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1. 发明授权

US11211084B1 Protective shields under touchdown conditions for thermally assisted perpendicular magnetic recording 有权
公开(公告)号：US11211084B1
公开(公告)日：2021-12-28
申请号：US17072302
申请日：2020-10-16
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Qinghua Zeng , Siu Yin Ngan , Ellis Cha , Kowang Liu
IPC分类号： G11B11/105 , G11B5/39 , G11B5/60 , G11B5/48 , G11B5/00
摘要： A Perpendicular Magnetic Recording (PMR) head is configured for use in Thermally Assisted Magnetic Recording (TAMR). Two or three contiguous write shields, of various widths and thicknesses, formed on a leading edge side of the write gap (WG), main pole (MP) and near-field transducer (NFT), protect the head during write touchdowns (TD) and signal the approach of such a touchdown. Moreover during a write touchdown the contact with the head is restricted to the large write shields, producing a large touchdown area (TDA) and insuring the lifetime of the head.

2. 发明授权

US10811046B2 Air-bearing surface (ABS) design to reduce particle scratch risk 有权
公开(公告)号：US10811046B2
公开(公告)日：2020-10-20
申请号：US16033570
申请日：2018-07-12
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Ben Ng Kwun Pan , Ellis Cha
IPC分类号： G11B5/60 , G11B21/21 , G11B5/48 , G11B19/20
摘要： A slider design for a hard disk drive (HDD) features a shallow cavity adjacent to a leading edge that has patterns of sub-cavities of various shapes etched into its base to reduce its original surface area. The presence of these patterns of sub-cavities significantly reduces the probability that the slider will capture particles on the surface of a rotating disk and thereby reduces the corresponding probability of surface scratches that such captured particles inevitably produce.

3. 发明授权

US09940960B2 Air-bearing design for hydrocarbon and lube pick-up improvements in hard disk drive (HDD) 有权
公开(公告)号：US09940960B2
公开(公告)日：2018-04-10
申请号：US15162704
申请日：2016-05-24
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Ellis Cha , Sindy Yeung , Penny Wan Ting Looi , Ben Kwun Pan Ng
IPC分类号： G11B5/60
CPC分类号： G11B5/6082 , G11B5/6005
摘要： A slider design for a hard disk drive (HDD) features an air-bearing surface (ABS) topography with arrays of micro-dots formed on bases of a multiplicity of cavities at different depths. The design eliminates the accumulation of hydrocarbons (e.g., spindle oil and disk lubricant) deposits in regions of air stagnation within the cavities where backflows and foreflows of air meet and cancel during HDD operation. The micro-dots are small raised regions of various shapes having sizes and spacings in the range between 2 and 100 microns and, in a preferred embodiment, heights of 0.15 microns above the cavity bases.

4. 发明授权

US11232812B1 Air-bearing surface (ABS) design with side flow blocker for mitigating lube and hydrocarbon accumulation in hard disk drives (HDD) 有权
公开(公告)号：US11232812B1
公开(公告)日：2022-01-25
申请号：US17178978
申请日：2021-02-18
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Guoqiang Zheng , Ellis Cha
IPC分类号： G11B5/48 , G11B5/60 , G11B21/21
摘要： A slider-mounted read/write transducer for a hard disk drive (HDD) has a topology that mitigates attraction and accumulation of lubricant and hydrocarbons during the HDD operation. The slider topology may include a pattern of cavities and channels symmetrically disposed about a central longitudinal axis. The slider may also have a transverse channel extending perpendicularly inward from an opening in each side edge of the slider to intersect a channel that extends longitudinally along a middle axis towards a leading-edge pad in which a read/write transducer is embedded. The ends of the transverse channel open into an air-carrying groove extending vertically upward in the side of the slider in which a side flow blocker (SFB) restricts the air flow into the channel portion.

5. 发明授权

US10679653B1 High power ratio mode for TAMR drives 有权
公开(公告)号：US10679653B1
公开(公告)日：2020-06-09
申请号：US16296366
申请日：2019-03-08
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Qinghua Zeng , Siu Yin Ngan , Soramany Ka , Ellis Cha
IPC分类号： G11B11/105 , G11B11/10 , G11B5/48 , G11B5/60 , G11B5/127 , G11B5/00
摘要： A method of operating a HDD having a read/write head configured for Perpendicular Magnetic Recording (PMR) and configured for use in Thermally Assisted Magnetic Recording (TAMR). By using selected settings of a power ratio (PR) value to ensure that accurate fly height (FH) measurements of head-disk interference (HDI) can be taken during write touchdowns (TDs), head damage can be eliminated during HDI events. Under normal operating conditions the PMR head develops a sharp protrusion due to heating from the TAMR apparatus as well as the write current and read and write heaters. The sharp protrusion is prone to striking the disk surface, instead of the shields doing so. The shields would be more capable of absorbing the HDI, which would allow the HDI sensors (HDIs) to provide a more sensitive reading of the HDI which would prevent head wear caused by the sharp protrusion. By adjusting the power ratio (PR) to be at least the turning point (TP) value, the write shield will approach the disk surface before the sharp protrusion.

6. 发明授权

US09892746B1 ABS design with soft bumper pads (SBP) for mitigating media damage and thermal erasure in hard disk drives (HDD) 有权
公开(公告)号：US09892746B1
公开(公告)日：2018-02-13
申请号：US15431811
申请日：2017-02-14
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Guoqiang Zheng , Ellis Cha , Zhijun Liu , Qinghua Zeng
IPC分类号： G11B5/31 , G11B5/60 , G11B5/10 , G11B5/48 , H01L21/31 , G11B17/32 , G11B21/21
CPC分类号： G11B5/3106 , G11B5/102 , G11B5/48 , G11B5/4806 , G11B5/6005 , G11B5/6082 , G11B17/32 , G11B21/21 , H01L21/31
摘要： A slider design for a hard disk drive (HDD) features an air-bearing surface (ABS) topography with soft bumper pads (SBP) formed proximally to corners of the leading edge and the trailing edge. The bumper pads are formed by a process that combines the use of a first photomask for subtractive etching of the ABS to form pedestals, followed by additive depositions onto the pedestals using a second lift-off photomask. The additive process deposits sequences of Si layers and diamond-like carbon (DLC) layers to produce a soft bumper pad that is energy absorbing and heat conducting, thereby protecting the recording media from surface damage and thermal erasures.

7. 发明授权

US08976481B1 Touch down detection with HDI sensor DC mode 有权
标题翻译：使用HDI传感器直流模式进行触摸屏检测
公开(公告)号：US08976481B1
公开(公告)日：2015-03-10
申请号：US14182377
申请日：2014-02-18
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Qinghua Zeng , Ellis Cha , Soramany Ka
IPC分类号： G11B21/02 , G11B5/09
CPC分类号： G11B5/607 , G11B5/6076
摘要： Methods are provided for determining the heater power level of a dynamic flying height (DFH) type write head at which a touch down (TD) occurs. Each method makes use of the DC component of a head-disk interference (HDI) sensor and the determination of the TD heater energy is deduced from certain characteristics of the function relating heater power to HDI DC signal strength. Characteristics that provide reliable indication of a TD include points of minimum slope, structure of the slope's slope and the properties of a linear fit to the slope if the slope does not converge to a consistent value. It is found that the use of all methods in combination allow a reliable TD determination under virtually all conditions.
摘要翻译：提供了用于确定触发（TD）发生的动态飞行高度（DFH）型写入头的加热器功率电平的方法。每种方法利用头盘干扰（HDI）传感器的直流分量，并从加热器功率与HDI直流信号强度相关的功能的某些特性推导出TD加热器能量的确定。提供TD的可靠指示的特征包括最小坡度点，坡度斜率的结构以及如果斜率不会收敛到一致的值，则对斜率进行线性拟合的属性。发现组合使用所有方法可在几乎所有条件下进行可靠的TD测定。

8. 发明授权

US11114121B2 Air-bearing surface (ABS) design to reduce particle scratch risk 有权
公开(公告)号：US11114121B2
公开(公告)日：2021-09-07
申请号：US17073578
申请日：2020-10-19
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Ben Ng Kwun Pan , Ellis Cha
IPC分类号： G11B5/60 , G11B21/21 , G11B5/48 , G11B19/20
摘要： A slider design for a hard disk drive (HDD) features a shallow cavity adjacent to a leading edge that has patterns of sub-cavities of various shapes etched into its base to reduce its original surface area. The presence of these patterns of sub-cavities significantly reduces the probability that the slider will capture particles on the surface of a rotating disk and thereby reduces the corresponding probability of surface scratches that such captured particles inevitably produce.

9. 发明申请

US20170345452A1 Air-Bearing Design for Hydrocarbon and Lube Pick-Up Improvements in Hard Disk Drive (HDD) 有权
公开(公告)号：US20170345452A1
公开(公告)日：2017-11-30
申请号：US15162704
申请日：2016-05-24
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Ellis Cha , Sindy Yeung , Penny Wan Ting Looi , Ben Kwun Pan Ng
IPC分类号： G11B5/60
CPC分类号： G11B5/6082 , G11B5/6005
摘要： A slider design for a hard disk drive (HDD) features an air-bearing surface (ABS) topography with arrays of micro-dots formed on bases of a multiplicity of cavities at different depths. The design eliminates the accumulation of hydrocarbons (e.g., spindle oil and disk lubricant) deposits in regions of air stagnation within the cavities where backflows and foreflows of air meet and cancel during HDD operation. The micro-dots are small raised regions of various shapes having sizes and spacings in the range between 2 and 100 microns and, in a preferred embodiment, heights of 0.15 microns above the cavity bases.

10. 发明授权

US08576671B1 ABS design with multiple heaters 有权
标题翻译： ABS设计与多个加热器
公开(公告)号：US08576671B1
公开(公告)日：2013-11-05
申请号：US13708119
申请日：2012-12-07
申请人： SAE Magnetics (H.K.) Ltd. , Headway Technologies, Inc.
发明人： Ellis Cha , Ben Kwun Pan Ng
IPC分类号： G11B11/00 , G11B5/147
CPC分类号： G11B5/6082 , G11B5/3133 , G11B5/607 , G11B5/6076 , G11B2005/0021
摘要： A TAMR (thermal assisted magnetic recording) equipped DFH (dynamic flying height) type slider ABS design, when operating in a HDD (hard disk drive) produces exceptional low pressure/stiffness for improved touch down detection and back-off efficiency as well as wear and damage reduction due to the improved capabilities as well as reduction in heat transfers. The supplementation of the slider with multiple heaters, three herein, disposed about the write-head in the cross-track direction provides the slider with enhanced dynamic stability that would normally not be achievable with the exceptional low pressure/stiffness.
摘要翻译：配备DFH（动态飞行高度）型滑块ABS设计的TAMR（热辅助磁记录）在HDD（硬盘驱动器）中运行时，可以产生出色的低压/刚度，从而改善了触摸下降检测和回退效率以及磨损并且由于改进的能力以及减少热传递而损害减少。具有多个加热器的滑块的补充（在本文中，三个）以横向方向设置在写头附近，提供滑块具有增强的动态稳定性，这通常不能用特殊的低压/刚度来实现。

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