JPS59227066A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS59227066A
JPS59227066A JP10345883A JP10345883A JPS59227066A JP S59227066 A JPS59227066 A JP S59227066A JP 10345883 A JP10345883 A JP 10345883A JP 10345883 A JP10345883 A JP 10345883A JP S59227066 A JPS59227066 A JP S59227066A
Authority
JP
Japan
Prior art keywords
magnetic
magnetic disk
magnetic head
arm
glass
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
JP10345883A
Other languages
Japanese (ja)
Inventor
Yoshibumi Mizoshita
義文 溝下
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10345883A priority Critical patent/JPS59227066A/en
Publication of JPS59227066A publication Critical patent/JPS59227066A/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
    • 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
    • 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
    • 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
    • G11B5/54—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 into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • 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
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • G11B5/82—Disk carriers

Landscapes

  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Moving Of Heads (AREA)

Abstract

PURPOSE:To constitute a titled device so that a magnetic head is scarcely shifted from a track position due to the temperature variation of the inside of a device by forming a magnetic disk by a glass plate having a magnetic layer on the surface, and also forming a magnetic head supporting arm of a magnetic head driving assembly by alumina or silicon nitride. CONSTITUTION:An arm 11 of a magnetic disk device is formed by sintering a silicon nitride which is approximate to the coefficient of thermal expansion of a tempered glass and also has the value of an extremely small coefficient of thermal expansion, in the shape of a thin rectangular parallelepiped by using a mold jig. Also, one end part of this arm 11 is attached to the prescribed position of a truck 4 by metallic fittings 12, and on its other end part, a metallic gimbals structure body 13 which holds the magnetic head consisting of a slider and a coil, and also moves up and down freely is installed. This sintered body of silicon nitride is higher than the glass as to its hardness, and it is scarcely damaged by a shock. Also, a magnetic disk uses a glass substrate whose hardness is high and also whose surface working accuracy is high, and forms a magnetic film consisting of gamma-Fe2O3 on its surface by a spattering method.

Description

【発明の詳細な説明】 （ａｌ　　発明の技術分野 本発明は磁気ディスク装置に係り、特に磁気ディスク基
板にガラスを用いた磁気ディスク装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a magnetic disk device, and more particularly to an improvement in a magnetic disk device using glass for a magnetic disk substrate.

（ｂ）　　技術の背景 アルミニウム（ＡＩ）のような非磁性体基板表面にγ−
酸化鉄（γ−Ｆｅ２Ｏ３）のような磁性膜を形成して磁
気ディスクを形成し、該磁気ディスクを高速で回転させ
ることで磁気ディスク上に空気流を形成し、この空気流
によってディスク上に設置されている磁気ヘッドを浮上
させ、磁気ディスクと磁気ヘッド間に生じる磁束により
情報の記録再生を行う磁気ディスク装置は周知である。(b) Background of the technology γ-
A magnetic film such as iron oxide (γ-Fe2O3) is formed to form a magnetic disk, and by rotating the magnetic disk at high speed, an airflow is formed on the magnetic disk, and this airflow causes the installation on the disk. 2. Description of the Related Art A magnetic disk device is well known in which information is recorded and reproduced using a magnetic flux generated between a magnetic disk and a magnetic head by floating a magnetic head thereon.

（Ｃ１従来技術と問題点 このような磁気ディスク装置について第１図の模式図を
用いて説明する。(C1 Prior Art and Problems Such a magnetic disk device will be explained using the schematic diagram of FIG. 1.

図示するように磁気ディスクＩＡ、ＩＢ、ＩＣ・・・・
・が所定の間隔を隔てて多数積層して配設されており、
この磁気ディスクの間にはアーム２に取りつけられた磁
気ヘッド３が設置されている。この磁気ヘッド３は一本
のアーム２の上下に２個ずつ所定の距離Ａ、を隔てて設
置されている。磁気ディスクが停止している時には、こ
れら２個一組の磁気ヘッドの片方は磁気ディスクＩＡの
裏面に、また他方の２個一組の磁気ヘッドは磁気ディス
クＩＢの表面にそれぞれ接触しているが、磁気ディスク
が高速で回転するとその表面に発生する空気流によって
磁気ヘッドが所定の間隔を隔てて、磁気ディスク面より
浮上するようになる。そしてアーム２を保持している台
車４をヘッドアクチュエータ（ヘッド駆動部）５により
駆動させることで、アーム２に保持されている磁気へラ
ド３を磁気ディスクの所定のトラック位置に移動させ、
・イ青報の記録再生を行っている。As shown in the figure, magnetic disks IA, IB, IC...
・A large number of layers are arranged at predetermined intervals,
A magnetic head 3 attached to an arm 2 is installed between the magnetic disks. Two magnetic heads 3 are installed above and below one arm 2 at a predetermined distance A apart. When the magnetic disk is stopped, one of these two magnetic heads is in contact with the back surface of the magnetic disk IA, and the other two magnetic heads are in contact with the surface of the magnetic disk IB. When the magnetic disk rotates at high speed, airflow generated on the surface of the magnetic disk causes the magnetic head to float above the surface of the magnetic disk at a predetermined distance. Then, by driving the cart 4 holding the arm 2 by the head actuator (head drive unit) 5, the magnetic heald 3 held by the arm 2 is moved to a predetermined track position on the magnetic disk.
・I am recording and playing back the blue news.

従来このような磁気ディスク装置における磁気ディスク
の基板としては、ＡＩが一般に用いられている。ＡＩは
比重が小さい上にある程度の強度を持ち、また加工も比
較的容易であるので、現在広く使用されている。しかし
最近磁気ディスク装置においては、益々磁気記録密度を
向上させることが要求されており、そのため磁気ヘッド
を磁気ディスクに出来るだけ近接させて磁気ヘッドと磁
気ディスク間で生じる磁束密度を向上させることが図ら
れている。ところがこのように磁気ヘッドを磁気ディス
クに近接させると磁気ヘッドが磁気ディスクに衝突する
（ヘッドクラッシュ）現象が生じるおそれがあり、この
ヘッドクラッシュにより基板表面が窪み、従って高信頼
度の記録再生特性が得られない不都合を生じている。こ
の基板表面が窪むのは基板を形成するＡＩの硬度が比較
的小さく、そのため磁気ヘッドが磁気ディスクに衝突し
た時に磁気ディスクの表面が窪むとされている。Conventionally, AI is generally used as a substrate for a magnetic disk in such a magnetic disk device. AI is currently widely used because it has a low specific gravity, a certain degree of strength, and is relatively easy to process. However, recently there has been a demand for increasing the magnetic recording density of magnetic disk drives, and for this reason, it is desirable to bring the magnetic head as close to the magnetic disk as possible to improve the magnetic flux density generated between the magnetic head and the magnetic disk. It is being However, when the magnetic head is brought close to the magnetic disk in this way, there is a risk that the magnetic head collides with the magnetic disk (head crash), and this head crash causes the substrate surface to become depressed, thus impairing highly reliable recording and playback characteristics. This is causing inconveniences that cannot be obtained. It is said that the reason why the substrate surface is depressed is because the hardness of the AI forming the substrate is relatively low, which is why the surface of the magnetic disk is depressed when the magnetic head collides with the magnetic disk.

そのためへッドクラソシュの現象が生じても基板表面に
窪みが起こりにくくするため硬度の大きい、また表面仕
上げ精度が高い状態で加工出来うるガラス基板を磁気デ
ィスクに最近用いるようになってきている。For this reason, glass substrates that have high hardness and can be processed with high surface finish accuracy have recently been used for magnetic disks in order to prevent dents from forming on the substrate surface even if the phenomenon of head cracking occurs.

しかし磁気ヘッドを支持するアームには加工が容易で比
重の比較的小さいＡＩが用いられており、磁気ディスク
装置を駆動させた時、装置内部の発熱によって基板を形
成するガラスとアームを形成するＡＩとでは熱膨張係数
が異なり、磁気ヘッドが磁気ディスクの所定のトランク
位置より位置ずれするオフトランク現象が起こり、高信
頼度の記録再生特性が得られない問題点がある。However, the arm that supports the magnetic head is made of AI, which is easy to process and has a relatively low specific gravity.When the magnetic disk drive is driven, heat is generated inside the device, causing the glass that forms the substrate and the AI that forms the arm to The thermal expansion coefficients are different between the two, and an off-trunk phenomenon occurs in which the magnetic head is displaced from a predetermined trunk position of the magnetic disk, resulting in the problem that highly reliable recording and reproducing characteristics cannot be obtained.

即ち磁気ディスクＩＡに設置された２個一組の磁気ヘッ
ド３の間の距離１１は磁気ディスク装置の温度がΔｔ　
”ｃ変化すると第（１）式のようにβ′１となる。That is, the distance 11 between a pair of magnetic heads 3 installed on the magnetic disk IA is determined by the temperature Δt of the magnetic disk device.
``When c changes, it becomes β'1 as shown in equation (1).

ｊ＋　　＝　　（１＋αΔｔ）Ｘ、　　・・・・・・・
＋１１ここでαはヘッドを保持するアームを形成する旧
の熱膨張係数である。j+ = (1+αΔt)X, ・・・・・・・・・
+11 where α is the old coefficient of thermal expansion forming the arm that holds the head.

一方情報を記録再生する磁気ディスクに２個一組の磁気
へラド３で書き込まれた２本のトランク間の距離１２は
、この情報を読みだす時に磁気ディスク装置の温度がΔ
ｔ　’ｃ変化すると第（２）式のようにＡ／２に変化す
る。On the other hand, the distance 12 between two trunks written on a magnetic disk for recording and reproducing information using a pair of magnetic disks 3 means that the temperature of the magnetic disk device is Δ when reading this information.
When t'c changes, it changes to A/2 as shown in equation (2).

ｊ！！’２＝（１＋βΔ１）　１１２・・・・・・・・
・・（２）ここでβは磁気ディスクを形成するガラスの
熱膨張係数である。ここで２個一組の磁気ヘッド３で書
き込まれるトランクが同一温度で書き込まれたとすると
ｊ！、＝１２となる。磁気ディスクに情報を書き込む時
とその情報を読みだす時で装置の温度がΔｔ’ｃ変化す
ると、２個一組の磁気ヘッド間の間隔が変動した距離と
トラック間の間隔が変動した距離との差εは第（３）式
のようになる。j! ! '2=(1+βΔ1) 112・・・・・・・・・
...(2) Here, β is the coefficient of thermal expansion of the glass forming the magnetic disk. Assuming that the trunks written by a set of two magnetic heads 3 are written at the same temperature, j! ,=12. If the temperature of the device changes by Δt'c between when writing information to the magnetic disk and when reading that information, the distance by which the distance between a pair of magnetic heads has changed and the distance by which the distance between tracks has changed will change. The difference ε is given by equation (3).

ε＝ｉ′１−β′２＝（α−β）Δｔｊ！、・・・・・
（３）このεの値が小さい程、高記録密度の磁気ディス
ク装置が可能となり、そのためには磁気ディスクの熱膨
張係数とアームの熱膨張係数が同一になるか、あるいは
無視できる程小さくすることが必要となる。そこでアー
ムを形成する材料としてガラスを用いることも考えたが
、アームを台車に取りつける際に破損したり、あるいは
高速で磁気ディスクを回転させるのでディスクに衝突し
た時、破損するおそれがある。ε=i′1−β′2=(α−β)Δtj! ,...
(3) The smaller the value of ε, the higher the recording density of the magnetic disk device becomes possible, and for this purpose, the coefficient of thermal expansion of the magnetic disk and the coefficient of thermal expansion of the arm must be the same or negligibly small. Is required. Therefore, we considered using glass as the material for forming the arms, but there was a risk that the arms would be damaged when attached to the trolley, or that they would be damaged when the magnetic disks were rotated at high speed and collided with the disks.

（ｄｌ　　発明の目的 本発明は上記した事項に鑑みてなされたもので磁気ディ
スクに硬度が大きく表面仕上げ精度が高度に加工できる
ガラス基板を用い、更に硬度が大きく熱膨張係数がガラ
スに近接した材料でアームを形成し、装置内部の温度変
化により磁気ヘッドが磁気ディスクの所望のトラック位
置から位置ずれし難くした新規な磁気ディスク装置の提
供を目的とするものである。(dl Purpose of the Invention The present invention was made in view of the above-mentioned problems, and uses a glass substrate that has high hardness and can be processed with high surface finish accuracy for the magnetic disk, and is made of a material that has high hardness and a coefficient of thermal expansion close to that of glass. It is an object of the present invention to provide a novel magnetic disk device in which an arm is formed with a magnetic disk so as to make it difficult for a magnetic head to shift from a desired track position on a magnetic disk due to temperature changes inside the device.

（ｅｌ　　発明の構成 かかる目的を達成するための本発明の磁気ディスク装置
は、磁気ヘッドと磁気ディスクと磁気へラド駆動用アセ
ンブリからなる構成の磁気ディスク装置の前記磁気ディ
スクが表面に磁性層が形成されたガラス板で形成され、
かつ前記磁気へ・／ド駆動用アセンブリの磁気ヘッド支
持用アームがアルミナあるいは窒化珪素により形成され
ていることを特徴とするものである。(el) Structure of the Invention In order to achieve the above object, the magnetic disk device of the present invention has a magnetic disk device having a structure consisting of a magnetic head, a magnetic disk, and a magnetic helad drive assembly, in which a magnetic layer is formed on the surface of the magnetic disk. It is formed from a glass plate made of
Further, the magnetic head supporting arm of the magnetic head/drive assembly is made of alumina or silicon nitride.

（ｆ）　　発明の実施例 以下図面を用いて本発明の一実施例につき詳細に説明す
る。(f) Embodiment of the Invention An embodiment of the invention will be described in detail below with reference to the drawings.

第２図は本発明の磁気ディスク装置のアームの部分を模
式的に示した平面図である。FIG. 2 is a plan view schematically showing the arm portion of the magnetic disk device of the present invention.

図示するように本発明の磁気ディスク装置のアーム１１
は、強化ガラス（例えばパイレックス）の熱膨張係数（
３〜３．６　ｘ　１０＝　／　’ｃ　）に近接してかつ
極めて小さい熱膨張係数の値（３〜４　Ｘｌ０−６／℃
）を有する窒化珪素を型治具を用いて薄い直方体形状に
焼結して形成する。そしてこのアーム１１の一端部は金
具１２によって台車４の所定の位置に取りつけられてお
り、その他端部には、スライダとコイルとからなる磁気
ヘッド（図示せず）を保持し、かつ上下に自在に移動す
る金属製のジンバル構造体１３が設置されている。この
窒化珪素の焼結体はガラスに比して硬度が大きく衝撃に
対して容易に破損しない。As shown in the figure, an arm 11 of a magnetic disk device of the present invention
is the coefficient of thermal expansion of tempered glass (e.g. Pyrex) (
The value of the coefficient of thermal expansion is close to 3-3.6 x 10 = / 'c) and extremely small (3-4
) is sintered into a thin rectangular parallelepiped shape using a mold jig. One end of this arm 11 is attached to a predetermined position on the trolley 4 with a metal fitting 12, and the other end holds a magnetic head (not shown) consisting of a slider and a coil, and is movable up and down. A metal gimbal structure 13 that moves is installed. This sintered body of silicon nitride has greater hardness than glass and is not easily damaged by impact.

また磁気ディスクは硬度が大きく、かつ表面加工精度の
大きいガラス基板を用いて、その表面にγ−ｐｅ２０３
よりなる磁性膜をスパッタ法で形成する。In addition, the magnetic disk uses a glass substrate with high hardness and high surface processing accuracy, and the surface is coated with γ-pe203.
A magnetic film made of the following is formed by sputtering.

このように磁気ディスクの基板にガラスを用いまた磁気
ヘッドをガラスとほぼ同等の熱膨張係数を有する窒化珪
素で形成した本発明の磁気ディスク装置によれば、磁気
ディスク装置の内部の温度上昇が生じても、磁気ヘッド
と磁気ディスクの位置変動の少ない磁気ディスク装置が
得られる。According to the magnetic disk device of the present invention, in which the substrate of the magnetic disk is made of glass and the magnetic head is made of silicon nitride, which has a coefficient of thermal expansion almost equal to that of glass, the temperature inside the magnetic disk device increases. However, a magnetic disk device with less variation in the position of the magnetic head and the magnetic disk can be obtained.

なお、上記は磁気ディスク基板に強化ガラスを用いた例
であるが、ソーダガラスを用いた場合はソーダガラスの
熱膨張係数（８〜１ｏ　ｘ　ｔｏ−６＞に合わせて熱膨
張係数が８ＸＩＯ−６程度であるアルミナをアーム材料
とするのが適当である。Note that the above is an example in which tempered glass is used for the magnetic disk substrate, but when soda glass is used, the thermal expansion coefficient is 8 It is appropriate to use alumina as the arm material.

（ｇｌ　　発明の効果 以上述べたように本発明の磁気ディスク装置によれば、
サーマルオフトランク現象の少ない高信頼度の磁気ディ
スク装置が得られる効果を生じる。(gl Effects of the Invention As described above, according to the magnetic disk device of the present invention,
The effect is that a highly reliable magnetic disk device with less thermal off-trunk phenomenon can be obtained.

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

第１図は磁気ディスク装置の模式図で第２図は本発明の
磁気ディスク装置の要部平面図である。 図に於いてＩＡ、ＩＢ、ＩＣ・・・・・は磁気ディスク
、２．１１はアーム、３は磁気ヘッド、４は台車、５は
ヘンドアクチユニーター、１２は金具、１３はジンバル
構造体、１１は磁気ヘッド間の距離を示す。FIG. 1 is a schematic diagram of a magnetic disk device, and FIG. 2 is a plan view of essential parts of the magnetic disk device of the present invention. In the figure, IA, IB, IC... are magnetic disks, 2.11 is an arm, 3 is a magnetic head, 4 is a trolley, 5 is a hand actuator, 12 is a metal fitting, and 13 is a gimbal structure. , 11 indicate the distance between the magnetic heads.

Claims (1)

【特許請求の範囲】[Claims] 磁気ヘッドと磁気ディスクと磁気ヘッド駆動用アセンブ
リからなる構成の磁気ディスク装置の前記磁気ディスク
が表面に磁性層が形成されたガラス板で形成され、かつ
前記磁気ヘッド駆動用アセンブリの磁気ヘッド支持用ア
ームがアルミナあるいは窒化珪素により形成されている
ことを特徴とする磁気ディスク装置。A magnetic disk device comprising a magnetic head, a magnetic disk, and a magnetic head drive assembly, wherein the magnetic disk is formed of a glass plate with a magnetic layer formed on its surface, and a magnetic head support arm of the magnetic head drive assembly. What is claimed is: 1. A magnetic disk device characterized in that the material is made of alumina or silicon nitride.
JP10345883A 1983-06-08 1983-06-08 Magnetic disk device Pending JPS59227066A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10345883A JPS59227066A (en) 1983-06-08 1983-06-08 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10345883A JPS59227066A (en) 1983-06-08 1983-06-08 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPS59227066A true JPS59227066A (en) 1984-12-20

Family

ID=14354575

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10345883A Pending JPS59227066A (en) 1983-06-08 1983-06-08 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS59227066A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6251571U (en) * 1985-09-18 1987-03-31
JPH03504777A (en) * 1988-02-26 1991-10-17 クウェスト・テクノロジー・コーポレーション Ceramic support arm for movable positioning of the transducer
CN106057223A (en) * 2015-04-06 2016-10-26 Tdk株式会社 Rectifying component for magnetic disk device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6251571U (en) * 1985-09-18 1987-03-31
JPH03504777A (en) * 1988-02-26 1991-10-17 クウェスト・テクノロジー・コーポレーション Ceramic support arm for movable positioning of the transducer
CN106057223A (en) * 2015-04-06 2016-10-26 Tdk株式会社 Rectifying component for magnetic disk device
CN106057223B (en) * 2015-04-06 2018-06-26 Tdk株式会社 Disk set rectification part

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