JPH0943130A - Device for estimating wear factor of magnetic head - Google Patents
Device for estimating wear factor of magnetic headInfo
- Publication number
- JPH0943130A JPH0943130A JP19635995A JP19635995A JPH0943130A JP H0943130 A JPH0943130 A JP H0943130A JP 19635995 A JP19635995 A JP 19635995A JP 19635995 A JP19635995 A JP 19635995A JP H0943130 A JPH0943130 A JP H0943130A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- piezoelectric element
- tape
- magnetic
- effective value
- 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
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁気ヘッドの摩耗係数
を実際に摩耗量を測定することなく、短時間で推定する
ことのできる磁気ヘッドの摩耗係数推定装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear coefficient estimating device for a magnetic head, which can estimate the wear coefficient of a magnetic head in a short time without actually measuring the wear amount.
【０００２】[0002]
【従来の技術】近年、ＶＴＲなどの磁気ヘッドと磁気テ
ープが接触走行することによって、情報の記録・再生を
行う装置においては、高画質化、長時間記録化、小型化
が図られている。例えば高画質化、小型化を実現するた
めに、磁気ヘッドにおいては、従来ヘッドの素材が単結
晶フェライトであったものを磁気ヘッドの磁気ギャップ
に磁性材金属を蒸着することなどにより磁気ヘッドの磁
気特性を向上したり、薄膜化したヘッド素材を張り合わ
せることによって磁気ヘッドの磁気特性を向上する方法
が実施されてきた。一方、磁気テープにおいては、磁気
テープの表面状態を改良することによって磁気ヘッドと
の接触状態を改善したり、磁気テープに塗布されている
磁性材の磁気特性を向上する、例えば、磁性材の素材を
酸化鉄から非酸化鉄のものに変更することによって磁気
特性の向上を図っている。また長時間記録化、小型化を
実現するためには、磁気テープを薄手にするなどの方法
が実施されている。2. Description of the Related Art In recent years, in a device for recording / reproducing information by causing a magnetic head such as a VTR and a magnetic tape to travel in contact with each other, high image quality, long-time recording, and downsizing have been attempted. For example, in order to realize high image quality and miniaturization, in the magnetic head, the magnetic material of the magnetic head is made by evaporating the magnetic material metal from the material of the conventional head which is single crystal ferrite in the magnetic gap of the magnetic head. Methods have been implemented to improve the magnetic characteristics of magnetic heads by improving the characteristics or by laminating thin film head materials. On the other hand, in a magnetic tape, by improving the surface condition of the magnetic tape, the contact state with the magnetic head is improved, and the magnetic characteristics of the magnetic material applied to the magnetic tape are improved. The magnetic properties are improved by changing from iron oxide to non-iron oxide. In order to realize recording for a long time and miniaturization, methods such as thinning the magnetic tape have been implemented.
【０００３】しかしながら、これらの取り組みはいずれ
も、磁気ヘッドと磁気テープの摩擦・摩耗の形態を従来
のものと変えることになる。その結果、このような磁気
ヘッド、あるいは磁気テープの開発には、磁気ヘッドと
磁気テープの摩耗特性を短時間で評価できる手法の開発
が必須となってきている。従来磁気ヘッドおよび磁気テ
ープの摩耗特性の評価は、実際に磁気ヘッドと磁気テー
プを一定時間接触走行させ、その後たとえば磁気ヘッド
の形状を測定する方法、また磁気ヘッドの質量を測定す
る方法等によって行われてきた。However, each of these approaches changes the form of friction and wear between the magnetic head and the magnetic tape from the conventional one. As a result, in order to develop such a magnetic head or magnetic tape, it is essential to develop a method capable of evaluating the wear characteristics of the magnetic head and the magnetic tape in a short time. Conventionally, the wear characteristics of magnetic heads and magnetic tapes are evaluated by actually running the magnetic heads and magnetic tapes in contact for a certain period of time, and then measuring the shape of the magnetic heads, or measuring the mass of the magnetic heads. I've been told.
【０００４】一方、圧電素子の出力信号の較正法として
は、質量が既知の硬球を落下させその衝突エネルギーを
用いて較正する方法、またシャープペンシルの芯を圧折
するときの解放エネルギーを用いて較正する方法などが
行われてきた。On the other hand, as a method of calibrating the output signal of the piezoelectric element, a method in which a hard sphere of known mass is dropped and calibrated by using its collision energy, and a release energy when the core of a mechanical pencil is pressed is used. Calibration methods have been used.
【０００５】[0005]
【発明が解決しようとする課題】このような従来の摩耗
特性の評価方法では、測定精度を十分に保つためには、
長時間の摩耗試験を行う必要があり、また、摩耗形態の
個体差が大きいために数多く評価を行う必要があった。
従って相当量の磁気テープが必要になるなど、評価に多
大なコストがかかるという問題点があった。また従来の
圧電素子の出力信号の較正法では、較正のために新たな
装置が必要なこと、また信号の入力部が磁気ヘッドのよ
うに非常に小さく、機械的強度も小さいものである場
合、非常に困難であるという問題点があった。In such a conventional method for evaluating wear characteristics, in order to maintain sufficient measurement accuracy,
It was necessary to carry out a long-term wear test, and it was necessary to evaluate a large number because the individual differences in wear forms were large.
Therefore, there is a problem in that a large amount of magnetic tape is required and the evaluation is very costly. Further, in the conventional method of calibrating the output signal of the piezoelectric element, if a new device is required for calibration, and if the signal input portion is very small like a magnetic head and the mechanical strength is also small, There was a problem that it was very difficult.
【０００６】本発明は、上述の点に鑑みてなされたもの
であって、容易でかつ短時間に磁気ヘッドと磁気テープ
の摩耗特性の評価を行うことができる磁気ヘッドの摩耗
係数推定装置を提供することを目的とする。The present invention has been made in view of the above points, and provides a wear coefficient estimating device for a magnetic head capable of easily evaluating the wear characteristics of the magnetic head and the magnetic tape in a short time. The purpose is to do.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記目的を達
成するために、少なくとも一つの磁気ヘッドを具備した
回転シリンダと、回転シリンダに螺旋状に一定の角度で
巻きつけられ走行するテープと、磁気ヘッド近傍あるい
は回転シリンダに搭載された圧電素子と、圧電素子の信
号を回転シリンダの外部に取り出す信号伝達手段と、圧
電素子の出力電圧の実効値を求める実効値測定手段を有
し、あらかじめ求めてある圧電素子の出力電圧の実効値
と磁気ヘッドの硬度、磁気ヘッドに加えられている垂直
力、磁気ヘッドの摩耗体積および磁気ヘッドとテープの
摺動距離から求められる磁気ヘッドの摩耗係数との相関
図から磁気ヘッドの摩耗係数を求める。In order to achieve the above object, the present invention provides a rotary cylinder having at least one magnetic head, and a tape which is spirally wound around a rotary cylinder at a constant angle. , A piezoelectric element mounted in the vicinity of the magnetic head or in the rotary cylinder, a signal transmission means for extracting the signal of the piezoelectric element to the outside of the rotary cylinder, and an effective value measuring means for obtaining the effective value of the output voltage of the piezoelectric element, The effective value of the output voltage of the piezoelectric element obtained, the hardness of the magnetic head, the vertical force applied to the magnetic head, the wear volume of the magnetic head, and the wear coefficient of the magnetic head obtained from the sliding distance between the magnetic head and the tape. The wear coefficient of the magnetic head is obtained from the correlation diagram of
【０００８】また本発明は、少なくとも一つの磁気ヘッ
ドを具備した回転シリンダと、回転シリンダに螺旋状に
一定の角度で巻きつけられ走行するテープと、磁気ヘッ
ド近傍あるいは回転シリンダに搭載された圧電素子と、
前記回転シリンダと一体的に回転し、前記回転シリンダ
の回転中心と同心円上に第１のコイルを捲装した軟磁性
材料からなる回転側磁性体と、該回転側磁性体と所定の
空隙を持って対向し、前記第１のコイルと対向する位置
に第２のコイルを捲装配設した軟磁性材料からなる固定
側磁性体と、圧電素子の出力電圧の実効値を求める実効
値測定手段を有し、あらかじめ求めてある圧電素子の出
力電圧の実効値と磁気ヘッドの硬度、磁気ヘッドに加え
られている垂直力、磁気ヘッドの摩耗体積および磁気ヘ
ッドとテープの摺動距離から求められる磁気ヘッドの摩
耗係数との相関図から磁気ヘッドの摩耗係数を求める。Further, according to the present invention, a rotary cylinder equipped with at least one magnetic head, a tape wound around the rotary cylinder at a constant angle and running, and a piezoelectric element mounted near the magnetic head or on the rotary cylinder. When,
A rotating magnetic body made of a soft magnetic material that rotates integrally with the rotating cylinder and has a first coil wound around a center of rotation of the rotating cylinder, and has a predetermined air gap with the rotating magnetic body. And a fixed-side magnetic body made of a soft magnetic material in which a second coil is wound and arranged at a position facing the first coil, and an effective value measuring means for obtaining an effective value of the output voltage of the piezoelectric element. Then, the effective value of the output voltage of the piezoelectric element and the hardness of the magnetic head, the vertical force applied to the magnetic head, the wear volume of the magnetic head, and the sliding distance between the magnetic head and the tape, which are obtained in advance, The wear coefficient of the magnetic head is obtained from the correlation diagram with the wear coefficient.
【０００９】また本発明は、複数の研磨性の異なったテ
ープを磁気ヘッドと接触走行させ、その時の圧電素子の
信号電圧の実効値と磁気ヘッドの硬度、磁気ヘッドに加
えられている垂直力、磁気ヘッドの摩耗体積および磁気
ヘッドとテープの摺動距離から求められる摩耗係数を用
いて、圧電素子の信号電圧の実効値と磁気ヘッドの摩耗
係数との較正式を求め、磁気ヘッドの摩耗係数を推定す
る。Further, according to the present invention, a plurality of tapes having different polishing properties are brought into contact with the magnetic head, and the effective value of the signal voltage of the piezoelectric element at that time, the hardness of the magnetic head, the vertical force applied to the magnetic head, Using the wear volume of the magnetic head and the wear coefficient obtained from the sliding distance between the magnetic head and the tape, find the calibration equation for the effective value of the signal voltage of the piezoelectric element and the wear coefficient of the magnetic head, and calculate the wear coefficient of the magnetic head. presume.
【００１０】また本発明は、同一のテープを複数回繰返
し磁気ヘッドと接触走行させ、その時の圧電素子の信号
電圧の実効値と磁気ヘッドの硬度、磁気ヘッドに加えら
れている垂直力、磁気ヘッドの摩耗体積および磁気ヘッ
ドとテープの摺動距離から求められる摩耗係数を用い
て、圧電素子の信号電圧の実効値と磁気ヘッドの摩耗係
数との較正式を求め、磁気ヘッドの摩耗係数を推定す
る。Further, according to the present invention, the same tape is repeatedly contacted with the magnetic head several times, and the effective value of the signal voltage of the piezoelectric element at that time and the hardness of the magnetic head, the vertical force applied to the magnetic head, the magnetic head. The wear coefficient of the magnetic head is estimated by calculating the calibration formula between the effective value of the signal voltage of the piezoelectric element and the wear coefficient of the magnetic head using the wear volume of the tape and the wear coefficient obtained from the sliding distance between the magnetic head and the tape. .
【００１１】また本発明は、同一のテープを複数の湿度
環境で磁気ヘッドと接触走行させ、その時の圧電素子の
信号電圧の実効値と磁気ヘッドの硬度、磁気ヘッドに加
えられている垂直力、磁気ヘッドの摩耗体積および磁気
ヘッドとテープの摺動距離から求められる摩耗係数を用
いて、圧電素子の信号電圧の実効値と磁気ヘッドの摩耗
係数との較正式を求め、磁気ヘッドの摩耗係数を推定す
る。According to the present invention, the same tape is run in contact with a magnetic head in a plurality of humidity environments, the effective value of the signal voltage of the piezoelectric element at that time, the hardness of the magnetic head, the vertical force applied to the magnetic head, Using the wear volume of the magnetic head and the wear coefficient obtained from the sliding distance between the magnetic head and the tape, find the calibration equation for the effective value of the signal voltage of the piezoelectric element and the wear coefficient of the magnetic head, and calculate the wear coefficient of the magnetic head. presume.
【００１２】[0012]
【作用】本発明の磁気ヘッドの摩耗係数推定装置によっ
て、磁気ヘッドの形状または質量を直接測定することな
く、短時間でかつ容易に磁気ヘッドの摩耗係数を推定す
ることを可能とする。The wear coefficient estimating device for a magnetic head according to the present invention makes it possible to easily estimate the wear coefficient of a magnetic head in a short time without directly measuring the shape or mass of the magnetic head.
【００１３】[0013]
（実施例１）以下本発明の実施例における磁気ヘッドの
摩耗係数推定装置を図を参照しながら説明する。図１は
本発明の第１の実施例における磁気ヘッドの摩耗係数推
定装置の原理図である。磁気ヘッド２が搭載されたヘッ
ド基台４は、回転シリンダ５に取り付けられている。図
２は圧電素子１取り付け部近傍の詳細図であり、ここで
は図２にしめすように、圧電素子１がヘッド基台４に搭
載されている場合で説明する。圧電素子は、加えられた
圧力を電気信号に変換する素子であり、たとえばＡＥセ
ンサ（Acoustic emission sensor）などがある。ヘッド
基台４に搭載されている磁気ヘッド２は回転シリンダ５
の外周面５ａより、数ミクロンから数十ミクロン突出し
ており、テープ３は回転シリンダ５および固定シリンダ
６に螺旋状に一定の角度、たとえば１８０度巻き付けら
れている。回転シリンダ５の上面には、スリップリング
支持台７が取り付けられている。またスリップリング支
持台７には少なくとも１つの圧電素子１からの出力を取
り出せるように、２つ以上のチャンネルを有したスリッ
プリング８が取り付けられている。スリップリング８に
は、スリップリング８と同様に２つ以上のチャンネルを
有したブラシ９が圧接されており、回転シリンダ５の回
転時も電気信号を安定して、回転シリンダ５の外部へ伝
達できるようになっている。そして必要に応じて、信号
増幅手段である高帯域アンプ１１および周波数制限手段
であるフィルタ１２を介して、実効値測定手段である実
効値メータ１３が接続されている。そして、たとえば図
３に示すような圧電素子１の出力電圧の実効値と磁気ヘ
ッド２の摩耗係数との相関図をあらかじめ用意してあ
る。以上の構成で、テープ３はキャプスタンシャフト
（図示せず）とピンチローラ（図示せず）の協動によっ
て走行している。そこで磁気ヘッド２を搭載した回転シ
リンダ５が回転軸１０の回転に伴い回転することによっ
て磁気ヘッド２とテープ３とが摺動する。この時ヘッド
基台４には圧電素子１が搭載されているので、磁気ヘッ
ド２とテープ３との摺動によって磁気ヘッド２に発生す
る弾性波の大きさに従った電圧が圧電素子１の出力端子
間に生じる。この弾性波は、磁気ヘッド２のテープ３と
の摺動面から摩耗粒子が脱落する際などに生じる。圧電
素子１に生じた電気信号は前記スリップリング８に導か
れる。複数の圧電素子１からの電気信号を取り出す場合
は圧電素子１の個数に２を乗じた数のチャンネルがあれ
ばよい。ただしアース線を共通に使用することも可能で
あるため圧電素子１の個数に１を加えた数のチャンネル
数でも十分である。スリップリング８で取り出された信
号電圧の実効値を実効値メータ１３で読みとり、その値
をたとえば図３ような相関図に照らし合わせることによ
って磁気ヘッド２の摩耗係数が推定できる。ただしこの
相関図は、本装置の構成によって異なるので、その装置
に特有のものをあらかじめ求めておく必要がある。なお
本実施例では、圧電素子１をヘッド基台４に搭載する場
合で説明したが、磁気ヘッド２に発生した弾性波が観測
できる範囲であれば、圧電素子１の搭載位置は回転シリ
ンダ５の上面等でもなんら問題はない。また信号伝達手
段としてスリップリング８とブラシ９を使用する方法で
説明したが、回転シリンダ５から外部に信号が伝達可能
であればいかなる手段を用いても良い。また搭載される
磁気ヘッド２については、磁気ヘッド２は、複数搭載さ
れていても装置の機能上問題はない。例えば複数の磁気
ヘッド２が搭載されており、摩耗係数を推定する必要が
ある磁気ヘッド２のみに圧電素子１を搭載することでそ
れぞれの磁気ヘッド２の摩耗を推定することが可能であ
る。実際に映像信号等を記録する回転シリンダには、一
般に複数の磁気ヘッドが搭載されている。それに対し、
特に回転シリンダ５に磁気ヘッド２をただ一つだけ搭載
することで、以下の様な効果を得ることができる。すな
わち、磁気ヘッド２がただ一つであるため、他の磁気ヘ
ッド２とテープ３の摺動による弾性波を圧電素子１が検
出することがない。したがって、磁気ヘッド２の摩耗係
数の推定の精度が向上するという効果がある。(Embodiment 1) Hereinafter, a wear coefficient estimating apparatus for a magnetic head according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a principle diagram of a wear coefficient estimating apparatus for a magnetic head according to a first embodiment of the present invention. A head base 4 on which the magnetic head 2 is mounted is attached to a rotary cylinder 5. FIG. 2 is a detailed view of the vicinity of the mounting portion of the piezoelectric element 1, and here, as shown in FIG. 2, the case where the piezoelectric element 1 is mounted on the head base 4 will be described. The piezoelectric element is an element that converts the applied pressure into an electric signal, and is, for example, an AE sensor (Acoustic emission sensor). The magnetic head 2 mounted on the head base 4 is a rotating cylinder 5.
The tape 3 projects several microns to several tens of microns from the outer peripheral surface 5a, and the tape 3 is spirally wound around the rotary cylinder 5 and the fixed cylinder 6 at a constant angle, for example, 180 degrees. A slip ring support 7 is attached to the upper surface of the rotary cylinder 5. Further, a slip ring 8 having two or more channels is attached to the slip ring support base 7 so that the output from at least one piezoelectric element 1 can be taken out. A brush 9 having two or more channels is pressed against the slip ring 8 in the same manner as the slip ring 8, and an electric signal can be stably transmitted to the outside of the rotary cylinder 5 even when the rotary cylinder 5 rotates. It is like this. If necessary, an effective value meter 13 as an effective value measuring means is connected via a high band amplifier 11 as a signal amplifying means and a filter 12 as a frequency limiting means. Then, for example, as shown in FIG. 3, a correlation diagram between the effective value of the output voltage of the piezoelectric element 1 and the wear coefficient of the magnetic head 2 is prepared in advance. With the above configuration, the tape 3 runs by the cooperation of a capstan shaft (not shown) and a pinch roller (not shown). Therefore, the rotary cylinder 5 carrying the magnetic head 2 rotates as the rotary shaft 10 rotates, so that the magnetic head 2 and the tape 3 slide. At this time, since the piezoelectric element 1 is mounted on the head base 4, a voltage according to the magnitude of the elastic wave generated in the magnetic head 2 by the sliding of the magnetic head 2 and the tape 3 is output from the piezoelectric element 1. It occurs between terminals. This elastic wave is generated when wear particles fall off the sliding surface of the magnetic head 2 with the tape 3. The electric signal generated in the piezoelectric element 1 is guided to the slip ring 8. When the electric signals from the plurality of piezoelectric elements 1 are taken out, the number of channels that is obtained by multiplying the number of the piezoelectric elements 1 by 2 is sufficient. However, since it is possible to commonly use the ground wire, the number of channels, which is the number of the piezoelectric elements 1 plus 1, is sufficient. The wear coefficient of the magnetic head 2 can be estimated by reading the effective value of the signal voltage taken out by the slip ring 8 with the effective value meter 13 and comparing the value with the correlation diagram as shown in FIG. 3, for example. However, since this correlation diagram differs depending on the configuration of this device, it is necessary to find a device specific to that device in advance. Although the piezoelectric element 1 is mounted on the head base 4 in this embodiment, the mounting position of the piezoelectric element 1 is set on the rotary cylinder 5 as long as the elastic wave generated in the magnetic head 2 is observable. There is no problem with the top surface. Further, although the method of using the slip ring 8 and the brush 9 as the signal transmitting means has been described, any means may be used as long as the signal can be transmitted from the rotary cylinder 5 to the outside. Regarding the magnetic heads 2 to be mounted, even if a plurality of magnetic heads 2 are mounted, there is no problem in the function of the device. For example, a plurality of magnetic heads 2 are mounted, and it is possible to estimate the wear of each magnetic head 2 by mounting the piezoelectric element 1 only on the magnetic heads 2 for which it is necessary to estimate the wear coefficient. Generally, a plurality of magnetic heads are mounted on a rotary cylinder for actually recording video signals and the like. For it,
In particular, by mounting only one magnetic head 2 on the rotary cylinder 5, the following effects can be obtained. That is, since there is only one magnetic head 2, the piezoelectric element 1 does not detect an elastic wave due to the sliding of the tape 3 with another magnetic head 2. Therefore, the accuracy of estimating the wear coefficient of the magnetic head 2 is improved.
【００１４】（実施例２）次に第２の実施例について説
明する。本実施例では、図１のフィルタ１２を遮断周波
数１ｋＨｚ以上の高周波通過型としている。圧電素子１
からの電気信号には本来の信号以外にも、多くのノイズ
信号が含まれており、特にそのノイズ成分は１ｋＨｚ以
下の低周波域で大きいことから、本発明では、フィルタ
１２の遮断周波数１ｋＨｚ以上の高周波通過型にするこ
とによって、ノイズ成分を十分に減衰させＳ／Ｎを向上
させることができる。このような手段によって、装置の
Ｓ／Ｎを向上させ、磁気ヘッド２の摩耗係数推定精度を
向上することができる。(Second Embodiment) Next, a second embodiment will be described. In this embodiment, the filter 12 shown in FIG. 1 is of a high frequency pass type having a cutoff frequency of 1 kHz or higher. Piezoelectric element 1
In addition to the original signal, many electrical noise signals are included in the electrical signal from the above, and since the noise component is particularly large in the low frequency region of 1 kHz or less, in the present invention, the cutoff frequency of the filter 12 is 1 kHz or more. By adopting the high frequency pass type, it is possible to sufficiently attenuate the noise component and improve the S / N. By such means, the S / N of the apparatus can be improved and the accuracy of wear coefficient estimation of the magnetic head 2 can be improved.
【００１５】（実施例３）次に第３の実施例について説
明する。図４は本実施例の磁気ヘッドの摩耗係数推定装
置の原理図である。第１の実施例と同様の構成要素につ
いては、同じ番号を付して説明を省略する。第１の実施
例との相違点は、圧電素子１に生じた電気信号を回転シ
リンダ５の外部に伝達するために、回転シリンダ５と一
体的に回転し、前記回転シリンダ５の回転中心と同軸に
第１のコイルを捲装した軟磁性材料からなる回転側磁性
体１４ａと、回転側磁性体１４ａと所定の空隙を持って
対向し、前記第１のコイルと対向する位置に第２のコイ
ルを捲装配設した軟磁性材料からなる固定側磁性体１４
ｂを有していることである。回転側磁性体１４ａと固定
側磁性体１４ｂは、少なくとも１つの圧電素子からの出
力を伝達できるように、２つ以上のチャンネルを有して
いる。複数の圧電素子からの信号を取り出す場合は圧電
素子の個数に２を乗じた数のチャンネルがあればよい。
ただしアースを共通に使用することも可能であるため圧
電素子の個数に１を加えた数のチャンネル数でも十分で
ある。(Embodiment 3) Next, a third embodiment will be described. FIG. 4 is a principle diagram of the wear coefficient estimating apparatus for a magnetic head of this embodiment. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The difference from the first embodiment is that in order to transmit the electric signal generated in the piezoelectric element 1 to the outside of the rotary cylinder 5, it rotates integrally with the rotary cylinder 5 and is coaxial with the rotation center of the rotary cylinder 5. The rotating-side magnetic body 14a made of a soft magnetic material having the first coil wound around it, and the rotating-side magnetic body 14a facing the rotating-side magnetic body 14a with a predetermined gap, and the second coil at a position facing the first coil. Fixed-side magnetic body 14 made of a soft magnetic material and wound around
It has b. The rotating-side magnetic body 14a and the fixed-side magnetic body 14b have two or more channels so that the output from at least one piezoelectric element can be transmitted. To take out signals from a plurality of piezoelectric elements, the number of channels that is obtained by multiplying the number of piezoelectric elements by 2 is sufficient.
However, since it is possible to use the ground in common, it is sufficient to use the number of channels, which is the number of piezoelectric elements plus one.
【００１６】ここで、回転側磁性体１４ａと固定側磁性
体１４ｂを用いると、以下の様な利点がある。すなわち
第１の実施例での説明で使用したスリップリングとブラ
シのように摺動して信号を伝達することがないので、摺
動ノイズが発生せず信号のＳ／Ｎが良好である。また回
転側磁性体１４ａと固定側磁性体１４ｂのコイルの巻数
比によって、回転側磁性体１４ａと固定側磁性体１４ｂ
に信号の電圧増幅機能をもたせることができる。たとえ
ば回転側磁性体１４ａと固定側磁性体１４ｂのコイルの
巻線比を一対二に設定すれば回転側磁性体１４ａと固定
側磁性体１４ｂで２倍の電圧増幅が可能になる。すなわ
ち高帯域アンプ１１の増幅率を小さく設定する、あるい
は高帯域アンプ１１を用いないことも可能となる。また
回転側磁性体１４ａと固定側磁性体１４ｂは、その特性
上、低周波域の信号を減衰させる効果があるため、測定
の精度等条件によってはフィルタ１２を省略することも
できる。The use of the rotating side magnetic body 14a and the fixed side magnetic body 14b has the following advantages. That is, since the signal is not transmitted by sliding like the slip ring and the brush used in the description of the first embodiment, sliding noise does not occur and the S / N of the signal is good. Further, depending on the winding turns ratio of the rotating side magnetic body 14a and the fixed side magnetic body 14b, the rotating side magnetic body 14a and the fixed side magnetic body 14b.
Can have a signal voltage amplifying function. For example, if the winding ratio of the coils of the rotating side magnetic body 14a and the fixed side magnetic body 14b is set to 1 to 2, double voltage amplification can be performed by the rotating side magnetic body 14a and the fixed side magnetic body 14b. That is, it is possible to set the amplification factor of the high band amplifier 11 to be small or not to use the high band amplifier 11. Further, the rotating-side magnetic body 14a and the stationary-side magnetic body 14b have the effect of attenuating the signal in the low frequency region due to their characteristics, so that the filter 12 may be omitted depending on the measurement accuracy and other conditions.
【００１７】（実施例４）次に本発明の磁気ヘッドの摩
耗係数推定装置における、圧電素子較正方法について説
明する。図５は、上記構成の装置を使用して研磨性の異
なるテープ３を走行させたときの実効値メータ１３の読
みとり値を縦軸にとり、実際に測定した磁気ヘッド２の
摩耗量から求めた磁気ヘッド２の摩耗係数ｋとテープ３
が磁気ヘッド２に加える垂直力Ｎと磁気ヘッド２とテー
プ３との摺動速度ｖの積ｋＮｖの平方根を横軸にとった
グラフである。このように両者は直線関係にあることが
わかる。すなわち両者の関係を式で表すと、(Embodiment 4) Next, a method of calibrating a piezoelectric element in the wear coefficient estimating apparatus for a magnetic head of the present invention will be described. In FIG. 5, the vertical axis is the reading value of the effective value meter 13 when the tapes 3 having different abrasivity are run by using the apparatus having the above-mentioned configuration, and the magnetic field is obtained from the actually measured wear amount of the magnetic head 2. Wear coefficient k of head 2 and tape 3
Is a graph in which the horizontal axis is the square root of the product kNv of the vertical force N applied to the magnetic head 2 and the sliding speed v of the magnetic head 2 and the tape 3. Thus, it can be seen that the two have a linear relationship. That is, if the relationship between the two is expressed by an equation,
【００１８】[0018]
【数１】 [Equation 1]
【００１９】のようになる。（数１）でαは、直線の傾
き、βは縦軸の切片である。一度このような装置の較正
を行えば、その後はどのような研磨性のテープ３を走行
させても、その時のテープ３が磁気ヘッド２に加える垂
直力Ｎとテープ３と磁気ヘッド２の摺動速度ｖを知るこ
とによって磁気ヘッド２の摩耗係数ｋが推定できる。こ
こでテープ３が磁気ヘッド２に加える垂直力Ｎは、歪ゲ
ージ等を利用して測定することができる。また磁気ヘッ
ド２が、較正時と変わっても、その硬度をビッカース硬
度計などで測定し、また磁気ヘッド２における弾性波の
減衰率を超音波などを用いて測定することによって換算
が可能である。It becomes as follows. In (Equation 1), α is the slope of the straight line, and β is the intercept of the vertical axis. Once such a device is calibrated, no matter what abrasive tape 3 is run thereafter, the vertical force N applied to the magnetic head 2 by the tape 3 at that time and the sliding of the tape 3 and the magnetic head 2 The wear coefficient k of the magnetic head 2 can be estimated by knowing the speed v. Here, the vertical force N applied to the magnetic head 2 by the tape 3 can be measured using a strain gauge or the like. Even if the magnetic head 2 is different from that at the time of calibration, it can be converted by measuring its hardness with a Vickers hardness tester or the like, and measuring the attenuation rate of the elastic wave in the magnetic head 2 using ultrasonic waves or the like. .
【００２０】まず本発明の第４の実施例における磁気ヘ
ッドの摩耗係数推定装置における、圧電素子１の較正方
法について説明する。較正に使用する装置は、実施例１
から３に記載された磁気ヘッドの摩耗係数推定装置を用
いるものとする。上記装置を用いて磁気ヘッド２に研磨
性が異なっている２種類のテープ３を接触走行させる。
この時それぞれの圧電素子１の信号電圧の実効値を実効
値メータ１３で読みとっておく。また各テープ３を走行
させたことによる磁気ヘッド２の実際の摩耗量を測定
し、磁気ヘッド２の摩耗係数を計算する。このとき磁気
ヘッド２の摩耗量測定は、摩耗前と摩耗後の磁気ヘッド
形状の変化、また質量の変化等によって測定する。かく
して（数１）において、テープ３が２種類であれば連立
方程式を解くことによってαとβが求めることができ
る。テープ３は３種類以上でもよく、それぞれのデータ
を最もよく満たしているαとβを、グラフ上で近似直線
を引く方法等で求めることができる。できるだけ多くの
研磨性の異なるテープ３を使用することによって、求め
るαとβの精度を向上することができる。もちろん短時
間で較正を行う場合は、２種類の研磨性の異なるテープ
３を使用すればよい。本発明の較正方法は、圧電素子１
の較正用に特別に装置を用意する必要がなく、低コスト
でかつ短時間の圧電素子１の較正が可能となる。First, a method of calibrating the piezoelectric element 1 in the wear coefficient estimating apparatus for a magnetic head according to the fourth embodiment of the present invention will be described. The apparatus used for the calibration is the example 1
It is assumed that the magnetic head wear coefficient estimating device described in any one of 1 to 3 is used. Using the above device, two types of tapes 3 having different abrasivity are brought into contact with the magnetic head 2 to travel.
At this time, the effective value of the signal voltage of each piezoelectric element 1 is read by the effective value meter 13. Further, the actual wear amount of the magnetic head 2 due to the running of each tape 3 is measured, and the wear coefficient of the magnetic head 2 is calculated. At this time, the amount of wear of the magnetic head 2 is measured by a change in shape of the magnetic head before and after wear, a change in mass, and the like. Thus, in (Equation 1), if there are two types of tapes 3, α and β can be obtained by solving the simultaneous equations. The tape 3 may be of three or more types, and α and β that best satisfy the respective data can be obtained by a method such as drawing an approximate straight line on the graph. By using as many tapes 3 having different abrasiveness as possible, the accuracy of the obtained α and β can be improved. Of course, when the calibration is performed in a short time, two types of tapes 3 having different polishing properties may be used. The calibration method of the present invention is applied to the piezoelectric element 1.
Therefore, it is possible to calibrate the piezoelectric element 1 at low cost and in a short time without preparing a special device for calibration.
【００２１】（実施例５）本発明の第５の実施例におけ
る磁気ヘッドの摩耗係数推定装置における、圧電素子１
の較正方法について説明する。較正に使用する装置は、
実施例１から３に記載された磁気ヘッドの摩耗係数推定
装置を用いるものとする。上記装置を用いて磁気ヘッド
２に同一のテープ３を複数回にわたって接触走行させ
る。本発明では、図６に示すように磁気ヘッド２の摩耗
係数、すなわちテープ３の研磨性が走行を繰り返すに従
って低下していくことを、利用している。この時それぞ
れの走行回数における圧電素子１の信号電圧の実効値を
実効値メータ１３で読みとっておく。またそれぞれの走
行回数のテープ３による磁気ヘッド２の実際の摩耗量を
測定し、磁気ヘッド２の摩耗係数を計算する。このとき
磁気ヘッド２の摩耗量測定は、摩耗前と摩耗後の磁気ヘ
ッド形状の変化、また質量の変化等によって測定する。
かくして（数１）において、テープ３の走行回数が２回
であれば連立方程式を解くことによってαとβが求めら
れ、また３回以上であれば、それぞれのデータを最もよ
く満たしているαとβを、グラフ上で近似直線を引く方
法等で求めることができる。できるだけ多くの走行回数
実験を行うことによって、求めるαとβの精度を向上す
ることができる。もちろん短時間で較正を行う場合は、
２回だけテープ３を走行させればよい。また連続した回
数のデータを使用しなくとも、たとえば１回目と５回目
の２つのデータのみを使用することも可能である。本発
明によれば、テープ３は一種類のみでよく少ないコスト
で圧電素子１の較正が可能となる。(Embodiment 5) A piezoelectric element 1 in a wear coefficient estimating apparatus for a magnetic head according to a fifth embodiment of the present invention.
The calibration method of will be described. The device used for calibration is
It is assumed that the wear coefficient estimating device for a magnetic head described in the first to third embodiments is used. Using the above device, the same tape 3 is made to contact and run on the magnetic head 2 a plurality of times. In the present invention, it is utilized that the wear coefficient of the magnetic head 2, that is, the abrasiveness of the tape 3 decreases as the running is repeated, as shown in FIG. At this time, the effective value of the signal voltage of the piezoelectric element 1 at each traveling number is read by the effective value meter 13. Further, the actual wear amount of the magnetic head 2 by the tape 3 at each running number is measured, and the wear coefficient of the magnetic head 2 is calculated. At this time, the amount of wear of the magnetic head 2 is measured by a change in shape of the magnetic head before and after wear, a change in mass, and the like.
Thus, in (Equation 1), if the number of times the tape 3 is run is two, α and β are obtained by solving simultaneous equations, and if it is three or more, α and β that best satisfy the respective data are obtained. β can be obtained by a method such as drawing an approximate straight line on the graph. The accuracy of the obtained α and β can be improved by conducting the experiment of the number of running times as much as possible. Of course, if you want to calibrate in a short time,
It suffices to run the tape 3 only twice. It is also possible to use only the two data of the first time and the fifth time without using the data of consecutive times. According to the present invention, only one type of tape 3 is required, and the piezoelectric element 1 can be calibrated at low cost.
【００２２】（実施例６）本発明の第６の実施例におけ
る磁気ヘッドの摩耗係数推定装置における、圧電素子１
の較正方法について説明する。較正に使用する装置は、
実施例１から３に記載された磁気ヘッドの摩耗係数推定
装置を用いるものとする。上記装置を用いて磁気ヘッド
２に同一のテープ３を複数の湿度の異なる環境で接触走
行させる。本発明では、図７に示すように磁気ヘッド２
の摩耗係数、すなわちテープ３の研磨性が湿度の増加に
従って上昇していくことを、利用している。この時それ
ぞれの湿度環境における圧電素子１の信号電圧の実効値
を実効値メータ１３で読みとっておく。またそれぞれの
湿度環境のテープ３による磁気ヘッド２の実際の摩耗量
を測定し、磁気ヘッド２の摩耗係数を計算する。このと
き磁気ヘッド２の摩耗量測定は、摩耗前と摩耗後の磁気
ヘッド形状の変化、また質量の変化等によって測定す
る。かくして（数１）において、湿度環境が２環境であ
れば連立方程式を解くことによってαとβが求められ、
また３環境以上であれば、それぞれのデータを最もよく
満たしているαとβを、グラフ上で近似直線を引く方法
等で求めることができる。できるだけ多くの湿度環境で
実験を行うことによって、またできるだけ研磨性の差が
大きな湿度環境を選択することによって求めるαとβの
精度を向上することができる。もちろん短時間で較正を
行う場合は、２環境だけでテープ３を走行させればよ
い。本発明によれば、テープ３は一種類のみでよく少な
いコストで圧電素子１の較正が可能となるとともに、同
一のテープ３でも湿度環境を変えることによって、大き
な研磨性の差を作り出すことができ、較正の精度が向上
する。(Embodiment 6) A piezoelectric element 1 in a wear coefficient estimating apparatus for a magnetic head according to a sixth embodiment of the present invention.
The calibration method of will be described. The device used for calibration is
It is assumed that the wear coefficient estimating device for a magnetic head described in the first to third embodiments is used. Using the above device, the same tape 3 is made to contact and run on the magnetic head 2 in a plurality of environments with different humidities. In the present invention, as shown in FIG.
It is utilized that the wear coefficient of, that is, the polishing property of the tape 3 increases as the humidity increases. At this time, the effective value of the signal voltage of the piezoelectric element 1 in each humidity environment is read by the effective value meter 13. Further, the actual wear amount of the magnetic head 2 due to the tape 3 in each humidity environment is measured, and the wear coefficient of the magnetic head 2 is calculated. At this time, the amount of wear of the magnetic head 2 is measured by a change in shape of the magnetic head before and after wear, a change in mass, and the like. Thus, in (Equation 1), if the humidity environment is two, α and β can be obtained by solving the simultaneous equations,
Further, if the environment is three or more, α and β that best satisfy the respective data can be obtained by a method of drawing an approximate straight line on the graph. The accuracy of α and β can be improved by conducting experiments in as many humidity environments as possible and by selecting a humidity environment in which the difference in polishability is as large as possible. Of course, when the calibration is performed in a short time, the tape 3 may be run in only two environments. According to the present invention, it is possible to calibrate the piezoelectric element 1 with only one type of tape 3 at a low cost, and even with the same tape 3, a large difference in abrasiveness can be created by changing the humidity environment. , The accuracy of calibration is improved.
【００２３】[0023]
【発明の効果】本発明によれば、テープ表面に圧電素子
を装着した磁気ヘッドを接触走行させ、圧電素子に発生
する信号電圧の実効値を測定し、あらかじめ求めてある
信号電圧の実効値と磁気ヘッドの摩耗係数との較正図に
より前記磁気ヘッドの摩耗係数を推定することができ
る。従って、本発明によれば、長時間の摩耗試験をする
ことなく、また測定も容易な、磁気ヘッドおよびテープ
の開発・改良の一環として適用可能な磁気ヘッドの摩耗
係数推定装置を提供することが可能となる。また本発明
によれば、圧電素子較正用に特別の装置を必要とせず、
低コストで高効率の磁気ヘッドの摩耗係数推定装置を提
供することが可能となる。According to the present invention, a magnetic head having a piezoelectric element mounted on the tape surface is brought into contact with the tape surface, and the effective value of the signal voltage generated in the piezoelectric element is measured. The wear coefficient of the magnetic head can be estimated from the calibration chart with the wear coefficient of the magnetic head. Therefore, according to the present invention, it is possible to provide an apparatus for estimating a wear coefficient of a magnetic head which can be easily measured without performing a long-time wear test and which can be applied as part of the development and improvement of a magnetic head and a tape. It will be possible. Further, according to the present invention, no special device is required for calibrating the piezoelectric element,
It is possible to provide a low-cost and highly efficient wear coefficient estimation device for a magnetic head.
【図１】本発明の第１の実施例における磁気ヘッドの摩
耗係数推定装置の原理図FIG. 1 is a principle diagram of an apparatus for estimating a wear coefficient of a magnetic head according to a first embodiment of the present invention.
【図２】本発明の第１の実施例における圧電素子取り付
け部周辺の詳細図FIG. 2 is a detailed view of the periphery of the piezoelectric element mounting portion in the first embodiment of the present invention.
【図３】本発明の第１の実施例における圧電素子信号電
圧の実効値と摩耗係数の較正図FIG. 3 is a calibration diagram of the effective value of the piezoelectric element signal voltage and the wear coefficient in the first embodiment of the present invention.
【図４】本発明の第２の実施例における磁気ヘッドの摩
耗係数推定装置の原理図FIG. 4 is a principle diagram of a wear coefficient estimating apparatus for a magnetic head according to a second embodiment of the present invention.
【図５】圧電素子の実効値と磁気ヘッドの摩耗係数ｋ、
テープが磁気ヘッドに加える垂直力Ｎおよび磁気ヘッド
とテープとの摺動速度ｖの積ｋＮｖの平方根との関係を
示す線図FIG. 5 is an effective value of a piezoelectric element and a wear coefficient k of a magnetic head,
A diagram showing the relationship between the vertical force N applied to the magnetic head by the tape and the square root of the product kNv of the sliding speed v between the magnetic head and the tape.
【図６】本発明の第５の実施例における磁気ヘッドの摩
耗係数と走行回数の関係を示す線図FIG. 6 is a diagram showing the relationship between the wear coefficient of a magnetic head and the number of running times in a fifth embodiment of the present invention.
【図７】本発明の第６の実施例における磁気ヘッドの摩
耗係数と湿度環境の関係を示す線図FIG. 7 is a diagram showing a relationship between a wear coefficient of a magnetic head and a humidity environment in a sixth embodiment of the present invention.
１ 圧電素子 ２ 磁気ヘッド ３ テープ ５ 回転シリンダ ７ スリップリング支持台 ８ スリップリング ９ ブラシ １２ フィルタ １３ 実効値メータ １４ａ 回転側磁性体 １４ｂ 固定側磁性体 DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Magnetic head 3 Tape 5 Rotating cylinder 7 Slip ring support 8 Slip ring 9 Brush 12 Filter 13 Effective value meter 14a Rotating side magnetic body 14b Fixed side magnetic body
Claims (6)
回転シリンダと、前記回転シリンダに螺旋状に一定の角
度で巻きつけられ走行するテープと、前記磁気ヘッド近
傍あるいは前記回転シリンダに搭載された圧電素子と、
前記圧電素子の信号を前記回転シリンダの外部に取り出
す信号伝達手段と、前記圧電素子の出力電圧の実効値を
求める実効値測定手段を有し、あらかじめ求めてある前
記圧電素子の出力電圧の実効値と、前記磁気ヘッドの硬
度、前記磁気ヘッドに加えられている垂直力、前記磁気
ヘッドの摩耗体積および前記磁気ヘッドと前記テープの
摺動距離から求められる前記磁気ヘッドの摩耗係数との
相関図から磁気ヘッドの摩耗係数を求めることを特徴と
した磁気ヘッドの摩耗係数推定装置。1. A rotary cylinder having at least one magnetic head, a tape wound around the rotary cylinder at a constant angle and running, and a piezoelectric element mounted near the magnetic head or mounted on the rotary cylinder. When,
An effective value of the output voltage of the piezoelectric element, which is obtained in advance, has signal transmission means for extracting the signal of the piezoelectric element to the outside of the rotary cylinder and effective value measuring means for obtaining the effective value of the output voltage of the piezoelectric element. And a correlation diagram of the hardness of the magnetic head, the vertical force applied to the magnetic head, the wear volume of the magnetic head, and the wear coefficient of the magnetic head obtained from the sliding distance between the magnetic head and the tape. An apparatus for estimating a wear coefficient of a magnetic head, characterized by obtaining a wear coefficient of a magnetic head.
る手段を有し、かつそれが遮断周波数１ＫＨｚ以上の高
周波通過型の周波数帯域制限手段であることを特徴とし
た請求項１記載の磁気ヘッドの摩耗係数推定装置。2. The magnetic head according to claim 1, further comprising means for limiting a frequency band of the output of the piezoelectric element, and the means is a high frequency pass type frequency band limiting means having a cutoff frequency of 1 kHz or higher. Wear coefficient estimation device.
回転シリンダと、前記回転シリンダに螺旋状に一定の角
度で巻きつけられ走行するテープと、前記磁気ヘッド近
傍あるいは前記回転シリンダに搭載された圧電素子と、
前記回転シリンダと一体的に回転し、前記回転シリンダ
の回転中心と同軸に第１のコイルを捲装した軟磁性材料
からなる回転側磁性体と、該回転側磁性体と所定の空隙
を持って対向し、前記第１のコイルと対向する位置に第
２のコイルを捲装配設した軟磁性材料からなる固定側磁
性体と、前記圧電素子の出力電圧の実効値を求める実効
値測定手段を有し、あらかじめ求めてある前記圧電素子
の出力電圧の実効値と、前記磁気ヘッドの硬度、前記磁
気ヘッドに加えられている垂直力、前記磁気ヘッドの摩
耗体積および前記磁気ヘッドと前記テープの摺動距離か
ら求められる前記磁気ヘッドの摩耗係数との相関図から
磁気ヘッドの摩耗係数を求めることを特徴とした磁気ヘ
ッドの摩耗係数推定装置。3. A rotary cylinder having at least one magnetic head, a tape wound around the rotary cylinder at a constant angle and running, and a piezoelectric element mounted near the magnetic head or mounted on the rotary cylinder. When,
A rotating magnetic body made of a soft magnetic material that rotates integrally with the rotating cylinder and has a first coil wound coaxially with the center of rotation of the rotating cylinder; and a predetermined gap with the rotating magnetic body. A fixed-side magnetic body made of a soft magnetic material having a second coil wound around and arranged at a position facing each other and the first coil, and an effective value measuring means for obtaining an effective value of the output voltage of the piezoelectric element are provided. Then, the effective value of the output voltage of the piezoelectric element obtained in advance, the hardness of the magnetic head, the vertical force applied to the magnetic head, the wear volume of the magnetic head, and the sliding of the magnetic head and the tape. A wear coefficient estimating device for a magnetic head, wherein a wear coefficient of a magnetic head is obtained from a correlation diagram with a wear coefficient of the magnetic head obtained from a distance.
ッドと接触走行させ、その時の圧電素子の信号電圧の実
効値と前記磁気ヘッドの硬度、前記磁気ヘッドに加えら
れている垂直力、前記磁気ヘッドの摩耗体積および前記
磁気ヘッドと前記テープの摺動距離から求められる摩耗
係数を用いて、前記圧電素子の信号電圧の実効値と前記
磁気ヘッドの摩耗係数との較正式を求めることを特徴と
した請求項１、請求項２および請求項３記載の磁気ヘッ
ドの摩耗係数推定装置。4. A plurality of tapes having different polishing properties are brought into contact with a magnetic head, and the effective value of the signal voltage of the piezoelectric element at that time, the hardness of the magnetic head, the vertical force applied to the magnetic head, and A calibration equation for the effective value of the signal voltage of the piezoelectric element and the wear coefficient of the magnetic head is obtained using the wear volume of the magnetic head and the wear coefficient obtained from the sliding distance between the magnetic head and the tape. The wear coefficient estimating device for a magnetic head according to any one of claims 1, 2 and 3.
と接触走行させ、各回数における圧電素子の信号電圧の
実効値と前記磁気ヘッドの硬度、前記磁気ヘッドに加え
られている垂直力、前記磁気ヘッドの摩耗体積および前
記磁気ヘッドと前記テープの摺動距離から求められる摩
耗係数を用いて、前記圧電素子の信号電圧の実効値と前
記磁気ヘッドの摩耗係数との較正式を求めることを特徴
とした請求項１、請求項２および請求項３記載の磁気ヘ
ッドの摩耗係数推定装置。5. The same tape is repeatedly contacted and run with a magnetic head a plurality of times, and the effective value of the signal voltage of the piezoelectric element at each time, the hardness of the magnetic head, the vertical force applied to the magnetic head, and the magnetic force. A calibration equation for the effective value of the signal voltage of the piezoelectric element and the wear coefficient of the magnetic head is obtained using the wear volume of the head and the wear coefficient obtained from the sliding distance between the magnetic head and the tape. The wear coefficient estimating device for a magnetic head according to any one of claims 1, 2 and 3.
ッドと接触走行させ、各湿度環境における圧電素子の信
号電圧の実効値と前記磁気ヘッドの硬度、前記磁気ヘッ
ドに加えられている垂直力、前記磁気ヘッドの摩耗体積
および前記磁気ヘッドと前記テープの摺動距離から求め
られる摩耗係数を用いて、前記圧電素子の信号電圧の実
効値と前記気ヘッドの摩耗係数との較正式を求めること
を特徴とした請求項１、請求項２および請求項３記載の
磁気ヘッドの摩耗係数推定装置。6. The same tape is run in contact with a magnetic head in a plurality of humidity environments, and the effective value of the signal voltage of the piezoelectric element in each humidity environment, the hardness of the magnetic head, and the vertical force applied to the magnetic head. Obtaining a calibration formula between the effective value of the signal voltage of the piezoelectric element and the wear coefficient of the air head by using the wear volume of the magnetic head and the wear coefficient obtained from the sliding distance between the magnetic head and the tape. The wear coefficient estimating device for a magnetic head according to claim 1, claim 2 or claim 3, characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19635995A JP3261934B2 (en) | 1995-08-01 | 1995-08-01 | Estimation device for wear coefficient of magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19635995A JP3261934B2 (en) | 1995-08-01 | 1995-08-01 | Estimation device for wear coefficient of magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0943130A true JPH0943130A (en) | 1997-02-14 |
| JP3261934B2 JP3261934B2 (en) | 2002-03-04 |
Family
ID=16356539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19635995A Expired - Fee Related JP3261934B2 (en) | 1995-08-01 | 1995-08-01 | Estimation device for wear coefficient of magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3261934B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8570678B2 (en) | 2011-11-18 | 2013-10-29 | Hewlett-Packard Development Company, L.P. | Determining tape head condition |
| CN110082238A (en) * | 2019-04-29 | 2019-08-02 | 南京理工大学 | A kind of ball screw assembly, resultant wear coefficient measuring method |
| CN110095367A (en) * | 2019-04-29 | 2019-08-06 | 南京理工大学 | A kind of lead screw raceway coefficient of waste measurement method |
| CN110095280A (en) * | 2019-04-29 | 2019-08-06 | 南京理工大学 | A kind of linear rolling guide resultant wear coefficient testing method |
| CN110108485A (en) * | 2019-04-29 | 2019-08-09 | 南京理工大学 | A kind of nut rolling way coefficient of waste measurement method |
-
1995
- 1995-08-01 JP JP19635995A patent/JP3261934B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8570678B2 (en) | 2011-11-18 | 2013-10-29 | Hewlett-Packard Development Company, L.P. | Determining tape head condition |
| CN110082238A (en) * | 2019-04-29 | 2019-08-02 | 南京理工大学 | A kind of ball screw assembly, resultant wear coefficient measuring method |
| CN110095367A (en) * | 2019-04-29 | 2019-08-06 | 南京理工大学 | A kind of lead screw raceway coefficient of waste measurement method |
| CN110095280A (en) * | 2019-04-29 | 2019-08-06 | 南京理工大学 | A kind of linear rolling guide resultant wear coefficient testing method |
| CN110108485A (en) * | 2019-04-29 | 2019-08-09 | 南京理工大学 | A kind of nut rolling way coefficient of waste measurement method |
| CN110095280B (en) * | 2019-04-29 | 2020-10-02 | 南京理工大学 | Comprehensive wear coefficient testing method for rolling linear guide rail pair |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3261934B2 (en) | 2002-03-04 |
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