Patents by Inventor John Contreras

John Contreras 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).

  • Publication number: 20190362744
    Abstract: Disclosed herein are circuits, architectures, and methods that provide for the control of a data storage device write head's trailing shield and main pole potential with respect to the disk using circuitry that is integrated with circuitry used to bias a spin torque oscillator (STO) apparatus. Various embodiments include slider connections with STO bias circuitry that resides in a read/write integrated circuit, which has a programmable circuit that generates a bias current with overshoot (bias kicks). Also disclosed are circuits that may be incorporated into a slider to mitigate radio-frequency interference.
    Type: Application
    Filed: August 11, 2019
    Publication date: November 28, 2019
    Applicant: Western Digital Technologies, Inc.
    Inventors: John CONTRERAS, Yunfei DING, Kuok San HO, Ian Robson MCFADYEN, Joey Martin POSS
  • Publication number: 20190315659
    Abstract: Method of making foamed gypsum slurry having 15 to 90 volume percent gas bubbles including: passing first slurry including water and on dry basis 50 to 98 wt. % calcium sulfate hemihydrate, 1 to 50 wt. % calcium carbonate, and 0.1 to 10 wt. % cellulose thickener via a first hose to a Wye connector conduit first inlet opening at Rate C and passing alum solution via a second hose to a second inlet opening of the conduit at Rate D to create combined mixed stream passing from the conduit to a static mixer for mixing for Time 3 to activate at least a portion of the calcium carbonate and alum to generate CO2 and create the foamed gypsum slurry; transferring the slurry from the mixer to a cavity between two wall boards via a third hose. Allowing the slurry in the cavity to expand, harden and dry.
    Type: Application
    Filed: March 5, 2019
    Publication date: October 17, 2019
    Inventors: David D. PELOT, Samar EMAMI, Robert H. NEGRI, Juan Carlos Ruiz Castaneda, Christopher R. NELSON, John J. ROXBURGH, Edgar R. DE LA ROSA CRUZ, Jorge A. GARCIA TORRES, Miguel Gama Goicochea, Antonio CONTRERAS, Juan HUITZIL
  • Patent number: 10424323
    Abstract: Disclosed herein are circuits, architectures, and methods that provide for the control of a data storage device write head's trailing shield and main pole potential with respect to the disk using circuitry that is integrated with circuitry used to bias a spin torque oscillator (STO) apparatus. Various embodiments include slider connections with STO bias circuitry that resides in a read/write integrated circuit, which has a programmable circuit that generates a bias current with overshoot (bias kicks). Also disclosed are circuits that may be incorporated into a slider to mitigate radio-frequency interference.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: September 24, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: John Contreras, Yunfei Ding, Kuok San Ho, Ian Robson McFadyen, Joey Martin Poss
  • Patent number: 10411670
    Abstract: Disclosed herein are printed circuit boards with at least one signal trace situated over or under a reference plane. The reference plane includes a broadband common-mode filter that comprises looping and parallel structures etched into the reference plane. The looping structure includes an even number of side arms, and the parallel structure comprises an even number of interior arms, wherein each of the side arms extends toward the parallel structure, and each of the interior arms extends toward the looping structure. The at least one signal trace is substantially parallel to the side arms and to the interior arms, and is situated between a first half of the even number of side arms and a second half of the even number of side arms and between a first half of the even number of interior arms and a second half of the even number of interior arms.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: September 10, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Xinzhi Xing, Albert Wallash, John Contreras
  • Patent number: 10283150
    Abstract: Disclosed herein are suspension assembly structures for data storage devices that include physical or virtual crossovers of the pairs of differential signal traces to improve immunity to crosstalk and other interference. In an embodiment, the suspension assembly structure comprises a first trace for carrying a first component of a current to a differential transducer on a slider, a second trace for carrying a second component of the current to the differential transducer on the slider, and third and fourth traces for providing a differential write current to a writer of the data storage device, wherein the first trace physically crosses over the second trace at a first distance from a tail of the suspension assembly structure.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: May 7, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: John Contreras, Rehan Zakai, Albert Wallash, Tzong-Shii Pan
  • Patent number: 10285259
    Abstract: Disclosed herein are printed circuit boards with embedded solenoid filters through which signal traces pass to filter unwanted noise and electromagnetic interference. A printed circuit board comprises a least three layers, a solenoid embedded within the at least three layers, and at least one trace extending through the solenoid. The insertion loss characteristics of the solenoid filter can be tuned by modifying the number of turns in the solenoid(s) and the width of the solenoid(s). The solenoid filter may comprise multiple solenoids connected in series, with adjacent solenoids having opposite wind directions. Surface components may be included on the board to tune the insertion loss further.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: May 7, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Albert Wallash, John Contreras, Ronald G. Parkinen, Xinzhi Xing, Hui He
  • Patent number: 10244618
    Abstract: Disclosed herein are printed circuit boards (PCBs) with patterned ground structure filters and data storage devices comprising such PCBs. Each PCB comprises a resonator having an L-shape or a zig-zag shape in a plane of the printed circuit board and at least one signal trace. The resonator has a first dimension and a second dimension in the plane of the printed circuit board. A portion of the at least one signal trace is situated over the resonator and is separated by a distance from the resonator by a dielectric material. In some embodiments, at least part of the portion of the at least one signal trace extends in a same direction as the first dimension (in the case of an L-shaped resonator) or tracks the zig-zag shape of the resonator (in the case of a zig-zag-shaped resonator).
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: March 26, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Albert Wallash, John Contreras, Satoshi Nakamura, Hui He
  • Publication number: 20190043531
    Abstract: Disclosed herein are suspension assembly structures for data storage devices that include physical or virtual crossovers of the pairs of differential signal traces to improve immunity to crosstalk and other interference. In an embodiment, the suspension assembly structure comprises a first trace for carrying a first component of a current to a differential transducer on a slider, a second trace for carrying a second component of the current to the differential transducer on the slider, and third and fourth traces for providing a differential write current to a writer of the data storage device, wherein the first trace physically crosses over the second trace at a first distance from a tail of the suspension assembly structure.
    Type: Application
    Filed: August 2, 2017
    Publication date: February 7, 2019
    Applicant: Western Digital Technologies, Inc.
    Inventors: John CONTRERAS, Rehan ZAKAI, Albert WALLASH, Tzong-Shii PAN
  • Publication number: 20180376580
    Abstract: Disclosed herein are printed circuit boards with at least one signal trace situated over or under a reference plane. The reference plane includes a broadband common-mode filter that comprises looping and parallel structures etched into the reference plane. The looping structure includes an even number of side arms, and the parallel structure comprises an even number of interior arms, wherein each of the side arms extends toward the parallel structure, and each of the interior arms extends toward the looping structure. The at least one signal trace is substantially parallel to the side arms and to the interior arms, and is situated between a first half of the even number of side arms and a second half of the even number of side arms and between a first half of the even number of interior arms and a second half of the even number of interior arms.
    Type: Application
    Filed: June 27, 2017
    Publication date: December 27, 2018
    Applicant: Western Digital Technologies, Inc.
    Inventors: Xinzhi XING, Albert WALLASH, John CONTRERAS
  • Publication number: 20180376583
    Abstract: Disclosed herein are printed circuit boards with embedded solenoid filters through which signal traces pass to filter unwanted noise and electromagnetic interference. A printed circuit board comprises a least three layers, a solenoid embedded within the at least three layers, and at least one trace extending through the solenoid. The insertion loss characteristics of the solenoid filter can be tuned by modifying the number of turns in the solenoid(s) and the width of the solenoid(s). The solenoid filter may comprise multiple solenoids connected in series, with adjacent solenoids having opposite wind directions. Surface components may be included on the board to tune the insertion loss further.
    Type: Application
    Filed: June 23, 2017
    Publication date: December 27, 2018
    Applicant: Western Digital Technologies, Inc.
    Inventors: Albert WALLASH, John CONTRERAS, Ronald G. PARKINEN, Xinzhi XING, Hui HE
  • Publication number: 20170295644
    Abstract: Disclosed herein are printed circuit boards (PCBs) with patterned ground structure filters and data storage devices comprising such PCBs. Each PCB comprises a resonator having an L-shape or a zig-zag shape in a plane of the printed circuit board and at least one signal trace. The resonator has a first dimension and a second dimension in the plane of the printed circuit board. A portion of the at least one signal trace is situated over the resonator and is separated by a distance from the resonator by a dielectric material. In some embodiments, at least part of the portion of the at least one signal trace extends in a same direction as the first dimension (in the case of an L-shaped resonator) or tracks the zig-zag shape of the resonator (in the case of a zig-zag-shaped resonator).
    Type: Application
    Filed: June 23, 2017
    Publication date: October 12, 2017
    Applicant: Western Digital Technologies, Inc.
    Inventors: Albert WALLASH, John CONTRERAS, Satoshi NAKAMURA, Hui HE
  • Patent number: 9570096
    Abstract: A method and apparatus is provided for extending a read bandwidth and increasing a high-frequency signal-to-noise ratio (SNR) of a front-end of a read path of a hard disk drive (HDD) by introducing a high impedance section at the front-end of the read path. The high impedance section may mitigate capacitive effects found at the front-end of the read path, thereby improving signal transfer by extending the read bandwidth.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: February 14, 2017
    Assignee: HGST NETHERLANDS B.V.
    Inventors: John Contreras, Tatemi Ido, Nobumasa Nishiyama, Xinzhi Xing
  • Patent number: 9564163
    Abstract: A method, apparatus, and system are provided for implementing dual partially independent flyheight control (TFC) for hard disk drives (HDDs). A dual thermal flyheight control (TFC) includes a series connected first heater resistor and a second heater resistor connected between a pair of wires. A capacitor is connected in parallel with the first heater resistor providing a frequency dependent shunt to the parallel connected first heater resistor. TFC electrical bias signals are applied to the first heater resistor and second heater resistor carried by the pair of wires. For example, the TFC electrical bias signals include high frequency electrical signals including a frequency range between 1 MHz and 100 MHz having a set amplitude in a voltage range between 0 and 7 Volts, and/or DC current signal.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: February 7, 2017
    Assignee: Western Digital Technologies, Inc.
    Inventors: John Contreras, Ian Robson McFadyen, Erhard Schreck
  • Publication number: 20160293194
    Abstract: A method, apparatus, and system are provided for implementing dual partially independent flyheight control (TFC) for hard disk drives (HDDs). A dual thermal flyheight control (TFC) includes a series connected first heater resistor and a second heater resistor connected between a pair of wires. A capacitor is connected in parallel with the first heater resistor providing a frequency dependent shunt to the parallel connected first heater resistor. TFC electrical bias signals are applied to the first heater resistor and second heater resistor carried by the pair of wires. For example, the TFC electrical bias signals include high frequency electrical signals including a frequency range between 1 MHz and 100 MHz having a set amplitude in a voltage range between 0 and 7 Volts, and/or DC current signal.
    Type: Application
    Filed: April 3, 2015
    Publication date: October 6, 2016
    Inventors: John Contreras, Ian Robson McFadyen, Erhard Schreck
  • Patent number: 9280993
    Abstract: A method, apparatus, and system for implementing enhanced asymmetric degauss control for a write head for hard disk drives. A degauss period is provided at the end of a write. The write head is driven asymmetrically with respect to the positive and negative driving currents during the degauss period. The average value of the write current during the degauss period is non-zero.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: March 8, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Zhen Jin, Yuanpeng Li, Xiaoyu Sui
  • Patent number: 9275664
    Abstract: A flex cable with a shielding layer for use in a disk drive is described. The flex cable connects the actuator to the system electronics. The flex cable has a shielding layer that provides RF shielding for the embedded signal traces. In embodiments the shielding layer is connected to the baseplate or device enclosure ground at one or more selected points on the bracket end of the flex cable that are separated from the signal paths. Embodiments of the shielding layer include rows of apertures or windows that are aligned with selected signal traces such as the read and write signal traces and serve to maintain the desired impedance in the read and write signal traces. In one embodiment the shielding layer extends over a selected portion of the flex cable that includes the bracket end and the area under the first stiffener.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: March 1, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Nobumasa Nishiyama, Albert Wallash
  • Patent number: 9275656
    Abstract: Disk drives with a Channel System and Write Driver Preamp architecture that dynamically adjusts the write driver's signal wave-shape depending on the write data signal pattern are described. The wave-shape control signal is generated in the Channel and transmitted to the Write Driver Preamp. Embodiments of the invention provide discrete n-level overshoot amplitude control using amplitude-level modulated (AML) signal. One embodiment implements a look-ahead strategy overshoot amplitude control where the overshoot amplitude for each transition depends only on the subsequent (following) bits in the data stream and not on any previously recorded data.
    Type: Grant
    Filed: July 20, 2015
    Date of Patent: March 1, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Samir Y. Garzon, Weldon Mark Hanson, Alexander Taratorin
  • Patent number: 9218822
    Abstract: Interconnect and preamplifier designs are described for use in a disk drive with a common signal return lead system that interconnects a plurality of read transducers (readers) in a slider through the suspension to the preamplifier mounted on the actuator. Preamplifier embodiments have an isolated differential amplifier for each of the plurality of readers in the slider. The set of signal traces in the suspension include a common signal return lead for the plurality of readers in the slider. A preamplifier circuit design according to an embodiment of the invention includes isolated amplifiers for each reader with a separate bias source and power supply isolation elements for both power supply polarities for reduced crosstalk signal and noise between amplifiers.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: December 22, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Samir Y. Garzon, Rehan Ahmed Zakai
  • Patent number: 9196266
    Abstract: An interconnect between the read/write circuitry and the read/write head in a magnetic recording hard disk drive (HDD) for two-dimensional magnetic recording (TDMR) has the read sensor signal lines located on a lower level of a bi-level structure of conductive lines. Common return lines are located on an upper level above the signal lines and on the lower level between the signal lines. All of the return lines on the upper level are connected to one another by cross-connect lines, and vias are located along the interconnect and connect the upper return lines with the lower return lines and with the ground plane of the interconnect's electrically conductive substrate. The interconnect is a coaxial-like interconnect because the return lines are located around each signal line and thus shield each signal line from the other signal lines, much like the outer conductive shield of a coaxial cable.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: November 24, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Albert John Wallash, Rehan Ahmed Zakai
  • Patent number: 9165596
    Abstract: A disk drive has multiple preamplifiers (preamps) connected to the system-on-a-chip (SOC) by a common transmission line with resistors between the preamps and the SOC. Each preamp includes a read resistor at the output of each read amplifier, and a write resistor at the input of each write driver. The resistors may be programmable resistors located in the preamps. The read resistors are at the source of the signal to the transmission line and the write resistors are at the termination of the signal from the transmission line. The read and write resistors provide impendence matching with the transmission line and the SOC when one of the preamps is selected as active, which enables the SOC to operate seamlessly with a common transmission line connected to all preamps.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: October 20, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Nobumasa Nishiyama, Joey Martin Poss, Tuyen Van Trinh, Craig K. Yanagisawa, Yasunori Kubo