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公开(公告)号：US20240417837A1
公开(公告)日：2024-12-19
申请号：US18819375
申请日：2024-08-29
Applicant: UACJ Corporation , Furukawa Electric Co., Ltd.
Inventor： Kotaro KITAWAKI , Yuma KOKUBUN , Ryo SAKAMOTO , Hideyuki HATAKEYAMA
Abstract: An example method for producing an aluminum alloy raw material, wherein in a separation step of reusing, as a recycled material, at least one of an intermediate material and a finished product each comprising an aluminum alloy disk and an underlayer, for at least part of an aluminum alloy material and heating the aluminum alloy material comprising the recycled material to separate the aluminum alloy disk and the underlayer, and the aluminum alloy material comprising the recycled material is heated and held at 480° C. or higher and 590° C. or lower for more than 1 hour.
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公开(公告)号：US20240005958A1
公开(公告)日：2024-01-04
申请号：US18252076
申请日：2021-11-11
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Naoki KITAMURA , Kotaro KITAWAKI , Hideyuki HATAKEYAMA , Ryohei YAMADA , Toshihiro NAKAMURA
IPC: G11B17/038 , G11B5/02
CPC classification number: G11B17/038 , G11B5/02 , G11B2005/0021
Abstract: A hard disk drive is a 3.5-inch hard disk drive on which a magnetic disk formed of an aluminum alloy substrate is mounted. A thickness Td of each of magnetic disks that are arranged in a stacked manner is 0.3 mm or more and 0.6 mm or less, the number N of the magnetic disks is 10 or more and 16 or less, and an outer diameter 2Rso of a spacer that is arranged between the magnetic disks is 35 mm or more and 65 mm or less. The outer diameter 2Rso (mm) of the spacer satisfies 2Rso≥−60Td+70 and 2Rso≤−0.5N2+16.5N−73.
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公开(公告)号：US20210319806A1
公开(公告)日：2021-10-14
申请号：US17284187
申请日：2019-10-15
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Yu IGARASHI , Keisuke KAMIYA , Yu MATSUI , Makoto YONEMITSU , Ryo SAKAMOTO , Hideyuki HATAKEYAMA , Hiroki OTA
Abstract: An aluminum alloy sheet for a magnetic disk, a method for manufacturing same, and a magnetic disk using same. The aluminum alloy sheet is made of an aluminum alloy comprising 0.10 to 3.00 mass % of Fe, 0.003 to 1.000 mass % of Cu, and 0.005 to 1.000 mass % of Zn, with a balance of Al and unavoidable impurities, wherein a value obtained by dividing a difference in an area ratio (%) of second phase particles between a region (A) and a region (B) by an average value of area ratios (%) of second phase particles in the regions (A) and (B) is 0.05 or less, the region (A) being a region from a sheet thickness center plane to a front surface of the sheet, and the region (B) being a region from the sheet thickness center plane to a rear surface of the plate.
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公开(公告)号：US20240355357A1
公开(公告)日：2024-10-24
申请号：US18757992
申请日：2024-06-28
Applicant: FURUKAWA ELECTRIC CO., LTD. , UACJ Corporation
Inventor： Hideyuki HATAKEYAMA , Shimpei TODO , Kotaro KITAWAKI , Koichiro TAKIGUCHI
CPC classification number: G11B5/73921 , G11B5/7358
Abstract: A magnetic disk substrate having a pair of front and back principal surfaces, containing fixed portions that are in contact with fixing jigs when the magnetic disk substrate configured as a magnetic disk is incorporated in a hard disk device on the respective front and back principal surfaces, wherein a root mean square deviation Rq of surface roughnesses of the fixed portions on the respective front and back principal surfaces is from 0.01 to 0.44 μm.; and
a magnetic disk using the same.-
公开(公告)号：US20240170017A1
公开(公告)日：2024-05-23
申请号：US18547621
申请日：2022-02-14
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Ryohei YAMADA , Shinpei TODO , Hideyuki HATAKEYAMA
IPC: G11B17/038 , G11B5/82
CPC classification number: G11B17/038 , G11B5/82
Abstract: A magnetic disk device includes a plurality of disk-shaped magnetic disks, a spacer, a hub, and a clamp. Each of the magnetic disks includes a through-hole in a center section thereof. The spacer is disposed among the magnetic disks, and includes a through-hole in a center section thereof. The hub is inserted into the through-holes of the magnetic disks and the spacers. The clamp presses and holds the magnetic disks and the spacer. At surfaces where the magnetic disks and the spacer or the clamp contact, a flat surface height of an upper surface of at least one magnetic disk that contacts an outer circumference of the spacer or the clamp is lower than a flat surface height of the upper surface of at least one magnetic disk of the magnetic disks that contacts an inner circumference of the spacer or the clamp.
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Patent Agency Ranking
公开(公告)号：US20240135971A1
公开(公告)日：2024-04-25
申请号：US18547728
申请日：2022-02-28
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Shinpei TODO , Ryohei YAMADA , Hideyuki HATAKEYAMA
IPC: G11B19/20
CPC classification number: G11B19/2045
Abstract: A magnetic disk device includes a plurality of disk-shaped magnetic disks 30, spacers 80, a hub 90, a clamp 70, and a fastening member 72. Each of the magnetic disks 30 includes a through-hole in a center section thereof. Each of the spacers 80 includes a through-hole in a center section thereof, and is disposed among the magnetic disks 30. The hub 90 is inserted into the through-holes of the magnetic disks 30 and the spacers 80. The clamp 70 presses and holds the magnetic disks 30 and the spacers 80. The fastening member 72 fastens the clamp 70 to the hub 90. The clamp 70 is fastened to the hub by the fastening member 72 with a torque of from 5 cN·m to 45 cN·m.
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公开(公告)号：US20210050034A1
公开(公告)日：2021-02-18
申请号：US16979023
申请日：2018-11-28
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Takuya MURATA , Kotaro KITAWAKI , Makoto YONEMITSU , Yasuo FUJII , Ryo SAKAMOTO , Hideyuki HATAKEYAMA , Sadayuki TODA
Abstract: A magnetic disk substrate is composed of an aluminum alloy substrate, a base plating layer on a surface of the aluminum alloy substrate, and a boundary region between the aluminum alloy substrate and the base plating layer. The boundary region includes a specific boundary region (D(1)I((50-84)) having A, emission intensities equal to 50% to 84% of an average Al emission intensity in an interior region of the aluminum alloy substrate in glow discharge optical emission spectroscopy in the depthwise direction from the surface of the magnetic disk substrate. The specific boundary region (D(1)I(50-84)) has a maximum Fe emission intensity (I(1)Fe(max)) higher than an average Fe emission intensity (I(1)Fe(ave)) in the interior region of the aluminum alloy substrate in the glow discharge optical emission spectroscopy.
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公开(公告)号：US20200381015A1
公开(公告)日：2020-12-03
申请号：US16969847
申请日：2019-02-06
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Makoto YONEMITSU , Hideyuki HATAKEYAMA , Takashi NAKAYAMA , Yasuo FUJII , Ryo SAKAMOTO
Abstract: Provided is an aluminum alloy substrate for a magnetic disk that includes an aluminum alloy containing 0.4 to 3.0 mass % (hereinafter abbreviated as “%”) of Fe, 0.005% to 1.000% of Cu, and 0.005% to 1.000% of Zn, with a balance of Al and unavoidable impurities. This substrate has a ratio A/B of 0.70 or more, where A indicates a distribution density of Al—Fe intermetallic compound particles having maximum diameters of 10 μm or more and less than 16 μm, and B indicates a distribution density of Al—Fe intermetallic compound particles having maximum diameters of 10 μm or more. The distribution density of Al—Fe intermetallic compound particles having maximum diameters of 40 μm or more is at most one per square millimeter. Also provided are a method of fabricating this aluminum alloy substrate for a magnetic disk and a magnetic disk composed of the aluminum alloy substrate for a magnetic disk.
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公开(公告)号：US20190390304A1
公开(公告)日：2019-12-26
申请号：US16482113
申请日：2018-01-30
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Takuya MURATA , Kotaro KITAWAKI , Makoto YONEMITSU , Naoki KITAMURA , Takashi NAKAYAMA , Hideyuki HATAKEYAMA , Ryo SAKAMOTO , Sadayuki TODA
Abstract: There are provided: an aluminum alloy magnetic disk substrate including: an aluminum alloy base material including an aluminum alloy containing 0.4 to 3.0 mass % (hereinafter, simply referred to as “%”) of Fe, 0.1 to 3.0% of Mn, 0.005 to 1.000% of Cu, and 0.005 to 1.000% of Zn, with the balance of Al and unavoidable impurities; and an electroless Ni—P plated layer formed on a surface of the aluminum alloy base material, in which the peak value (BLEI) of Fe emission intensity at an interface between the electroless Ni—P plated layer and the aluminum alloy base material, as determined by a glow discharge optical emission spectrometry device, is lower than Fe emission intensity (AlEI) in the interior of the aluminum alloy base material, as determined by the glow discharge optical emission spectrometry device; and a method for producing the aluminum alloy magnetic disk substrate.
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10.发明公开公开(公告)号：US20240119967A1
公开(公告)日：2024-04-11
申请号：US18303899
申请日：2023-04-20
Applicant: UACJ Corporation , Furukawa Electric Co., Ltd.
Inventor： Kotaro KITAWAKI , Hideyuki HATAKEYAMA , Wataru KUMAGAI , Ryo SAKAMOTO
Abstract: An example thin substrate built-in hard disk drive includes a magnetic disk in a disk shape having a through-hole at the center, a spindle motor inserted into the through-hole of the magnetic disk and co-rotatably supporting the magnetic disk, and a base plate made of an aluminum alloy and supporting the spindle motor. The base plate has a metallographic structure in which a perimeter of a second phase particle having a longest diameter of 10 μm or more is 3 mm/mm2 or more, and the number of second phase particles having a longest diameter of 500 μm or more is 0 particles/mm2.
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