JPH04105211A - Characteristic measuring instrument for magnetic head device - Google Patents

Characteristic measuring instrument for magnetic head device

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Publication number
JPH04105211A
JPH04105211A JP22112890A JP22112890A JPH04105211A JP H04105211 A JPH04105211 A JP H04105211A JP 22112890 A JP22112890 A JP 22112890A JP 22112890 A JP22112890 A JP 22112890A JP H04105211 A JPH04105211 A JP H04105211A
Authority
JP
Japan
Prior art keywords
recording
current
coil
circuit
magnetic head
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
JP22112890A
Other languages
Japanese (ja)
Inventor
Naoto Sugawara
直人 菅原
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP22112890A priority Critical patent/JPH04105211A/en
Publication of JPH04105211A publication Critical patent/JPH04105211A/en
Pending legal-status Critical Current

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  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE:To shorten measuring time by providing a means for current characteristic measurement to permit a current connected to a coil for recording, a coil for recording/reproduction, or a coil for erasure and whose magnitude changes successively in a prescribed period to flow on the coil. CONSTITUTION:The coil 1 for recording in a magnetic head device is wound across a core for recording/reproduction, and a source voltage V is applied to an intermediate tap. Also, the means for current characteristic measurement to permit the current connected to the coil 1 for recording and whose magnitude changes successively within the prescribed period to flow on the coil 1 for recording is comprised of a constant current circuit 5, a recording current amplifier circuit 6, and a recording current adjusting circuit 13. Thereby, the means for current characteristic measurement performs the measurement of the characteristic for the current in one time of operation in which the current whose magnitude changes successively in the prescribed period is permitted to flow. In such a way, the measuring time can be shortened.

Description

【発明の詳細な説明】 [産業上の利用分野コ この発明は例えばフロッピーディスクドライブ装置、ハ
ードディスクドライブ装置あるいはVTR装置などの磁
気ヘッド装置の電流特性を測定するための特性測定装置
に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a characteristic measuring device for measuring the current characteristics of a magnetic head device such as a floppy disk drive, a hard disk drive, or a VTR device.

[従来の技術] 第5図は従来のフロッピーディスクドライブ装置に塔載
された特性測定装置の記録電流発生回路を示すものであ
り、図において(1)は磁気ヘット装置における記録用
コイルで、記録再生用コアに巻回されており、中間タッ
プに電源電圧■が印加されるものである。(2)はコレ
クタかこの記録用コイル(1)の一端に接続されたトラ
ンジスタからなる第1の記録電流制御用スイッチング素
子、(3)はコレクタが上記記録用コイル(1)の他端
に接続されたトランジスタからなる第2の記録電流制御
用スイッチング素子で、エミッタが上記第1の記録電流
制御用スイッチング素子のエミッタに接続されているも
のである。(4)はライトデータ信号W/Dを受けて上
記記録用コイル(1)に流れる電流の方向を決定するた
めの相補的関係にあるスイッチング信号Q、Qを出力す
るフリップフロップF/Fで、スイッチング信号Qは上
記第1の記録電流制御用スイッチング素子(2)のベー
スに入力され、スイッチング信号Qは上記第2の記録電
流制御用スイッチング素子(3)のベースに入力される
。(5)は上記第1及び第2の記録電流制御用スイッチ
ング素子(2) (3)のエミッタに接続された定電流
回路で、例えば上記エミッタと接地との間に接続された
トランジスタを有したものである。(6)はこの定電流
回路の定電流値を決定するための記録電流増幅回路で、
ライトゲート信号W/Gを受けて活性化されるものであ
り、この例においてはフロッピーディスクドライブの一
周の書き込み時間である200m5の間、Lレベルにな
る期間活性化されるものであり、また、例えば上記定電
流回路(5)のトランジスタとミラー回路を構成するト
ランジスタを有したものである。(7)は上記電源電圧
■と上記記録電流増幅回路(6)との間に接続された記
録電流調整用抵抗で、電源電圧■から記録電流増幅回路
(6)に電流が流れるようにしたものであり、抵抗値を
可変にできるものである。
[Prior Art] Fig. 5 shows a recording current generating circuit of a characteristic measuring device mounted on a conventional floppy disk drive device. In the figure, (1) is a recording coil in a magnetic head device. It is wound around a reproducing core, and a power supply voltage (■) is applied to the center tap. (2) is a first recording current control switching element consisting of a transistor whose collector is connected to one end of the recording coil (1), and (3) is a collector whose collector is connected to the other end of the recording coil (1). The second recording current control switching element is a second recording current control switching element made of a transistor having an emitter connected to the emitter of the first recording current control switching element. (4) is a flip-flop F/F that receives the write data signal W/D and outputs complementary switching signals Q and Q for determining the direction of the current flowing through the recording coil (1); The switching signal Q is input to the base of the first recording current control switching element (2), and the switching signal Q is input to the base of the second recording current control switching element (3). (5) is a constant current circuit connected to the emitters of the first and second recording current control switching elements (2) and (3), and includes, for example, a transistor connected between the emitters and ground. It is something. (6) is a recording current amplification circuit for determining the constant current value of this constant current circuit,
It is activated in response to the write gate signal W/G, and in this example, it is activated while it is at L level for 200 m5, which is the writing time of one round of the floppy disk drive. For example, it includes a transistor of the constant current circuit (5) and a transistor forming a mirror circuit. (7) is a recording current adjustment resistor connected between the power supply voltage (■) and the recording current amplification circuit (6), so that current flows from the power supply voltage (■) to the recording current amplification circuit (6). The resistance value can be made variable.

次に、この様に構成された磁気ヘッド装置の特性測定装
置の動作について説明する。まずフリップフロップ回路
(4)がライトデータ信号W/Dを受けてスイッチング
信号Q、Qを出力し、第1及び第2の記録電流制御用ス
イッチング素子(2) (3)のオン/オフ制御を行な
い、記録電流が流れる記録用コイル(1)を選択する。
Next, the operation of the characteristic measuring apparatus for a magnetic head device configured as described above will be explained. First, the flip-flop circuit (4) receives the write data signal W/D and outputs the switching signals Q, Q, and performs on/off control of the first and second recording current control switching elements (2) and (3). and select the recording coil (1) through which the recording current flows.

一方、ライトゲート信号W/GのLレベルを受けた記録
電流増幅回路(6)は活性化され、電源電圧Vから記録
電流調整用抵抗(7)の抵抗値に応した電流が流れ、定
電流回路(5)に一定の電流IW。を流せ得る状態にす
る。
On the other hand, upon receiving the L level of the write gate signal W/G, the recording current amplification circuit (6) is activated, and a current flows from the power supply voltage V according to the resistance value of the recording current adjustment resistor (7), resulting in a constant current. Constant current IW in circuit (5). Make it possible to flow.

その結果、電源電圧Vから記録用コイル(1)→第1の
記録電流制御用スイッチング素子(2)→定電流回路(
5)へ記録電流+IW、が、記録用コイル(1)→第2
の記録電流制御用スイッチング素子(3)→定電流回路
(5)へ記録電流−IW、が交互に流れ、第6図(a)
に示すような記録電流が記録用コイル(1)に流れるこ
とになる。この記録電流によって記録媒体に記録する。
As a result, from the power supply voltage V, the recording coil (1) → the first recording current control switching element (2) → the constant current circuit (
5) The recording current + IW is transferred from the recording coil (1) to the second
The recording current -IW alternately flows from the recording current control switching element (3) to the constant current circuit (5), as shown in FIG. 6(a).
A recording current as shown in will flow through the recording coil (1). Recording is performed on the recording medium using this recording current.

次に記録電流調整用抵抗(7)の抵抗値を変えて定電流
回路(5)に流れる定電流値を変え、上記と同様にして
記録用コイル(1)に記録電流を流し、記録媒体に記録
する。この様にして定電流回路(5)に流し得る定電流
値を8度変えて記録媒体に記録する。その後、この様に
して記録媒体に記録された情報を再生して、記録電流I
Wに対する再生出力を得ると、第7図に示した再生出力
特性が得られるものである。
Next, change the resistance value of the recording current adjustment resistor (7) to change the value of the constant current flowing through the constant current circuit (5), and in the same manner as above, flow the recording current through the recording coil (1) and apply it to the recording medium. Record. In this way, the constant current value that can be passed through the constant current circuit (5) is changed by 8 degrees and recorded on the recording medium. After that, the information recorded on the recording medium in this manner is reproduced, and the recording current I
When the reproduction output for W is obtained, the reproduction output characteristics shown in FIG. 7 are obtained.

[発明が解決しようとする課題] しかるに、上記のように構成された従来の磁気ヘット装
置の特性測定装置にあっては、記録電流調整用抵抗(7
)の抵抗値を複数回、上記例では8回、変えて記録電流
による記録動作を行なう必要があり、時間と手間が掛か
るという問題点を有しているものであった。
[Problems to be Solved by the Invention] However, in the conventional characteristic measuring device for a magnetic head device configured as described above, the recording current adjustment resistor (7
) It is necessary to change the resistance value of the recording current a plurality of times, eight times in the above example, and perform a recording operation using a recording current, which is problematic in that it takes time and effort.

この発明は上記した点に鑑みてなされたものであり、測
定時間を大幅に短縮できる磁気ヘット装置の特性測定装
置を得ることを目的とするものである。
The present invention has been made in view of the above-mentioned points, and an object of the present invention is to obtain a characteristic measuring device for a magnetic head device that can significantly shorten measurement time.

[課題を解決するための手段] この発明に係わる磁気ヘッド装置の特性測定装置は、磁
気ヘッド装置の記録用コイル、記録再生用コイルまたは
消去用コイルに接続され、所定期間内に大きさが連続的
に変化する電流を上記コイルに流すための電流特性測定
用手段を設けたものである。
[Means for Solving the Problems] A characteristic measuring device for a magnetic head device according to the present invention is connected to a recording coil, a recording/reproducing coil, or an erasing coil of a magnetic head device, and is connected to a recording coil, a recording/reproducing coil, or an erasing coil of a magnetic head device, and is connected to a recording coil, a recording/reproducing coil, or an erasing coil of a magnetic head device, and is connected to a recording coil, a recording/reproducing coil, or an erasing coil of a magnetic head device. A means for measuring current characteristics is provided for passing a current that changes over the coil through the coil.

[作 用] この発明においては、電流特性測定用手段が所定期間内
に大きさが連続的に変化する電流をコイルに流すように
した1回の動作にて電流に対する特性の測定を可能なら
しめる。
[Function] In the present invention, the current characteristic measuring means makes it possible to measure the characteristics with respect to the current in one operation in which the current whose magnitude changes continuously within a predetermined period is passed through the coil. .

[実施例] 第1図はこの発明の一実施例を示すものであり、図にお
いて、(1)は磁気ヘッド装置における記録用コイルで
、記録再生用コアに巻回されており、中間タップに電源
電圧Vが印加されるものである。
[Embodiment] Fig. 1 shows an embodiment of the present invention. In the figure, (1) is a recording coil in a magnetic head device, which is wound around a recording/reproducing core, and is connected to an intermediate tap. A power supply voltage V is applied thereto.

(2)はコレクタがこの記録用コイル(1)の一端に接
続されたトランジスタからなる第1の記録電流制御用ス
イッチング素子、(3)はコレクタが上記記録用コイル
(1)の他端に接続されたトランジスタからなる第2の
記録電流制御用スイッチング素子で、エミッタが上記第
1の記録電流制御用スイッチング素子のエミッタに接続
されているものである。(4)はライトデータ信号W/
Dを受けて上記記録用コイル(1)に流れる電流の方向
を決定するための相補的関係にあるスイッチング信号Q
、 Qを出力するフリップフロップF/Fで、スイッチ
ング信号Qは上記第1の記録電流制御用スイッチング素
子(2)のベースに入力され、スイッチング信号Qは上
記第2の記録電流制御用スイッチング素子(3)のベー
スに入力される。(5)は上記第1及び第2の記録電流
制御用スイッチング素子(2) (3)のエミッタに接
続された定電流回路で、例えば上記エミッタと接地との
間に接続されたトランジスタを有したものである。(6
)はこの定電流回路(5)の定電流値を決定するための
記録電流増幅回路で、この実施例においては例えば上記
定電流回路(5)のトランジスタとミラー回路を構成す
るトランジスタを有したものであり、上記第1及び第2
の記録電流制御用スイッチング素子(2)(3)、フリ
ップフロップ回路(4)及び定電流回路(5)とともに
り−ド/ライトIC内に収められているものである。
(2) is a first recording current control switching element consisting of a transistor whose collector is connected to one end of the recording coil (1), and (3) is a collector connected to the other end of the recording coil (1). The second recording current control switching element is a second recording current control switching element made of a transistor having an emitter connected to the emitter of the first recording current control switching element. (4) is the write data signal W/
A complementary switching signal Q for determining the direction of the current flowing through the recording coil (1) in response to D;
, Q, the switching signal Q is input to the base of the first recording current control switching element (2), and the switching signal Q is input to the base of the second recording current control switching element (2). 3) is input to the base. (5) is a constant current circuit connected to the emitters of the first and second recording current control switching elements (2) and (3), and includes, for example, a transistor connected between the emitters and ground. It is something. (6
) is a recording current amplification circuit for determining the constant current value of this constant current circuit (5), and in this embodiment, for example, it has a transistor constituting a mirror circuit with the transistor of the constant current circuit (5). and the above first and second
The recording current control switching elements (2) and (3), a flip-flop circuit (4), and a constant current circuit (5) are housed in a read/write IC.

(13)は、上記定電流回路(5)が流し得る定電流値
IWを所定期間内連続的に変化するように上記記録電流
増幅回路(6)を制御する記録電流調整回路で、上記電
源電圧Vに一端が接続された記録電流調整用抵抗(7)
と、この記録電流調整用抵抗(7)の他端と上記記録電
流増幅回路(6)との間に接続された電流制御用トラン
ジスタ(8)と、この電流制御用トランジスタ(8)の
ベースに一端が接続されたベース電流制限用抵抗(9)
と、このベース電流制限用抵抗(9)の他端と上記電源
電圧■との間に接続された放電用抵抗(10)と、この
放電用抵抗(10)に並列接続された充放電用コンデン
サ(11)と、アノードが上記ベース電流制限用抵抗(
9)の他端に接続されるとともにカソードに第2図(a
)に示したライトゲート信号W/Gが印加されるダイオ
ード素子(12)とから構成されているものである。
(13) is a recording current adjustment circuit that controls the recording current amplifier circuit (6) so as to continuously change the constant current value IW that the constant current circuit (5) can flow within a predetermined period; Recording current adjustment resistor (7) with one end connected to V
and a current control transistor (8) connected between the other end of this recording current adjustment resistor (7) and the recording current amplification circuit (6), and a current control transistor (8) connected to the base of this current control transistor (8). Base current limiting resistor (9) connected at one end
, a discharging resistor (10) connected between the other end of this base current limiting resistor (9) and the power supply voltage (■), and a charging/discharging capacitor connected in parallel to this discharging resistor (10). (11), and the anode is the base current limiting resistor (
9) is connected to the other end and connected to the cathode in Fig. 2 (a).
) and a diode element (12) to which the write gate signal W/G shown in FIG.

なお、上記定電流回路(5)、記録電流増幅回路(6)
及び記録電流調整回路(13)によって、記録用コイル
(1)に接続され、所定期間内に大きさが連続的に変化
する電流を上記記録用コイル(1)に流すための電流特
性測定用手段を構成しているものである。
Note that the constant current circuit (5) and the recording current amplification circuit (6)
and current characteristic measuring means connected to the recording coil (1) by a recording current adjustment circuit (13), for causing a current whose magnitude changes continuously within a predetermined period to flow through the recording coil (1). This is what makes up the .

次に、この様に構成された磁気ヘット装置の特性測定装
置の動作について説明する。まず、フリップフロップ回
路(4)がライトデータ信号W/Dを受けてスイッチン
グ信号Q、Qを出力し、第1及び第2の記録電流制御用
スイッチング素子(2)(3)のオン/オフ制御を行な
い、記録電流が流れる記録用コイル(1)を選択する。
Next, the operation of the characteristic measuring device for a magnetic head device configured as described above will be explained. First, the flip-flop circuit (4) receives the write data signal W/D and outputs the switching signals Q, Q to control the on/off of the first and second recording current control switching elements (2) and (3). and select the recording coil (1) through which the recording current flows.

一方、第2図(a)に示すライトゲート信号W/GのL
レベルを受けた記録電流調整回路(13)の電流制御用
トランジスタ(8)は完全なオン状態となり、電源電圧
■から記録電流調整用抵抗(7)の抵抗値に応じた電流
がこの電流制御用トランジスタ(8)を介して記録電流
増幅回路(6)に流れ、定電流回路(5)に一定の電流
IW、を流せ得る状態にする。その結果、電源電圧Vか
ら記録用コイル(1)→第1の記録電流制御用スイッチ
ング素子(2)→定電流回路(5)へ記録電流+IW0
が、記録用コイル(1)→第2の記録電流制御用スイッ
チング素子(3)→定電流回路(5)へ記録電流−IW
、が交互に流れ、第2図(d)に示すような記録電流が
記録用コイル(1)に流れることになる。そして、第2
図(a)に示すようにライトゲート信号W/GがHレベ
ルに変化すると、ベース電流制限用抵抗(9)、放電用
抵抗(10)及び充放電用コンデンサ(1])によって
ノードNの電位、つまり、電流制御用トランジスタ(8
)のベース電位は、第2図(e)に示すように徐々に上
昇し始める。
On the other hand, the L of the write gate signal W/G shown in FIG. 2(a)
Upon receiving the level, the current control transistor (8) of the recording current adjustment circuit (13) becomes completely on, and a current corresponding to the resistance value of the recording current adjustment resistor (7) is applied from the power supply voltage to this current control transistor. The current IW flows through the recording current amplifier circuit (6) through the transistor (8), and is brought into a state where a constant current IW can flow through the constant current circuit (5). As a result, from the power supply voltage V, a recording current +IW0 is transferred from the recording coil (1) to the first recording current control switching element (2) to the constant current circuit (5).
However, the recording current -IW is transferred from the recording coil (1) to the second recording current control switching element (3) to the constant current circuit (5).
, flow alternately, and a recording current as shown in FIG. 2(d) flows through the recording coil (1). And the second
As shown in Figure (a), when the write gate signal W/G changes to H level, the potential of node N is , that is, the current control transistor (8
) begins to gradually rise as shown in FIG. 2(e).

その結果、電流制御用トランジスタ(8)は完全なオン
状態から導通度が低くなっていく。従って、電源電圧V
から記録電流調整用抵抗(7)及び電流制御用トランジ
スタ(8)を介して記録電流増幅回路(6)に流れ込む
電流が小さくなり、定電流回路(5)にて流せ得る定電
流値IWも小さくなり、記録用コイル(1)に流れる記
録電流も第2図(d)に示すように徐々にかつ連続的に
小さくなるものである。この様にして得られた第2図(
d)に示す記録電流によって記録媒体に記録する。その
後、この様にして記録媒体に記録された情報を再生して
、記録電流IWに対する再生出力を得ると、第3図に示
した再生出力特性が得られるものである。この第3図に
示した再生出力特性における再生電圧のエンベロープを
取ると、第4図に示した記録電流特性図が得られること
になる。
As a result, the degree of conductivity of the current control transistor (8) decreases from a completely on state. Therefore, the power supply voltage V
Therefore, the current flowing into the recording current amplifier circuit (6) through the recording current adjustment resistor (7) and the current control transistor (8) becomes smaller, and the constant current value IW that can be passed through the constant current circuit (5) also becomes smaller. Therefore, the recording current flowing through the recording coil (1) also gradually and continuously decreases as shown in FIG. 2(d). Figure 2 obtained in this way (
Recording is performed on the recording medium using the recording current shown in d). Thereafter, when the information recorded on the recording medium in this manner is reproduced and a reproduction output corresponding to the recording current IW is obtained, the reproduction output characteristics shown in FIG. 3 are obtained. If the envelope of the reproduction voltage in the reproduction output characteristic shown in FIG. 3 is taken, the recording current characteristic diagram shown in FIG. 4 will be obtained.

つまり、上記実施例のものにあっては、1度の記録動作
を行なうことによって再生出力特性及び記録電流特性が
得られるものである。
That is, in the above embodiment, the reproduction output characteristics and the recording current characteristics can be obtained by performing one recording operation.

なお、上記実施例においては、記録電流調整回路(13
)を放′市用抵抗(lO)及び充放電用コンデンサ(1
1)による電圧減衰回路を用いたものとしたか、電圧減
衰回路の代わりに、徐々に電圧が変化する発振回路を用
いても同様な効果を奏するものである。
Note that in the above embodiment, the recording current adjustment circuit (13
), the release resistor (lO) and the charge/discharge capacitor (lO)
The same effect can be achieved by using the voltage attenuation circuit according to 1), or by using an oscillation circuit in which the voltage gradually changes instead of the voltage attenuation circuit.

また、上記実施例においては、記録電流と出力特性との
関係について説明したが、記録電流に対するピークシフ
ト特性、再生した時に生じるSZN比を測定することに
よって求められるオーバーライド特性、及びアシンメト
リ特性などの測定に用いても同様の効果を奏するもので
ある。
In addition, in the above embodiment, the relationship between the recording current and the output characteristics was explained, but the measurement of the peak shift characteristic with respect to the recording current, the override characteristic obtained by measuring the SZN ratio that occurs during reproduction, the asymmetry characteristic, etc. The same effect can be achieved even when used in

さらに、上記実施例にあっては、記録用コイル(1)の
特性測定用に用いたものとしたが、記録再生用コイルに
用いても良く、消去用コイルに用いてイレーズ電流特性
の測定に用いても同様の効果を奏するものである。
Furthermore, in the above embodiment, it was used to measure the characteristics of the recording coil (1), but it may also be used as a recording/reproducing coil, or as an erasing coil to measure the erase current characteristics. Even if used, the same effect can be achieved.

またさらに、記録電流調整回路(13)を動作させるた
めの信号としてライトゲート信号W/Gを用いたものと
したが、これに限られるものではなく、任意のケート信
号を用いても良いものである。
Furthermore, although the write gate signal W/G is used as a signal for operating the recording current adjustment circuit (13), the present invention is not limited to this, and any gate signal may be used. be.

[発明の効果コ この発明は、以上に述へたように、磁気ヘット装置の記
録用コイル、記録再生用コイルまたは消去用コイルに接
続され、所定期間内に大きさか連続的に変化する電流を
上記コイルに流すための電流特性測定用手段を設けたの
で、測定時間が短縮でき、効率よく測定ができるという
効果を有するものである。
[Effects of the Invention] As described above, the present invention provides a magnetic head device that is connected to the recording coil, recording/reproducing coil, or erasing coil of a magnetic head device, and that generates a current that changes continuously in magnitude within a predetermined period of time. Since a means for measuring current characteristics is provided to flow through the coil, the measurement time can be shortened and the measurement can be carried out efficiently.

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

第1図はこの発明の一実施例を示す回路図、第2図は第
1図に示したものの各部の波形を示す波形図、第3図は
第1図に示したものによって記録された情報を再生した
再生出力特性を示す図、第4図は第3図の特性から再生
電圧のエンベロープを取って得た記録電流特性を示す図
、第5図は従来の磁気ヘッド装置の特性測定装置を示す
回路図、第6図は第5図に示したものの記録電流波形を
示す波形図、第7図は第5図に示したものを8度操作し
て記録した情報を再生した得られた再生出力特性を示す
図である。 図において、(1)は記録用コイル、(2)(3)は第
1及び第2の記録電流制御用スイッチング素子、(4)
はフリップフロップ回路、(5)は定電流回路(電流特
性測定用手段)、(6)は記録電流増幅回路(電流特性
測定用手段)、(13)は記録電流調整回路(電流特性
測定用手段)である。 なお、各図中同一符号は同−又は相当部分を示す。 第1図 j Sこ珠ε筬J用竪回蕗 第 図 館 図 図 第 図 舘 一一一−200m se c 第 閏
Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a waveform diagram showing waveforms of various parts of the device shown in Fig. 1, and Fig. 3 is information recorded by the device shown in Fig. 1. Figure 4 is a diagram showing the recording current characteristics obtained by taking the envelope of the reproduction voltage from the characteristics in Figure 3. Figure 5 is a diagram showing the characteristics measuring device of a conventional magnetic head device. 6 is a waveform diagram showing the recording current waveform of the one shown in FIG. 5, and FIG. 7 is a waveform diagram showing the recording current waveform of the one shown in FIG. FIG. 3 is a diagram showing output characteristics. In the figure, (1) is a recording coil, (2) and (3) are first and second recording current control switching elements, and (4) is a recording coil.
is a flip-flop circuit, (5) is a constant current circuit (means for measuring current characteristics), (6) is a recording current amplification circuit (means for measuring current characteristics), and (13) is a recording current adjustment circuit (means for measuring current characteristics). ). Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 1 j Vertical turntable for J

Claims (1)

【特許請求の範囲】[Claims] 磁気ヘッド装置の記録用コイル、記録再生用コイルまた
は消去用コイルに接続され、所定期間内に大きさが連続
的に変化する電流を上記コイルに流すための電流特性測
定用手段を備えた磁気ヘッド装置の特性測定手段。
A magnetic head connected to a recording coil, a recording/reproducing coil, or an erasing coil of a magnetic head device, and equipped with a current characteristic measuring means for causing a current whose magnitude changes continuously within a predetermined period to flow through the coil. A means of measuring the characteristics of the device.
JP22112890A 1990-08-24 1990-08-24 Characteristic measuring instrument for magnetic head device Pending JPH04105211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22112890A JPH04105211A (en) 1990-08-24 1990-08-24 Characteristic measuring instrument for magnetic head device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22112890A JPH04105211A (en) 1990-08-24 1990-08-24 Characteristic measuring instrument for magnetic head device

Publications (1)

Publication Number Publication Date
JPH04105211A true JPH04105211A (en) 1992-04-07

Family

ID=16761897

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22112890A Pending JPH04105211A (en) 1990-08-24 1990-08-24 Characteristic measuring instrument for magnetic head device

Country Status (1)

Country Link
JP (1) JPH04105211A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0684148A (en) * 1992-09-01 1994-03-25 Tdk Corp Method and apparatus for inspecting magnetoresistance head
JPH0684147A (en) * 1992-09-02 1994-03-25 Tdk Corp Method and apparatus for inspecting magnetoresistance head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0684148A (en) * 1992-09-01 1994-03-25 Tdk Corp Method and apparatus for inspecting magnetoresistance head
JPH0684147A (en) * 1992-09-02 1994-03-25 Tdk Corp Method and apparatus for inspecting magnetoresistance head

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