CN1825433B - 磁头悬挂装置 - Google Patents
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- 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
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- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
Abstract
本发明提供磁头悬挂装置,其不使用静电清除器而可防止读取元件的静电释放损坏并可确保写入信号的频率特性,具有:承载梁,用于承载将数据写入硬盘和从硬盘读取数据的磁头;由导电性薄板制成的挠性件,其设置在所述承载梁上并用于支承所述磁头;写入线路和读取线路,所述写入线路和读取线路的一端与所述磁头连接,所述写入线路和读取线路的另一端沿磁头悬挂装置的基体延伸,所述写入线路和读取线路形成在由挠性树脂制成并形成在所述挠性件上的绝缘基层上,所述绝缘基层具有孔以部分地露出所述挠性件;以及涂层,其由导电性挠性树脂制成并延伸到所述挠性件的表明以释放静电,所述涂层形成在所述读取线路之上而不是形成在写入线路之上并延伸到所述孔,在该孔中,所述涂层覆盖所述挠性件的表面并接地。
Description
技术领域
本发明涉及用于安装于信息处理设备例如计算机中的硬盘驱动器的磁头悬挂装置。
背景技术
硬盘驱动器(HDD)使用磁头悬挂装置,该磁头悬挂装置用于悬置向磁盘写入数据和从磁盘读取数据的磁头。为向磁头传输写入信号和从磁头传输读取信号,有线路与磁头连接。线路布置于由挠性树脂制造且形成于弯曲部分上的绝缘基层,弯曲部分是磁头悬挂装置的一部分且由弹性不锈钢薄板制成。线路由挠性树脂制的绝缘覆盖层覆盖。
当将弯曲部分组装到磁头悬挂装置中时,绝缘覆盖层的表面可与其他部分例如夹子或工具以积聚静电。该静电传输到绝缘覆盖层下的线路。如果磁头悬挂装置的磁头接触工具或夹具,亦或磁头悬挂装置的滑块垫和挠性件垫在GBB(金球焊接)和SBB(接线柱金球焊接)处理时相互接触,则线路中积聚的静电将移动到磁头从而使磁头的读取元件失效或损坏。
最近的硬盘驱动器使用MR(磁阻)磁头、GMR(高磁阻)磁头以提高读取灵敏度。这些MR和GMR磁头对静电敏感且需要防静电释放损坏措施。
与读取元件不同,磁头的写入元件能抵抗静电释放是因为其通常是感应磁换能器。写入元件需要提供高频信号和使信号上升陡峭以提高写入传输速度的措施而不是防静电释放损坏措施,
简单地使用导电材料来防止静电释放损坏将导致降低写入信号的频率和使写入性能变差。
一种用于防止静电释放损坏的措施是使用粒子发生器(静电清除器)。如日本未审查专利申请出版物No.9-282624和Shoji Natori(日立计算机装备)“GMR磁头的ESD评估”2003年1月31日,技术委员会,ESD控制集团所公开,粒子发生器需要特别的设施和额外的离子平衡工序,从而增加了成本。
发明内容
本发明的一个目的是提供不使用静电清除器而可防止读取元件的静电释放损坏并能确保写入信号的频率特性的磁头悬挂装置。
为实现该目的,本发明的一个方面提供了磁头悬挂装置,其具有涂有导电性挠性树脂以释放静电的读取线路。涂层延伸到磁头悬挂装置的挠性件的表面。
读取线路上的涂层逐渐从读取线路一侧释放静电到夹具或接地的设备,从而防止线路和布置于磁头悬挂装置的滑块上的读取元件之间的静电释放并使读取元件免于静电释放损坏。写入线路上的静电对写入元件没影响。写入元件可抗静电,因此,不需防静电释放损坏措施。涂于读取线路上的导电性挠性树脂不使经过写入线路的写入信号的频率特性变差。也就是,树脂涂层不使线路性能变差。本发明的该方面可免除静电去除器的设备成本,省去离子平衡工序,减小磁头悬挂装置的总成本。
具体地,本发明提供一种磁头悬挂装置,具有:
承载梁,用于承载将数据写入硬盘和从硬盘读取数据的磁头;
由导电性薄板制成的挠性件,其设置在所述承载梁上并用于支承所述磁头;
写入线路和读取线路,所述写入线路和读取线路的一端与所述磁头连接,所述写入线路和读取线路的另一端沿磁头悬挂装置的基体延伸,所述写入线路和读取线路形成在由挠性树脂制成并形成在所述挠性件上的绝缘基层上,所述绝缘基层具有孔以部分地露出所述挠性件;以及
涂层,其由导电性挠性树脂制成并延伸到所述挠性件的表明以释放静电,所述涂层形成在所述读取线路之上而不是形成在写入线路之上并延伸到所述孔,在该孔中,所述涂层覆盖所述挠性件的表面并接地。
附图说明
图1是表示根据本发明实施例的磁头悬挂装置的俯视图。
图2是表示图1中磁头悬挂装置的挠性件的俯视图。
图3是表示图2中部分III的放大俯视图。
图4是沿图3中IV-IV线的剖视图。
图5是沿图3中V-V线的剖视图。
图6是沿图3中VI-VI线的剖视图。
具体实施方式
现说明根据本发明的实施例的磁头悬挂装置。该实施例在读取一侧施以防静电释放损坏措施以不使用静电去除器而可防止磁头读取元件的静电释放损坏,同时,确保写入信号的频率特性。
(磁头悬挂装置的大体结构)
图1是表示根据实施例的磁头悬挂装置的俯视图。
在图1中,在图1中,磁头悬挂装置1具有承载梁3、基体5和挠性件7。
承载梁3包括刚性部分9和弹性部分11以装载磁头21。刚性部分9由例如不锈钢制造且相对较厚。刚性部分9的厚度约为例如100μm。
弹性部分11与刚性部分9分离且由例如弹性薄不锈钢轧制板制造。弹性部分11的刚度是精确的且低于刚性部分9的刚度。弹性部分11的厚度约为例如40μm。弹性部分11的前端通过例如激光焊接固定于刚性部分9的后端。弹性部分11的后端与加强板13合为一体。
基体5具有基板15,基板15由加强板13覆盖并通过例如激光焊接固定于加强板13上。基板15由加强板13加强以形成基体5。基体5连接到支架的臂上并绕心轴转动。
挠性件7具有由例如厚度约30μm弹性薄不锈钢轧制板(SST)制造的导电薄板。在挠性件7上,在电绝缘层上形成有线路图案19。挠性件7通过例如激光焊接固定于刚性部分9。线路图案19的一侧端部电连接于磁头21的写入终端23和读取终端25。线路图案19的另一侧端部沿基体5延伸。
挠性件7具有由磁头21支撑的悬臂榫27。榫27具有写入滑块和读取滑块。写入滑块具有与写入终端23对应且与写入元件连接的终端。读取滑块具有与读取终端25对应且与读取元件连接的终端。
写入元件是例如标准感应磁换能器。读取元件是高灵敏读取元件例如MR(磁阻)元件、GMR(高磁阻)元件、TuMR(可调磁阻)元件。
(涂覆)
图2是表示具有线路图案19的挠性件7的俯视图,图3是表示图2中部分III的放大俯视图,图4是沿图3中IV-IV线的剖视图,图5是沿图3中V-V线的剖视图,图6是沿图3中VI-VI线的剖视图。
在图2到6中,线路图案19包括写入线路(写入1、写入2)29和读取线路(读取1、读取2)31,其形成于绝缘基层35上。绝缘基层35由挠性树脂制成且形成于挠性件7上。
绝缘基层35的挠性树脂是聚酰亚胺且具有约10μm的层厚和约1014Ω/sq的表面电阻率。通过该高电阻率,基层35提供合适的绝缘性能。基层35在适当位置上具有孔37和39以部分地露出挠性件7。
绝缘基层35上的读取线路31充分涂有在从绝缘基层35升起的方向上具有约20μm层厚的绝缘覆盖层41。覆盖层41覆盖读取线路31的表面以使读取线路31绝缘并对其保护。与基层35一样,覆盖层41具有约1014Ω/sq的表面电阻率。通过该高电阻率,覆盖层41提供合适的绝缘性能。
读取线路31上使用掩模形成了涂层43和45。涂层43和45由导电性挠性树脂制造且延伸到挠性件7的表面以释放静电。涂层43和45约儿微米的层厚和104到1011Ω/sq的表面电阻率。该表面电阻率是导电与绝缘之间的中间值。也就是,涂层43和45在电路运转方面充分绝缘且对于静电充分导电。
涂层43覆盖绝缘覆盖层41的表面49并延伸到孔37和39。在孔37和39中,涂层43覆盖挠性件7的表面47并接地。
涂层45覆盖读取线路31的表面51并延伸到孔39。在孔39中,涂层45覆盖挠性件7的表面47并接地。
绝缘基层35使写入线路29和读取线路31与挠性件7绝缘。覆盖层41使读取线路31绝缘并对其保护。
(静电释放)
在挠性件7的组装工作中,涂层43可以与其它部分例如夹子或工具摩擦以积聚静电。涂层43中的静电经涂层43移动到孔37和39中的挠性件7的表面47。因此,静电释放到与挠性件7接触的工具或夹具等上。
如果读取线路31经绝缘覆盖层41积聚静电,则静电经涂层45移动到孔39中的挠性件7的表面47上。因此,静电释放到与挠性件7接触的工具或夹具等上。
即使在组装工作中滑块垫接触读取终端25,也没有静电在读取线路31和滑块之间传输。也就是,读取元件上将不出现静电导致的损坏或恶化。结果,可以使用读取数据高灵敏元件例如MR元件、GMR元件或TuMR元件作为读取元件。
根据实施例,磁头悬挂装置1自身用作静电清除器以不使用粒子发生器地去除静电。因此,实施例可减少设备成本和制造工序数量,从而降低磁头悬挂装置的总成本。
导电涂层43和45不在写入线路29上,因而不损害写入信号的频率特性。因此,实施例可确保写入性能。
Claims (2)
1.一种磁头悬挂装置,具有:
承载梁,用于承载将数据写入硬盘和从硬盘读取数据的磁头;
由导电性薄板制成的挠性件,其设置在所述承载梁上并用于支承所述磁头;
写入线路和读取线路,所述写入线路和读取线路的一端与所述磁头连接,所述写入线路和读取线路的另一端沿磁头悬挂装置的基体延伸,所述写入线路和读取线路形成在由挠性树脂制成并形成在所述挠性件上的绝缘基层上,所述绝缘基层具有第一孔和第二孔以部分地露出所述挠性件;以及
涂层,其由导电性挠性树脂制成并延伸到所述挠性件的表面以释放静电,所述涂层覆盖绝缘覆盖层的表面并延伸到所述第一孔和第二孔,所述绝缘覆盖层覆盖在读取线路的与所述涂层相对应的表面上,在所述第一孔和第二孔中,所述涂层覆盖所述挠性件的表面并接地,并且所述涂层覆盖所述读取线路的表面并延伸到所述第二孔,在所述第二孔中,所述涂层覆盖所述挠性件的表面并接地。
2.根据权利要求1所述的磁头悬挂装置,其特征在于,所述涂层具有的表面电阻率在104到1011Ω/sq的范围内。
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JP4386863B2 (ja) * | 2005-02-21 | 2009-12-16 | 日本発條株式会社 | ヘッド・サスペンション |
JP4790447B2 (ja) * | 2006-03-02 | 2011-10-12 | 日東電工株式会社 | 回路付サスペンション基板 |
US7782571B2 (en) * | 2006-04-05 | 2010-08-24 | Nitto Denko Corporation | Wired circuit board and production method thereof |
US7465884B2 (en) * | 2006-04-20 | 2008-12-16 | Nitto Denko Corporation | Wired circuit board |
JP4187757B2 (ja) * | 2006-06-22 | 2008-11-26 | 日東電工株式会社 | 配線回路基板 |
JP4919727B2 (ja) * | 2006-08-04 | 2012-04-18 | 日東電工株式会社 | 配線回路基板 |
JP4923295B2 (ja) * | 2006-09-13 | 2012-04-25 | 株式会社東芝 | サスペンション装置 |
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US20060187587A1 (en) | 2006-08-24 |
CN1825433A (zh) | 2006-08-30 |
US7643252B2 (en) | 2010-01-05 |
JP2006228386A (ja) | 2006-08-31 |
JP4326484B2 (ja) | 2009-09-09 |
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