公开(公告)号：US10408674B2

公开(公告)日：2019-09-10

申请号：US16352243

申请日：2019-03-13

Applicant: Seagate Technology LLC

Inventor： James Dillon Kiely ,  John Charles Duda ,  Patrick Carl Fletcher ,  Andrei Dorobantu ,  Jon D. Trantham

IPC: G01J1/42 ,  G01K7/16

Abstract: An apparatus comprises a light source configured to generate light, and a modulator coupled to the light source and configured to modulate the light above a predetermined frequency. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A resistive sensor is integral to the slider and subject to heating by absorption of electromagnetic radiation and conduction of heat. Measuring circuitry is coupled to the resistive sensor and configured to measure a response of the resistive sensor due to absorbed electromagnetic radiation and not from the heat conduction. The measuring circuitry may further be configured to determine output optical power of the light source using the measured resistive sensor response.

公开(公告)号：US20190212192A1

公开(公告)日：2019-07-11

申请号：US16352243

申请日：2019-03-13

Applicant: Seagate Technology LLC

Inventor： James Dillon Kiely ,  John Charles Duda ,  Patrick Carl Fletcher ,  Andrei Dorobantu ,  Jon D. Trantham

IPC: G01J1/42 ,  G01K7/16

CPC classification number: G01J1/4257 ,  G01K7/16

Abstract: An apparatus comprises a light source configured to generate light, and a modulator coupled to the light source and configured to modulate the light above a predetermined frequency. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A resistive sensor is integral to the slider and subject to heating by absorption of electromagnetic radiation and conduction of heat. Measuring circuitry is coupled to the resistive sensor and configured to measure a response of the resistive sensor due to absorbed electromagnetic radiation and not from the heat conduction. The measuring circuitry may further be configured to determine output optical power of the light source using the measured resistive sensor response.

公开(公告)号：US10240975B2

公开(公告)日：2019-03-26

申请号：US15190462

申请日：2016-06-23

Applicant: Seagate Technology LLC

Inventor： James Dillon Kiely ,  John Charles Duda ,  Patrick Carl Fletcher ,  Andrei Dorobantu ,  Jon D. Trantham

IPC: G01J1/42 ,  G01K7/16

Abstract: An apparatus comprises a light source configured to generate light, and a modulator coupled to the light source and configured to modulate the light above a predetermined frequency. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A resistive sensor is integral to the slider and subject to heating by absorption of electromagnetic radiation and conduction of heat. Measuring circuitry is coupled to the resistive sensor and configured to measure a response of the resistive sensor due to absorbed electromagnetic radiation and not from the heat conduction. The measuring circuitry may further be configured to determine output optical power of the light source using the measured resistive sensor response.

公开(公告)号：US20170370770A1

公开(公告)日：2017-12-28

申请号：US15190462

申请日：2016-06-23

Applicant: Seagate Technology LLC

Inventor： James Dillon Kiely ,  John Charles Duda ,  Patrick Carl Fletcher ,  Andrei Dorobantu ,  Jon D. Trantham

IPC: G01J1/42

CPC classification number: G01J1/4257 ,  G01K7/16

Abstract: An apparatus comprises a light source configured to generate light, and a modulator coupled to the light source and configured to modulate the light above a predetermined frequency. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A resistive sensor is integral to the slider and subject to heating by absorption of electromagnetic radiation and conduction of heat. Measuring circuitry is coupled to the resistive sensor and configured to measure a response of the resistive sensor due to absorbed electromagnetic radiation and not from the heat conduction. The measuring circuitry may further be configured to determine output optical power of the light source using the measured resistive sensor response.

公开(公告)号：US10410668B1

公开(公告)日：2019-09-10

申请号：US16249452

申请日：2019-01-16

Applicant: Seagate Technology LLC

Inventor： Declan Macken ,  Tyler Lenn Perry ,  Karim Tatah ,  Andrei Dorobantu ,  Todd Michael Lammers

IPC: G11B5/00 ,  G11B7/1263 ,  G11B5/09 ,  G11B20/18 ,  G11B5/012

Abstract: A slider configured for heat-assisted magnetic recording includes a laser diode optically coupled to a waveguide of the slider. A power supply is coupled to the laser diode. A preamplifier is coupled to the power supply. The preamplifier is configured to monitor a forward voltage across the laser diode while operating the laser diode at a constant current during a write operation, detect a change in the forward voltage indicative of laser power instability, and generate a signal in response to detecting the forward voltage change.

公开(公告)号：US10255940B1

公开(公告)日：2019-04-09

申请号：US15408982

申请日：2017-01-18

Applicant: Seagate Technology LLC

Inventor： Declan Macken ,  Tyler Lenn Perry ,  Karim Tatah ,  Andrei Dorobantu ,  Todd Michael Lammers

IPC: G11B5/00 ,  G11B7/1263 ,  G11B5/09 ,  G11B20/18 ,  G11B5/012

Abstract: A slider configured for heat-assisted magnetic recording includes a laser diode optically coupled to a waveguide of the slider. A power supply is coupled to the laser diode. A preamplifier is coupled to the power supply. The preamplifier is configured to monitor a forward voltage across the laser diode while operating the laser diode at a constant current during a write operation, detect a change in the forward voltage indicative of laser power instability, and generate a signal in response to detecting the forward voltage change.

公开(公告)号：US10192578B1

公开(公告)日：2019-01-29

申请号：US16049331

申请日：2018-07-30

Applicant: Seagate Technology LLC

Inventor： Declan Macken ,  Tyler Lenn Perry ,  Karim Tatah ,  Andrei Dorobantu ,  Todd Michael Lammers

IPC: G11B5/00 ,  G11B7/1263 ,  G11B5/09 ,  G11B20/18 ,  G11B5/012

Abstract: A slider configured for heat-assisted magnetic recording includes a laser diode optically coupled to a waveguide of the slider. A power supply is coupled to the laser diode. A preamplifier is coupled to the power supply. The preamplifier is configured to monitor a forward voltage across the laser diode while operating the laser diode at a constant current during a write operation, detect a change in the forward voltage indicative of laser power instability, and generate a signal in response to detecting the forward voltage change.

公开(公告)号：US09502062B1

公开(公告)日：2016-11-22

申请号：US14928668

申请日：2015-10-30

Applicant: Seagate Technology LLC

Inventor： Andrei Dorobantu ,  Thomas C. Zirps ,  Tim Rausch

IPC: G11B5/596 ,  G11B5/00

CPC classification number: G11B5/59627 ,  G11B2005/0021

Abstract: First and second repeatable runout (ZAP) values are both located on a first virtual track of a magnetic disk. The first ZAP value is offset from the first virtual track center in a first direction and the second ZAP value is offset from the first virtual track center in a second direction opposite the first direction. At least one of the first and second ZAP values are accessed when performing repeatable runout correction for a writer of the read/write head that is being positioned over a second virtual track of the magnetic disk.

Abstract translation: 第一和第二可重复跳动（ZAP）值均位于磁盘的第一虚拟轨道上。 第一ZAP值在第一方向上偏离第一虚拟轨道中心，并且第二ZAP值在与第一方向相反的第二方向上偏离第一虚拟轨道中心。 当对位于磁盘的第二虚拟轨道上的读/写头的写入器执行可重复的跳动校正时，访问第一和第二ZAP值中的至少一个。