Magnetic Field And Light Beam Patents (Class 369/13.02)
  • Patent number: 10614849
    Abstract: A heat-assisted magnetic recording medium includes a substrate, an underlayer, and a magnetic layer including an alloy having a L10 crystal structure and first and second layers, arranged in this order. Each of the first and second layers has a granular structure including C, SiO2, and BN at grain boundaries. Vol % of the grain boundaries in each of the first and second layers is 25 to 45 vol %. Vol % of C in the first layer is 5 to 22 vol %, and a volume ratio of SiO2 with respect to BN in each of the first and second layers is 0.25 to 3.5. Vol % of SiO2 in the second layer is greater than that of the first layer by 5 vol % or more. Vol % of BN in the second layer is smaller than that in the first layer by 2 vol % or more.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: April 7, 2020
    Assignee: SHOWA DENKO K.K.
    Inventors: Takayuki Fukushima, Koji Take, Hisato Shibata, Takehiro Yamaguchi, Tomoo Shige, Lei Zhang, Chen Xu, Yuji Umemoto, Hiroshi Koyanagi, Kazuya Niwa, Tetsuya Kanbe
  • Patent number: 10579284
    Abstract: A computer-implemented method according to one embodiment includes identifying an erasure code storage policy for an unified file and object storage system, determining a plurality of storage disks associated with the erasure code storage policy, retrieving disk health parameters for each of the plurality of storage disks, identifying a number of available outer partition storage blocks for each of the plurality of storage disks, and determining a number of erasure code fragments to be stored for a file within the unified file and object storage system before initiating an objectization process on the file, utilizing the disk health parameters for each of the plurality of storage disks and the number of available outer partition storage blocks for each of the plurality of storage disks.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: March 3, 2020
    Assignee: International Business Machines Corporation
    Inventors: Sasikanth Eda, Prayas Gupta, Poornima Gupte, Sandeep R. Patil
  • Patent number: 10339969
    Abstract: A method involves determining bit aspect ratios for interlaced tracks written to a magnetic recording medium. The interlaced tracks include top tracks that are written partially overlapping with bottom tracks. Isolated test tracks are written at first different bit aspect ratios to determine a top bit aspect ratio that achieves a first target areal density for the isolated test tracks. Test tracks are written at second different bit aspect ratios to determine a bottom bit aspect ratio that achieves a second target areal density for the test tracks. Top test tracks of the test tracks are written at the top bit aspect ratio. The top and bottom bit aspect ratios are selected to subsequently write partially-overlapping tracks on the magnetic recording medium.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: July 2, 2019
    Assignee: Seagate Technology LLC
    Inventors: Edmun Chian Song Seng, Det Hau Wu, Lin Nah Lim, Jose Mari Corral Toribio, Luh Chyuan Lau, Utt Heng Kan, Meng Suan June Lee
  • Patent number: 10062403
    Abstract: The magnetic tape device includes a magnetic tape; and a servo head, in which the servo head is a TMR head, the magnetic tape includes a servo pattern in the magnetic layer, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and a ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster thereof in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: August 28, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10056108
    Abstract: A method involves determining bit aspect ratios for interlaced tracks written to a magnetic recording medium. The interlaced tracks include top tracks that are written partially overlapping and interlaced with bottom tracks. Isolated test tracks are written at first different bit aspect ratios to determine a top bit aspect ratio that achieves a first target areal density for the isolated test tracks. Interlaced test tracks are written at second different bit aspect ratios to determine a bottom bit aspect ratio that achieves a second target areal density for the interlaced test tracks. Top test tracks of the interlaced test tracks are written at the top bit aspect ratio. The top and bottom bit aspect ratios are selected to subsequently write interlaced tracks on the magnetic recording medium.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: August 21, 2018
    Assignee: Seagate Technology LLC
    Inventors: Edmun Chian Song Seng, Det Hau Wu, Lin Nah Lim, Jose Mari Corral Toribio, Luh Chyuan Lau, Utt Heng Kan, Meng Suan June Lee
  • Patent number: 9754618
    Abstract: A heat-assisted magnetic recording (HAMR) medium includes a substrate, a split heat-sink structure (SHSS) and a magnetic recording layer. The SHSS includes a first heat-sink layer disposed on the substrate, a heat-sink break layer (HSBL) disposed on the first heat-sink layer, and a second heat-sink layer disposed on the HSBL. The magnetic recording layer is disposed on the SHSS. The SHSS is configured to enable use of a reduced operating current of the laser while maintaining about the same write performance properties as a thermal barrier layer, heat-assisted magnetic recording (TBLHAMR) medium that includes a thermal barrier layer (TBL) and a heat-sink layer that is greater than about 20% thicker than the thickness of the SHSS. A HAMR data storage device that incorporates the HAMR medium within a HAMR disk, and a method for making the HAMR medium are also described.
    Type: Grant
    Filed: April 22, 2016
    Date of Patent: September 5, 2017
    Assignee: WD MEDIA, LLC
    Inventors: Kumar Srinivasan, Antony Ajan, George M. Chapline
  • Patent number: 9524748
    Abstract: Embodiments are related to systems and methods for data processing, and more particularly to systems and methods for multi-dimensional signal equalization. In one case, a data processing system is discussed that includes: a first equalizer governed at least in part by a first coefficient; a second equalizer circuit governed at least in part by a second coefficient; and a constraint circuit operable to force a sum of at least the first coefficient and the second coefficient to equal a defined value.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: December 20, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Jongseung Park, George Mathew
  • 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: 9336808
    Abstract: A system including a magnetic tape processing system that includes a read/write head to write to a top surface of a magnetic tape. The read/write head provides a write head field gradient of at least 40 Oersteds per nanometer at the top surface of the magnetic tape. The magnetic tape processing system and the read/write head provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: May 10, 2016
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Mike Alan Holmberg, Geoff Spratt, Brian Brong, Mike Sharrock, Steven L. Brittenham, Scott A. Swanbeck, Eric Petersen, Lawrence A. Hansen, Paul W. Poorman
  • Patent number: 9224381
    Abstract: An audio signal processing apparatus does not drive a drive unit in a period during which an audio signal used for noise reduction processing is acquired, or does not stop a recording operation until the audio signal used for noise reduction processing is acquired.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: December 29, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Fumihiro Kajimura
  • Patent number: 9179521
    Abstract: An operating device (1) for light-emitting device (5), where the operating device (1) has an interface circuit (2) and a drive circuit (3), where the interface circuit (2) generates an interface signal (21, 31, 41, 51) depending on a control signal (Vn, 10), and where the drive circuit (3) drives at least one light-emitting device (5) depending on the interface signal (21, 31, 41, 51). The control signal (Vn, 10) is an AC voltage control signal generated outside the operating device (1). The interface circuit (2) detects overshooting of an upper threshold value of only one of two half-waves of the control signal (Vn, 10), and the interface circuit (2) generates a first signal pulse (22, 55) in the interface signal (21, 31, 41, 51) for each detection of overshooting of an upper threshold value and identifies overshooting of a lower threshold value for the other half-wave.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: November 3, 2015
    Assignee: TRIDONIC GMBH & CO KG
    Inventor: Reinhard Böckle
  • Patent number: 9171562
    Abstract: A laser diode device is affixed to a mounting face of a slider, opposite the air bearing surface. The laser includes a submount having an electrically conductive surface layer that is normal to the mounting face. The electrically conductive surface layer is a patterned metal layer that includes a lateral probing region and a laser mounting region to which a laser is soldered. The laser mounting region is connected to the lateral probing region by a bridge portion of the patterned metal layer. The laser mounting region is otherwise separated from the lateral probing region by a solder blocking gap in which the submount lacks the patterned metal layer, and which is adjacent to the laser. The solder blocking gap defines a solder blocking gap height normal to the mounting face that is in the range of ?rds to ?ths of a total height of the laser mounting region.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: October 27, 2015
    Assignee: Western Digital (Fremont), LLC
    Inventors: Wachira Puttichaem, Bin Ouyang
  • Patent number: 9030773
    Abstract: An apparatus includes a near-field transducer at or near an air bearing surface of the apparatus. A write pole is disposed at or near the air bearing surface and proximate the near-field transducer, respectively. A thermal sensor is disposed at the air bearing surface and within a protrusion region of the air bearing surface defined relative to at least one of the near-field transducer and the write pole. The thermal sensor is configured to produce a signal indicative of a temperature at the protrusion region.
    Type: Grant
    Filed: September 15, 2014
    Date of Patent: May 12, 2015
    Assignee: Seagate Technology LLC
    Inventors: Declan Macken, James Dillon Kiely, Manuel Charles Anaya-Dufresne
  • Patent number: 9025422
    Abstract: The present invention relates to a plasmon generator, in which a surface plasmon is excited by application of light. The plasmon generator extends along one direction. The plasmon generator includes a first end surface that is positioned on one end in the one direction and at which near-field light is generated along with the excitation of the plasmon; and a second cross section that is substantially parallel to the first end surface and is away from the first end surface. The first end surface has a polygonal shape that does not have a substantially acute inner angle. The second cross section has an upper part that has a shape substantially the same as or similar to that of the first end surface and a flare shaped lower part that is connected to the upper part and has a width that increases as it is far from the upper part.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: May 5, 2015
    Assignee: TDK Corporation
    Inventors: Susumu Aoki, Kosuke Tanaka, Keita Kawamori, Hiroki Kawato, Takeshi Tsutsumi
  • Patent number: 9013963
    Abstract: A flex circuit including a dual sided interconnect structure to connect electrical components on a head or suspension assembly to head circuitry is described. The dual sided interconnect structure described has application for providing an electrical connection to one or more transducer elements on a slider and one or more elements of a heat assisted magnetic recording HAMR unit. In an illustrated embodiment, a flexible structure or insulating base layer includes one or more slider and heat assisted magnetic recording traces coupled to one or more slider or HAMR bond pads on an interconnect portion. As disclosed, the slider bond pads are on the obverse side of the flexible structure and the HAMR bond pads include a reverse side bonding surface to form reverse side bond pads to connect to one or more electrical or heating elements on the HAMR unit.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventors: Bradley J. Ver Meer, Ravishankar Ajjanagadde Shivarama
  • Publication number: 20150072593
    Abstract: An electrical lapping guide has a body with a thickness along a wafer axis, the body comprising a layer of conductive material having a resistivity. The conductive material layer comprises a first contact region and a second contact region, the first and second contact regions configured to electrically connect the electrical lapping guide to electrical leads. A lapping edge comprises an air-bearing plane axis perpendicular to a lapping axis, and a back edge opposite the lapping edge, the back edge comprising a plurality of notches.
    Type: Application
    Filed: September 6, 2013
    Publication date: March 12, 2015
    Applicant: Seagate Technology LLC
    Inventors: Yongjun Zhao, David C. Seets, Mark Ostrowski
  • Publication number: 20150043316
    Abstract: An apparatus comprises a write transducer comprising a write pole having a tip portion proximate a media-facing surface and a return pole spaced apart from the write pole in a downtrack direction. The apparatus further includes first and second heat sink portions. The first heat sink portion surrounds a first side of the tip portion that faces the return pole and extends outwards from the tip portion in a cross-track direction. The second heat sink portion comprises a first surface proximate the first heat sink portion and a second surface proximate the return pole and extends outwards in the cross-track direction further than the first heat sink portion.
    Type: Application
    Filed: August 7, 2013
    Publication date: February 12, 2015
    Applicant: Seagate Technology LLC
    Inventors: Chris Rea, Zoran Jandric, Hua Zhou
  • Patent number: 8942071
    Abstract: A system comprises a writer to form a plurality of color mits on a base material, wherein at least one of the color mits may represent computer-readable instructions comprising data other than pixel-image data. The plurality of color mits may include a first color mit and a second color mit, wherein the first color mit represents information data, and the second color mit represents that the first color mit contains a particular type of information data. The system also may include a reader to read colors of the plurality of color mits on the base material. The system may comprise a device to map at least one of the color mits to computer-readable instructions. The system may further comprise a processor configured to transmit signals using a colored light.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: January 27, 2015
    Inventors: Lucinda Price, Joseph Auciello, Charles Price, Stanley Jacobson
  • Publication number: 20150009785
    Abstract: A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer.
    Type: Application
    Filed: September 23, 2014
    Publication date: January 8, 2015
    Inventors: Zhimin YUAN, Bo Liu, Jianzhong Shi, Weidong Zhou
  • Patent number: 8885447
    Abstract: An aspect of the present invention relates to glass for a magnetic recording medium substrate, which comprises essential components in the form of SiO2, Li2O, Na2O, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO wherein a molar ratio of a content of CaO to a combined content of MgO, CaO, SrO, and BaO (CaO/(MgO+CaO+SrO+BaO)) is equal to or less than 0.20, and which has a glass transition temperature of equal to or higher than 650° C.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 11, 2014
    Assignee: Hoya Corporation
    Inventors: Naomi Matsumoto, Kazuaki Hashimoto
  • Patent number: 8842503
    Abstract: An apparatus comprises a write transducer, an energy source, and a controller. The write transducer is configured to write data to a magnetic recording medium, and the energy source is configured to heat the magnetic recording medium while it is being written to by the write transducer. The controller is coupled to the write transducer and configured to adjust at least an operating power of the energy source to selectably cause bits having variable bit aspect ratios to be written to the magnetic media.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: September 23, 2014
    Assignee: Seagate Technology LLC
    Inventors: Tim Rausch, Edward Charles Gage
  • Patent number: 8837071
    Abstract: An apparatus includes a near-field transducer at or near an air bearing surface of the apparatus. A write pole is disposed at or near the air bearing surface and proximate the near-field transducer, respectively. A thermal sensor is disposed at the air bearing surface and within a protrusion region of the air bearing surface defined relative to at least one of the near-field transducer and the write pole. The thermal sensor is configured to produce a signal indicative of a temperature at the protrusion region.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: September 16, 2014
    Assignee: Seagate Technology LLC
    Inventors: Declan Macken, James Dillon Kiely, Manuel Charles Anaya-Dufresne
  • Patent number: 8824247
    Abstract: Magnetic write heads for heat-assisted magnetic recording (HAMR) are disclosed that include a laser diode having a light emitting edge or surface mounted on a slider, an optical waveguide, and a printed bonding agent disposed in an air gap between the laser diode and the slider. The printed bonding agent can be applied by ink jet printing or aerosol jet printing. Also included is a method that includes attaching a laser diode to a slider of a magnetic write head and depositing a bonding agent into the air gap using a focused stream of bonding agent. A light-emitting edge or surface of the laser diode is adjacent to an optical waveguide. The light-emitting edge or surface of the laser diode and the optical input of the waveguide define an aligned direction and an air gap extends from the light-emitting edge or surface of the laser diode in a direction perpendicular to the aligned direction. The bonding agent can be applied by ink jet printing or aerosol jet printing.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: September 2, 2014
    Assignee: Seagate Technology LLC
    Inventors: Jon Paul Hurley, Jason Boyd Elledge
  • Patent number: 8773957
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, wherein the head comprises a write element, a read element, and a laser operable to heat the disk while writing data to the disk. The disk is magnetized by writing a first test pattern to the disk using the write element and a first power applied to the laser. The magnetization of the first test pattern is destabilized by heating the disk using a second power applied to the laser, wherein the second power is less than the first power. After destabilizing the magnetization of the first test pattern, the first test pattern is read with the read element to generate a read signal, and the read signal is evaluated to detect a defect on the disk.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: July 8, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Eric J. Champion, Kroum S. Stoev, Michael Alex
  • Publication number: 20140177405
    Abstract: A magnetic device including: a magnetic reader; a magnetic writer; and a variable overcoat, the variable overcoat positioned over at least the magnetic reader and writer, the variable overcoat having an overcoat layer, the overcoat layer having a substantially constant thickness and material; and at least one disparate overcoat portion, the disparate overcoat portion having a different thickness, a different material, or both, than the overcoat layer.
    Type: Application
    Filed: March 8, 2013
    Publication date: June 26, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Edwin Frank Rejda, Joseph Michael Stephan, The Ngoc Nguyen, Neil Zuckerman, Gary J. Kunkel, Douglas H. Cole, Michael A. Seigler, Chris Rea
  • Patent number: 8760977
    Abstract: Systems and methods related to writing data to a storage medium. In some cases, a heat assisted loopback circuit is used that includes: a read circuit, a magnetic write circuit, a heat write circuit, and a loopback circuit. The loopback circuit is operable to selectively couple a derivative of a heat output to a read output and to selectively couple a derivative of a write output to the read output.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: June 24, 2014
    Assignee: LSI Corporation
    Inventor: Ross S. Wilson
  • Patent number: 8711661
    Abstract: A method performed by a disk drive, comprising: receiving a plurality of signal samples over a channel in the disk drive; executing a forward pattern-dependent noise prediction (PDNP) operation on the plurality of the signal samples; generating, based on execution of the forward PDNP operation, a first detection of recorded data bits in the plurality of received signal samples; executing a backward PDNP operation on the plurality of the received signal samples; generating, based on execution of the backward PDNP operation, a second detection of recorded data bits in the plurality of received signal samples; comparing the first detection to the second detection; identifying, based on comparing, one or more erasures in the received plurality of signal samples; and generating one or more sequences of bits that promote correction of the one or more erasures.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: April 29, 2014
    Assignee: Carnegie Mellon University
    Inventors: Yibin Ng, Vijayakumar Bhagavatula, Kui Cai
  • Publication number: 20140098652
    Abstract: A magnetic data recording system employing a slider having a laser diode mounted to a side surface of the slider rather than to a back surface opposite the air bearing surface. The laser diode provides a light source for thermal assisted recording. Locating the laser diode at the side surface eliminates the possibility of contact between laser diodes of adjacent sliders and allows larger, more powerful laser diodes to be employed. In addition, placing the laser diode at the side allows a micro-actuator to be attached to the back side surface of the slider, thereby allowing both thermally assisted recording and micro-actuation to be used in the same recording system.
    Type: Application
    Filed: October 5, 2012
    Publication date: April 10, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Tadaaki Tomiyama, Kenji Ito, Irizo Naniwa
  • Patent number: 8675456
    Abstract: A method of writing binary data comprising (i) heating a magnetic microstructure from an initial temperature to an above-ambient temperature that is not less than a transition temperature for the magnetic microstructure, which causes a phase transition interlayer of the magnetic microstructure to transition from an antiferromagnetic phase to a ferromagnetic phase; and (ii) reversing an orientation of magnetization of a magnetic storage layer of the magnetic microstructure with a magnetic field while the phase transition interlayer is in the ferromagnetic phase.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: March 18, 2014
    Assignee: Carnegie Mellon University
    Inventors: Jian-Gang (Jimmy) Zhu, David E. Laughlin
  • Patent number: 8619535
    Abstract: An apparatus according to one embodiment includes a near field transducer comprising a conductive metal film; and an optical waveguide for illumination of the near field transducer, a light guiding core layer of the optical waveguide being spaced from the near field transducer by less than about 100 nanometers and greater than 0 nanometers, wherein a longitudinal axis of the optical waveguide is substantially perpendicular to an air bearing surface.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: December 31, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Hamid Balamane, Thomas Dudley Boone, Jr., Neil Leslie Robertson, Barry Cushing Stipe, Timothy Carl Strand
  • Publication number: 20130343166
    Abstract: An aspect of the present invention relates to glass for a magnetic recording medium substrate, which comprises essential components in the form of SiO2, Li2O, Na2O, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO wherein a molar ratio of a content of CaO to a combined content of MgO, CaO, SrO, and BaO (CaO/(MgO+CaO+SrO+BaO)) is equal to or less than 0.20, and which has a glass transition temperature of equal to or higher than 650° C.
    Type: Application
    Filed: March 15, 2013
    Publication date: December 26, 2013
    Applicant: HOYA CORPORATION
    Inventor: HOYA CORPORATION
  • Patent number: 8599652
    Abstract: A thermally-assisted magnetic recording (TAMR) medium of the present invention includes: a magnetization direction arrangement layer on a substrate; and a magnetic recording layer on the magnetization direction arrangement layer, wherein the magnetization direction arrangement layer is made of at least one selected from a group consisting of Co, Zr, CoZr, CoTaZr, CoFeTaZrCr, CoNbZr, CoNiZr, FeCoZrBCu, NiFe, FeCo, FeAlN, (FeCo)N, FeAlSi, and FeTaC so that a spreading of the heating spot applied from the magnetic head for thermally-assisted recording to the film surface of the magnetic recording medium is suppressed, and that an SN is improved by arranging the magnetization direction of the perpendicularly written recording magnetization to become identical to a perpendicular direction, and realizing the higher recording density.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: December 3, 2013
    Assignee: TDK Corporation
    Inventors: Satoshi Tomikawa, Tomohito Mizuno
  • Publication number: 20130315045
    Abstract: A system comprises a writer to form a plurality of color mits on a base material, wherein at least one of the color mits may represent computer-readable instructions comprising data other than pixel-image data. The plurality of color mits may include a first color mit and a second color mit, wherein the first color mit represents information data, and the second color mit represents that the first color mit contains a particular type of information data. The system also may include a reader to read colors of the plurality of color mits on the base material. The system may comprise a device to map at least one of the color mits to computer-readable instructions. The system may further comprise a processor configured to transmit signals using a colored light.
    Type: Application
    Filed: February 3, 2012
    Publication date: November 28, 2013
    Inventors: Lucinda Price, Joseph Auciello, Charles Price, Stanley Jacobson
  • Patent number: 8593797
    Abstract: A display device includes a display portion, a cantilever, a rotating disc unit, a base, and two cables. The cantilever has an upper end connected with the display portion, allowing the display portion to rotate relative to the cantilever about a first axis. The rotating disc unit is connected with a bottom of the cantilever, allowing the cantilever to pivot relative to the rotating disc unit about a second axis, which is parallel with the first axis. The base is connected to the rotating disc unit in a manner allowing the same to rotate relative to the base about a third axis, which is vertical to the first and second axes. The cables extend downward from the display portion along the cantilever and are inserted into the rotating disc unit. The cables enter the base after being placed adjacent to one another within the rotating disc unit.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: November 26, 2013
    Assignee: Quanta Computer Inc.
    Inventors: Ming-Li Chien, Yu-Tsung Tsai, Chang-Ying Sung
  • Patent number: 8576671
    Abstract: A TAMR (thermal assisted magnetic recording) equipped DFH (dynamic flying height) type slider ABS design, when operating in a HDD (hard disk drive) produces exceptional low pressure/stiffness for improved touch down detection and back-off efficiency as well as wear and damage reduction due to the improved capabilities as well as reduction in heat transfers. The supplementation of the slider with multiple heaters, three herein, disposed about the write-head in the cross-track direction provides the slider with enhanced dynamic stability that would normally not be achievable with the exceptional low pressure/stiffness.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: November 5, 2013
    Assignees: SAE Magnetics (H.K) Ltd., Headway Technologies, Inc.
    Inventors: Ellis Cha, Ben Kwun Pan Ng
  • Publication number: 20130286800
    Abstract: A flex circuit including a dual sided interconnect structure to connect electrical components on a head or suspension assembly to head circuitry is described. The dual sided interconnect structure described has application for providing an electrical connection to one or more transducer elements on a slider and one or more elements of a heat assisted magnetic recording HAMR unit. In an illustrated embodiment, a flexible structure or insulating base layer includes one or more slider and heat assisted magnetic recording traces coupled to one or more slider or HAMR bond pads on an interconnect portion. As disclosed, the slider bond pads are on the obverse side of the flexible structure and the HAMR bond pads include a reverse side bonding surface to form reverse side bond pads to connect to one or more electrical or heating elements on the HAMR unit.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 31, 2013
    Applicant: Seagate Technology LLC
    Inventors: Bradley J. Ver Meer, Ravishankar Ajjanagadde Shivarama
  • Publication number: 20130286799
    Abstract: An apparatus that includes a near field transducer, the near field transducer including silver (Ag) and at least one other element or compound, wherein the at least one other element or compound is selected from: copper (Cu), palladium (Pd), gold (Au), zirconium (Zr), zirconium oxide (ZrO), platinum (Pt), geranium (Ge), nickel (Ni), tungsten (W), cobalt (Co), rhodium (Rh), ruthenium (Ru), tantalum (Ta), chromium (Cr), aluminum (Al), vanadium (V), iridium (Ir), titanium (Ti), magnesium (Mg), iron (Fe), molybdenum (Mo), silicon (Si), or combinations thereof oxides of V, Zr, Mg, calcium (Ca), Al, Ti, Si, cesium (Ce), yttrium (Y), Ta, W or thorium (Th), Co, or combinations thereof; or nitrides of Ta, Al, Ti, Si, indium (In), Fe, Zr, Cu, W, boron (B), halfnium (Hf), or combinations thereof.
    Type: Application
    Filed: March 12, 2013
    Publication date: October 31, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Meng Zhu, Tong Zhao, Steven C. Riemer, Michael C. Kautzky
  • Publication number: 20130286801
    Abstract: A flex circuit including a multiple layer structure is disclosed. The multiple layered structure includes a first or top layer and a second or base layer. Top traces and bond pads are fabricated on the top or obverse layer and interlayer traces and bond pads are fabricated between the first and second layers to provide an electrical interconnect to electrical components on a head assembly. In an illustrated embodiment, the flex circuit includes portions including the first or base layer and the second or top layer and one or more reduced thickness portion including the first or base layer and not the second layer.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 31, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Ravishankar Ajjanagadde Shivarama, Bradley J. Ver Meer, Razman Zambri
  • Patent number: 8570842
    Abstract: Instead of using discontinuous step functions or pulses to drive a laser of a TAR enabled disk drive between on and off, a fixed modulation frequency may be used that alternates between a high and low laser power such that the radiation source is always delivering heat to the magnetic media when writing data to the magnetic disk. The magnetic field of the write pole may be synchronized to the modulation frequency of the radiation source to ensure that the radiation source heats the magnetic media proximate to the write pole above the grain freezing temperature when the Zeeman energy produced by the magnetic field of the write pole exceeds the thermal energy of the magnetic media.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: October 29, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Hans J. Richter, Erhard Schreck, Matteo Staffaroni, Barry C. Stipe
  • Publication number: 20130279311
    Abstract: A heat assisted magnetic recording (HAMR) assembly includes a slider, a laser diode and solder connections between the laser diode and the slider. The solder connections mechanically and electrically attach the laser diode to the slider. Each solder connection has a total volume per unit area (i.e., height) of less than or equal to about 15 ?m. The solder connections have a first intermetallic zone adjacent to the laser diode, a second intermetallic zone adjacent to the slider, and a eutectic zone of eutectic material between the first and second intermetallic zones. The eutectic zone occupies greater than or equal to about 35% of the total volume per unit area of the solder connection.
    Type: Application
    Filed: March 12, 2013
    Publication date: October 24, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Jon Paul Hurley, Bernard W. Bell, Jr., Steven Harlow Anderson Axdal
  • Publication number: 20130279312
    Abstract: Magnetic write heads for heat-assisted magnetic recording (HAMR) are disclosed that include a laser diode having a light emitting edge or surface mounted on a slider, an optical waveguide, and a printed bonding agent disposed in an air gap between the laser diode and the slider. The printed bonding agent can be applied by ink jet printing or aerosol jet printing. Also included is a method that includes attaching a laser diode to a slider of a magnetic write head and depositing a bonding agent into the air gap using a focused stream of bonding agent. A light-emitting edge or surface of the laser diode is adjacent to an optical waveguide. The light-emitting edge or surface of the laser diode and the optical input of the waveguide define an aligned direction and an air gap extends from the light-emitting edge or surface of the laser diode in a direction perpendicular to the aligned direction. The bonding agent can be applied by ink jet printing or aerosol jet printing.
    Type: Application
    Filed: March 13, 2013
    Publication date: October 24, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Jon Paul Hurley, Jason Boyd Elledge
  • Publication number: 20130279310
    Abstract: In accordance with one embodiment, a method is disclosed that comprises disposing an antireflection material in juxtaposition with a top surface of a slider. In accordance with another embodiment, a method is disclosed that comprises disposing an antireflective material between a facet edge of a laser and an incident surface of a waveguide. In yet another embodiment, an apparatus is disclosed that comprises a slider and an antireflection material in juxtaposition with a top surface of the slider.
    Type: Application
    Filed: March 4, 2013
    Publication date: October 24, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Lijuan Zhong, Scott Olson
  • Patent number: 8565047
    Abstract: Various embodiments of the present invention provide systems and methods for data writing. As an example, a heat assisted loopback circuit is discussed that includes: a read circuit, a magnetic write circuit, a heat write circuit, and a loopback circuit. The read circuit is operable to sense data from a storage medium, and to provide the sensed data as a read output. The magnetic write circuit is operable to provide a write output corresponding to an excitation signal of a write head. The heat write circuit is operable to provide a heat output corresponding to an excitation signal of a heat source. The loopback circuit is operable to selectively couple a derivative of the heat output to the read output and to selectively couple a derivative of the write output to the read output.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: October 22, 2013
    Assignee: LSI Corporation
    Inventor: Ross S. Wilson
  • Patent number: 8558418
    Abstract: A voice coil motor (VCM) includes a lens carrier physically connected to a magnetic device, an electromagnetic driving apparatus, constructed by a coil, a magnetic sensing element, a storage media and a controller. The magnetic sensing element detects a location of the lens carrier and outputs the location value relating to the location of the lens carrier via an amplifier. The storage media stores a gain value and an offset compensation value relating to the amplifier. The controller can make the lens carrier move between a top position and a bottom position in which the lens carrier can be moved within the voice coil motor. The lens carrier is moved using the coil interaction with a magnetic field of the magnetic device when current is applied to the coil.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: October 15, 2013
    Assignee: Vasstek International Corp.
    Inventor: Ching-Lung Tsai
  • Patent number: 8537643
    Abstract: A manufacturing method of a light source chip for a thermally assisted head comprises steps of (a) providing a light source bar with a surface coating formed thereon; (b) forming several blind holes on the predetermined positions of the light source bar by etching, the blind hole having a top hollowed on the surface coating and a bottom hollowed on the light source bar, and the blind hole having a first biggest width at its top; (c) cutting the light source bar along every two adjacent blind holes by a cutting machine. The cutting machine has a cutting means with a second biggest width that is smaller than the first biggest width of the blind hole, thereby cutting down an individual light source chip without contacting the side edges of the blind hole.
    Type: Grant
    Filed: November 25, 2011
    Date of Patent: September 17, 2013
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Ryuji Fujii, Tai Boon Lee, Hideki Tanzawa, Yasuhiro Konakawa
  • Publication number: 20130229895
    Abstract: A microwave assisted magnetic recording head includes a recording magnetic pole unit that produces a recording field for writing to a perpendicular magnetic recording medium, and a high-frequency magnetic field oscillator that produces a high-frequency magnetic field. The recording magnetic pole unit includes a magnetic core with a write gap portion at which a main recording field component is concentrated, and the high-frequency magnetic field oscillator is disposed in the write gap.
    Type: Application
    Filed: February 8, 2013
    Publication date: September 5, 2013
    Applicant: HITACHI, LTD.
    Inventors: Yoshihiro SHIROISHI, Hiroshi FUKUDA, Harukazu MIYAMOTO, Junko USHIYAMA, Katsuro WATANABE, Yoshiyuki HIRAYAMA, Masukazu IGARASHI
  • Patent number: 8509039
    Abstract: A thermally-assisted recording (TAR) disk has an improved insulating layer beneath the chemically-ordered FePt (or CoPt) alloy recording layer. The insulating layer is a solid substitution crystalline alloy MgXO, where the element X is selected from nickel (Ni) and cobalt (Co). The composition of the MgXO crystalline solid substitutional alloy is of the form (Mg(100-y)Xy)O where y is between 10 and 90, and more preferably between 20 and 80. An optional layer of crystalline “pure” MgO may be located between the MgXO layer and the FePt recording layer and in contact with the recording layer, or between an underlayer and the MgXO layer.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: August 13, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Lidu Huang, Andrew Thomas McCallum, Simone Pisana
  • Patent number: 8498182
    Abstract: The presented embodiments generally relate to designing an antenna of an optical transducer (e.g., a near-field transducer or near-field optical source) that focuses the optical energy of a radiation source (e.g., a laser) onto a magnetic media, thereby heating the media. Specifically, the antenna is designed to wrap-around an aperture of the optical transducer such that at least a portion of the antenna is between a main pole of a write head and a surface of the aperture that faces the main pole. Moreover, the antenna may wrap-around the aperture such that it directly contacts the main pole.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: July 30, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Hamid Balamane, Jordan A. Katine, Neil L. Robertson, Matteo Staffaroni, Barry C. Stipe
  • Publication number: 20130188463
    Abstract: A method performed by a disk drive, comprising: receiving a plurality of signal samples over a channel in the disk drive; executing a forward pattern-dependent noise prediction (PDNP) operation on the plurality of the signal samples; generating, based on execution of the forward PDNP operation, a first detection of recorded data bits in the plurality of received signal samples; executing a backward PDNP operation on the plurality of the received signal samples; generating, based on execution of the backward PDNP operation, a second detection of recorded data bits in the plurality of received signal samples; comparing the first detection to the second detection; identifying, based on comparing, one or more erasures in the received plurality of signal samples; and generating one or more sequences of bits that promote correction of the one or more erasures.
    Type: Application
    Filed: January 18, 2013
    Publication date: July 25, 2013
    Inventors: Yibin Ng, Vijayakumar Bhagavatula, Cai Kui
  • Patent number: 8483019
    Abstract: A magneto-optical device (MOD) with optically induced magnetization for use in magnetic field sensors as a magnetic element pinning a magnetization in a preferred direction of a ferromagnetic layer as well as a magnetic memory cell for magneto-optical recording. The MOD comprises the Mg—Mg—Co ferrite film deposited on a magnesium oxide (MgO) substrate. The ferrite film is illuminated at room temperature with a circularly polarized light (CPL) in a static magnetic H-field (about of 3 kOe) normal to the illuminated ferrite film surface. At certain (“writing”) combinations of H, sigma (CPL helicity), the long-lived optically induced magnetization with a unidirectional anisotropy, stable to a conventional demagnetization occurs. For readout of information, conventional magnetoresistive sensors and MFM can be used. To erase information, the ferrite film should be illuminated with two field-light combinations, other than “writing”, or annealed at temperature higher than 530 degrees C.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: July 9, 2013
    Inventors: Esfir Z. Katsnelson, Mark M. Chervinsky