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公开(公告)号：US10803886B1
公开(公告)日：2020-10-13
申请号：US16234831
申请日：2018-12-28
摘要： An apparatus includes a slider configured for heat-assisted magnetic recording, the slider comprising an air bearing surface (ABS), a writer, a reader, and a plurality of electrical bond-pads. The apparatus also includes a first component situated at the ABS of the slider proximate the reader and operatively coupled to a first pair of the plurality of electrical bond-pads, the first component being a thermocouple configured to sense for a thermal aspect of a magnetic recording medium surface. According to aspects of the invention, the slider is configured to share at least one bond-pad by operatively coupling a second pair of the plurality of electrical bond-pads to a second component, and the slider is configured to selectively utilize the thermocouple and the second component.
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公开(公告)号：US09916850B1
公开(公告)日：2018-03-13
申请号：US15375368
申请日：2016-12-12
IPC分类号： G11B5/02 , G11B5/00 , G11B7/1263
CPC分类号： G11B5/012 , G11B5/314 , G11B2005/0021
摘要： A preamplifier circuit can include a control line dedicated to receive a control signal that corresponds to indicating a specific register of the preamplifier circuit, which can allow the preamplifier to switch between utilizing two or more registers to control a current output of the preamplifier circuit. The preamplifier circuit may also have a serial input to program multiple registers of the preamplifier circuit in a serial fashion. In some embodiments, the current output may be a laser bias current. The preamplifier may adjust an output current that drives a laser emitter based on a control signal indicating which specific registers controls the output current. Further, a controller, such as a system-on-chip controller, may selectively vary the control signal to affect the current output of the preamplifier circuit. These systems and methods may be particularly useful for lasers and heat-assisted magnetic recording (HAMR).
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公开(公告)号：US20170103781A1
公开(公告)日：2017-04-13
申请号：US14879214
申请日：2015-10-09
发明人： Todd Michael Lammers , Kaizhong Gao
CPC分类号： G11B5/012 , G11B5/02 , G11B5/29 , G11B5/4886 , G11B5/746 , G11B20/10009 , G11B20/10018 , G11B20/10027 , G11B27/36 , G11B2005/0021 , G11B2220/20 , G11B2220/90
摘要： First and second signal patterns are used to write corresponding portions of first and second adjacent tracks to a magnetic storage medium. A characteristic of the first signal pattern is changed based on the second signal pattern, the changing of the characteristic reducing an adjacent track interference affecting the second track.
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公开(公告)号：US09269377B2
公开(公告)日：2016-02-23
申请号：US14575288
申请日：2014-12-18
CPC分类号： G11B5/09 , G11B5/10 , G11B5/1278 , G11B5/3133 , G11B5/4833 , G11B5/4853 , G11B5/6005 , G11B5/6082
摘要： An apparatus and associated method generally relate to data writing and more specifically to writing data to a rotating media. An embodiment of such an apparatus comprises a slider body, a transducer and a write driver. The transducer comprises a writer. The write driver is integrated on the slider body, and directly connected to the writer.
摘要翻译： 装置和相关方法通常涉及数据写入，更具体地涉及将数据写入旋转介质。 这种装置的实施例包括滑块体，换能器和写入驱动器。 换能器包括一个写入器。 写驱动器集成在滑块体上，并直接连接到写入器。
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公开(公告)号：US11631431B2
公开(公告)日：2023-04-18
申请号：US17856321
申请日：2022-07-01
摘要： Apparatus and method for transferring data in a data storage system, such as but not limited to a hard disc drive (HDD). An optical link is provided between an analog front end (AFE) of a data storage device controller circuit (SOC) and a preamplifier/driver circuit (preamp) mounted to a rotary actuator to transfer an analog domain signal. A selected component is extracted from the signal using a modulation element such as a micro-resonance ring (MRR) or a Mach-Zehnder Interferometer Modulation (MZM) device. The extracted component is forwarded to a processing circuit to facilitate a transfer of data between a local memory and a non-volatile memory (NVM). The optical link includes a flexible portion in a flex circuit affixed to the rotary actuator and which supports the preamp. Multiplexed read, write, and power control signals are concurrently transmitted via the optical link. The link can concurrently service multiple head-disc assemblies (HDAs).
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16.发明授权公开(公告)号：US11495249B1
公开(公告)日：2022-11-08
申请号：US17227958
申请日：2021-04-12
发明人： Ian James Gilbert , Peng Peng , Todd Michael Lammers , Tim Rausch
摘要： Two or more different recording currents are applied to a write coil of a recording head. A first of the two or more currents is a positive current and a second of the two or more currents is a negative current. In response to the application of the two or more different recording currents, a data stream is recorded to regions of a moving continuous magnetic recording medium such that each region has three or more magnetic states. The three or more magnetic states can be read from the continuous magnetic recording medium via a magnetic read transducer to recover the data stream.
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公开(公告)号：US09966100B1
公开(公告)日：2018-05-08
申请号：US15671262
申请日：2017-08-08
IPC分类号： G11B5/02 , G11B7/00 , G11B7/1263 , G11B5/012 , H01S5/042 , H01S5/0683 , G11B5/00
CPC分类号： G11B5/012 , G11B2005/0021 , H01S5/0427 , H01S5/0683
摘要： Before writing to a heat-assisted magnetic recording medium, a DC signal modulated with an AC signal is applied to a laser of a read/write head. A modulation level of an optical power sensor is measured, the optical power sensor being coupled to detect optical output of the laser in response to the modulated current. A target value of the DC signal that causes the modulation levels to reach a predetermined value between zero and a maximum value is determined and used to set a bias current for subsequent activation of the laser based.
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公开(公告)号：US09741385B1
公开(公告)日：2017-08-22
申请号：US15052477
申请日：2016-02-24
IPC分类号： G06F7/12 , G11B7/1263 , G11B5/09 , G11B20/10 , G11B5/00
CPC分类号： G11B7/1263 , G11B5/012 , G11B5/09 , G11B20/10027 , G11B2005/0021
摘要： Systems and methods of digital automatic power control are presented. A preamplifier circuit may include a digital-to-analog converter (DAC) circuit to sample a power signal, such as a from a laser power monitor. The preamplifier may store the sample in an internal preamplifier memory. The sample may be utilized to update a current output of the preamplifier that affects the power signal. These systems and methods may be particularly useful for lasers and heat-assisted magnetic recording (HAMR), which may be utilized during a read mode or a write mode of a HAMR data storage device.
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公开(公告)号：US20150055307A1
公开(公告)日：2015-02-26
申请号：US13974569
申请日：2013-08-23
IPC分类号： H05K1/18
CPC分类号： H05K1/0253 , H05K1/0224 , H05K2201/0723 , H05K2201/09236 , H05K2201/09681
摘要： A rigid multi-layer printed circuit board (PCB) has an embedded elongated conductor between opposing first and second reference planes. The first and second reference planes are formed of conductive material and are electrically isolated from the conductor by intervening insulative material. Each of the first and second reference planes have a plurality of spaced apart windows extending therethrough, the windows aligned with the elongated conductor.
摘要翻译： 刚性多层印刷电路板（PCB）在相对的第一和第二参考平面之间具有嵌入的细长导体。 第一和第二参考平面由导电材料形成，并通过介入的绝缘材料与导体电隔离。 第一和第二参考平面中的每一个具有从其延伸穿过的多个间隔开的窗口，窗口与细长导体对准。
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20.发明授权公开(公告)号：US10410668B1
公开(公告)日：2019-09-10
申请号：US16249452
申请日：2019-01-16
IPC分类号： G11B5/00 , G11B7/1263 , G11B5/09 , G11B20/18 , G11B5/012
摘要： 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.
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