CN104681042A - 包括优化用于热辅助磁记录的激光器传输线的磁盘驱动器 - Google Patents
包括优化用于热辅助磁记录的激光器传输线的磁盘驱动器 Download PDFInfo
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Abstract
本发明涉及包括优化用于热辅助磁记录的激光器传输线的磁盘驱动器。公开了一种包含磁盘和磁头的磁盘驱动器，所述磁头包含激光器，所述激光器经配置以在向磁盘写入时加热磁盘。至少一个传输线将激光器驱动器与激光器耦合。通过提供脉冲给激光器驱动器而将数据写入磁盘，其中传输线包含阻抗，该阻抗使得激光器输出的光功率成目标脉冲形状。
Description
技术领域
背景技术
磁盘驱动器包含磁盘和磁头，磁头与致动器臂的远端连接，所述致动器臂通过音圈电机(VCM)绕枢轴旋转以将磁头径向定位在磁盘上方。磁盘包含多个径向间隔的同心磁道，其用于记录用户数据扇区和伺服扇区。伺服扇区包含磁头定位信息(例如，磁道地址)，其由磁头读取并由伺服控制系统处理以在致动器臂沿着磁道搜索时控制致动器臂。
图1示出现有技术磁盘格式2，其包含若干伺服磁道4，所述伺服磁道4由围绕每个伺服磁道周围记录的伺服扇区60-6N定义。每个伺服扇区6i包含前导码8和同步标记10，所述前导码8用于存储周期图案，其允许读信号合适的增益调整和时序同步，所述同步标记10用于存储特殊图案，所述特殊图案用于符号同步到伺服数据字段12。伺服数据字段12存储粗磁头定位信息，例如伺服磁道地址，该粗磁头定位信息用于在搜索操作期间将磁头定位在目标数据磁道上方。每个伺服扇区6i进一步包含伺服脉冲14组(例如，N和Q伺服脉冲)，其被记录有相对于彼此并相对于伺服磁道中心线的预定相位。基于相位的伺服脉冲14提供精细磁头定位信息，该精细磁头定位信息用于在写/读操作期间访问数据磁道时沿中心线跟踪。位置误差信号(PES)通过读取伺服脉冲14生成，其中PES表示磁头相对于目标伺服磁道中心线的测量位置。伺服控制器处理PES，以生成施加到磁头致动器(例如，音圈电机)的控制信号，以便在减小PES的方向上径向致动磁盘上方的磁头。
通常情况下，通过调制感应线圈中的写电流以在被称为饱和记录的过程中将磁转变记录到磁盘表面上来将数据写入磁盘。在回读期间，读元件(例如，磁阻性元件)感测磁性转变并由合适的读信道解调生成的读信号。热辅助磁记录(HAMR)是最近开发的一种技术，它通过在写操作期间使用激光器加热磁盘表面来降低磁介质的矫顽力，因而使得写入线圈产生的磁场能够更容易磁化磁盘表面，从而改善写入数据的质量。
附图说明
图1示出现有技术磁盘格式，其包含由伺服扇区定义的多个伺服磁道。
图2A示出根据一个实施例的磁盘驱动器，该磁盘驱动器包含磁盘、磁头和控制电路。
图2B示出一个实施例，其中磁头包含激光器，其经配置以在向磁盘写入时加热磁盘。
图2C示出一个实施例，其中激光器驱动器通过传输线与激光器耦合。
图2D示出一个实施例，其中激光器驱动器在向磁盘写入数据时被提供脉冲，其中传输线包含阻抗，该阻抗使得激光器输出目标脉冲形状。
图3示出一个实施例，其中传输线的阻抗小于40欧姆并且至少比激光器的阻抗大10％。
图4示出一个实施例，其中激光器输出的目标脉冲形状对应于传输线的阻抗，该阻抗小于40欧姆并且至少比激光器的阻抗大10％。
图5A示出现有技术差分边缘耦合传输线和单端边缘耦合传输线的例子。
图5B示出现有技术差分堆叠传输线和单端堆叠传输线的例子。
图6A示出一个实施例，其中传输线的阻抗可以通过增加堆叠传输线的宽度和/或通过减小堆叠传输线之间的间距而减小。
图6B示出一个实施例，其中传输线的阻抗可以通过在至少三层中堆叠传输线而减小。
图6C示出一个实施例，其中传输线的阻抗可以通过交错边缘耦合传输线减小。
图6D示出一个实施例，其中传输线的阻抗可以通过增加边缘耦合传输线的交错而减小。
图6E示出一个实施例，其中传输线的阻抗可以通过采用四级配置而减小。
图6F示出一个实施例，其中传输线的阻抗可以通过采用多个交错的四级配置而减小。
具体实施方式
图2A示出根据一个实施例的磁盘驱动器，其包含磁盘16；磁头18，磁头18包含激光器20(图2B)，其经配置以在向磁盘16写入时加热磁盘16；以及至少一个传输线22，该传输线22将激光器驱动器24与激光器20(图2C)耦合。磁盘驱动器进一步包含控制电路26，其经配置以通过提供脉冲给激光器驱动器24而向磁盘16写入数据，其中传输线22包含阻抗，该阻抗使得激光器20(图2D)输出目标脉冲形状。
图2B的实施例中示出的磁头18包含合适的写元件28，例如感应线圈，其用于向磁盘16写入数据，和合适的读元件30，例如磁阻元件，其用于从磁盘16读取数据。当在写/读操作期间访问磁盘16时，在读取记录在磁盘16(例如，同心伺服扇区)上的伺服数据时，控制电路26处理从读元件30发出的读信号32，并解调伺服数据，以生成位置误差信号(PES)，该位置误差信号表示磁头的实际位置和相对于目标磁道的目标位置之间的误差。控制电路26使用合适的补偿滤波器对PES滤波，以生成施加到音圈电机(VCM)36的控制信号34，所述音圈电机绕枢轴旋转致动器臂38，以在减小PES的方向上径向致动磁盘16上方的磁头18。伺服数据可以包含任何合适的磁头位置信息，例如用于粗定位的磁道地址和用于精细定位的伺服脉冲。伺服脉冲可以包含任何合适的图案，例如基于幅度的伺服图案或基于相位的伺服图案(图1)。
图2B的实施例中可以采用任何合适的激光器20，例如激光器二极管。此外，磁头18可以包含任何合适的附加光学组件，其与激光器20关联，例如用于将激光器20发射的激光聚焦到磁盘表面的波导和近场换能器(NFT)。在其中一个实施例中，图2C中的激光器驱动器24调节通过传输线22施加到激光器20的功率，例如通过调整施加到激光器20的电流或电压，其中激光器20输出的光功率部分由施加到激光器20的输入功率确定。在图2D的实施例中，使用合适的占空比提供脉冲给激光器驱动器24，这可以提供多种好处，例如减少的NTF加热，改善的热梯度(可以改善信噪比(SNR))，减少的平均激光器功率(可以增加激光器的寿命)，改善的激光器稳定性等。在其中一个实施例中，图2D中所示的激光器20输出的光功率的脉冲形状取决于施加到激光器20的控制信号的幅度和占空比，以及传输线22的阻抗。
在其中一个实施例中，传输线22的阻抗基于提供脉冲给激光器20时流过激光器20的电流的幅度。例如，当高幅度脉冲施加到激光器20时，它可以增加流过激光器的产生的电流，从而减小激光器的阻抗。对于施加到激光器20的输入脉冲的给定幅度和占空比，由于传输线阻抗和激光器阻抗之间的较高比率，传输线阻抗的减小增加了激光器20的输出功率。
图4示出当施加输入电压脉冲39时，对于传输线22的不同阻抗值，激光器20生成光功率的不同输出脉冲形状。最小的输出脉冲40对应于大于40欧姆的传输线阻抗(例如，常规传输线可以包含50欧姆的阻抗)。这个较小输出脉冲不能提供对磁盘表面的充足加热，并因此会降低产生的读信号的SNR。输出脉冲可以通过增加施加到激光器20的输入功率(例如通过增加图2D中示出的输入脉冲的幅度和/或占空比)而增加。然而，由于它会增加功率电路系统的成本以及降低便携式应用中的电池寿命，因此增加施加到激光器20的输入功率可能是不理想的。因此，在其中一个实施例中，激光器20的输出脉冲可以通过减小传输线22的阻抗被增加，而无需调整输入脉冲。再次参考图4，对于输入脉冲的相同幅度和占空比，最大输出脉冲42对应于近似匹配激光器20的阻抗的传输线阻抗。然而，这个较大输出脉冲可以产生太多光功率，这会引起磁头18的至少一个组件的加热退化，例如激光器二极管或NFT，和/或它可以引起加热磁盘16的激光器光的过大斑点，这限制了数据磁道的最小宽度。此外，如图4所示，较小的输出脉冲可以具有小于更大的输出脉冲的宽度，这可以增加磁盘的热梯度，因此能够获得更高的面记录密度。因此，在图3中示出的其中一个实施例中，传输线22可以经过制造以包含小于40欧姆但至少比激光器20的阻抗大10％的阻抗。这可以获得图4中示出的最优输出脉冲44，这可以获得任何期望的性能益处，例如增加激光器组件的寿命、改善激光器稳定性、改善SNR、增加磁道密度、增加线性比特密度等。
图5A示出现有技术差分边缘耦合传输线和单端边缘耦合传输线的例子，图5B示出现有技术差分堆叠传输线和单端堆叠传输线的例子。图6A示出一个实施例，其中传输线的阻抗可以通过增加堆叠传输线的宽度和/或通过增加堆叠传输线(差分或单端)之间的间距而减小。图6B示出一个实施例，其中传输线的阻抗可以通过在至少三层中堆叠传输线来减小。例如，可以存在第一极性传输线夹在两个第二极性传输线之间或夹在两个接地线之间。图6C示出一个实施例，其中传输线的阻抗可以通过交错边缘耦合传输线而减小。例如，可以存在第一极性传输线与两个第二极性传输线交错或与两个接地线交错。图6D示出一个实施例，其中传输线的阻抗可以通过增加边缘耦合传输线的交错而减小。图6E示出一个实施例，其中传输线的阻抗可以通过采用四级配置而减小，以及图6F示出一个实施例，其中传输线的阻抗可以通过采用多个交错的四级配置而减小。
在其中一个实施例(例如图3中示出的)中，激光器驱动器24可以包含的阻抗基本上等于传输线22阻抗，这可以改善性能和降低成本，例如，通过降低激光器驱动器24生成的所需输出功率以获得施加到激光器20的期望输入功率。基本上使激光器驱动器24的阻抗与传输线22的阻抗匹配，也可以通过减少反射和/或寄生振荡而改善性能。
在图2D的实施例中，激光器驱动器24可以以任何合适的频率被提供脉冲。在其中一个实施例中，激光器驱动器24可以以数据写入磁盘的数据速率被提供脉冲。也就是说，在其中一个实施例中，可以存在每比特单元周期一个脉冲。在其他实施例中，激光器驱动器24可以以更高或更低频率被提供脉冲。此外，激光器驱动器24可以使用任何合适的占空比(包括小于50％和大于50％的占空比)被提供脉冲。
尽管已经描述了某些示例实施例，这些实施例仅作为示例提出，目的并不在于限制本文公开的发明的范围。因此，前面的描述并非旨在暗示任何具体特征、特性、步骤、模块或块是必要的或不可缺少的。实际上，本文描述的新颖方法和系统可以以各种其他形式实施；此外，在不脱离本文描述的实施例的精神下，可以对本文描述的方法和系统的形式进行各种省略、替代和改变。
Claims (28)
1.一种磁盘驱动器，其包含：
磁盘；
磁头，其包含激光器，所述激光器经配置以在向所述磁盘写入时加热所述磁盘；
至少一个传输线，其将激光器驱动器与所述激光器耦合；和
控制电路，其经配置以通过提供脉冲给所述激光器驱动器而将数据写入所述磁盘，其中所述传输线包含阻抗，所述阻抗使得所述激光器输出的光功率成目标脉冲形状。
2.根据权利要求1所述的磁盘驱动器，其中所述传输线的所述阻抗小于40欧姆。
3.根据权利要求2所述的磁盘驱动器，其中所述传输线的所述阻抗至少比所述激光器的阻抗大10％。
4.根据权利要求1所述的磁盘驱动器，其中所述传输线的所述阻抗基于提供脉冲给所述激光器时流过所述激光器的电流的幅度。
5.根据权利要求1所述的磁盘驱动器，其中所述目标脉冲形状减少所述磁头中的至少一个组件的加热退化。
6.根据权利要求5所述的磁盘驱动器，其中所述组件包含近场换能器。
7.根据权利要求1所述的磁盘驱动器，其中：
所述控制电路经进一步配置以从所述磁盘读取所述数据，从而生成读信号；以及
所述目标脉冲形状改善所述读信号的信噪比。
8.根据权利要求1所述的磁盘驱动器，其中所述目标脉冲形状的宽度增加所述磁盘的热梯度。
9.根据权利要求1所述的磁盘驱动器，其中所述激光器驱动器包含的阻抗基本上等于所述传输线的所述阻抗。
10.根据权利要求1所述的磁盘驱动器，其中所述至少一个传输线包含多个传输线，其包含用于传输第一极性电流的至少两个传输线和用于传送与第一极性相反的第二极性电流的至少一个传输线。
11.根据权利要求1所述的磁盘驱动器，其中所述至少一个传输线包含多个传输线，其包含用于传输第一极性电流的至少一个传输线和至少两个接地线。
12.根据权利要求1所述的磁盘驱动器，其中所述至少一个传输线包含多个传输线，其包含用于传输第一极性电流的至少两个传输线和用于传送与第一极性相反的第二极性电流的至少两个传输线。
13.根据权利要求12所述的磁盘驱动器，其中用于传输所述第一极性电流的所述至少两个传输线与用于传送所述第二极性电流的至少两个传输线交错。
14.根据权利要求12所述的磁盘驱动器，其中所述多个传输线包含至少一个四极配置。
15.一种操作磁盘驱动器的方法，所述方法包含：
通过提供脉冲给激光器驱动器，向磁盘写入数据，所述激光器驱动器与所述激光器通过传输线耦合，其中：
所述激光器经配置以在向所述磁盘写入数据时加热所述磁盘；以及
所述传输线包含阻抗，所述阻抗使得所述激光器输出的光功率成目标脉冲形状。
16.根据权利要求15所述的方法，其中所述传输线的所述阻抗小于40欧姆。
17.根据权利要求16所述的方法，其中所述传输线的所述阻抗至少比所述激光器的阻抗大10％。
18.根据权利要求15所述的方法，其中所述传输线的所述阻抗基于提供脉冲给所述激光器时流过所述激光器的电流的幅度。
19.根据权利要求15所述的方法，其中所述目标脉冲形状减少在所述磁盘上方被致动的磁头中的至少一个组件的加热退化。
20.根据权利要求19所述的方法，其中所述组件包含近场换能器。
21.根据权利要求15所述的方法，其中：
所述方法进一步包含从所述磁盘读取数据以生成读信号；以及
所述目标脉冲形状改善所述读信号的信噪比。
22.根据权利要求15所述的方法，其中所述目标脉冲形状的宽度增加所述磁盘的热梯度。
23.根据权利要求15所述的方法，其中所述激光器驱动器包含的阻抗基本上等于所述传输线的所述阻抗。
24.根据权利要求15所述的方法，其中所述至少一个传输线包含多个传输线，其包含用于传输第一极性电流的至少两个传输线，以及用于传送与第一极性相反的第二极性电流的至少一个传输线。
25.根据权利要求15所述的方法，其中所述至少一个传输线包含多个传输线，其包括用于传输第一极性电流的至少一个传输线和至少两个接地线。
26.根据权利要求15所述的方法，其中所述至少一个传输线包含多个传输线，其包括用于传输第一极性电流的至少两个传输线，以及用于传送与第一极性相反的第二极性电流的至少两个传输线。
27.根据权利要求26所述的方法，其中用于传输所述第一极性电流的所述至少两个传输线与用于传送所述第二极性电流的至少两个传输线交错。
28.根据权利要求26所述的方法，其中所述多个传输线包含至少一个四级配置。
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| US14/091,098 | 2013-11-26 | ||
| US14/091,098 US9064525B2 (en) | 2013-11-26 | 2013-11-26 | Disk drive comprising laser transmission line optimized for heat assisted magnetic recording |
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-
2013
- 2013-11-26 US US14/091,098 patent/US9064525B2/en active Active
-
2014
- 2014-11-26 CN CN201410693508.4A patent/CN104681042A/zh active Pending
-
2015
- 2015-07-24 HK HK15107086.3A patent/HK1206478A1/zh unknown
Also Published As
| Publication number | Publication date |
|---|---|
| HK1206478A1 (zh) | 2016-01-08 |
| US20150146506A1 (en) | 2015-05-28 |
| US9064525B2 (en) | 2015-06-23 |
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