公开(公告)号：US20220108723A1

公开(公告)日：2022-04-07

申请号：US17275578

申请日：2019-08-29

Applicant: Sony Corporation

Inventor： Hiroto ATAGI ,  Noboru SEKIGUCHI ,  Takashi AIZAWA ,  Tomoe OZAKI ,  Koji SUZUKI ,  Yoichi KANEMAKI ,  Teruo SAI ,  Ryoichi HIRATSUKA ,  Kazuya HASHIMOTO

IPC: G11B5/66 ,  G11B5/706 ,  G11B5/714

Abstract: A tape-like magnetic recording medium includes a reinforced substrate, and a recording layer arranged on the reinforced substrate, and the reinforced substrate includes a substrate that has a first face and a second face opposed to each other, and has an average thickness of 4 μm or smaller, and a metal layer that contains cobalt, arranged on the first face, the reinforced substrate by itself causing thereon a depth of indentation of 0.25 μm or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.

公开(公告)号：US20150279401A1

公开(公告)日：2015-10-01

申请号：US14666540

申请日：2015-03-24

Applicant: SONY CORPORATION

Inventor： Takashi AIZAWA ,  Atsuhiro ABE

IPC: G11B5/65 ,  H01J37/34 ,  H01J37/32 ,  G11B5/667 ,  G11B5/84

CPC classification number: G11B5/656 ,  G11B5/64 ,  G11B5/65 ,  G11B5/667 ,  G11B5/84 ,  G11B5/851 ,  H01J37/32752 ,  H01J37/3408 ,  H01J37/3411

Abstract: A magnetic recording medium including a base material which has flexibility, and a laminated film, in which a variation in magnetic characteristics is within ±10% over a division of 300 m in a longitudinal direction of the base material.

Abstract translation: 包括具有柔性的基材的磁记录介质和层叠膜，其中磁特性的变化在基材的纵向上以300μm的间隔分割在±10％以内。

公开(公告)号：US20180366150A1

公开(公告)日：2018-12-20

申请号：US16052817

申请日：2018-08-02

Applicant: Sony Corporation

Inventor： Takashi AIZAWA ,  Atsuhiro ABE

IPC: G11B5/65 ,  H01J37/34 ,  H01J37/32 ,  G11B5/64 ,  G11B5/84 ,  G11B5/667 ,  G11B5/851

Abstract: A film-forming apparatus and a method for manufacturing a magnetic recording medium are provided. The film-forming apparatus includes a rotating body which moves a base material with a strip shape which has flexibility, a plurality of cathodes which are provided to oppose a rotating surface of the rotating body; and a plurality of accommodating sections which accommodate each of the plurality of cathodes. The method includes sequentially film-forming a plurality of thin films on a base material using a plurality of cathodes which are provided on a moving path of the base material while moving the base material with a strip shape which has flexibility. Each of the plurality of cathodes is accommodated in a plurality of accommodating sections.

公开(公告)号：US20170345453A1

公开(公告)日：2017-11-30

申请号：US15536546

申请日：2015-11-12

Applicant: Sony Corporation

Inventor： Takashi AIZAWA ,  Atsuhiro ABE

IPC: G11B5/851 ,  C23C14/14 ,  C23C14/00 ,  C23C14/08 ,  G11B5/65 ,  C23C14/54

CPC classification number: G11B5/851 ,  C23C14/0036 ,  C23C14/0063 ,  C23C14/025 ,  C23C14/08 ,  C23C14/085 ,  C23C14/14 ,  C23C14/205 ,  C23C14/352 ,  C23C14/54 ,  C23C14/562 ,  G11B5/656

Abstract: A film forming device includes a drum having a circumferential surface, a cathode accommodation unit disposed to be opposite to the circumferential surface, a first gas introducing unit which introduces a first gas into the cathode accommodation unit, and a second gas introducing unit which introduces a second gas between the circumferential surface and the cathode accommodation unit.

公开(公告)号：US20200342905A1

公开(公告)日：2020-10-29

申请号：US16703435

申请日：2019-12-04

Applicant: SONY CORPORATION

Inventor： Minoru YAMAGA ,  Noboru SEKIGUCHI ,  Tooru SATO ,  Takashi AIZAWA

IPC: G11B5/73 ,  G11B5/78

Abstract: A magnetic recording medium is provided and includes a magnetic layer, a non-magnetic layer, a base layer and a back layer, wherein an average thickness tT of the magnetic recording medium is tT≤5.3 μm, a dimensional change amount Δw in a width direction with respect to a change in tension in a longitudinal direction is 700 ppm/N≤Δw, a thickness of the non-magnetic layer is 2.0 μm or less, a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more, and the magnetic layer includes a magnetic powder.

公开(公告)号：US20200342904A1

公开(公告)日：2020-10-29

申请号：US16510024

申请日：2019-07-12

Applicant: SONY CORPORATION

Inventor： Minoru YAMAGA ,  Noboru SEKIGUCHI ,  Tooru SATO ,  Takashi AIZAWA

IPC: G11B5/73 ,  G11B5/78

Abstract: There is provided a magnetic recording medium of which an average thickness tT is tT≤5.6 μ, a dimensional change amount Δw in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/N≤Δw, a squareness ratio in a vertical direction is 65% or more, and a width deformation coefficient b during long-term storage in a case where a long-term storage width change amount Y is defined as Y=blog(t) is −0.06 μm≤b≤0.06 μ.

公开(公告)号：US20190080712A1

公开(公告)日：2019-03-14

申请号：US15765600

申请日：2016-11-16

Applicant: SONY CORPORATION

Inventor： Junichi TACHIBANA ,  Tetsuo ENDO ,  Tomoe OZAKI ,  Takashi AIZAWA

IPC: G11B5/667 ,  G11B5/725 ,  G11B5/73 ,  G11B5/65 ,  C23C14/00

Abstract: A magnetic recording medium includes: an elongated substrate having flexibility; a first layer, being provided on the substrate, containing Cr, Ni, and Fe, and having a face-centered cubic lattice structure with a (111) plane preferentially oriented so as to be parallel to a surface of the substrate; a second layer, being provided on the first layer, containing Co and O, having a ratio of an average atomic concentration of O to an average atomic concentration of Co of 1 or more, and having a column structure with an average particle diameter of 3 nm or more and 13 nm or less; a third layer, being provided on the second layer, and containing Ru; and a perpendicular recording layer, being provided on the third layer.