JPS6173235A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS6173235A JPS6173235A JP19513184A JP19513184A JPS6173235A JP S6173235 A JPS6173235 A JP S6173235A JP 19513184 A JP19513184 A JP 19513184A JP 19513184 A JP19513184 A JP 19513184A JP S6173235 A JPS6173235 A JP S6173235A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- layer
- lubricant
- primer coating
- 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.)
- Pending
Links
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明はベースの少なくとも一方の面に磁性層を設け
てなる磁気ディスクその他の磁気記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic disk or other magnetic recording medium having a base with a magnetic layer on at least one surface.
［従来の技術］
この種の磁気記録媒体においては、磁性層が磁気ヘッド
なとと高速で摺接することから、磁性層中に高級脂肪酸
や高級脂肪酸エステルの如き潤滑剤を含ませこれによっ
て上記摺接による摩耗を防いでいる（文献不詳）。しか
るに、近年高密度記録化の要請に伴って磁性層の薄型化
が検討されており、この場合磁性層中に含ませつる潤滑
剤の絶対量が少なくなってそのぶん磁性層の耐摩耗性改
善効果が充分に得られないという問題があった。[Prior Art] In this type of magnetic recording medium, since the magnetic layer comes into sliding contact with the magnetic head at high speed, a lubricant such as a higher fatty acid or a higher fatty acid ester is contained in the magnetic layer, thereby improving the sliding contact between the magnetic layer and the magnetic head. This prevents wear caused by contact (unspecified literature). However, in recent years, with the demand for high-density recording, thinning of the magnetic layer has been considered, and in this case, the absolute amount of lubricant contained in the magnetic layer is reduced, which improves the wear resistance of the magnetic layer. There was a problem that sufficient effects could not be obtained.
すなわち、磁性層中に潤滑剤を多く入れずきると、バイ
ンダの可塑化によって磁性層の凝集力が低下して耐摩耗
性が却って低下してしまうおそれがあり、また磁性層表
面に潤滑剤が多１にブリードアウトするため磁気ヘッド
と磁性層との間のスペーシングが増加して出力が低下し
たり、磁気ヘッドと磁性層とがはりつくという現象を生
じる。In other words, if too much lubricant is not added to the magnetic layer, the cohesive force of the magnetic layer may decrease due to plasticization of the binder, which may actually reduce the wear resistance. As a result, the spacing between the magnetic head and the magnetic layer increases, resulting in a decrease in output or a phenomenon in which the magnetic head and the magnetic layer stick together.
このように、磁性層中に含ませうる潤滑剤の量には自ず
と限度があるため、磁性層の厚みが薄くなるほどその絶
対量は少なくならざるをえず、たとえば厚みが２β以下
通常１μ程度の磁性層にあっては一般に磁性層の単位表
面積（ＩＲ）あたり２００ Ｉｎ９以上も含ませること
は困難であった。As described above, there is a natural limit to the amount of lubricant that can be included in the magnetic layer, so the thinner the magnetic layer is, the smaller the absolute amount must be. In general, it has been difficult to contain 200 In9 or more per unit surface area (IR) of the magnetic layer.
［発明が解決しようとする問題点］
この発明は、上記観点から、磁性層の厚みを高密度記録
化に対応させうる２−以下の肉薄とする際の潤滑剤の含
有量低下の問題点を解決して、高密度記録化と同時に磁
性層の耐摩耗性の改善を図りうる磁気記録媒体を得るこ
とを目的とする。[Problems to be Solved by the Invention] From the above viewpoint, the present invention solves the problem of decreasing the lubricant content when reducing the thickness of the magnetic layer to 2 or less, which is compatible with high-density recording. The object of the present invention is to solve the problem and obtain a magnetic recording medium that can achieve high-density recording and simultaneously improve the wear resistance of the magnetic layer.
［問題点を解決するための手段１
この発明者らは、上記問題点の解決のために鋭意検討し
た結果、ベースと磁性層との間に非磁性の下塗り層を形
成し、この下塗り層と磁性層との両方あるいは下塗り層
のみに潤滑剤を含ませ、下塗り層に含ませた潤滑剤を磁
性層の空隙を通して磁性層表面に滲出移行させるように
すれば、磁性層の、ワみを高密度記録化に対応させつる
肉薄としたときでも磁性層の単位表面積（ｌｒｒｆ）あ
たりの潤滑剤の含有量を従来に比し多くできこれにより
潤滑効果を長期にわたり持続させることができるととも
に、この場合潤滑剤過多に起因した前述の如き問題が一
切生じないことを知り、この発明を完成するに至った。[Means for Solving the Problems 1] As a result of intensive studies to solve the above problems, the inventors formed a non-magnetic undercoat layer between the base and the magnetic layer, and If a lubricant is contained in both the magnetic layer or only the undercoat layer, and the lubricant contained in the undercoat layer oozes and migrates to the surface of the magnetic layer through the gaps in the magnetic layer, the warpage of the magnetic layer can be increased. Even when the magnetic layer is made thinner to accommodate density recording, the lubricant content per unit surface area (lrrf) of the magnetic layer can be increased compared to conventional methods, and the lubricant effect can be sustained over a long period of time. This invention was completed based on the knowledge that the above-mentioned problems caused by too much lubricant do not occur at all.
すなわち、この発明は、ベースの少なくとも一方の面に
厚みが２ｐ以下の磁性層を設けるとともにこの磁性層と
ベースとの間に磁性層の厚みの０１倍以上の厚みを有す
る非磁性の下塗り層を形成し、この下塗り層と磁性層と
の両層中に潤滑剤を磁性層の単位表面積（１ｍ’）あた
り２２０■以上と、なる割合で含ませてなる磁気記録媒
体に係るものである。That is, the present invention provides a magnetic layer having a thickness of 2p or less on at least one surface of the base, and a non-magnetic undercoat layer having a thickness of 01 times or more the thickness of the magnetic layer between this magnetic layer and the base. The present invention relates to a magnetic recording medium in which a lubricant is contained in both the undercoat layer and the magnetic layer at a ratio of 220 μm or more per unit surface area (1 m') of the magnetic layer.
［発明の構成・作用］
この発明においてはポリエステルフィルムやその他の好
ましくは可撓性のベースの片面もしくは両面に非磁性の
下塗り層と磁性層とからなる二層構造の塗膜を形成する
。磁性層の厚みは、高密度記録化の要請に対応させうる
ように２声以下、通常０．５μまで、特に好ましくは約
１声程度である。[Structure and operation of the invention] In this invention, a two-layered coating film consisting of a non-magnetic undercoat layer and a magnetic layer is formed on one or both sides of a polyester film or other preferably flexible base. The thickness of the magnetic layer is preferably two tones or less, usually up to 0.5 μm, and particularly preferably about one tone, in order to meet the demands for high-density recording.
一方、下塗り層はこの層中に潤滑剤を多く含ませうるよ
うにできるだけ厚くすることが好ましいが、少なくとも
磁性層厚の０．１倍以上、好ましくは０．３倍以上で通
常５倍程度までとするのがよい。On the other hand, the undercoat layer is preferably made as thick as possible so that a large amount of lubricant can be contained in this layer, but it is at least 0.1 times the thickness of the magnetic layer, preferably 0.3 times or more, and usually up to about 5 times the thickness of the magnetic layer. It is better to
下塗り層と磁性層との合計厚みとしては一般に１．３〜
３０−程度であるのが望ましい。下塗り層があまり厚く
なりすぎると磁気ディスクや磁気テープを得る場合の可
撓性が損なわれるなどの問題があり、好ましくない。The total thickness of the undercoat layer and magnetic layer is generally 1.3~
It is desirable that it be about 30-. If the undercoat layer becomes too thick, there will be problems such as loss of flexibility when obtaining a magnetic disk or magnetic tape, which is not preferable.
非磁性の下塗り層の形成は、たとえばベースの片面もし
くは両面に適宜のバインダを有機溶剤などに溶解させて
なる下塗り用塗料を塗布乾燥して行えばよく、また磁性
層の形成は、上記の下塗り層上にバインダと磁性粉とを
含む従来公知の各種磁性塗料を常法に準じて塗布乾燥し
て行えばよい。The non-magnetic undercoat layer can be formed by, for example, applying and drying an undercoat paint made by dissolving a suitable binder in an organic solvent on one or both sides of the base, and the magnetic layer can be formed by applying the undercoat paint made by dissolving an appropriate binder in an organic solvent or the like to one or both sides of the base. Various conventionally known magnetic paints containing a binder and magnetic powder may be coated on the layer and dried according to a conventional method.
下塗り層と磁性層とに用いるバインダは同一であっても
異なるものであってもよく、磁性層に通常用いられてい
る塩化ビニル−酢酸ビニル系共重合体、ポリウレタン樹
脂、ポリエステル樹脂、繊維素系樹脂、ポリビニルブチ
ラール樹脂、ポリアセタール樹脂、低分子量ポリイソシ
アネートなどの各種バインダが広く使用可能である。磁
性層中に含ませる磁性粉についても特に制限はなく、Ｔ
−Ｆｅ２０３扮、 Ｆｅ５０．粉、コバルト含有酸化鉄
磁性粉、鉄粉、コバルト粉、鉄−コバルト合金粉の如き
酸化物系磁性粉や金属ないし合金磁性粉などの従来公知
の磁性粉がいずれも使用可能である。The binders used for the undercoat layer and the magnetic layer may be the same or different, and include vinyl chloride-vinyl acetate copolymers, polyurethane resins, polyester resins, and cellulose-based binders commonly used for magnetic layers. A wide variety of binders can be used, such as resins, polyvinyl butyral resins, polyacetal resins, and low molecular weight polyisocyanates. There are no particular restrictions on the magnetic powder contained in the magnetic layer, and T
-Fe203, Fe50. Any conventionally known magnetic powder such as powder, cobalt-containing iron oxide magnetic powder, iron powder, cobalt powder, oxide magnetic powder such as iron-cobalt alloy powder, or metal or alloy magnetic powder can be used.
このような下塗り層と磁性層との両層中に潤滑剤を含ま
せる方法としては、下塗り用塗料および磁性塗料中に上
記潤滑剤を予め混入させ、これら塗料を用いて前述の方
法にて下塗り層および磁性層を形成する方法が好ましい
。この方法においてはできるだけ下塗り用塗料中に潤滑
剤を多く含ませて磁性塗料中への潤滑剤の添加量は少な
くするかあるいは潤滑剤無添加とするのが好ましい。無
添加とする場合でも下塗り層中の潤滑剤は経時的に磁性
層の空隙部内に徐々に滲出移行する。A method of including a lubricant in both the undercoat layer and the magnetic layer is to mix the above lubricant into the undercoat paint and magnetic paint in advance, and apply the undercoat using these paints in the above-described method. Methods of forming the layers and magnetic layers are preferred. In this method, it is preferable to include as much lubricant as possible in the undercoating paint and to reduce the amount of lubricant added to the magnetic paint, or to add no lubricant. Even when no additive is used, the lubricant in the undercoat layer gradually oozes into the voids of the magnetic layer over time.
また上記塗料中に潤滑剤を混入させる方法のほか、下塗
り層および磁性層を形成したのちに、磁性層の表面側か
ら潤滑剤溶液をトップコートして磁性層および下塗り層
中に含浸させる方法を採用してもよい。In addition to the above-mentioned method of mixing a lubricant into the paint, there is a method of forming an undercoat layer and a magnetic layer, and then top-coating a lubricant solution from the surface side of the magnetic layer and impregnating it into the magnetic layer and undercoat layer. May be adopted.
下塗り層と磁性層との両層に含ませる潤滑剤の量は、磁
性層の単位表面積（ｌｉ）あたり２２０ ｍ９以上、好
ましくは２５０ ｍ’ｊ以上通常７００ ｍｑまでとす
ることかできる。この際下塗り層の厚みを潤滑剤の上記
含有量に応じて厚くすることにより、潤滑剤過多に起因
した前述の如き問題、たとえば磁性層の凝集力低下の問
題や出力低下の問題などは一切回避される。The amount of lubricant contained in both the undercoat layer and the magnetic layer can be 220 m9 or more, preferably 250 m'j or more, and usually up to 700 mq per unit surface area (li) of the magnetic layer. At this time, by increasing the thickness of the undercoat layer according to the above-mentioned lubricant content, the aforementioned problems caused by too much lubricant, such as the problem of a decrease in cohesive force of the magnetic layer and the problem of a decrease in output, are completely avoided. be done.
用いる潤滑剤としては、高級脂肪酸、高級脂肪酸エステ
ル、炭化水素、シリコンオイル、フッ素オイル、ポリエ
ーテルなど従来公知の常温で液状ないし半固形状のもの
がいずれも使用できる。As the lubricant to be used, any conventionally known lubricant that is liquid or semi-solid at room temperature can be used, such as higher fatty acids, higher fatty acid esters, hydrocarbons, silicone oils, fluorine oils, and polyethers.
なお、前記潤滑剤の含有量は、飽（までもベースの片面
に設けられる下塗り層および磁性層についてであり、し
たがって両面に下塗り層および磁性層を設ける場合は各
面での潤滑剤の量が前記範囲内となるようにすればよい
。また、この発明の磁気記録媒体は、ベースとその少な
くとも一方の面に設けられた非磁性の下塗り層および磁
性層とを必須の構成要素として含むものであるか、必要
に応じてベースと下塗り層との間にさらに接着剤層なと
の適宜の層が介在されたものであってもよいっ
［発明の効果］
以上のように、この発明の磁気記録媒体においては、磁
性層の厚みを２ｐ以下としているから近年の高密度記録
化の要請に容易に対応させることができるとともに、こ
の磁性層とベースとの間に潤滑剤を多く含浸させつる下
塗り層を設けて磁性層の単位表面積（ＩＨ）あたりの潤
滑剤量が多くなるような構成としているから、これによ
って磁性層の凝集力の低下や出力の低下などの問題をき
たすことなく磁性層の耐摩耗性を大幅に改善することが
できる。Note that the above lubricant content is for the undercoat layer and magnetic layer provided on one side of the base, so if the undercoat layer and magnetic layer are provided on both sides, the amount of lubricant on each side is The magnetic recording medium of the present invention may include a base and a non-magnetic undercoat layer and a magnetic layer provided on at least one surface of the base as essential components. If necessary, an appropriate layer such as an adhesive layer may be further interposed between the base and the undercoat layer. [Effects of the Invention] As described above, the magnetic recording medium of the present invention Since the thickness of the magnetic layer is 2p or less, it can easily meet the recent demands for high-density recording, and a lubricant is impregnated between the magnetic layer and the base to create a vine undercoat layer. Since the structure is such that the amount of lubricant per unit surface area (IH) of the magnetic layer is increased, this improves the wear resistance of the magnetic layer without causing problems such as a decrease in the cohesive force of the magnetic layer or a decrease in output. performance can be significantly improved.
〔実施例１
以下に、この発明の実施例を比較例と対比して記述する
。なお、以下において部とあるは重量部を意味するもの
とする。[Example 1] Examples of the present invention will be described below in comparison with comparative examples. In addition, in the following, parts shall mean parts by weight.
実施例１
厚みが７５μのポリエステルフィルムの両面に下記の下
塗り用塗料を塗布し、乾燥厚が表裏それぞれ２．ＯＰと
なる一対の下塗り層を形成した。Example 1 The following undercoating paint was applied to both sides of a polyester film with a thickness of 75 μm, and the dry thickness was 2.5 μm on each side. A pair of undercoat layers serving as OP were formed.
く下塗り用塗料〉
ンクロへキサノン ２１０部
メチルエチルケトン ２１０部つきに、上記
の両下塗り層上に下記の磁性塗料を塗布し、乾燥厚が表
裏それぞれ１０−となる一対の磁性層を形成した。その
後、カレンタ処理を施し、円板状に打ち抜いて磁気ディ
スクを作製した。このディスクにおける磁性層の単位表
面積（１ｍ′）あたりの潤滑剤量は表裏両面でそれぞれ
３００ｍりでめった。Undercoat paint> The following magnetic paint was applied onto both of the above undercoat layers using 210 parts of Ncrohexanone and 210 parts of methyl ethyl ketone to form a pair of magnetic layers having a dry thickness of 10 - on each side. Thereafter, it was subjected to calendering treatment and punched out into a disk shape to produce a magnetic disk. The amount of lubricant per unit surface area (1 m') of the magnetic layer in this disk was measured at a distance of 300 m on both the front and back surfaces.
〈磁性塗料〉
ＣＯ含有Ｔ−Ｆｅ２Ｑ３粉 ２７０部ＶＡ
ＧＨ（前出） ４０部バンデック
スＴ−５２５０（前出） ４０部コロネート
Ｌ（前出） ２０部Ｈ５−５００（旭
カーボン社製の商品名； ３４部カーボンブラック
）
α−Ｆｅ２０３粉 １０部メチル
イソブチルケトン ５００部ト ル
エ ン ５
００部実施例２
磁性塗料中に潤滑剤として脂肪酸エステル（実施例１に
記載のものと同じ）を５部添加するようにした以外は、
実施例１と同様にして磁気ディスクを作製した。このデ
ィスクにおける磁性層の単位表面ｉ （Ｉ ｎ？ ）あ
たりの潤滑剤量は表裏両面でそれぞれ３５０ ｍｑであ
った。<Magnetic paint> CO-containing T-Fe2Q3 powder 270 parts VA
GH (mentioned above) 40 parts Bandex T-5250 (mentioned above) 40 parts Coronate L (mentioned above) 20 parts H5-500 (trade name manufactured by Asahi Carbon Co., Ltd.; 34 parts carbon black) α-Fe203 powder 10 parts Methyl Isobutyl ketone 500 parts Torr
En 5
00 parts Example 2 Except that 5 parts of fatty acid ester (same as described in Example 1) was added as a lubricant to the magnetic paint,
A magnetic disk was produced in the same manner as in Example 1. The amount of lubricant per unit surface i (I n? ) of the magnetic layer in this disk was 350 mq on both the front and back surfaces.
実施例３
下塗り用塗料中の脂肪酸エステルの使用量を１０部から
２０部に変更した以外は、実施例１と同様にして磁気デ
ィスクを作製した。このディスクにおける磁性層の単位
表面積（１ｍ２）あたりの潤滑剤量は表裏両面でそれぞ
れ６００ ｍｑであった。Example 3 A magnetic disk was produced in the same manner as in Example 1, except that the amount of fatty acid ester used in the undercoating paint was changed from 10 parts to 20 parts. The amount of lubricant per unit surface area (1 m2) of the magnetic layer in this disk was 600 mq on both the front and back surfaces.
実施例４
下塗り用塗料中の脂肪酸エステル１０部の代わりに流動
パラフィン１０部を用いた以外は、実施例１と同様にし
て磁気ディスクを作製した。このディスクにおける磁性
層の単位表面積（１ｍ’）あたりの潤滑剤量は表裏両面
共実施例１と同じであった。Example 4 A magnetic disk was produced in the same manner as in Example 1, except that 10 parts of liquid paraffin was used instead of 10 parts of fatty acid ester in the undercoating paint. The amount of lubricant per unit surface area (1 m') of the magnetic layer in this disk was the same as in Example 1 on both the front and back surfaces.
比較例１
下塗り層の形成を省略するとともに、磁性塗料中に潤滑
剤として脂肪酸エステル（実施例１に記載のものと同じ
）を５部添加するようにした以外は、実施例１と同様に
して磁気ディスクを作製した。このディスクにおける磁
性層の単位表面積（１扉）あたりの潤滑剤量は表裏両面
でそれぞれ５０ｍｇであった。Comparative Example 1 The same procedure as Example 1 was carried out, except that the formation of the undercoat layer was omitted and 5 parts of fatty acid ester (same as that described in Example 1) was added as a lubricant to the magnetic paint. A magnetic disk was created. The amount of lubricant per unit surface area (one door) of the magnetic layer in this disk was 50 mg on both the front and back surfaces.
比較例２
脂肪酸エステルの添加量を２０部とした以外は、比較例
１と同様にして磁気ディスクを作製し九このディスクに
おける磁性層の単位表面１（１ｒｒｆ）あたりの潤滑剤
量は表裏両面共実施例１と同じであった。Comparative Example 2 A magnetic disk was produced in the same manner as Comparative Example 1 except that the amount of fatty acid ester added was 20 parts.The amount of lubricant per unit surface (1rrf) of the magnetic layer in this disk was Same as Example 1.
以上の実施例および比較例で得られた各磁気ディスクに
つき、日立マクセル社製磁気ディスク耐久性試験機を用
いて以下の如き耐久性試験を行った結果は下記の表に示
されるとおりであった。Each of the magnetic disks obtained in the above examples and comparative examples was subjected to the following durability test using a magnetic disk durability tester manufactured by Hitachi Maxell, and the results were as shown in the table below. .
く耐久性試験〉
ディスク回転数３００ｒｐｍ、相対速度１ｙｎ／秒、書
き込み周波数１２５ ＫＨｚの条件で記録し、再生出力
が初期出力の７０％となるまでの走行時間を耐久性時間
とした。Durability Test> Recording was performed under the conditions of a disc rotation speed of 300 rpm, a relative speed of 1 yn/sec, and a writing frequency of 125 KHz, and the running time until the playback output reached 70% of the initial output was defined as the durability time.
上記の結果からも明らかなように、この発明の磁気ディ
スクは磁性層の厚みが１声と薄くて高密度記録化の要請
に容易に対応させることかできるとともに、磁性層の、
ｔｉ摩耗性が良好で耐久性にすくれたものとなっている
ことが判る。なお、下塗り層を設けないで肉薄の磁性層
に多量の潤滑剤を含ませてなる比較例２の磁気ディスク
は、磁性層の凝集力の低下によってこの発明の磁気ディ
スクの如き高度の耐久性改善効果が得られていないばか
りか、磁性層表面への潤滑剤の過反な滲出によって出力
の低下や磁気ヘッドとはりつくなどの問題が生じてくる
ことか認められた。As is clear from the above results, the magnetic disk of the present invention has a magnetic layer as thin as one layer, and can easily meet the demands for high-density recording.
It can be seen that the Ti abrasion resistance is good and the durability is low. The magnetic disk of Comparative Example 2, in which a large amount of lubricant is contained in a thin magnetic layer without providing an undercoat layer, has a high degree of durability improvement like the magnetic disk of the present invention due to the reduction in the cohesive force of the magnetic layer. Not only was it not effective, but it was also found that excessive leaching of lubricant onto the surface of the magnetic layer caused problems such as a decrease in output and sticking to the magnetic head.
Claims (1)
の磁性層を設けるとともにこの磁性層とベースとの間に
磁性層の厚みの０．１倍以上の厚みを有する非磁性の下
塗り層を形成し、この下塗り層と磁性層との両層中に潤
滑剤を磁性層の単位表面積（１ｍ＾２）あたり２２０ｍ
ｇ以上となる割合で含ませてなる磁気記録媒体。(1) A magnetic layer with a thickness of 2 μm or less is provided on at least one surface of the base, and a non-magnetic undercoat layer with a thickness of 0.1 times or more the thickness of the magnetic layer is formed between this magnetic layer and the base. The lubricant is added to both the undercoat layer and the magnetic layer at a rate of 220 m2 per unit surface area (1 m^2) of the magnetic layer.
A magnetic recording medium in which the magnetic recording medium is contained in a proportion of 1.5 g or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19513184A JPS6173235A (en) | 1984-09-17 | 1984-09-17 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19513184A JPS6173235A (en) | 1984-09-17 | 1984-09-17 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6173235A true JPS6173235A (en) | 1986-04-15 |
Family
ID=16335993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19513184A Pending JPS6173235A (en) | 1984-09-17 | 1984-09-17 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6173235A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62231417A (en) * | 1986-03-31 | 1987-10-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JP2011187090A (en) * | 2010-03-04 | 2011-09-22 | Hitachi Maxell Ltd | Guide member, magnetic tape driving device, and magnetic tape |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57198536A (en) * | 1981-05-28 | 1982-12-06 | Sony Corp | Magnetic recording medium |
| JPS5987623A (en) * | 1982-10-20 | 1984-05-21 | Fujitsu Ltd | Magnetic storage body |
-
1984
- 1984-09-17 JP JP19513184A patent/JPS6173235A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57198536A (en) * | 1981-05-28 | 1982-12-06 | Sony Corp | Magnetic recording medium |
| JPS5987623A (en) * | 1982-10-20 | 1984-05-21 | Fujitsu Ltd | Magnetic storage body |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62231417A (en) * | 1986-03-31 | 1987-10-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JP2011187090A (en) * | 2010-03-04 | 2011-09-22 | Hitachi Maxell Ltd | Guide member, magnetic tape driving device, and magnetic tape |
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