Patents by Inventor Kazuhiko Hosomi

Kazuhiko Hosomi 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).

  • Patent number: 9390733
    Abstract: In one embodiment, a magnetic head includes a main pole configured to emit a recording magnetic field for affecting a magnetic medium, the main pole configured to serve as a first electrode and having a front portion at an air bearing surface (ABS) of the magnetic head and a rear portion extending from the front portion in an element height direction perpendicular to the ABS, wherein an upper surface of the front portion of the main pole is angled with respect to a plane of deposition at a first angle of inclination of greater than 0°, and wherein at least a portion of an upper surface of the rear portion of the main pole is angled at a first angle of declination greater than 0° with respect to the plane of deposition, an upper shield positioned above the main pole, the upper shield configured to serve as a second electrode, and a microwave oscillator positioned between the main pole and the upper shield at the ABS.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: July 12, 2016
    Assignee: HGST Netherlans B.V.
    Inventors: Kimitoshi Etoh, Kazuhiko Hosomi, Mikito Sugiyama, Tomohiro Okada
  • Patent number: 9230573
    Abstract: A magnetic write head having a write pole with a tapered trailing edge and a magnetic oscillator formed on the trailing edge of the write pole. The magnetic oscillator is sandwiched between the magnetic write pole and a trailing magnetic shield. The write head also includes a non-magnetic, electrically conductive bump structure located over a back portion of the magnetic oscillator between the magnetic oscillator and the trailing magnetic shield. The presence of the non-magnetic, electrically conductive bump structure causes electrons to properly flow through the magnetic oscillator in a direction that is generally perpendicular to the plane of the magnetic oscillator, even when the magnetic oscillator is formed on an inclined plane on the tapered trailing edge of the write pole. This thereby ensures optimal performance of the magnetic oscillator.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: January 5, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Kimitoshi Etoh, Kenji Sugiura, Mikito Sugiyama, Yohji Maruyama, Kazuhiko Hosomi, Katsuro Watanabe
  • Patent number: 9142227
    Abstract: A microwave-assisted magnetic recording (MAMR) write head includes a yoke structure with a main pole, a flux return pole, and a trailing magnetic shield. The main pole includes a write pole with a tip at the disk-facing surface, a sub pole with an end recessed from the disk-facing surface and an electrically insulating layer between the write pole and the sub pole. The spin-torque oscillator (STO) is located at the disk-facing surface between the trailing shield and the write pole tip. The insulating layer assures that the STO current is not shorted between the return pole and the write pole. The insulating layer between the write pole and the sub pole increases the area of the junction between the return pole and write pole, which reduces the magnetic reluctance of the yoke structure.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: September 22, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Kimitoshi Etoh, Masahiko Hatatani, Kazuhiko Hosomi, Yohji Maruyama, Kenji Sugiura, Mikito Sugiyama
  • Patent number: 9076462
    Abstract: In one embodiment, a magnetic head includes a main pole configured to write data to a magnetic medium using a magnetic field, a return pole positioned above the main pole at a media-facing surface of the magnetic head, the return pole being configured to return magnetic flux from the main pole after it has exited a magnetic medium, and a coil configured to produce magnetic flux in the main pole, the coil being positioned below the return pole, wherein a film thickness of a first turn of the coil on a media-facing surface side thereof is less than a film thickness of a second turn of the coil. Other magnetic heads having a shortened magnetic circuit length and methods of production thereof are presented in additional embodiments.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: July 7, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Kimitoshi Etoh, Kazuhiko Hosomi, Mikito Sugiyama, Yohji Maruyama
  • Publication number: 20150154987
    Abstract: In one embodiment, a magnetic head includes a main pole configured to write data to a magnetic medium using a magnetic field, a return pole positioned above the main pole at a media-facing surface of the magnetic head, the return pole being configured to return magnetic flux from the main pole after it has exited a magnetic medium, and a coil configured to produce magnetic flux in the main pole, the coil being positioned below the return pole, wherein a film thickness of a first turn of the coil on a media-facing surface side thereof is less than a film thickness of a second turn of the coil. Other magnetic heads having a shortened magnetic circuit length and methods of production thereof are presented in additional embodiments.
    Type: Application
    Filed: December 3, 2013
    Publication date: June 4, 2015
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Kimitoshi Etoh, Kazuhiko Hosomi, Mikito Sugiyama, Yohji Maruyama
  • Publication number: 20150103434
    Abstract: In one embodiment, a magnetic head includes a main pole configured to emit a recording magnetic field for affecting a magnetic medium, the main pole configured to serve as a first electrode and having a front portion at an air bearing surface (ABS) of the magnetic head and a rear portion extending from the front portion in an element height direction perpendicular to the ABS, wherein an upper surface of the front portion of the main pole is angled with respect to a plane of deposition at a first angle of inclination of greater than 0°, and wherein at least a portion of an upper surface of the rear portion of the main pole is angled at a first angle of declination greater than 0° with respect to the plane of deposition, an upper shield positioned above the main pole, the upper shield configured to serve as a second electrode, and a microwave oscillator positioned between the main pole and the upper shield at the ABS.
    Type: Application
    Filed: October 10, 2013
    Publication date: April 16, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Kimitoshi Etoh, Kazuhiko Hosomi, Mikito Sugiyama, Tomohiro Okada
  • Patent number: 8964331
    Abstract: A magnetic write head having a main magnetic write pole and a magnetic sub-pole that are configured to maximize magnetic performance. The main magnetic write pole has a flared portion located near the air bearing surface and a non-flared portion removed from the air bearing surface. A magnetic sub-pole is formed adjacent to the main magnetic write pole and terminates at a front endpoint that is recessed from the air bearing surface but is closer to the air bearing surface than the non-flared portion.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: February 24, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Mikito Sugiyama, Kazuhiko Hosomi, Kaori Suzuki
  • Patent number: 8965153
    Abstract: A core of an optical waveguide and a core of a waveguide type optical device are adjacently disposed, and a layer is continuously formed at one end of the core of the waveguide type optical device, wherein an effective refractive index of the layer decreases toward a long axis direction of the optical waveguide stripe.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: February 24, 2015
    Assignee: Hitachi Ltd.
    Inventors: Makoto Takahashi, Hideo Arimoto, Kazuhiko Hosomi, Toshihiko Fukamachi, Shigeki Makino, Yasunobu Matsuoka, Toshiki Sugawara
  • Patent number: 8941948
    Abstract: In one embodiment, a perpendicular magnetic recording head includes a main magnetic pole; a leading shield below a leading side of the main magnetic pole; a leading gap between the leading shield and the main magnetic pole; a trailing shield above a trailing side of the main magnetic pole; a trailing gap between the trailing shield and the main magnetic pole; and a nonmagnetic leading bump between the main magnetic pole and the leading shield. Additional embodiments are also disclosed.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: January 27, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Kimitoshi Etoh, Mikito Sugiyama, Hisashi Kimura, Kazuhiko Hosomi
  • Patent number: 8837088
    Abstract: In one embodiment, a magnetic head includes a main pole configured to emit a recording magnetic field for affecting a magnetic medium, the main pole serving as a first electrode and having a front portion at an air bearing surface (ABS) of the magnetic head and a rear portion extending from the front portion in an element height direction perpendicular to the ABS, wherein an upper surface of the main pole has a step transitioning from the front portion to the rear portion, a conductive layer positioned above the main pole, the conductive layer serving as a second electrode, a microwave oscillator positioned between the main pole and the conductive layer at the ABS of the Magnetic head and extending beyond the step in the element height direction, and a current confinement layer positioned between the microwave oscillator and the rear portion of the main pole.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: September 16, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Hisashi Kimura, Kazuhiko Hosomi, Kimitoshi Etoh, Mikito Sugiyama
  • Patent number: 8824103
    Abstract: The strength of a magnetic field applied from a main pole to an oscillator and the strength of a magnetic field applied from the main pole to a recording medium are improved in a magnetic recording head for microwave assisted recording. In the magnetic recording head according to the present invention, an interval between the main pole and a trailing shield at a place in a position above an air bearing surface is larger than an interval between the main pole and the trailing shield on the air bearing surface.
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: September 2, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masato Shiimoto, Kenji Sugiura, Mikito Sugiyama, Isao Nunokawa, Yo Sato, Katsuro Watanabe, Kazuhiko Hosomi, Nobuo Yoshida
  • Publication number: 20130342937
    Abstract: A magnetic write head having a main magnetic write pole and a magnetic sub-pole that are configured to maximize magnetic performance. The main magnetic write pole has a flared portion located near the air bearing surface and a non-flared portion removed from the air bearing surface. A magnetic sub-pole is formed adjacent to the main magnetic write pole and terminates at a front endpoint that is recessed from the air bearing surface but is closer to the air bearing surface than the non-flared portion.
    Type: Application
    Filed: June 21, 2012
    Publication date: December 26, 2013
    Applicant: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
    Inventors: Mikito Sugiyama, Kazuhiko Hosomi, Kaori Suzuki
  • Publication number: 20130335854
    Abstract: In one embodiment, a perpendicular magnetic recording head includes a main magnetic pole; a leading shield below a leading side of the main magnetic pole; a leading gap between the leading shield and the main magnetic pole; a trailing shield above a trailing side of the main magnetic pole; a trailing gap between the trailing shield and the main magnetic pole; and a nonmagnetic leading bump between the main magnetic pole and the leading shield. Additional embodiments are also disclosed.
    Type: Application
    Filed: June 18, 2012
    Publication date: December 19, 2013
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Kimitoshi Etoh, Mikito Sugiyama, Hisashi Kimura, Kazuhiko Hosomi
  • Patent number: 8570686
    Abstract: A magnetic write head having a shield structure that provides both a leading shield and side shielding function. The magnetic shield is separated from the sides and leading edge of the write pole by a non-magnetic gap layer that has a non-uniform thickness. The non-magnetic gap layer is thicker near the leading edge and thinner at the trailing edge. This allows for increased side field gradient near the trailing edge of the write pole and decreased write field loss at the leading edge of the write pole.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: October 29, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Kazuhiko Hosomi, Kimitoshi Eto, Mikito Sugiyama, Junichi Hashimoto, Kazue Kudo, Misuzu Kanai
  • Publication number: 20130242431
    Abstract: A magnetic write head having a shield structure that provides both a leading shield and side shielding function. The magnetic shield is separated from the sides and leading edge of the write pole by a non-magnetic gap layer that has a non-uniform thickness. The non-magnetic gap layer is thicker near the leading edge and thinner at the trailing edge. This allows for increased side field gradient near the trailing edge of the write pole and decreased write field loss at the leading edge of the write pole.
    Type: Application
    Filed: March 13, 2012
    Publication date: September 19, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Kazuhiko Hosomi, Kimitoshi Eto, Mikito Sugiyama, Junichi Hashimoto, Kazue Kudo, Misuzu Kanai
  • Patent number: 8472135
    Abstract: According to one embodiment, a high-frequency magnetic field-assisted magnetic recording head includes a main pole adapted for producing a writing magnetic field, a STO positioned above the main pole, a low-resistance layer positioned above the STO, and a current confinement layer positioned between the low-resistance layer and the main pole, wherein the main pole and the low-resistance layer are adapted for acting as poles for writing data to a magnetic medium in response to a flow of current to the STO positioned therebetween to generate a high-frequency magnetic field which overlaps with the writing magnetic field, and wherein the current confinement layer is adapted for controlling a current density and/or a current density distribution of the current flowing to the STO. Other magnetic recording heads and methods of production thereof are also described according to more embodiments.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: June 25, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Kikuo Kusukawa, Masato Shiimoto, Kazuhiko Hosomi, Katsuro Watanabe
  • Publication number: 20130057980
    Abstract: The strength of a magnetic field applied from a main pole to an oscillator and the strength of a magnetic field applied from the main pole to a recording medium are improved in a magnetic recording head for microwave assisted recording. In the magnetic recording head according to the present invention, an interval between the main pole and a trailing shield at a place in a position above an air bearing surface is larger than an interval between the main pole and the trailing shield on the air bearing surface.
    Type: Application
    Filed: February 24, 2012
    Publication date: March 7, 2013
    Inventors: Masato SHIIMOTO, Kenji SUGIURA, Mikito SUGIYAMA, Isao NUNOKAWA, Yo SATO, Katsuro WATANABE, Kazuhiko HOSOMI, Nobuo YOSHIDA
  • Patent number: 8303195
    Abstract: The optical module includes an optical device mounting substrate 1 and an optical multiplexer/demultiplexer 2. One laser diode and at least one photodetector, which are positioned in the same plane, are mounted on the optical device mounting substrate 1. The optical multiplexer/demultiplexer is prepared by mounting a wavelength-selective filter and a mirror on the front and back surfaces of a transparent substrate. The optical device mounting substrate and the optical multiplexer/demultiplexer are mounted in a package 3 in such a manner that the optical device mounting surface and the filter surface are not parallel to each other. The optical module also includes a first lens, which is positioned near the laser diode or monolithically integrated with the laser diode, and a second lens, which converges light coming out of the optical multiplexer/demultiplexer toward an optical fiber.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: November 6, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Koichiro Adachi, Kazuhiko Hosomi, Toshiki Sugawara
  • Patent number: 8036533
    Abstract: An optical element mounting substrate where a plurality of light emitting elements have been mounted on the same plane, a lens array for collimating a plurality of light emitted from the plurality of light emitting elements, and a wavelength multiplexing/demultiplexing device are prepared. The wavelength multiplexing/demultiplexing device has typically mounted both a wavelength selecting filter and a mirror on front and rear planes of a transparent substrate. These three components are mounted within a package at a desirable angle position. Optical axes of respective wavelengths of the wavelength multiplexing/demultiplexing device are determined based upon a thickness and an angle of the light emitting element mounting substrate, and are arrayed on a straight line of a horizontal plane. As a consequence, if the respective light emitting elements are arranged on the optical axes which are exclusively determined by a design work, then optical multiplexing/demultiplexing operations can be carried out.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: October 11, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Hosomi, Misuzu Sagawa, Toshiki Sugawara, Masahiro Aoki
  • Publication number: 20100278482
    Abstract: The optical module includes an optical device mounting substrate 1 and an optical multiplexer/demultiplexer 2. One laser diode and at least one photodetector, which are positioned in the same plane, are mounted on the optical device mounting substrate 1. The optical multiplexer/demultiplexer is prepared by mounting a wavelength-selective filter and a mirror on the front and back surfaces of a transparent substrate. The optical device mounting substrate and the optical multiplexer/demultiplexer are mounted in a package 3 in such a manner that the optical device mounting surface and the filter surface are not parallel to each other. The optical module also includes a first lens, which is positioned near the laser diode or monolithically integrated with the laser diode, and a second lens, which converges light coming out of the optical multiplexer/demultiplexer toward an optical fiber.
    Type: Application
    Filed: December 15, 2008
    Publication date: November 4, 2010
    Applicant: Hitachi, Ltd.
    Inventors: Koichiro Adachi, Kazuhiko Hosomi, Toshiki Sugawara