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公开(公告)号：US20170162222A1
公开(公告)日：2017-06-08
申请号：US14957220
申请日：2015-12-02
Applicant: Seagate Technology LLC
Inventor： Robert Matousek , Todd Lammers , Jon David Trantham
IPC: G11B11/105
CPC classification number: G11B11/10534 , G11B5/314 , G11B5/40 , G11B5/455 , G11B7/126 , G11B7/1263 , G11B7/1267 , G11B7/13 , G11B11/10595 , G11B19/046 , G11B2005/0021
Abstract: Methods and apparatuses for detecting mode hopping in a laser diode or other optical energy source in heat-assisted magnetic recording. An output power of the laser diode or other optical energy source is measured and the output power is differentiated over time to determine a rate of change. If it is determined that the rate of change exceeds a threshold value, a fault signal is asserted indicating a potential mode hopping event.
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公开(公告)号：US09245541B1
公开(公告)日：2016-01-26
申请号：US14701241
申请日：2015-04-30
Applicant: Seagate Technology LLC
Inventor： Jon Trantham , Todd Lammers
CPC classification number: G11B5/09 , G11B5/02 , G11B5/4853 , G11B19/046 , G11B2005/0021 , G11B2005/0024
Abstract: Apparatus for generating supply voltages in a data storage device. In some embodiments, the apparatus includes a data transducer adjacent a rotatable magnetic recording medium, the data transducer having a write coil and an electromagnetic source for thermally assisted recording by the write coil. A preamplifier/driver circuit (preamp) has a write driver adapted to supply write currents to the write coil and a source driver adapted to supply source voltage to the electromagnetic source. A voltage regulation circuit applies a first positive supply voltage to the write driver and a different, second positive supply voltage to the source driver.
Abstract translation: 一种用于在数据存储装置中产生电源电压的装置。 在一些实施例中，该装置包括邻近可旋转磁记录介质的数据传感器，数据传感器具有写入线圈和用于通过写入线圈进行热辅助记录的电磁源。 前置放大器/驱动器电路（前置放大器）具有适于向写入线圈提供写入电流的写入驱动器和适于将电源电压提供给电磁源的源极驱动器。 电压调节电路向写驱动器施加第一正电源电压，向源极驱动器施加不同的第二正电源电压。
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公开(公告)号：US09984719B2
公开(公告)日：2018-05-29
申请号：US14957220
申请日：2015-12-02
Applicant: Seagate Technology LLC
Inventor： Robert Matousek , Todd Lammers , Jon David Trantham
IPC: G11B11/00 , G11B11/105 , G11B7/126 , G11B5/40 , G11B5/455 , G11B19/04 , G11B7/13 , G11B5/31 , G11B7/1267 , G11B7/1263 , G11B5/00
CPC classification number: G11B11/10534 , G11B5/314 , G11B5/40 , G11B5/455 , G11B7/126 , G11B7/1263 , G11B7/1267 , G11B7/13 , G11B11/10595 , G11B19/046 , G11B2005/0021
Abstract: Methods and apparatuses for detecting mode hopping in a laser diode or other optical energy source in heat-assisted magnetic recording. An output power of the laser diode or other optical energy source is measured and the output power is differentiated over time to determine a rate of change. If it is determined that the rate of change exceeds a threshold value, a fault signal is asserted indicating a potential mode hopping event.
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