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公开(公告)号：US09978405B1
公开(公告)日：2018-05-22
申请号：US15444518
申请日：2017-02-28
IPC分类号： G11B11/00 , G11B5/31 , G11B5/00 , G11B5/60 , G11B7/1267 , G11B7/1263 , G11B7/127
CPC分类号： G11B5/314 , G11B5/6005 , G11B5/6011 , G11B5/607 , G11B5/6076 , G11B5/6088 , G11B7/1263 , G11B7/1267 , G11B7/127 , G11B2005/0021
摘要： A slider configured for heat-assisted magnetic recording comprises an air bearing surface (ABS), a writer, and a close point of the writer. A plurality of heat producing or dissipating components are situated a predetermined distance from a vertical plane that is normal to the ABS and aligned with the close point. A location of the writer close point remains substantially consistent irrespective of which of the plurality of heat producing or dissipating components are energized.
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公开(公告)号：US09818439B1
公开(公告)日：2017-11-14
申请号：US15073848
申请日：2016-03-18
发明人： Jason Riddering , Huazhou Lou
CPC分类号： G11B5/6029 , G11B5/012 , G11B5/4866 , G11B5/6011 , G11B5/607 , G11B5/6088 , G11B19/046 , G11B20/10314 , G11B20/10388 , G11B2005/0021
摘要： A change in servo active gain control values is determined from a beginning of a writing of a test region of a recording medium to an end of the writing of the test region. The servo active gain control values are read from servo marks by a read transducer of a read/write head during the writing. After writing of the test region, the test region is read by the read transducer to determine a change in recorded amplitude from the beginning of the writing to the end of the writing. A gamma value of the read/write head is determined based on the change in servo active gain control values and the change in recorded amplitude.
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公开(公告)号：US09812161B2
公开(公告)日：2017-11-07
申请号：US15251663
申请日：2016-08-30
IPC分类号： G11B21/02 , G11B5/60 , G11B20/10 , G01K13/00 , G11B5/024 , G11B5/31 , G11B27/36 , G11B7/09 , G11B7/121
CPC分类号： G11B5/607 , G01K13/00 , G11B5/024 , G11B5/3133 , G11B5/6011 , G11B5/6076 , G11B7/0948 , G11B7/121 , G11B20/10 , G11B27/36
摘要： A sensor supported by a head transducer has a temperature coefficient of resistance (TCR) and a sensor resistance. The sensor operates at a temperature above ambient and is responsive to changes in sensor-medium spacing. Conductive contacts connected to the sensor have a contact resistance and a cross-sectional area adjacent to the sensor larger than that of the sensor, such that the contact resistance is small relative to the sensor resistance and negligibly contributes to a signal generated by the sensor. A multiplicity of head transducers each support a TCR sensor and a power source can supply bias power to each sensor of each head to maintain each sensor at a fixed temperature above an ambient temperature in the presence of heat transfer changes impacting the sensors. A TCR sensor of a head transducer can include a track-oriented TCR sensor wire for sensing one or both of asperities of the medium.
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公开(公告)号：US09640212B2
公开(公告)日：2017-05-02
申请号：US14997273
申请日：2016-01-15
申请人： Elwha LLC
CPC分类号： G11B5/6011 , G11B5/455 , G11B5/6076 , G11B7/0908 , G11B7/122 , G11B20/10 , G11B20/10481 , G11B21/21
摘要： A control mechanism may control the height and/or position of a read/write head configured to interact with a rotating information storage surface. A computation unit may compute a detected topography from gap measurements using a dynamic filter including a model of read/write head dynamics. A sensor may detect gap measurements of a side read/write track while the read/write head is interacting with a current read/write track. A memory may store the detected topography. The control mechanism may adjust the height of the read/write head based on the detected and/or stored topography. The control mechanism may be a reactionless control mechanism configured to apply a counterforce to offset movements of the read/write head and/or a slider.
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公开(公告)号：US20170092313A1
公开(公告)日：2017-03-30
申请号：US15237878
申请日：2016-08-16
发明人： Daniel W. Olson , Declan Macken , Andrea L. Geer
IPC分类号： G11B5/60
CPC分类号： G11B5/6011 , G11B5/6035 , G11B5/607 , G11B5/6076
摘要： An apparatus comprises circuitry configured to apply an AC signal having a frequency to one of a slider of a recording head and a magnetic recording medium. The applied AC signal causes an oscillation in an electrostatic force and clearance between the slider and the medium at the frequency of the AC signal. A thermal sensor is configured to generate a sensor signal at the AC signal frequency in response to sensing changes in temperature resulting from the oscillating clearance. A detector is coupled to the circuitry and the thermal sensor. The detector is configured to detect one or both of head-medium spacing changes and head-medium contact using a phase of a first harmonic or an amplitude of a second harmonic of the thermal sensor signal.
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公开(公告)号：US09336808B2
公开(公告)日：2016-05-10
申请号：US14443548
申请日：2013-01-31
发明人： Mike Alan Holmberg , Geoff Spratt , Brian Brong , Mike Sharrock , Steven L. Brittenham , Scott A. Swanbeck , Eric Petersen , Lawrence A. Hansen , Paul W. Poorman
CPC分类号： G11B5/00813 , G11B5/00826 , G11B5/09 , G11B5/3903 , G11B5/6011 , G11B5/78 , G11B20/10287 , G11B2005/0021
摘要： A system including a magnetic tape processing system that includes a read/write head to write to a top surface of a magnetic tape. The read/write head provides a write head field gradient of at least 40 Oersteds per nanometer at the top surface of the magnetic tape. The magnetic tape processing system and the read/write head provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.
摘要翻译： 一种包括磁带处理系统的系统，该系统包括用于写入磁带顶表面的读/写头。 读/写头在磁带的顶表面提供每纳米至少40奥斯特的写头场梯度。 磁带处理系统和读/写头提供每英寸大于8000轨道的轨道密度，大于440千位/英寸的位密度和小于70的纵横比。
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公开(公告)号：US09251829B2
公开(公告)日：2016-02-02
申请号：US13317402
申请日：2011-10-17
申请人： Siu Yin Ngan , Qinghua Zeng , Ellis Cha
发明人： Siu Yin Ngan , Qinghua Zeng , Ellis Cha
CPC分类号： G11B5/607 , G11B5/6011 , G11B5/6029 , G11B5/6076 , G11B27/36 , G11B2220/2516
摘要： Dynamic fly height (DFH) controlled read/write heads using multiple heaters have their heater powers set within a range of ratios that allows minimum clearances to be set between the read-gap and the write-gap and the surface of a disk, thereby providing improved touch-down detection. Determining the correct range of power ratios requires varying the ratio to create an adjustable protrusion profile for the read and write elements in the head and measuring values of the ratio and corresponding values of read gap and write gap clearances that create points of minimum clearance. By adjusting the ratio of power supplied to the heaters, different protrusion profiles can be produced, clearance control for sigma reduction can be obtained and read/write readiness and operation consistency and reliability can be improved.
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公开(公告)号：US09240211B2
公开(公告)日：2016-01-19
申请号：US14667392
申请日：2015-03-24
申请人： Elwha LLC
CPC分类号： G11B5/6011 , G11B5/455 , G11B5/6076 , G11B7/0908 , G11B7/122 , G11B20/10 , G11B20/10481 , G11B21/21
摘要： A control mechanism may control the height and/or position of a read/write head configured to interact with a rotating information storage surface. A computation unit may compute a detected topography from gap measurements using a dynamic filter including a model of read/write head dynamics. A sensor may detect gap measurements of a side read/write track while the read/write head is interacting with a current read/write track. A memory may store the detected topography. The control mechanism may adjust the height of the read/write head based on the detected and/or stored topography. The control mechanism may be a reactionless control mechanism configured to apply a counterforce to offset movements of the read/write head and/or a slider.
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公开(公告)号：US09230594B2
公开(公告)日：2016-01-05
申请号：US14287419
申请日：2014-05-27
CPC分类号： G11B5/607 , G01K13/00 , G11B5/024 , G11B5/3133 , G11B5/6011 , G11B5/6076 , G11B7/0948 , G11B7/121 , G11B20/10 , G11B27/36
摘要： A temperature sensor of a head transducer measures temperature near or at the close point. The measured temperature varies in response to changes in spacing between the head transducer and a magnetic recording medium. A detector is coupled to the temperature sensor and is configured to detect a change in a DC component of the measured temperature indicative of onset of contact between the head transducer and the medium. Another head transducer configuration includes a sensor having a sensing element with a high temperature coefficient of resistance to interact with asperities of the medium. Electrically conductive leads are connected to the sensing element and have a low temperature coefficient of resistance relative to that of the sensing element, such thermally induced resistance changes in the leads have a negligible effect on a response of the sensing element to contact with the asperities.
摘要翻译： 头传感器的温度传感器测量靠近或接近的温度。 测量的温度响应于头部换能器和磁记录介质之间的间隔的变化而变化。 检测器耦合到温度传感器并且被配置为检测指示头部换能器和介质之间的接触开始的测量温度的DC分量的变化。 另一个头部传感器配置包括传感器，该传感器具有具有高温度系数的传感元件，以与介质的粗糙度相互作用。 导电引线连接到感测元件并且具有相对于感测元件的电阻的低温度系数，引线中的这种热感应电阻变化对感测元件与凹凸接触的响应具有可忽略的影响。
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10.发明申请ASPERITY AND HEAD-MEDIA CONTACT DETECTION USING MULTI-STAGE TEMPERATURE COEFFICIENT OF RESISTANCE SENSOR 审中-公开使用电阻传感器的多级温度系数进行平台和头部介质接触检测公开(公告)号：US20150380021A1
公开(公告)日：2015-12-31
申请号：US14827584
申请日：2015-08-17
发明人： Gary Joseph Kunkel , John L. Brand
IPC分类号： G11B5/31
CPC分类号： G11B5/607 , G01K13/00 , G11B5/024 , G11B5/3133 , G11B5/6011 , G11B5/6076 , G11B7/0948 , G11B7/121 , G11B20/10 , G11B27/36
摘要： A multi-stage sensor is situated on the head transducer and configured to interact with a magnetic recording medium. A first sensor stage of the multi-stage sensor has a temperature coefficient of resistance. A second sensor stage of the multi-stage sensor is coupled to the first sensor and has a temperature coefficient of resistance. The first sensor stage is configured to preferentially sense asperities of the media relative to the second sensor stage, and the second sensor stage configured to preferentially sense proximity to, and contact with, a surface of the media relative to the first sensor stage. The first and second sensor stages may be connected in series or in parallel.
摘要翻译： 多级传感器位于头部传感器上并被配置为与磁记录介质相互作用。 多级传感器的第一传感器级具有电阻的温度系数。 多级传感器的第二传感器级耦合到第一传感器并具有电阻的温度系数。 第一传感器级被配置为优先地感测相对于第二传感器级的介质的不均匀性，并且第二传感器级被配置为优先地感测与介质相对于第一传感器级的表面的接近和接触。 第一和第二传感器级可以串联或并联连接。
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