Patents by Inventor Jason W. Riddering
Jason W. Riddering has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10366719Abstract: A clearance heater of a write head is engaged with a boosted current that exceeds a steady-state current. The steady-state current causes the write head to maintain a desired clearance over a disk during writing, the boosted current being applied before a start of the writing. The boosted current is monotonically decreased before the start of the writing and the steady-state current is applied to the heater after the start of the writing.Type: GrantFiled: March 20, 2018Date of Patent: July 30, 2019Assignee: Seagate Technology LLCInventors: Jason W. Riddering, Dustin Mark Cvancara, Kenneth A. Haapala, Eric John McCalla, Wenzhong Zhu, Bin Huang
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Patent number: 10083716Abstract: A heat-assisted magnetic recording head is moved relative to a magnetic recording medium. The medium comprises a plurality of sectors. The sectors define a plurality of sector groups distributed around a circumference of the medium. The sectors of each sector group are written using different operational currents supplied to a laser diode of the head such that at least one sector from each sector group is written using one of the different operational currents. For each of the different operational currents, an average write performance metric is calculated for all sectors written at each of the different operational currents. A particular operational current of the different operational currents is determined that results in a best average write performance metric.Type: GrantFiled: August 16, 2017Date of Patent: September 25, 2018Assignee: Seagate Technology LLCInventors: Alfredo Sam Chu, Drew Michael Mader, Joshua Ward Christensen, Jason W. Riddering
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Patent number: 9990950Abstract: An apparatus comprises a slider configured for heat-assisted magnetic coupled to a controller. The slider comprises a writer, a heater, a near-field transducer, and an optical waveguide for communicating light from a laser diode to the near-field transducer. The controller is configured to set a target pre-write clearance of the slider prior to performing a write operation, set a target write clearance of the slider for performing the write operation, and determine a difference between the target pre-write and write clearances to define a target pre-write clearance offset. The controller is also configured to measure, for a plurality of different target pre-write clearance offsets, a writability metric for the slider while sweeping a laser diode current, and adjust the target pre-write clearance offset so that the writability metric reaches a predetermined threshold. The controller is further configured to perform subsequent write operations using the adjusted target pre-write clearance offset.Type: GrantFiled: July 17, 2017Date of Patent: June 5, 2018Assignee: Seagate Technology LLCInventors: Drew Michael Mader, Steven J. Kimble, Jason W. Riddering
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Patent number: 9875764Abstract: A slider is configured for heat-assisted magnetic recording to a magnetic recording medium. A low- or non-modulation interface is defined between the slider and the medium. A contaminant is present on the slider and between the slider and the medium. A controller is configured to control the slider to dislodge the contaminant from the slider by performing modulation-based contact detection at a location of the medium where modulation-based contact detection can accurately detect head-medium contact. The controller is also configured to perform friction-based contact detection using the slider devoid of the contaminant.Type: GrantFiled: February 14, 2017Date of Patent: January 23, 2018Assignee: SEAGATE TECHNOLOGY LLCInventor: Jason W. Riddering
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Patent number: 9824699Abstract: A lumped-parameter function ? is determined that represents an average power dissipated by a write transducer when writing a signal to a magnetic recording medium. Temperatures of the write transducer are measured while varying the parameters to determine constants of the function ?. The function ? is used to adjust power applied to a clearance control heater when writing to the magnetic recording medium.Type: GrantFiled: January 31, 2017Date of Patent: November 21, 2017Assignee: SEAGATE TECHNOLOGY LLCInventors: Huazhou Lou, Jason W. Riddering, Richard Edward Martin, Michael P. DeFeo
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Patent number: 9595277Abstract: Method and apparatus for controlling the fly height of a transducer. In some embodiments, a data pattern is written to a rotating data recording surface using a transducer having a write element, a read element and a thermal assist energy source. A first protrusion distance for the read element induced by operation of the energy source is determined responsive to first and second readback amplitudes obtained from the data pattern using different first and second power levels applied to the energy source. A second protrusion distance for the write element induced by the energy source is determined responsive to the first protrusion distance.Type: GrantFiled: July 13, 2015Date of Patent: March 14, 2017Assignee: Seagate Technology LLCInventors: Huazhou Lou, Jason W. Riddering
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Publication number: 20170018284Abstract: Method and apparatus for controlling the fly height of a transducer. In some embodiments, a data pattern is written to a rotating data recording surface using a transducer having a write element, a read element and a thermal assist energy source. A first protrusion distance for the read element induced by operation of the energy source is determined responsive to first and second readback amplitudes obtained from the data pattern using different first and second power levels applied to the energy source. A second protrusion distance for the write element induced by the energy source is determined responsive to the first protrusion distance.Type: ApplicationFiled: July 13, 2015Publication date: January 19, 2017Inventors: Huazhou Lou, Jason W. Riddering
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Patent number: 9236081Abstract: A method includes setting a heat assisted magnetic recording (HAMR) device located in a data storage system having a laser to an operating temperature. A threshold laser current is determined. An optimal laser current is determined. The threshold laser current and the optimal laser current are stored in memory. The steps of determining a threshold laser current, determining an optimal laser current and storing the threshold laser current and the optimal laser current into the calibration table are repeated until acceptable device performance is achieved at more than one operating temperature.Type: GrantFiled: March 31, 2015Date of Patent: January 12, 2016Assignee: Seagate Technology LLCInventors: Alfredo S. Chu, Jason W. Riddering, Drew M. Mader, Huazhou Lou, Pu-Ling Lu
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Patent number: 7742255Abstract: Apparatus and method for head-disc interface (HDI) modal response monitoring. A sensing element disposed on a rigid actuator arm is mechanically impedance matched to a head-disc interface (HDI) supported by the actuator arm to resonate at a predetermined frequency corresponding to at least one disturbance associated with the HDI.Type: GrantFiled: July 11, 2007Date of Patent: June 22, 2010Assignee: Seagate Technology LLCInventors: Antanas Daugela, Subra Nagarajan, Jason W. Riddering, Neal F. Gunderson, John S. Wright, Stefan A. Ionescu, Rick P. Freeman, Erick J. Lindquist, Andrew R. Motzko, Zine Eddine Boutaghou
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Publication number: 20090015962Abstract: Apparatus and method for head-disc interface (HDI) modal response monitoring. A sensing element disposed on a rigid actuator arm is mechanically impedance matched to a head-disc interface (HDI) supported by the actuator arm to resonate at a predetermined frequency corresponding to at least one disturbance associated with the HDI.Type: ApplicationFiled: July 11, 2007Publication date: January 15, 2009Applicant: Seagate Technology LLCInventors: ANTANAS DAUGELA, Subra Nagarajan, Jason W. Riddering, Neal F. Gunderson, John S. Wright, Stefan A. Ionescu, Rick P. Freeman, Erik J. Lindquist, Andrew R. Motzko, Zine Eddine Boutaghou
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Patent number: 7123448Abstract: The present invention is an air bearing slider comprising a transducer for communicating with a disc; a composite slider body with a front portion composed of a first material and a rear portion composed of a second material; an air bearing surface defined on a disc opposing face of the composite slider body, where the air bearing surface comprises the front portion and the rear portion; and a transducer basecoat portion attached to the rear portion of the slider body and containing the transducer. During flight, the mechanical close point of the slider body is at the transducer pole tip.Type: GrantFiled: June 19, 2001Date of Patent: October 17, 2006Assignee: Seagate Technology, LLCInventors: Zine-Eddine Boutaghou, Jason W. Riddering, Anthony P. Sannino
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Patent number: 7068449Abstract: A disc drive data storage system is disclosed that includes a disc storage medium having a disc surface. The system also includes an armature and a slider coupled to the armature. The slider supports a transducer head that communicates with the disc storage medium. The slider flies above the disc surface and positions the transducer head proximate the disc surface. Data representing a topography map of the disc surface is stored in a memory. A controller controls the fly height of the slider above the disc surface as a function of the topography map of the disc surface.Type: GrantFiled: April 30, 2002Date of Patent: June 27, 2006Assignee: Seagate Technology LLCInventors: Jason W. Riddering, Wayne A. Bonin, Zine-Eddine Boutaghou
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Patent number: 7000459Abstract: A micromechanical assembly couples to a positioning member and to a body having an aerodynamic surface subject to aerodynamic forces. The micromechanical assembly comprises a substrate including a flexible beam joining a first substrate portion that is attachable to the positioning member to a second substrate portion that is attachable to the body. The substrate includes a substrate surface extending at least over the flexible beam. A lithographic pattern is formed on the substrate surface. The lithographic pattern includes at least a first impedance element that senses flexing of the flexible beam. Contact pads are coupled to the lithographic pattern for coupling to a flex measurement circuit.Type: GrantFiled: June 17, 2003Date of Patent: February 21, 2006Assignee: Seagate Technology LLCInventors: Jason W. Riddering, Wayne A. Bonin, Zine-Eddine Boutaghou, Roger L. Hipwell, Jr.
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Patent number: 6760182Abstract: A disc drive includes a disc, a beam extending from the voice coil motor to a gimbal point to provide a load force, and a slider that flies over the disc with a pole tip protrusion that has an ambient temperature sensitivity. The disc drive also includes a strut with a yielding bend section (YBS). Deposits of shape memory alloys (SMA) having different first and second transformation temperature ranges are deposited on the yielding bend section (YBS) and effectively reduce an ambient temperature sensitivity of the pole tip protrusion.Type: GrantFiled: February 18, 2002Date of Patent: July 6, 2004Assignee: Seagate Technology LLCInventors: Gary E. Bement, Mark A. Chapin, Michael D. Mundt, Jason W. Riddering
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Patent number: 6700724Abstract: A disc drive includes a head with an air bearing surface that provides a fly height spacing. A fly height spacing control system provides a control signal to a head electrical connection on a head and a disco electrical connection on a disc. Fly height is controlled electrostatically. A disconnect circuit couples the control signal to the disc electrical connection. The disconnect circuit provides a disconnection of the control signal when contact is sensed. A contact sensor senses an electrical current component of the control signal that indicates contact between the head and the disc.Type: GrantFiled: April 9, 2002Date of Patent: March 2, 2004Assignee: Seagate Technology LLCInventors: Jason W. Riddering, Lee C. Knippenberg
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Publication number: 20040007076Abstract: A micromechanical assembly couples to a positioning member and to a body having an aerodynamic surface subject to aerodynamic forces. The micromechanical assembly comprises a substrate including a flexible beam joining a first substrate portion that is attachable to the positioning member to a second substrate portion that is attachable to the body. The substrate includes a substrate surface extending at least over the flexible beam. A lithographic pattern is formed on the substrate surface. The lithographic pattern includes at least a first impedance element that senses flexing of the flexible beam. Contact pads are coupled to the lithographic pattern for coupling to a flex measurement circuit.Type: ApplicationFiled: June 17, 2003Publication date: January 15, 2004Applicant: Seagate Technology LLCInventors: Jason W. Riddering, Wayne A. Bonin, Zine-Eddine Boutaghou, Roger L. Hipwell
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Patent number: 6654206Abstract: A slider having contact protection for ultra-low fly heights. The contact protection includes contact pads having an ultra-low height dimension to reduce friction and damage for intermittent contact for ultra-low fly height applications.Type: GrantFiled: July 13, 2001Date of Patent: November 25, 2003Assignee: Seagate Technology LLCInventors: Mary Cynthia Hipwell, Jason W. Riddering, Jorge V. Hanchi, Anthony P. Sannino, Zine-Eddine Boutaghou
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Publication number: 20030043491Abstract: A disc drive includes a head with an air bearing surface that provides a fly height spacing. A fly height spacing control system provides a control signal to a head electrical connection on a head and a disco electrical connection on a disc. Fly height is controlled electrostatically. A disconnect circuit couples the control signal to the disc electrical connection. The disconnect circuit provides a disconnection of the control signal when contact is sensed. A contact sensor senses an electrical current component of the control signal that indicates contact between the head and the disc.Type: ApplicationFiled: April 9, 2002Publication date: March 6, 2003Inventors: Jason W. Riddering, Lee C. Knippenberg
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Patent number: 6529347Abstract: A disc drive slider includes a slider body and a rail formed on the slider body. The rail includes a bearing surface which faces a surface of a disc. A textured portion is formed on the bearing surface of the rail. Pads are deposited on the textured portions. The pads operate to reduce stiction, dynamic friction, and the likelihood of damage to the slider or the surface of the disc due to contact therebetween.Type: GrantFiled: August 24, 2001Date of Patent: March 4, 2003Assignee: Seagate Technology LLCInventors: Mary C. Hipwell, Jason W. Riddering, Jorge V. Hanchi, Lance E. Stover, Timothy W. Stoebe, Brian W. Karr, Jianxin Zhu
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Publication number: 20030011915Abstract: A disc drive data storage system is disclosed that includes a disc storage medium having a disc surface. The system also includes an armature and a slider coupled to the armature. The slider supports a transducer head that communicates with the disc storage medium. The slider flies above the disc surface and positions the transducer head proximate the disc surface. Data representing a topography map of the disc surface is stored in a memory. A controller controls the fly height of the slider above the disc surface as a function of the topography map of the disc surface.Type: ApplicationFiled: April 30, 2002Publication date: January 16, 2003Inventors: Jason W. Riddering, Wayne A. Bonin, Zine-Eddine Boutaghou