, 2019Date of Patent: May 5, 2020Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventor: Nobuyoshi Yamasaki
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Patent number: 10468072Abstract: A disk drive includes a metal base that has a rectangular bottom wall and side walls formed on each side of the rectangular bottom wall, the side walls including a first side wall on a shorter side, a metal cover that is fixed to the metal base with a plurality of metal screws, including two screws disposed at opposite ends of the side wall, a gap being formed between an upper end of the first side wall and the metal cover, a magnetic disk disposed on the metal base, at a position offset from a center of the metal base in a longitudinal direction towards the first side wall, and a head. The first side wall and the metal cover are electrically connected at an intermediate position of the first side wall between said opposite ends of the first side wall.Type: GrantFiled: May 15, 2018Date of Patent: November 5, 2019Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Nobuyoshi Yamasaki, Toshihiro Tsujimura
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Publication number: 20190180784Abstract: A disk apparatus includes a disk, a head, a circuit board, and an abnormality detection circuit. The head includes a plurality of loads, including at least a first load and a second load, associated with writing or reading of data to or from the disk, and a plurality of head terminals corresponding to and connected to the plurality of loads, respectively. The circuit board includes board terminals corresponding to and connected to the plurality of head terminals, respectively, and a preamplifier that applies a voltage to the loads via the plurality of board terminals during writing or reading of the data to or from the disk. The abnormality detection circuit detects a short-circuit between a first board terminal, which is the board terminal connected to the head terminal of the first load, and a second board terminal, which is the board terminal connected to the head terminal of the second load.Type: ApplicationFiled: February 14, 2019Publication date: June 13, 2019Inventor: Nobuyoshi YAMASAKI
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Patent number: 10242708Abstract: A disk apparatus includes a disk, a head, a circuit board, and an abnormality detection circuit. The head includes a plurality of loads, including at least a first load and a second load, associated with writing or reading of data to or from the disk, and a plurality of head terminals corresponding to and connected to the plurality of loads, respectively. The circuit board includes board terminals corresponding to and connected to the plurality of head terminals, respectively, and a preamplifier that applies a voltage to the loads via the plurality of board terminals during writing or reading of the data to or from the disk. The abnormality detection circuit detects a short-circuit between a first board terminal, which is the board terminal connected to the head terminal of the first load, and a second board terminal, which is the board terminal connected to the head terminal of the second load.Type: GrantFiled: March 1, 2018Date of Patent: March 26, 2019Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventor: Nobuyoshi Yamasaki
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Publication number: 20190066729Abstract: A disk apparatus includes a disk, a head, a circuit board, and an abnormality detection circuit. The head includes a plurality of loads, including at least a first load and a second load, associated with writing or reading of data to or from the disk, and a plurality of head terminals corresponding to and connected to the plurality of loads, respectively. The circuit board includes board terminals corresponding to and connected to the plurality of head terminals, respectively, and a preamplifier that applies a voltage to the loads via the plurality of board terminals during writing or reading of the data to or from the disk. The abnormality detection circuit detects a short-circuit between a first board terminal, which is the board terminal connected to the head terminal of the first load, and a second board terminal, which is the board terminal connected to the head terminal of the second load.Type: ApplicationFiled: March 1, 2018Publication date: February 28, 2019Inventor: Nobuyoshi YAMASAKI
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Publication number: 20180268875Abstract: A disk drive includes a metal base that has a rectangular bottom wall and side walls formed on each side of the rectangular bottom wall, the side walls including a first side wall on a shorter side, a metal cover that is fixed to the metal base with a plurality of metal screws, including two screws disposed at opposite ends of the side wall, a gap being formed between an upper end of the first side wall and the metal cover, a magnetic disk disposed on the metal base, at a position offset from a center of the metal base in a longitudinal direction towards the first side wall, and a head. The first side wall and the metal cover are electrically connected at an intermediate position of the first side wall between said opposite ends of the first side wall.Type: ApplicationFiled: May 15, 2018Publication date: September 20, 2018Inventors: Nobuyoshi YAMASAKI, Toshihiro TSUJIMURA
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Publication number: 20170294215Abstract: A disk drive includes a metal base that has a rectangular bottom wall and side walls formed on each side of the rectangular bottom wall, the side walls including a first side wall on a shorter side, a metal cover that is fixed to the metal base with a plurality of metal screws, including two screws disposed at opposite ends of the side wall, a gap being formed between an upper end of the first side wall and the metal cover, a magnetic disk disposed on the metal base, at a position offset from a center of the metal base in a longitudinal direction towards the first side wall, and a head. The first side wall and the metal cover are electrically connected at an intermediate position of the first side wall between said opposite ends of the first side wall.Type: ApplicationFiled: December 27, 2016Publication date: October 12, 2017Inventors: Nobuyoshi YAMASAKI, Toshihiro TSUJIMURA
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Patent number: 9702909Abstract: A manufacturing method is used for a current sensor including a current measurement circuit configured to include magnetoelectric conversion elements, a first amplification-and-correction circuit configured to amplify an output of the current measurement circuit and correct, based on a set first correction amount, a temperature characteristic of an offset, a second amplification-and-correction circuit configured to amplify an output of the first amplification-and-correction circuit, adjust a sensitivity, and correct, based on a set second correction amount, a magnitude of the offset, and a substrate in which the current measurement circuit, the first amplification-and-correction circuit, and the second amplification-and-correction circuit are provided, wherein after the first correction amount is set based on characteristics of the magnetoelectric conversion elements, the magnetoelectric conversion elements are mounted in the substrate and the second correction amount is set.Type: GrantFiled: November 13, 2014Date of Patent: July 11, 2017Assignee: ALPS ELECTRIC CO., LTD.Inventors: Ken Kawahata, Nobuyoshi Yamasaki, Masatoshi Nomura
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Patent number: 9666226Abstract: An integrated circuit connectable to a signal transmission path of a storage device includes an impedance setting circuit including a plurality of switches, a detector configured to detect an input signal level, and a decoder. The decoder controls one or more switches of the impedance setting circuit based on the detected input signal level so as to match an impedance of the integrated circuit with an impedance of the signal transmission path.Type: GrantFiled: March 2, 2016Date of Patent: May 30, 2017Assignee: Kabushiki Kaisha ToshibaInventor: Nobuyoshi Yamasaki
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Publication number: 20170148481Abstract: An integrated circuit connectable to a signal transmission path of a storage device includes an impedance setting circuit including a plurality of switches, a detector configured to detect an input signal level, and a decoder. The decoder controls one or more switches of the impedance setting circuit based on the detected input signal level so as to match an impedance of the integrated circuit with an impedance of the signal transmission path.Type: ApplicationFiled: March 2, 2016Publication date: May 25, 2017Inventor: Nobuyoshi YAMASAKI
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Patent number: 8988816Abstract: According to one embodiment, a magnetic disk apparatus includes a plurality of magnetic disks, a plurality of heads which execute recording or reading with respect to the magnetic disks, a plurality of sensors provided in each of the heads and output a signal in accordance with a flying height of the heads from the magnetic disks, a writing module which simultaneously writes servo data in the plurality of magnetic disks by using the plurality of heads, and a control module which simultaneously executes a process for detecting a crash of the heads into the magnetic disks for the plurality of heads based on each output signal of the plurality of sensors when the servo data is written.Type: GrantFiled: February 4, 2014Date of Patent: March 24, 2015Assignee: Kabushiki Kaisha ToshibaInventor: Nobuyoshi Yamasaki
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Publication number: 20150069997Abstract: A manufacturing method is used for a current sensor including a current measurement circuit configured to include magnetoelectric conversion elements, a first amplification-and-correction circuit configured to amplify an output of the current measurement circuit and correct, based on a set first correction amount, a temperature characteristic of an offset, a second amplification-and-correction circuit configured to amplify an output of the first amplification-and-correction circuit, adjust a sensitivity, and correct, based on a set second correction amount, a magnitude of the offset, and a substrate in which the current measurement circuit, the first amplification-and-correction circuit, and the second amplification-and-correction circuit are provided, wherein after the first correction amount is set based on characteristics of the magnetoelectric conversion elements, the magnetoelectric conversion elements are mounted in the substrate and the second correction amount is set.Type: ApplicationFiled: November 13, 2014Publication date: March 12, 2015Inventors: Ken KAWAHATA, Nobuyoshi YAMASAKI, Masatoshi NOMURA
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Patent number: 7843659Abstract: A head IC adjusts an amplitude level of a read signal of a head and outputs the adjusted signal to a read channel having an AGC amplifier. A head IC includes: a differential amplifier; an AGC circuit; external gain setting sections; and a switch. The AGC amplifier is disposed in the head IC, and the amplitude from the head is automatically adjusted in the head IC. The signal level can be adjusted within the input dynamic range of the AGC amplifier of the read channel. An estimated gain value converted from a result of measuring a resistance value of the head is used as an initial value for the adjustment of the AGC amplifier. It becomes possible attempting to prevent an increase in the lock-in times of the AGC, to guarantee stability, and to prevent judgment errors of the AGC.Type: GrantFiled: August 27, 2008Date of Patent: November 30, 2010Assignee: Toshiba Storage Device CorporationInventor: Nobuyoshi Yamasaki
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Patent number: 7642789Abstract: The present invention provides a storage device and a writing unit diagnosing method, which can determine a defect in a writing unit at an early stage. There is provided a storage device, which includes writing units that write data to a storage medium, current application units that apply a current to the writing units, electric property measurement units that measure the electric property of the writing units at the time of applying a current by the current application units, and obtain electric property measured values, a storage unit that stores the electric property measured values obtained by the electric property measurement units, and a judgment unit that judges whether or not the writing units are abnormal based on the electric property measured values stored in the storage unit.Type: GrantFiled: January 30, 2007Date of Patent: January 5, 2010Assignee: Toshiba Storage Device CorporationInventors: Nobuyoshi Yamasaki, Masao Kondo
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Patent number: 7589541Abstract: Provided is a method for inspecting a solid-state image pickup device by irradiating a solid-state image pickup device with measuring light emitted from a light source. The light source is a surface light emitter that includes a plurality of pixels, and each of the plurality of pixels includes a combination of a red LED, a green LED and a blue LED.Type: GrantFiled: June 15, 2006Date of Patent: September 15, 2009Assignee: FUJIFILM CorporationInventor: Nobuyoshi Yamasaki
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Publication number: 20090147408Abstract: A head IC adjusts an amplitude level of a read signal of a head and outputs the adjusted signal to a read channel having an AGC amplifier. A head IC includes: a differential amplifier; an AGC circuit; external gain setting sections; and a switch. The AGC amplifier is disposed in the head IC, and the amplitude from the head is automatically adjusted in the head IC. The signal level can be adjusted within the input dynamic range of the AGC amplifier of the read channel. An estimated gain value converted from a result of measuring a resistance value of the head is used as an initial value for the adjustment of the AGC amplifier. It becomes possible attempting to prevent an increase in the lock-in times of the AGC, to guarantee stability, and to prevent judgment errors of the AGC.Type: ApplicationFiled: August 27, 2008Publication date: June 11, 2009Applicant: FUJITSU LIMITEDInventor: Nobuyoshi Yamasaki
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Publication number: 20080079438Abstract: The present invention provides a storage device and a writing unit diagnosing method, which can determine a defect in a writing unit at an early stage. There is provided a storage device, which includes writing units that write data to a storage medium, current application units that apply a current to the writing units, electric property measurement units that measure the electric property of the writing units at the time of applying a current by the current application units, and obtain electric property measured values, a storage unit that stores the electric property measured values obtained by the electric property measurement units, and a judgment unit that judges whether or not the writing units are abnormal based on the electric property measured values stored in the storage unit.Type: ApplicationFiled: January 30, 2007Publication date: April 3, 2008Inventors: Nobuyoshi Yamasaki, Masao Kondo
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Publication number: 20080074772Abstract: A magnetic recording and reproducing device comprising a magnetic head for writing data to a storage medium by write current, and a computing unit that has a program area for determining a value indicating a signal quality of data read from the recording medium, and a memory area for holding a first write current value which is a predetermined optimum value and a second write current value which is lower than the first write current value.Type: ApplicationFiled: November 20, 2007Publication date: March 27, 2008Applicant: Fujitsu LimitedInventors: Nobuyoshi Yamasaki, Yuichiro Yamazaki
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Publication number: 20070001099Abstract: A method for inspecting a solid-state image pickup device by irradiating a solid-state image pickup device with measuring light emitted from a light source, wherein the light source is a surface light emitter comprising a plurality of pixels each including a combination of a red LED, a green LED and a blue LED.Type: ApplicationFiled: June 15, 2006Publication date: January 4, 2007Inventor: Nobuyoshi Yamasaki
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Patent number: D701355Type: GrantFiled: September 10, 2013Date of Patent: March 18, 2014Inventor: Robert Nobuyoshi Yamasaki