JPS6061914A - Thin film magnetic head for varied servocontrol system - Google Patents

Thin film magnetic head for varied servocontrol system

Info

Publication number
JPS6061914A
JPS6061914A JP17075583A JP17075583A JPS6061914A JP S6061914 A JPS6061914 A JP S6061914A JP 17075583 A JP17075583 A JP 17075583A JP 17075583 A JP17075583 A JP 17075583A JP S6061914 A JPS6061914 A JP S6061914A
Authority
JP
Japan
Prior art keywords
thermal expansion
aluminum alloy
thin film
magnetic head
servo
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
JP17075583A
Other languages
Japanese (ja)
Inventor
Hideo Tanaka
英男 田中
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP17075583A priority Critical patent/JPS6061914A/en
Publication of JPS6061914A publication Critical patent/JPS6061914A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3103—Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

PURPOSE:To make thermal off track extremely small by using an aluminum alloy having a specific coefft. of thermal expansion for a material of a slider of a thin film magnetic head for a magnetic disc device except for the rail part thereof. CONSTITUTION:A thin film magnetic head slider consists of rails 4, 5 composed of an AlTiC material and an aluminum alloy 6. A material having the value extremely approximate to the coefft. of thermal expansion of the aluminum alloy used for the base plate of a magnetic disc or the same material as the material of the base plate. The coefft. of thermal expansion of the alloy 6 is satisfactory if the value is within + or -30% of the coefft. of thermal expansion of the aluminum alloy used for the magnetic disc. The change in the position of a transducer for data and a transducer for servocontrol owing to the thermal expansion thereof is made roughly the same as the change in the track position of the magnetic disc owing to the thermal expansion thereof, by which the thermal off track is lessened considerably.

Description

【発明の詳細な説明】 本発明は磁気ディスク装置の薄膜磁気ヘッドに関するも
のである。。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin film magnetic head for a magnetic disk device. .

従来、磁気ディスク装置はサーボ面サーボ方式が主流と
なっているが、このサーボ面サーボ方式においてはサー
ボディスクとデータディスクが別のディスク板上に配置
されている為に周囲の温度の相違により位置決め精度に
誤差を生じる恐れがあった。１％にこのサーボ面サーボ
方式では高トラツク密度になるに従らて、磁気ヘッドの
位置決め誤差は増大し、高トラツク密度化が困難で高記
録密度を実現することが難しい等の欠点を有していた。Conventionally, the servo surface servo method has been the mainstream for magnetic disk drives, but in this servo surface servo method, the servo disk and data disk are placed on separate disk plates, so positioning may be difficult due to differences in ambient temperature. There was a risk of errors in accuracy. This servo surface servo system has disadvantages such as the positioning error of the magnetic head increases as the track density increases, making it difficult to increase the track density and making it difficult to achieve high recording density. was.

最近の磁気ディスク装置ではヘッド位置決め精度を上げ
るためにデータ面サーボ方式が種々検討されているが、
特にデータ面サーボ方式として、データ面の一部分を使
用するセクターサーボ方式、データ情報そのものを使用
する方式および磁気２重層ディスクを用い、下層磁性膜
をサーボ情報媒体とし、その情報を使用する方式等が検
討されている。In recent magnetic disk drives, various data surface servo systems are being considered to improve head positioning accuracy.
In particular, data surface servo methods include a sector servo method that uses part of the data surface, a method that uses the data information itself, and a method that uses a magnetic double layer disk with the lower magnetic film as the servo information medium and uses that information. It is being considered.

前記セクターサーボ方式は１トラツクをセクターに分け
て、部分的にサーボ情報を挿入する方式であるが、サー
ボ情報が入力される部分以外はトラック・サーボが出来
々い欠点を持っていた。従って高トラツク密度において
は位置決め精度が不十分である。更にデータ情報そのも
のをサーボ情報として使用するサーボ方式はデータ情報
自身を使用するために、データ情報の出力エンベロープ
が変動するとそれに伴って位置決め誤差を生じる欠点を
有している。The sector servo method divides one track into sectors and partially inserts servo information, but it has the drawback that track servo is not possible in areas other than the areas where servo information is input. Therefore, the positioning accuracy is insufficient at high track densities. Furthermore, the servo method that uses data information itself as servo information has the disadvantage that a fluctuation in the output envelope of data information causes a positioning error because the data information itself is used.

更に又２層の磁性膜を使用するサーボ方式は、上層をデ
ータ情報に使用し、下層をサーボ情報に使用するもので
、１つのデータへ、ドによりデータ及びサーボ情報を同
時に検出し、分離して使用する為位置決め誤差が小さい
。しかしこの磁気２重層媒体を用いたサーボ方式におい
ては、１つのデータヘッドによシ、データ情報及びサー
ボ情報を同時に検出する場合、再生時におけるデータ情
報とサーボ情報の分離はフィルターによυ簡単に行なわ
れるが、記録時には、サーボ情報を検出するために記録
回路にフィルターやバイアス回路が必要となり、かなり
複雑な回路構成となシ、サーボ情報の鏑を劣化させるば
がシでなく、回路系のコストも高くなる欠点を有してい
る。これを解決するためにベリードサーボ方式用薄膜磁
気ヘッドとして同一スライダーの２つのレール上の一方
にデータ用トランスデユーサ、もう一方のレールにサー
ボ用トランスデユーサを配置し、データ用と丈−ボ用ト
ランスデー−サを分離し、記録時の８４の劣化を防止す
る方法がある。しかしその場合、従来のスライダー材料
としてはアルミナ・チタン・カーバイト（略称　ＡｌＴ
ｉ０）を用い、磁気ディスク基板としてはアルミニウム
合金を用いている。そこで磁気ヘッドの位置決め精度を
さらに高精度にしようとすると、この材質の熱膨張の差
（スライＩ’−−材（ＡＩ　Ｔ　ｉｏ　）ノ熱膨張係数
７．８Ｘ１０−’／℃、通常磁気ディスクに用いられる
アルミニウム合金（Ａｔ　：９４％、Ｏｕ：０．１％、
Ｓｉ：０．４％、Ｆｅ：０．４％、Ｍｎ　：　０．１〜
０．３　％、Ｍｇ　：　３．８〜４．８％。Furthermore, in the servo system that uses two layers of magnetic films, the upper layer is used for data information and the lower layer is used for servo information, and data and servo information are simultaneously detected and separated into one data. The positioning error is small because it is used with However, in the servo system using this magnetic double layer medium, when data information and servo information are simultaneously detected by one data head, separation of data information and servo information during playback is easily performed using a filter. However, when recording, a filter and a bias circuit are required in the recording circuit to detect the servo information, resulting in a fairly complex circuit configuration. It also has the disadvantage of increasing costs. To solve this problem, as a thin-film magnetic head for buried servo method, we placed a data transducer on one of the two rails of the same slider and a servo transducer on the other rail, one for data and one for length. There is a method of separating the transducer and preventing deterioration of the 84 during recording. However, in that case, the conventional slider material is alumina titanium carbide (abbreviated as AlT).
i0), and an aluminum alloy is used as the magnetic disk substrate. Therefore, when trying to further improve the positioning accuracy of the magnetic head, the difference in thermal expansion of this material (the coefficient of thermal expansion of the sly I' material (AI Tio) is 7.8 x 10-'/°C, which is different from that of the normal magnetic disk). Aluminum alloy used (At: 94%, Ou: 0.1%,
Si: 0.4%, Fe: 0.4%, Mn: 0.1~
0.3%, Mg: 3.8-4.8%.

Ｏｒ＜０．５チ）の熱膨張係数２３．２　Ｘ　１０−６
層℃）によりサーマルオフトラックが生じ、高い磁気ヘ
ッド位置決め精度を達成出来ない欠点を有していた。Coefficient of thermal expansion of Or<0.5ch) 23.2 x 10-6
This has the disadvantage that thermal off-track occurs due to the layer (°C), making it impossible to achieve high positioning accuracy of the magnetic head.

本発明の目的は、これらの問題点を改善して、サーマル
オフトラックの非常に小さいベリードサーボ方式用薄膜
磁気へ、ドを提供することにある。An object of the present invention is to improve these problems and provide a thin film magnetic field for buried servo system with very small thermal off-track.

本発明によれば、薄膜磁気ヘッドのスライダーにおいて
２つのレール部分以外の部分の材質を磁気ディスクの基
板の熱膨張係数の±３０俤以内の熱膨張係数を有するア
ルミニウム合金にすることにより、データ用トランスデ
ユーサとサーボ用トランスデユーサの熱膨張による位置
の変化を磁気ディスクの熱膨張によるトラック位置の変
化とほぼ同じにし、サーマルオフトラックを大幅に小さ
くすること゛が出来る。According to the present invention, the material of the slider of the thin film magnetic head other than the two rails is made of an aluminum alloy having a coefficient of thermal expansion within ±30 degrees of the coefficient of thermal expansion of the substrate of the magnetic disk. Changes in position due to thermal expansion of the transducer and servo transducer can be made almost the same as changes in track position due to thermal expansion of the magnetic disk, and thermal off-track can be significantly reduced.

以下、本発明の実施例について図面を参照して説明する
。Embodiments of the present invention will be described below with reference to the drawings.

実施例 第１図は従来の薄膜磁気ヘッドスライダ−を、第２図は
本発明の薄膜磁気ヘッドスライダ−の実施例を示す。Embodiment FIG. 1 shows a conventional thin film magnetic head slider, and FIG. 2 shows an embodiment of the thin film magnetic head slider of the present invention.

第１図において、スライダー１の材質はアルミナ・チタ
ン・カーバイト（ＡＩＴｉＯ）であり、その熱膨（５） 張係数は７．８Ｘ１０−６層℃である。そしてベリード
サーボ方式としてトランスデユーサ２をサーボ用として
、トランスデユーサ３をデータ記録再生用トシて用いる
場合について考エル。In FIG. 1, the material of the slider 1 is alumina titanium carbide (AITiO), and its coefficient of thermal expansion (5) is 7.8×10 −6 degrees Celsius. Next, we will consider a case where the transducer 2 is used for servo and the transducer 3 is used for data recording and reproduction in a buried servo system.

磁気ディスクの基板を通常磁気ディスク基板に用いるア
ルミニウム合金とすると、その熱膨張係数は２３．２　
Ｘ　１０−’／℃である。従って磁気ヘッドスライダ−
と磁気ディスク基板の熱膨張係数とは３倍程度の相違が
ある。If the magnetic disk substrate is made of an aluminum alloy normally used for magnetic disk substrates, its coefficient of thermal expansion is 23.2.
X 10-'/°C. Therefore, the magnetic head slider
There is a difference of about three times between the coefficient of thermal expansion and the coefficient of thermal expansion of the magnetic disk substrate.

従って温度４０℃で記録されたデータを温度２Ｉπ再生
すると、その薄膜磁気ヘッドの位置決め誤差は、薄膜ヘ
ッドスライダ−と磁気ディスク基板との熱膨張係数の差
により１μｍ近くの誤差を生じるという欠点を有してい
る。Therefore, when data recorded at a temperature of 40°C is reproduced at a temperature of 2Iπ, the positioning error of the thin-film magnetic head has the disadvantage of causing an error of nearly 1 μm due to the difference in thermal expansion coefficient between the thin-film head slider and the magnetic disk substrate. are doing.

そこでこれらの欠点を解消する喪めに、提案された本発
明をその実施例に基いて説明する。ここでも磁気ディス
ク基板はアルミニウム合金とする。Therefore, in order to eliminate these drawbacks, the proposed invention will be explained based on its embodiments. Here again, the magnetic disk substrate is made of aluminum alloy.

第２図に示す薄膜磁気ヘッドスライダ−は３つの部分に
分離され、２つのＡｌＴｉ０材料からなるレール４．５
とそれらを結合するアルミニウム合金（６） ６から成り立っている。The thin-film magnetic head slider shown in FIG. 2 is separated into three parts, and consists of two rails 4.
and an aluminum alloy (6) 6 that connects them.

このような構造においてアルミニウム合金６の材質とし
て磁気ディスク基板のアルミニウム合金の熱膨張係数に
ごく近い値を持つ材質か又は前記基板のアルミニウム合
金と同一の材質を用いることによりサーマルオフトラッ
クをほとんど外くず程度の誤差に抑えるためには、第２
図の構造のスライダーのアルミニウム合金６の熱膨張係
数は磁気ディスクのアルミニウム合金の熱膨張係数の±
３０％以内にあればよく、さらに望ましくは前記アルミ
ニウム合金６０材質は磁気ディスクのアルミニウム合金
の材質と同一にするとよい。In such a structure, by using a material having a thermal expansion coefficient very close to that of the aluminum alloy of the magnetic disk substrate or the same material as the aluminum alloy of the substrate as the material of the aluminum alloy 6, the thermal off-track can be almost completely removed. In order to suppress the error to a certain degree, the second
The thermal expansion coefficient of the aluminum alloy 6 of the slider with the structure shown in the figure is ± the thermal expansion coefficient of the aluminum alloy of the magnetic disk.
It is sufficient that it is within 30%, and more preferably, the material of the aluminum alloy 60 is the same as the material of the aluminum alloy of the magnetic disk.

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

第１図は従来の薄膜磁気ヘッドスライダ−を示す図、第
２図は本発明のベリードサーボ方式用薄膜ヘッドスライ
ダ−を示す図。図において、１はスライダー（材質Ａｌ
Ｔｉ０） ２はデータ記録再生用トランスデユーサ３はサーボ再生
用トランスデユーサ ４．５はレール ６はアルミニウム合金を示す。 オ　１　図 第２図FIG. 1 shows a conventional thin film magnetic head slider, and FIG. 2 shows a buried servo type thin film head slider according to the present invention. In the figure, 1 is a slider (material: Al
Ti0) 2 indicates a data recording/reproduction transducer 3, a servo reproduction transducer 4.5, and a rail 6 made of aluminum alloy. E 1 Figure 2

Claims (2)

【特許請求の範囲】[Claims] （１）磁気ディスク装置用薄膜磁気ヘッドにおいてスラ
イダーのレール部以外の部分の材料を磁気ディスク基板
の熱膨張係数の±３０％以内の熱膨張係数を有する材料
を用いたことを特徴とするベリードサーボ方式用薄膜磁
気ヘラ　ド０(1) A buried servo system characterized in that, in a thin-film magnetic head for a magnetic disk device, the material for the parts other than the rail portion of the slider is a material having a coefficient of thermal expansion within ±30% of the coefficient of thermal expansion of the magnetic disk substrate. Thin film magnetic heald 0 （２）スライダーのレール部以外の部分の材料を磁気デ
ィスク基板と同一の材料とする特許請求の範囲第１項に
記載のベリードサーボ方式用薄膜磁気へ、ド。(2) A thin film magnet for a buried servo system according to claim 1, wherein the material of the slider other than the rail portion is the same material as the magnetic disk substrate.
JP17075583A 1983-09-16 1983-09-16 Thin film magnetic head for varied servocontrol system Pending JPS6061914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17075583A JPS6061914A (en) 1983-09-16 1983-09-16 Thin film magnetic head for varied servocontrol system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17075583A JPS6061914A (en) 1983-09-16 1983-09-16 Thin film magnetic head for varied servocontrol system

Publications (1)

Publication Number Publication Date
JPS6061914A true JPS6061914A (en) 1985-04-09

Family

ID=15910783

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17075583A Pending JPS6061914A (en) 1983-09-16 1983-09-16 Thin film magnetic head for varied servocontrol system

Country Status (1)

Country Link
JP (1) JPS6061914A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08106621A (en) * 1994-10-07 1996-04-23 Nec Corp Floating type magnetic head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08106621A (en) * 1994-10-07 1996-04-23 Nec Corp Floating type magnetic head

Similar Documents

Publication Publication Date Title
US4581663A (en) Buried servo recording system having dual transducers
EP0105502B1 (en) Perpendicular magnetic recording method
JPS60177420A (en) Composite type thin film magnetic head and its production
JPH0373054B2 (en)
JPS6061914A (en) Thin film magnetic head for varied servocontrol system
JPS61276110A (en) Magneto-resistance effect type magnetic head
JP2003296911A (en) Magnetic recording medium and magnetic recording / reproducing apparatus using the same
JPS62172515A (en) Thin film magnetic head for varied servo system
JPS62121917A (en) Buried servo type thin film magnetic head
JPH0217844B2 (en)
JP2751653B2 (en) Magnetoresistive head
JPS5996517A (en) magnetic recording and reproducing device
JPS61202388A (en) Magnetic double layer disk for buried servo system
JPS5954028A (en) Track following servo system of magnetic disk device
JPH0527165B2 (en)
JPH04268208A (en) Magnetic recording medium and production thereof
JPS5954029A (en) Track following servo system of magnetic disk device
JPS58115632A (en) magnetic recording medium
JPS5948820A (en) Track servo system of magnetic disk device
JPS62298016A (en) Magnetic disk device
JPH0125124B2 (en)
JPS6364611A (en) Thin film magnetic head for buried servo system
JPS59218626A (en) Vertical magnetic recording medium
JPH01285019A (en) magnetic recording medium
JPS6295702A (en) Magnetic disc device