Patents by Inventor Ryuji Fujii

Ryuji Fujii 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: 20160284370
    Abstract: A thermally assisted magnetic head (TAMH) slider having an air bearing surface and a back surface opposite the air bearing surface, which includes a slider substrate, a magnetic head portion configured on the slider substrate and having a waveguide formed therein, a semiconductor surface emitting laser configured on the back surface with an emitting surface facing the back surface; and a lens configured between the semiconductor surface emitting laser and the waveguide for focusing lights emitted from the semiconductor surface emitting laser on an incident end of the waveguide. The TAMH slider has stable performance, and can rapidly write data to a magnetic recording medium with high recording density.
    Type: Application
    Filed: March 26, 2015
    Publication date: September 29, 2016
    Inventors: Seiichi TAKAYAMA, Takashi HONDA, Yasutoshi FUJITA, Osamu HARAKAWA, Ryuji FUJII
  • Patent number: 9437226
    Abstract: A method of testing a TAMH includes providing a slider body having a waveguide embedded therein with an incidence end extending toward a back surface of the slider body; providing a light source unit including a light source and a unit substrate; coating a bonding material layer on the back surface, under the bottom, or both on the back surface and under the bottom of the unit substrate; coating a localization material layer on the back surface; aligning the light source unit to the slider body; causing a light emitted from the light source and allowed to be incident on the incidence end to anneal the localization material layer to generate an annealing mark; removing the light source unit or the light source from the slider body; and measuring a position offset between the annealing mark and the incidence end. The method can evaluate alignment accuracy of a slider body and a light source unit in two dimensional directions.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: September 6, 2016
    Assignee: SAE MAGNETICS (H.K.) LTD.
    Inventors: Tadatoshi Koba, Seiichi Takayama, Ryuji Fujii, Takashi Honda, Osamu Harakawa, Masahiro Kuribayashi
  • Patent number: 9437227
    Abstract: A thermally assisted magnetic recording head slider includes a light source unit having a light emitting element emitting laser light and a submount holding the light emitting element, and slider including a thin-film laminated part having a main magnetic pole layer, a near-field light generating element and an optical waveguide. A combination of the light emitting element and near-field light generating element is composed of a first pattern or second pattern. The light source unit is mounted on a light source placing surface so that a substrate surface of the light emitting element is orthogonal to a laminated surface of the thin-film laminated part. A plurality of electrode pads are formed on the outer end surface of the slider. The light source unit has a first element electrode and second element electrode.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: September 6, 2016
    Assignee: SAE Magnetic (H.K.) Ltd.
    Inventors: Takashi Honda, Seiichi Takayama, Ryuji Fujii
  • Publication number: 20160232928
    Abstract: A light source unit has a substrate, a light source that is mounted to the substrate. The light source includes; a first emission part that emits a forward light, the forward light being a laser light in an oscillation state; a second emission part that is located on a side opposite to the first emission part and that emits a rearward light, the rearward light being a laser light in an oscillation state; and a light leakage part located at a position different from the first emission part and the second emission part. The light source further includes a photodetector that is provided on the substrate, wherein the photodetector has a light receiving surface for detecting a leakage light that leaks from the light leakage part.
    Type: Application
    Filed: March 13, 2015
    Publication date: August 11, 2016
    Inventors: Takashi HONDA, Seiichi TAKAYAMA, Ryuji FUJII, Koji SHIMAZAWA, Tsuguki NOMA, Yoshiteru NAGAI
  • Patent number: 9275658
    Abstract: A return path section includes first and second yoke portions and first, second and third columnar portions. The first and second yoke portions and the first columnar portion are located on the front side in the direction of travel of a recording medium relative to a waveguide core. The second and third columnar portions are located on opposite sides of a plasmon generator and connected to a shield. The first yoke portion connects a main pole to the first columnar portion. The second yoke portion connects the first columnar portion to the second and third columnar portions. A coil is wound around the first columnar portion. A heater and an expansion layer are located on the rear side in the direction of travel of the recording medium relative to the core.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: March 1, 2016
    Assignees: HEADWAY TECHNOLOGIES, INC., SAE MAGNETICS (H.K.) LTD.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Hironori Araki, Ryuji Fujii
  • Patent number: 9236082
    Abstract: A plasmon generator includes a first portion and a second portion that are adjacent in a first direction orthogonal to the direction of travel of light propagating through a core. The second portion includes a front end face located in a medium facing surface of a magnetic head. The core has a concave portion recessed from the top surface of the core. At least part of the first portion is received in the concave portion. The concave portion has a surface including an evanescent light generating portion. The first portion includes a plasmon exciting portion opposed to the evanescent light generating portion. The evanescent light generating portion is inclined relative to a first surface.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: January 12, 2016
    Assignees: HEADWAY TECHNOLOGIES, INC., SAE MAGNETICS (H.K.) LTD.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Hironori Araki, Hideo Mamiya, Ryuji Fujii
  • Patent number: 9208806
    Abstract: A plasmon generator includes a first portion and a second portion. A core of a waveguide includes a main body portion and a protruding portion. The main body portion has a first surface and a second surface parallel to each other. The protruding portion lies on the first surface. A cladding of the waveguide includes a receiving-portion-forming layer lying on the first surface. At least part of the first portion of the plasmon generator is received in a receiving portion defined by the protruding portion and the receiving-portion-forming layer.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: December 8, 2015
    Assignees: HEADWAY TECHNOLOGIES, INC., SAE MAGNETICS (H.K.) LTD.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Hironori Araki, Hideo Mamiya, Ryuji Fujii
  • Publication number: 20150332717
    Abstract: A thermal assisted magnetic recording head of the present invention has an air bearing surface (ABS) opposite to a magnetic recording medium, a core that can propagate laser light as propagating light, a plasmon generator that includes a generator front end surface facing the ABS, and a main pole that faces the ABS and emits magnetic flux to the magnetic recording medium. The plasmon generator is opposite to a part of the core and extends to the generator front surface, is coupled with a portion of the propagating light that propagates through the core in the surface plasmon mode to generate a surface plasmon, propagates the surface plasmon to the generator front end surface, and generates near-field light (NF light) at the generator front end surface to irradiate the NF light to the magnetic recording medium.
    Type: Application
    Filed: May 14, 2014
    Publication date: November 19, 2015
    Applicants: TDK Corporation, SAE Magnetics (H.K.) Ltd.
    Inventors: Kenta HARA, Kosuke TANAKA, Tetsuya ROPPONGI, Ryuji FUJII, Yasutoshi FUJITA
  • Patent number: 9190084
    Abstract: A thermal assisted magnetic recording head of the present invention has an air bearing surface (ABS) opposite to a magnetic recording medium, a core that can propagate laser light as propagating light, a plasmon generator that includes a generator front end surface facing the ABS, and a main pole that faces the ABS and emits magnetic flux to the magnetic recording medium. The plasmon generator is opposite to a part of the core and extends to the generator front surface, is coupled with a portion of the propagating light that propagates through the core in the surface plasmon mode to generate a surface plasmon, propagates the surface plasmon to the generator front end surface, and generates near-field light (NF light) at the generator front end surface to irradiate the NF light to the magnetic recording medium.
    Type: Grant
    Filed: May 14, 2014
    Date of Patent: November 17, 2015
    Assignees: TDK Corporation, SAE Magnetics (H.K.) Ltd.
    Inventors: Kenta Hara, Kosuke Tanaka, Tetsuya Roppongi, Ryuji Fujii, Yasutoshi Fujita
  • Patent number: 9163939
    Abstract: A method of manufacturing a thermally-assisted magnetic head includes providing a light source unit including a laser diode; providing a reflection board, and a photo detector; driving the laser diode to emit a light beam towards the reflection board; performing an alignment between the light source unit and the thermally-assisted magnetic recording head section, based on a reflected light of the light beam reflected by the reflection board, then passed through the optical waveguide and finally detected by the photo detector obtaining the maximum power in a LED emission state of the laser diode; and bonding the light source unit to the slider after the alignment is completed. It improves alignment accuracy between a light source unit and a slider during a bonding process therebetween, prevents a laser diode of the light source unit instability, and improves performance of the thermally-assisted magnetic head finally.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: October 20, 2015
    Assignee: SAE MAGNETICS (H.K.) LTD.
    Inventors: Seiichi Takayama, Ryuji Fujii, Takashi Honda, Osamu Harakawa, Tadatoshi Koba
  • Publication number: 20150262593
    Abstract: A return path section includes first and second yoke portions and first, second and third columnar portions. The first and second yoke portions and the first columnar portion are located on the front side in the direction of travel of a recording medium relative to a waveguide core. The second and third columnar portions are located on opposite sides of a plasmon generator and connected to a shield. The first yoke portion connects a main pole to the first columnar portion. The second yoke portion connects the first columnar portion to the second and third columnar portions. A coil is wound around the first columnar portion. A heater and an expansion layer are located on the rear side in the direction of travel of the recording medium relative to the core.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 17, 2015
    Applicants: SAE MAGNETICS (H.K.) LTD., HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka SASAKI, Hiroyuki ITO, Shigeki TANEMURA, Kazuki SATO, Hironori ARAKI, Ryuji FUJII
  • Publication number: 20150255096
    Abstract: A plasmon generator includes a first portion and a second portion. A core of a waveguide includes a main body portion and a protruding portion. The main body portion has a first surface and a second surface parallel to each other. The protruding portion lies on the first surface. A cladding of the waveguide includes a receiving-portion-forming layer lying on the first surface. At least part of the first portion of the plasmon generator is received in a receiving portion defined by the protruding portion and the receiving-portion-forming layer.
    Type: Application
    Filed: March 10, 2014
    Publication date: September 10, 2015
    Applicants: SAE MAGNETICS (H.K.) LTD., HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka SASAKI, Hiroyuki ITO, Shigeki TANEMURA, Hironori ARAKI, Hideo MAMIYA, Ryuji FUJII
  • Publication number: 20150247722
    Abstract: A method of manufacturing a thermally-assisted magnetic head includes providing a light source unit including a laser diode; providing a reflection board, and a photo detector; driving the laser diode to emit a light beam towards the reflection board; performing an alignment between the light source unit and the thermally-assisted magnetic recording head section, based on a reflected light of the light beam reflected by the reflection board, then passed through the optical waveguide and finally detected by the photo detector obtaining the maximum power in a LED emission state of the laser diode; and bonding the light source unit to the slider after the alignment is completed. It improves alignment accuracy between a light source unit and a slider during a bonding process therebetween, prevents a laser diode of the light source unit instability, and improves performance of the thermally-assisted magnetic head finally.
    Type: Application
    Filed: February 28, 2014
    Publication date: September 3, 2015
    Applicant: SAE Magnetics (H.K.) Ltd.
    Inventors: Seiichi TAKAYAMA, Ryuji FUJII, Takashi HONDA, Osamu HARAKAWA, Tadatoshi KOBA
  • Publication number: 20150124575
    Abstract: A plasmon generator includes a first portion and a second portion that are adjacent in a first direction orthogonal to the direction of travel of light propagating through a core. The second portion includes a front end face located in a medium facing surface of a magnetic head. The core has a concave portion recessed from the top surface of the core. At least part of the first portion is received in the concave portion. The concave portion has a surface including an evanescent light generating portion. The first portion includes a plasmon exciting portion opposed to the evanescent light generating portion. The evanescent light generating portion is inclined relative to a first surface.
    Type: Application
    Filed: November 1, 2013
    Publication date: May 7, 2015
    Applicants: SAE MAGNETICS (H.K.) LTD., HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka SASAKI, Hiroyuki ITO, Shigeki TANEMURA, Hironori ARAKI, Hideo MAMIYA, Ryuji FUJII
  • Patent number: 9013964
    Abstract: A return path section includes first and second yoke portions and first, second and third columnar portions. The first and second yoke portions and the first columnar portion are located on the same side in the direction of travel of the recording medium relative to a wave guide core. The second and third columnar portions are located on opposite sides of a plasmon generator and connected to a shield. The first yoke portion connects a main pole to the first columnar portion. The second yoke portion connects the first columnar portion to the second and third columnar portions. A coil is wound around the first columnar portion.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: April 21, 2015
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Hironori Araki, Ryuji Fujii
  • Publication number: 20150085629
    Abstract: A thermally assisted magnetic head includes a main magnetic pole layer, a near-field light generating layer having a generating end part generating near-field light arranged within a medium-opposing surface, and an optical waveguide guiding light to the near-field light generating layer. The near-field light generating layer has a laminated structure in which a first thin-film metal layer formed in a thin film form along a direction intersecting the medium-opposing surface and a second thin-film metal layer formed in a thin film form and formed using a second metal larger in hardness than a first metal forming the first thin-film metal layer are alternately laminated. Further, in the second thin-film metal layer, a defect part is formed, the defect part is a part smaller in thickness than another part or is a hole part, and a flat layer part other than the defect part surrounds the defect part.
    Type: Application
    Filed: September 24, 2013
    Publication date: March 26, 2015
    Applicants: SAE MAGNETICS (H.K.) LTD., HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka SASAKI, Hiroyuki ITO, Hironori ARAKI, Shigeki TANEMURA, Kazuki SATO, Ryuji FUJII
  • Patent number: 8988975
    Abstract: A thermally assisted magnetic head includes a main magnetic pole layer, a near-field light generating layer having a generating end part generating near-field light arranged within a medium-opposing surface, and an optical waveguide guiding light to the near-field light generating layer. The near-field light generating layer has a laminated structure in which a first thin-film metal layer formed in a thin film form along a direction intersecting the medium-opposing surface and a second thin-film metal layer formed in a thin film form and formed using a second metal larger in hardness than a first metal forming the first thin-film metal layer are alternately laminated. Further, in the second thin-film metal layer, a defect part is formed, the defect part is a part smaller in thickness than another part or is a hole part, and a flat layer part other than the defect part surrounds the defect part.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: March 24, 2015
    Assignees: Headyway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Hironori Araki, Shigeki Tanemura, Kazuki Sato, Ryuji Fujii
  • Publication number: 20150071044
    Abstract: A return path section includes first and second yoke portions and first, second and third columnar portions. The first and second yoke portions and the first columnar portion are located on the same side in the direction of travel of the recording medium relative to a wave guide core. The second and third columnar portions are located on opposite sides of a plasmon generator and connected to a shield. The first yoke portion connects a main pole to the first columnar portion. The second yoke portion connects the first columnar portion to the second and third columnar portions. A coil is wound around the first columnar portion.
    Type: Application
    Filed: September 9, 2013
    Publication date: March 12, 2015
    Inventors: Yoshitaka SASAKI, Hiroyuki ITO, Shigeki TANEMURA, Kazuki SATO, Hironori ARAKI, Ryuji FUJII
  • Patent number: 8912042
    Abstract: In a manufacturing method for layered chip packages, a layered substructure with at least one additional package joined thereto is used to produce a plurality of layered chip packages. The layered substructure includes a plurality of main bodies to be separated from each other later. Each main body includes: a main part having top and bottom surfaces and including a plurality of layer portions stacked on each other; and a plurality of main terminals disposed on at least one of the top and bottom surfaces of the main part. The additional package includes an additional semiconductor chip and at least one additional terminal that is electrically connected to the additional semiconductor chip and in contact with at least one of the plurality of main terminals.
    Type: Grant
    Filed: September 17, 2012
    Date of Patent: December 16, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Atsushi Iijima, Ryuji Fujii
  • Patent number: 8902546
    Abstract: A head stack assembly includes a mounting base, a plurality of drive arms connected with the mounting base, and multiple pairs of head gimbal assemblies connected with the drive arms. Each head gimbal assembly includes a thermal assisted magnetic head, the thermal assisted magnetic head has an air bearing surface, a bottom surface opposite to the air bearing surface, and a laser diode module mounted on the bottom surface and adapted to emit a downward laser light to a write element of the thermal assisted magnetic head and an upward laser light, wherein a light shielding structure is provided to prevent the upward laser light emitting to other laser diode modules to generate light coupling, thereby improving thermal stability of the thermal assisted magnetic head.
    Type: Grant
    Filed: August 15, 2013
    Date of Patent: December 2, 2014
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Seiichi Takayama, Hideki Tanzawa, Osamu Harakawa, Takashi Honda, Ryuji Fujii