Patents Examined by Tan X Dinh
  • Patent number: 11227633
    Abstract: A recording head includes a channel waveguide that delivers light to a media-facing surface. A near-field transducer (NFT) is at an end of the channel waveguide and proximate to the media-facing surface. A laser including an active region has a longitudinal axis corresponding to a propagation direction of the channel waveguide. The active region includes a back facet and a front facet proximate the NFT. The front facet has a surface shape configured to suppress back reflection of the light.
    Type: Grant
    Filed: October 28, 2020
    Date of Patent: January 18, 2022
    Assignee: Seagate Technology LLC
    Inventors: Aidan Dominic Goggin, John Moloney, Reyad Mehfuz, Chuan Zhong, Christopher Neil Harvey
  • Patent number: 11222657
    Abstract: A recording head has a waveguide that delivers optical energy from an energy source and a write pole extending to a media-facing surface of the recording head. The recording head also has a near-field transducer coupled to receive the optical energy from the waveguide and emit surface plasmons from the media-facing surface towards a recording medium while the write pole applies a magnetic field to the recording medium. The near-field transducer has an extended portion that, as-manufactured, protrudes beyond the media-facing surface by a first distance.
    Type: Grant
    Filed: December 30, 2020
    Date of Patent: January 11, 2022
    Assignee: Seagate Technology LLC
    Inventors: Michael A. Seigler, Peng Zhang, David James Ellison, James D. Kiely, Edwin F. Rejda
  • Patent number: 11222665
    Abstract: A servo writer includes a writing head that writes a servo signal on a long magnetic tape that is traveling and at least two first guide rollers that guide the travel of the magnetic tape, in which the at least two first guide rollers on which a spiral groove is provided have a circumferential surface that has contact with the traveling magnetic tape, tensile forces act on the magnetic tape from the at least two first guide rollers in a width direction of the traveling magnetic tape, and the tensile forces that act on the magnetic tape from the at least two first guide rollers cancel each other.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: January 11, 2022
    Assignee: Sony Corporation
    Inventor: Tetsuo Endo
  • Patent number: 11217273
    Abstract: A recording head includes one or more transducer elements, and an electrically insulative layer encasing the one or more transducer elements. The recording head also includes a substrate below the electrically insulative layer. The recording head further includes a heat sinking layer between the electrically insulative layer and the substrate.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: January 4, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Helene Parwana Habibi, Vasudevan Ramaswamy, Raul H. Andruet, Neil Zuckerman, Frank A. McGinnity, Giovanni A. Badini Confalioneri, Martin L. McGarry, James G. Wessel, Pablo G. Levi
  • Patent number: 11211092
    Abstract: A magnetic tape device (100) includes: a winding reel (101) winding a magnetic tape (201); a drive head (103) performing writing information onto the magnetic tape (201) and/or reading the information recorded on the magnetic tape (201); an image sensor (104) picking up an image of a surface of the magnetic tape (201); and a control unit (105) performing image processing on the image picked up the image sensor (104) and determining presence/absence of an abnormality on the surface of the magnetic tape (201), in which the control unit (105) adjusts, in accordance with at least either one of a type of the drive head (103) and a recording density of the magnetic tape (201), a winding speed at which the magnetic tape (201) is wound by the winding reel (101) when the image sensor (104) picks up the image of the surface of the magnetic tape (201).
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: December 28, 2021
    Assignee: NEC Platforms, Ltd.
    Inventor: Mitsunori Suzuki
  • Patent number: 11211084
    Abstract: A Perpendicular Magnetic Recording (PMR) head is configured for use in Thermally Assisted Magnetic Recording (TAMR). Two or three contiguous write shields, of various widths and thicknesses, formed on a leading edge side of the write gap (WG), main pole (MP) and near-field transducer (NFT), protect the head during write touchdowns (TD) and signal the approach of such a touchdown. Moreover during a write touchdown the contact with the head is restricted to the large write shields, producing a large touchdown area (TDA) and insuring the lifetime of the head.
    Type: Grant
    Filed: October 16, 2020
    Date of Patent: December 28, 2021
    Assignees: SAE Magnetics (H.K.) Ltd., Headway Technologies, Inc.
    Inventors: Qinghua Zeng, Siu Yin Ngan, Ellis Cha, Kowang Liu
  • Patent number: 11211083
    Abstract: Embodiments of the present disclosure generally relate to a write head for a magnetic recording device. The write head includes a spin torque oscillator (STO) that has a seed layer formed on a write pole, a spin polarization layer (SPL) formed on the seed layer, a first spacer layer formed on the SPL, a field generation layer (FGL) formed on the first spacer layer, a second spacer layer formed on the FGL, and a notch formed on the second spacer layer. The FGL and the notch are antiferromagnetically coupled through the second spacer layer and thus increases the FGL angle and improves the write capabilities of the write head.
    Type: Grant
    Filed: June 24, 2020
    Date of Patent: December 28, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Yuankai Zheng, Zheng Gao, Christian Kaiser, Zhitao Diao, Susumu Okamura, James Mac Freitag, Alexander Goncharov
  • Patent number: 11205455
    Abstract: A tape-shaped magnetic recording medium includes a substrate; and a magnetic layer that is provided on the substrate and contains a magnetic powder. An average thickness of the magnetic layer is not more than 90 nm, an average aspect ratio of the magnetic powder is not less than 1.0 and not more than 3.0, the coercive force Hc1 in a vertical direction is not more than 3000 Oe, and the coercive force Hc1 in the vertical direction and a coercive force Hc2 in a longitudinal direction satisfy a relationship of Hc2/Hc1?0.8.
    Type: Grant
    Filed: November 19, 2018
    Date of Patent: December 21, 2021
    Assignee: Sony Corporation
    Inventors: Masaru Terakawa, Minoru Yamaga, Katsunori Maeshima
  • Patent number: 11195547
    Abstract: According to one embodiment, a monitoring unit of a magnetic disk device monitors a supply voltage supplied to a plurality of actuators by a first threshold value at which power supply by back electromotive force of a motor is started, and a second threshold value that is larger than the first threshold value. In a case where the supply voltage is lower than or equal to the second threshold value and is higher than the first threshold value, a controller interrupts execution of processing of reading/writing data to a magnetic disk in at least one of the actuators according to a predetermined condition based on execution status of the processing in the actuators.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: December 7, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Kazuo Chokki
  • Patent number: 11189985
    Abstract: An optoelectronic assembly is disclosed. The disclosed assembly includes one or more lasers formed on a first substrate, and a programmable driver circuit formed on a second substrate configured as an integrated circuit. The first and second substrates are mounted on a third substrate in a stacked arrangement.
    Type: Grant
    Filed: December 6, 2019
    Date of Patent: November 30, 2021
    Assignee: II-VI DELAWARE, INC.
    Inventors: David Allouche, Michael Chu, Brian R. Carey, Jonathan Ashbrook, Anita Chan, Krzysztof Szczerba
  • Patent number: 11189308
    Abstract: A magnetic tape reading apparatus including: a reading head which includes a reading unit disposed at a position corresponding to a single track included in a magnetic tape; a controller which controls the reading unit to read data plural times from a specific range of the single track in a running direction of the magnetic tape by a linear scan method; and a synthesis unit which synthesizes a plurality of reproducing signal sequences obtained by reading data plural times from the specific range by the reading unit.
    Type: Grant
    Filed: March 18, 2020
    Date of Patent: November 30, 2021
    Assignee: FUJIFILM Corporation
    Inventor: Atsushi Musha
  • Patent number: 11183209
    Abstract: A magnetic recording medium in a shape of a tape that is long in a longitudinal direction and is short in a width direction is provided, the medium including: a base material; and a magnetic layer, in which the magnetic layer includes a data band long in the longitudinal direction in which a data signal is to be written, and a servo band long in the longitudinal direction in which a servo signal is written, and in the magnetic layer, a degree of vertical orientation is greater than or equal to 65%, a half width of a solitary waveform in a reproduction waveform of the servo signal is less than or equal to 195 nm, a thickness of the magnetic layer is less than or equal to 90 nm, and a thickness of the base material is less than or equal to 4.2 ?m.
    Type: Grant
    Filed: February 18, 2019
    Date of Patent: November 23, 2021
    Assignee: Sony Corporation
    Inventors: Minoru Yamaga, Tooru Sato, Toshiaki Miura, Takanobu Iwama, Jun Takahashi
  • Patent number: 11183213
    Abstract: The present disclosure provides a tape-shaped magnetic recording medium, including: a base; and a magnetic layer that is provided on the base and contains a magnetic powder, in which an average particle volume V of the magnetic powder is 2,000 nm3 or less, an average thickness of the magnetic recording medium is 5.3 ?m or less, a thermal stability KuV/kBT of the magnetic recording medium is 60 or more, and a ratio Hrp/Hc1 of a residual coercive force Hrp of the magnetic recording medium measured using a pulsed magnetic field to a coercive force Hc1 of the magnetic recording medium in a perpendicular direction is 2.10 or less.
    Type: Grant
    Filed: July 1, 2020
    Date of Patent: November 23, 2021
    Assignee: Sony Corporation
    Inventors: Takashi Kataguchi, Natsuki Ichise, Takeshi Takahashi
  • Patent number: 11183208
    Abstract: A recording device, a control device, a recording method, a recording tape cartridge, and a data recording and reproducing system capable of accurately positioning a data recording and reproducing head are obtained. A recording device includes a recording unit that records information on linearity of a servo signal recorded on a magnetic tape included in a recording tape cartridge on an RFID tag included in the recording tape cartridge.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: November 23, 2021
    Assignee: FUJIFILM CORPORATION
    Inventor: Yoichi Akano
  • Patent number: 11176964
    Abstract: A method for indexing a tape for unmounting from a tape drive is discussed. The method can determine that an update has been made to the tape since it was last mounted. The method can identify a tape head position with respect to the tape, the tape including a data partition and an index partition. The method can identify first position and a second position on the tape. The method can determine first distance, a length of tape between first position and tape head position. The method can determine second distance, a length of tape between first position and second position. The method can determine that first distance is less than second distance. The method can reposition the tape to a primary section and write the metadata index. The method can reposition tape to the second position write a data index beginning at the second position of the data partition.
    Type: Grant
    Filed: October 29, 2020
    Date of Patent: November 16, 2021
    Assignee: International Business Machines Corporation
    Inventors: Tohru Hasegawa, Tsuyoshi Miyamura, Atsushi Abe, Shinsuke Mitsuma, Hiroshi Itagaki, Noriko Yamamoto, Sosuke Matsui
  • Patent number: 11176962
    Abstract: A heat-assisted magnetic recording head includes a slider body having a waveguide that delivers light to a near-field transducer. The waveguide is optically coupled to an input coupler a of the slider body that receives the light. A laser diode is mounted on or in the slider body. The laser diode has an integral exit facet proximate the input coupler. The exit facet has a curved profile that modifies a shape of the light emitted from the exit facet into the input coupler.
    Type: Grant
    Filed: September 10, 2020
    Date of Patent: November 16, 2021
    Assignee: Seagate Technology LLC
    Inventors: Aidan Dominic Goggin, Reyad Mehfuz, John Moloney
  • Patent number: 11170814
    Abstract: The present disclosure relates to pretreating a magnetic recording head. For a HAMR head, a NFT is present. Current can be applied to the NFT to condition the NFT. The current is applied in one of three ways: slowly ramping up the current from a starting level below a level capable of writing data to the optical laser current over a predetermined period of time, applying the current at a fixed value below the optical laser current for the predetermined period of time, or slowly ramping up the current from a starting level below a level capable of writing data to the optical laser current over the predetermined period of time while also intermittently removing the current. By conditioning the NFT in such a manner, the HAMR head can avoid thermal shock and thermal fatigue and thus increase the lifetime of the magnetic media drive.
    Type: Grant
    Filed: June 24, 2020
    Date of Patent: November 9, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Sukumar Rajauria, Oscar Ruiz, Erhard Schreck
  • Patent number: 11171465
    Abstract: A submount includes a substrate, the substrate including: a first surface; a second surface that is perpendicular to the first surface; a third surface that is perpendicular to the first surface and the second surface; a fourth surface that is perpendicular to the first surface and the second surface, and is opposed to the third surface; a fifth surface that is perpendicular to the second surface and the third surface, and is opposed to the first surface; a sixth surface that is opposed to the second surface; a first notch part that is provided in a portion at which the second surface and the third surface are adjacent to each other; and a second notch part that is provided in a portion at which the second surface and the fourth surface are adjacent to each other, the first notch part and the second notch part each having a recessed surface.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: November 9, 2021
    Assignee: NUVOTON TECHNOLOGY CORPORATION JAPAN
    Inventors: Shinichi Ijima, Kazumasa Nagano, Norio Ikedo
  • Patent number: 11162169
    Abstract: Devices having an air bearing surface (ABS), the device including a near field transducer, the near field transducer having a peg and a disc, the peg having a region adjacent the ABS, the peg including a plasmonic material selected from gold (Au), silver (Ag), copper (Cu), ruthenium (Ru), rhodium (Rh), aluminum (Al), or combinations thereof; and at least one other secondary atom selected from germanium (Ge), tellurium (Te), aluminum (Al), antimony (Sb), tin (Sn), mercury (Hg), indium (In), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), silver (Ag), chromium (Cr), cobalt (Co), and combinations thereof, wherein a concentration of the secondary atom is higher at the region of the peg adjacent the ABS than a concentration of the secondary atom throughout the bulk of the peg. Methods of forming NFTs are also disclosed.
    Type: Grant
    Filed: December 24, 2019
    Date of Patent: November 2, 2021
    Assignee: Seagate Technology LLC
    Inventors: Tong Zhao, Michael C. Kautzky, Sarbeswar Sahoo, Justin Brons, Jie Gong, Yuhang Cheng
  • Patent number: 11157364
    Abstract: ECC is used to for controlling errors in blocks of data by including a measure of redundancy within the data for recovering one or more unreadable portions of the data. A codeword includes at least a message and one or more additional ECC blocks. In the event of an unreadable sector, the ECC is decoded and used to recover the erroneous or missing portion(s) of the message. With disc access parallelism, ECCs can now be distributed across data storage surfaces and/or multiple storage platters. Distribution of ECCs increases the likelihood of recovering data from a head failure or from burst errors on a data storage surface and adds the option to decode parity after only 1/n revolutions.
    Type: Grant
    Filed: June 29, 2020
    Date of Patent: October 26, 2021
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: David Andrew Rice, Ajay Narayan Kulkarni, Brian T. Edgar