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公开(公告)号：US10381036B1
公开(公告)日：2019-08-13
申请号：US15136829
申请日：2016-04-22
Applicant: Seagate Technology LLC
Inventor： Todd Michael Lammers , Abdelkrim Tatah , Tim Rausch , Robert Matousek
Abstract: Systems and methods of laser bias calibration are presented. A preamplifier circuit may include a laser voltage monitor circuit and a laser bias control circuit configured to automatically adjust an output laser bias threshold voltage based on a monitored laser voltage. The laser bias control circuit may include a first differentiator circuit, a second differentiator circuit, and a threshold detection circuit. The preamplifier circuit may be utilized in a heat assisted magnetic recording device.
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22.发明授权公开(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.
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公开(公告)号：US10164592B1
公开(公告)日：2018-12-25
申请号：US14833883
申请日：2015-08-24
Applicant: Seagate Technology LLC
Inventor： Robert Matousek , Todd Michael Lammers , Thomas Lee Schick
Abstract: A preamplifier may have a freeze bit that when set, puts the preamplifier in a static state, which prevents the preamplifier from implementing subsequent programming commands. The freeze state may continue until an unfreeze bit is programmed. In a multiple preamplifier system, preamplifiers can be differently and individually configured over a single interface. Preamplifiers may be released from the static state (frozen) by either programming the unfreeze bit (which can release all of the preamps) or by programming the freeze bit to a “0” state (releases the individual preamp). An inversion control circuit can allow inversion of a control signal to a preamplifier. The inversion control circuit may be enabled and disabled based on a physical conductive connection to a logic high voltage or a logic low voltage. One or more programmable control lines can determine whether the inversion function is activated when the inversion control circuit is enabled.
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公开(公告)号：US10152997B1
公开(公告)日：2018-12-11
申请号：US15660832
申请日：2017-07-26
Applicant: Seagate Technology LLC
Inventor： Alfredo Sam Chu , Todd Michael Lammers , Thomas Lee Schick , Robert Matousek
Abstract: Systems and methods of laser bias calibration are presented. A preamplifier circuit may configure a laser current supplied to a laser emitter to be a first laser current of the plurality of laser currents during the writing of one or more first sectors. The preamplifier may further detect one or more gaps in a write power signal while the laser current of the laser emitter is configured to be the first laser current. In response to the detection of the one or more gaps in the write power signal, the preamplifier may configure the laser current supplied to the laser emitter to be a second laser current of the plurality of laser currents during the writing of one or more second sectors. The preamplifier circuit may be utilized in a heat assisted magnetic recording device.
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Patent Agency Ranking
25.发明申请公开(公告)号：US20180114542A1
公开(公告)日：2018-04-26
申请号：US15671262
申请日：2017-08-08
Applicant: Seagate Technology LLC
Inventor： Tim Rausch , Edward Charles Gage , Joshua Ward Christensen , Todd Michael Lammers
IPC: G11B7/1263 , H01S5/0683 , G11B5/012 , H01S5/042 , G11B5/00
CPC classification number: G11B5/012 , G11B2005/0021 , H01S5/0427 , H01S5/0683
Abstract: 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：US09241400B2
公开(公告)日：2016-01-19
申请号：US13974569
申请日：2013-08-23
Applicant: Seagate Technology LLC
Inventor： John Wayne Shaw , Jacob Charles Matousek , Todd Michael Lammers
IPC: H05K1/02
CPC classification number: H05K1/0253 , H05K1/0224 , H05K2201/0723 , H05K2201/09236 , H05K2201/09681
Abstract: 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.
Abstract translation: 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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公开(公告)号：US09147431B2
公开(公告)日：2015-09-29
申请号：US13960443
申请日：2013-08-06
Applicant: Seagate Technology LLC
Inventor： Todd Michael Lammers , Robert Matousek , William Michael Radich
CPC classification number: G11B20/10268 , G11B5/556
Abstract: Method and apparatus for decoding data, such as from a rotatable magnetic recording medium. In accordance with some embodiments, a plurality of sensors is provided, with each sensor configured to generate a sense signal from an adjacent pattern. A processing circuit is configured to decode data from the adjacent pattern using the generated sense signals.
Abstract translation: 用于解码数据的方法和装置，例如从可旋转的磁记录介质。 根据一些实施例，提供多个传感器，其中每个传感器被配置为从相邻图案生成感测信号。 处理电路被配置为使用所产生的感测信号来解码来自相邻图案的数据。
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公开(公告)号：US20150103442A1
公开(公告)日：2015-04-16
申请号：US14575288
申请日：2014-12-18
Applicant: Seagate Technology LLC
Inventor： Mark Anthony Gubbins , Todd Michael Lammers
CPC classification number: G11B5/09 , G11B5/10 , G11B5/1278 , G11B5/3133 , G11B5/4833 , G11B5/4853 , G11B5/6005 , G11B5/6082
Abstract: 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.
Abstract translation: 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：US20150043098A1
公开(公告)日：2015-02-12
申请号：US13960443
申请日：2013-08-06
Applicant: Seagate Technology LLC
Inventor： Todd Michael Lammers , Robert Matousek , William Michael Radich
IPC: G11B20/10
CPC classification number: G11B20/10268 , G11B5/556
Abstract: Method and apparatus for decoding data, such as from a rotatable magnetic recording medium. In accordance with some embodiments, a plurality of sensors is provided, with each sensor configured to generate a sense signal from an adjacent pattern. A processing circuit is configured to decode data from the adjacent pattern using the generated sense signals.
Abstract translation: 用于解码数据的方法和装置，例如从可旋转的磁记录介质。 根据一些实施例，提供多个传感器，其中每个传感器被配置为从相邻图案生成感测信号。 处理电路被配置为使用所产生的感测信号来解码来自相邻图案的数据。
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