JP2677680B2 - Magnetic recording / reproducing device - Google Patents
Magnetic recording / reproducing deviceInfo
- Publication number
- JP2677680B2 JP2677680B2 JP21351389A JP21351389A JP2677680B2 JP 2677680 B2 JP2677680 B2 JP 2677680B2 JP 21351389 A JP21351389 A JP 21351389A JP 21351389 A JP21351389 A JP 21351389A JP 2677680 B2 JP2677680 B2 JP 2677680B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- magnetic
- curvature
- radius
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、デイジタルオーデイオテープレコーダや
ビデオテープレコーダなどに適用されるもので、磁気テ
ープに情報を斜めに分割して記録し再生する回転ヘツド
式で、回転ヘツドドラムの外径が15mm以上42mm未満であ
る磁気記録再生装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is applied to a digital audio tape recorder, a video tape recorder and the like, and is a rotary head for recording and reproducing information by obliquely dividing information on a magnetic tape. The present invention relates to a magnetic recording / reproducing apparatus in which the outer diameter of the rotary head drum is 15 mm or more and less than 42 mm.
［従来の技術］ 第３図は例えばデイジタルオーデイオテープレコーダ
などの磁気記録再生装置の一般的な構成を示す平面図で
ある。同図において、（10）はカセツト、（11）は供給
側リール、（12）は巻取側リール、（13）は磁気テープ
であり、実線がテープの巻き始めの状態、点線が巻き終
りの状態を示す。[Prior Art] FIG. 3 is a plan view showing a general configuration of a magnetic recording / reproducing apparatus such as a digital audio tape recorder. In the figure, (10) is a cassette, (11) is a supply-side reel, (12) is a take-up reel, and (13) is a magnetic tape. The solid line indicates the tape winding start state, and the dotted line indicates the winding end. Indicates the status.
（21）は上記磁気テープ（13）の走行ガイド、（22）
は上記磁気テープ（13）の張力を制御するように揺動可
能に設けられた張力制御ガイド、（23）はガイドロー
ラ、（24）はスラントガイド、（25）は一定速度で回転
するキヤプスタン、（26）は上記磁気テープ（13）を上
記キヤプスタン（25）に押しつけて摩擦走行させるピン
チローラ、（30）は回転ヘツドドラムである。(21) is a guide for running the magnetic tape (13), (22)
Is a tension control guide swingably provided to control the tension of the magnetic tape (13), (23) is a guide roller, (24) is a slant guide, and (25) is a capstan rotating at a constant speed, (26) is a pinch roller that presses the magnetic tape (13) against the capstan (25) for frictional traveling, and (30) is a rotating head drum.
第４図は上記回転ヘツドドラム（30）の構成を示す斜
視図である。同図において、（31）は回転ドラム、（3
2）は固定ドラム、（33）は磁気ヘツド、（34）は上記
回転ドラム（31）に設けられた窓、（35）は上記固定ド
ラム（32）に設けられたリード溝である。また、矢印
（100）は磁気ヘツド（33）の走査方向、矢印（101）は
磁気ヘツド（33）の幅方向である。FIG. 4 is a perspective view showing the structure of the rotary head drum (30). In the figure, (31) is a rotating drum, and (3
2) is a fixed drum, (33) is a magnetic head, (34) is a window provided in the rotating drum (31), and (35) is a lead groove provided in the fixed drum (32). The arrow (100) is the scanning direction of the magnetic head (33), and the arrow (101) is the width direction of the magnetic head (33).
第５図は上記磁気ヘツド（33）の構成を示す図であ
り、同図（ａ）は磁気ヘツド（33）をその幅方向（10
1）からみた平面図、同図（ｂ）は磁気ヘツド（33）を
その走査方向（100）からみた側面図である。同図にお
いて、（36）は磁気ヘツド本体（33A）に巻かれたコイ
ル、（37）はギヤツプ、（Rx）は上記ギヤツプ（37）を
含む磁気ヘツド（33）の走査方向（100）の先端形状を
示す磁気ヘツド走査方向の曲率半径、（Ry）は上記ギヤ
ツプ（37）を含む磁気ヘツド（33）の幅方向（101）の
先端形状を表わす磁気ヘツド幅方向の曲率半径である。FIG. 5 is a diagram showing the structure of the magnetic head (33). FIG. 5 (a) shows the magnetic head (33) in the width direction (10).
1) is a plan view, and FIG. 6B is a side view of the magnetic head (33) seen from the scanning direction (100). In the figure, (36) is a coil wound around the magnetic head main body (33A), (37) is a gear tap, and (R x ) is the scanning direction (100) of the magnetic head (33) including the gear head (37). The radius of curvature in the magnetic head scanning direction showing the tip shape, (R y ) is the radius of curvature in the magnetic head width direction showing the tip shape of the magnetic head (33) including the gear (37) in the width direction (101).
第６図は上記磁気ヘツド（33）の走査方向（100）も
しくは磁気ヘツド（33）の幅方向（101）での上記磁気
ヘツド（33）と磁気テープ（13）の接触状態を表わす模
式図であり、同図（ａ）は上記ギヤツプ（37）を含む磁
気ヘツド（33）の先端近傍に磁気テープ（13）が接触し
ている状態を示し、同図（ｂ）は磁気ヘツド（33）の全
体に磁気テープ（13）が均一に接触している状態を示
し、同図（ｃ）は磁気ヘツド（33）の周辺に磁気テープ
（13）が強く接触している状態を示す。FIG. 6 is a schematic diagram showing a contact state between the magnetic head (33) and the magnetic tape (13) in the scanning direction (100) of the magnetic head (33) or the width direction (101) of the magnetic head (33). FIG. 7A shows a state in which the magnetic tape 13 is in contact with the vicinity of the tip of the magnetic head 33 including the gear 37, and FIG. 9B shows the magnetic head 33. The state where the magnetic tape (13) is uniformly in contact with the whole is shown, and the figure (c) shows the state where the magnetic tape (13) is strongly in contact with the periphery of the magnetic head (33).
第７図は上記第３図で示した構成の磁気記録再生装置
による再生出力波形の模式図であり、同図（ａ）は磁気
ヘツド（33）と磁気テープ（13）との接触状態が良好な
場合の再生出力波形、同図（ｂ）は磁気ヘツド（33）と
磁気テープ（13）との接触状態が良好でない場合の再生
出力波形の一例を示す。FIG. 7 is a schematic diagram of a reproduction output waveform by the magnetic recording / reproducing apparatus having the configuration shown in FIG. 3, and FIG. 7 (a) shows a good contact state between the magnetic head (33) and the magnetic tape (13). A reproduction output waveform in such a case, and FIG. 11B shows an example of a reproduction output waveform when the contact state between the magnetic head (33) and the magnetic tape (13) is not good.
つぎに、上記構成の動作について説明する。 Next, the operation of the above configuration will be described.
カセツト（10）内にある磁気テープ（13）がローデイ
ング機構（図示せず）により、カセツト（10）から引き
出されて、第３図に示すようなテープ走行系が構成され
る。この状態で、リールモータ（図示せず）が駆動され
ることにより、磁気テープ（13）が供給側リール（11）
から各種ガイド（21），（22），（23），（24）、回転
ヘツドドラム（30）を経て、一定速度で回転するキヤプ
スタン（25）にピンチローラ（26）で押しつけられるこ
とにより摩擦走行され、巻取側リール（12）に巻き取ら
れる。The magnetic tape (13) in the cassette (10) is pulled out from the cassette (10) by a loading mechanism (not shown) to form a tape running system as shown in FIG. In this state, the reel motor (not shown) is driven to move the magnetic tape (13) to the supply reel (11).
From the various guides (21), (22), (23), (24), and the rotating head drum (30), the capstan roller (25) rotating at a constant speed is pressed by the pinch roller (26) to frictionally travel. The film is taken up by the take-up reel (12).
このとき、回転ヘツドドラム（30）上において、磁気
テープ（13）は固定ドラム（32）の表面に設けられたリ
ード溝（35）に沿つて走行され、同時に磁気ヘツド（3
3）は回転ドラム（31）の回転にともない回転され、走
行する磁気テープ（13）に当接しながら、ヘリカル走査
して磁気テープ（13）に情報信号を記録したり、磁気テ
ープ（13）から記録された情報信号を再生する。At this time, on the rotating head drum (30), the magnetic tape (13) runs along the lead groove (35) provided on the surface of the fixed drum (32), and at the same time, the magnetic head (3).
3) is rotated by the rotation of the rotating drum (31), and while helically scanning while contacting the running magnetic tape (13), an information signal is recorded on the magnetic tape (13), or from the magnetic tape (13). Reproduce the recorded information signal.
ギヤツプ（37）を含む磁気ヘツド（33）の先端形状に
より磁気テープ（13）と磁気ヘツド（33）との接触状態
は第６図（ａ）〜（ｃ）に示すように変化する。磁気テ
ープ（13）と磁気ヘツド（33）が第６図（ａ）に示すよ
うに、ギヤツプ（37）を含む磁気ヘツド（33）の先端近
傍で強く接触している場合、回転ヘツドドラム（30）へ
の磁気テープ（13）の巻付け位置により磁気テープ（1
3）と磁気ヘツド（33）との接触状態が変化しやすく、
再生出力波形も第７図（ａ）に示すように、良好な再生
出力波形が得られたり、第７図（ｂ）に示すように、良
好でない再生出力波形が得られたりする。The contact state between the magnetic tape (13) and the magnetic head (33) changes depending on the shape of the tip of the magnetic head (33) including the gear (37), as shown in FIGS. When the magnetic tape (13) and the magnetic head (33) are in strong contact with each other near the tip of the magnetic head (33) including the gear (37) as shown in FIG. 6 (a), the rotating head drum (30). Depending on the winding position of the magnetic tape (13) around the magnetic tape (1
The contact state between 3) and the magnetic head (33) tends to change,
As for the reproduction output waveform, a good reproduction output waveform is obtained as shown in FIG. 7 (a), or a bad reproduction output waveform is obtained as shown in FIG. 7 (b).
また、磁気ヘツド（33）の先端近傍のみが強く摺動さ
れるので、磁気ヘツド（33）の摩耗が磁気ヘツド先端近
傍のみで進行し、結果としてギヤツプ（37）を含む磁気
ヘツド（33）の先端形状の変化が大きくなる。このよう
にギヤツプ（37）を含む磁気ヘツド（33）の先端形状が
変化すると、磁気テープ（13）と磁気ヘツド（33）との
接触状態が変化するので、再生出力レベルおよび再生出
力波形が変化しやすい。また、磁気ヘツド（33）の回転
ドラム（31）に対する取付け姿勢が悪く、ギヤツプ（3
7）と磁気ヘツド（33）の頂点が一致していない場合、
再生出力波形は第７図（ｂ）のようになりやすい。Also, since only the vicinity of the tip of the magnetic head (33) slides strongly, wear of the magnetic head (33) progresses only near the tip of the magnetic head (33), and as a result, the magnetic head (33) including the gear head (37) The change in the tip shape becomes large. When the tip shape of the magnetic head (33) including the gear head (37) changes in this way, the contact state between the magnetic tape (13) and the magnetic head (33) changes, so the reproduction output level and reproduction output waveform change. It's easy to do. In addition, the mounting position of the magnetic head (33) with respect to the rotating drum (31) is not good, and the gear cap (3
If the vertices of 7) and the magnetic head (33) do not match,
The reproduced output waveform tends to be as shown in FIG. 7 (b).
一方、磁気テープ（13）と磁気ヘツド（33）との接触
状態が第６図（ｂ）に示すように、磁気ヘツド（33）の
全体で均一に接触している場合、磁気記録再生装置の使
用初期状態から、第７図（ａ）に示すように、良好な再
生出力波形が得られる。また、磁気ヘツド（33）と磁気
テープ（13）との摺動は磁気ヘツド（33）のほぼ全体で
おこるので、磁気ヘツド（33）の摩耗は磁気ヘツド（3
3）のほぼ全体で均一にすすみ、その結果として、摩耗
による磁気ヘツド（33）の先端形状の変化は小さい。On the other hand, when the contact state between the magnetic tape (13) and the magnetic head (33) is in uniform contact with the entire magnetic head (33), as shown in FIG. From the initial state of use, a good reproduction output waveform can be obtained as shown in FIG. In addition, since the sliding of the magnetic head (33) and the magnetic tape (13) occurs on almost the entire magnetic head (33), the wear of the magnetic head (33) causes the magnetic head (3) to wear.
As a result, the tip shape of the magnetic head (33) changes little due to wear.
すなわち、使用初期状態から磁気記録再生装置の使用
保証期間の終了まで、磁気テープ（13）と磁気ヘツド
（33）との接触状態は良好で、第７図（ａ）に示すよう
な再生出力波形が得られる。That is, the contact state between the magnetic tape (13) and the magnetic head (33) is good from the initial state of use to the end of the guaranteed use period of the magnetic recording / reproducing apparatus, and the reproduction output waveform as shown in FIG. 7 (a) is obtained. Is obtained.
さらに、磁気テープ（13）と磁気ヘツド（33）との接
触状態が第６図（ｃ）に示すように、磁気テープ（13）
と磁気ヘツド（33）の周辺で強く接触している場合、ギ
ヤツプ（37）を含む磁気ヘツド（33）の先端近傍での接
触が弱く、スペーシングロスが発生しやすくなり、第７
図（ｂ）に示すように、良好な再生出力波形が得られな
い。Further, as shown in FIG. 6 (c), the contact state between the magnetic tape (13) and the magnetic head (33) is the magnetic tape (13).
When the magnetic head (33) and the magnetic head (33) are in strong contact with each other, the contact near the tip of the magnetic head (33) including the gear (37) is weak, and spacing loss easily occurs.
As shown in FIG. 6B, a good reproduction output waveform cannot be obtained.
［発明が解決しようとする課題］ 従来の磁気記録再生装置は以上のように構成されてい
るので、使用初期状態において、再生出力波形が良好か
どうかの予測ができず、また使用初期状態で良好な再生
出力波形が得られていても、磁気ヘツドの摩耗により出
力不良となる場合があつた。[Problems to be Solved by the Invention] Since the conventional magnetic recording / reproducing apparatus is configured as described above, it is not possible to predict whether or not the reproduction output waveform is good in the initial use state, and it is good in the initial use state. Even if a good reproduction output waveform is obtained, the output may be defective due to wear of the magnetic head.
また、使用初期状態で良好な再生出力波形を得るため
に、エージングをおこなつて、強制的に磁気ヘツドを摩
耗させ磁気テープと磁気ヘツドの先端部分とがほぼ均一
に接触する磁気ヘツドの先端形状にする必要があるけれ
ども、このようにエージングをおこなうことにより磁気
ヘツドの使用可能期間が短縮されるなどの問題があつ
た。In order to obtain a good playback output waveform in the initial state of use, the tip shape of the magnetic head is such that aging is performed to forcibly wear the magnetic head and the magnetic tape and the tip of the magnetic head make almost uniform contact. However, there is a problem that the usable period of the magnetic head is shortened by performing the aging in this way.
この発明は上記のような問題点を解消するためになさ
れたもので、磁気ヘツドの先端形状の変化が小さく、か
つ磁気ヘツドの使用可能期間が長いうえに、使用初期状
態から磁気ヘツドが摩耗した後まで安定して良好な再生
出力波形を得ることができる磁気記録再生装置を提供す
ることを目的とする。The present invention has been made in order to solve the above problems, in which the change in the tip shape of the magnetic head is small, and the magnetic head has a long usable period, and the magnetic head has worn from the initial state of use. It is an object of the present invention to provide a magnetic recording / reproducing device capable of stably obtaining a good reproduction output waveform until later.
［課題を解決するための手段］ この発明に係る磁気記録再生装置は、磁気ヘツドのギ
ヤツプを含む磁気ヘツド先端近傍の形状を表わす磁気ヘ
ツド走査方向の曲率半径の値と磁気ヘツドの幅方向の曲
率半径の値とを、各曲率半径を単位mmで表した場合に、
両曲率半径の積が４から９の範囲の値から選択された値
となるように設定されていることを特徴とする。[Means for Solving the Problems] In the magnetic recording / reproducing apparatus according to the present invention, the value of the radius of curvature in the magnetic head scanning direction and the curvature in the width direction of the magnetic head, which represent the shape in the vicinity of the tip of the magnetic head including the gap of the magnetic head. When the radius value and each radius of curvature are expressed in mm,
It is characterized in that the product of both curvature radii is set to a value selected from the values in the range of 4 to 9.
［作用］ この発明によれば、磁気ヘツドのギヤツプを含む磁気
ヘツド先端部の形状が磁気テープと磁気ヘツドの接触部
分のすべてにおいて均一な接触状態となるので、磁気テ
ープと磁気ヘツドの摺動による摩耗にともなう磁気ヘツ
ド先端部の形状変化を少なくすることが可能となる。こ
れにより、使用初期状態から使用保証期間終了までの長
い期間にわたり、安定して良好な再生出力波形を得るこ
とができる。[Operation] According to the present invention, since the shape of the tip of the magnetic head including the magnetic head gear is in a uniform contact state at all the contact portions of the magnetic tape and the magnetic head, the magnetic tape and the magnetic head are slid. It is possible to reduce the change in shape of the magnetic head tip portion due to wear. This makes it possible to stably obtain a good reproduction output waveform over a long period from the initial state of use to the end of the guaranteed use period.
［発明の実施例］ 以下、この発明の一実施例を図面にもとづいて説明す
る。Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
なお、磁気記録再生装置の一般的な構成は第３図に示
す通りであり、また、回転ヘツドドラム（30）の構成お
よび磁気ヘツド（33）の構成は第４図および第５図に示
す通りであるため、これら各図は省略する。The general structure of the magnetic recording / reproducing apparatus is as shown in FIG. 3, and the structure of the rotary head drum (30) and the structure of the magnetic head (33) are as shown in FIGS. 4 and 5. Therefore, these figures are omitted.
第１図は磁気記録再生装置に搭載される磁気ヘツド
（33）のギヤツプ（37）を含むヘツド先端近傍の形状を
表わす特性図である。同図において、（Rx）はギヤツプ
（37）を含む磁気ヘツド（33）の走査方向（100）の先
端形状を表わす磁気ヘツド走査方向の曲率半径、（Ry）
はギヤツプ（37）を含む磁気ヘツド（33）の幅方向（10
1）の先端形状を表わす磁気ヘツド幅方向の曲率半径で
ある。FIG. 1 is a characteristic diagram showing the shape of the magnetic head (33) mounted on the magnetic recording / reproducing apparatus in the vicinity of the tip of the head including the gear (37). In the figure, (R x ) is the radius of curvature in the magnetic head scanning direction, which represents the tip shape of the magnetic head (33) including the gear (37) in the scanning direction (100), and (R y )
Is the width direction (10) of the magnetic head (33) including the gear (37).
It is the radius of curvature in the magnetic head width direction that represents the tip shape of 1).
（200）は磁気ヘツド走査方向の曲率半径（Rx）と磁
気ヘツド幅方向の曲率半径（Ry）の相関を表わす双曲
線、○は上記の双曲線（200）から離れた磁気ヘツド走
査方向の曲率半径（Rx）と磁気ヘツド幅方向の曲率半径
（Ry）の値を示す点、●は上記の双曲線線（200）近傍
の磁気ヘツド走査方向の曲率半径（Rx）と磁気ヘツド幅
方向の曲率半径（Ry）の値を示す点である。(200) is a hyperbola showing the correlation between the radius of curvature (R x ) in the magnetic head scanning direction and the radius of curvature (R y ) in the width direction of the magnetic head, and ○ is the curvature in the magnetic head scanning direction away from the hyperbola (200) above. radius (R x) and a point indicating the value of the magnetic head width direction of the radius of curvature (R y), ● is the radius of curvature (R x) and the magnetic head width direction of the hyperbolic line (200) near the magnetic head scanning direction Is a point indicating the value of the radius of curvature (R y ) of.
第２図は磁気ヘツド走査方向の曲率半径（Rx）と磁気
ヘツド幅方向の曲率半径（Ry）の相関を示す特性図で、
磁気ヘツド走査方向の曲率半径（Rx）と磁気ヘツド幅方
向の曲率半径（Ry）のそれぞれの値の積が４および９と
なる双曲線を破線で示してあり、Ａは上記Rx・Ry＝４お
よびRx・Ry＝９を示す２つの双曲線に囲まれる領域であ
る。FIG. 2 is a characteristic diagram showing the correlation between the radius of curvature (R x ) in the magnetic head scanning direction and the radius of curvature (R y ) in the magnetic head width direction.
The hyperbola where the product of the respective values of the radius of curvature in the magnetic head scanning direction (R x ) and the radius of curvature in the magnetic head width direction (R y ) is 4 and 9 is shown by the broken line, and A is the above R x · R y = 4 and a region surrounded by two hyperbolas indicating Rx · Ry = 9.
第１図に示す双曲線（200）は、張力制御ガイド（2
2）によつて一定に保たれた磁気テープ（13）の張力、
回転ドラム（31）に設けられた磁気ヘツド（33）の取付
け用窓（34）の大きさ、この窓（34）に取付けられた磁
気ヘツド（33）の先端が回転ドラム（31）の外周から突
出している量、磁気ヘツド（33）の幅方向（101）の厚
みが一定の場合において解折をおこなった結果として得
られたもので、第１図の●印で示したような双曲線（20
0）の近傍の値をとる磁気ヘツド走査方向の曲率半径（R
x）と磁気ヘツド幅方向の曲率半径（Ry）を選択すれ
ば、磁気テープ（13）と磁気ヘツド（33）の接触状態
は、第６図（ｂ）に示すように、磁気テープ（13）と磁
気ヘツド（33）の接触部分でほぼ均一な接触となる。The hyperbola (200) shown in FIG. 1 is a tension control guide (2
2) the tension of the magnetic tape (13), which is kept constant by
The size of the window (34) for mounting the magnetic head (33) provided on the rotary drum (31), and the tip of the magnetic head (33) mounted on this window (34) extends from the outer periphery of the rotary drum (31). This was obtained as a result of bending when the amount of protrusion and the thickness of the magnetic head (33) in the width direction (101) were constant. The hyperbola (20
The radius of curvature in the magnetic head scanning direction (R
x ) and the radius of curvature (R y ) in the width direction of the magnetic head (R y ), the contact state of the magnetic tape (13) and the magnetic head (33) will be as shown in FIG. 6 (b). ) And the magnetic head (33) have a substantially uniform contact.
また、第１図の○で示したような双曲線（200）から
大きく離れた磁気ヘツド走査方向の曲率半径Rx飯と磁気
ヘツドの幅方向の曲率半径（Ry）の値を選択した場合、
磁気テープ（13）と磁気ヘツド（33）の接触状態は、第
６図（ａ）に示すように、磁気テープ（13）と磁気ヘツ
ド（33）の先端近傍に強く接触する状態や第６図（ｃ）
に示すように、磁気テープ（13）が磁気ヘツド（33）の
周辺に強く接触する状態となる。このような接触状態の
場合、磁気ヘツド（33）は磁気テープ（13）との摺動に
よる摩耗により、磁気ヘツド（33）の先端形状が大きく
変化し、結果的に磁気ヘツド走査方向の曲率半径（Rx）
と磁気ヘツド幅方向の曲率半径（Ry）の値は、双曲線
（200）近傍の値となる。Further, when the values of the radius of curvature R x rice in the magnetic head scanning direction and the radius of curvature (R y ) in the width direction of the magnetic head, which are widely separated from the hyperbola (200) shown by ○ in FIG. 1, are selected,
As shown in FIG. 6 (a), the magnetic tape (13) and the magnetic head (33) are in contact with each other strongly near the tips of the magnetic tape (13) and the magnetic head (33), and in FIG. (C)
As shown in, the magnetic tape (13) is in a state of being in strong contact with the periphery of the magnetic head (33). In such a contact state, the magnetic head (33) is worn by sliding on the magnetic tape (13), and the tip shape of the magnetic head (33) changes significantly, resulting in a radius of curvature in the magnetic head scanning direction. (R x )
And the radius of curvature (R y ) in the width direction of the magnetic head is a value near the hyperbola (200).
なお、上記実施例では、磁気ヘツド走査方向の曲率半
径（Rx）と磁気ヘツド幅方向の曲率半径（Ry）を除く諸
量の値を、ある一定値として双曲線（200）を得たけれ
ども、例えば、磁気テープ（13）の張力などが異なる値
の場合においても、同様に磁気ヘツド走査方向の曲率半
径（Rx）と磁気ヘツド幅方向の曲率半径（Ry）による双
曲線（200）を得て、この双曲線（200）の近傍の値をと
るように、磁気ヘツド走査方向の曲率半径（Rx）と磁気
ヘツド幅方向の曲率半径（Ry）の値を設定すれば、同様
の効果を奏する。In the above embodiment, the value of the quantities except for the magnetic head scanning direction of the radius of curvature (R x) and the magnetic head width direction of the radius of curvature (R y), but give the hyperbolic (200) as a certain value , for example, in the case of a tension different values of the magnetic tape (13) also, similarly magnetic head scanning direction of the radius of curvature (R x) and the magnetic head width direction of the radius of curvature (R y) by hyperbolic (200) Then, if the values of the radius of curvature (R x ) in the magnetic head scanning direction and the radius of curvature (R y ) in the magnetic head width direction are set so as to take values near this hyperbola (200), the same effect will be obtained. Play.
つまり、上述のように、磁気ヘツド走査方向の曲率半
径（Rx）と磁気ヘツド幅方向の曲率半径（Ry）を除く諸
量の値を変化させて得られる磁気ヘツド走査方向の曲率
半径（Rx）と磁気ヘツド幅方向の曲率半径（Ry）の相関
による双曲線の集合領域は第２図のＡとなる。That is, as described above, the radius of curvature in the magnetic head scanning direction (R x ) and the radius of curvature in the magnetic head scanning direction (R x ) and the radius of curvature in the magnetic head scanning direction obtained by changing the values of various quantities except the radius of curvature (R y ) in the width direction of the magnetic head. The collection area of the hyperbola resulting from the correlation between R x ) and the radius of curvature (R y ) in the magnetic head width direction is A in FIG.
すなわち、第２図に示す領域Ａ内の磁気ヘツド走査方
向の曲率半径（Rx）と磁気ヘツド幅方向の曲率半径
（Ry）の値を選択すれば、磁気記録再生装置の使用初期
状態から使用保証期間終了まで磁気ヘツド（33）と磁気
テープ（13）との接触状態を第６図（ｂ）に示すように
維持することが可能である。That is, by selecting a value of the second radius of curvature (R x) of the magnetic head scanning direction in a region A shown in FIG magnetic head width direction of the radius of curvature (R y), from the initial use state of the magnetic recording and reproducing apparatus The contact state between the magnetic head (33) and the magnetic tape (13) can be maintained as shown in FIG. 6 (b) until the end of the guaranteed use period.
［発明の効果］ 以上のように、この発明によれば、ギヤツプを含む磁
気ヘツドの先端部形状を、磁気テープが磁気ヘツドの接
触部分でほぼ均一に接触するように構成したので、磁気
テープと磁気ヘツドとの摺動による摩耗にともなう磁気
ヘツドの先端部形状の変化を少なくすることができ、使
用初期状態から使用保証期間終了までの長い期間にわた
り、良好な再生出力波形を得ることができる。また、エ
ージングなどの工程を省略することができ、磁気ヘツド
の寿命を長くすることができる。[Effects of the Invention] As described above, according to the present invention, the shape of the tip of the magnetic head including the gear is configured so that the magnetic tape contacts the contact portion of the magnetic head substantially uniformly. It is possible to reduce the change in the shape of the tip of the magnetic head due to the abrasion due to sliding with the magnetic head, and it is possible to obtain a good reproduction output waveform over a long period from the initial state of use to the end of the guaranteed period of use. Further, steps such as aging can be omitted, and the life of the magnetic head can be extended.
第１図はこの発明の一実施例による磁気記録再生装置に
搭載される磁気ヘツドのギヤツプを含む先端近傍の形状
を表わす磁気ヘツド走査方向の曲率半径と磁気ヘツド幅
方向の曲率半径の値の相関を示す特性図、第２図は磁気
ヘツド走査方向の曲率半径と磁気ヘツド幅方向の曲率半
径の値の組合せの範囲を示す特性図、第３図は磁気記録
再生装置の一般的な構成を示す平面図、第４図は回転ヘ
ツドドラムの構成を示す斜視図、第５図は磁気ヘツドの
構成を示す図、第６図は磁気テープと磁気ヘツドの接触
状態を示す模式図、第７図は磁気記録再生装置により得
られる再生出力波形を示す模式図である。 （13）……磁気テープ、（30）……回転ヘツドドラム、
（31）……回転ドラム、（32）……固定ドラム、（33）
……磁気ヘツド、（34）……窓、（35）……リード溝、
（37）……ギヤツプ、（Rx）……磁気ヘツド走査方向の
曲率半径、（Ry）……磁気ヘツド幅方向の曲率半径、
（200）……磁気ヘツド走査方向の曲率半径（Rx）と磁
気ヘツド幅方向の曲率半径（Ry）の組合せを表わす双曲
線。 なお、図中の同一符号は同一または相当部分を示す。FIG. 1 shows the correlation between the radius of curvature in the magnetic head scanning direction and the value of the radius of curvature in the magnetic head width direction, which represents the shape in the vicinity of the tip of the magnetic head mounted on a magnetic recording / reproducing apparatus according to an embodiment of the present invention, including the tip. FIG. 2 is a characteristic diagram showing a range of combinations of values of a radius of curvature in the magnetic head scanning direction and a radius of curvature in the magnetic head width direction, and FIG. 3 is a general configuration of a magnetic recording / reproducing apparatus. FIG. 4 is a plan view, FIG. 4 is a perspective view showing the structure of a rotary head drum, FIG. 5 is a view showing the structure of a magnetic head, FIG. 6 is a schematic view showing the contact state of a magnetic tape and a magnetic head, and FIG. It is a schematic diagram which shows the reproduction | regeneration output waveform obtained by a recording / reproducing apparatus. (13) …… Magnetic tape, (30) …… Rotary head drum,
(31) …… Rotating drum, (32) …… Fixed drum, (33)
...... Magnetic head, (34) …… Window, (35) …… Lead groove,
(37) …… Gearup, (R x ) …… Magnetic head scanning radius of curvature, (R y ) …… Magnetic head width direction radius of curvature,
(200) ... A hyperbola that represents the combination of the radius of curvature (R x ) in the magnetic head scanning direction and the radius of curvature (R y ) in the magnetic head width direction. The same reference numerals in the drawings indicate the same or corresponding parts.
Claims (1)
周面に有する固定ドラムと、この固定ドラムに回転可能
に支持された回転ドラムと、この回転ドラムの外周面に
開口して形成された窓から外部に突出して上記磁気テー
プに情報を記録し再生するように上記回転ドラムに支持
された磁気ヘッドとを備えた回転ヘッドドラムを有する
磁気記録再生装置において、上記磁気ヘッドのギャップ
を含む磁気ヘッド先端近傍の形状を表わす磁気ヘッドの
走査方向の曲率半径と磁気ヘッドの幅方向の曲率半径の
値について、各曲率半径を単位mmで表した場合に、両曲
率半径の積が４から９の範囲の値から選択された値とな
るように設定されていることを特徴とする磁気記録再生
装置。1. A fixed drum having a lead groove on the outer peripheral surface for guiding the running of a magnetic tape, a rotary drum rotatably supported by the fixed drum, and an opening formed on the outer peripheral surface of the rotary drum. A magnetic recording / reproducing apparatus having a rotary head drum provided with a magnetic head supported on the rotary drum so as to record information on the magnetic tape and reproduce the information by projecting to the outside from a window. Regarding the values of the radius of curvature in the scanning direction of the magnetic head and the radius of curvature in the width direction of the magnetic head that represent the shape in the vicinity of the tip of the head, the product of both radiuses of curvature is 4 to 9 A magnetic recording / reproducing apparatus, wherein the magnetic recording / reproducing apparatus is set to a value selected from a range of values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21351389A JP2677680B2 (en) | 1989-08-18 | 1989-08-18 | Magnetic recording / reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21351389A JP2677680B2 (en) | 1989-08-18 | 1989-08-18 | Magnetic recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0378108A JPH0378108A (en) | 1991-04-03 |
| JP2677680B2 true JP2677680B2 (en) | 1997-11-17 |
Family
ID=16640436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21351389A Expired - Fee Related JP2677680B2 (en) | 1989-08-18 | 1989-08-18 | Magnetic recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2677680B2 (en) |
-
1989
- 1989-08-18 JP JP21351389A patent/JP2677680B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0378108A (en) | 1991-04-03 |
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