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).

  • Patent number: 11492981
    Abstract: A fuel control device includes a combustion temperature estimation value calculation unit that calculates a temperature estimation value when a mixture of fuel and inflow air is burned using an atmospheric condition, an opening degree command value of a valve that controls the amount of air that is mixed with the fuel and burned, and an output prediction value calculated on the basis of a fuel control signal command value used for calculation of a total fuel flow rate flowing through a plurality of fuel supply systems, a fuel distribution command value calculation unit that calculates a fuel distribution command value indicating a distribution of fuel output from the fuel supply systems based on the temperature estimation value, and outputs the fuel distribution command value, and a valve opening degree calculation unit that calculates each valve opening degree of a fuel flow rate control valve of the fuel supply systems.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: November 8, 2022
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Keisuke Yamamoto, Takashi Sonoda, Akihiko Saito, Fuminori Fujii, Hisashi Nakahara, Ryoichi Haga, Ryuji Takenaka, Yoshifumi Iwasaki, Wataru Akizuki, Isamu Matsumi, Naohiro Sumimura, Shinichi Yoshioka
  • Publication number: 20220311217
    Abstract: A semiconductor laser includes an active layer which emits laser light and cladding layers being formed so as to sandwich the active layer. The active layer includes a quantum dot layer including a plurality of quantum dots, which respectively confine movements of carriers in the three-dimensional directions. The laser radar device includes a light projection part which projects laser light and a light receiving part which receives reflected light of the laser light. The light projection part includes the semiconductor laser and a scanner which reflects the laser light, emitted from the semiconductor laser, to form a scanning laser light.
    Type: Application
    Filed: March 25, 2021
    Publication date: September 29, 2022
    Inventors: Seiichi Takayama, Kang Gao, Ryo Hosoi, Ryuji Fujii
  • Patent number: 11127424
    Abstract: A light source-unit includes a laser diode, a sub-mount which the laser diode is joined. The laser diode includes an optical generating layer including an active layer which emits laser-light and cladding layers being formed so as to sandwich the active layer. The active layer includes a quantum dot layer including a plurality of quantum dots, which respectively confine movements of carriers in the three-dimensional directions.
    Type: Grant
    Filed: November 17, 2020
    Date of Patent: September 21, 2021
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Kang Gao, Seiichi Takayama, Ryo Hosoi, Ryuji Fujii
  • Patent number: 10811042
    Abstract: A thermally assisted magnetic recording head and a thermally assisted magnetic recording disk drive are disclosed. The thermally assisted magnetic recording head includes a slider body, a laser substrate, a laser and a magnetic head, wherein the laser substrate is provided on the slider body, the laser is provided on the laser substrate, and the magnetic head is provided at a front end of the slider body. The magnetic head includes an optical waveguide facing the laser. The angle between a light incident surface of the optical waveguide and an incident direction of a laser light incident on the optical waveguide is less than 90 degrees. The thermally assisted magnetic recording disk drive includes a plurality of magnetic disks and a magnetic head suspending frame. A front end of the magnetic head suspending frame is provided with the thermally assisted magnetic recording heads mentioned above.
    Type: Grant
    Filed: December 24, 2018
    Date of Patent: October 20, 2020
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Ryuji Fujii, Jian Hui Huang, Natsuo Nishijima, Lin Huang, Shi Xiong Chen, Bin Qi, Wen Rong Guo
  • Publication number: 20200143827
    Abstract: A thermally assisted magnetic recording head and a thermally assisted magnetic recording disk drive are disclosed. The thermally assisted magnetic recording head includes a slider body, a laser substrate, a laser and a magnetic head, wherein the laser substrate is provided on the slider body, the laser is provided on the laser substrate, and the magnetic head is provided at a front end of the slider body. The magnetic head includes an optical waveguide facing the laser. The angle between a light incident surface of the optical waveguide and an incident direction of a laser light incident on the optical waveguide is less than 90 degrees. The thermally assisted magnetic recording disk drive includes a plurality of magnetic disks and a magnetic head suspending frame. A front end of the magnetic head suspending frame is provided with the thermally assisted magnetic recording heads mentioned above.
    Type: Application
    Filed: December 24, 2018
    Publication date: May 7, 2020
    Inventors: Ryuji Fujii, Jian Hui Huang, Natsuo Nishijima, Lin Huang, Shi Xiong Chen, Bin Qi, Wen Rong Guo
  • Patent number: 10490212
    Abstract: A row bar for forming magnetic heads includes a row of magnetic head forming portions each having a magnetic head and a cutting portion adjacent to the magnetic heads. A row of bonding pads and a first ELG pad are provided at the magnetic head, a second ELG pad is provided at the cutting portion, both of the first and the second ELG pads are adapted for contacting with a probe during lapping process, and a conductive structure that is higher than surfaces of the first and the second ELG pads is formed at peripheries of the first and the second ELG pads respectively. Due to the conductive structures, a probe used in lapping process will be prevented from shifting from the ELG pads to ensure a stable contact, thereby obtaining efficient and accurate resistance measurement.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: November 26, 2019
    Assignee: SAE MAGNETICS (H.K.) LTD.
    Inventors: Ryuji Fujii, Shi Xiong Chen, Long Ping Wang, Zeng Hui Zhang
  • Patent number: 10311903
    Abstract: A method of testing dynamic performances for a slider body of a thermally-assisted magnetic head includes: providing a slider body which is disconnected with a light source unit; removably mounting the slider body to a test head suspension assembly; keeping to provide a flat top beam to the slider body, the flat top beam being aligned with the optical waveguide, and a projection of an incident end of the optical waveguide being located within a light spot of the flat top beam; and testing the dynamic performance of the slider body. It can save the material cost and labor cost, and eliminate a precise optical alignment between an input light and an optical waveguide in the slider body to improve testing efficiency.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: June 4, 2019
    Assignee: SAE MAGNETICS (H.K.) LTD.
    Inventors: Seiichi Takayama, Takashi Honda, Ryuji Fujii, Ryo Hosoi, Kaichiu Cheung, Tsutomu Sasaki, Jingtao Lu, Fanglong Nie
  • Publication number: 20190005980
    Abstract: A method of testing dynamic performances for a slider body of a thermally-assisted magnetic head includes: providing a slider body which is disconnected with a light source unit; removably mounting the slider body to a test head suspension assembly; keeping to provide a flat top beam to the slider body, the flat top beam being aligned with the optical waveguide, and a projection of an incident end of the optical waveguide being located within a light spot of the flat top beam; and testing the dynamic performance of the slider body. It can save the material cost and labor cost, and eliminate a precise optical alignment between an input light and an optical waveguide in the slider body to improve testing efficiency.
    Type: Application
    Filed: July 14, 2017
    Publication date: January 3, 2019
    Inventors: Seiichi TAKAYAMA, Takashi HONDA, Ryuji FUJII, Ryo HOSOI, Kaichiu CHEUNG, Tsutomu SASAKI, Jingtao LU, Fanglong NIE
  • Publication number: 20180246278
    Abstract: A coupling structure of optical components has a first optical component, a second optical component and a coupling solder layer. The first optical component has a lensed fiber, a first holder holding the lensed fiber and a first metal layer formed on a first connecting end face of the first holder. The second optical component has a waveguide, a second holder holding the waveguide and a second metal layer formed on a second connecting end face of the second holder. The coupling solder layer is in direct contact with both of the first metal layer and the second metal layer, and formed with solder.
    Type: Application
    Filed: February 28, 2017
    Publication date: August 30, 2018
    Inventors: Seiichi TAKAYAMA, Kiyohiko ABE, Ryuji FUJII, Takashi HONDA, Shi Xiong CHEN, Osamu HARAKAWA
  • Patent number: 10061084
    Abstract: A coupling structure of optical components has a first optical component, a second optical component and a coupling solder layer. The first optical component has a lensed fiber, a first holder holding the lensed fiber and a first metal layer formed on a first connecting end face of the first holder. The second optical component has a waveguide, a second holder holding the waveguide and a second metal layer formed on a second connecting end face of the second holder. The coupling solder layer is in direct contact with both of the first metal layer and the second metal layer, and formed with solder.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: August 28, 2018
    Assignee: SAE MAGNETICS (H.K.) LTD.
    Inventors: Seiichi Takayama, Kiyohiko Abe, Ryuji Fujii, Takashi Honda, Shi Xiong Chen, Osamu Harakawa
  • Publication number: 20180025744
    Abstract: A row bar for forming magnetic heads includes a row of magnetic head forming portions each having a magnetic head and a cutting portion adjacent to the magnetic heads. A row of bonding pads and a first ELG pad are provided at the magnetic head, a second ELG pad is provided at the cutting portion, both of the first and the second ELG pads are adapted for contacting with a probe during lapping process, and a conductive structure that is higher than surfaces of the first and the second ELG pads is formed at peripheries of the first and the second ELG pads respectively. Due to the conductive structures, a probe used in lapping process will be prevented from shifting from the ELG pads to ensure a stable contact, thereby obtaining efficient and accurate resistance measurement.
    Type: Application
    Filed: July 19, 2017
    Publication date: January 25, 2018
    Inventors: Ryuji FUJII, Shi Xiong CHEN, Long Ping WANG, Zeng Hui ZHANG
  • Patent number: 9840767
    Abstract: A manufacturing method for a head slider coated with Diamond-like Carbon (DLC) includes: providing a substrate that is to be finally made into a head slider; depositing a DLC layer on a surface of the substrate, with carbon plasma source being sputtered in a direction that is vertical to the surface of the substrate; and doping a fluorine-doping (F-doping) layer on the DLC layer. Whereby the head slider has good film adhesion performance, higher hardness, better wear resistance, lower surface energy to obtain good hydrophobicity and oleophobicity, and lower fly height in HDD.
    Type: Grant
    Filed: April 4, 2016
    Date of Patent: December 12, 2017
    Assignee: SAE MAGNETICS (H.K.) LTD.
    Inventors: Jian Hui Huang, Xiao Ke Ding, Hong Tao Ma, Ryuji Fujii, Da Yao He, De Jin Fan
  • Publication number: 20170283939
    Abstract: A manufacturing method for a head slider coated with Diamond-like Carbon (DLC) includes: providing a substrate that is to be finally made into a head slider; depositing a DLC layer on a surface of the substrate, with carbon plasma source being sputtered in a direction that is vertical to the surface of the substrate; and doping a fluorine-doping (F-doping) layer on the DLC layer. Whereby the head slider has good film adhesion performance, higher hardness, better wear resistance, lower surface energy to obtain good hydrophobicity and oleophobicity, and lower fly height in HDD.
    Type: Application
    Filed: April 4, 2016
    Publication date: October 5, 2017
    Inventors: Jian Hui HUANG, Xiao Ke DING, Hong Tao MA, Ryuji FUJII, Da Yao HE, De Jin FAN
  • Patent number: 9666218
    Abstract: A thermal assisted magnetic recording head has a magnetic head slider and a light source unit that is fixed to the magnetic head slider. A first surface of the light source unit and a second surface of the magnetic head slider face each other via a gap. The light source unit includes a light source that emits laser light from an emission part that is positioned on the first surface and a photodetector that detects the laser light. The magnetic head slider includes a waveguide through which the laser light that is incident on an incident part positioned on the second surface propagates, near-field light generation means for generating near-field light on an air bearing surface, the near-field light being generated from the laser light that propagates through the waveguide, and a recording magnetic pole that is provided adjacent to the near-field light generation means and that has an end part positioned on the air bearing surface.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: May 30, 2017
    Assignee: SAE MAGNETICS (H.K.) LTD.
    Inventors: Takashi Honda, Seiichi Takayama, Ryuji Fujii
  • Patent number: 9489972
    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: Grant
    Filed: March 13, 2015
    Date of Patent: November 8, 2016
    Assignees: SAE MAGNETICS (H.K.) LTD., TDK CORPORATION, ROHM CO., LTD.
    Inventors: Takashi Honda, Seiichi Takayama, Ryuji Fujii, Koji Shimazawa, Tsuguki Noma, Yoshiteru Nagai
  • 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