Patents by Inventor Yasuyuki Okada

Yasuyuki Okada 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).

  • Publication number: 20190317250
    Abstract: An anti-reflective structural body is constituted of an integrally molded article and includes an anti-reflective structure formed on a base surface that constitutes an outer surface of the molded article, and the anti-reflective structure includes a plurality of recesses, each being formed to be recessed from the base surface independently of mutually adjacent recesses and having an inclined surface, which is inclined with respect to the base surface and forms at least one punctiform or linear apex portion at a bottom portion.
    Type: Application
    Filed: July 11, 2017
    Publication date: October 17, 2019
    Applicant: OTSUKA TECHNO CORPORATION
    Inventors: Yasuyuki OKADA, Hideaki SATO, Yosuke KAMIKADO, Yukio TAKAHASHI, Yuta UCHIYAMA, Naoki OYAMA, Shunsuke MORIMOTO
  • Patent number: 10335744
    Abstract: A sheet filter membrane is arranged on a surface of a filter plate of a thermoplastic resin, and a plurality of projections provided in a hot plate is pressed against the filter plate above a periphery of the filter membrane with different timing for each of the projections to abut on the filter membrane. A plurality of recessed bonding portions with different depths are thus formed in the filter plate, and the filter membrane is bonded to the filter plate by heat welding in each of the recessed bonding portions. Sealing is therefore provided between the filter membrane and the filter plate along the periphery of the filter membrane.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: July 2, 2019
    Assignee: Kubota Corporation
    Inventors: Kimihiro Ishikawa, Yasuyuki Okada
  • Publication number: 20170239625
    Abstract: A sheet filter membrane is arranged on a surface of a filter plate of a thermoplastic resin, and a plurality of projections provided in a hot plate is pressed against the filter plate above a periphery of the filter membrane with different timing for each of the projections to abut on the filter membrane. A plurality of recessed bonding portions with different depths are thus formed in the filter plate, and the filter membrane is bonded to the filter plate by heat welding in each of the recessed bonding portions. Sealing is therefore provided between the filter membrane and the filter plate along the periphery of the filter membrane.
    Type: Application
    Filed: March 13, 2015
    Publication date: August 24, 2017
    Applicant: Kubota Corporation
    Inventors: Kimihiro Ishikawa, Yasuyuki Okada
  • Patent number: 9250301
    Abstract: A magnetic medium is magnetized in the relative movement direction at a predefined pitch km and a magnetic sensor includes plural magnetoresistive elements whose electrical resistance value changes depending on a magnetic field at a place where the magnetoresistive element is disposed. A position where the magnetoresistive element is disposed is defined as a reference position and, in addition to the magnetoresistive element of this reference position, the magnetoresistive elements as harmonic reducing patterns are disposed at the following positions, with P(n) defined as the n-th prime: a position offset by ?m/(2·P(n)) from the reference position toward at least one side of the relative movement direction, wherein N?n>1 and N is a natural number satisfying N>3, and a position further offset by ?m/(2·P(L+1)) from a position offset by ?m/(2·P(L)), wherein 1<L<N.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: February 2, 2016
    Assignee: HITACHI METALS, LTD.
    Inventors: Yasuyuki Okada, Yasunori Abe
  • Publication number: 20140152299
    Abstract: A magnetic medium is magnetized in the relative movement direction at a predefined pitch ?m and a magnetic sensor includes plural magnetoresistive elements whose electrical resistance value changes depending on a magnetic field at a place where the magnetoresistive element is disposed. A position where the magnetoresistive element is disposed is defined as a reference position and, in addition to the magnetoresistive element of this reference position, the magnetoresistive elements as harmonic reducing patterns are disposed at the following positions, with P(n) defined as the n-th prime: a position offset by ?m/(2·P(n)) from the reference position toward at least one side of the relative movement direction, wherein N?n>1 and N is a natural number satisfying N>3, and a position further offset by ?m/(2·P(L+1)) from a position offset by ?m/(2·P(L)), wherein 1<L<N.
    Type: Application
    Filed: August 10, 2012
    Publication date: June 5, 2014
    Applicant: HITACHI METALS, LTD.
    Inventors: Yasuyuki Okada, Yasunori Abe
  • Patent number: 8093886
    Abstract: A rotation-angle-detecting apparatus comprising a magnet rotor, a magnetic sensor detecting the direction of magnetic flux from the magnet rotor, a correction circuit, and an angle-calculating circuit, the magnetic sensor having bridge circuits X and Y each comprising four connected magnetoresistive devices, each magnetoresistive device comprising a spin-valve, giant-magnetoresistive film, the correction circuit calculating difference (Vx?Vy) and sum (Vx+Vy) from the output voltage Vx of the bridge circuit X and the output voltage Vy of the bridge circuit Y, and making their amplitudes equal to each other, and the angle-calculating circuit determining the rotation angle of the rotor by arctangent calculation from a signal (Vx?Vy)? and a signal (Vx+Vy)? supplied with the same amplitude from the correction circuit.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: January 10, 2012
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yasuyuki Okada, Kyohei Aimuta, Chiharu Mitsumata
  • Patent number: 8085499
    Abstract: Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field, while also being modified to suppress remanent magnetic fields occurring immediately after writing operation. A return path is provided for supplying a magnetic flux to the main pole, and an conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer and the high saturation flux density suppress remanent magnetization and prevent erasing after writing by utilizing a closed magnetic domain structure in the pole.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: December 27, 2011
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Yoshiaki Kawato, Kazuhiro Nakamoto, Hiroyuki Hoshiya, Yasuyuki Okada, Masafumi Mochizuki
  • Patent number: 8054067
    Abstract: A magnetic sensor comprising a bridge circuit in which four magnetoresistive devices are connected, the magnetoresistive device comprising a spin-valve, giant-magnetoresistive film comprising a pinned layer having unidirectional magnetic anisotropy, a free layer whose magnetization direction is rotated in alignment with an external magnetic field direction, and an intermediate layer sandwiched by the pinned layer and the free layer, and at least one of the magnetoresistive devices meeting the condition of 36°??<45°, wherein ? is an acute angle between its longitudinal direction and the magnetization direction of the pinned layer.
    Type: Grant
    Filed: January 26, 2009
    Date of Patent: November 8, 2011
    Assignee: Hitachi Metals Ltd.
    Inventors: Yasuyuki Okada, Chiharu Mitsumata
  • Publication number: 20110037459
    Abstract: A rotation-angle-detecting apparatus comprising a magnet rotor, a magnetic sensor detecting the direction of magnetic flux from the magnet rotor, a correction circuit, and an angle-calculating circuit, the magnetic sensor having bridge circuits X and Y each comprising four connected magnetoresistive devices, each magnetoresistive device comprising a spin-valve, giant-magnetoresistive film, the correction circuit calculating difference (Vx?Vy) and sum (Vx+Vy) from the output voltage Vx of the bridge circuit X and the output voltage Vy of the bridge circuit Y, and making their amplitudes equal to each other, and the angle-calculating circuit determining the rotation angle of the rotor by arctangent calculation from a signal (Vx?Vy)? and a signal (Vx+Vy)? supplied with the same amplitude from the correction circuit.
    Type: Application
    Filed: March 26, 2010
    Publication date: February 17, 2011
    Applicant: Hitachi Metals, Ltd.
    Inventors: Yasuyuki Okada, Kyohei Aimuta, Chiharu Mitsumata
  • Publication number: 20110007417
    Abstract: Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field, while also being modified to suppress remanent magnetic fields occurring immediately after writing operation. A return path is provided for supplying a magnetic flux to the main pole, and an conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer and the high saturation flux density suppress remanent magnetization and prevent erasing after writing by utilizing a closed magnetic domain structure in the pole.
    Type: Application
    Filed: September 23, 2010
    Publication date: January 13, 2011
    Inventors: Yoshiaki KAWATO, Kazuhiro NAKAMOTO, Hiroyuki HOSHIYA, Yasuyuki OKADA, Masafumi MOCHIZUKI
  • Patent number: 7859797
    Abstract: Embodiments in accordance with the present invention provide a Current Perpendicular to the Plane—Giant Magnetoresistive (CPP-GMR) head exhibiting a high magnetoresistance (MR) ratio with a low area-resistance product. A lower shield is made up of a first shield layer/a crystalline reset layer/a second shield layer, and an amorphous material is used in at least a part of the crystalline reset layer, thereby controlling crystallinity of the second lower shield/the CPP-GMR head.
    Type: Grant
    Filed: January 18, 2007
    Date of Patent: December 28, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Katsumi Hoshino, Hiroyuki Hoshiya, Yasuyuki Okada
  • Patent number: 7813079
    Abstract: Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field, while also being modified to suppress remanent magnetic fields occurring immediately after writing operation. A return path is provided for supplying a magnetic flux to the main pole, and an conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer and the high saturation flux density suppress remanent magnetization and prevent erasing after writing by utilizing a closed magnetic domain structure in the pole.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: October 12, 2010
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Yoshiaki Kawato, Kazuhiro Nakamoto, Hiroyuki Hoshiya, Yasuyuki Okada, Masafumi Mochizuki
  • Patent number: 7667520
    Abstract: The level shift device of the present invention comprises: a level shift circuit which converts a voltage level of a single input signal; and a duty correcting circuit which offsets a difference in the duty of an output signal of the level shift circuit with respect to the duty of the input signal.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: February 23, 2010
    Assignee: Panasonic Corporation
    Inventors: Hiroshi Inoue, Yorimasa Funahashi, Satoshi Nakashima, Yasuyuki Okada
  • Patent number: 7656611
    Abstract: A perpendicular write head includes a main pole comprising high moment magnetic layers laminated with both soft magnetic layers and non-magnetic layers for antiferromagnetic coupling (AFC) between the high moment material layers. The perpendicular write head includes a return pole connected to the main pole by a back gap closure at a distal end and separated from the main pole by a gap at an air bearing surface (ABS). A write coil is positioned between the main pole and the return pole and the surface area of the return pole at the ABS is substantially larger than the surface area of the main pole at the ABS.
    Type: Grant
    Filed: August 27, 2004
    Date of Patent: February 2, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V,
    Inventors: Yinshi Liu, Nian-Xiang Sun, Yunxiao Gao, Yimin Hsu, Tomohiro Okada, Yasuyuki Okada
  • Publication number: 20090189601
    Abstract: A magnetic sensor comprising a bridge circuit in which four magnetoresistive devices are connected, the magnetoresistive device comprising a spin-valve, giant-magnetoresistive film comprising a pinned layer having unidirectional magnetic anisotropy, a free layer whose magnetization direction is rotated in alignment with an external magnetic field direction, and an intermediate layer sandwiched by the pinned layer and the free layer, and at least one of the magnetoresistive devices meeting the condition of 36°??<45°, wherein ? is an acute angle between its longitudinal direction and the magnetization direction of the pinned layer.
    Type: Application
    Filed: January 26, 2009
    Publication date: July 30, 2009
    Applicant: HITACHI METALS, LTD.
    Inventors: Yasuyuki OKADA, Chiharu MITSUMATA
  • Patent number: 7532433
    Abstract: Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field, while also being modified to suppress remanent magnetic fields occurring immediately after writing operation. A return path is provided for supplying a magnetic flux to the main pole, and an conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer and the high saturation flux density suppress remanent magnetization and prevent erasing after writing by utilizing a closed magnetic domain structure in the pole.
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: May 12, 2009
    Assignee: Hitachi Global Storage Technologies Japa
    Inventors: Yoshiaki Kawato, Kazuhiro Nakamoto, Hiroyuki Hoshiya, Yasuyuki Okada, Masafumi Mochizuki
  • Publication number: 20090059425
    Abstract: Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field, while also being modified to suppress remanent magnetic fields occurring immediately after writing operation. A return path is provided for supplying a magnetic flux to the main pole, and an conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer and the high saturation flux density suppress remanent magnetization and prevent erasing after writing by utilizing a closed magnetic domain structure in the pole.
    Type: Application
    Filed: October 21, 2008
    Publication date: March 5, 2009
    Inventors: Yoshiaki Kawato, Kazuhiro Nakamoto, Hiroyuki Hoshiya, Yasuyuki Okada, Masafumi Mochizuki
  • Patent number: 7491986
    Abstract: A different electric power supply electric power source cell is proposed which includes paths by which electric power source voltages, the electric potentials of which are different from each other, are respectively taken in from the area pad and the probing pad and by which the voltages are supplied to the blocks requiring these electric power source voltages.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: February 17, 2009
    Assignee: Panasonic Corporation
    Inventors: Takaaki Kumagae, Yasuyuki Okada, Masumi Nobata
  • Patent number: 7443636
    Abstract: Embodiments of the invention implement a construction capable of reconciling high read output with high stability by improving the structures of magnetic films. In one embodiment, an inclined crystal grain structure is applied to a soft magnetic free layer, ferromagnetic pinned layer and so forth, thereby enhancing electron scatter performance of thin magnetic films.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: October 28, 2008
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Katsumi Hoshino, Hiroyuki Hoshiya, Kenichi Meguro, Yasuyuki Okada
  • Publication number: 20080246528
    Abstract: The level shift device of the present invention comprises: a level shift circuit which converts a voltage level of a single input signal; and a duty correcting circuit which offsets a difference in the duty of an output signal of the level shift circuit with respect to the duty of the input signal.
    Type: Application
    Filed: September 4, 2007
    Publication date: October 9, 2008
    Inventors: Hiroshi Inoue, Yorimasa Funahashi, Satoshi Nakashima, Yasuyuki Okada