JPH073448Y2 - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH073448Y2 JPH073448Y2 JP1987024401U JP2440187U JPH073448Y2 JP H073448 Y2 JPH073448 Y2 JP H073448Y2 JP 1987024401 U JP1987024401 U JP 1987024401U JP 2440187 U JP2440187 U JP 2440187U JP H073448 Y2 JPH073448 Y2 JP H073448Y2
- Authority
- JP
- Japan
- Prior art keywords
- head
- recording
- erasing
- reproducing
- gap
- 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 - Lifetime
Links
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Description
【考案の詳細な説明】 (イ)産業上の利用分野 本考案は、磁気デイスク用の記録装置に用いられる磁気
ヘツドに関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to a magnetic head used in a recording device for a magnetic disk.
(ロ)従来の技術 磁気デイスクの小型化、高密度記録化に伴い、記録装置
に用いられる磁気ヘツドとして、隣接するトラツクから
のクロストークを防止し、高密度記録を可能にした磁気
ヘツドが種々提案されている。例えば、特開昭57-44219
号公報に詳しい。(B) Conventional technology With the miniaturization and high density recording of magnetic disks, various magnetic heads used in recording devices have been developed to prevent crosstalk from adjacent tracks and enable high density recording. Proposed. For example, JP-A-57-44219
Details in the bulletin.
この磁気ヘツドは第6図および第7図に示すように、磁
気ヘツド(1)は2つのヘツドすなわち、記録再生用ヘ
ツド(2)と消去用ヘツド(3)とから成つている。記
録再生用ヘツド(2)は、第1のコア(4)と第2のコ
ア(5)とが、これらの間に所定の記録再生用ギヤツプ
(6)が形成されるように、互いに接合されて構成され
ている。そして、これら第1のコア(4)と第2のコア
(5)との間には所定の巻線溝(7)が形成されてい
る。記録再生用ギヤツプ(6)の長さは1は、この記
録再生用ヘツド(2)の両側面に設けられた一対の溝部
(8)(9)に依り規定されている。一方、消去用ヘツ
ド(3)は、第3のコア(10)と第4のコア(11)とが
互いに接合されて構成されているが、その際、図示の如
く、これらの間の接合面の中央部に設けられた穴部(1
2)に依つて互いに分割された一対の消去用ギヤツプ(1
3)(14)が夫々形成されるようになつている。そし
て、この消去用ヘツド(3)の両側面にも一対の溝部
(15)(16)が夫々設けられ、上記各消去用ギヤツプ
(13)(14)の長さl2は、これらの溝部(15)(16)と
上記穴部(12)とに依り規定されている。又、これら第
3のコア(10)と第4のコア(11)との間には、前述し
たと同様、所定の巻線溝(17)が形成されている。記録
再生用ヘツド(2)と消去用ヘツド(3)とは、第2の
コア(5)と第3のコア(10)との間で互いに接合さ
れ、これに依つて、第1のコア(4)、第2のコア
(5)、第3のコア(10)及び第4のコア(11)が直列
に配列されるようになつている。更にデイスクに対接す
る面は研磨されると共に、巻線溝(7)(17)に巻線
(62)(63)を所定の巻回数で巻回している。また、記
録再生用ギヤツプ(6)と一対の消去用ギヤツプ(13)
(14)とは互いに平行に配され、上記記録再生用ギヤツ
プ(6)に依つて形成される記録トラツクの両側縁部近
傍を上記一対の消去用ギヤツプ(13)(14)が走査する
ようになされている。即ち、両消去用ギヤツプ(13)
(14)間の間隔l3は記録再生用ギヤツプ(6)の長さ
1に等しいか或いは若干小さくなされており、この消去
用ギヤツプ(13)(14)間の間隔l3が実質的な記録トラ
ツク巾となる。As shown in FIGS. 6 and 7, the magnetic head (1) comprises two heads, that is, a recording / reproducing head (2) and an erasing head (3). The recording / reproducing head (2) is joined to each other such that the first core (4) and the second core (5) form a predetermined recording / reproducing gear (6) therebetween. Is configured. A predetermined winding groove (7) is formed between the first core (4) and the second core (5). The length 1 of the recording / reproducing gear (6) is defined by a pair of groove portions (8) and (9) provided on both side surfaces of the recording / reproducing head (2). On the other hand, the erasing head (3) is formed by joining the third core (10) and the fourth core (11) to each other. The hole (1
2) A pair of erasing gears (1
3) (14) are formed respectively. A pair of grooves (15) (16) are also provided on both side surfaces of the erasing head (3), and the length l2 of each of the erasing gears (13) (14) is defined by these grooves (15). ) (16) and the hole (12) above. A predetermined winding groove (17) is formed between the third core (10) and the fourth core (11) as described above. The recording / reproducing head (2) and the erasing head (3) are bonded to each other between the second core (5) and the third core (10), whereby the first core ( 4), the second core (5), the third core (10) and the fourth core (11) are arranged in series. Further, the surface facing the disk is polished, and the windings (62) and (63) are wound around the winding grooves (7) and (17) a predetermined number of times. Also, a recording / reproducing gear (6) and a pair of erasing gears (13)
(14) are arranged in parallel with each other, and the pair of erasing gears (13) (14) scan the vicinity of both side edges of the recording track formed by the recording / reproducing gear (6). Has been done. That is, both erasing gears (13)
The distance l3 between (14) is equal to or slightly smaller than the length 1 of the recording / reproducing gear (6). Becomes
従つて、前記磁気ヘツド(1)を用いると、記録トラツ
クの両側にほぼ完全な無信号状態のガードバンドになる
ので、記録密度を高めるためにトラツク間隔を狭めて
も、再生時に隣接するトラツクからクロストークを生じ
ることがなくなり、100トラツク/インチ以上の高トラ
ツク密度にも比較的容易に対応することができる。Therefore, when the magnetic head (1) is used, a guard band with almost no signal is formed on both sides of the recording track. Therefore, even if the track interval is narrowed in order to increase the recording density, the adjacent track is not reproduced. Crosstalk will not occur and high track densities of 100 tracks / inch or more can be handled relatively easily.
ところで、磁気デイスク装置の大容量化に伴いトラツク
ピツチが狭くなり、ガードバンドをオフトラツク量が越
える可能性がでており、従来行なわれてきたオープンル
ープによる磁気ヘツドの位置決めではオフトラツク量を
制御できずフイードバツク制御による磁気ヘツドの位置
制御の導入が必要となつてきている。By the way, as the capacity of the magnetic disk device increases, the track pitch becomes narrower, and the off-track amount may exceed the guard band.Therefore, the off-track amount cannot be controlled by the conventional open-loop positioning of the magnetic head, and the feed back amount cannot be controlled. It is becoming necessary to introduce magnetic head position control by control.
フイードバツク制御による、磁気ヘツドの位置決めはフ
ロツピーデイスクでは、固定デイスクの様にサーボ面が
持てず、データ面によるデータ面サーボとする必要があ
る。データ面サーボ行なう時のオフトラツク量を検出す
る方式としては、記録再生用ヘツドによる再生出力のエ
ンベロープの出力差をオフトラツク量として検出する方
式(例えば、特開昭61-265783号公報に詳しい。)やあ
らかじめ各セレクタ間に位置誤差信号を書いておくセク
タサーボ方式などがある。In the floppy disk, positioning of the magnetic head by feed back control does not have a servo surface like a fixed disk, and it is necessary to use a data surface servo based on the data surface. As a method of detecting the off-track amount when performing the data surface servo, a method of detecting the output difference of the envelope of the reproduction output by the recording / reproducing head as the off-track amount (for example, see JP-A-61-265783). There is a sector servo system in which a position error signal is written in advance between each selector.
(ハ)考案が解決しようとする問題点 しかしながら、上述したエンベロープ検出方式において
は、オフトラツクの方向決定ができず常にヘツドを振動
させる必要があり、またあらかじめ磁気デイスクの位置
誤差信号を記録しておく必要があるため、使用者側で
は、フオーマツト動作ができないなどの問題があつた。(C) Problems to be solved by the device However, in the envelope detection method described above, the head cannot always be determined in the off-track direction, and the head must be vibrated at all times, and the position error signal of the magnetic disk is recorded in advance. Since it is necessary, the user has a problem that the format operation cannot be performed.
(ニ)問題点を解決するための手段 本考案は、消去用ギヤツプのギヤツプ長を記録再生用ギ
ヤツプのギヤツプ長と同程度のギヤツプ長に設定し、且
つ消去用ヘツドコアの飽和磁束密度を記録再生用ヘツド
コアより大きいコア材を用いると共に、複数の消去用ヘ
ツドコアに夫々独立して巻線を施し、この消去用ギヤツ
プより検出した磁気ヘツド位置誤差信号と、記録再生用
ギヤツプから検出した信号とを比較して磁気ヘツド位置
制御を行なう磁気ヘツドである。(D) Means for solving the problems In the present invention, the gear length of the erasing gear is set to the same length as that of the recording / reproducing gear, and the saturation magnetic flux density of the erasing head core is recorded / reproducing. In addition to using a core material that is larger than the erasing head core, multiple erasing head cores are independently wound, and the magnetic head position error signal detected by this erasing gear is compared with the signal detected by the recording / reproducing gear. A magnetic head for controlling the magnetic head position.
(ホ)作用 本発明では、複数の消去用ヘツドを検出器として用いる
ため、記録再生ヘツドで検出するときに対し、容易に誤
差方向がわかり、速やかな位置決め制御が行なえる。ま
た消去用ヘツドコアのギヤツプ部に記録再生用ヘツドコ
アの飽和磁束密度よりも高い材料を用いているため、記
録再生用ヘツドにより書込データよりも強い書込みがで
き、消去特性を劣化させることもない。(E) Function In the present invention, since a plurality of erasing heads are used as detectors, the error direction can be easily known and quick positioning control can be performed, compared to when the recording / reproducing head is used for detection. Further, since a material having a higher saturation magnetic flux density than that of the recording / reproducing head core is used for the gear head portion of the erasing head core, the recording / reproducing head can perform writing stronger than the write data without deteriorating the erasing characteristics.
(ヘ)実施例 本考案の実施例を第1図ないし第5図に従い説明する。(F) Embodiment An embodiment of the present invention will be described with reference to FIGS.
(20)は飽和磁束密度4,000GのMn-Znフエライト多結晶
のコア材からなる記録再生用ヘツド、(21)はトラツク
幅125μm、ギヤツプ長0.9μmの記録再生用ギヤツプで
ある。(20) is a recording / reproducing head made of a core material of Mn-Zn ferrite polycrystal having a saturation magnetic flux density of 4,000 G, and (21) is a recording / reproducing gear having a track width of 125 μm and a gear length of 0.9 μm.
(30)(31)は飽和磁束密度7,800Gのセンダスト合金を
主体としたコア材からなる消去用ヘツド(32)(33)は
消去用ギヤツプで、トラツク幅60μm、ギヤツプ長0.9
μmである。(30) and (31) are erasing heads composed of a core material mainly composed of Sendust alloy with a saturation magnetic flux density of 7,800 G. (32) (33) are erasing gears with a track width of 60 μm and a gear length of 0.9.
μm.
(40)は記録再生用ヘツド(20)および消去用ヘツド
(30)(31)を保持するスライダで、チタン酸カルシウ
ム、チタン酸バリウム等のセラミツクにて形成される。
このスライダ(40)で各ヘツド(20)(30)(31)を保
持すると、記録再生用ギヤツプ(21)の両側に消去用ギ
ヤツプ(32)(33)が互いに平行状態で保持される。Reference numeral (40) is a slider for holding the recording / reproducing head (20) and the erasing head (30) (31), which is formed by a ceramic such as calcium titanate or barium titanate.
When the heads (20) (30) (31) are held by the slider (40), the erasing gears (32) (33) are held in parallel with each other on both sides of the recording / reproducing gear (21).
(22)は記録再生用ヘツド(20)に装着される記録再生
用ヘツドコイル、(34)(35)は消去用ヘッド(30)
(31)に夫々装着される消去用ヘツドコイルである。こ
の消去用ヘツドコイル(34)(35)は夫々独立して設け
られている。(23)(36)(37)は夫々ヘツド(20)
(30)(31)に接着されるバツクコアである。(22) is a recording / reproducing head coil mounted on the recording / reproducing head (20), and (34) and (35) are erasing heads (30).
An erasing head coil attached to each of (31). The erasing head coils (34) (35) are independently provided. (23) (36) (37) are head (20)
It is a back core that is adhered to (30) and (31).
第3図は、本発明の磁気ヘツドを用いたときのトラツク
と各ギヤツプとの位置関係を示し、図中(A)はガード
バンド、(O)はオフトラツク量である。このときガー
ドバンド(A)は60μm、オフトラツク量(O)40μm
である。FIG. 3 shows the positional relationship between the track and each gear when the magnetic head of the present invention is used. In the figure, (A) is the guard band and (O) is the off-track amount. At this time, the guard band (A) is 60 μm and the off-track amount (O) is 40 μm.
Is.
第3図のように、消去用ギヤツプ(32)(33)は、一方
(33)が記録再生用ギヤツプ(21)と同じトラツク
(T1)上に、他方(32)が隣のトラツク(T2)上になる
が、両消去用ギヤツプからの信号と記録再生用ギヤツプ
からの信号を比較すると誤差方向を判別することができ
る。As shown in FIG. 3, one of the erasing gears (32) and (33) is on the same track (T 1 ) as the recording and reproducing gear (21), and the other (32) is the adjacent track (T). 2 ) As mentioned above, it is possible to determine the error direction by comparing the signals from the erasing gears and the recording / reproducing gears.
第4図は、第3図の状態に磁気ヘツドがある時の記録再
生用ヘツド(20)と消去用ヘツド(30)(31)の再生出
力特性である。尚、再生出力は、記録再生用ヘツドの線
密度100Kのときの出力との相対値を示す。第3図より、
低域出力の1/2の出力になるD50値はほぼ同一であり、特
性的には、出力レベルのみが異なつていることがわか
る。FIG. 4 shows the reproduction output characteristics of the recording / reproducing head (20) and the erasing head (30) (31) when there is a magnetic head in the state of FIG. The reproduction output indicates a relative value to the output when the recording / reproducing head has a linear density of 100K. From Figure 3,
The D50 value that is half the output of the low frequency output is almost the same, and it can be seen that only the output level is characteristically different.
このため、記録再生用ヘツドと消去用ヘツドの再生出力
の比較は回路ゲインのみを調節すれば可能である。For this reason, the reproduction output of the recording / reproducing head and the erasing head can be compared by adjusting only the circuit gain.
第5図は、本考案の消去ヘツド(30)(31)の消去特性
を、飽和磁束密度4000GのMn-Znフエライトギヤツプ長2.
5μm幅60μmの消去ヘツドによる消去特性とを比較し
たものである。測定は最初200KHzの矩形波を書き込んだ
あと磁気ヘツドを第3図のように移動した後に点線は消
去ヘツドを作動させないとき、実線は消去ヘツドを作動
させ、250KHzの矩形波を書込み、再度磁気ヘツドを元の
位置に戻し再生出力をスペクトラムアナライザに入力し
たものである。第5図(イ)のように本考案ヘツド
(A)の消去特性は第5図(ロ)に示す従来構造形の消
去ヘツド(B)に対し同等の消去能力を持つていること
がわかる。Fig. 5 shows the erasing characteristics of the erasing heads (30) and (31) of the present invention, with a saturation magnetic flux density of 4000 G and a Mn-Zn ferrite gear length of 2.
This is a comparison between the erase characteristics of an erase head having a width of 5 μm and 60 μm. The measurement is to write a rectangular wave of 200 KHz first, and then move the magnetic head as shown in Fig. 3. When the dotted line does not activate the erase head, the solid line activates the erase head, writes a rectangular wave of 250 KHz, and writes the magnetic head again. Is returned to the original position and the reproduction output is input to the spectrum analyzer. As shown in FIG. 5 (a), the erase characteristic of the head (A) of the present invention is equivalent to that of the conventional structure type erase head (B) shown in FIG. 5 (b).
(ト)考案の効果 以上説明したように、本考案の磁気ヘツドによれば、誤
差信号検出を消去用ヘツドで兼用できるため、特別な再
生ヘツドを必要とせず構造が簡単にして、連やかな位置
制御が行なえる。(G) Effect of the Invention As described above, according to the magnetic head of the present invention, the error signal can be detected by the erasing head, so that a special reproducing head is not necessary and the structure is simple and continuous. Position control is possible.
第1図は本考案の一実施例を示す斜視図、第2図は同要
部を示す平面図、第3図は磁気ヘツドの各ギヤツプと磁
気デイスクとの位置関係を示す平面図、第4図は本考案
の磁気ヘツドの出力特性を示す特性図、第5図は本考案
の磁気ヘツドと従来の磁気ヘツドとの出力特性図で、第
5図(イ)は本考案の特性、第5図(ロ)は従来の特性
を夫々示す。 第6図は従来の磁気ヘツドを示す斜視図、第7図はヘツ
ド摺接面を示す平面図である。 (2)、(20)……記録再生用ヘツド、(3)、(3
0)、(31)……消去用ヘツド、(21)……記録再生用
ギヤツプ、(32)(33)……消去用ギヤツプ、(22)…
…記録再生用ヘツドコイル、(34)、(35)……消去用
ヘツドコイル。FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a plan view showing the main part of the present invention, FIG. 3 is a plan view showing the positional relationship between each of the magnetic head gears and the magnetic disk, and FIG. FIG. 5 is a characteristic diagram showing the output characteristic of the magnetic head of the present invention, FIG. 5 is an output characteristic diagram of the magnetic head of the present invention and the conventional magnetic head, and FIG. 5 (a) is the characteristic of the present invention, The figure (b) shows the conventional characteristics, respectively. FIG. 6 is a perspective view showing a conventional magnetic head, and FIG. 7 is a plan view showing a head sliding contact surface. (2), (20) ... Head for recording / reproduction, (3), (3
0), (31) ... Erasing head, (21) ... Recording / reproducing gear, (32) (33) ... Erasing gear, (22) ...
… Head coil for recording / reproducing, (34), (35) …… Head coil for erasing.
Claims (1)
用ヘッドと記録再生用ギャップの両側部に位置する箇所
に消去用ギャップが形成された消去用ヘッドとを、両ギ
ャップ間に所定の間隔を有して両ヘッドを配置してなる
磁気ヘッドであって、前記消去用ギャップのギャップ長
を前記記録再生用ギャップのギャップ長と同程度の長さ
に設定し、且つ、前記消去用ヘッドの少なくともギャッ
プ部を、記録再生用ヘッドのコア材よりも飽和磁束密度
が大きいコア材で構成すると共に、前記消去用ヘッドの
コアに夫々独立して巻線を施し、前記消去用ギャップに
て検出した磁気ヘッド位置誤差信号と記録再生用ギャッ
プから検出した信号とを比較して、磁気ヘッド位置制御
を行なう磁気ヘッド。1. A recording / reproducing head having a recording / reproducing gap formed therein and an erasing head having erasing gaps formed at both sides of the recording / reproducing gap are arranged at predetermined intervals between the gaps. A magnetic head in which both heads are arranged with a gap, the gap length of the erasing gap is set to be approximately the same as the gap length of the recording / reproducing gap, and At least the gap portion is composed of a core material having a saturation magnetic flux density higher than that of the recording / reproducing head core, and the core of the erasing head is independently wound, and the gap is detected by the erasing gap. A magnetic head that performs magnetic head position control by comparing a magnetic head position error signal with a signal detected from a recording / reproducing gap.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987024401U JPH073448Y2 (en) | 1987-02-20 | 1987-02-20 | Magnetic head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987024401U JPH073448Y2 (en) | 1987-02-20 | 1987-02-20 | Magnetic head |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63130908U JPS63130908U (en) | 1988-08-26 |
JPH073448Y2 true JPH073448Y2 (en) | 1995-01-30 |
Family
ID=30823595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1987024401U Expired - Lifetime JPH073448Y2 (en) | 1987-02-20 | 1987-02-20 | Magnetic head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH073448Y2 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59201212A (en) * | 1983-04-28 | 1984-11-14 | Toshiba Corp | Magnetic head |
JPS6028021A (en) * | 1983-07-26 | 1985-02-13 | Hitachi Maxell Ltd | Magnetic head for floppy disk |
-
1987
- 1987-02-20 JP JP1987024401U patent/JPH073448Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS63130908U (en) | 1988-08-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5229895A (en) | Multi-track servo recording head assembly | |
JP2635550B2 (en) | Magnetic recording / reproducing device | |
EP0517531B1 (en) | Multi-track servo recording system | |
JPH0221044B2 (en) | ||
EP0105502A1 (en) | Perpendicular magnetic recording method | |
JPS5835769A (en) | Magnetic disc device | |
US4939608A (en) | Low-noise magnetic read/write head | |
JPH073448Y2 (en) | Magnetic head | |
JP2570435B2 (en) | Magnetic disk drive | |
JP2655871B2 (en) | Composite magnetic head | |
JPH03119507A (en) | Magnetic head | |
JP2502017B2 (en) | Magnetic disk drive | |
JP2778224B2 (en) | Magnetic head | |
JPS6331852B2 (en) | ||
JPH0753124Y2 (en) | Tracking control device for magnetic disk device | |
JP2911165B2 (en) | Magnetic head | |
JPH079204Y2 (en) | Magnetic head | |
JPH0237125Y2 (en) | ||
JPH0125124B2 (en) | ||
JPS62226406A (en) | Magnetic head | |
JPH02134718A (en) | Magnetic head slider assembly | |
JPS6231011A (en) | Magnetic head | |
JPH02172006A (en) | Magnetic head | |
JPH0536018A (en) | Magnetic head and manufacture of the same | |
JPH01158608A (en) | Floating-type magnetic head |