公开(公告)号：US20140269819A1

公开(公告)日：2014-09-18

申请号：US13802386

申请日：2013-03-13

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： James Dillon Kiely ,  Karl Scheppers ,  Declan Macken ,  Michael Thomas Johnson

IPC: G01B21/16

CPC classification number: G11B5/6076 ,  G11B5/3116 ,  G11B5/3133 ,  G11B5/3136 ,  G11B5/314 ,  G11B5/607 ,  G11B5/6088 ,  G11B2005/0021

Abstract: An apparatus is arranged to detect contact between an air bearing surface of a transducer and a medium using a modulated thermal sensor signal. A laser source produces modulated laser light. A thermal sensor is disposed at or near the air bearing surface and is subject to cyclic heating by the modulated laser light. The thermal sensor is configured to produce the modulated sensor signal in response to the cyclic heating.

Abstract translation: 一种装置被布置成使用调制的热传感器信号检测换能器的空气轴承表面和介质之间的接触。 激光源产生调制激光。 热传感器设置在空气轴承表面上或附近，并且通过调制的激光进行循环加热。 热传感器被配置为响应于循环加热产生调制的传感器信号。

公开(公告)号：US11120826B1

公开(公告)日：2021-09-14

申请号：US17087065

申请日：2020-11-02

Applicant: Seagate Technology LLC

Inventor： Michael Thomas Johnson ,  Peng Peng ,  Declan Macken

IPC: G11B5/60

Abstract: The present disclosure includes systems and methods for using a comparator-based, relaxation oscillator circuit to detect capacitance of a capacitor formed between a metallic feature in a read/write head and a metallic feature in a storage medium.

公开(公告)号：US09940959B1

公开(公告)日：2018-04-10

申请号：US15615399

申请日：2017-06-06

Applicant: Seagate Technology LLC

Inventor： Steven Douglas Granz ,  Michael Thomas Johnson

IPC: G11B11/00 ,  G11B5/60 ,  G11B5/00 ,  G11B7/1263 ,  G11B11/105 ,  G11B7/126

CPC classification number: G11B5/4555 ,  G11B5/607 ,  G11B5/6088 ,  G11B7/126 ,  G11B7/1263 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

Abstract: A method and apparatus are directed to providing relative movement between a slider configured for heat-assisted magnetic recording and a magnetic recording medium, and causing protrusion of a portion of an air bearing surface (ABS) of the slider in response to activating at least a laser source while maintaining spacing between the protrusion and the medium. A magnitude of at least a portion of the protrusion is measured while maintaining spacing between the protrusion and the medium.

公开(公告)号：US09916847B1

公开(公告)日：2018-03-13

申请号：US15153103

申请日：2016-05-12

Applicant: Seagate Technology LLC

Inventor： Steven Douglas Granz ,  Michael Thomas Johnson ,  Patrick Carl Fletcher ,  Manuel Charles Anaya-Dufresne ,  Peng Peng

IPC: G11B11/00 ,  G11B5/455 ,  G11B5/00 ,  G11B7/1263 ,  G11B11/105 ,  G11B5/60 ,  G11B7/1267 ,  G11B7/126

CPC classification number: G11B5/455 ,  G11B5/6088 ,  G11B7/126 ,  G11B7/1263 ,  G11B7/1267 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

Abstract: An apparatus comprises a thermal sensor configured to interact with a magnetic recording disk. A head-disk interface is defined between the thermal sensor and the disk. A power supply is coupled to the thermal sensor and configured to supply a bias power to the thermal sensor between a low power and a high power. A processor is coupled to the thermal sensor and configured to determine a slope of a resistance response of the thermal sensor. The processor is further configured to detect a change in the slope relative to a baseline slope. The slope change indicates increased heat sinking between the thermal sensor and the disk due to the presence of contaminant buildup at the head-disk interface.

公开(公告)号：US09454986B2

公开(公告)日：2016-09-27

申请号：US14834140

申请日：2015-08-24

Applicant: Seagate Technology LLC

Inventor： Michael Thomas Johnson ,  Manuel Charles Anaya-Dufresne ,  Zoran Jandric

IPC: G11B11/00 ,  G11B7/1263 ,  G11B5/02 ,  G11B5/31 ,  G11B5/40 ,  G11B5/455 ,  G11B5/60 ,  G11B13/08 ,  G11B11/105 ,  G11B5/00

CPC classification number: G11B7/1263 ,  G11B5/02 ,  G11B5/3136 ,  G11B5/40 ,  G11B5/455 ,  G11B5/607 ,  G11B11/10515 ,  G11B11/10595 ,  G11B13/08 ,  G11B2005/0021

Abstract: A light source is configured to produce light, a waveguide is optically coupled to the light source and configured to direct the light to an intended focus location, and a slider is configured to use the light as an energy source for heating a region of a magnetic recording medium. A thermal sensor is situated on the slider at a location outside of a light path that includes the intended focus location. The thermal sensor is configured for sensing a short time constant change in temperature resulting from light source heating of the thermal sensor, wherein the sensed change in thermal sensor temperature is representative of optical intensity of the light delivered to the intended focus location.

公开(公告)号：US20150364148A1

公开(公告)日：2015-12-17

申请号：US14836010

申请日：2015-08-26

Applicant: Seagate Technology LLC

Inventor： Peng Peng ,  Declan Macken ,  Michael Thomas Johnson ,  Zheying Guo

IPC: G11B5/60

CPC classification number: G11B5/6076 ,  G11B5/1278 ,  G11B5/3133 ,  G11B5/3143 ,  G11B5/607

Abstract: A writer core of a transducer is configured to interact with a magnetic recording medium and comprises an upper core and a lower core. At least one of the upper and lower cores comprises a return pole having a return shield. The apparatus also comprises a writer pole between the upper and lower cores, and a writer gap defined between the writer pole and the return shield. The apparatus further comprises a sensor element within one of the upper and lower cores that includes the writer gap. The sensor element has a temperature coefficient of resistance and is configured to sense for a change in temperature indicative of one or both of a change in spacing and contact between the transducer and the magnetic recording medium.

Abstract translation: 传感器的写入器核心被配置为与磁记录介质相互作用并且包括上芯和下芯。 上芯和下芯中的至少一个包括具有返回屏蔽的返回极。 该装置还包括位于上芯和下芯之间的写极，以及限位在写杆和返挡板之间的写入器间隙。 该装置还包括在包括写入器间隙的上芯和下芯之一内的传感器元件。 传感器元件具有电阻的温度系数，并且被配置为感测指示换能器和磁记录介质之间的间隔和接触的变化中的一个或两个的温度变化。

公开(公告)号：US09159349B2

公开(公告)日：2015-10-13

申请号：US14012480

申请日：2013-08-28

Applicant: Seagate Technology LLC

Inventor： Peng Peng ,  Declan Macken ,  Michael Thomas Johnson ,  Zheying Guo

IPC: G11B5/60

CPC classification number: G11B5/6076 ,  G11B5/1278 ,  G11B5/3133 ,  G11B5/3143 ,  G11B5/607

Abstract: A writer core of a transducer is configured to interact with a magnetic recording medium and comprises an upper core and a lower core. At least one of the upper and lower cores comprises a return pole having a return shield. The apparatus also comprises a writer pole between the upper and lower cores, and a writer gap defined between the writer pole and the return shield. The apparatus further comprises a sensor element within one of the upper and lower cores that includes the writer gap. The sensor element has a temperature coefficient of resistance and is configured to sense for a change in temperature indicative of one or both of a change in spacing and contact between the transducer and the magnetic recording medium.

Abstract translation: 传感器的写入器核心被配置为与磁记录介质相互作用并且包括上芯和下芯。 上芯和下芯中的至少一个包括具有返回屏蔽的返回极。 该装置还包括位于上芯和下芯之间的写极，以及限位在写杆和返挡板之间的写入器间隙。 该装置还包括在包括写入器间隙的上芯和下芯之一内的传感器元件。 传感器元件具有电阻的温度系数，并且被配置为感测指示换能器和磁记录介质之间的间隔和接触的变化中的一个或两个的温度变化。

公开(公告)号：US20150255102A1

公开(公告)日：2015-09-10

申请号：US14720299

申请日：2015-05-22

Applicant: Seagate Technology LLC

Inventor： Michael Thomas Johnson ,  Dongming Liu ,  Huazhou Lou ,  Declan Macken ,  Timothy William Stoebe ,  James Gary Wessel ,  Xuan Zheng

IPC: G11B5/60

CPC classification number: G11B5/607 ,  G01K13/00 ,  G11B5/024 ,  G11B5/3133 ,  G11B5/6011 ,  G11B5/6076 ,  G11B7/0948 ,  G11B7/121 ,  G11B20/10 ,  G11B27/36

Abstract: 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.

Abstract translation: 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：US09036290B2

公开(公告)日：2015-05-19

申请号：US14457678

申请日：2014-08-12

Applicant: Seagate Technology LLC

Inventor： Michael Thomas Johnson ,  Dongming Liu ,  Huazhou Lou ,  Declan Macken ,  Timothy William Stoebe ,  James Gary Wessel ,  Xuan Zheng

IPC: G11B21/02 ,  G11B20/10 ,  G11B5/60

CPC classification number: G11B5/607 ,  G01K13/00 ,  G11B5/024 ,  G11B5/3133 ,  G11B5/6011 ,  G11B5/6076 ,  G11B7/0948 ,  G11B7/121 ,  G11B20/10 ,  G11B27/36

Abstract: 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.

Abstract translation: 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：US08995076B1

公开(公告)日：2015-03-31

申请号：US14257266

申请日：2014-04-21

Applicant: Seagate Technology LLC

Inventor： Daniel W. Olson ,  David J. Ellison ,  Michael Thomas Johnson

IPC: G11B5/02 ,  G11B5/596

CPC classification number: G11B5/596 ,  G11B5/607 ,  G11B5/6076

Abstract: An apparatus of the present disclosure generally includes a recording head, circuitry, a thermal sensor, and a detector. The recording head has an electromagnetic attraction to a recording medium. The circuitry is configured to oscillate the electromagnetic attraction between the recording head and the recording medium. The oscillating electromagnetic attraction produces a corresponding oscillating clearance between the recording head and the recording medium. The thermal sensor, located in or near the recording head, senses an oscillating temperature that is induced by the oscillating clearance and produces a sensor signal that is representative of the sensed temperature. The detector is coupled to the thermal sensor and is configured to detect at least one of head-medium contact and clearance using the sensor signal and the electromagnetic attraction.

Abstract translation: 本公开的装置通常包括记录头，电路，热传感器和检测器。 记录头对记录介质具有电磁吸引力。 电路被配置为在记录头和记录介质之间振荡电磁吸引力。 振荡电磁吸引力在记录头和记录介质之间产生相应的振荡间隙。 位于记录头或附近的热传感器感测由振荡间隙引起的振荡温度，并产生代表感测温度的传感器信号。 检测器耦合到热传感器并且被配置为使用传感器信号和电磁吸引力来检测头 - 介质接触和间隙中的至少一个。