Patents by Inventor Masahiko Hashimoto

Masahiko Hashimoto 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: 10460752
    Abstract: A magnetic recording write head and system has a spin-torque oscillator (STO) located between the write head's write pole and trailing shield. The STO's ferromagnetic free layer is located near the write pole with a multilayer seed layer between the write pole and the free layer. The STO's nonmagnetic spacer layer is between the free layer and the STO's ferromagnetic polarizer. The polarizer may be the trailing shield of the write head or a separate polarizer layer. The STO electrical circuitry causes electron flow from the write pole to the trailing shield. The multilayer seed layer removes the spin polarization of electrons from the write pole, which enables electrons reflected from the polarizer layer to become spin polarized, which creates the spin transfer torque on the magnetization of the free layer. The multilayer seed layer includes Mn or a Mn-alloy layer between one or more metal or metal alloy films.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: October 29, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: James Mac Freitag, Zheng Gao, Masahiko Hashimoto, Sangmun Oh
  • Patent number: 10446175
    Abstract: A spin transfer torque (STT) device is formed on an electrically conductive substrate and includes a ferromagnetic free layer near the substrate, a ferromagnetic polarizing layer and a nonmagnetic spacer layer between the free layer and the polarizing layer. A multilayer structure is located between the substrate and the free layer. The multilayer structure includes a metal or metal alloy seed layer for the free layer and an intermediate oxide layer below and in contact with the seed layer. The intermediate oxide layer reflects spin current from the free layer and thus reduces undesirable damping of the oscillation of the free layer's magnetization by the seed layer.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: October 15, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: James Mac Freitag, Susumu Okamura, Masahiko Hashimoto, Zheng Gao
  • Publication number: 20190279667
    Abstract: A spin transfer torque (STT) device has a free ferromagnetic layer that includes a Heusler alloy layer and a template layer beneath and in contact with the Heusler alloy layer. The template layer may be a ferromagnetic alloy comprising one or more of Co, Ni and Fe and the element X, where X is selected from one or more of Ta, B, Hf, Zr, W, Nb and Mo. A CoFe nanolayer may be formed below and in contact with the template layer. The STT device may be a spin-torque oscillator (STO), like a STO incorporated into the write head of a magnetic recording disk drive. The STT device may also be a STT in-plane or perpendicular magnetic tunnel junction (MTJ) cell for magnetic random access memory (MRAM). The template layer reduces the critical current density of the STT device.
    Type: Application
    Filed: May 10, 2018
    Publication date: September 12, 2019
    Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: JAMES MAC FREITAG, ZHENG GAO, MASAHIKO HASHIMOTO, SANGMUN OH, HUA AI ZENG
  • Publication number: 20190279666
    Abstract: A spin transfer torque (STT) device is formed on an electrically conductive substrate and includes a ferromagnetic free layer near the substrate, a ferromagnetic polarizing layer and a nonmagnetic spacer layer between the free layer and the polarizing layer. A multilayer structure is located between the substrate and the free layer. The multilayer structure includes a metal or metal alloy seed layer for the free layer and an intermediate oxide layer below and in contact with the seed layer. The intermediate oxide layer reflects spin current from the free layer and thus reduces undesirable damping of the oscillation of the free layer's magnetization by the seed layer.
    Type: Application
    Filed: May 16, 2017
    Publication date: September 12, 2019
    Inventors: James Mac Freitag, Susumu Okamura, Masahiko Hashimoto, Zheng Gao
  • Publication number: 20190279668
    Abstract: A magnetic recording write head and system has a spin-torque oscillator (STO) located between the write head's write pole and trailing shield. The STO's ferromagnetic free layer is located near the write pole with a multilayer seed layer between the write pole and the free layer. The STO's nonmagnetic spacer layer is between the free layer and the STO's ferromagnetic polarizer. The polarizer may be the trailing shield of the write head or a separate polarizer layer. The STO electrical circuitry causes electron flow from the write pole to the trailing shield. The multilayer seed layer removes the spin polarization of electrons from the write pole, which enables electrons reflected from the polarizer layer to become spin polarized, which creates the spin transfer torque on the magnetization of the free layer. The multilayer seed layer includes Mn or a Mn-alloy layer between one or more metal or metal alloy films.
    Type: Application
    Filed: May 10, 2018
    Publication date: September 12, 2019
    Inventors: James Mac FREITAG, Zheng GAO, Masahiko HASHIMOTO, Sangmun OH
  • Publication number: 20190259412
    Abstract: Spin transfer torque (STT) devices with multilayer seed layers that can be used in magnetic recording and memory are provided. One such STT device includes a substrate, and a stack of layers formed on the substrate, where the stack includes a first seed layer directly on the substrate and including Cr, a second seed layer on the first seed layer and including Ta, a ferromagnetic free layer on the second seed layer; a ferromagnetic polarizing layer, and a nonmagnetic spacer layer between the free layer and the polarizing layer. One such method includes fabricating the STT device.
    Type: Application
    Filed: February 15, 2019
    Publication date: August 22, 2019
    Inventors: Zheng GAO, Masahiko HASHIMOTO, Susumu OKAMURA, James Mac FREITAG
  • Patent number: 10352395
    Abstract: A vibration-damping electromagnetic actuator including: a tubular stator including at least one coil member having a coil and an outer yoke attached to the coil; a mover including a permanent magnet and at least one inner yoke superposed in an axial direction of the stator, the mover being inserted into the tubular stator as axially displaceable relative to the stator through energization to the coil; and an inner tubular part provided at the outer yoke being superposed on an inner peripheral face of the coil to have a magnetic gap, wherein the at least one inner yoke has a thick part at an outer peripheral part thereof, and a lightening part at an inner peripheral part thereof so that an axial dimension of the inner yoke is smaller in a formation part of the lightening part than in the thick part.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: July 16, 2019
    Assignee: SUMITOMO RIKO COMPANY LIMITED
    Inventors: Takayoshi Yasuda, Hironori Koyama, Masahiko Nagasawa, Yushi Hashimoto
  • Patent number: 10288732
    Abstract: A detection device includes: a first correlation circuit that computes correlation of a first wave detection signal, which is a phase-modulated input wave detected at determined frequency, with a determined code sequence for every code composing the determined code sequence, and to generate first correlation signals the number of which corresponds to a code sequence length, which is a length of the determined code sequence; and a control circuit that rotates phases of the first correlation signals, generates an added value by adding the phase-rotated first correlation signals, and determines based on the added value whether the phase-modulated input wave is a return wave from a determined object.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: May 14, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tadashi Morita, Masahiko Hashimoto
  • Publication number: 20180267167
    Abstract: A detection apparatus that includes correlation processing systems that each find a correlation between a predetermined code sequence and a wave detection signal obtained by detecting a phase-modulated input wave at a frequency different from a frequency used by a different one of the correlation processing systems, and thereby generate a correlation signal, level reduction processors that each receive the correlation signal from a corresponding one of the plurality of correlation processing systems and reduce a level of the received correlation signal when the correlation signal is not to be used for detection of the target or do not reduce the level of the received correlation signal when the correlation signal is to be used for detection of the target, and a detector that detects at least presence or absence of the target based on the correlation signal processed by each of the plurality of level reduction processors.
    Type: Application
    Filed: February 27, 2018
    Publication date: September 20, 2018
    Inventors: TADASHI MORITA, MASAHIKO HASHIMOTO
  • Publication number: 20180088231
    Abstract: A detection device includes: a first correlation circuit that computes correlation of a first wave detection signal, which is a phase-modulated input wave detected at determined frequency, with a determined code sequence for every code composing the determined code sequence, and to generate first correlation signals the number of which corresponds to a code sequence length, which is a length of the determined code sequence; and a control circuit that rotates phases of the first correlation signals, generates an added value by adding the phase-rotated first correlation signals, and determines based on the added value whether the phase-modulated input wave is a return wave from a determined object.
    Type: Application
    Filed: September 18, 2017
    Publication date: March 29, 2018
    Inventors: TADASHI MORITA, MASAHIKO HASHIMOTO
  • Publication number: 20160075138
    Abstract: A liquid discharge device includes: a liquid discharge head that includes a nozzle surface on which a plurality of nozzles discharging liquid are disposed; a moisture retention cap that includes a liquid storage portion including a bottom surface inclined with respect to a horizontal plane and storing moisturizing liquid, a supply port supplying the moisturizing liquid to the liquid storage portion, and a discharge port provided on the bottom surface so as to be disposed below the supply port and discharging the moisturizing liquid, and retains the moisture of the nozzle surface; moving means for moving the liquid discharge head to an image formation position where the liquid discharge head discharges liquid to form an image on a medium and a standby position where moisture of the nozzle surface is retained; and moisturizing liquid controller controlling a level of the moisturizing liquid stored in the liquid storage portion.
    Type: Application
    Filed: November 30, 2015
    Publication date: March 17, 2016
    Applicant: FUJIFILM Corporation
    Inventor: Masahiko HASHIMOTO
  • Patent number: 9197969
    Abstract: An optical microphone includes: an acousto-optic medium section having a pair of principal surfaces and at least one lateral surface provided therebetween; a restraint section which is in contact with the at least one lateral surface for preventing a shape change of the acousto-optic medium section; and a light emitting section for emitting a light wave so as to propagate through the acousto-optic medium section between the pair of principal surfaces. The pair of principal surfaces are in contact with an environmental fluid through which an acoustic wave to be detected is propagating and are capable of freely vibrating, and an optical path length variation of a light wave propagating through the acousto-optic medium section, which is caused by the acoustic wave that comes into the acousto-optic medium section from at least one of the pair of principal surfaces and propagates through the acousto-optic medium section, is detected.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: November 24, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takuya Iwamoto, Kazuo Yokoyama, Masahiko Hashimoto, Ushio Sangawa, Yuriko Kaneko
  • Patent number: 9173039
    Abstract: An optical microphone for detecting an acoustic wave propagating through an environmental fluid by using a light wave, includes: an acoustic wave receiving section having a propagation medium portion through which an acoustic wave propagate and a first support portion for supporting the propagation medium portion; a light source for outputting a light wave so that the light wave passes through the propagation medium portion across the acoustic wave propagating through the propagation medium portion; a light-blocking portion having an edge line for splitting the light wave having passed through the propagation medium portion into a blocked portion and a non-blocked portion; and a photoelectric conversion section for receiving a portion of the light wave having passed through the propagation medium portion which has not been blocked by the light-blocking portion to output an electric signal.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: October 27, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takuya Iwamoto, Masahiko Hashimoto, Ushio Sangawa, Yuriko Kaneko
  • Patent number: 9057008
    Abstract: A porous silica material disclosed in the present application is a porous silica material in which a plurality of silica particles are connected to one another three-dimensionally, wherein: a density of the porous silica material is less than 220 kg/m3; a particle diameter of the silica particles is 3.5 nm or more; and the water content of the porous silica material is 8 wt % or less.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: June 16, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yuriko Kaneko, Takuya Iwamoto, Ushio Sangawa, Masahiko Hashimoto, Norihisa Mino
  • Patent number: 9028788
    Abstract: A porous silica material in which silica particles are connected to one another three-dimensionally, wherein: the porous silica material includes a through hole including first pores smaller than a mean free path of an air, and second pores larger than the first pores; the porous silica material has a density of 100 kg/m3 or more and 300 kg/m3 or less; and an isobutyl group is bound to silicon of silica of the silica particles.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: May 12, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yuriko Kaneko, Takuya Iwamoto, Ushio Sangawa, Masahiko Hashimoto, Norihisa Mino
  • Patent number: 9014565
    Abstract: An optical microphone includes: a light source; a first polarizer for allowing linearly-polarized light, of light output from the light source, to pass therethrough; a second polarizer for allowing linearly-polarized light having a different polarization plane from the first polarizer to pass therethrough; a sound-receiving section including an acoustic medium having a smaller sound velocity than the air, wherein an acoustic signal propagates through the acoustic medium, the sound-receiving section being arranged so that the linearly-polarized light from the first polarizer passes through the acoustic medium and enters the second polarizer; and a photodetector for converting an intensity of light having passed through the second polarizer to an electric signal, wherein between the first polarizer and the second polarizer, the linearly-polarized light having passed through the first polarizer is given different phase shifts in two orthogonal directions which are each different from a polarization direction.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: April 21, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Ushio Sangawa, Takuya Iwamoto, Yuriko Kaneko, Masahiko Hashimoto
  • Patent number: 8948603
    Abstract: An optical microphone includes: a propagation medium portion; a light source to output a light wave passing through the propagation medium portion across the acoustic wave propagating through the propagation medium portion; a reflecting section to retroreflect the light wave having passed through the propagation medium portion; and a photoelectric conversion section to receive the light wave having been reflected by the reflecting section and passed through the propagation medium portion to output an electric signal. 0th-order, +1st-order and ?1st-order diffracted light waves are respectively produced on outward and return paths, by virtue of a refractive index distribution across the propagation medium portion caused by the propagation of the acoustic wave therethrough. The photoelectric conversion section detects interference light between the +1st-order or ?1st-order diffracted light wave of the outward path and the ?1st-order or +1st-order diffracted light wave of the return path.
    Type: Grant
    Filed: January 29, 2013
    Date of Patent: February 3, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takuya Iwamoto, Masahiko Hashimoto, Ushio Sangawa, Yuriko Kaneko
  • Publication number: 20140293737
    Abstract: An acousto-optic image capture device includes: an acoustic wave source to irradiating an object with an acoustic wave; an acoustic lens system which transforms a scattered wave from the object into a plane acoustic wave; an acousto-optic medium portion which is arranged so that the scattered wave transmitted through the acoustic lens system is incident there; a light source to emit a light beam in which monochromatic rays of light with different traveling directions are superposed and which is incident on the acousto-optic medium portion; an imaging lens system which condenses diffracted rays of light of the plane wave monochromatic rays of light produced by the acousto-optic medium portion; and an image receiving member which detects the rays of light condensed by the imaging lens system to output an electrical signal. The acoustic lens system includes at least two reflecting mirrors.
    Type: Application
    Filed: January 2, 2014
    Publication date: October 2, 2014
    Applicant: Panasonic Corporation
    Inventors: Ushio SANGAWA, Takuya IWAMOTO, Yuriko KANEKO, Takahiro KAMAI, Masahiko HASHIMOTO
  • Patent number: 8813571
    Abstract: There is provided an optical microphone for detecting an acoustic wave propagating in an ambient fluid, the optical microphone including: a propagation medium section; a light source for emitting a light wave to be transmitted through a diffraction region in the propagation medium section; and a photoelectric conversion section for detecting the light wave having been transmitted through the propagation medium section. A first acoustic wave which is a portion of the acoustic wave and a second acoustic wave which is another portion thereof are allowed to propagate in the propagation medium section so as to simultaneously arrive at the diffraction region, and an interference component between a +1st order diffracted light wave and a ?1st order diffracted light wave of the light wave generated based on a refractive index distribution of the propagation medium occurring in the diffraction region.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: August 26, 2014
    Assignee: Panasonic Corporation
    Inventors: Takuya Iwamoto, Masahiko Hashimoto, Ushio Sangawa, Yuriko Kaneko
  • Patent number: D827841
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: September 4, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Naoki Tanaka, Masahiko Hashimoto, Takuya Iwamoto, Katsu Takeda, Takuji Watanabe, Kenji Sano