CN1202259A - 磁记录装置 - Google Patents
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Abstract
本发明涉及改进的高性能磁记录装置,该装置具有以低表面能薄膜覆盖的滑板(10)的拖动面(9)。
Description
本发明涉及具有改进的滑板和改进的磁记录过程的改进的磁记录装置。
当前数字式磁记录数据存储工业的增长率显示记录密度以每年60%增长。为了继续保持这一增长曲线,正迫使记录业界在磁记录装置的设计中作出若干重要改变。用于数据存储的数字式磁记录装置包括薄膜磁记录盘和磁头或传感器,该传感器沿着旋转的磁盘表面或在其上方运动以便读写磁盘上的信息。先进的高面密度,薄膜磁记录盘包括最好有双带纹理表面的硬质基片,诸如钴基金属合金之类的磁性层,非晶形碳保护层,以及诸如分布在碳外罩上的全氟聚醚之类的润滑层。磁盘基片的双带纹理由用来读写数据的磁盘区域上高度抛光的表面,及在记录装置不使用时用于磁头停靠的磁盘区域上有纹理的表面组成。“数据带”高度抛光的表面功能为:a)使磁盘表面与磁头之间的相互作用最小,以及b)降低读写操作期间遇到的出错数。在有纹理的“停靠带”不存储数据,它的存在是希望消除外存启动时的静态阻力。静态阻力是停靠后静止的磁记录头反抗例如沿磁盘表面移动这样的运动的趋向。高的静态阻力可能导致磁头或磁盘的机械故障。
传感器设置在有气浮面的托板或称滑板上,在邻接的磁盘数据面工作期间该滑板由旋转着的磁盘所产生的气垫支撑。由于记录密度对磁头记录元件与磁盘的磁性层之间分开的距离呈指数型相关,故对于高面密度记录就需要较低的飞行高度,并且诸如在U.S.Patent 4,894,740中所描述那样,可采用应用负气浮的磁头来达到高面密度。然而,较低的飞行高度可能引起磁头与磁盘在正常飞行期间相互作用的增加。
记录装置还包括与托板连接的定位传动器,用于在读写操作时使磁头运动到磁盘上所希望的位置。
1994年4月14日公开的Gitis的PCT申请US9309460透露了,在操作期间,磁头和磁盘暴露在诸如灰尘和碳微粒的污物中,这些碳微粒是通过磁头/磁盘的接触从磁盘碳保护层擦下来的。这些微粒会在滑板上积累,并可能最终导致在记录装置操作期间磁头碰撞。Gitis提出,在接触的记录装置滑板的耐磨垫片和垂直侧上蒸汽沉积低表面能聚合物,以便尽量减少微粒在滑板上的积累。
通常的非接触磁记录装置工作在大约3600 RPM到大约5400 RPM的旋转速度,并且飞行高度为80到100nm。已经发现,当高面密度记录装置以例如7200这样更高速度和更低的飞行高度工作时,遇到静态阻力问题。然而,对于高面密度记录希望通过增加磁盘的转速来降低数据存取时间,而又不会遇到静态阻力问题。在技术上仍然需要能够以更高转速工作而没有静态阻力的高面密度磁记录装置。
本发明的磁记录装置包括:(a)一个磁盘;(b)一个与磁盘相关联使磁盘旋转的可操作的电动机;(c)支撑在气浮托板上用于以磁性向磁盘读出数据或以磁性从其写入数据的磁头;托板的拖动面由最好具有表面能小于25尔格/cm2的薄膜层覆盖,该层在积聚的污物即碳氢化合物中是不溶混的;以及(d)与磁头托板连接用于使磁头跨越磁盘运动的传动器。
托板上的薄层最好包含含氟聚合物,这种聚合物最好通过物理或化学吸附、紫外线照射、加热在表面上被稳定,或被光束沉积到托板的拖动面上,例如通过离子光束或等离子聚合或喷镀。
托板的拖动面上薄层敷层消除了与高性能、高密度磁记录装置相关的静态阻力问题。
电动机使磁盘最好以大于7000rpm的转速及75nm的飞行高度旋转。薄膜最好在滑板的蚀刻槽中形成。
本发明还涉及以磁记录装置用于磁性地读取或写入的过程,该过程包括步骤:(a)使磁记录盘旋转;以及(b)使滑板上的磁记录头气动悬浮以便向磁盘通过磁性读取数据或从磁盘写入数据,滑板的拖动面具有在积聚的污物中不溶混且其表面能小于25尔格/cm2的薄膜。
现在将参照附图仅通过示例的方式对本发明进行说明,其中:
图1是磁记录盘驱动器的剖视图;
图2是磁记录盘驱动器的顶视图;及
图3是磁记录头托板的底视图。
本发明涉及用于通过磁性读写数据的改进的高性能数字式磁记录装置。
参见图1和2,其中示出本发明的磁记录盘驱动器。磁记录盘2由带有轮毂6的驱动电动机4驱转,该轮毂配置在驱动电动机上。磁盘包括基片,金属磁性层,碳层和聚合物润滑层,例如全氟聚醚。希望磁盘上润滑层的厚度大约为5到25
读/写头或称传感器8是在托板或滑板10的拖动末端形成的。适用的滑板是正的或负的气浮滑板。在U.S.Patent 4,894,740和5,438,467中透露了适用的负气浮滑板,该透露在此结合作为参考。滑板10具有拖动面9。磁头8可以是感应式的读写传感器或带有磁阻读传感器的感应式写传感器。滑板10借助于刚性臂14和悬臂16连接到传动器12。悬臂16提供了使滑板10压向记录盘2的表面的偏置力。参见图3,其中示出适用的负气浮滑板的底视图,该滑板带有外轨道18和内轨道19以及作为在内外轨道之间形成的凹陷的蚀刻槽20。
在磁盘驱动器工作期间,驱动电动机4使磁盘2以恒速在箭头22所指的方向旋转,一般为线性或旋转动圈电动机的传动器12使滑板10一般径向跨越磁盘2的表面以小于75nm的高度运动,使得读/写头可以访问磁盘2上不同数据磁道。
已经发现了高性能磁记录装置静态阻力问题的根源。首先,记录装置的高转速(例如7000 RPM或更高)摩擦热增加,结果导致主轴轴承、磁盘电动机和传动器轴承及线圈中使用的碳氢化合物润滑剂蒸汽压力的增加。进而,高转速引起旋转部件和滑板之间温度梯度的增加。其次,较低的飞行高度增强了滑板和磁盘之间的接触,这增加了污物转移的机会。这些因素与空气压缩及因增加飞行速度所致托板经受的空气流的增加的共同作用,引起了在连续操作之后诸如碳氢化合物、水分、润滑剂等等液体污物在滑板的拖动面上和蚀刻槽中凝聚。当滑板停在磁盘面上时,这些细滴桥接到磁盘而造成对滑板显著的静态阻力。
位于滑板10的拖动面及滑板10的蚀刻槽20上的低表面能薄膜把高性能磁记录装置操作期间在滑板上可凝聚污物的积聚降低到最小,从而消除了静态阻力问题。磁头8的拖动面整个部分和滑板10的蚀刻槽20最好敷以低表面能薄膜以尽量减少操作期间在滑板上污物的凝聚。
低表面能薄膜最好包含氟有机材料,最好是含氟聚合物。这里所使用的含氟聚合物是指含氟的有机聚合物。敷在滑板上的薄膜最好有几个特性。薄膜的表面能要小于25尔格/cm2,最好小于20尔格/cm2,并更好是小于15尔格/cm2以便尽量减少可凝聚污物的积聚。含氟聚合物薄膜的玻璃转变温度(Tg)大于25℃,最好大于50℃。薄膜在碳氢化合物润滑剂中是不溶的并在沉积到磁盘上的的润滑剂中是不溶混的。滑板上的薄膜层厚度将小于100。最好小于50并更好是小于20,并且薄膜将是连续的,在滑板的拖动边和每一蚀刻槽上没有空隙。用于本发明较好的含氟聚合物类型包括氟化丙烯酸盐/甲基丙烯酸酯,聚氟化烷,及在表面包含大量CF3和CF2团的聚合物。较好的具体的含氟聚合物是聚四氟乙烯和聚六氟丙烯。其他适用的含氟聚合物是业内专业人士所知道的。
含氟聚合物可通过各种已知的技术工艺敷到滑板的拖动面上。例如,可使用浸渍工艺,蒸汽转移工艺或喷镀工艺把含氟聚合物敷到滑板上。在浸渍工艺中,例如由3M公司制成的Fluorad FC 722牌号的聚(氟烷基异丁烯酸盐)这样的低表面能含氟聚合物,以400-700ppm的浓度溶解在例如全氟己烷的碳氟化合物溶剂中。由悬挂滑板组成的传动器装到支架上并浸渍到含有含氟聚合物溶液中。调节浸渍角度和拉动的速度以获得理想的厚度。
在另一实施例中,诸如氟化长链极性分子这样的含氟有机材料,例如氟化脂肪酸,通过浸渍被自动地吸收到滑板表面。分子在表面形成密集包裹的一单层。分子在极性团贴到表面处自积聚,而有例如CF2和CF3的氟化物团的其余分子远离表面。
在另一实施例中,含氟聚合物可借助于沉积方法施加到滑板的拖动表面。磁头的含氟聚合物的处理,使用诸如离子束沉积、等离子聚合法或溅涂法等已知的薄膜处理技术在真空中进行。可使用等离子聚合技术实现含氟聚合物向磁记录头的真空沉积。在这一工艺中,或者是滑板附着在悬挂件上,滑板自由,滑板排先于各个滑板形成之前被涂敷,或者可在形成滑板排之前涂敷薄片。所需要的含氟聚合物的氟化先质被引入抽真空到标称为1 mtorr(毫乇)压力的真空室。例如,六氟丙烷,六氟丙烯,氩气分别以250 SCCM,35 SCCM和900 SCCM的流速流入等离子真空室。真空室压力设定在200 mtorr,并使用17kHz和750W的RF电能促使等离子的形成。沉积进行达30-60秒。在这些条件下,在滑板的气浮面上形成25埃的含氟聚合物,并在磁头的拖动端/蚀刻槽上形成40埃的含氟聚合物。用作为这种工艺中的先质的其他成膜含氟有机物是业内专业人员所知道的。
这一工艺的另一实施例还涉及在滑板表面形成单层含氟有机物。这一工艺中,氟化碳气体诸如全氟化碳C1-C10气体,例如聚三氟甲烷,聚六氟乙烷,聚八氟丙烷等,引入等离子室并产生RF等离子。在这一实施例中,氟化碳先质作为原料以产生一般形式CxFy的氟化有机碎片,这些碎片附着在磁记录头的表面。其表面能通常为15尔格/cm2的CF3团是较好附着物类型,然而,CF2团(20尔格/cm2)也是所希望的。
也可以使用从低自由能表面材料组成的靶的RF喷镀法在滑板表面形成含氟聚合物,例如可以使用表面能20尔格/cm2的聚四氟乙烯(特氟隆)。一般的惰性气体诸如氩气用来产生喷镀工艺所必须的等离子。这种气体以10毫乇等级的压力被引入真空腔。向真空腔提供RF电能引起惰性喷镀气体的离子化。然后这些惰性气体被加速向低表面能靶而引起靶的喷镀。然后被喷射的靶的碎片收集到所希望的磁记录头的表面上。这一工艺可在悬挂的磁头,自由磁头上进行,或可在成排的水平或薄片水平进行。
这一实施例的一种变形包括使用氟化气体来产生喷镀所必须的等离子。在这一工艺中,适当地选择含氟有机物,例如四氟甲烷烯,六氟乙烷等等以期把更多的CF3结合到沉积的聚合物薄膜中,从而降低整体的表面能,从通常的20尔格/cm2降到15尔格/cm2。
本发明还涉及以磁记录装置进行磁记录读写的过程。该过程一个优选的实施例包括以下步骤:
(a)以大于7000 RPM的转速使磁记录盘旋转;
(b)使磁记录头以小于75nm的飞行高度贴近旋转的磁盘气动悬浮,以便通过磁性向磁盘读取或从其写入数据,磁头的拖动面具有小于25尔格/cm2低表面能的薄膜并在可凝聚的污物中不溶混。
飞行高度最好小于70nm,最好从大约55nm到大约70nm;更好是从大约55nm到65nm,并最好为大约60nm。
以下的例子是本发明的详细描述。该详细描述属于以上更为一般描述的本发明的范围并作为示例。提出示例仅仅是为了说明之目的,并不是要限制本发明的范围。
例子
滑板
本发明的滑板的拖动面通过以下工艺敷以低表面能的含氟聚合物。
制备在溶剂中包含聚(氟烷基异丁烯酸盐)(500ppm重量)的溶液。滑板完全浸渍在溶液中,以1mm/秒的拉动速度取出。滑板从液体取出放入溶剂蒸汽。
试验装置
试验器包括2个标准的可以7200 PRM旋转的磁盘主轴。每一磁盘装两个滑板(顶面和底面),在磁盘的OD处定位(大约40mm的半径)。对悬挂安装的压缩空气允许向/从磁盘安装/卸下滑板。
主轴由一胶质玻璃覆盖罩,该胶质玻璃罩包含一开口以便允许空气排出。利用直径10mm长约1m的塑料导管从一外部源向胶质玻璃罩注入富含碳氢化合物的稳定的空气流。
这一HC源是放置在一加热板上的铝质盒子。温度是可调节的。诸如轴承油脂之类的碳氢化合物加到铝质盒子的内部的底板(′源板′)。然后盒子被封闭并一般加热到70℃,且一般为1l/min的可调节的气流通过铝质盒子供给胶质玻璃罩和环绕上述主轴。
试验的操作
把清洁的磁盘安装到主轴上且把滑板加到磁盘上。胶质玻璃罩覆盖在主轴上。向HC源装入适当的油脂,启动加热器和空气流以便在胶质玻璃罩内提供富含碳氢化合物的大气。各个磁头/磁盘对以7200 RPM转动12小时。
结果
拖动面上带有含氟聚合物的滑板 2-7gm静态阻力
拖动面上不带含氟聚合物的滑板 20-40gm静态阻力
虽然对本发明就特定的实施例进行了说明,这些实施例的细节并不构成对本发明的限制,因为在不背离其实质和范围的情形下显然可获得各种实施例、变化和修改,并应当理解,这些等价的实施例应当包含在本发明的范围之内。
Claims (10)
1.用于对磁盘通过磁性读写数据的一种磁记录装置,所述装置包括:
(a)一个磁盘(2);
(b)支撑在气浮滑板(10)上用于以磁性从磁盘读出数据或以磁性向磁盘写入数据的磁头(8);滑板的拖动面(9)由在积聚的污物中不溶混的并具有表面能小于25尔格/cm2的薄膜覆盖;
(c)一个可操作使磁盘(2)旋转的电动机(4);以及
(d)与滑板连接用于使磁头跨越磁盘运动的传动器(12)。
2.权利要求1的装置,其中薄膜包含含氟聚合物。
3.权利要求1的装置,其中薄膜还配置在所述滑板的蚀刻槽(20)中。
4.权利要求1的装置,其中所述电动机(4)可操作以便以大于7000rpm的转速驱转磁盘。
5.权利要求4的装置,其中磁头(8)的飞行高度小于75nm。
6.用于通过磁性以磁记录装置进行读或写的过程,该过程包括以下步骤:
(a)使磁记录盘(2)旋转;以及
(b)使滑板(10)上的磁记录头(8)气动悬浮以便从磁盘(2)通过磁性读取数据或向磁盘(2)写入数据,滑板(10)的拖动面(9)具有在积聚的污物中不溶混且其表面能小于25尔格/cm2的薄膜。
7.权利要求6的装置,其中薄膜包含含氟聚合物。
8.权利要求6的装置,其中薄膜还配置在所述滑板的蚀刻槽(20)中。
9.权利要求6的装置,其中所述电动机(4)可操作以便以大于7000rpm的转速驱转磁盘。
10.权利要求9的装置,其中磁头(8)的飞行高度小于75nm。
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US08/570,050 | 1995-12-11 | ||
US08/570,050 US5661618A (en) | 1995-12-11 | 1995-12-11 | Magnetic recording device having a improved slider |
Publications (2)
Publication Number | Publication Date |
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CN1202259A true CN1202259A (zh) | 1998-12-16 |
CN1093672C CN1093672C (zh) | 2002-10-30 |
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CN96198400A Expired - Fee Related CN1093672C (zh) | 1995-12-11 | 1996-11-18 | 磁读写装置 |
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EP (1) | EP0868719B1 (zh) |
JP (1) | JPH11506247A (zh) |
KR (1) | KR19990067430A (zh) |
CN (1) | CN1093672C (zh) |
DE (1) | DE69603978T2 (zh) |
MY (1) | MY112680A (zh) |
TW (1) | TW328128B (zh) |
WO (1) | WO1997022119A1 (zh) |
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- 1996-11-18 DE DE69603978T patent/DE69603978T2/de not_active Expired - Fee Related
- 1996-11-18 CN CN96198400A patent/CN1093672C/zh not_active Expired - Fee Related
- 1996-11-18 EP EP96938360A patent/EP0868719B1/en not_active Expired - Lifetime
- 1996-11-18 WO PCT/GB1996/002805 patent/WO1997022119A1/en not_active Application Discontinuation
- 1996-11-18 KR KR1019980703441A patent/KR19990067430A/ko not_active Application Discontinuation
- 1996-11-19 MY MYPI96004800A patent/MY112680A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111627466A (zh) * | 2019-02-28 | 2020-09-04 | 株式会社东芝 | 磁记录介质及磁记录再现装置 |
CN111785304A (zh) * | 2020-06-23 | 2020-10-16 | 厦门市美亚柏科信息股份有限公司 | 一种希捷硬盘内圈划伤数据恢复方法 |
Also Published As
Publication number | Publication date |
---|---|
WO1997022119A1 (en) | 1997-06-19 |
KR19990067430A (ko) | 1999-08-16 |
EP0868719A1 (en) | 1998-10-07 |
MY112680A (en) | 2001-07-31 |
US5661618A (en) | 1997-08-26 |
TW328128B (en) | 1998-03-11 |
JPH11506247A (ja) | 1999-06-02 |
DE69603978T2 (de) | 2000-03-30 |
CN1093672C (zh) | 2002-10-30 |
DE69603978D1 (de) | 1999-09-30 |
EP0868719B1 (en) | 1999-08-25 |
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