JPH0476174B2 - - Google Patents
Info
- Publication number
- JPH0476174B2 JPH0476174B2 JP8160785A JP8160785A JPH0476174B2 JP H0476174 B2 JPH0476174 B2 JP H0476174B2 JP 8160785 A JP8160785 A JP 8160785A JP 8160785 A JP8160785 A JP 8160785A JP H0476174 B2 JPH0476174 B2 JP H0476174B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- measured
- thin film
- magnetic
- coil
- 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
- 239000010409 thin film Substances 0.000 claims description 18
- 238000007689 inspection Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 description 9
- 230000008929 regeneration Effects 0.000 description 8
- 238000011069 regeneration method Methods 0.000 description 8
- 230000006698 induction Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Landscapes
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電子機器類に広く利用されている磁
気記録装置における記録再生用の磁気ヘツドの再
生効率を評価する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for evaluating the reproducing efficiency of a magnetic head for recording and reproducing in a magnetic recording device widely used in electronic equipment.
従来の技術
磁気記録は磁気記録媒体上に磁気ヘツドを用い
て信号を記録し、再生するが、この磁気ヘツドの
特性、特に再生効率の評価は研究開発及び製造検
査の段階で重要な項目である。Conventional technology Magnetic recording uses a magnetic head to record and reproduce signals on a magnetic recording medium.Evaluation of the characteristics of this magnetic head, especially the reproduction efficiency, is an important item at the research and development and manufacturing inspection stages. .
従来、磁気ヘツドの再生効率の評価を行なうに
は、その一例として第２図に示すように被測定磁
気ヘツド１０１のギヤツプ部１０２の部分に磁気
記録媒体（この場合、テープまたはフロツピデイ
スク）１０４を接触させるべくこの磁気記録媒体
１０４を支持具１０５に取付けた加圧パツド１０
６により押圧している。そして磁気記録媒体１０
４は矢印Ａ方向に走行させ、この磁気記録媒体１
０４に規定信号を記録し、再生時に、被測定磁気
ヘツド１０１のコイル１０３から出力信号を取出
して測定を行なつている。 Conventionally, in order to evaluate the reproduction efficiency of a magnetic head, as an example, as shown in FIG. The pressure pad 10 is attached to a support 105 to hold the magnetic recording medium 104.
It is pressed by 6. and magnetic recording medium 10
4 is run in the direction of arrow A, and this magnetic recording medium 1
A prescribed signal is recorded on the magnetic head 04, and during reproduction, an output signal is taken out from the coil 103 of the magnetic head 101 to be measured and measured.
またヘツド自体の記録や再生効率を知るために
は常に一定の磁気信号がギヤツプ部に与えられな
ければならないので、従来の他の磁気ヘツド評価
法としてこれを利用する方法がある。この評価法
は第３図に示すように被測定磁気ヘツド１１１の
主磁極薄膜１１２に対向して外部励磁コア１１４
を設置し、このコア１１４に巻いたコイル１１５
に信号電流を流し、発生した磁界を被測定磁気へ
ツド１１１のコイル１１３から再生する方式であ
る。 In addition, in order to know the recording and reproducing efficiency of the head itself, a constant magnetic signal must always be applied to the gap, so there is another conventional magnetic head evaluation method that utilizes this. In this evaluation method, as shown in FIG.
A coil 115 is installed and wound around this core 114.
In this method, a signal current is passed through the magnetic field, and the generated magnetic field is reproduced from the coil 113 of the magnetic head 111 to be measured.
発明が解決しようとする問題点
しかしながら前者の評価法によると、磁気記録
媒体１０４とギヤツプ部１０２の接触走行状態が
記録再生特性値を大きく支配し、磁気記録媒体１
０４の表面状態が悪いと特に信号特性に悪い影響
を及ぼし、結果的に測定の機械的変動を防止する
ことができず、被測定磁気ヘツド１０１の録再特
性の評価を悪くしてしまう。そのため被測定磁気
ヘツド１０１自体の録再評価を間違つてしまう問
題を有している。Problems to be Solved by the Invention However, according to the former evaluation method, the contact running state between the magnetic recording medium 104 and the gap portion 102 largely controls the recording and reproducing characteristic values, and the magnetic recording medium
If the surface condition of the magnetic head 101 is poor, it will have a particularly bad influence on the signal characteristics, and as a result, it will be impossible to prevent mechanical fluctuations in measurement, and the evaluation of the recording/reproducing characteristics of the magnetic head 101 to be measured will be deteriorated. Therefore, there is a problem in that the recording/reproducing evaluation of the magnetic head 101 itself to be measured is incorrect.
これに対し後者の評価法によると、被測定磁気
ヘツド１１１及びコア１１４を固定しているの
で、再生信号の機械的変動が無く、前者における
測定の変動については除去することができる。し
かしコア１１４から発生する磁界は広く被測定磁
気ヘツド１１１に影響を与え、ヘツド主磁極薄膜
１１２のみでなく、全体への電磁誘導を引き起こ
してしまい、コイル１１３の再生信号からはヘツ
ドギヤツプのみの真の再生効率が得られない問題
を有している。 On the other hand, according to the latter evaluation method, since the magnetic head 111 to be measured and the core 114 are fixed, there is no mechanical variation in the reproduced signal, and the measurement variation in the former can be eliminated. However, the magnetic field generated from the core 114 widely influences the magnetic head 111 to be measured, causing electromagnetic induction not only in the head main magnetic pole thin film 112 but also in the entire head, and from the reproduced signal of the coil 113, the true value of only the head gap can be seen. There is a problem that regeneration efficiency cannot be obtained.
そこで、本発明は、磁気ヘツドの真の電磁変換
効率、特に再生効率を機械的変動や外部誘導の影
響を受けることなく、正確に測定して評価するこ
とができ、また磁気ヘツドの再生効率を自由に、
且つ容易に測定することができて製造した磁気ヘ
ツドの特性を正確に早く評価することができるよ
うにした磁気ヘツド再生効率の評価法を提供しよ
うとするものである。 Therefore, the present invention makes it possible to accurately measure and evaluate the true electromagnetic conversion efficiency of a magnetic head, especially the regeneration efficiency, without being influenced by mechanical fluctuations or external induction, and to evaluate the regeneration efficiency of a magnetic head. freely,
Another object of the present invention is to provide a method for evaluating magnetic head regeneration efficiency that can be easily measured and allows the characteristics of manufactured magnetic heads to be accurately and quickly evaluated.
問題点を解決するための手段
そして上記問題点を解決するための本発明の技
術的な手段は、透明なセラミツクスよりなる支持
体により薄膜を挾み、この薄膜の回りに少しの間
隔をとつてコイルを巻付けて構成した検査用磁気
ヘツドの前記薄膜を被測定の磁気ヘツドの薄膜に
接触、もしくは近接させ、検査用磁気ヘツドのコ
イルに規準信号電流を印加し、被測定の磁気ヘツ
ドのコイルに発生する出力を測定するものであ
る。Means for Solving the Problems The technical means of the present invention for solving the above problems is to sandwich a thin film between supports made of transparent ceramics, and leave a small space around the thin film. The thin film of the magnetic head for inspection, which is constructed by winding a coil, is brought into contact with or in close proximity to the thin film of the magnetic head to be measured, and a reference signal current is applied to the coil of the magnetic head to be measured. It measures the output generated by the
作 用
本発明は、上記構成により、被測定の磁気ヘツ
ドの効率に最も重要なギヤツプ部である薄膜に接
し、若しくは近接して規準信号電流を与えるの
で、出力変動による不正確さやコイルへの悪影響
がなく、再生効率を正確に測定し、評価すること
ができる。また規準信号電流を変えることにより
被測定の磁気ヘツドの再生効率を自由に、且つ容
易に測定することができる。Effects of the Invention With the above configuration, the present invention provides a reference signal current in contact with or in the vicinity of the thin film, which is the gap part that is most important for the efficiency of the magnetic head being measured, thereby reducing inaccuracies due to output fluctuations and adverse effects on the coil. Therefore, regeneration efficiency can be accurately measured and evaluated. Furthermore, by changing the reference signal current, the regeneration efficiency of the magnetic head under test can be measured freely and easily.
実施例
以下、本発明の一実施例について図面を用いて
詳細に説明する。第１図に示すように被測定の磁
気ヘツド１の評価を行なうために検査用磁気ヘツ
ド２を用いる。この検査用磁気ヘツド２は透明な
セラミツクス製の支持体２１により挾まれた高透
磁率薄膜２２の回りにコイル２３が少し間隔を明
けて巻かれて構成されている。Embodiment Hereinafter, an embodiment of the present invention will be described in detail using the drawings. As shown in FIG. 1, an inspection magnetic head 2 is used to evaluate a magnetic head 1 to be measured. This inspection magnetic head 2 is constructed by winding a coil 23 at a slight interval around a high magnetic permeability thin film 22 sandwiched between transparent ceramic supports 21.
被測定の磁気ヘツド１のギヤツプ部の透磁率薄
膜１１に検査用磁気ヘツド２の高透磁率薄膜２２
を接触、もしくは近接させる。これら両ヘツド
１，２の薄膜１１，２２が一致しているかどうか
は、透明なセラミツクスよりなる支持体２１を通
して顕微鏡３により観測することができ、これに
より正確に位置合わせすることができる。しかる
後、検査用磁気ヘツド２のコイル２３に検査の基
準信号電流を印加し、相互誘導により被測定の磁
気ヘツド１のコイル１２に発生する出力を測定す
る。このとき、上記のように両ヘツド１，２の薄
膜１１，２２は透明なセラミツクスよりなる支持
体２１を通して確認し、正確に一致させることが
できるので、ヘツドギヤツプ位置の不整合による
測定データのばらつきはなくなる。また上記実施
例では検査用磁気ヘツド２から発生する磁界の垂
直方向成分を大きくすることができ、被測定の磁
気ヘツドとして検査用磁気ヘツド２と同様な構造
を持つ垂直磁気記録用ヘツドの再生効率を正確に
測定することもできる。 The high magnetic permeability thin film 22 of the magnetic head 2 for inspection is attached to the magnetic permeability thin film 11 of the gap part of the magnetic head 1 to be measured.
touch or be close to each other. Whether or not the thin films 11 and 22 of both heads 1 and 2 are aligned can be observed using a microscope 3 through a support 21 made of transparent ceramics, thereby allowing accurate positioning. Thereafter, a reference signal current for testing is applied to the coil 23 of the magnetic head 2 for testing, and the output generated in the coil 12 of the magnetic head 1 to be measured due to mutual induction is measured. At this time, as mentioned above, the thin films 11 and 22 of both heads 1 and 2 can be confirmed through the support 21 made of transparent ceramics and matched accurately, so that variations in measurement data due to mismatching of the head gap positions can be avoided. It disappears. Furthermore, in the embodiment described above, the perpendicular component of the magnetic field generated from the magnetic head 2 for inspection can be increased, and the reproduction efficiency of a perpendicular magnetic recording head having the same structure as the magnetic head 2 for inspection as the magnetic head to be measured can be increased. can also be measured accurately.
発明の効果
以下の説明より明らかなように本発明によれ
ば、被測定の磁気ヘツドと検査用の磁気ヘツドの
ギヤツプ部の薄膜を検査用磁気ヘツドの透明なセ
ラミツクス製の支持体より確認して正確に互いに
接触させ、もしくは近接させ、検査用磁気ヘツド
のコイルに規準信号電流を印加し、相互誘導によ
り被測定の磁気ヘツドのコイルに発生する出力を
測定するようにしているので、電磁変換特性、特
に再生効率を機械的変動や外部誘導の影響を受け
ることなく、正確に測定して評価することができ
る。また検査用磁気ヘツドに印加する規準信号電
流を種々変えることにより被測定の磁気ヘツドの
再生効率を自由に、且つ容易に測定することがで
きるので、製造した磁気ヘツドの特性を正確に早
く知ることができる。Effects of the Invention As is clear from the following description, according to the present invention, the thin film at the gap between the magnetic head to be measured and the magnetic head for inspection can be confirmed from the transparent ceramic support of the magnetic head for inspection. By placing them in precise contact with each other or in close proximity to each other, applying a reference signal current to the coil of the magnetic head for inspection, and measuring the output generated in the coil of the magnetic head to be measured due to mutual induction, the electromagnetic conversion characteristics In particular, regeneration efficiency can be accurately measured and evaluated without being influenced by mechanical fluctuations or external induction. In addition, by varying the reference signal current applied to the magnetic head for inspection, the regeneration efficiency of the magnetic head under test can be measured freely and easily, making it possible to quickly and accurately determine the characteristics of the manufactured magnetic head. I can do it.
第１図は本発明の磁気ヘツド再生効率の評価法
の一実施例を説明するための図、第２図は従来の
磁気ヘツド再生効率の評価法の一例を説明するた
めの図、第３図は従来の磁気ヘツド再生効率の評
価法の例を説明するための図である。
１……被測定の磁気ヘツド、１１……薄膜、１
２……コイル、２……検査用磁気ヘツド、２１…
…コア、２２……薄膜、２３……コイル、３……
顕微鏡。
FIG. 1 is a diagram for explaining an embodiment of the magnetic head reproducing efficiency evaluation method of the present invention, FIG. 2 is a diagram for explaining an example of the conventional method for evaluating magnetic head reproducing efficiency, and FIG. 1 is a diagram for explaining an example of a conventional evaluation method of magnetic head reproducing efficiency. 1... Magnetic head to be measured, 11... Thin film, 1
2...Coil, 2...Magnetic head for inspection, 21...
... Core, 22 ... Thin film, 23 ... Coil, 3 ...
microscope.
Claims (1)
膜を挾み、この薄膜の回りに少しの間隔をとつて
コイルを巻付けて構成した検査用磁気ヘツドの前
記薄膜を被測定の磁気ヘツドの薄膜に接触させ、
もしくは近接させ、前記検査用磁気ヘツドのコイ
ルに規準信号電流を印加し、前記被測定の磁気ヘ
ツドのコイルに発生する出力を測定することを特
徴とする磁気ヘツド再生効率の評価法。1. Bringing the thin film of a magnetic head for inspection, which is constructed by sandwiching a thin film between supports made of transparent ceramics and winding a coil around the thin film with a small interval, into contact with the thin film of the magnetic head to be measured. ,
Alternatively, a method for evaluating the reproducing efficiency of a magnetic head is characterized in that the test magnetic head is placed close to the test magnetic head, a reference signal current is applied to the coil of the test magnetic head, and the output generated in the coil of the magnetic head to be measured is measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60081607A JPS61240425A (en) | 1985-04-17 | 1985-04-17 | Method for evaluating reproduction efficiency of magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60081607A JPS61240425A (en) | 1985-04-17 | 1985-04-17 | Method for evaluating reproduction efficiency of magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61240425A JPS61240425A (en) | 1986-10-25 |
| JPH0476174B2 true JPH0476174B2 (en) | 1992-12-02 |
Family
ID=13751002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60081607A Granted JPS61240425A (en) | 1985-04-17 | 1985-04-17 | Method for evaluating reproduction efficiency of magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61240425A (en) |
-
1985
- 1985-04-17 JP JP60081607A patent/JPS61240425A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61240425A (en) | 1986-10-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |