JP2666924B2 - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JP2666924B2
JP2666924B2 JP58066995A JP6699583A JP2666924B2 JP 2666924 B2 JP2666924 B2 JP 2666924B2 JP 58066995 A JP58066995 A JP 58066995A JP 6699583 A JP6699583 A JP 6699583A JP 2666924 B2 JP2666924 B2 JP 2666924B2
Authority
JP
Japan
Prior art keywords
magnetic disk
magnetic
surface roughness
disk plate
plate
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
Application number
JP58066995A
Other languages
Japanese (ja)
Other versions
JPS59193580A (en
Inventor
茂 竹門
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP58066995A priority Critical patent/JP2666924B2/en
Publication of JPS59193580A publication Critical patent/JPS59193580A/en
Application granted granted Critical
Publication of JP2666924B2 publication Critical patent/JP2666924B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B5/48—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
    • G11B5/60—Fluid-dynamic spacing of heads from record-carriers
    • G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
    • 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

  • Magnetic Record Carriers (AREA)

Description

【発明の詳細な説明】 〔発明の属する技術分野〕 この発明は回転する磁気デイスク板とエアベアリング
部を持つた磁気ヘツドにより構成される磁気デイスク装
置に関する。 〔従来技術の問題点〕 従来磁気デイスク板は磁性膜はデイスク板に磁性体を
塗布することにより製作されてきた。しかし記録密度を
増すため近年磁性膜はメツキあるいはスパツタにより製
作されるようになつた。 メツキあるいはスパツタによる磁気デイスク板では非
運転時にエアベアリング部と磁気デイスク板の間に空気
中の水分が露結し磁気ヘツドと磁気デイスク板が吸着し
やすいという大きな欠点がある。 また、記録密度が高くなると磁性膜からの媒体ノイズ
を無視することができなくなってくる。 〔発明の目的〕 本発明は上述の欠点を解決し、メツキあるいはスパツ
タによる磁気デイスク板においても、特別な吸着防止装
置を用いることなく塗布型磁気デイスク板と同等の磁気
ヘツド−磁気デイスク板の吸着性向を持つた磁気デイス
ク装置を提供することを目的とする。 また、媒体ノイズが少なく高密度記録に適した磁気デ
イスク装置を提供することを目的とする。 ［発明の概要］ 本発明によれば、スパッタ或いはメッキにより全面の
表面粗さを0.02μｍ以下とした磁気ディスク板と、この
磁気ディスク板と対向して配置されるエアベアリング部
を有する磁気ヘッドとを備え、前記磁気ヘッドの前記エ
アベアリング部全面の表面粗さを、前記磁気ディスク板
の表面粗さよりも大きくすることにより、磁気ディスク
板と磁気ヘッドとの吸着現象を防止することが可能とな
る。磁気ヘツドと磁気デイスクの板の間の吸着は対向す
る二面の表面粗さに負相関があることが知られている。
例えば、塗布型デイスク板、メツキあるいはスパツタに
よる磁気デイスク板、ガラス円板とテーパフラツト型磁
気ヘツドの間の吸着現象を比べると、塗布型デイスク板
ではほとんど生じないが、ガラス円板ではきわめてしば
しば生じ、メツキあるいはスパツタによる磁気デイスク
板ではガラス円板ほどでないが比較的吸着現象が生じる
ことが知られている。上記円板の表面粗さは、塗布型で
Rmax＝0.1μｍメツキあるいはスパツタでRmax＝0.02〜
0.04μｍ、ガラス円板ではRmax＝0.002μｍ程度であ
る。一方磁気ヘツドのエアベアリング部の表面粗さはガ
ラス円板と同程度である。 以上の例より吸着現象が対向する二面の表面粗さに負
の相関があることがわかる。メツキあるいはスパツタに
よる磁気デイスク板で吸着現象が生じやすいのは磁気デ
イスク板の表面粗さがよくなつてきたためと言える。 また、磁気デイスク板の記録密度が高くなってくる
と、磁気デイスク板の媒体ノイズが無視できなくなって
くる。つまり、記録波長に対して板の表面粗さが無視で
きなくなると、呼び出し信号にノイズとなって表れるも
のである。信号のS/N比を一定以上確保するためには、
記録密度を高くして記録波長が短くなるほど磁気デイス
ク板の表面粗さを良くする必要がある。ところがこれ
は、前述した磁気ヘッドの吸着現象を生じやすくすると
いう問題点を持っている。 本発明は従来の磁気ヘツドのエアベアリング部と磁気
デイスク板の表面粗さの関係（エアベアリング部の表面
粗さが少ない）を逆転し、エアベアリング部全面の表面
粗さを磁気デイスク板の表面粗さより大きくすることに
よって、磁気ディスク板と磁気ヘッドとの吸着現象を防
止するように構成したことを特徴としている。 〔発明の効果〕 本発明によるとメツキあるいはスパツタによる磁気デ
イスク板による磁気デイスク装置においても、磁気デイ
スク装置内部を乾燥状態に保つような特別な吸着防止装
置を用いなくとも、磁気ヘツド−磁気デイスク板間の吸
着現象を効果的に低減できる。 また、高密度記録化により生じる媒体ノイズによるS/
N比の低下を抑え、高密度記録に適した磁気デイスク装
置を提供できる。 〔発明の実施例〕 第１図に本発明による磁気デイスク装置を示す。１は
磁気デイスク板、２はテーパフラツト型磁気ヘツドであ
る。１の磁気デイスク板はメツキ媒体磁気デイスク板
（表面粗さRmax≒0.02μｍ）を使用し、２の磁気ヘツド
のエアベアリング部全面の表面粗さはRmax＝0.1μｍ程
度とする。第２図に表面粗さRmax≒0.1μｍのエアベア
リング部（テーパ部及びフラット部の双方を含む）全面
を斜線で示す。 もちろん前記ベアリング部全面の表面粗さは上記した
0.1μｍに限定されず、例えば前述したメッキ媒体磁気
ディスク板のようにRmax＝0.02〜0.04μｍであれば、ベ
アリング部全面の表面粗さは0.04μｍ以上であればよ
い。Description: TECHNICAL FIELD The present invention relates to a magnetic disk device including a rotating magnetic disk plate and a magnetic head having an air bearing portion. [Problems of Prior Art] Conventionally, a magnetic film has been manufactured by coating a magnetic material on the magnetic film. However, in order to increase the recording density, the magnetic film has recently been manufactured with a plating or a spatter. A magnetic disk plate made of a metal plate or a sputter has a major disadvantage that moisture in the air is condensed between the air bearing portion and the magnetic disk plate during non-operation, and the magnetic head and the magnetic disk plate are easily adsorbed. Also, as the recording density increases, medium noise from the magnetic film cannot be ignored. [Object of the Invention] The present invention solves the above-mentioned drawbacks, and even in the case of a magnetic disk plate made of a metal plate or a sputter, the magnetic head-magnetic disk plate equivalent to the coating type magnetic disk plate can be adsorbed without using a special adsorption preventing device. It is an object of the present invention to provide a magnetic disk device having a propensity. It is another object of the present invention to provide a magnetic disk device which has low medium noise and is suitable for high-density recording. [Summary of the Invention] According to the present invention, there is provided a magnetic disk plate having a surface roughness of 0.02 μm or less by sputtering or plating, and a magnetic head having an air bearing portion arranged to face the magnetic disk plate. By making the surface roughness of the entire surface of the air bearing portion of the magnetic head larger than the surface roughness of the magnetic disk plate, it is possible to prevent the magnetic disk plate and the magnetic head from attracting. . It is known that the attraction between the magnetic head and the magnetic disk plate has a negative correlation with the surface roughness of the two opposing surfaces.
For example, when comparing the adsorption phenomena between a coated disk plate, a magnetic disk plate with a plating or a sputter, and a glass disk and a tapered flat magnetic head, it hardly occurs in the coated disk plate, but occurs very often in the glass disk. It is known that a magnetic disk plate made of a metal plate or a sputter causes a relatively large adsorption phenomenon, though not as much as a glass disk. The surface roughness of the above disk is
Rmax = 0.1μm with a sprocket or Rmax = 0.02 ～
0.04 μm, and Rmax = 0.002 μm for a glass disk. On the other hand, the surface roughness of the air bearing portion of the magnetic head is almost the same as that of a glass disk. It can be seen from the above example that the adsorption phenomenon has a negative correlation with the surface roughness of the two opposing surfaces. It can be said that the reason why the adsorption phenomenon is likely to occur on the magnetic disk plate due to plating or spattering is that the surface roughness of the magnetic disk plate has improved. Further, as the recording density of the magnetic disk becomes higher, the medium noise of the magnetic disk cannot be ignored. That is, if the surface roughness of the plate cannot be ignored with respect to the recording wavelength, it appears as noise in the calling signal. In order to maintain the signal S / N ratio above a certain level,
The higher the recording density and the shorter the recording wavelength, the better the surface roughness of the magnetic disk plate. However, this has a problem that the above-mentioned magnetic head attraction phenomenon is easily caused. The present invention reverses the conventional relationship between the surface roughness of the air bearing portion of the magnetic head and the magnetic disk plate (the surface roughness of the air bearing portion is small), so that the surface roughness of the entire air bearing portion is changed to the surface of the magnetic disk plate. By making the roughness larger than the roughness, the magnetic disk head and the magnetic head are prevented from being attracted to each other. [Effect of the Invention] According to the present invention, even in a magnetic disk device using a magnetic disk plate formed by plating or sputtering, a magnetic head-magnetic disk plate can be used without using a special adsorption prevention device for keeping the inside of the magnetic disk device dry. The adsorption phenomenon between the two can be effectively reduced. Also, S / S due to medium noise caused by high density recording
A magnetic disk device suitable for high-density recording can be provided while suppressing a decrease in the N ratio. FIG. 1 shows a magnetic disk device according to the present invention. 1 is a magnetic disk plate and 2 is a tapered flat type magnetic head. The magnetic disk of No. 1 is a magnetic disk for a medium to be used (surface roughness Rmax.apprxeq.0.02 .mu.m), and the surface roughness of the air bearing surface of the magnetic head of No. 2 is about Rmax = 0.1 .mu.m. In FIG. 2, the entire surface of the air bearing portion (including both the tapered portion and the flat portion) having a surface roughness Rmax ≒ 0.1 μm is indicated by oblique lines. Of course, the surface roughness of the bearing
The surface roughness of the entire surface of the bearing portion is not limited to 0.1 μm, and may be 0.04 μm or more if Rmax = 0.02 to 0.04 μm as in the plating medium magnetic disk plate described above.

【図面の簡単な説明】 第１図は本発明を説明するための磁気デイスク装置を示
す概略図、第２図は本装置に使用する磁気ヘツド一例を
示す斜視図である。 １……磁気デイスク板、２……磁気ヘツドBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a magnetic disk device for explaining the present invention, and FIG. 2 is a perspective view showing an example of a magnetic head used in the present device. 1 ... magnetic disk plate, 2 ... magnetic head

Claims (1)

(57)【特許請求の範囲】 １．スパッタ或いはメッキにより全面の表面粗さを0.02
μｍ以下とした磁気ディスク板と、 この磁気ディスク板と対向して配置されるエアベアリン
グ部を有する磁気ヘッドとを備え、 前記磁気ヘッドの前記エアベアリング部全面の表面粗さ
を、前記磁気ディスク板の表面粗さよりも大きくしたこ
とを特徴とする磁気ディスク装置。(57) [Claims] Surface roughness of 0.02 by sputtering or plating
μm or less, and a magnetic head having an air bearing portion disposed opposite to the magnetic disk plate, and the surface roughness of the entire air bearing portion of the magnetic head is reduced by the magnetic disk plate. A magnetic disk drive characterized by having a surface roughness greater than that of the magnetic disk drive.
JP58066995A 1983-04-18 1983-04-18 Magnetic disk device Expired - Lifetime JP2666924B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58066995A JP2666924B2 (en) 1983-04-18 1983-04-18 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58066995A JP2666924B2 (en) 1983-04-18 1983-04-18 Magnetic disk device

Publications (2)

Publication Number Publication Date
JPS59193580A JPS59193580A (en) 1984-11-02
JP2666924B2 true JP2666924B2 (en) 1997-10-22

Family

ID=13332092

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58066995A Expired - Lifetime JP2666924B2 (en) 1983-04-18 1983-04-18 Magnetic disk device

Country Status (1)

Country Link
JP (1) JP2666924B2 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833556A (en) * 1987-12-22 1989-05-23 Eastman Kodak Company Low drag stabilizer device for stabilizing the interface between a transducer and a moving medium
JPH0366079A (en) * 1989-08-04 1991-03-20 Matsushita Electric Ind Co Ltd Flying head for magneto-optical disk
JP2948632B2 (en) * 1990-01-19 1999-09-13 シャープ株式会社 Magneto-optical recorder
GB2342764B (en) 1997-06-27 2002-02-27 Seagate Technology Slider for disc storage system
JP4392986B2 (en) * 1997-08-15 2010-01-06 シーゲイト テクノロジー エルエルシー Disk storage system
US6487043B1 (en) 1997-12-04 2002-11-26 Seagate Technology Llc Cross texture head disc interface
US6003364A (en) * 1998-03-19 1999-12-21 Seagate Technology, Inc. Glide head for testing a disc surface
US6369900B1 (en) 1998-04-16 2002-04-09 Seagate Technology Llc Glide head with features on its air bearing surface for improved fly height measurement
US6899456B2 (en) 1998-04-16 2005-05-31 Seagate Technology Llc Glide head for asperity detection
US6381090B1 (en) 1998-05-21 2002-04-30 Komag, Incorporated Hard disk drive head-media system having reduced stiction and low fly height
US6683754B2 (en) 1998-05-21 2004-01-27 Komag, Inc. Hard disk drive head-media system having reduced stiction and low fly height
US6603639B1 (en) 1998-07-21 2003-08-05 Seagate Technology Llc Slider for disc storage system
US6459547B1 (en) 1998-12-09 2002-10-01 Seagate Technology Llc Slider with pads and textured landing zone for disc storage system
US6536265B1 (en) 1999-12-02 2003-03-25 Seagate Technology Llc Micro-textured glide sliders for super-smooth media
US6619105B1 (en) * 2000-04-12 2003-09-16 Seagate Technology Llc Glide head with anti-collapsing protection feature
WO2002033698A1 (en) 2000-10-13 2002-04-25 Seagate Technology Llc Disc drive slider having textured pads

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5296012A (en) * 1976-02-09 1977-08-12 Nec Corp Floating magnetic head of contact start and stop type
JPS5423517A (en) * 1977-07-25 1979-02-22 Nippon Telegr & Teleph Corp <Ntt> Floating head slider
JPS56107363A (en) * 1980-01-31 1981-08-26 Nec Corp Floating type magnetic head
JPS57167135A (en) * 1981-04-03 1982-10-14 Nec Corp Magnetic disc

Also Published As

Publication number Publication date
JPS59193580A (en) 1984-11-02

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