JPH0546012B2

JPH0546012B2 -

Info

Publication number: JPH0546012B2
Application number: JP58038964A
Authority: JP
Inventors: Kenichiro Momose; Shizuo Oozeki; Yukihiro Okayama; Masahiro Namatame
Original assignee: Tokyo Shibaura Electric Co Ltd
Current assignee: Toshiba Corp
Priority date: 1983-03-11
Filing date: 1983-03-11
Publication date: 1993-07-12
Also published as: JPS59165223A

Description

[Detailed description of the invention]

（発明の技術的分野）本発明は、スペーサおよび／またはギヤツプに
特殊な非磁性材を用いてコアと均一に摩耗するよ
うに工夫した磁気ヘツドに関する。（発明の技術的背景とその問題点）磁気ヘツドのコア材としては各種の材料が用い
られるが、量的に最も多いオーデイオ用としては
パーマロイが主流である。このパーマロイは透磁
率が高く、加工しやすい材料であるが、耐摩耗性
の悪いことが大きな欠点であり、各種の耐摩耗パ
ーマロイが提案された今でも、本質的な問題の一
つである。一方ヘツドにおいてはスペーサおよ
び／またはギヤツプに非磁性体を用いる。今まで
パーマロイに対する非磁性体は、鋼系合金、及び
洋白が用いられていた。これらは耐食性が悪いこ
と、耐摩耗性のよいパーマロイを使用した場合
は、追従できないことなどの欠点があつた。一方
SUS304やSUS316などを使用した場合は逆に耐
摩耗性がよすぎて、例えばスペーサに使用した場
合、その部分だけが残り、テープにきずをつけた
り、ヘツドコアとテープの接触を悪くする欠点が
あつた。（発明の目的）本発明は、これらの状況を勘案して、各種パー
マロイと耐摩耗性を合わすことができ、かつ耐食
性のよい非磁性材を、スペーサおよび／またはギ
ヤツプに用いたヘツドを提供することをその目的
とする。（発明の概要）本発明は、ヘツドの磁気ヘツドコアにパーマロ
イを用い、ヘツドのスペーサおよび／またはギヤ
ツプにNi−Cr−Fe系合金のCr量をおさえた合金
を用いることを特色とするもの、及びCu−Ni系
合金にCrを添加した合金を用いることを特色と
するものの２つから成つている。前者の具体的成分は、Cr3％〜15％、Ni10％〜
38％、残部実質的にFeよりなり、さらに好まし
くは、Cr7％〜12％、Ni15％〜35％、残部実質的
にFeよりなる。Crは３％以下では耐食性が悪く、
15％以上では耐摩耗性がパーマロイに比べてよす
ぎる。Niが10％〜38％以外では非磁性になりに
くい。後者の具体的成分はCr3％〜20％、Ni2％〜70
％、残部実質的にCuよりなる。Crは３％以下で
は耐食性、耐摩耗性が悪く20％以上では加工性を
害する。Niは２％以下では加工性が悪く、70％
以上では非磁性になりにくい。なお、この系の合
金には、硬度を上げるなどの目的でZnやTiが添
加されることがあり、その系でもCrの添加は有
効である。（発明の実施例）表に示すような成分の各種材でスペーサを作り
80Ni−3Nb−3Mo−Feのパーマロイをコア材と
してヘツドを作成した。このヘツドにテープを
300時間走行させ、コア部に対するスペーサ部の
摩耗量を調査した。その結果を表１に示す。 (Technical Field of the Invention) The present invention relates to a magnetic head that uses a special non-magnetic material for the spacer and/or the gap so that it will wear uniformly with the core. (Technical background of the invention and its problems) Various materials are used as the core material of a magnetic head, but permalloy is the mainstream for audio use, which is the most abundant in terms of quantity. This permalloy has high magnetic permeability and is an easy-to-process material, but its major drawback is its poor wear resistance, which remains one of the essential problems even now, even though various wear-resistant permalloys have been proposed. On the other hand, in the head, a non-magnetic material is used for the spacer and/or gap. Until now, steel-based alloys and nickel silver have been used as non-magnetic materials for permalloy. These had disadvantages such as poor corrosion resistance and inability to follow when permalloy, which has good wear resistance, was used. on the other hand
On the other hand, when SUS304 or SUS316 are used, their abrasion resistance is too good, so when they are used for spacers, for example, only that part remains, resulting in scratches on the tape and poor contact between the head core and the tape. . (Object of the Invention) Taking these circumstances into consideration, the present invention provides a head in which a spacer and/or gap is made of a non-magnetic material that can match the wear resistance of various types of permalloy and has good corrosion resistance. Its purpose is to (Summary of the Invention) The present invention is characterized in that permalloy is used for the magnetic head core of the head, and a Ni-Cr-Fe alloy with a reduced amount of Cr is used for the spacer and/or gap of the head; It consists of two types, each featuring the use of an alloy in which Cr is added to a Cu-Ni alloy. The specific components of the former are 3% to 15% Cr and 10% to Ni.
38%, the remainder substantially consisting of Fe, more preferably 7% to 12% Cr, 15% to 35% Ni, and the remainder substantially consisting of Fe. If Cr is less than 3%, corrosion resistance is poor.
At 15% or more, the wear resistance is too good compared to permalloy. If Ni is other than 10% to 38%, it is difficult to become non-magnetic. The specific components of the latter are Cr3%~20%, Ni2%~70
%, the remainder consisting essentially of Cu. If Cr is less than 3%, corrosion resistance and wear resistance will be poor, and if it is more than 20%, it will impair workability. If Ni is less than 2%, workability is poor, and if Ni is 70%
Above that, it is difficult to become non-magnetic. Note that Zn and Ti are sometimes added to this type of alloy for the purpose of increasing hardness, and the addition of Cr is also effective in this type of alloy. (Example of the invention) Spacers are made from various materials with the components shown in the table.
The head was made using 80Ni-3Nb-3Mo-Fe permalloy as the core material. tape on this head
The vehicle was run for 300 hours and the amount of wear of the spacer section relative to the core section was investigated. The results are shown in Table 1.

【表】（発明の効果）実施例に示したように本発明のヘツドはスペー
サ材とコア材の摩耗量の差がなく、テープタツチ
のよいヘツドが得られる。又、耐食性もよいので外観をそこなうことがな
い。製造上も何の問題もないので安価で良質のヘツ
ドを供給することができる。[Table] (Effects of the Invention) As shown in the examples, in the head of the present invention, there is no difference in the amount of wear between the spacer material and the core material, and a head with good tape touch can be obtained. Also, since it has good corrosion resistance, the appearance will not be damaged. Since there are no manufacturing problems, we can supply high-quality heads at low cost.

Claims

[Claims] 1. A magnetic head core made of permalloy, and a weight ratio of 3% to 15% Cr, 10% to 38% Ni, and the balance substantially
A magnetic head characterized in that a spacer and/or gap is made of Fe and is non-magnetic. 2 Magnetic head core made of permalloy, with weight ratio of 7% to 12% Cr, 15% to 35% Ni, and the remainder substantially
A magnetic head characterized in that a spacer and/or gap is made of Fe and is non-magnetic. 3 Magnetic head core made of permalloy, with weight ratio of 3% to 20% Cr, 2% to 70% Ni, and the remainder substantially
A magnetic head characterized in that a spacer and/or a gap is made of Cu and is non-magnetic.