公开(公告)号：US11968781B2

公开(公告)日：2024-04-23

申请号：US17899385

申请日：2022-08-30

Applicant: KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION

Inventor： Kazuyoshi Akutsu

IPC: H05K1/11 ,  G11B5/82 ,  H05K1/02

CPC classification number: H05K1/111 ,  G11B5/82 ,  H05K1/0295 ,  H05K2201/09954

Abstract: According to one embodiment, a printed circuit board includes a substrate and a shared pad group provided on the substrate and including a plurality of shared pads. The shared pads include a first area, a second area smaller in size than the first area, a port of which is overlap the first area and an other port of which is located to protrude from the first area to a side of another one of the shared pads, and a second side edge located on a side of another shared pad. The second pad side edge includes a first side edge defining the first area, a second side edge defining the second area and displaced on a side of another shared pad with respect to the first side edge, and a sloping side edge connecting the first side edge and the second side edge to each other.

公开(公告)号：US11866548B2

公开(公告)日：2024-01-09

申请号：US17629165

申请日：2020-06-29

Applicant: Moresco Corporation

Inventor： Ryosuke Sagata ,  Tsuyoshi Shimizu

IPC: C08G65/00 ,  G11B5/725 ,  C10M105/54 ,  C10M107/34 ,  C10M107/38 ,  G11B5/82 ,  C10N40/18

CPC classification number: C08G65/007 ,  C10M105/54 ,  C10M107/34 ,  C10M107/38 ,  G11B5/7257 ,  G11B5/82 ,  C08G2650/38 ,  C08G2650/48 ,  C10M2211/0425 ,  C10M2213/043 ,  C10M2213/0606 ,  C10N2040/18

Abstract: Provided is a compound with which a lubricant having excellent adhesion to a magnetic disk, particularly to a protective layer can be provided. A perfluoropolyether compound in accordance with one aspect of this invention has a structure in which two perfluoropolyethers are bonded to each other through an aliphatic ether, the aliphatic ether including a carbon atom to which a primary alcohol is bonded.

公开(公告)号：US20230197111A1

公开(公告)日：2023-06-22

申请号：US18165295

申请日：2023-02-06

Applicant: Masanobu ITAYA ,  Kinobu OSAKABE ,  Toshio TAKIZAWA

Inventor： Masanobu ITAYA ,  Kinobu OSAKABE ,  Toshio TAKIZAWA

IPC: G11B5/82 ,  G11B5/73 ,  G11B5/667

CPC classification number: G11B5/82 ,  G11B5/73921 ,  G11B5/667

Abstract: A magnetic-disk substrate has an average value of squares of inclinations that is 0.0025 or less, and a frequency at which squares of inclinations are 0.004 or more is 15% or less, in a case where samples of inclinations on a main surface are obtained at intervals of 10 nm. The main surface is configured to receive at least a magnetic recording layer thereon. The magnetic-disk substrate includes an outer circumferential end portion and an inner circumferential end portion, and the outer circumferential end portion and the inner circumferential end portion have chamfered portions.

公开(公告)号：US11664050B2

公开(公告)日：2023-05-30

申请号：US17543441

申请日：2021-12-06

Applicant: Western Digital Technologies, Inc.

Inventor： Shoji Suzuki ,  Kirk B. Cheng

IPC: G11B5/84 ,  G11B23/00 ,  G11B5/82

CPC classification number: G11B5/8404 ,  G11B5/82 ,  G11B23/0021

Abstract: A disk for a magnetic recording apparatus is described. The disk includes a first surface extending along a first plane, a second surface extending along a second plane parallel to the first plane, and a disk thickness between the first surface and the second surface, measured along a first direction substantially normal to the first surface. The disk further includes an edge surface disposed along a perimeter of the disk and between the first surface and the second surface, where the edge surface extends along a third plane substantially perpendicular to the first surface, a first chamfer disposed between the first surface and the edge surface, and a second chamfer disposed between the second surface and the edge surface. In an aspect, a length of the edge surface measured along the first direction may be between 40% and 80% of the disk thickness.

公开(公告)号：US20190251993A1

公开(公告)日：2019-08-15

申请号：US16395850

申请日：2019-04-26

Applicant: HOYA CORPORATION

Inventor： Masanobu ITAYA ,  Kinobu OSAKABE

IPC: G11B5/82 ,  G11B5/84

CPC classification number: G11B5/82 ,  B82Y10/00 ,  B82Y40/00 ,  G11B5/73 ,  G11B5/7315 ,  G11B5/84 ,  G11B5/8404

Abstract: A magnetic-disk substrate has a pair of main surfaces, and an arithmetic average roughness Ra of each of the main surfaces is 0.11 nm or less. The arithmetic average roughness Ra is a value obtained through measurement using an atomic force microscope provided with a probe having a probe tip provided with a carbon nanofiber rod-shaped member. The magnetic-disk substrate is made of glass or aluminum alloy.

公开(公告)号：US09940963B1

公开(公告)日：2018-04-10

申请号：US15354980

申请日：2016-11-17

Applicant: Western Digital Technologies, Inc.

Inventor： Kai Tang

IPC: G11B5/708 ,  G11B5/84 ,  G11B5/712 ,  G11B5/72 ,  G11B5/65 ,  C23C14/48 ,  G11B5/82

CPC classification number: G11B5/708 ,  C23C14/48 ,  G11B5/65 ,  G11B5/712 ,  G11B5/72 ,  G11B5/82 ,  G11B5/84 ,  G11B5/8408

Abstract: A method for manufacturing a magnetic media for magnetic data recording that improves smoothness for reduced magnetic spacing, and also improves mechanical integration to improve reliability and lifespan of the data recording system. A magnetic material such as a magnetic recording layer is deposited over underlying layers that include a substrate. A first etching is performed that employs a Xe plasma. A second etching is then performed that employs an Ar plasma. The two step etching process advantageously improves smoothness of the surface of the magnetic layer which allows for a thinner overcoat for reduced magnetic spacing. The two step etching process also results in less head disk crashes, resulting in improved reliability.

公开(公告)号：US20170365288A1

公开(公告)日：2017-12-21

申请号：US15627124

申请日：2017-06-19

Applicant: Applied Materials, Inc.

Inventor： Majeed A. Foad ,  Jacob Newman ,  Jose Antonio Marin ,  Daniel J. Hoffman ,  Stephen Moffatt ,  Steven Verhaverbeke

IPC: G11B5/82 ,  C23C16/00 ,  C23F1/00 ,  H01L21/673 ,  G11B5/855 ,  G11B5/84 ,  H01L21/677 ,  H01L21/687 ,  C23C14/48 ,  C23C14/50

CPC classification number: G11B5/82 ,  C23C14/48 ,  C23C14/50 ,  C23C16/00 ,  C23F1/00 ,  G11B5/84 ,  G11B5/855 ,  H01L21/673 ,  H01L21/677 ,  H01L21/687

Abstract: Methods and apparatus for forming substrates having magnetically patterned surfaces is provided. A magnetic layer comprising one or more materials having magnetic properties is formed on a substrate. The magnetic layer is subjected to a patterning process in which selected portions of the surface of the magnetic layer are altered such that the altered portions have different magnetic properties from the non-altered portions without changing the topography of the substrate. A protective layer and a lubricant layer are deposited over the patterned magnetic layer. The patterning is accomplished through a number of processes that expose substrates to energy of varying forms. Apparatus and methods disclosed herein enable processing of two major surfaces of a substrate simultaneously, or sequentially by flipping. In some embodiments, magnetic properties of the substrate surface may be uniformly altered by plasma exposure and then selectively restored by exposure to patterned energy.

公开(公告)号：US09842612B2

公开(公告)日：2017-12-12

申请号：US12571959

申请日：2009-10-01

Applicant: Mark Anthony Gubbins ,  Robert William Lamberton ,  Robert Edward Weinstein ,  James Joseph Touchton

Inventor： Mark Anthony Gubbins ,  Robert William Lamberton ,  Robert Edward Weinstein ,  James Joseph Touchton

IPC: G11B5/09 ,  G11B5/02 ,  B82Y10/00 ,  G11B5/31 ,  G11B5/74 ,  G11B20/10 ,  G11B5/82 ,  G11B5/00

CPC classification number: G11B5/02 ,  B82Y10/00 ,  G11B5/3133 ,  G11B5/746 ,  G11B5/82 ,  G11B20/10009 ,  G11B20/10222 ,  G11B20/1024 ,  G11B20/10388 ,  G11B20/10425 ,  G11B2005/0005 ,  G11B2220/252

Abstract: The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal.

公开(公告)号：US20170206919A1

公开(公告)日：2017-07-20

申请号：US15476466

申请日：2017-03-31

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Akira Furuta ,  Hiroto Kikuchi ,  Hiroyasu Kataoka ,  Takehito Shimatsu

IPC: G11B5/66 ,  C23C14/14 ,  G11B5/851 ,  G11B5/65 ,  G11B5/82

CPC classification number: G11B5/66 ,  C23C14/14 ,  C23C14/185 ,  C23C14/34 ,  G11B5/653 ,  G11B5/656 ,  G11B5/82 ,  G11B5/851

Abstract: The purpose of the present invention is to provide a magnetic recording medium making secondary growth of magnetic crystal grains inhibited, having a magnetic recording layer having a large film thickness, and exhibiting excellent magnetic characteristics, and to provide a method for producing the medium. A magnetic recording medium according to the present invention includes a substrate and a magnetic recording layer that includes a lower layer and an upper layer, in which the lower layer and the upper layer include magnetic crystal grains formed of an ordered alloy and non-magnetic grain boundaries, the lower layer is formed by depositing Bi, C and an element constituting the ordered alloy, and the upper layer is formed by depositing C and an element constituting the ordered alloy. The present invention also provides a method for producing the above-described magnetic recording medium.

公开(公告)号：US09704524B2

公开(公告)日：2017-07-11

申请号：US15084828

申请日：2016-03-30

Applicant: FUJIFILM Corporation

Inventor： Masahide Sato

IPC: G11B5/708 ,  G11B5/714 ,  G11B5/82 ,  G11B5/733

CPC classification number: G11B5/708 ,  G11B5/714 ,  G11B5/733 ,  G11B5/82

Abstract: The magnetic recording medium has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a thickness of the nonmagnetic layer ranges from 0.10 to 0.60 μm; and the magnetic layer further contains nonmagnetic filler satisfying equation 1 below and having a Vickers hardness of less than or equal to 122 N/mm2: 1.150≦D2/D1≦1.300  Equation 1: wherein, in equation 1, D1 is a value, with a unit of μm, obtained from equation 2 below: D ⁢ ⁢ 1 = 6 ρ · S , Equation ⁢ ⁢ 2 D2 is an average particle size, with a unit of μm, of the nonmagnetic filler, and in equation 2, ρ denotes a density, with a unit of g/cm3, of the nonmagnetic filler and S denotes a specific surface area, with a unit of m2/g, of the nonmagnetic filler.