Patents by Inventor Kunihiro Ueda
Kunihiro Ueda 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: 20170052232Abstract: A magnetic sensor device that can prevent an increase in detection error even when stress is applied to a magnetic sensor chip due to heat generation or the like at the time of operation includes a magnetic sensor chip that has a nearly-square shape in a plan view, and a die pad having a mounting surface where the magnetic sensor chip is mounted. Opening portions are formed at positions where four corners of the magnetic sensor chip mounted on the mounting surface overlap, respectively. An area ratio of the opening portions to an area of the die pad is 20% or greater. Also, an area of the overlapped portions with the magnetic sensor chip and the opening portions is 40% or greater relative to the area of the opening portions in a plan view of the die pad.Type: ApplicationFiled: June 29, 2016Publication date: February 23, 2017Inventors: Yoshimitsu WADA, Kunihiro UEDA
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Publication number: 20170045380Abstract: A rotary sensing device that can accurately detect a rotation direction, even if a rotating body rotates at a high speed, when a gap between a plurality of subjects for detection in a rotating body varies is equipped with first to Nth sensor elements that are aligned to oppose the rotating body, which is rotatable in a rotation direction that can be either a normal rotation direction or a reverse rotation direction, and in parallel in respective order along the rotation direction, and that output first to Nth (N?3) sensor signals based upon the rotation of the rotating body, respectively, and a rotation direction detecting part that detects the rotation direction of the rotating body based upon each sensor signal output from each sensor element, and the rotation direction detecting part detects the rotation direction of the rotating body from a first differential signal that is obtained from the first sensor signal and the Mth (3?M?N) sensor signal, and a second differential signal obtained from the first senType: ApplicationFiled: June 29, 2016Publication date: February 16, 2017Inventors: Kunihiro UEDA, Hiraku HIRABAYASHI
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Publication number: 20160282145Abstract: A magnetic sensor is provided with first and second magnetoresistive effect elements that can detect an external magnetic field. The first and second magnetoresistive effect elements include at least magnetization direction change layers where a direction of magnetization is changed according to an external magnetic field. The width W1 of a magnetization direction change layer in an initial magnetization direction of the magnetization direction change layer of the first magnetoresistive effect element, and the width W2 of a magnetization direction change layer in an initial magnetization direction of the magnetization direction change layer of the second magnetoresistive effect element have a relationship shown by formula (1) below. Sensitivity of the first magnetoresistive effect element to the external magnetic field is higher than that of the second magnetoresistive effect element.Type: ApplicationFiled: January 15, 2016Publication date: September 29, 2016Inventors: Kunihiro UEDA, Yoshiyuki MIZOGUCHI, Hiroshi YAMAZAKI, Suguru WATANABE
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Publication number: 20160282146Abstract: A magnetic sensor is provided with first and second magnetoresistive effect elements that can detect an external magnetic field. The first and second magnetoresistive effect elements are a plurality of layers of multilayer body including free layers where their magnetization directions vary due to the external magnetic field. Shapes of the first and second magnetoresistive effect elements viewed from the upper side in the lamination direction are different from each other. The first magnetoresistive effect element has a shape that can increase a slope of an output of the first magnetoresistive effect element relative to the change of the external magnetic field. The second magnetoresistive effect element has a shape that can decrease a slope of an output of the second magnetoresistive effect element relative to the change of the external magnetic field compared to the slope of the output of the first magnetoresistive effect element.Type: ApplicationFiled: January 15, 2016Publication date: September 29, 2016Inventors: Kunihiro UEDA, Yoshiyuki MIZOGUCHI, Hiroshi YAMAZAKI, Suguru WATANABE
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Patent number: 9257524Abstract: Semiconductors of different types are formed by a crystal growth technique and joined at the interface at which rapid atomic-layer-level compositional changes occur while maintaining high crystallinity of the semiconductor layers so as to form a heterogeneous PN junction. A layered film that includes a PN junction oxide thin film is formed on a single crystal substrate. The PN junction oxide thin film is constituted by an N-type semiconductor oxide thin film and a P-type semiconductor oxide thin film that are epitaxially grown to have c-axis orientation represented by (00k).Type: GrantFiled: March 8, 2013Date of Patent: February 9, 2016Assignee: TDK CORPORATIONInventors: Kazuya Maekawa, Kunihiro Ueda
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Patent number: 9200884Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit, a second detection circuit and a third detection circuit that are disposed at a first position, a second position and a third position, respectively. Each of the first to third detection circuits includes a spin-valve MR element. A difference between two of the first to third positions that are the most distant from each other in a first direction falls within a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates first and second post-computation signals having mutually different phases by computation using detection signals from the first to third detection circuits.Type: GrantFiled: January 27, 2014Date of Patent: December 1, 2015Assignee: TDK CORPORATIONInventors: Kunihiro Ueda, Hiraku Hirabayashi, Satoshi Abe, Homare Tokida
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Publication number: 20140292313Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit, a second detection circuit and a third detection circuit that are disposed at a first position, a second position and a third position, respectively. Each of the first to third detection circuits includes a spin-valve MR element. A difference between two of the first to third positions that are the most distant from each other in a first direction falls within a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates first and second post-computation signals having mutually different phases by computation using detection signals from the first to third detection circuits.Type: ApplicationFiled: January 27, 2014Publication date: October 2, 2014Applicant: TDK CORPORATIONInventors: Kunihiro UEDA, Hiraku HIRABAYASHI, Satoshi ABE, Homare TOKIDA
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Publication number: 20130240874Abstract: Semiconductors of different types are formed by a crystal growth technique and joined at the interface at which rapid atomic-layer-level compositional changes occur while maintaining high crystallinity of the semiconductor layers so as to form a heterogeneous PN junction. A layered film that includes a PN junction oxide thin film is formed on a single crystal substrate. The PN junction oxide thin film is constituted by an N-type semiconductor oxide thin film and a P-type semiconductor oxide thin film that are epitaxially grown to have c-axis orientation represented by (00k).Type: ApplicationFiled: March 8, 2013Publication date: September 19, 2013Applicant: TDK CORPORATIONInventors: Kazuya MAEKAWA, Kunihiro UEDA
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Patent number: 8420159Abstract: The method of fabricating a magnetic head slider includes steps of: forming a first protective film on an air bearing surface of a magnetic head slider on which either a recording element or a reproduction element is formed or on which both a recording element and a reproduction element are formed; removing a portion of the first protective film to reduce the thickness of the first protective film and forming a second protective film over the first protective film that has been reduced in thickness; and forming an uneven portion for controlling the flying characteristics of the magnetic head slider on the air bearing surface of the magnetic head slider; wherein the formation of the uneven portion is carried out after the first protective film has been formed and before the second protective film is formed, or after the second protective film has been formed.Type: GrantFiled: November 2, 2009Date of Patent: April 16, 2013Assignee: SAE Magnetics (H.K.) Ltd.Inventors: Kunihiro Ueda, Hong Xin Fang, Dong Wong
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Patent number: 8419905Abstract: A method for forming a diamond-like carbon (DLC) layer on air bearing surface (ABS) of a slider, comprises steps of: providing sliders arranged in arrays, each slider having an ABS; forming a mixing layer in the ABS of the slider by depositing a first DLC layer on the ABS, the mixing layer consisting of the slider material and the first DLC layer material; removing the first DLC layer to make the mixing layer exposed; forming a second DLC layer on the mixing layer.Type: GrantFiled: January 20, 2010Date of Patent: April 16, 2013Assignee: SAE Magnetics (H.K.) Ltd.Inventors: Kunihiro Ueda, Hongxin Fang, Dong Wang
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Patent number: 8310788Abstract: To provide a high-quality protection target by forming a protective film that is thin and excellent in corrosion resistance. Provided is a protective film forming method for forming a protective film at least on a surface of a protection target. The method comprises: a base film forming step for forming a base film on the surface of the protection target; and a DLC film forming step for forming a diamond-like carbon film on the base film. The base film forming step forms the base film on the surface of the protection target for a plurality of times by repeating a process of depositing the base film in a prescribed thickness and eliminating a part of or a whole part of the base film. Further, the method comprises, before the DLC film forming step, an insulating layer forming step for forming an insulating layer on the surface of the base film on which the diamond-like carbon film is to be formed.Type: GrantFiled: September 10, 2008Date of Patent: November 13, 2012Assignees: SAE Magnetics (H.K.) Ltd., Simadzu CorporationInventors: Kunihiro Ueda, Hong Xin Fang, Dong Wang, Yoshiyuki Konishi, Satoko Ueno, Shigenobu Okada
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Patent number: 8199436Abstract: A magnetic head slider according to the present invention comprises: a slider body including either a write head element or a read head element or both the write head element and the read head element; a seed layer provided on an air bearing surface of the slider body, the seed layer covering either the write head element or the read head element or both the write head element and the read head element, the seed layer having a film thickness that is less than 1 nm; and a protective film formed of diamond-like carbon, the protective film covering the seed layer. The seed layer is mainly formed of silicon and contains a 6A group element in a proportion of 2 atomic % or more and 30 atomic % or less.Type: GrantFiled: December 14, 2009Date of Patent: June 12, 2012Assignee: SAE Magnetics (H.K.) Ltd.Inventors: Taiki Yamada, Kunihiro Ueda
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Publication number: 20110174608Abstract: A method for forming a diamond-like carbon (DLC) layer on air bearing surface (ABS) of a slider, comprises steps of: providing sliders arranged in arrays, each slider having an ABS; forming a mixing layer in the ABS of the slider by depositing a first DLC layer on the ABS, the mixing layer consisting of the slider material and the first DLC layer material; removing the first DLC layer to make the mixing layer exposed; forming a second DLC layer on the mixing layer.Type: ApplicationFiled: January 20, 2010Publication date: July 21, 2011Applicant: SAE Magnetics (H.K.) Ltd.Inventors: Kunihiro UEDA, Hongxin Fang, Dong Wang
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Patent number: 7965471Abstract: A method for forming micro-texture on an air bearing surface of a magnetic read/write slider, includes: positioning sliders arranged in arrays on a tray, each slider having a pole tip facing upward; loading the tray into a processing chamber, which is then evacuated to a preset pressure; and introducing a processing gas containing oxygen into the processing chamber; exposing the sliders to etch the surface of the slider so as to form a clear two-step structure thereon.Type: GrantFiled: September 6, 2005Date of Patent: June 21, 2011Assignee: SAE Magnetics (H.K.) Ltd.Inventors: Kunihiro Ueda, HongTao Ma, Hong Xin Fang, Xiao Feng Qiao, Heng Qiao, Yong Zhu
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Publication number: 20100302683Abstract: A magnetic head slider according to the present invention comprises: a slider body including either a write head element or a read head element or both the write head element and the read head element; a seed layer provided on an air bearing surface of the slider body, the seed layer covering either the write head element or the read head element or both the write head element and the read head element, the seed layer having a film thickness that is less than 1 nm; and a protective film formed of diamond-like carbon, the protective film covering the seed layer. The seed layer is mainly formed of silicon and contains a 6A group element in a proportion of 2 atomic fractions or more and 30 atomic fractions or less.Type: ApplicationFiled: May 28, 2009Publication date: December 2, 2010Applicant: SAE Magnetics (H.K.) Ltd.Inventors: Taiki Yamada, Kunihiro Ueda
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Publication number: 20100302685Abstract: A magnetic head slider according to the present invention comprises: a slider body including either a write head element or a read head element or both the write head element and the read head element; a seed layer provided on an air bearing surface of the slider body, the seed layer covering either the write head element or the read head element or both the write head element and the read head element, the seed layer having a film thickness that is less than 1 nm; and a protective film formed of diamond-like carbon, the protective film covering the seed layer. The seed layer is mainly formed of silicon and contains a 6A group element in a proportion of 2 atomic fractions or more and 30 atomic fractions or less.Type: ApplicationFiled: December 14, 2009Publication date: December 2, 2010Applicant: SAE Magnetics (H.K.) Ltd.Inventors: Taiki Yamada, Kunihiro Ueda
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Publication number: 20100291294Abstract: The method of fabricating a magnetic head slider includes steps of: forming a first protective film on an air bearing surface of a magnetic head slider on which either a recording element or a reproduction element is formed or on which both a recording element and a reproduction element are formed; removing a portion of the first protective film to reduce the thickness of the first protective film and forming a second protective film over the first protective film that has been reduced in thickness; and forming an uneven portion for controlling the flying characteristics of the magnetic head slider on the air bearing surface of the magnetic head slider; wherein the formation of the uneven portion is carried out after the first protective film has been formed and before the second protective film is formed, or after the second protective film has been formed.Type: ApplicationFiled: November 2, 2009Publication date: November 18, 2010Applicant: SAE Magnetics (H.K.) Ltd.Inventors: Kunihiro Ueda, Hong Xin Fang, Dong Wong
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Publication number: 20100212141Abstract: A thin film made of a conductive material is formed on one surface of a long-sheet-shaped flexible base. The flexible base formed with the thin film made of the conductive material is wound in a roll shape to fabricate an original roll of coils. The flexible base formed with the thin film made of the conductive material is unwound from the original roll of coils, and rewound around an outer periphery of a core to fabricate a wound body. The wound body is cut in a direction orthogonal to the longitudinal direction of the core to make a coil intermediary body. A cut surface of the coil intermediate body which is cut from the wound body is lapped. Lead wires are attached to both ends of a winding section comprised of the conductive material within the coil intermediary body. The foregoing steps are performed in sequence to manufacture a coil.Type: ApplicationFiled: December 31, 2009Publication date: August 26, 2010Inventors: Kunihiro Ueda, Taiki Yamada, Osamu Harakawa
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Publication number: 20090135521Abstract: To provide a high-quality protection target by forming a protective film that is thin and excellent in corrosion resistance. Provided is a protective film forming method for forming a protective film at least on a surface of a protection target. The method comprises: a base film forming step for forming a base film on the surface of the protection target; and a DLC film forming step for forming a diamond-like carbon film on the base film. The base film forming step forms the base film on the surface of the protection target for a plurality of times by repeating a process of depositing the base film in a prescribed thickness and eliminating a part of or a whole part of the base film. Further, the method comprises, before the DLC film forming step, an insulating layer forming step for forming an insulating layer on the surface of the base film on which the diamond-like carbon film is to be formed.Type: ApplicationFiled: September 10, 2008Publication date: May 28, 2009Applicants: SAE Magnetics (H.K.) Ltd, SIMADZU CORPORATIONInventors: Kunihiro Ueda, Hong Xin Fang, Dong Wang, Yoshiyuki Konishi, Satoko Ueno, Shigenobu Okada
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Patent number: 7269889Abstract: As a protective film of an element and a slider in a magnetic head, a film is provided which is excellent in adhesiveness to a film forming surface and which shows sufficient corrosion-resistance property with a thinner thickness. To provided this film, according to the present invention, a DLC film as a protective film is formed onto an element portion end surface and a surface of a slider of a magnetic head core. A film deposition step is conducted plural times to obtain the DLC film with a predetermined thickness when the DLC film is formed using an electric discharge.Type: GrantFiled: September 10, 2002Date of Patent: September 18, 2007Assignee: TDK CorporationInventors: Kunihiro Ueda, Kentaro Nagai, Hiroki Nakazawa