JPS62222427A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS62222427A JPS62222427A JP61064701A JP6470186A JPS62222427A JP S62222427 A JPS62222427 A JP S62222427A JP 61064701 A JP61064701 A JP 61064701A JP 6470186 A JP6470186 A JP 6470186A JP S62222427 A JPS62222427 A JP S62222427A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- magnetic recording
- layer
- durability
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 64
- 239000002245 particle Substances 0.000 claims abstract description 10
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 6
- 239000010419 fine particle Substances 0.000 claims description 8
- -1 polyethylene Polymers 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract description 4
- 229920006122 polyamide resin Polymers 0.000 abstract description 3
- 238000011282 treatment Methods 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 2
- 239000000314 lubricant Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 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 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 3
- 239000010410 layer Substances 0.000 abstract 3
- 238000005498 polishing Methods 0.000 abstract 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 239000004698 Polyethylene Substances 0.000 abstract 1
- 239000002216 antistatic agent Substances 0.000 abstract 1
- 239000011247 coating layer Substances 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 229920000573 polyethylene Polymers 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- 239000003973 paint Substances 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical group [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、磁気記録媒体に関する。[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to magnetic recording media.
（従来の技術）
一般に磁気記録媒体は、ポリエチレンテレフタレートの
ような樹脂材料からなる支持体と、この支持体上膜けら
れ、磁性粉、研摩剤等を結合樹脂中に含有させた磁性層
から構成されている。(Prior Art) Magnetic recording media generally consist of a support made of a resin material such as polyethylene terephthalate, and a magnetic layer formed by coating the support and containing magnetic powder, abrasive, etc. in the binding resin. has been done.
磁気記録媒体は、リングヘッドのような磁気ヘッドを介
して繰り返し情報の記録・再生を行なうことができるが
、この場合、磁気ヘッドは回転又は直進している磁気記
録媒体と常に接触するので、磁気ヘッドに結合樹脂等の
異物が付着する。このため、磁性層中に研摩剤を含有さ
せ、磁気ヘッドを少しずつ研摩しヘッドの目づまりを防
いでいた。Magnetic recording media can repeatedly record and reproduce information via a magnetic head such as a ring head, but in this case, the magnetic head is always in contact with the rotating or linearly moving magnetic recording medium, so the magnetic Foreign matter such as binding resin adheres to the head. For this reason, an abrasive is contained in the magnetic layer and the magnetic head is polished little by little to prevent the head from clogging.
（第２図参照）
最近、磁気記録の高密度化により、粒径の小さい磁性粉
を結合樹脂中に高充填させた磁性層を有する磁気記録媒
体が開発されている。さらに、塗布技術の進歩により磁
性層の厚みが１ｐ以下のものが得られるようになってい
る。(See FIG. 2) Recently, due to the increase in the density of magnetic recording, magnetic recording media having a magnetic layer in which a binding resin is highly filled with magnetic powder of small particle size have been developed. Furthermore, advances in coating technology have made it possible to obtain magnetic layers with a thickness of 1 p or less.
ところが、上述のように磁性層中に含有されている研摩
剤のクリーニング効果が充分発揮されるためには、研摩
剤は粒径が大きく、硬い粒子でなければならない。この
ため、従来の磁気記録媒体では、磁性層の薄型化に伴な
い磁性層の平滑さが損なわれ、磁気記録媒体の走行性、
耐久性が劣化してしまう。However, as mentioned above, in order for the abrasive contained in the magnetic layer to fully exhibit its cleaning effect, the abrasive must have a large particle size and be hard particles. For this reason, in conventional magnetic recording media, as the magnetic layer becomes thinner, the smoothness of the magnetic layer is impaired, and the running performance of the magnetic recording medium is reduced.
Durability will deteriorate.
（発明が解決しようとする問題点）
以上のように、磁気記録媒体においては磁性層の薄型化
に伴ない、走行性、耐久性が悪くなるという問題点があ
った。(Problems to be Solved by the Invention) As described above, magnetic recording media have had the problem that running properties and durability deteriorate as the magnetic layer becomes thinner.
本発明はこのような問題点に鑑みなされたものであり、
磁性層が薄く、走行性、耐久性に優れた磁気記録媒体を
提供することを目的とする。The present invention was made in view of these problems,
The purpose of the present invention is to provide a magnetic recording medium with a thin magnetic layer and excellent running properties and durability.
（問題点を解決するための手段）
本発明は、支持体と支持体上に設けられ、平均粒径０．
５〜３虜の研摩剤を含有する下塗層と、下塗層の上に設
けられ、強磁性微粒子を含有し、膜厚１ρ以下の磁性層
とを具備したことを特徴とする磁気記録媒体である。(Means for Solving the Problems) The present invention provides a support, a support provided on the support, and an average particle size of 0.
A magnetic recording medium comprising: an undercoat layer containing an abrasive of 5 to 3 μm; and a magnetic layer provided on the undercoat layer, containing ferromagnetic fine particles, and having a thickness of 1ρ or less. It is.
すなわち、支持体上に研摩剤を含有させた下塗層を設け
た後に、強磁性微粒子を含有させた磁性層を設けること
で薄塗り磁性層を有した高密度磁気記録媒体が得られる
のである。In other words, by providing an undercoat layer containing an abrasive on a support and then providing a magnetic layer containing ferromagnetic fine particles, a high-density magnetic recording medium with a thinly coated magnetic layer can be obtained. .
まず、支持体としては、従来から用いられているもので
あれば何であ・でもよく、格別限定されるものではない
。例えば、ポリエチレン テレフタレートのようなポリ
エステル、ポリプロピレンのようなポリオレフィン類、
セルロースト＋Ｊアセテートのようなセルロース誘導体
、ポリカーボネート、ポリイミド、ポリアミド等をあげ
ることができる。First, the support may be any conventionally used support, and is not particularly limited. For example, polyesters such as polyethylene terephthalate, polyolefins such as polypropylene,
Examples include cellulose derivatives such as cellulose + J acetate, polycarbonate, polyimide, polyamide, and the like.
下塗層は、主に研摩剤とそれを結着する結合樹脂から構
成される。研摩剤としては、Ａｌ２Ｏ，。The undercoat layer mainly consists of an abrasive and a binding resin that binds the abrasive. The abrasive is Al2O.
Ｃｒ、０３ 、ｓｉｃ、’ｒｉ、ｏ、 、ａ−Ｆｅ、Ｏ
５のような高硬度粉末をあげることができる。硬度はモ
ース硬度が８以上のものが好ましい。研摩剤の平均粒径
は０．５１！ｉｎから３岬である。０．５μｍより小さ
い場合には磁気ヘッドのクリーニング効果が十分現われ
ず、３μｍを起える場合には、走行性及び耐久性が悪く
なる。Cr,03,sic,'ri,o,,a-Fe,O
High hardness powders such as No. 5 can be mentioned. The hardness preferably has a Mohs hardness of 8 or more. The average particle size of the abrasive is 0.51! It is 3 capes from In. If it is smaller than 0.5 μm, the cleaning effect of the magnetic head will not be sufficient, and if it is more than 3 μm, running performance and durability will deteriorate.
結合樹脂としては、例えば、塩化ビニル−酢酸ビニル共
重合体、塩化ビニル−塩化ビニリデン共重合体、アクリ
ル酸エステル−アクリルニトリル共重合体、ポリアミド
樹脂、ポリビニルブチラール樹脂、セルロースの誘導体
、ポリエステル樹脂、ポリウレタン樹脂、尿素樹脂、メ
ラミン樹脂、シリコーン系樹脂、アクリル系樹脂、フェ
ノール樹脂、エポキシ樹脂等をあげることができる。下
塗層への研摩剤の添加量および下塗層厚は、下塗層に求
められる支持体への接着性、表面性などの因子によって
適宜選定される。一般にはＱ、ｌ、ｇ＋から２、□ｌ１
ｍであることが好ましい。さらに、下塗層にカーボンブ
ラックのような導電性粉末を添加することにより、磁性
層表面の帯電を防止することもできる。Examples of the binding resin include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, acrylic ester-acrylonitrile copolymer, polyamide resin, polyvinyl butyral resin, cellulose derivative, polyester resin, and polyurethane. Examples include resins, urea resins, melamine resins, silicone resins, acrylic resins, phenol resins, and epoxy resins. The amount of abrasive added to the undercoat layer and the thickness of the undercoat layer are appropriately selected depending on factors such as adhesion to the support and surface properties required for the undercoat layer. Generally Q, l, g+ to 2, □l1
It is preferable that it is m. Furthermore, by adding conductive powder such as carbon black to the undercoat layer, charging on the surface of the magnetic layer can be prevented.
本発明で使用される強磁性微粒子としては、ｒ−Ｆｅ、
０３．Ｃｒｙ、 、Ｃｏ−ｒＦｅ２０． 、金属鉄のよ
うな針状微粉、バリウムフェライトのような六方晶フ墨
うイト系微粒子等をあげることができるが、六方晶ツー
ライト系微粒子のような粒度分布がせまい微粒子が好ま
しい。六方晶フェライト系微粒子としては、バリウムフ
ェライトの各種コバルト置換体、ストロンチウムフェラ
イトの各種コバルト置換体、各種のＷ型バリウムフェラ
イト、各種のＷ型ストロンチウムフェライトなどをあげ
ることができる。磁性層中の結合樹脂としては、下塗層
中の結合樹脂と同様なものをあげることができる。The ferromagnetic fine particles used in the present invention include r-Fe,
03. Cry, ,Co-rFe20. , needle-like fine powders such as metallic iron, and hexagonal turite-based fine particles such as barium ferrite, etc., but fine particles with a narrow particle size distribution such as hexagonal turite-based fine particles are preferred. Examples of the hexagonal ferrite-based fine particles include various cobalt-substituted barium ferrites, various cobalt-substituted strontium ferrites, various W-type barium ferrites, and various W-type strontium ferrites. The binding resin in the magnetic layer may be the same as the binding resin in the undercoat layer.
＃ｆ−−ｒＣ／−１委３ＬｌｒＦｌす、τＥヒ４シｈ協
ｖｘｗロー＃＋Ｌコζ１１１；Ｔ【陶剤、潤滑剤などを
添加することもできる。#f--rC/-1 3LlrFl, τEhi 4shih cooperation vxw Low #+Lkoζ111;T [Porcelain, lubricant, etc. can also be added.
このようにして得られる磁性層を、上述のような下塗層
の上に設けることで本発明の磁気記録媒体が得られる。The magnetic recording medium of the present invention can be obtained by providing the magnetic layer thus obtained on the undercoat layer as described above.
本発明の磁気記録媒体は、次のような方法により作製す
ることができる。まず、研摩材、結合樹脂を溶媒ととも
に混練し、これを支持体に塗布し下塗層を形成する。次
に強磁性微粒子、添加剤。The magnetic recording medium of the present invention can be manufactured by the following method. First, an abrasive material and a binding resin are kneaded together with a solvent, and this is applied to a support to form an undercoat layer. Next are ferromagnetic particles and additives.
結合樹脂を溶媒とともに混練して磁性塗料を製造し、こ
の磁性塗料を下塗層の上に塗布した後、配向処理、乾燥
処理等を施して磁気記録媒体を完成する。A magnetic paint is produced by kneading the binding resin with a solvent, and after this magnetic paint is applied onto the undercoat layer, an orientation treatment, a drying treatment, etc. are performed to complete a magnetic recording medium.
（作 用）
本発明の磁気記録媒体では、下塗層中の研摩剤の一部分
が磁性層に突き出している。（第１図参照）このため、
磁気記録媒体の磁気ヘッドクリーニング作用を失わせる
ことなく、母性層が薄く、走行性、耐久性が良好な磁気
記録媒体を得ることができる。(Function) In the magnetic recording medium of the present invention, a portion of the abrasive in the undercoat layer protrudes into the magnetic layer. (See Figure 1) For this reason,
A magnetic recording medium with a thin mother layer and good running properties and durability can be obtained without losing the magnetic head cleaning effect of the magnetic recording medium.
（実施例）
下記第１表及び第２表に示す組成の下塗塗料、磁性塗料
を調整した。(Example) Primer paints and magnetic paints having the compositions shown in Tables 1 and 2 below were prepared.
第 １ 表
（単位：重量部）
”４’ｌｔ＆＋、ｏＰｍ
ネ′ 市 −リ １．５１．Ｌｒｎ−に＊
ＪＬ；： ｌ、 ２．５１”第 ２ 表
次に７５−厚のポリエチレンテレフタレートフィルム上
にＡ−Ｄの下塗塗料を用いて塗布厚が０゜８μｍの下塗
層を設け、この上にａ−ｃの磁性塗料を用いて塗布厚が
Ｑ、３虜から２．０−の各種の厚さの磁性層を塗布した
。カレンダー処理を行ない、硬化後に３．５インチの円
板状に打ちぬいた。Table 1 (Unit: parts by weight)
JL;: 1, 2.51" Table 2 Next, an undercoat layer with a coating thickness of 0°8 μm was applied using the A-D undercoat paint on the 75-thick polyethylene terephthalate film, and a- Magnetic layers of various thicknesses from 3 to 2.0 mm were coated using a magnetic paint of C.The magnetic paint was calendered and after curing was punched out into 3.5 inch discs. .
以上のようにして、第３表に示すような磁気記録媒体を
作製した。In the manner described above, magnetic recording media as shown in Table 3 were produced.
各種の媒体について、走行性、耐久性の評価を石こなっ
た。Various media were evaluated for runnability and durability.
（試験方法）
走行性、耐久性は通常の３．５インチのドライブにｌ０
ＫＢＰＩで記録し、出力が最初の７５ｔｓになるまでの
回転数を調べた。ヘッドの押しつけ圧は１５ｇである。(Test method) Running performance and durability are 10% compared to a normal 3.5 inch drive.
It was recorded with KBPI and the number of rotations until the output reached the first 75ts was investigated. The pressing pressure of the head was 15 g.
試験の結果、本発明の実施例では走行性、耐久性におい
て十分な値が得られた。As a result of the test, sufficient values were obtained in terms of running performance and durability in the examples of the present invention.
これに対し、比較例では走行性、耐久性が低かった。On the other hand, in the comparative example, running performance and durability were low.
本発明によれば、磁性層が薄く、走行性、耐久用 ３
表
性に優れた磁気記録媒体を得ることができる。According to the present invention, the magnetic layer is thin and has good running properties and durability.
A magnetic recording medium with excellent surface properties can be obtained.
第１図は、この発明の実施例による磁気記録媒体の断面
図である。
第２図は、従来の技術による磁気記録体の断面図である
。
１・・・支持体、２・・・下塗層、３・・・磁性層、４
・・・研摩剤。FIG. 1 is a sectional view of a magnetic recording medium according to an embodiment of the invention. FIG. 2 is a cross-sectional view of a magnetic recording medium according to the prior art. DESCRIPTION OF SYMBOLS 1...Support, 2...Undercoat layer, 3...Magnetic layer, 4
...Abrasive.
Claims (1)
３μｍの研摩剤を含有する下塗層と、下塗層の上に設け
られ、強磁性微粒子を含有し、膜厚１μｍ以下の磁性層
とを具備したことを特徴とする磁気記録媒体。(1) Provided on the support and the support, with an average particle size of 0.5 to
A magnetic recording medium comprising: an undercoat layer containing an abrasive of 3 μm in thickness; and a magnetic layer provided on the undercoat layer, containing ferromagnetic fine particles, and having a thickness of 1 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61064701A JPH07107735B2 (en) | 1986-03-25 | 1986-03-25 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61064701A JPH07107735B2 (en) | 1986-03-25 | 1986-03-25 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62222427A true JPS62222427A (en) | 1987-09-30 |
| JPH07107735B2 JPH07107735B2 (en) | 1995-11-15 |
Family
ID=13265710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61064701A Expired - Lifetime JPH07107735B2 (en) | 1986-03-25 | 1986-03-25 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07107735B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02260234A (en) * | 1989-03-31 | 1990-10-23 | Konica Corp | Magnetic recording medium |
| JPH0512650A (en) * | 1991-01-24 | 1993-01-22 | Matsushita Electric Ind Co Ltd | Magnetic tape |
| JPH05298653A (en) * | 1992-04-14 | 1993-11-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| US5455112A (en) * | 1992-01-31 | 1995-10-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5756148A (en) * | 1991-01-21 | 1998-05-26 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5827600A (en) * | 1991-01-21 | 1998-10-27 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62159338A (en) * | 1986-01-06 | 1987-07-15 | Hitachi Maxell Ltd | Magnetic recording medium |
-
1986
- 1986-03-25 JP JP61064701A patent/JPH07107735B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62159338A (en) * | 1986-01-06 | 1987-07-15 | Hitachi Maxell Ltd | Magnetic recording medium |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02260234A (en) * | 1989-03-31 | 1990-10-23 | Konica Corp | Magnetic recording medium |
| US5827600A (en) * | 1991-01-21 | 1998-10-27 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6020022A (en) * | 1991-01-21 | 2000-02-01 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5985408A (en) * | 1991-01-21 | 1999-11-16 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5756148A (en) * | 1991-01-21 | 1998-05-26 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5763046A (en) * | 1991-01-21 | 1998-06-09 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5851622A (en) * | 1991-01-21 | 1998-12-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5795646A (en) * | 1991-01-21 | 1998-08-18 | Fuji Photo Film Co. Ltd. | Magnetic recording medium |
| US5811166A (en) * | 1991-01-21 | 1998-09-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5811172A (en) * | 1991-01-21 | 1998-09-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| JPH0512650A (en) * | 1991-01-24 | 1993-01-22 | Matsushita Electric Ind Co Ltd | Magnetic tape |
| US5780141A (en) * | 1991-04-25 | 1998-07-14 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5792543A (en) * | 1991-04-25 | 1998-08-11 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5455112A (en) * | 1992-01-31 | 1995-10-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| JPH05298653A (en) * | 1992-04-14 | 1993-11-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07107735B2 (en) | 1995-11-15 |
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