JP2021106070A5 - - Google Patents
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- JP2021106070A5 JP2021106070A5 JP2021070256A JP2021070256A JP2021106070A5 JP 2021106070 A5 JP2021106070 A5 JP 2021106070A5 JP 2021070256 A JP2021070256 A JP 2021070256A JP 2021070256 A JP2021070256 A JP 2021070256A JP 2021106070 A5 JP2021106070 A5 JP 2021106070A5
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- magnetic recording
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- 239000006247 magnetic powder Substances 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 claims description 5
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910000704 hexaferrum Inorganic materials 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 229920001225 polyester resin Polymers 0.000 claims description 2
- 239000004645 polyester resin Substances 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims description 2
- 229920005749 polyurethane resin Polymers 0.000 claims 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
Description
本技術は、磁性層、非磁性層、ベース層およびバック層をこの順に含む層構造を有する磁気記録媒体であって、
前記磁気記録媒体の平均厚みｔＴが、ｔ
Ｔ
≦５．３μｍであり、
前記磁性層には前記磁気記録媒体の長手方向に延びる複数のサーボバンドが設けられており、
前記サーボバンドには、複数のハの字状のサーボパターンが記録されており、
前記磁性層は磁性粉と第一の結着剤を含み、
前記ベース層はポリエステル系樹脂を含み、
前記非磁性層は非磁性粉と第二の結着剤を含み、
前記磁気記録媒体を１／２インチ幅かつ２５０ｍｍの長さに切り出したサンプルに対して、温度２５℃相対湿度５０％の環境下において、前記サンプルの長手方向に０．２Ｎ、０．６Ｎ、及び１．０Ｎの荷重をこの順にかけ、０．２Ｎ及び１．０Ｎの荷重がかけられた場合において測定された前記サンプルの幅を用いて、以下の式より求めた、前記磁気
記録媒体の長手方向のテンション変化に対する前記磁気記録媒体の幅方向の寸法変化量Δｗが、６７０［ｐｐｍ／Ｎ］≦Δｗであり、
前記サーボパターンが再生されたサーボ信号から得られるＰＥＳ（Ｐｏｓｉｔｉｏｎ Ｅｒｒｏｒ Ｓｉｇｎａｌ）値の標準偏差σＰＥＳが、σＰＥＳ≦２５ｎｍであり、
前記磁性層側の表面とＬＴＯ３ヘッドとの間の摩擦係数μ１の測定を２５０回行った場合の前記摩擦係数μ１の最大値μ１Ｍが、０．０４≦μ１Ｍ≦０．５である、
磁気記録媒体を提供する。
前記磁気記録媒体は、垂直方向における角形比が６５％以上でありうる。
前記寸法変化量Δｗは、７０７［ｐｐｍ／Ｎ］≦Δｗ≦２０００［ｐｐｍ／Ｎ］でありうる。
前記寸法変化量Δｗは、７５０［ｐｐｍ／Ｎ］≦Δｗ≦２０００［ｐｐｍ／Ｎ］でありうる。
前記寸法変化量Δｗは、７０７［ｐｐｍ／Ｎ］≦Δｗ≦８００［ｐｐｍ／Ｎ］でありうる。
前記バック層の表面粗度Ｒａｂは、３．０ｎｍ≦Ｒａｂ≦７．５ｎｍでありうる。
前記磁性層側の表面と前記バック層側の表面との間の摩擦係数μが、０．２０≦μ≦０．８０でありうる。
前記磁気記録媒体の温度膨張係数αは、５．５［ｐｐｍ／℃］≦α≦９［ｐｐｍ／℃］であり、且つ、前記磁気記録媒体の湿度膨張係数βが、β≦５．５［ｐｐｍ／％ＲＨ］でありうる。
前記磁気記録媒体のポアソン比ρは、０．２５≦ρでありうる。
前記磁気記録媒体の長手方向の弾性限界値σＭＤが、０．７［Ｎ］≦σＭＤでありうる。
前記弾性限界値σＭＤは、弾性限界測定を行う際の速度Ｖに依らないものでありうる。
前記磁性層が垂直配向しているものであってよい。
前記バック層の平均厚みｔｂが、ｔｂ≦０．６μｍでありうる。
前記磁性層の平均厚みｔｍが、３５ｎｍ≦ｔｍ≦１２０ｎｍでありうる。
前記磁性粉は、ε酸化鉄磁性粉、バリウムフェライト磁性粉、コバルトフェライト磁性粉、又はストロンチウムフェライト磁性粉を含みうる。
前記標準偏差σＰＥＳは、１７ｎｍ≦σＰＥＳ≦２３ｎｍでありうる。
垂直方向における角形比は、７３％以上でありうる。
前記磁性粉は、バリウムフェライト磁性粉を含み、
前記磁性層の平均厚みｔｍが、３５ｎｍ≦ｔｍ≦１００ｎｍであり、
前記磁気記録媒体の垂直方向における保磁力Ｈｃが、１６０ｋＡ／ｍ以上２８０ｋＡ／ｍ以下でありうる。
前記第一の結着剤は、ポリウレタン系樹脂または塩化ビニル系樹脂を含みうる。
前記第二の結着剤は、ポリウレタン系樹脂または塩化ビニル系樹脂を含みうる。
前記磁気記録媒体の幅は、１１ｍｍ以上１９ｍｍ以下でありうる。
本技術は、
前記磁気記録媒体と、
カートリッジケースと、
リールを含み、
前記磁気記録媒体が、前記リールに巻き取られた状態で前記カートリッジケース内に収容されている磁気記録カートリッジも提供する。
The present technology is a magnetic recording medium having a layer structure including a magnetic layer, a non-magnetic layer, a base layer, and a back layer in this order.
The average thickness t T of the magnetic recording medium is t T ≦ 5.3 μm .
The magnetic layer is provided with a plurality of servo bands extending in the longitudinal direction of the magnetic recording medium.
A plurality of V-shaped servo patterns are recorded in the servo band.
The magnetic layer contains a magnetic powder and a first binder and contains.
The base layer contains a polyester resin and contains
The non-magnetic layer contains a non-magnetic powder and a second binder and contains.
0.2N, 0.6N, and 0.2N, 0.6N, and A load of 1.0 N was applied in this order, and the width of the sample measured when a load of 0.2 N and 1.0 N was applied was used to obtain the longitudinal direction of the magnetic recording medium obtained from the following formula. The amount of dimensional change Δw in the width direction of the magnetic recording medium with respect to the tension change is 670 [ppm / N] ≦ Δw.
The standard deviation σPES of the PES (Position Error Signal) value obtained from the servo signal in which the servo pattern is reproduced is σPES ≦ 25 nm.
The maximum value μ 1M of the friction coefficient μ 1 when the friction coefficient μ 1 between the surface on the magnetic layer side and the LTO3 head is measured 250 times is 0.04 ≦ μ 1M ≦ 0.5. ,
Provide a magnetic recording medium.
The magnetic recording medium may have a square ratio of 65% or more in the vertical direction.
The dimensional change amount Δw can be 707 [ppm / N] ≦ Δw ≦ 2000 [ppm / N].
The dimensional change amount Δw can be 750 [ppm / N] ≦ Δw ≦ 2000 [ppm / N].
The dimensional change amount Δw can be 707 [ppm / N] ≦ Δw ≦ 800 [ppm / N].
The surface roughness R ab of the back layer may be 3.0 nm ≦ R ab ≦ 7.5 nm.
The coefficient of friction μ between the surface on the magnetic layer side and the surface on the back layer side can be 0.20 ≦ μ ≦ 0.80.
The coefficient of thermal expansion α of the magnetic recording medium is 5.5 [ppm / ° C] ≦ α ≦ 9 [ppm / ° C], and the coefficient of thermal expansion β of the magnetic recording medium is β ≦ 5.5 [. ppm /% RH].
The Poisson's ratio ρ of the magnetic recording medium can be 0.25 ≦ ρ.
The elastic limit value σ MD in the longitudinal direction of the magnetic recording medium may be 0.7 [N] ≦ σ MD .
The elastic limit value σ MD may not depend on the velocity V when performing the elastic limit measurement.
The magnetic layer may be vertically oriented.
The average thickness t b of the back layer may be t b ≦ 0.6 μm.
The average thickness tm of the magnetic layer may be 35 nm ≦ tm ≦ 120 nm.
The magnetic powder may contain ε-iron oxide magnetic powder, barium ferrite magnetic powder, cobalt ferrite magnetic powder, or strontium ferrite magnetic powder.
The standard deviation σPES can be 17 nm ≤ σ PES ≤ 23 nm.
The square ratio in the vertical direction can be 73% or more.
The magnetic powder contains barium ferrite magnetic powder and contains.
The average thickness tm of the magnetic layer is 35 nm ≤ tm ≤ 100 nm.
The coercive force Hc in the vertical direction of the magnetic recording medium may be 160 kA / m or more and 280 kA / m or less.
The first binder may include a polyurethane-based resin or a vinyl chloride-based resin.
The second binder may include a polyurethane-based resin or a vinyl chloride-based resin.
The width of the magnetic recording medium may be 11 mm or more and 19 mm or less.
This technology
With the magnetic recording medium
Cartridge case and
Including reel
Also provided is a magnetic recording cartridge in which the magnetic recording medium is housed in the cartridge case in a state of being wound on the reel.
Claims (22)
前記磁気記録媒体の平均厚みｔＴが、ｔ Ｔ ≦５．３μｍであり、
前記磁性層には前記磁気記録媒体の長手方向に延びる複数のサーボバンドが設けられており、
前記サーボバンドには、複数のハの字状のサーボパターンが記録されており、
前記磁性層は磁性粉と第一の結着剤を含み、
前記ベース層はポリエステル系樹脂を含み、
前記非磁性層は非磁性粉と第二の結着剤を含み、
前記磁気記録媒体を１／２インチ幅かつ２５０ｍｍの長さに切り出したサンプルに対して、温度２５℃相対湿度５０％の環境下において、前記サンプルの長手方向に０．２Ｎ、０．６Ｎ、及び１．０Ｎの荷重をこの順にかけ、０．２Ｎ及び１．０Ｎの荷重がかけられた場合において測定された前記サンプルの幅を用いて、以下の式より求めた、前記磁気記録媒体の長手方向のテンション変化に対する前記磁気記録媒体の幅方向の寸法変化量Δｗが、６７０［ｐｐｍ／Ｎ］≦Δｗであり、
前記サーボパターンが再生されたサーボ信号から得られるＰＥＳ（Ｐｏｓｉｔｉｏｎ Ｅｒｒｏｒ Ｓｉｇｎａｌ）値の標準偏差σＰＥＳが、σＰＥＳ≦２５ｎｍであり、
前記磁性層側の表面とＬＴＯ３ヘッドとの間の摩擦係数μ１の測定を２５０回行った場合の前記摩擦係数μ１の最大値μ１Ｍが、０．０４≦μ１Ｍ≦０．５である、
磁気記録媒体。 A magnetic recording medium having a layer structure including a magnetic layer, a non-magnetic layer, a base layer, and a back layer in this order.
The average thickness t T of the magnetic recording medium is t T ≦ 5.3 μm .
The magnetic layer is provided with a plurality of servo bands extending in the longitudinal direction of the magnetic recording medium.
A plurality of V-shaped servo patterns are recorded in the servo band.
The magnetic layer contains a magnetic powder and a first binder and contains.
The base layer contains a polyester resin and contains
The non-magnetic layer contains a non-magnetic powder and a second binder and contains.
0.2N, 0.6N, and 0.2N, 0.6N, and A load of 1.0 N was applied in this order, and the width of the sample measured when a load of 0.2 N and 1.0 N was applied was used to obtain the longitudinal direction of the magnetic recording medium obtained from the following formula. The amount of dimensional change Δw in the width direction of the magnetic recording medium with respect to the tension change is 670 [ppm / N] ≦ Δw.
The standard deviation σPES of the PES (Position Error Signal) value obtained from the servo signal in which the servo pattern is reproduced is σPES ≦ 25 nm.
The maximum value μ 1M of the friction coefficient μ 1 when the friction coefficient μ 1 between the surface on the magnetic layer side and the LTO3 head is measured 250 times is 0.04 ≦ μ 1M ≦ 0.5. ,
Magnetic recording medium.
湿度膨張係数βが、β≦５．５［ｐｐｍ／％ＲＨ］である、
請求項１から７のいずれか一項に記載の磁気記録媒体。 The coefficient of thermal expansion α is 5.5 [ppm / ° C] ≤ α ≤ 9 [ppm / ° C], and
The humidity expansion coefficient β is β ≦ 5.5 [ppm /% RH].
The magnetic recording medium according to any one of claims 1 to 7.
前記磁性層の平均厚みｔｍが、３５ｎｍ≦ｔｍ≦１００ｎｍであり、
前記磁気記録媒体の垂直方向における保磁力Ｈｃが、１６０ｋＡ／ｍ以上２８０ｋＡ／ｍ以下である、請求項１から１７のいずれか一項に記載の磁気記録媒体。 The magnetic powder contains barium ferrite magnetic powder, and the magnetic powder contains barium ferrite magnetic powder.
The average thickness tm of the magnetic layer is 35 nm ≤ tm ≤ 100 nm.
The magnetic recording medium according to any one of claims 1 to 17, wherein the coercive force Hc in the vertical direction of the magnetic recording medium is 160 kA / m or more and 280 kA / m or less.
カートリッジケースと、
リールを含み、
前記磁気記録媒体が、前記リールに巻き取られた状態で前記カートリッジケース内に収容されている磁気記録カートリッジ。
The magnetic recording medium according to any one of claims 1 to 21 and the magnetic recording medium.
Cartridge case and
Including reel
A magnetic recording cartridge in which the magnetic recording medium is housed in the cartridge case in a state of being wound on the reel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021070256A JP7226467B2 (en) | 2020-06-17 | 2021-04-19 | magnetic recording medium |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020104582A JP6885495B2 (en) | 2020-06-17 | 2020-06-17 | Magnetic recording medium |
| JP2021070256A JP7226467B2 (en) | 2020-06-17 | 2021-04-19 | magnetic recording medium |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2020104582A Division JP6885495B2 (en) | 2020-06-17 | 2020-06-17 | Magnetic recording medium |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2021106070A JP2021106070A (en) | 2021-07-26 |
| JP2021106070A5 true JP2021106070A5 (en) | 2022-03-10 |
| JP7226467B2 JP7226467B2 (en) | 2023-02-21 |
Family
ID=73045215
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2020104582A Active JP6885495B2 (en) | 2020-06-17 | 2020-06-17 | Magnetic recording medium |
| JP2021070256A Active JP7226467B2 (en) | 2020-06-17 | 2021-04-19 | magnetic recording medium |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2020104582A Active JP6885495B2 (en) | 2020-06-17 | 2020-06-17 | Magnetic recording medium |
Country Status (1)
| Country | Link |
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| JP (2) | JP6885495B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2022211020A1 (en) * | 2021-03-31 | 2022-10-06 | ||
| WO2024070719A1 (en) * | 2022-09-29 | 2024-04-04 | ソニーグループ株式会社 | Magnetic recording medium and cartridge |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03185623A (en) * | 1989-12-13 | 1991-08-13 | Matsushita Electric Ind Co Ltd | Vapor deposition magnetic recording medium |
| JPH04255910A (en) * | 1991-02-08 | 1992-09-10 | Matsushita Electric Ind Co Ltd | Magnetic recording tape |
| JP2005199724A (en) * | 2000-12-05 | 2005-07-28 | Teijin Ltd | Biaxial oriented polyester film laminate and magnetic recording medium |
| JP3706947B2 (en) * | 2001-03-12 | 2005-10-19 | 日立マクセル株式会社 | Magnetic tape cartridge |
| JP2005276258A (en) * | 2004-03-23 | 2005-10-06 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JP2005346865A (en) * | 2004-06-04 | 2005-12-15 | Toray Ind Inc | Magnetic recording medium |
| JP2007250078A (en) * | 2006-03-15 | 2007-09-27 | Fujifilm Corp | Magnetic recording medium |
| JP2007294079A (en) * | 2006-03-29 | 2007-11-08 | Fujifilm Corp | Magnetic tape |
| JP2007287215A (en) * | 2006-04-14 | 2007-11-01 | Toray Ind Inc | Support for magnetic recording medium and magnetic recording medium |
| JP2009087471A (en) * | 2007-09-28 | 2009-04-23 | Fujifilm Corp | Magnetic recording medium |
| JP2008159259A (en) * | 2008-02-13 | 2008-07-10 | Hitachi Maxell Ltd | Magnetic recording medium |
| US10204651B2 (en) * | 2014-06-24 | 2019-02-12 | Sony Corporation | Magnetic recording medium having cubic ferrite or e-phase iron oxide magnetic particles |
| JP6465823B2 (en) * | 2016-02-03 | 2019-02-06 | 富士フイルム株式会社 | Magnetic tape and manufacturing method thereof |
-
2020
- 2020-06-17 JP JP2020104582A patent/JP6885495B2/en active Active
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2021
- 2021-04-19 JP JP2021070256A patent/JP7226467B2/en active Active
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