Patents by Inventor Junichiro Shimizu

Junichiro Shimizu 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: 10993889
    Abstract: A polyaryletherketone resin material is provided for dental use having high color tone stability in the case of exposure to visible light. The polyaryletherketone resin material for dental use includes a polyaryletherketone resin, which is a thermoplastic resin containing at least an aromatic group, an ether group (ether bond), and a ketone group (ketone bond) in its structural unit, and having a b* value of 10.0 or more in terms of colorimetric value of a 1.0 mm molded body in a CIELab color system under a black background condition.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: May 4, 2021
    Inventors: Tomonao Shimizu, Junichiro Yamagawa, Yuko Nagasawa
  • Publication number: 20210114712
    Abstract: The method for producing an assembly is a method for producing an assembly equipped with a member to be reinforced (20), a reinforcing member body (41), and a filler (42), wherein the reinforcing member body (41) has a pair of flanges (44) arranged spaced on the surface (20B) of the member to be reinforced (20), a web (45), and a connection portion (46) which connects the flanges (44) and the web (45) and forms a filler space (V) with the surface (20B). The method for producing an assembly includes a step for inserting a filler (42) into the filler space (V), a step for attaching a crack control member (43) to cover the end of the filler (42), a step for joining the flanges (44) and the member to be reinforced (20), and a step for curing at least the member to be reinforced (20).
    Type: Application
    Filed: November 26, 2018
    Publication date: April 22, 2021
    Inventors: Akihito SUZUKI, Kenji MURAKAMI, Kana SAKON, Akihisa OKUDA, Takayuki SHIMIZU, Takumi SHINOHARA, Jun ETO, Yukifumi TOYAMA, Junichiro MIYAGAKI, Kenichi KAWAKAMI
  • Publication number: 20190165541
    Abstract: A laser element and a modulator element respectively include first and second mesa portions provided to be connected above a substrate. The first and second mesa portions are formed using individual mask films (dielectric masks). In the first mesa portion, a p-type first clad layer not containing Al as the uppermost layer thereof covers the upper surface and each of the side surfaces of a multi-layer body (including an n-type optical guide layer, an active layer, a p-type optical guide layer, and a p-type semiconductor layer). In the first mesa portion, the multi-layer body including the semiconductor layers containing Al is covered with the p-type first clad layer not containing Al. This can prevent unneeded aluminum oxide from being generated and improve the crystallinities of the constituent layers of the second mesa portion. It is possible to maintain excellent optical coupling between the first and second mesa portions.
    Type: Application
    Filed: October 3, 2018
    Publication date: May 30, 2019
    Inventors: Isao WATANABE, Masahide KOBAYASHI, Junichiro SHIMIZU
  • Patent number: 9007722
    Abstract: To uniformly determine the positional relationship between a main magnetic pole and a spin torque oscillator while independently optimizing the main magnetic pole and the spin torque oscillator. On a trailing end surface of a main magnetic pole, a step is provided at the boundary between the main magnetic pole and a gap material disposed on both sides thereof, and a spin torque oscillator is formed on the step. The spin torque oscillator is effectively separated into two regions by utilizing the step. Further, a part of the spin torque oscillator is removed so as to disable the unwanted region, thereby realizing a self-alignment type high frequency magnetic field assisted magnetic recording head structure such that the positions of the end portions of the main magnetic pole and the spin torque oscillator are aligned.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: April 14, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Junichiro Shimizu, Kikuo Kusukawa, Yo Sato, Masukazu Igarashi
  • Patent number: 9001465
    Abstract: Embodiments of the present invention generally relate to a MAMR head. The MAMR head includes an STO. The STO has a first surface at a media facing surface, a second surface that is opposite the first surface and a third surface adjacent to the first and second surfaces. The first and third surfaces form a first acute angle and the second and third surfaces form a second acute angle, where the second acute angle is less than or equal to the first acute angle. Having this configuration, the electrical current going through the STO is substantially perpendicular to the STO, which causes the spin torque to be maximized.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: April 7, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Junichiro Shimizu, Masukaza Igarashi
  • Patent number: 8917481
    Abstract: Provided are a structure of a high frequency magnetic field assisted magnetic recording head in which the positional relationship of a main magnetic pole and a spin torque oscillator in a cross-track direction is accurately determined, and in which variations are not caused in high frequency magnetic field assist characteristics, and a method of manufacturing the structure. The high frequency magnetic field assisted magnetic recording head includes a main magnetic pole, a spin torque oscillator disposed on the main magnetic pole, and an insulating side gap covering a side surface of the main magnetic pole and a side surface of the spin torque oscillator. The main magnetic pole and the spin torque oscillator are formed between both side surfaces of the side gap. Thus, a self-alignment structure of the high frequency magnetic field assisted magnetic recording head is obtained.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: December 23, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Kikuo Kusukawa, Junichiro Shimizu, Katsuro Watanabe
  • Publication number: 20140313616
    Abstract: Provided are a structure of a high frequency magnetic field assisted magnetic recording head in which the positional relationship of a main magnetic pole and a spin torque oscillator in a cross-track direction is accurately determined, and in which variations are not caused in high frequency magnetic field assist characteristics, and a method of manufacturing the structure. The high frequency magnetic field assisted magnetic recording head includes a main magnetic pole, a spin torque oscillator disposed on the main magnetic pole, and an insulating side gap covering a side surface of the main magnetic pole and a side surface of the spin torque oscillator. The main magnetic pole and the spin torque oscillator are formed between both side surfaces of the side gap. Thus, a self-alignment structure of the high frequency magnetic field assisted magnetic recording head is obtained.
    Type: Application
    Filed: April 17, 2014
    Publication date: October 23, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Kikuo KUSUKAWA, Junichiro SHIMIZU, Katsuro WATANABE
  • Publication number: 20140063658
    Abstract: To uniformly determine the positional relationship between a main magnetic pole and a spin torque oscillator while independently optimizing the main magnetic pole and the spin torque oscillator. On a trailing end surface of a main magnetic pole, a step is provided at the boundary between the main magnetic pole and a gap material disposed on both sides thereof, and a spin torque oscillator is formed on the step. The spin torque oscillator is effectively separated into two regions by utilizing the step. Further, a part of the spin torque oscillator is removed so as to disable the unwanted region, thereby realizing a self-alignment type high frequency magnetic field assisted magnetic recording head structure such that the positions of the end portions of the main magnetic pole and the spin torque oscillator are aligned.
    Type: Application
    Filed: August 16, 2013
    Publication date: March 6, 2014
    Applicant: HITACHI, LTD.
    Inventors: Junichiro SHIMIZU, Kikuo KUSUKAWA, Yo SATO, Masukazu IGARASHI
  • Patent number: 8547804
    Abstract: In a magnetic recording head including an optical waveguide for guiding a laser beam to a surface of a magnetic recording medium, a shield is provided in the vicinity of at least one portion changing discontinuously in structure of the optical waveguide to absorb or reflect non-propagating light leaking from the discontinuous portion to the outside of the optical waveguide.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: October 1, 2013
    Assignee: Hitachi, Ltd.
    Inventor: Junichiro Shimizu
  • Patent number: 8477570
    Abstract: A slider including a magnetic head part, an optical waveguide, and a near field element is fixed by first and second adhesives to a submount on which a semiconductor laser and a mirror are mounted, the mirror being placed at one end of the semiconductor laser in a resonance direction thereof and reflecting a laser in a direction intersecting with the resonance direction. At this time, at least parts of the first and second adhesives are applied to a position opposed to the semiconductor laser with an intermediation of the submount. The first adhesive having a higher Young's modulus than that of the second adhesive is applied onto an inflow end side of the slider including a solder connection portion, the second adhesive being applied onto an outflow end side of the slider.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: July 2, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Satoshi Arai, Irizo Naniwa, Junichiro Shimizu, Takuya Matsumoto, Shigeyuki Sasaki
  • Patent number: 8406093
    Abstract: Provided is a thermal-assisted-magnetic-recording head capable of directing, to a magnetic recording medium, light in which the spot size is reduced to submicron order with high total optical propagation efficiency. A light coupling unit that guides light emitted from the light source into a magnetic head and a high-refractive-index core that couples with the light guided by the light coupling unit to lead the light to an air bearing surface are arranged in the magnetic head. The light coupling unit includes a plurality of thin-film-like cores that are separated from each other by a clad material. An upper part of the high-refractive-index core is placed between two thin-film-like cores.
    Type: Grant
    Filed: October 13, 2010
    Date of Patent: March 26, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Yasuhiko Iwanabe, Takuya Matsumoto, Junichiro Shimizu, Harukazu Miyamoto
  • Publication number: 20120320719
    Abstract: A slider including a magnetic head part, an optical waveguide, and a near field element is fixed by first and second adhesives to a submount on which a semiconductor laser and a mirror are mounted, the mirror being placed at one end of the semiconductor laser in a resonance direction thereof and reflecting a laser in a direction intersecting with the resonance direction. At this time, at least parts of the first and second adhesives are applied to a position opposed to the semiconductor laser with an intermediation of the submount. The first adhesive having a higher Young's modulus than that of the second adhesive is applied onto an inflow end side of the slider including a solder connection portion, the second adhesive being applied onto an outflow end side of the slider.
    Type: Application
    Filed: November 30, 2009
    Publication date: December 20, 2012
    Inventors: Satoshi Arai, Irizo Naniwa, Junichiro Shimizu, Takuya Matsumoto, Shigeyuki Sasaki
  • Patent number: 8300503
    Abstract: In a thermally assisted magnetic recording head having a light source and a waveguide to lead a laser beam radiated from the light source to a front end of the magnetic head, while blocking an adverse effect of heat generated in the light source and securing a good floating characteristic, the light source and the magnetic head are optically coupled with high efficiency and the magnetic head itself is reduced in size. This invention provides a reflection mirror that is formed of a part or whole of one inclined end surface of the semiconductor laser mounted on the first submount. Near one end surface of the slider is provided the optical waveguide that pierces through the slider in a direction of the thickness thereof.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: October 30, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Satoshi Arai, Naoki Matsushima, Irizo Naniwa, Junichiro Shimizu
  • Patent number: 8270262
    Abstract: In a thermally assisted magnetic recording head (10A), a sub-mount (8A) on which a laser diode is mounted is arranged between an HGA (41) and a magnetic head slider (9). The sub-mount has a wiring line (81) which electrically connects a terminal (91) arranged on the magnetic head slider (9) and a terminal (411) arranged on the HGA (41).
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: September 18, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Irizo Naniwa, Takuya Matsumoto, Satoshi Arai, Junichiro Shimizu
  • Publication number: 20120051195
    Abstract: In a magnetic recording head including an optical waveguide for guiding a laser beam to a surface of a magnetic recording medium, a shield is provided in the vicinity of at least one portion changing discontinuously in structure of the optical waveguide to absorb or reflect non-propagating light leaking from the discontinuous portion to the outside of the optical waveguide.
    Type: Application
    Filed: August 24, 2011
    Publication date: March 1, 2012
    Applicant: HITACHI, LTD.
    Inventor: Junichiro SHIMIZU
  • Patent number: 8054571
    Abstract: A thermally assisted magnetic recording head includes a flying slider, a magnetic field generation device mounted on the flying slider, a first waveguide disposed near the magnetic field generation device for guiding incident light from a top surface of the flying slider on a side of the flying slider toward an air bearing bottom surface of the flying slider, an optical near-field generator disposed at an emission end of the first waveguide, a second waveguide which is separate from the first waveguide and which is spaced from and coupled to the first waveguide at a distance of no greater than a light wavelength, and a first optical detector for detecting the intensity of light propagating in the second waveguide. The first waveguide and the second waveguide are disposed so as to extend in a direction substantially perpendicular to the air bearing bottom surface of the flying slider.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: November 8, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Takuya Matsumoto, Junichiro Shimizu
  • Publication number: 20110149698
    Abstract: In a thermally assisted magnetic recording head (10A), a sub-mount (8A) on which a laser diode is mounted is arranged between an HGA (41) and a magnetic head slider (9). The sub-mount has a wiring line (81) which electrically connects a terminal (91) arranged on the magnetic head slider (9) and a terminal (411) arranged on the HGA (41).
    Type: Application
    Filed: June 1, 2009
    Publication date: June 23, 2011
    Applicant: HITACHI, LTD.
    Inventors: Irizo Naniwa, Takuya Matsumoto, Satoshi Arai, Junichiro Shimizu
  • Publication number: 20110141862
    Abstract: In a thermally assisted magnetic recording head having a light source and a waveguide to lead a laser beam radiated from the light source to a front end of the magnetic head, while blocking an adverse effect of heat generated in the light source and securing a good floating characteristic, the light source and the magnetic head are optically coupled with high efficiency and the magnetic head itself is reduced in size. This invention provides a reflection mirror that is formed of a part or whole of one inclined end surface of the semiconductor laser mounted on the first submount. Near one end surface of the slider is provided the optical waveguide that pierces through the slider in a direction of the thickness thereof.
    Type: Application
    Filed: June 3, 2009
    Publication date: June 16, 2011
    Applicant: Hitachi, Ltd.
    Inventors: Satoshi Arai, Naoki Matsushima, Irizo Naniwa, Junichiro Shimizu
  • Publication number: 20110090770
    Abstract: Provided is a thermal-assisted-magnetic-recording head capable of directing, to a magnetic recording medium, light in which the spot size is reduced to submicron order with high total optical propagation efficiency. A light coupling unit that guides light emitted from the light source into a magnetic head and a high-refractive-index core that couples with the light guided by the light coupling unit to lead the light to an air bearing surface are arranged in the magnetic head. The light coupling unit includes a plurality of thin-film-like cores that are separated from each other by a clad material. An upper part of the high-refractive-index core is placed between two thin-film-like cores.
    Type: Application
    Filed: October 13, 2010
    Publication date: April 21, 2011
    Inventors: Yasuhiko IWANABE, Takuya Matsumoto, Junichiro Shimizu, Harukazu Miyamoto
  • Patent number: 7921436
    Abstract: An optical device integrated head having high light utilizing efficiency by decreasing the propagation loss caused from an optical source to a recording medium, conducting by mounting according to compact active alignment method for efficiently guiding a light generated from a laser device to the top end of a head, in which a light source device mounted on a submount has a mirror portion having an inclinated surface to at least a portion of one edge thereof for reflecting an output light from the optical source device at the inclinated surface, a structural member including a lens structure for further allowing a light to pass through the submount, and an optical waveguide disposed passing through a slider for mounting the submount, and the optical source and the slider are positioned by using active alignment of light in a chip-on carrier structure having the optical source device mounted on the submount.
    Type: Grant
    Filed: February 14, 2008
    Date of Patent: April 5, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Junichiro Shimizu, Masato Shishikura