JPH04319594A - Magnetic recording device for stably supplying lubricant - Google Patents
Magnetic recording device for stably supplying lubricantInfo
- Publication number
- JPH04319594A JPH04319594A JP8812791A JP8812791A JPH04319594A JP H04319594 A JPH04319594 A JP H04319594A JP 8812791 A JP8812791 A JP 8812791A JP 8812791 A JP8812791 A JP 8812791A JP H04319594 A JPH04319594 A JP H04319594A
- Authority
- JP
- Japan
- Prior art keywords
- lubricant
- recording medium
- recording
- slider
- spacer
- 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
Links
- 239000000314 lubricant Substances 0.000 title claims abstract description 150
- 125000006850 spacer group Chemical group 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 239000010410 layer Substances 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101000582320 Homo sapiens Neurogenic differentiation factor 6 Proteins 0.000 description 1
- 102100030589 Neurogenic differentiation factor 6 Human genes 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は磁気記録装置等に使用さ
れる磁気記録媒体の表面潤滑の改良であり、特に磁気記
録媒体表面に潤滑剤によって被覆される潤滑膜を安定に
維持することに関する。[Field of Industrial Application] The present invention relates to improving the surface lubrication of magnetic recording media used in magnetic recording devices, etc., and particularly relates to stably maintaining a lubricant film coated with a lubricant on the surface of the magnetic recording media. .
【０００２】0002
【従来の技術】近年の記録情報の急激な増加に伴って、
磁気記録装置の高記録密度化が求められている。高記録
密度化に関しては、特公平２−２２２０ 号公報に記載
のように、磁気ヘッドスライダ（以下単にスライダ）と
円板状磁気記録媒体（以下単に記録媒体）の磁性膜との
間隔（以下スペーシング）を狭くして、電磁変換特性を
向上させる必要がある。しかし、スペーシングの狭小化
を図ると、スライダが記録媒体の表面層と接触する確率
が高くなり、接触を起した場合に磁性層を破壊するばか
りではなく、時にはスライダのヘッドコアの破壊をも引
き起こすことがある。[Background Art] With the rapid increase in recorded information in recent years,
There is a need for higher recording densities in magnetic recording devices. Regarding higher recording density, as described in Japanese Patent Publication No. 2-2220, the distance between the magnetic head slider (hereinafter simply referred to as slider) and the magnetic film of a disc-shaped magnetic recording medium (hereinafter simply referred to as recording medium) (hereinafter simply referred to as slider) is It is necessary to narrow the pacing (pacing) and improve electromagnetic conversion characteristics. However, as the spacing is made narrower, the probability that the slider comes into contact with the surface layer of the recording medium increases, and when contact occurs, it not only destroys the magnetic layer but also sometimes causes damage to the head core of the slider. Sometimes.
【０００３】また、スライダの浮上量を減少させるため
、コンタクトスタ−トストップ方式（以下ＣＳＳ）と呼
ばれる浮上方式で磁気記録を行っている。この方式では
、通常スライダが回転時の空気力学的な力を受けて記録
媒体表面から浮上してから記録情報の読み書きを行なう
。しかし、スライダが浮上するために必要な力を受ける
までの時間、すなわち、記録媒体がある回転数になるま
での間は、スライダと記録媒体表面は接触している。
回転している記録媒体が停止する時も、同様な接触状態
になっている。Furthermore, in order to reduce the flying height of the slider, magnetic recording is performed using a flying method called a contact start-stop method (hereinafter referred to as CSS). In this method, recorded information is normally read and written after the slider floats above the surface of the recording medium due to aerodynamic force during rotation. However, the slider and the surface of the recording medium remain in contact until the slider receives the force necessary to float, that is, until the recording medium reaches a certain rotation speed. A similar contact state occurs when the rotating recording medium comes to a stop.
【０００４】このように、スライダと記録媒体表面とは
接触するので、潤滑能力のない記録媒体を使用すると記
録媒体の表面層は摩耗してしまうことになる。そのため
、現在は金属基板表面上に磁性層を形成後、カ−ボンや
酸化ケイ素等の保護膜を形成し、さらに潤滑剤、例えば
フロロカ−ボン系の有機潤滑剤等を塗布、あるいは他の
手法で蒸着させて、潤滑膜を記録媒体の表面に形成させ
ている。なお、潤滑膜は潤滑剤を構成する分子の単分子
層と考えられている。[0004] As described above, since the slider and the surface of the recording medium come into contact with each other, if a recording medium without lubrication ability is used, the surface layer of the recording medium will wear out. Therefore, currently, after forming a magnetic layer on the surface of a metal substrate, a protective film such as carbon or silicon oxide is formed, and then a lubricant such as a fluorocarbon-based organic lubricant is applied, or other methods are used. A lubricating film is formed on the surface of the recording medium. Note that the lubricant film is considered to be a monomolecular layer of molecules that constitute the lubricant.
【０００５】[0005]
【発明が解決しようとする課題】しかし、超高記録密度
化のためにスペーシングが一層狭小化されると、通常の
回転時にスライダが浮上している場合でも、間欠的にス
ライダと記録媒体が接触する頻度が増大し、ＣＳＳ時間
は、浮上時にも潤滑膜が消失する可能性がある。さらに
、接触が続けば、記録媒体の表面で、例えば保護膜が摩
耗され、さらには磁性層が破壊されることとなり、重大
な障害、例えば、記録情報の破壊等に至る。[Problems to be Solved by the Invention] However, as the spacing becomes narrower to achieve ultra-high recording densities, even when the slider is floating during normal rotation, the slider and recording medium may intermittently become disconnected. The frequency of contact increases, and during CSS time, there is a possibility that the lubricant film will disappear even during levitation. Furthermore, if the contact continues, for example, the protective film on the surface of the recording medium will be worn away, and furthermore, the magnetic layer will be destroyed, leading to serious damage, such as destruction of recorded information.
【０００６】本発明の目的は、記録媒体表面の潤滑膜を
安定に維持する潤滑剤を供給方法する磁気記録装置を提
供することにある。An object of the present invention is to provide a magnetic recording device that provides a lubricant supply method that stably maintains a lubricant film on the surface of a recording medium.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記目的を達
成するため、特許請求の範囲の各請求項記載の構成を特
徴とするものである。Means for Solving the Problems In order to achieve the above object, the present invention is characterized by the configurations described in each claim.
【０００８】[0008]
【作用】記録媒体を回転させると、前記記録媒体表面に
塗布されている潤滑剤の膜厚が、外周側では厚く、内周
側では薄くなる現象が起こる。この原因は、記録媒体表
面で、前記潤滑剤が内周側から外周側へと移動している
ためである。[Operation] When a recording medium is rotated, a phenomenon occurs in which the film thickness of the lubricant applied to the surface of the recording medium becomes thicker on the outer circumferential side and thinner on the inner circumferential side. This is because the lubricant moves from the inner circumferential side to the outer circumferential side on the surface of the recording medium.
【０００９】図７は記録媒体表面の潤滑剤に作用する力
を示す図である。潤滑剤には、記録媒体の回転に伴って
発生する遠心力Ｆ１ と、遠心力と反対方向の剪断力Ｆ
２ が作用する。遠心力Ｆ１ と剪断力Ｆ２ は次のそ
れぞれ数１と数２式で表される。なお、潤滑剤はニュー
トン流体であるとする。FIG. 7 is a diagram showing the force acting on the lubricant on the surface of the recording medium. The lubricant contains centrifugal force F1 generated as the recording medium rotates, and shearing force F1 in the opposite direction to the centrifugal force.
2 comes into play. The centrifugal force F1 and the shearing force F2 are expressed by the following equations 1 and 2, respectively. It is assumed that the lubricant is a Newtonian fluid.
【００１０】0010
【数１】[Math 1]
【００１１】[0011]
【数２】[Math 2]
【００１２】遠心力と剪断力の差である力Ｆ１ −Ｆ２
（以下移動力）が潤滑剤を記録媒体の内周側から外周
側へ移動させる力である。Force F1 - F2 which is the difference between centrifugal force and shear force
(hereinafter referred to as moving force) is a force that moves the lubricant from the inner circumferential side to the outer circumferential side of the recording medium.
【００１３】ここで、記録媒体表面の任意の地点に着目
すると、この地点では潤滑剤の移動に伴い、回転時に絶
えず新しい潤滑剤が供給される。このため、スライダと
記録媒体とが接触して潤滑剤に摩耗が生じた場合でも、
この接触面では一時的な摩耗であって、完全に摩耗され
ることはない。すなわち、前記接触や摩擦熱等により記
録媒体表面の潤滑剤が消失しても、新しい潤滑剤が補給
されるので、記録媒体の表面の摩耗ひいては磁性層の破
壊を防ぐことができる。[0013] Focusing on an arbitrary point on the surface of the recording medium, new lubricant is constantly supplied at this point during rotation as the lubricant moves. Therefore, even if the slider and recording medium come into contact and the lubricant wears out,
This contact surface is only temporarily worn and is not completely worn away. That is, even if the lubricant on the surface of the recording medium disappears due to the contact, frictional heat, etc., new lubricant is replenished, so that wear on the surface of the recording medium and further damage to the magnetic layer can be prevented.
【００１４】さて、記録媒体表面の内周側の潤滑剤分子
はこの作用によって外周側に移動してしまうので、記録
媒体表面の最内周部に外部から潤滑剤を補給する必要が
ある。そこで、記録媒体内径側に潤滑剤供給源を設け、
潤滑剤供給源から記録媒体表面に潤滑剤を供給する潤滑
剤供給系を設ければ、記録媒体表面に潤滑剤を供給する
ことができる。Since the lubricant molecules on the inner circumferential side of the recording medium surface move toward the outer circumferential side due to this action, it is necessary to replenish the lubricant from the outside to the innermost circumferential portion of the recording medium surface. Therefore, a lubricant supply source is provided on the inner diameter side of the recording medium.
By providing a lubricant supply system that supplies lubricant from a lubricant supply source to the surface of the recording medium, the lubricant can be supplied to the surface of the recording medium.
【００１５】ところで、記録媒体表面の潤滑剤の粘度が
一様な場合、剪断力は粘度と同様に一様となり、移動力
は遠心力によって決定される。記録媒体の内周側と外周
側とでは遠心力が異なるので、移動力に相違が生じる。
そのため、潤滑剤の移動速度に相違が生じてしまい、記
録媒体表面の潤滑剤の厚さが一様にならなくなる恐れが
ある。By the way, if the viscosity of the lubricant on the surface of the recording medium is uniform, the shearing force will be uniform like the viscosity, and the moving force will be determined by the centrifugal force. Since the centrifugal force is different between the inner circumferential side and the outer circumferential side of the recording medium, a difference occurs in the moving force. Therefore, a difference occurs in the moving speed of the lubricant, and there is a possibility that the thickness of the lubricant on the surface of the recording medium will not be uniform.
【００１６】この問題を解決するために、記録媒体表面
の潤滑剤の粘度を調節して、剪断力を変えることによっ
て移動力を一定にする手段を設ける。この手段として適
当であると考えられるのが、潤滑剤の温度を制御するこ
とである。図９（特開平２−１９３３８７号公報を引用
）に示すように、潤滑剤の粘度は温度に大きく依存し、
温度を上昇させると潤滑剤の粘度は減少する。例えば、
記録媒体の内周側を加熱すると、内周側の潤滑剤の粘度
とともに剪断力が低下する。よって、潤滑剤の移動速度
は加熱しない場合と比較して速くなるので、内周側と外
周側との潤滑剤の移動速度の相違を解消することができ
る。In order to solve this problem, a means is provided to keep the moving force constant by adjusting the viscosity of the lubricant on the surface of the recording medium and changing the shearing force. A suitable means for this is to control the temperature of the lubricant. As shown in Figure 9 (quoting Japanese Patent Application Laid-Open No. 2-193387), the viscosity of the lubricant largely depends on the temperature.
As the temperature increases, the viscosity of the lubricant decreases. for example,
When the inner circumferential side of the recording medium is heated, the shearing force decreases together with the viscosity of the lubricant on the inner circumferential side. Therefore, the moving speed of the lubricant is faster than that in the case where no heating is performed, so it is possible to eliminate the difference in the moving speed of the lubricant between the inner circumferential side and the outer circumferential side.
【００１７】このように記録媒体表面に常に潤滑剤を供
給し、かつ潤滑剤の移動速度も制御できるので、耐摺動
性に優れた磁気記録装置となり、所期の目的が達成され
る。[0017] As described above, since lubricant can be constantly supplied to the surface of the recording medium and the moving speed of the lubricant can also be controlled, a magnetic recording device with excellent sliding resistance can be obtained, and the intended purpose can be achieved.
【００１８】[0018]
【実施例】以下、図面に基づいて本発明を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the drawings.
【００１９】まず、本発明の実施例１を示す。図１は、
本発明によるＣＳＳ方式のヘッドディスクアセンブリ装
置（以下ＨＤＡ）の概略図である。ＨＤＡは、複数の円
板状の記録媒体２と、各記録媒体２の記録表面に対向配
置されたスライダ３と、記録媒体２の間隔を一定に保持
するスペーサ６と、記録媒体２およびスペーサ６を積層
搭載するハブ５と、記録媒体２を回転させる動力源とな
るモータ８と、モータ８の回転力を伝えるスピンドル軸
５と、スライダ３の位置決めを行うアクチュエータ４に
より構成される。First, Example 1 of the present invention will be described. Figure 1 shows
1 is a schematic diagram of a CSS type head disk assembly device (hereinafter referred to as HDA) according to the present invention. The HDA includes a plurality of disk-shaped recording media 2, a slider 3 arranged to face the recording surface of each recording medium 2, a spacer 6 that maintains a constant interval between the recording media 2, and the recording medium 2 and the spacer 6. It is composed of a hub 5 on which are stacked and mounted, a motor 8 serving as a power source for rotating the recording medium 2, a spindle shaft 5 transmitting the rotational force of the motor 8, and an actuator 4 for positioning the slider 3.
【００２０】記録媒体２の表面の潤滑膜の状態を検出す
るために、潤滑膜の厚さを検出する膜圧センサ１１と、
潤滑膜の温度を検出する温度センサ１２を設ける。膜圧
センサ１１と温度センサ１２は、記録媒体２の内周側か
ら外周側の状態まで検出できるように移動できる。膜圧
センサ１１と温度センサ１２の応答は温度制御装置１３
に送られて、その応答に応じて必要量だけ記録媒体２が
発熱するように、温度制御装置１３から記録媒体２にス
リップリング１０を通じて電流を送る。なお、本実施例
では膜圧センサ１１としてフォトエレクトロエミッショ
ン，温度センサ１２として赤外線温度計を用いている。In order to detect the state of the lubricant film on the surface of the recording medium 2, a film pressure sensor 11 that detects the thickness of the lubricant film;
A temperature sensor 12 is provided to detect the temperature of the lubricating film. The membrane pressure sensor 11 and the temperature sensor 12 are movable so as to detect the state from the inner circumferential side to the outer circumferential side of the recording medium 2. The responses of the membrane pressure sensor 11 and temperature sensor 12 are controlled by the temperature control device 13.
A current is sent from the temperature control device 13 to the recording medium 2 through the slip ring 10 so that the recording medium 2 generates heat by the required amount in response to the response. In this embodiment, a photoelectro emission is used as the film pressure sensor 11, and an infrared thermometer is used as the temperature sensor 12.
【００２１】図２は、潤滑剤１５の供給経路を示す図で
ある。ＨＤＡに潤滑剤１５を貯蔵するため、スピンドル
軸１の回転中心に潤滑剤容器１６を設ける。図３に潤滑
剤１５の封印の仕方を示す。潤滑剤１５を潤滑剤容器１
６に補充した後で、潤滑剤容器１６の軸端をメカニカル
シール２１で封印し、スピンドル固定ねじ２２で締め付
ける。構成により潤滑剤１５は外部に漏れず、かつ補充
が容易にできる。FIG. 2 is a diagram showing the supply path of the lubricant 15. A lubricant container 16 is provided at the rotation center of the spindle shaft 1 to store the lubricant 15 in the HDA. FIG. 3 shows how to seal the lubricant 15. Lubricant 15 into lubricant container 1
6, the shaft end of the lubricant container 16 is sealed with a mechanical seal 21 and tightened with a spindle fixing screw 22. Due to the structure, the lubricant 15 does not leak to the outside and can be easily replenished.
【００２２】潤滑剤容器１６の中の潤滑剤１５をハブ５
の外周部まで供給するため、潤滑剤供給路１９をスピン
ドル軸１とハブ５の内部に設ける。本実施例では、潤滑
剤供給路１９を９０度おきに四本設けてあるが、必要に
応じて適当な数だけ設けてよい。The lubricant 15 in the lubricant container 16 is transferred to the hub 5.
A lubricant supply path 19 is provided inside the spindle shaft 1 and the hub 5 in order to supply the lubricant to the outer periphery of the lubricant. In this embodiment, four lubricant supply passages 19 are provided at 90 degree intervals, but an appropriate number may be provided as required.
【００２３】ハブ５の外周部において、潤滑剤１５がス
ピンドル軸方向に満遍なく行き渡るようにするために、
軸方向ハブ溝１７をハブ５の外周部表面に設ける。本実
施例では、軸方向ハブ溝１７を９０度おきに四本設けて
あるが、必要に応じて適当な数だけ設けてよい。さらに
、ハブ５の外周部において潤滑剤１５が周方向に満遍な
く行き渡るようにするために、周方向ハブ溝１８をハブ
５の外周部表面に設ける。周方向ハブ溝１８の間隔はス
ペーサ６と同間隔になるようにする。In order to spread the lubricant 15 evenly in the spindle axial direction on the outer circumference of the hub 5,
An axial hub groove 17 is provided on the outer peripheral surface of the hub 5. In this embodiment, four axial hub grooves 17 are provided at intervals of 90 degrees, but an appropriate number may be provided as required. Further, a circumferential hub groove 18 is provided on the outer circumferential surface of the hub 5 in order to distribute the lubricant 15 evenly in the circumferential direction on the outer circumferential portion of the hub 5. The intervals between the circumferential hub grooves 18 are set to be the same as the intervals between the spacers 6.
【００２４】図４は、潤滑剤供給系の断面図である。ハ
ブ５と接するスペーサ６の表面にスペーサ溝２４を設け
、潤滑剤１５が満遍なくスペーサ６の内周側全域に行き
渡るようにする。スペーサ溝２４から記録媒体２表面に
潤滑剤１５を供給するために、潤滑剤染み出し孔２０を
スペーサ６に適当数設ける。FIG. 4 is a sectional view of the lubricant supply system. A spacer groove 24 is provided on the surface of the spacer 6 in contact with the hub 5 so that the lubricant 15 evenly spreads over the entire inner peripheral side of the spacer 6. In order to supply the lubricant 15 from the spacer grooves 24 to the surface of the recording medium 2, a suitable number of lubricant seepage holes 20 are provided in the spacer 6.
【００２５】図５は、記録媒体２の断面図である。記録
媒体２は発熱体２４を含む構成となっている。発熱体２
４が発熱することにより、記録媒体２の温度を変えるこ
とができる。FIG. 5 is a cross-sectional view of the recording medium 2. As shown in FIG. The recording medium 2 is configured to include a heating element 24. heating element 2
By generating heat from the recording medium 4, the temperature of the recording medium 2 can be changed.
【００２６】図６は、記録媒体２の構造を示したもので
ある。直径５０μｍ程度のステンレス箔線を渦巻状に絶
縁体２７の上に配線し、さらに絶縁体２７を積層して発
熱体２４を製造する。発熱体２４をアルミニウム基板２
５で挾んで貼りあわせ、アルミニウム基板２５表面に磁
性層，保護膜，潤滑膜などを形成することによって、記
録媒体２が製造される。本実施例では、基板材料として
アルミニウムを用いているが、ガラスなどの材料を用い
てもよい。発熱体２４は、電極２８を通じて電流を流す
ことによって発熱する。本実施例では、電極２８を二ヶ
所設けて、記録媒体２の内周側と外周側を別々に発熱で
きるようにしてあるが、必要に応じて電極２８を複数箇
所設けて、任意の地点を発熱できるようにしてもよい。FIG. 6 shows the structure of the recording medium 2. As shown in FIG. A stainless steel foil wire with a diameter of about 50 μm is spirally wired on the insulator 27, and the insulator 27 is further laminated to manufacture the heating element 24. The heating element 24 is connected to the aluminum substrate 2
The recording medium 2 is manufactured by sandwiching and bonding the aluminum substrates 25 to 5 and forming a magnetic layer, a protective film, a lubricating film, etc. on the surface of the aluminum substrate 25. In this embodiment, aluminum is used as the substrate material, but a material such as glass may also be used. The heating element 24 generates heat by passing a current through the electrode 28. In this embodiment, the electrodes 28 are provided at two locations so that heat can be generated separately on the inner and outer circumferential sides of the recording medium 2, but if necessary, the electrodes 28 may be provided at multiple locations to heat the recording medium 2 at any desired point. It may also be possible to generate heat.
【００２７】次に、本発明による実施例一の動作を説明
する。潤滑剤１５はＨＤＡ稼働時に発生する遠心力によ
って、潤滑剤容器１６の中から潤滑剤供給路１９を通じ
てハブ５の外周部に供給される。ハブ５には軸方向ハブ
溝１７と周方向ハブ溝１８が設けてあるので、スペーサ
９と接するハブ５の外周部に満遍なく潤滑剤１５が行き
渡る。潤滑剤１５は周方向ハブ溝１８を通じて、ハブ５
に積層搭載したスペーサ６のスペーサ溝２３に供給され
る。スペーサ溝２３に供給された潤滑剤１５は、潤滑剤
染み出し孔２０を通じて記録媒体２の最内周側の表面に
徐々に染み出してくる。Next, the operation of the first embodiment of the present invention will be explained. The lubricant 15 is supplied from the lubricant container 16 to the outer circumference of the hub 5 through the lubricant supply path 19 by centrifugal force generated during HDA operation. Since the hub 5 is provided with an axial hub groove 17 and a circumferential hub groove 18, the lubricant 15 evenly spreads over the outer circumference of the hub 5 that contacts the spacer 9. The lubricant 15 is applied to the hub 5 through the circumferential hub groove 18.
It is supplied to the spacer groove 23 of the spacer 6 mounted in a stacked manner. The lubricant 15 supplied to the spacer groove 23 gradually seeps out onto the innermost surface of the recording medium 2 through the lubricant seepage hole 20 .
【００２８】記録媒体２の表面に供給された潤滑剤１５
は、移動力によって内周側から外周側へと移動する。潤
滑剤１５の粘度が一定の場合、移動力は記録媒体２の外
周側の方が内周側よりも大きいため、記録媒体２の内周
側を加熱し、内周側の潤滑剤１５の粘度を下げて、剪断
力を低下させる。この作用によって潤滑剤１５の内周側
と外周側の移動速度の相違を解消することができる。Lubricant 15 supplied to the surface of recording medium 2
moves from the inner circumferential side to the outer circumferential side due to the moving force. When the viscosity of the lubricant 15 is constant, the moving force is larger on the outer circumferential side of the recording medium 2 than on the inner circumferential side. to reduce the shear force. This action makes it possible to eliminate the difference in moving speed of the lubricant 15 between the inner and outer circumferential sides.
【００２９】図８に、潤滑剤の一例として水における温
度と粘度の関係を示す。発熱体２４の加熱によって、記
録媒体２が稼働前の状態である２０℃から６０℃に温度
上昇する場合、水の粘度は１．００ｍＰａ・ｓから０．
４７ｍＰａ・ｓと５３％まで減少する。図９には種々の
潤滑剤における温度と粘度の関係を示すが、水と同様の
傾向を示す。このように、潤滑剤１５の粘度は温度を２
０℃から６０℃に上昇させるだけでも、半分程度にまで
低減することができる。つまり、記録媒体の温度変化手
段を設けることによって粘度を制御でき、粘度により記
録媒体２表面の潤滑剤１５の移動力を制御できることに
なる。FIG. 8 shows the relationship between temperature and viscosity of water as an example of a lubricant. When the temperature of the recording medium 2 rises from 20° C., which is the state before operation, to 60° C. due to heating by the heating element 24, the viscosity of water changes from 1.00 mPa·s to 0.00 mPa·s.
It decreases to 47 mPa・s, 53%. FIG. 9 shows the relationship between temperature and viscosity for various lubricants, which shows the same tendency as water. In this way, the viscosity of the lubricant 15 changes as the temperature increases by 2.
By simply increasing the temperature from 0°C to 60°C, the temperature can be reduced to about half. In other words, the viscosity can be controlled by providing the recording medium temperature change means, and the moving force of the lubricant 15 on the surface of the recording medium 2 can be controlled by the viscosity.
【００３０】さらに、膜圧センサ１１と温度センサ１２
を設け、センサの検出量に応じて、発熱体２４の発熱量
をフィードバック制御する。前記手法により、前記移動
力が潤滑膜の状態に対応して制御できる。Furthermore, a membrane pressure sensor 11 and a temperature sensor 12
is provided, and the amount of heat generated by the heating element 24 is feedback-controlled in accordance with the amount detected by the sensor. With the method described above, the moving force can be controlled in accordance with the state of the lubricating film.
【００３１】実施例一によると、記録媒体２表面の潤滑
剤１５を、常時、適度に維持することができ、さらに潤
滑剤１５の移動速度も制御できる。そのため、記録媒体
２におけるスライダ３との摺動面で、潤滑膜の消失また
は軽微な摩耗に留められるので、スペーシングの狭小化
を行っても記録媒体２の表面層の破壊を防ぐことができ
る。According to the first embodiment, the lubricant 15 on the surface of the recording medium 2 can be maintained at a suitable level at all times, and the moving speed of the lubricant 15 can also be controlled. Therefore, the lubricant film on the sliding surface of the recording medium 2 with the slider 3 is limited to loss or slight wear, so even if the spacing is narrowed, destruction of the surface layer of the recording medium 2 can be prevented. .
【００３２】次に、本発明の実施例二を示す。図１０は
本発明によるＨＤＡであり、ＨＤＡは第一実施例を改良
したものである。回転数制御装置２９を設け、ＨＤＡの
読み書き動作以外のときに、記録媒体２の回転数を適度
に調節することによって記録媒体２の表面の潤滑剤１５
の移動速度を加減して、潤滑剤１５によって形成される
潤滑膜が速く一様の膜厚になるようにする。Next, a second embodiment of the present invention will be described. FIG. 10 shows an HDA according to the present invention, which is an improved version of the first embodiment. A rotation speed control device 29 is provided, and the lubricant 15 on the surface of the recording medium 2 is controlled by appropriately adjusting the rotation speed of the recording medium 2 when the HDA is not reading or writing.
The moving speed of the lubricant 15 is adjusted so that the lubricant film formed by the lubricant 15 has a uniform thickness.
【００３３】図１１に、記録媒体２の円板端表面におけ
る潤滑剤１５の様子を示す。移動力によって潤滑剤１５
は外周側へと移動するが、潤滑剤１５の表面張力のため
に記録媒体２の円板端表面に潤滑剤１５が溜ってしまう
ことになる。この状態が続くと潤滑剤１５は内周側から
供給されてくるので、潤滑膜の膜厚が厚くなりすぎてし
まう。そこで、潤滑剤吸収棒３２を記録媒体２の円板端
に当て、潤滑剤吸収装置３１によって吸引力を発生させ
て、円板端に溜った潤滑剤１５を吸収する。吸収された
潤滑剤１５は潤滑剤吸収容器３０に貯蔵される。動作は
ＨＤＡの読み書き動作以外のときに、記録媒体２を低速
で回転させて行う。なお、本実施例では２０ｒｐｍ 程
度の回転速度である。FIG. 11 shows the state of the lubricant 15 on the disk end surface of the recording medium 2. As shown in FIG. Lubricant 15 by moving force
moves toward the outer periphery, but the surface tension of the lubricant 15 causes the lubricant 15 to accumulate on the end surface of the disk of the recording medium 2. If this state continues, the lubricant 15 will be supplied from the inner peripheral side, and the lubricant film will become too thick. Therefore, the lubricant absorbing rod 32 is applied to the disk edge of the recording medium 2, and the lubricant absorbing device 31 generates a suction force to absorb the lubricant 15 accumulated at the disk edge. The absorbed lubricant 15 is stored in a lubricant absorption container 30. The operation is performed by rotating the recording medium 2 at a low speed when the HDA is not reading or writing. In this embodiment, the rotation speed is about 20 rpm.
【００３４】図１２に、ＨＤＡの冷却機構を示す。ＨＤ
Ａに冷却機構を設けずに稼働させると、ＨＤＡが加熱し
てしまい、潤滑剤１５の温度を制御できる温度帯域が狭
まり、潤滑剤１５の移動力制御に支障をきたす恐れがあ
る。そこで、ＨＤＡにエアファンユニット３３を設け、
外気をＨＤＡに取り込む。外気は塵埃進入防止のため清
浄な空気にする必要があるが、更に清浄効果を高めるた
めエアファンユニット３３の下流側に静電フィルタ３４
を設け、外気中の塵埃を集塵する構成とする。また、Ｈ
ＤＡの排出口にも静電フィルタ３４を設け、稼働時に発
生する塵埃を集塵する。FIG. 12 shows the HDA cooling mechanism. HD
If A is operated without a cooling mechanism, the HDA will heat up, and the temperature range in which the temperature of the lubricant 15 can be controlled will be narrowed, which may impede control of the moving force of the lubricant 15. Therefore, an air fan unit 33 is installed in the HDA,
Intake outside air into HDA. The outside air needs to be clean to prevent dust from entering, but an electrostatic filter 34 is installed downstream of the air fan unit 33 to further improve the cleaning effect.
is installed to collect dust in the outside air. Also, H
An electrostatic filter 34 is also provided at the discharge port of the DA to collect dust generated during operation.
【００３５】本実施例は、回転数制御機構，余剰潤滑剤
吸収機構，冷却機構，集塵機構を設けてあるために、実
施例１と比較して、記録媒体２の表面の潤滑剤１５の移
動速度を適度に制御することができ、また塵埃の進入・
発生によるヘッドクラッシュの危険性も回避できる。In this embodiment, since a rotation speed control mechanism, an excess lubricant absorption mechanism, a cooling mechanism, and a dust collection mechanism are provided, the movement of the lubricant 15 on the surface of the recording medium 2 is faster than in the first embodiment. The speed can be controlled appropriately, and the ingress of dust and
It is also possible to avoid the risk of head crashes occurring.
【００３６】次に、本発明の実施例三を示す。図１３は
スピンドル軸１の断面図である。潤滑剤容器１６の外周
側に発熱体３５を設ける。発熱体３５が発熱することに
より、潤滑剤容器１６に貯蔵された潤滑剤１５の温度を
変えることができる。Next, a third embodiment of the present invention will be described. FIG. 13 is a sectional view of the spindle shaft 1. A heating element 35 is provided on the outer peripheral side of the lubricant container 16. By generating heat from the heating element 35, the temperature of the lubricant 15 stored in the lubricant container 16 can be changed.
【００３７】図１４は潤滑剤供給系１９の断面図である
。潤滑剤供給路１９の外周側に発熱体３６を設ける。
発熱体３６が発熱することにより、潤滑剤供給路１９を
通過する潤滑剤１５の温度を変えることができる。FIG. 14 is a sectional view of the lubricant supply system 19. A heating element 36 is provided on the outer peripheral side of the lubricant supply path 19. By generating heat from the heating element 36, the temperature of the lubricant 15 passing through the lubricant supply path 19 can be changed.
【００３８】図１５はスペーサ９の断面図である。スペ
ーサ９に取り付けた潤滑剤染み出し孔２０の外周部に発
熱体３７を設ける。発熱体３７が発熱することにより、
潤滑剤染み出し孔２０を通過する潤滑剤１５の温度を変
えることができる。FIG. 15 is a sectional view of the spacer 9. A heating element 37 is provided on the outer periphery of the lubricant seepage hole 20 attached to the spacer 9. When the heating element 37 generates heat,
The temperature of the lubricant 15 passing through the lubricant seepage hole 20 can be changed.
【００３９】本実施例では、膜圧センサ１１と温度セン
サ１２の検出量に応じて、潤滑剤容器１６，潤滑剤供給
系１９，スペーサ９の温度を変えることによって、記録
媒体２に潤滑剤１５が供給される前に潤滑剤１５の温度
を変えて、潤滑剤１５の粘度を調節する。潤滑剤１５の
粘度によって、記録媒体２への潤滑剤１５の供給量を調
節することができる。また、潤滑剤容器１６に固体潤滑
剤を貯蔵し、加熱によって固体潤滑剤を液化して記録媒
体２に供給することもできる。In this embodiment, the lubricant 15 is applied to the recording medium 2 by changing the temperatures of the lubricant container 16, lubricant supply system 19, and spacer 9 according to the amounts detected by the film pressure sensor 11 and temperature sensor 12. The viscosity of the lubricant 15 is adjusted by changing the temperature of the lubricant 15 before it is supplied. Depending on the viscosity of the lubricant 15, the amount of the lubricant 15 supplied to the recording medium 2 can be adjusted. Alternatively, a solid lubricant may be stored in the lubricant container 16, and the solid lubricant may be liquefied by heating and supplied to the recording medium 2.
【００４０】次に、本発明の実施例四を示す。図１６は
潤滑剤供給系１９の断面図である。本実施例では、潤滑
剤供給系１９に潤滑剤供給量制御ユニット３８を設け、
記録媒体２への潤滑剤１５の供給量を調節する。Next, a fourth embodiment of the present invention will be described. FIG. 16 is a sectional view of the lubricant supply system 19. In this embodiment, a lubricant supply amount control unit 38 is provided in the lubricant supply system 19,
The amount of lubricant 15 supplied to recording medium 2 is adjusted.
【００４１】図１７はバイモルフを用いた場合の潤滑剤
供給制御ユニット３８である。調節弁３９はバイモルフ
で形成され、発熱体４０で加熱することにより、調節弁
３９が開閉する。発熱体４０の発熱量は、膜圧センサ１
１と温度センサ１２の検出量に応じてフィードバック制
御する。また、調節弁３９は形状記憶合金で形成しても
同様の効果が得られる。FIG. 17 shows the lubricant supply control unit 38 when a bimorph is used. The control valve 39 is made of bimorph, and is opened and closed by heating with a heating element 40. The amount of heat generated by the heating element 40 is measured by the membrane pressure sensor 1.
1 and the amount detected by the temperature sensor 12. Moreover, the same effect can be obtained even if the control valve 39 is made of a shape memory alloy.
【００４２】図１８は圧電素子４１を用いた場合の潤滑
剤供給制御ユニット３８である。圧電素子４１に圧電素
子電極４２を通じて電圧制御装置４３から電圧を与え、
圧電素子４１が体積変形を起こすことによって、弁の開
閉を行う。FIG. 18 shows the lubricant supply control unit 38 using the piezoelectric element 41. Applying a voltage to the piezoelectric element 41 from the voltage control device 43 through the piezoelectric element electrode 42,
The piezoelectric element 41 causes volumetric deformation to open and close the valve.
【００４３】本実施例では、潤滑剤供給量制御ユニット
３８を設けてあるために、実施例一に比べて精度よく記
録媒体２への潤滑剤供給量を制御できる。なお、本実施
例では潤滑剤供給量制御ユニット３８を潤滑剤供給系１
９に設けてあるが、潤滑剤容器１６や潤滑剤染み出し孔
２０に設けてもよい。In this embodiment, since the lubricant supply amount control unit 38 is provided, the amount of lubricant supplied to the recording medium 2 can be controlled more accurately than in the first embodiment. In this embodiment, the lubricant supply amount control unit 38 is connected to the lubricant supply system 1.
9, but it may also be provided in the lubricant container 16 or lubricant seepage hole 20.
【００４４】さらに、本発明の実施例一から実施例四を
適当に組み合わせて更なる磁気記録装置を構成してもよ
い。Further, embodiments 1 to 4 of the present invention may be appropriately combined to constitute a further magnetic recording device.
【００４５】[0045]
【発明の効果】本発明によれば、記録媒体表面に常に潤
滑剤を補給し、かつ潤滑剤の移動速度も制御できるので
、スライダの低浮上化を行った場合でも耐摺動性に優れ
た磁気記録装置を提供することができる。[Effects of the Invention] According to the present invention, lubricant can be constantly supplied to the surface of the recording medium and the moving speed of the lubricant can be controlled, so even when the slider is lowered in flying height, it has excellent sliding resistance. A magnetic recording device can be provided.
【図１】実施例一によるＨＤＡの断面図。FIG. 1 is a cross-sectional view of an HDA according to Example 1.
【図２】実施例一による潤滑剤の供給経路の斜視図。FIG. 2 is a perspective view of a lubricant supply path according to Example 1.
【図３】実施例一による潤滑剤の封印部の断面図。FIG. 3 is a sectional view of a lubricant sealing portion according to Example 1.
【図４】実施例一による潤滑剤供給系の断面図。FIG. 4 is a sectional view of a lubricant supply system according to Example 1.
【図５】実施例一による記録媒体の断面図。FIG. 5 is a cross-sectional view of a recording medium according to Example 1.
【図６】実施例一による記録媒体の斜視図。FIG. 6 is a perspective view of a recording medium according to Example 1.
【図７】記録媒体表面の潤滑剤に作用する力の説明図。FIG. 7 is an explanatory diagram of the force acting on the lubricant on the surface of the recording medium.
【図８】常圧における水の温度と動粘度・表面張力の関
係を示す特性図。FIG. 8 is a characteristic diagram showing the relationship between water temperature, kinematic viscosity, and surface tension at normal pressure.
【図９】常圧における潤滑油の温度と動粘度の関係を示
す特性図。FIG. 9 is a characteristic diagram showing the relationship between lubricating oil temperature and kinematic viscosity at normal pressure.
【図１０】実施例二によるＨＤＡの断面図。FIG. 10 is a cross-sectional view of the HDA according to Example 2.
【図１１】記録媒体二の円板端表面における潤滑剤の様
子を示す説明図。FIG. 11 is an explanatory diagram showing the state of lubricant on the disk end surface of recording medium 2.
【図１２】実施例二によるＨＤＡの冷却機構を示す説明
図。FIG. 12 is an explanatory diagram showing a cooling mechanism of HDA according to Example 2.
【図１３】実施例三によるスピンドル軸の断面図。FIG. 13 is a sectional view of a spindle shaft according to Example 3.
【図１４】実施例三による潤滑剤供給系の断面図。FIG. 14 is a sectional view of a lubricant supply system according to Example 3.
【図１５】実施例三によるスペーサの断面図。FIG. 15 is a sectional view of a spacer according to Example 3.
【図１６】実施例四による潤滑剤供給系の断面図。FIG. 16 is a sectional view of a lubricant supply system according to Example 4.
【図１７】実施例四によるバイモルフを用いた潤滑剤供
給制御ユニットを示す断面図。FIG. 17 is a sectional view showing a lubricant supply control unit using a bimorph according to Example 4.
【図１８】実施例四による圧電素子を用いた潤滑剤供給
制御ユニットを示す断面図。FIG. 18 is a sectional view showing a lubricant supply control unit using a piezoelectric element according to Example 4.
１…スピンドル軸、２…記録媒体、３…スライダ、４…
アクチュエータ、５…ハブ、６…スペーサ、７…スペー
サ押え、８…モータ、９…回転軸受台、１０…スリップ
リング、１１…膜厚センサ、１２…温度センサ、１３…
温度制御装置、１４…密閉容器。1...Spindle axis, 2...Recording medium, 3...Slider, 4...
Actuator, 5... Hub, 6... Spacer, 7... Spacer holder, 8... Motor, 9... Rotating bearing stand, 10... Slip ring, 11... Film thickness sensor, 12... Temperature sensor, 13...
Temperature control device, 14...closed container.
Claims (1)
の円板状記録媒体と、前記円板状記録媒体の記録表面に
対向配置された磁気ヘッドスライダと、前記円板状記録
媒体の相互間の間隔を保持するスペーサと、回転中心に
ある潤滑剤を納めた潤滑剤供給源と、前記潤滑剤供給源
から前記記録媒体の表面に前記潤滑剤を供給する潤滑剤
供給系を備えた磁気記録装置において、前記潤滑剤の供
給量を制御するための潤滑剤の温度調節手段を備えたこ
とを特徴とする磁気記録装置。1. A plurality of rotatable disc-shaped recording media attached to a spindle shaft, a magnetic head slider disposed opposite to a recording surface of the disc-shaped recording media, and a space between the disc-shaped recording media. , a lubricant supply source containing a lubricant at a rotation center, and a lubricant supply system that supplies the lubricant from the lubricant supply source to the surface of the recording medium. A magnetic recording device characterized in that the device comprises a lubricant temperature adjusting means for controlling the supply amount of the lubricant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8812791A JPH04319594A (en) | 1991-04-19 | 1991-04-19 | Magnetic recording device for stably supplying lubricant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8812791A JPH04319594A (en) | 1991-04-19 | 1991-04-19 | Magnetic recording device for stably supplying lubricant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04319594A true JPH04319594A (en) | 1992-11-10 |
Family
ID=13934250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8812791A Pending JPH04319594A (en) | 1991-04-19 | 1991-04-19 | Magnetic recording device for stably supplying lubricant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04319594A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6678113B2 (en) | 2001-03-19 | 2004-01-13 | Hitachi Global Storage Technologies Netherlands B.V. | Device and method for monitoring lubricant within a disk drive |
-
1991
- 1991-04-19 JP JP8812791A patent/JPH04319594A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6678113B2 (en) | 2001-03-19 | 2004-01-13 | Hitachi Global Storage Technologies Netherlands B.V. | Device and method for monitoring lubricant within a disk drive |
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