JPS6224852B2 - - Google Patents
Info
- Publication number
- JPS6224852B2 JPS6224852B2 JP57172992A JP17299282A JPS6224852B2 JP S6224852 B2 JPS6224852 B2 JP S6224852B2 JP 57172992 A JP57172992 A JP 57172992A JP 17299282 A JP17299282 A JP 17299282A JP S6224852 B2 JPS6224852 B2 JP S6224852B2
- Authority
- JP
- Japan
- Prior art keywords
- parts
- magnetic
- coercive force
- powder
- recording medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005291 magnetic effect Effects 0.000 claims description 28
- 239000006247 magnetic powder Substances 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 229910001566 austenite Inorganic materials 0.000 claims description 15
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 230000005415 magnetization Effects 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 3
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 3
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 229910020630 Co Ni Inorganic materials 0.000 description 2
- 229910002440 Co–Ni Inorganic materials 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 241001446467 Mama Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
Description
(1) 発明の対象
本発明はオーデイオカセツト用磁気記録媒体に
係るものであり、特に再生イコライザー70μ
sec、ハイポジシヨンと呼ばれるクロムバイアス
で使用する磁気記録媒体に関するものである。
(2) 従来技術
最近のオーデイオカセツト用磁気記録媒体では
高密度化と広いダイナミツクレンジのものが要求
されるようになつた。この要求に答え、Fe系の
合金磁性粉末を使用したメタルテープが実用化さ
れているが、飽和磁化Ms、保磁力Hc共に大きい
ため記録時に磁気ヘツドが飽和する可能性があ
る。このためクロムバイアス値で使用可能なCo
被着γ―Fe2O3磁性粉を使用した記録媒体が普及
しているが、これらCo被着γ―Fe2O3では上記し
たメタルテープに比較して、これと等価のＭ，
Ｏ，Ｌ及び高域特性が得られていないのが現状で
ある。又高密度化のため、保磁力の高い磁性粉末
を使用すると、低周波域に於ける消去率が悪くな
る欠点がある。
(3) 発明の目的
本発明は保磁力Hcが600〜800Oeで飽和磁化δ
ｍが100〜150emu／grの金属磁性粉末に、保磁力
Hcが500〜700Oeで飽和磁化δｍが60〜80emu／
grの酸化鉄磁性粉末を混合した混合磁性粉末を塗
布した磁気記録媒体により、ハイポジシヨンと呼
ばれるクロムバイアスでメタルテープに匹敵する
音感と高M.O.L高S.O.L値を有し、消去率の改善
された磁気記録媒体を得ることを目的とする。
(4) 発明の構成
そして上記目的は本発明によれば非磁性担体上
に、強磁性粉末およびバインターを含む磁性塗料
を塗布して成る磁気記録媒体において、該強磁性
粉末として、保磁力が600〜800Oeで飽和磁化が
100〜150emu／grのFe、Fe―Co―Ni、Fe4Nのい
ずれか１つの金属磁性粉末に、酸化鉄磁性粉末と
して保持力が500〜700Oeで飽和磁化が60〜
80emu／grのγ―Fe2O3を５〜60％（Wt）の割合
で混合したものを使用することを特徴とする磁気
記録媒体によつて達成される。
以下、本発明の一実施例を詳記する。
実施例 １
Fe（Hc＝780Oe 90部（重 量）
γ―Fe2O3（Hc＝670Oe） 10部（ 〃 ）
塩化ビニル酢酸ビニル共重合体 10部（ 〃 ）
ウレタンプレポリマー 10部（ 〃 ）
塩化ビニル安定剤 ２部（ 〃 ）
分散剤 ２部（ 〃 ）
メチルエチルケトン 150部（ 〃 ）
トルエン 80部（ 〃 ）
研摩剤 20部（ 〃 ）
以上の組成分をボールミル中で72時間混練した
後架橋剤3.5部を加えてポリエステルフイルムに
4.5μｍとなるように塗布し磁性粒子を配向させ
乾燥後表面処理し40℃で48時間加熱し架橋させ
た。
実施例 ２
Fe（Hc＝780Oe） 70部（重 量）
γ―Fe2O3（Hc＝670Oe） 30部（ 〃 ）
塩化ビニル酢酸ビニル共重合体 10部（ 〃 ）
ウレタンプレポリマー 10部（ 〃 ）
塩化ビニル安定剤 ２部（ 〃 ）
分散剤 ２部（ 〃 ）
メチルエチルケトン 150部（ 〃 ）
トルエン 80部（ 〃 ）
研摩剤 20部（ 〃 ）
の組成分を実施例１と同様の条件で調整した。
実施例 ３
Fe（Hc＝780Oe） 50部（重 量）
γ―Fe2O3（Hc＝670Oe） 50部（ 〃 ）
塩化ビニル酢酸ビニル共重合体 10部（ 〃 ）
ウレタンプレポリマー 10部（ 〃 ）
塩化ビニル安定剤 ２部（ 〃 ）
分散剤 ２部（ 〃 ）
メチルエチルケトン 150部（ 〃 ）
トルエン 80部（ 〃 ）
研摩剤 20部（ 〃 ）
の組成分を実施例１と同じ条件で調整した。
実施例 ４
Fe（Hc＝750Oe） 70部（重 量）
γ―Fe2O3（Hc＝630Oe） 30部（ 〃 ）
他の混合物は実施例１と同一物を同一重量で混
入して同一条件で調整した。
実施例 ５
Fe（Hc＝750Oe） 50部（重 量）
γ―Fe2O3（Hc＝630Oe） 50部（ 〃 ）
他の混合物は実施例１と同一物を同一重量に混
入し同一条件で調整した。
実施例 ６
Fe（Hc＝710Oe） 70部（重 量）
γ―Fe2O3（Hc＝600De） 30部（ 〃 ）
他の混合物は実施例１と同一物を同一重量で混
入し同一条件で調整した。
実施例 ７
Fe（Hc＝710Oe） 50部（重 量）
γ―Fe2O3（Hc＝600Oe） 50部（ 〃 ）
他の混合物は実施例１と同一物を同一重量で混
入し同一条件で調整した。
実施例 ８
Fe―Co―Ni（Hc＝750Oe） 60部（重 量）
γ―Fe2O3（Hc＝670Oe） 40部（ 〃 ）
他の混合物は実施例１と同一物を同一重量で混
入し同一条件で調整した。
実施例 ９
γ′―Fe4N（Hc＝670Oe） 60部（重 量）
γ―Fe2O3（Hc＝600Oe） 40部（ 〃 ）
他の混合物は実施例１と同一物を同一重量で混
入し同一条件で調整した。
２種類以上の磁性粉末を混合して塗布した磁気
記録媒体では転写し易いという欠点があつた。こ
のため近年特にクロムバイアス用磁気記録媒体で
は多層塗布のテープが出現し上記の欠点を補足し
て来た。磁性粉末の混合による転写の悪化は、保
磁力Hcに大差のある２種以上の磁性粉末を混合
することに起因するもので、歪も当然悪くなる。
そこで本発明は保磁力Hcが710，750，780，Oeで
飽和磁化δｍが124，130，138，emu／grの金属
磁性粉末と保磁力Hcが600，630，670，Oeで飽和
磁化δｍが64，68，74，emu／grの磁性酸化鉄粉
を種々の割合に混合し、バインダーと混練後ポリ
エステルフイルム上に塗布した。上記本発明の各
実施例１乃至９と多層塗布テープとして上層にγ
―Fe2O3（Hc＝670Oe）を下層にγ―Fe2O3（Hc
＝520Oe）を塗布した比較例との総合磁気特性と
して保磁力Hc，残留磁束密度Br，角形比，スイ
ツチング・フイルド・デイストーシヨン
（SFD）を第１表に示す。
第１表より明らかなように金属磁性粉の充填度
は磁性酸化鉄粉の充填度に比較して大きく、又保
磁力の充填度依存性も大きいため、両者の保磁力
は最終的に一致し、各混合磁性粉による記録媒体
の磁気履歴曲線は角型比0.86、SFD0.32近辺の値
を示し、又メタルテープに近い2800Gauss近辺の
残留磁束密度を示した。
第１図は上記比較例と実施例３の周波数特性を
示すもので縦軸に出力レベルを横軸に周波数をと
つたものでA1は比較例をB1は本発明の特性を示
す。この場合の入力は−20dBであり広い周波数
範囲に渡つて出力レベルを向上させることが出来
る。
又比較例A2と本発明の実施例３のMOL（最高
出力レベル）と比較例A3と本発明の実施例３の
SOL（飽和出力レベル）をも同時に示してい
る。
(1) Object of the Invention The present invention relates to a magnetic recording medium for an audio cassette, and in particular to a reproduction equalizer of 70 μm.
sec, relates to magnetic recording media used with chrome bias called high position. (2) Prior Art Recent magnetic recording media for audio cassettes are required to have higher density and wider dynamic range. In response to this demand, metal tapes using Fe-based alloy magnetic powder have been put into practical use, but since both the saturation magnetization Ms and the coercive force Hc are large, there is a possibility that the magnetic head will be saturated during recording. Therefore, the available Co
Recording media using γ-Fe 2 O 3 magnetic powder coated with Co are popular, but these γ-Fe 2 O 3 coated with Co have an equivalent M,
At present, O, L and high frequency characteristics are not obtained. Furthermore, if a magnetic powder with a high coercive force is used to increase the density, there is a drawback that the erasing rate in the low frequency range becomes poor. (3) Purpose of the invention The present invention has a coercive force Hc of 600 to 800 Oe and a saturation magnetization δ.
Coercive force for metal magnetic powder with m of 100 to 150 emu/gr
Hc is 500 to 700 Oe and saturation magnetization δm is 60 to 80 emu/
Magnetic recording media coated with mixed magnetic powder mixed with GR iron oxide magnetic powder have a chromium bias called high position, a pitch comparable to metal tape, high MOL, high SOL value, and improved magnetic erasure rate. The purpose is to obtain a recording medium. (4) Structure of the Invention According to the present invention, the above object is to provide a magnetic recording medium comprising a non-magnetic carrier coated with a magnetic paint containing ferromagnetic powder and binder, in which the ferromagnetic powder has a coercive force of 600 Saturation magnetization at ~800 Oe
100 to 150 emu/gr of Fe, Fe-Co-Ni, or Fe 4 N metal magnetic powder with coercivity of 500 to 700 Oe and saturation magnetization of 60 to 60 as iron oxide magnetic powder.
This is achieved by a magnetic recording medium characterized by using a mixture of 80 emu/gr of γ-Fe 2 O 3 at a ratio of 5 to 60% (Wt). An embodiment of the present invention will be described in detail below. Example 1 Fe (Hc=780 Oe 90 parts (weight) γ-Fe 2 O 3 (Hc=670 Oe ) 10 parts (〃) Vinyl chloride vinyl acetate copolymer 10 parts (〃) Urethane prepolymer 10 parts ( 〃) Vinyl chloride stabilizer 2 parts (〃) Dispersant 2 parts (〃) Methyl ethyl ketone 150 parts (〃) Toluene 80 parts (〃) Abrasive 20 parts (〃) After kneading the above ingredients in a ball mill for 72 hours Add 3.5 parts of crosslinking agent to polyester film
It was coated to a thickness of 4.5 μm, the magnetic particles were oriented, and after drying, the surface was treated and heated at 40° C. for 48 hours to cause crosslinking. Example 2 Fe (Hc=780 Oe ) 70 parts (weight) γ-Fe 2 O 3 (Hc=670 Oe ) 30 parts (〃) Vinyl chloride vinyl acetate copolymer 10 parts (〃) Urethane prepolymer 10 parts (〃) Vinyl chloride stabilizer 2 parts (〃) Dispersant 2 parts (〃) Methyl ethyl ketone 150 parts (〃) Toluene 80 parts (〃) Abrasive 20 parts (〃) The following compositions were prepared under the same conditions as in Example 1. It was adjusted. Example 3 Fe (Hc=780 Oe ) 50 parts (weight) γ-Fe 2 O 3 (Hc=670 Oe ) 50 parts (〃) Vinyl chloride vinyl acetate copolymer 10 parts (〃) Urethane prepolymer 10 parts (〃) Vinyl chloride stabilizer 2 parts (〃) Dispersant 2 parts (〃) Methyl ethyl ketone 150 parts (〃) Toluene 80 parts (〃) Abrasive 20 parts (〃) The compositions were adjusted under the same conditions as in Example 1. did. Example 4 Fe (Hc=750 Oe ) 70 parts (weight) γ-Fe 2 O 3 (Hc=630 Oe ) 30 parts (〃) Other mixtures were the same as in Example 1 and mixed in the same weight. Adjustments were made under the same conditions. Example 5 Fe (Hc=750 Oe ) 50 parts (weight) γ-Fe 2 O 3 (Hc=630 Oe ) 50 parts (〃) Other mixtures were the same as in Example 1 by mixing the same substances in the same weight. Adjusted according to conditions. Example 6 Fe (Hc=710 Oe ) 70 parts (weight) γ-Fe 2 O 3 (Hc=600 De ) 30 parts (〃) Other mixtures were the same as in Example 1, with the same weight mixed in. Adjusted according to conditions. Example 7 Fe (Hc=710 Oe ) 50 parts (weight) γ-Fe 2 O 3 (Hc=600 Oe ) 50 parts (〃) Other mixtures were the same as in Example 1, with the same weight mixed in. Adjusted according to conditions. Example 8 Fe-Co-Ni (Hc=750 Oe ) 60 parts (weight) γ-Fe 2 O 3 (Hc=670 Oe ) 40 parts (〃) Other mixtures were the same as in Example 1 and the same weight. was mixed under the same conditions. Example 9 γ′-Fe 4 N (Hc=670 Oe ) 60 parts (weight) γ-Fe 2 O 3 (Hc=600 Oe ) 40 parts (〃) Other mixtures were the same as in Example 1. They were mixed by weight and adjusted under the same conditions. A magnetic recording medium coated with a mixture of two or more types of magnetic powder has the disadvantage of being easy to transfer. For this reason, in recent years, especially in magnetic recording media for chromium bias, multilayer coated tapes have appeared to compensate for the above-mentioned drawbacks. The deterioration in transfer due to mixing of magnetic powders is caused by mixing two or more types of magnetic powders with large differences in coercive force Hc, and naturally distortion also deteriorates.
Therefore, the present invention uses metal magnetic powders with coercive force Hc of 710, 750, 780, Oe and saturation magnetization δm of 124, 130, 138, emu/gr, and coercive force Hc of 600, 630, 670, Oe with saturation magnetization δm of 124, 130, 138, emu/gr. Magnetic iron oxide powders of 64, 68, 74, and emu/gr were mixed in various proportions, kneaded with a binder, and then coated on a polyester film. In each of Examples 1 to 9 of the present invention and as a multilayer coated tape, γ is added to the upper layer.
-Fe 2 O 3 (Hc=670 Oe ) in the lower layer and γ-Fe 2 O 3 (Hc
Table 1 shows the coercive force Hc, residual magnetic flux density Br, squareness ratio, and switching field distortion (SFD) as compared to the comparative example coated with 520 Oe ). As is clear from Table 1, the degree of filling of the metal magnetic powder is larger than that of the magnetic iron oxide powder, and the coercive force is also highly dependent on the degree of filling, so the coercive forces of the two will ultimately match. The magnetic hysteresis curve of the recording medium using each mixed magnetic powder showed a squareness ratio of 0.86, an SFD of around 0.32, and a residual magnetic flux density of around 2800 Gauss, which is close to that of a metal tape. FIG. 1 shows the frequency characteristics of the comparative example and Example 3, with the output level plotted on the vertical axis and the frequency plotted on the horizontal axis, with A 1 showing the comparative example and B 1 showing the characteristics of the present invention. In this case, the input is -20 dB, and the output level can be improved over a wide frequency range. Also, the MOL (maximum output level) of Comparative Example A 2 and Example 3 of the present invention and the MOL (maximum output level) of Comparative Example A 3 and Example 3 of the present invention
It also shows SOL (saturated output level).
【表】
MOLは通常５％歪が出るまで入力を加えたと
きの出力レベルを示しSOLは入力を高くして行
き出力が飽和するまでのレベルを示すもので本発
明ではMOL及びSOLの出力レベルも高い値が得
られている。又、曲線１は比較例と本発明の磁気
記録媒体とのノイズ分布曲線で実施例８で示す
γ′―Fe4N（Hc＝640Oe）とγ―Fe2O3（Hc＝
600Oe）との磁性粉の混合による場合は比表面積
が20m2／gr以下となると第２図に示す曲線１より
2dB程度ノイズ分布が上昇する。又比表面積が35
m2／gr以上になると保磁力は850Oe以上となつて
クロームポジシヨンでは使用不能となる。そのた
めにγ′―Fe4Nを用いる場合には比表面積を20〜
35m2／grに選択することが好ましい。
更に保磁力Hcが800Oe近い金属磁性粉末を使用
する場合は消去率が悪くなる欠点を生じるので消
去率のすぐれた磁性酸化粉末を混合することによ
つて第１図の電磁変換特性を保持したまま、第２
図に示す望ましい結果を得た。
第２図に於て縦軸は消去率（dB）を示すも
の、横軸は消去電流(A)を示すもので、テープスピ
ード4.75cm／sec、録音ヘツド空隙３μ、再生ヘ
ツド空隙１μ、消去ヘツド空隙10μ、基準レベル
250Pwb／mm、イコライゼーシヨン3180＋70μ
ｓ、信号1KHz、ポジシヨンがCrO2の第１乃至第
３の上記実施例の磁気記録媒体２，３，４と比較
例の磁気記録媒体５との消去率と消去電流との関
係を示すものである。
(5) 発明の効果
以上のように本発明による磁気記録媒体は飽和
磁化δｍの大きい金属磁性粉末を使用するため、
高いMOLをもち、高保磁力と、シヤープなSFD
により高いSOLを示している。それにもかかわ
らず保磁力に於いて近接した磁性酸化鉄との混合
により望ましい消去率を有している。これ等の特
性により従来の多層塗布の磁気記録媒体に比較し
てクロムバイアスで高域感度の延びたメタルテー
プに近い電磁変換特性を得ることが出来た。[Table] MOL usually indicates the output level when input is applied until 5% distortion occurs, and SOL indicates the level at which the input is increased until the output is saturated.In this invention, the output level of MOL and SOL is high values have also been obtained. Curve 1 is the noise distribution curve of the magnetic recording medium of the comparative example and the present invention, and is the noise distribution curve of γ′-Fe 4 N (Hc=640 Oe ) and γ-Fe 2 O 3 (Hc=640 Oe) shown in Example 8.
600 Oe ), when the specific surface area is less than 20 m 2 /gr, the curve 1 shown in Figure 2 shows that
The noise distribution increases by about 2dB. Also, the specific surface area is 35
When m 2 /gr or more, the coercive force becomes 850 Oe or more, making it unusable in a chrome position. For this purpose, when using γ′-Fe 4 N, the specific surface area should be increased from 20 to
It is preferable to choose 35m 2 /gr. Furthermore, if a metal magnetic powder with a coercive force Hc close to 800 Oe is used, the erasure rate will be poor, so by mixing magnetic oxide powder with an excellent erasure rate, the electromagnetic conversion characteristics shown in Figure 1 were maintained. Mama, second
The desired results shown in the figure were obtained. In Figure 2, the vertical axis shows the erasure rate (dB), and the horizontal axis shows the erasure current (A).The tape speed is 4.75 cm/sec, the recording head gap is 3μ, the playback head gap is 1μ, and the erase head is Air gap 10μ, standard level
250Pwb/mm, equalization 3180+70μ
s, a signal of 1 KHz, and a position of CrO 2 The graph shows the relationship between the erasing rate and the erasing current of the magnetic recording media 2, 3, and 4 of the first to third examples above and the magnetic recording medium 5 of the comparative example. be. (5) Effects of the invention As described above, since the magnetic recording medium according to the invention uses metal magnetic powder with a large saturation magnetization δm,
High MOL, high coercive force, and sharp SFD
It shows a higher SOL. Nevertheless, it has a desirable erasing rate by mixing with magnetic iron oxide which is close in coercive force. Due to these characteristics, it was possible to obtain electromagnetic conversion characteristics similar to those of a metal tape with extended high-frequency sensitivity using chromium bias compared to conventional multilayer coating magnetic recording media.
第１図は本発明による磁気記録媒体の電磁変換
特性を示す図で下段はノイズ分布、中段は−
20dB入力のときの出力レベル、上段は５％MOL
とSOLである第２図は本発明実施例１〜４の消
去率と比較例を示したものである。
FIG. 1 is a diagram showing the electromagnetic conversion characteristics of the magnetic recording medium according to the present invention. The lower row shows the noise distribution, and the middle row shows the -
Output level at 20dB input, upper level is 5% MOL
FIG. 2 shows the erasing rates of Examples 1 to 4 of the present invention and a comparative example.
Claims (1)
ーを含む磁性塗料を塗布して成る磁気記録媒体に
おいて、該磁性粉末として、保磁力が600〜800Oe
で飽和磁化が100〜150emu／grのFe，Fe―Co―
Ni，Fe4Nのいずれか１つの金属磁性粉末に、酸
化鉄磁性粉末として保持力が500〜700Oeで飽和磁
化が60〜80emu／grのγ―Fe2o3を５〜60％
（Wt）の割合で混合したものを使用することを特
徴とする磁気記録媒体。1. In a magnetic recording medium formed by coating a magnetic paint containing ferromagnetic powder and a binder on a non-magnetic carrier, the magnetic powder has a coercive force of 600 to 800 Oe .
Fe, Fe―Co― with a saturation magnetization of 100 to 150 emu/gr
Add 5 to 60% of γ-Fe 2 o 3 as an iron oxide magnetic powder with a coercive force of 500 to 700 Oe and a saturation magnetization of 60 to 80 emu/gr to either Ni or Fe 4 N metal magnetic powder.
A magnetic recording medium characterized by using a mixture of (Wt).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57172992A JPS5963028A (en) | 1982-09-30 | 1982-09-30 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57172992A JPS5963028A (en) | 1982-09-30 | 1982-09-30 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5963028A JPS5963028A (en) | 1984-04-10 |
| JPS6224852B2 true JPS6224852B2 (en) | 1987-05-30 |
Family
ID=15952168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57172992A Granted JPS5963028A (en) | 1982-09-30 | 1982-09-30 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5963028A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0228266U (en) * | 1988-08-12 | 1990-02-23 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5911532A (en) * | 1982-07-13 | 1984-01-21 | Tdk Corp | Magnetic recording medium |
| JPS5911533A (en) * | 1982-07-13 | 1984-01-21 | Tdk Corp | Magnetic recording medium |
-
1982
- 1982-09-30 JP JP57172992A patent/JPS5963028A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0228266U (en) * | 1988-08-12 | 1990-02-23 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5963028A (en) | 1984-04-10 |
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