JPS62202330A - Production of magnetic recording medium - Google Patents

Production of magnetic recording medium

Info

Publication number
JPS62202330A
JPS62202330A JP3666687A JP3666687A JPS62202330A JP S62202330 A JPS62202330 A JP S62202330A JP 3666687 A JP3666687 A JP 3666687A JP 3666687 A JP3666687 A JP 3666687A JP S62202330 A JPS62202330 A JP S62202330A
Authority
JP
Japan
Prior art keywords
cobalt
magnetic layer
substrate
coercive force
vapor deposition
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
Application number
JP3666687A
Other languages
Japanese (ja)
Inventor
Minoru Osada
実 長田
Soichi Matsuzaki
松崎 壮一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lincstech Circuit Co Ltd
Original Assignee
Hitachi Condenser Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Condenser Co Ltd filed Critical Hitachi Condenser Co Ltd
Priority to JP3666687A priority Critical patent/JPS62202330A/en
Publication of JPS62202330A publication Critical patent/JPS62202330A/en
Pending legal-status Critical Current

Links

Landscapes

  • Physical Vapour Deposition (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Thin Magnetic Films (AREA)
  • Paints Or Removers (AREA)

Abstract

PURPOSE:To improve the reproduction characteristic of a high-frequency signal by forming the 1st magnetic layer consisting of a ferromagnetic material of ferrite or chromium on a substrate and sticking a cobalt or cobalt-nickel alloy by a diagonal vapor deposition method at >=70 deg. incident angle to the substrate on the 1st magnetic layer. CONSTITUTION:The coating compd. prepd. by dispersing the ferrite or chromium consisting of a ferromagnetic metal having small coercive force into a thermoplastic binder is coated on the substrate 1 such as polyester film which is a base or said material is deposited on the substrate by the vacuum deposition method to form the 1st magnetic layer 2. A ferromagnetic material such as cobalt, cobalt-nickel alloy or cobalt-doped iron oxide is deposited on the 1st magnetic layer 2 by the diagonal vapor deposition method to form the 2nd magnetic layer. The incident angle of the prescribed angle from the normal to the substrate 1 in the stage of said diagonal vapor deposition is preferably >=70 deg. at which the coercive force increases sharply. The ferromagnetic layer having the large coercive force is thereby easily obtd. and the linearity in the high-frequency region of an audio signal, etc. and the reproduction characteristic of the signal are improved.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は2Waの磁性層を形成した磁気記録媒体の!!
i造方決方法する。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording medium having a 2Wa magnetic layer formed thereon. !
I decide how to make it.

従来の技術 オーディオ用テープ等の磁気記録媒体は、プラスチック
フィルムに強磁性金属を塗布した′bのが製作されてい
るが、オーディオ信号のように低周波から高周波に至る
広帯域の電気的信号は周波数によって磁性層が再生時に
寄与する部分が異なる。
Conventional technologyMagnetic recording media such as audio tapes are manufactured by coating a plastic film with ferromagnetic metal, but wide-band electrical signals ranging from low frequencies to high frequencies, such as audio signals, are The portion that the magnetic layer contributes to during reproduction differs depending on the type.

特に高周波信号は磁性層の表面しか再生に寄与せず、最
近ではこれを改良するため磁性層を2層にした磁気記録
媒体が製造されるようになってきた。
In particular, high frequency signals only contribute to reproduction from the surface of the magnetic layer, and recently, to improve this, magnetic recording media with two magnetic layers have been manufactured.

この2層のものは、第1層に抗磁力の小さい強磁性体を
塗布し、第2層に抗磁力が大なる強磁性体を塗布したも
ので高周波特性が改善されるようになった。
In this two-layer structure, the first layer is coated with a ferromagnetic material having a small coercive force, and the second layer is coated with a ferromagnetic material having a large coercive force, resulting in improved high frequency characteristics.

発明が解決しようとする問題点 従来の2層型の磁気記録媒体は、第2@にコバルトドー
プ酸化鉄を熱可塑性バインダ中に分散させたものを塗布
して形成しているので、高抗磁力の磁性層が得られ難く
、高周波信号の再生も所定以上の特性が得られない欠点
があった。
Problems to be Solved by the Invention Conventional two-layer magnetic recording media have a high coercive force because the second layer is coated with cobalt-doped iron oxide dispersed in a thermoplastic binder. It is difficult to obtain a magnetic layer, and there are disadvantages in that it is difficult to obtain a high-frequency signal reproduction characteristic.

問題点を解決するための手段 本発明は、第1磁性層の上に基体に対する入射角が70
度以上の角度でコバルト又はコバルトニッケル合金を斜
め蒸着法により付着させ形成する磁気記録媒体の製造方
法を提供する。
Means for Solving the Problems The present invention provides a first magnetic layer with an angle of incidence of 70° relative to the substrate.
Provided is a method for manufacturing a magnetic recording medium in which cobalt or a cobalt-nickel alloy is deposited at an angle of at least 100 degrees using an oblique evaporation method.

実施例 本発明の実施例を図面に基づき説明すると、1はポリエ
ステルフィルム等のベースとなる基体であり、この基体
1上に熱可塑性バインダー中に抗磁力の小さい強磁性金
属からなるフェライトやクロムを分散したものを塗布又
は真空蒸着法により第1磁性層2を形成する。この第1
磁性層の上に高抗磁力をうるために、コバルト、コバル
トニッケル合金又はコバルトドープの酸化鉄等の強磁性
体を斜め蒸着法により第2磁性層3を形成する。
EXAMPLE An example of the present invention will be explained based on the drawings. Reference numeral 1 is a base such as a polyester film, and on this base 1, ferrite or chromium made of a ferromagnetic metal with a small coercive force is coated in a thermoplastic binder. The first magnetic layer 2 is formed by coating or vacuum evaporation the dispersed material. This first
In order to obtain a high coercive force on the magnetic layer, the second magnetic layer 3 is formed using a ferromagnetic material such as cobalt, cobalt-nickel alloy, or cobalt-doped iron oxide by oblique vapor deposition.

この斜め蒸着は、基体1に対する法線から所定角度の入
射角をもって強磁性体金属を斜めに付着させる技術であ
る。ポリエステルフィルムにコバルトを蒸着した場合A
とガラスにコバルトを蒸着した場合Bにその入射角を変
えたときの抗磁力の変化を第2図に表わしている。この
グラフから明らかなように、入射角は抗磁力が急激に」
曽大する70度以上がよい。
This oblique vapor deposition is a technique in which ferromagnetic metal is obliquely deposited at a predetermined incident angle from the normal to the substrate 1 . When cobalt is vapor-deposited on polyester film A
Figure 2 shows the change in the coercive force when the incident angle is changed in the case B when cobalt is vapor-deposited on glass. As is clear from this graph, the coercive force increases rapidly at the incident angle.
A temperature of 70 degrees or higher is best.

第2磁・回層3は入射角を70度以上に設定して、真空
蒸着することにより容易に抗磁力の大なる強磁性層がえ
らるので、オーディオ信号等の高周波領域のリニアリテ
ィや信号の再生特性が改善される。
The second magnetic layer 3 can be vacuum-deposited with an incident angle of 70 degrees or more, making it easy to obtain a ferromagnetic layer with a large coercive force. Reproduction characteristics are improved.

発明の効果 以上に述べた通り、本発明の方法で製造したものは、高
周波信号の再生特性で優れた性能を1を揮する磁気記録
媒体かえられる。
Effects of the Invention As described above, the magnetic recording medium manufactured by the method of the present invention can be used as a magnetic recording medium that exhibits excellent performance in reproducing high frequency signals.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の断面図、第2図は入射角と抗磁力との
関係を示す曲線図。 1:基体、2:第111性層、3:第2Fji性層。
FIG. 1 is a sectional view of the present invention, and FIG. 2 is a curve diagram showing the relationship between the incident angle and coercive force. 1: Substrate, 2: 111th layer, 3: 2nd Fji layer.

Claims (1)

【特許請求の範囲】[Claims] (1)基体の表面にフェライト又はクロムの強磁性体か
らなる第1磁性層を形成し、この第1磁性層の上に基体
に対する入射角が70度以上の角度で斜め蒸着法により
コバルト又はコバルトニッケル合金を付着し第2磁性層
を形成することを特徴とする磁気記録媒体の製造方法。
(1) A first magnetic layer made of a ferrite or chromium ferromagnetic material is formed on the surface of the substrate, and cobalt or cobalt is deposited on the first magnetic layer by oblique vapor deposition at an angle of incidence of 70 degrees or more with respect to the substrate. A method of manufacturing a magnetic recording medium, comprising depositing a nickel alloy to form a second magnetic layer.
JP3666687A 1987-02-19 1987-02-19 Production of magnetic recording medium Pending JPS62202330A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3666687A JPS62202330A (en) 1987-02-19 1987-02-19 Production of magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3666687A JPS62202330A (en) 1987-02-19 1987-02-19 Production of magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS62202330A true JPS62202330A (en) 1987-09-07

Family

ID=12476183

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3666687A Pending JPS62202330A (en) 1987-02-19 1987-02-19 Production of magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS62202330A (en)

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