-
公开(公告)号：US11798598B1
公开(公告)日：2023-10-24
申请号：US17587332
申请日：2022-01-28
CPC分类号： G11B33/1406 , G11B33/022 , G11B33/1486
摘要： Described are hard disk drives that include a low density atmosphere, with which is included a passivating gas, and methods of using these hard disk drives and methods of assembling these hard disk drives.
-
公开(公告)号：US10964354B1
公开(公告)日：2021-03-30
申请号：US16387070
申请日：2019-04-17
发明人： Robert D. Turner , Yuhang Cheng , Peter W. Kanas , Martin Liam McGarry , Peter Kevin McGeenhin , Kevin R. Heim , Edward Charles Gage , Shaikh Mubassar Ali , Huazhou Lou
摘要： A heat-assisted magnetic recording device is disposed in a hermetically sealed enclosure. The device includes a slider comprising a reader, a writer, and an optical waveguide configured to couple light from a light source to a near-field transducer situated at or near an air bearing surface of the slider. The near-field transducer comprises an enlarged portion and a peg extending from the enlarged portion in a direction of the air bearing surface. A fill gas is provided within the enclosure. The fill gas comprises a mixture of a low-density, inert gas and at least one gas that oxidizes carbon, where the total carbon oxidizing gas concentration of the fill gas is 3-50% by volume. In certain embodiments, the fill gas comprises a hydrogen concentration sufficient to retard oxidation of the peg when the peg is at an operating temperature associated with write operations.
-
公开(公告)号：US09824699B1
公开(公告)日：2017-11-21
申请号：US15420468
申请日：2017-01-31
CPC分类号： G11B5/09 , G11B5/58 , G11B5/6005 , G11B5/6088 , G11B7/126 , G11B11/10506 , G11B11/1051 , G11B2005/0021
摘要： A lumped-parameter function δ is determined that represents an average power dissipated by a write transducer when writing a signal to a magnetic recording medium. Temperatures of the write transducer are measured while varying the parameters to determine constants of the function δ. The function δ is used to adjust power applied to a clearance control heater when writing to the magnetic recording medium.
-
公开(公告)号：US20160232930A1
公开(公告)日：2016-08-11
申请号：US14619795
申请日：2015-02-11
发明人： Huazhou Lou , Jason Riddering
IPC分类号： G11B5/60
CPC分类号： G11B5/607 , G11B5/6029 , G11B5/6076 , G11B5/6088 , G11B2005/0021
摘要： A magnetic recording head comprises a transducer, a heater, a writer and a laser. The transducer is configured to write to a magnetic recording medium during a write operation. The heater, writer and laser are configured to affect a protrusion of the transducer. The heater is calibrated to produce a pre-write heater power to obtain a target pre-write clearance for a write operation through use of a clearance-heater power curve. The curve is generated by measuring a clearance between the transducer and the medium as the heater is cycled from zero to a contact power.
摘要翻译： 磁记录头包括换能器，加热器，写入器和激光器。 传感器配置为在写入操作期间写入磁记录介质。 加热器，写入器和激光器被配置成影响换能器的突起。 加热器被校准以产生预写加热器功率，以通过使用间隙加热器功率曲线获得用于写入操作的目标预写间隙。 当加热器从零循环到接触功率时，通过测量换能器和介质之间的间隙来产生曲线。
-
公开(公告)号：US09390741B2
公开(公告)日：2016-07-12
申请号：US14720299
申请日：2015-05-22
发明人： Michael Thomas Johnson , Dongming Liu , Huazhou Lou , Declan Macken , Timothy William Stoebe , James Gary Wessel , Xuan Zheng
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 head transducer, configured to interact with a magnetic recording medium, includes a first sensor having a temperature coefficient of resistance (TCR) and configured to produce a first sensor signal, and a second sensor having a TCR and configured to produce a second sensor signal. One of the first and second sensors is situated at or near a close point of the head transducer in relation to the magnetic recording medium, and the other of the first and second sensors spaced away from the close point. Circuitry is configured to combine the first and second sensor signals and produce a combined sensor signal indicative of one or both of a change in head-medium spacing and head-medium contact. Each of the sensors may have a TCR with the same sign (positive or negative) or each sensor may have a TCR with a different sign.
-
公开(公告)号：US09236081B1
公开(公告)日：2016-01-12
申请号：US14674360
申请日：2015-03-31
发明人： Alfredo S. Chu , Jason W. Riddering , Drew M. Mader , Huazhou Lou , Pu-Ling Lu
IPC分类号： G11B11/00 , G11B7/1267 , G11B11/105 , G11B7/1263 , G11B7/12 , G11B5/48 , G11B5/60
CPC分类号： G11B7/1263 , G11B5/012 , G11B5/455 , G11B5/4866 , G11B5/6088 , G11B11/10595 , G11B2005/0021
摘要： A method includes setting a heat assisted magnetic recording (HAMR) device located in a data storage system having a laser to an operating temperature. A threshold laser current is determined. An optimal laser current is determined. The threshold laser current and the optimal laser current are stored in memory. The steps of determining a threshold laser current, determining an optimal laser current and storing the threshold laser current and the optimal laser current into the calibration table are repeated until acceptable device performance is achieved at more than one operating temperature.
摘要翻译： 一种方法包括将位于具有激光的数据存储系统中的热辅助磁记录（HAMR）装置设置到工作温度。 确定阈值激光电流。 确定最佳激光电流。 阈值激光电流和最佳激光电流存储在存储器中。 重复确定阈值激光电流，确定最佳激光电流并将阈值激光电流和最佳激光电流存储到校准表中的步骤，直到在多于一个工作温度下实现可接受的器件性能。
-
7.发明申请HEAD TRANSDUCER WITH MULTIPLE RESISTANCE TEMPERATURE SENSORS FOR HEAD-MEDIUM SPACING AND CONTACT DETECTION 审中-公开具有多电阻温度传感器的头传感器用于中间间隔和接触检测公开(公告)号：US20140355150A1
公开(公告)日：2014-12-04
申请号：US14457694
申请日：2014-08-12
发明人： Michael Thomas Johnson , Dongming Liu , Huazhou Lou , Declan Macken , Timothy William Stoebe , James Gary Wessel , Xuan Zheng
IPC分类号： G11B5/60
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 head transducer, configured to interact with a magnetic recording medium, includes a first sensor having a temperature coefficient of resistance (TCR) and configured to produce a first sensor signal, and a second sensor having a TCR and configured to produce a second sensor signal. One of the first and second sensors is situated at or near a close point of the head transducer in relation to the magnetic recording medium, and the other of the first and second sensors spaced away from the close point. Circuitry is configured to combine the first and second sensor signals and produce a combined sensor signal indicative of one or both of a change in head-medium spacing and head-medium contact. Each of the sensors may have a TCR with the same sign (positive or negative) or each sensor may have a TCR with a different sign.
摘要翻译： 被配置为与磁记录介质相互作用的头传感器包括具有温度系数电阻（TCR）并被配置为产生第一传感器信号的第一传感器，以及具有TCR并被配置为产生第二传感器信号的第二传感器 。 第一传感器和第二传感器中的一个位于头部换能器相对于磁记录介质的接近点附近，并且第一传感器和第二传感器中的另一个与近端点间隔开。 电路被配置为组合第一和第二传感器信号并产生指示头 - 介质间隔和头 - 介质接触的变化中的一个或两个的组合的传感器信号。 每个传感器可以具有相同符号（正或负）的TCR，或者每个传感器可以具有不同符号的TCR。
-
公开(公告)号：US11468918B1
公开(公告)日：2022-10-11
申请号：US17322266
申请日：2021-05-17
摘要： A data storage drive includes a rotatable data storage medium, and a head communicatively couplable to the data storage medium. The head includes a temperature sensor and a heater. The data storage drive also includes a ramp for supporting the head when the head is moved away from the data storage medium, and a controller. The controller is configured to obtain first temperature sensor measurement values for different head heater power settings when the head is positioned on the ramp, and is configured to determine an internal pressure of the data storage drive as a function of the first temperature sensor measurement values.
-
公开(公告)号：US20210210121A1
公开(公告)日：2021-07-08
申请号：US17207027
申请日：2021-03-19
发明人： Robert D. Turner , Yuhang Cheng , Peter W. Kanas , Martin Liam McGarry , Peter Kevin McGeehin , Kevin R. Heim , Edward Charles Gage , Shaikh Mubassar Ali , Huazhou Lou
摘要： A heat-assisted magnetic recording device is disposed in a hermetically sealed enclosure. The device includes a slider comprising a reader, a writer, and an optical waveguide configured to couple light from a light source to a near-field transducer situated at or near an air bearing surface of the slider. The near-field transducer comprises an enlarged portion and a peg extending from the enlarged portion in a direction of the air bearing surface. A fill gas is provided within the enclosure. The fill gas comprises a mixture of a low-density, inert gas and at least one gas that oxidizes carbon, where the total carbon oxidizing gas concentration of the fill gas is 3-50% by volume. In certain embodiments, the fill gas comprises a hydrogen concentration sufficient to retard oxidation of the peg when the peg is at an operating temperature associated with write operations.
-
公开(公告)号：US09928873B1
公开(公告)日：2018-03-27
申请号：US15638839
申请日：2017-06-30
CPC分类号： G11B21/21 , G11B5/3106 , G11B5/40 , G11B5/6064 , G11B5/607 , G11B5/6076 , G11B5/6082 , G11B7/122 , G11B23/507 , G11B2005/0016
摘要： An apparatus comprises a slider configured for writing data to and reading data from a magnetic recording medium and for heat-assisted magnetic recording. The slider comprises a heater configured to receive an AC signal and to cause oscillation in a spacing between the slider and the medium, and a contact sensor situated on the slider and configured to produce a DC response signal. A detector is coupled to the slider and configured to measure an amplitude of a spike in the DC response signal, calculate a ratio between the spike amplitude and an amplitude of the DC response signal, and detect contact between the slider and the medium in response to the ratio exceeding a predetermined threshold.
-
-
-
-
-
-
-
-
-
搜索结果
32 条记录 (耗时 0.02 秒)
