CN1260064A - 用于光盘数据存储系统的滑动器 - Google Patents

用于光盘数据存储系统的滑动器 Download PDF

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CN1260064A
CN1260064A CN97182317A CN97182317A CN1260064A CN 1260064 A CN1260064 A CN 1260064A CN 97182317 A CN97182317 A CN 97182317A CN 97182317 A CN97182317 A CN 97182317A CN 1260064 A CN1260064 A CN 1260064A
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M·J·沙恩哲
L·G·斯旺森
G·S·莫里
L·E·斯托弗
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SICHATER TEHC CO Ltd
Seagate Technology LLC
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Abstract

光学存储系统(10)包括用于以光学可读形式存储信息的光盘(12)。在最靠近所述光盘(12)的数据表面(48)的滑动器(20)上携带光学换能器(30),而且用于转换在盘片表面(48)上的信息。在所述滑动器(20)的空气轴承表面(56)上设有台面(54),而且设有围绕台面(54)延伸的电导体(52)。

Description

用于光盘数据存储系统的滑动器
发明背景
本发明一般涉及光盘数据存储系统。具体地说，本发明涉及在光盘数据存储系统的光头万向组件(gimbal assembly)中用到的滑动器。
光盘数据存储系统是用于存储大量技术的一种技术。通过把激光束聚焦在盘片的数据表面上并检测从数据表面反射或通过它透射的光。
一般，在光学存储系统中，数据是以在盘片的表面上携带的物理或磁标记形式，其中运用反射激光来检测该标记。在工业中已知多种不同的光盘技术。例如，当前用CD-ROM来存储数字数据，诸如计算机程序或数字化音乐。一般，在制造过程中永久地记录CD-ROM。另一种光学系统是写入一次读取多次(write-once read-many)(WORM)系统，其中用户可以永久地将信息些在空白盘片上。还希望的是，提供可擦除系统，诸如相位变化(phase change)和磁光(M-O)系统。相位变化系统通过感觉反射比变化来检测数据。M-O系统通过测量由于存储媒体导致的入射光偏振旋转来读取数据。
高密度光记录，特别是用于近场(near-field)记录(即，M-O或相位变化系统)，一般需要用于在整个光学媒体的数据表面上携带换能装置的光头万向组件(OHGA)。OHGA包括当盘片以高速旋转时在光盘的数据表面附近“飞翔”的滑动器。用促动器来将滑动器径向定位在盘片表面上。美国专利第5,497,359号(1996年3月5日颁布，发明名称为“带有辐射-透明空气轴承滑动器的光盘数据存储系统”)示出与光盘数据存储系统一起使用的滑动器的例子。
为了把信息的磁位写在盘片表面上，光学加热盘片表面，例如用M-O媒体，激光束通过在滑动器中的光学成分直接指向高于媒体的居里温度的点。提供给在滑动器上携带的磁性线圈能量并关闭激光。当磁媒体冷却低于居里温度时，加热光点带有所需磁取向。然而，典型的现有技术滑动器没有为用于光记录的线圈设计达到最优化。
发明概述
本发明包括光学存储系统，它具有用于以光学可读形式将信息存储在数据表面上的光盘。驱动器壁具有可相对于所述盘片的数据表面径向可定位的端部。滑动器附在驱动器壁端部，而且适于在数据表面上飞翔。滑动器携带光学换能器，用于近场转换在所述数据表面上的光学信息。本发明的一个方面包括在滑动器的空气轴承表面上携带的台面。光学换能器的线圈由电导体形成并围绕台面延伸。在一个方面，光学换能器包括具有聚焦结构的光源和台面包括一部分聚焦结构。此外，在一个方面，台面包括适于通过瞬逝场将光耦合到数据表面的高地。在本发明的另一个方面，台面具有锥形侧壁和通过台面的光基本上形成锥体，其中锥体不延伸出侧壁。
附图说明
图1是示出根据本发明的光学存储系统的简化图。
图2是示出根据本发明的图1的滑动器的侧面图。
图3是示出根据本发明的台面的图2的滑动器的前剖面图。
图4是示出台面的图2和3的滑动器的仰视图。
较佳实施例的详细描述
本发明涉及光学数据存储系统。特别是，本发明涉及与光学数据存储系统一起使用的滑动器，它采用近场光学记录技术或者那些运用滑动器来携带换能头或另外与数据表面光学耦合来读取和/或写入信息。这样的光学数据存储系统运用滑动器来携带邻近光学存储媒体(诸如，光盘)的数据表面的光学换能元件。美国专利第5,497,359号(1996年5月颁布，发明名称为“带有辐射透明空气轴承滑动器的光盘数据存储系统”)示出为光学记录设计的一种滑动器。
例如，当光学记录信息运用近场(或瞬逝场)时，光学换能元件包括在滑动器上携带的固体浸没透镜(solid immersion lens)，它在磁盘上飞翔。在美国专利第5,125,750号(发明名称为“采用固体浸没透镜的光学记录系统)中示出这样的固体浸没透镜。为了把数据位写在M-O盘片上，激光通过固体浸没透镜把在盘片上的一小光点加热到媒体的居里温度之上。向在滑动器的空气轴承表面上携带的磁性线圈提供能量，并关闭激光器。当冷却磁媒体至低于居里点时，加热光点带有所需的磁取向。
该记录处理的效率依赖于快速打开和关闭激光器和线圈的能力。线圈必须提供充分大的磁场来保证按照需要磁取向媒体。对于线圈的磁场起作用的因素包括：
1)通过线圈的电流。(线性效应。)
2)在线圈中的匝数。(线性效应。)
3)与台面相关的线圈最内匝之间的分隔距离。(平方反比效应。)
快速打开和关闭线圈的能力是由线圈匝数占优确定的线圈电感的函数。
在设计线圈过程中的另一个因素是在操作期间由线圈产生的热量。热量生成是电流平分与线圈阻抗乘积(I2R)的函数。必须驱散在线圈的操作期间产生的热量。此外，在操作期间，热瞬时现象和大量热量可以具有严重的后果。理想的是，使由线圈产生的热量最小。
本发明的一个方面包括认识到新的滑动器设计，以及线圈结构来容纳在光学换能组件中的线圈和透镜元件。具体地说，本发明包括在定位在线圈的中央部分的空气轴承表面上的新台面。
图1是示出根据本发明采用滑动器的光学记录系统10的简化图。系统10包括光盘12，它具有携带光学编码信息的数据表面。盘片12围绕着主轴14旋转，而且由安装在底部的主轴马达16驱动。把滑动器20定位最靠近盘片12的位置上，并与驱动器22耦合，其中所述驱动器包括转子24和与底部18耦合的驱动器马达26。滑动器20包括光学换能器30。光学换能元件包括光源/传感器装置32。控制区34与装置32、驱动器26和数据总线36耦合，而且用于控制系统10的操作。
在操作期间，盘片12旋转和运用驱动器22沿着盘片12的数据表面径向定位滑动器20。控制区34控制滑动器20的位置，从而可以运用光源/传感器装置32来从盘片12的数据表面读取信息并通过数据总线36接收或发送。
图2是根据本发明的滑动器20的简化侧面图，并示出换能器元件30。示出滑动器20位于最靠近光盘12的数据表面48的位置上。在所示的实施例中，换能器元件30包括SIL型(固体浸没透镜)透镜(由透镜盖50和滑动器20主体形成)以及以线圈形状形成的导电体52。根据本发明，围绕台面54盘绕导电体52。滑动器20包括空气轴承表面56和端部表面(或反表面)58。在空气轴承表面56上携带台面54。盘片12沿着由箭头60所示的方向旋转，从而滑动器20具有引导边缘62和后缘(trailing edge)64。
根据提供为激光通过台面的光路径以及达到使电阻和电感最小同时使在媒体表面上的磁场最大的目的的需求，提供本发明的台面。
在一个实施例中，提供大约45度角的阶梯形台面(stepped mesa)设计。这最好通过运用两个阶梯掩模(step mask)工艺来完成。第一台面(空腔)掩模蚀刻小台面宽度，同时第二台面掩模蚀刻较大底部。这种带有在台面的底面角自然成圆形提供了获得所需设计的一种方法。对于该设计的一种折衷方案是附加掩模和蚀刻步骤。然而，该掩模还可能对容纳与光敏蚀刻剂黏附和蚀刻问题相关的制造的其他方面有用。通过改变离子蚀刻处理，还可以接近45度角来获得所需壁面轮廓(wall profile)。在这个例子中，可以改变与离子束路径相关的部分的角度来使台面具有达到所需角度的角度。
图3是详细示出台面54的滑动器的前剖面图。台面54包括阶梯70和高地(plateau)72。在所示的实施例中，阶梯70和高地72与表面56形成角度74大约呈45度角。图3还示出由通过透镜盖50进入滑动器20的光射线形成的圆锥形76。在一个较佳实施例中，选择台面54的角度和大小，从而圆锥形76紧跟着台面54的侧壁。另一方面，可以将台面壁设计成紧跟着光锥，于是可以尽可能紧地缠绕线圈。于是，本发明减小了台面末梢级的面积，从而允许更紧地盘绕导电体52。
图4是一部分滑动器20的底面剖视图。图4示出在空气轴承表面56上的台面54，其中上述台面54包括高地72和阶梯70。为了简化说明，图4中没有示出电导体52。
本发明提供优于现有技术的多个有利之处。这包括减小线圈的电导体长度，从而减小导致较少发热的线圈电阻。此外，在接近于台面的区域中使线圈结构变窄，从而增加线圈的磁场，同时减小匝数，以及产生磁场所需的电流。(注意，减小的匝数还减小线圈的电阻。)此外，通过减小在线圈结构中所需的匝数，减小线圈电感，从而还可以减小转换时间。这允许更快地转换，从而允许增加的数据速率。此外，在台面端部提供全半径，从而提供更平滑线圈平移和线圈中每匝的减小电阻。台面的阶梯结构还减小第一线圈区域电气短路的概率。偏置线圈结构还减小线圈的整个高度。较佳的是，将线圈设置在台面54的高地72之下。
本发明还与运用线圈的任何种光学系统一起使用，而且并不局限于这里所述的SIL的特定实施例。此外，可以形成多个阶梯。对于设计限制和系统最优化，可以适当地调节阶梯角度。也可采用平滑侧壁或其他侧壁几何形状。可以在滑动器中直接形成或者可以分开构成台面结构。特定的构成技术并不局限于这里所述的那些。
虽然参照较佳实施例描述本发明，但是熟悉本技术领域的人员应认识到可以在形式和细节上进行变化，而不偏离本发明的构思和范围。

Claims (15)

1.一种光盘存储系统，其特征在于，包括：
光盘，它具有数据表面；
驱动器臂，它具有有选择地径向可定位在数据表面附近的末梢端；
换能器元件，它包括光源和以线圈形式形成的电导体；
控制器，它与所述驱动器臂和所述换能元件耦合，并用于定位所述驱动器臂和用于通过所述换能元件转换在所述数据表面上的信息，在写入操作期间，所述控制器将电流施于所述电导体；和
滑动器，它与所述驱动器臂的末梢端耦合，而且携带所述换能元件，所述滑动器具有适于在所述盘片旋转时在所述数据表面附近移动的顶面和空气轴承表面，所述空气轴承表面包括在其上形成和构成来容纳所述线圈的台面，所述线圈最靠近所述空气轴承表面并围绕所述台面延伸。
2.如权利要求1所述的光盘数据存储系统，其特征在于，所述光源包含聚焦结构和所述台面包括一部分所述聚焦结构。
3.如权利要求2所述的光盘数据存储系统，其特征在于，所述台面包括适合于通过瞬逝场将光与所述数据表面耦合的高地。
4.如权利要求1所述的光盘数据存储系统，其特征在于，所述台面具有锥形侧壁。
5.如权利要求4所述的光盘数据存储系统，其特征在于，来自所述光源的光通过基本上形成锥体的所述台面，而且所述锥形侧壁的横截面大于所述锥体的横截面积，从而所述锥体不伸展出所述锥形侧壁，而且选择所述侧壁的所述锥形来基本上与所述覆盖层的所述锥形匹配。
6.如权利要求4所述的光盘数据存储系统，其特征在于，至少由在所述台面中的一个阶梯形成所述锥形侧壁。
7.如权利要求4所述的光盘数据存储系统，其特征在于，将一部分所述电导体定位在所述阶梯上。
8.如权利要求7所述的光盘数据存储系统，其特征在于，所述电导体包括第一线圈平面和第二线圈平面，所述第一线圈平面邻近于所述阶梯和所述第二线圈平面邻近于所述滑动器并定位在所述第一线圈平面和所述滑动器的所述空气轴承表面之间。
9.如权利要求4所述的光盘数据存储系统，其特征在于，所述锥形侧壁与所述滑动器的空气轴承表面呈大致45度角。
10.如权利要求2所述的光盘数据存储系统，其特征在于，所述聚焦结构包括固体浸没透镜(SIL)和所述台面形成一部分SIL。
11.如权利要求1所述的光盘数据存储系统，其特征在于，通过掩模和蚀刻处理在所述滑动器中形成所述台面。
12.如权利要求1所述的光盘数据存储系统，其特征在于，所述光源包括与所述滑动器的顶面耦合并基本上与所述台面成一直线的透镜盖。
13.如权利要求1所述的光盘数据存储系统，其特征在于，所述平台在空气轴承表面的平面内延长。
14.如权利要求1所述的光盘数据存储系统，其特征在于，所述光源包括激光器。
15.如权利要求1所述的光盘数据存储系统，其特征在于，用增加电感并减小所述电导体的电阻的方法形成所述线圈。
CN97182317A 1997-07-23 1997-10-07 用于光盘数据存储系统的滑动器 Pending CN1260064A (zh)

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