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1. WO2021059922 - MAGNETIC RECORDING MEDIUM

Publication Number WO/2021/059922
Publication Date 01.04.2021
International Application No. PCT/JP2020/033522
International Filing Date 04.09.2020
IPC
G11B 5/70 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
68comprising one or more layers of magnetisable particles homogeneously mixed with a bonding agent
70on a base layer
G11B 5/706 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
68comprising one or more layers of magnetisable particles homogeneously mixed with a bonding agent
70on a base layer
706characterised by the composition of the magnetic material
G11B 5/714 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
68comprising one or more layers of magnetisable particles homogeneously mixed with a bonding agent
70on a base layer
714characterised by the dimension of the magnetic particles
G11B 5/716 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
68comprising one or more layers of magnetisable particles homogeneously mixed with a bonding agent
70on a base layer
716characterised by two or more magnetic layers
G11B 5/842 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
84Processes or apparatus specially adapted for manufacturing record carriers
842Coating a support with a liquid magnetic dispersion
Applicants
  • ソニー株式会社 SONY CORPORATION [JP]/[JP]
Inventors
  • 市瀬 奈津貴 ICHISE, Natsuki
  • 山鹿 実 YAMAGA, Minoru
  • 前嶋 克紀 MAESHIMA, Katsunori
  • 寺川 潤 TERAKAWA, Masaru
  • 高橋 健 TAKAHASHI, Takeshi
  • 佐藤 友恵 SATO, Tomoe
  • 潟口 嵩 KATAGUCHI, Takashi
Agents
  • 杉浦 正知 SUGIURA, Masatomo
  • 杉浦 拓真 SUGIURA, Takuma
Priority Data
2019-17611726.09.2019JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) MAGNETIC RECORDING MEDIUM
(FR) SUPPORT D'ENREGISTREMENT MAGNÉTIQUE
(JA) 磁気記録媒体
Abstract
(EN)
This tape-shaped magnetic recording medium comprises a recording layer including ε-iron oxide particles. The total area Stotal of the SFD curve of the recording layer in the vertical direction, and the area Slow of the SFD curve in a region where coercivity Hc satisfies the expression -500 [Oe] ≤ Hc ≤ 500 [Oe], have an area ratio Rlow (= (Slow / Stotal) × 100) of 5.5% or less.
(FR)
Ce support d'enregistrement magnétique en forme de bande comprend une couche d'enregistrement comprenant des particules d'oxyde de fer ε. La surface totale Stotale de la courbe SFD de la couche d'enregistrement dans la direction verticale , et la surface Sbasse de la courbe SFD dans une région dans laquelle la coercivité Hc satisfait à l'expression -500 [Oe] ≤ Hc ≤ 500 [Oe] , ont un rapport de surface Rbas (= (Sbasse/Stotale ) × 100) de 5,5 % ou moins.
(JA)
磁気記録媒体は、テープ状の磁気記録媒体であって、ε酸化鉄粒子を含む記録層を備える。垂直方向における記録層のSFDカーブの総面積Stotalと、保磁力Hcが-500[Oe]≦Hc≦500[Oe]の範囲におけるSFDカーブの面積Slowとの面積比Rlow(=(Slow/Stotal)×100)が、5.5%以下である。
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