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).

  • Patent number: 8824091
    Abstract: Approaches for a flying height control scheme in a hard-disk drive (HDD) device. The flying height control scheme utilizes an embedded contact sensor (ECS) to characterize the topography of a magnetic-recording disk at various flying heights of a head slider over a corresponding disk. A relation between a particular flying height and a corresponding ECS value which characterizes the media topography at that particular flying height is represented in disk topography data. The disk topography data is accessed and used for active flying height control for the head-disk interface in view of the current ECS value.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: September 2, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Saurabh Deoras, Samir Garzon, Kenichi Kuramoto, Remmelt Pit
  • Patent number: 8804263
    Abstract: Embedded contact sensor controls for use in arm electronics (AE) in a disk drive are described that provide for removing undesirable offsets between the measured voltage across the ECS resistor in the slider and the balance resistor in ECS amplifier in the arm electronics (AE), which allows increased amplification of the resulting adjusted signal without saturation. Embodiments include a Zero-Offset Circuit, which can be activated periodically or on demand to sample and hold the present DC offset voltage in the ECS amplifier signal and subtract the DC offset voltage from ECS amplifier signal. The adjusted signal can then be further amplified without saturation.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: August 12, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Samir Y. Garzon, Rehan Ahmed Zakai
  • Publication number: 20140177090
    Abstract: Approaches for a flying height control scheme in a hard-disk drive (HDD) device. The flying height control scheme utilizes an embedded contact sensor (ECS) to characterize the topography of a magnetic-recording disk at various flying heights of a head slider over a corresponding disk. A relation between a particular flying height and a corresponding ECS value which characterizes the media topography at that particular flying height is represented in disk topography data. The disk topography data is accessed and used for active flying height control for the head-disk interface in view of the current ECS value.
    Type: Application
    Filed: December 20, 2012
    Publication date: June 26, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: JOHN CONTRERAS, SAURABH DEORAS, SAMIR GARZON, KENICHI KURAMOTO, REMMELT PIT
  • Publication number: 20140153130
    Abstract: Approaches for a hard-disk drive (HDD) comprising a head slider comprising a thermoelectric embedded contact sensor. The thermoelectric embedded contact sensor may comprise a first and second conductive lead and a metallic component. The metallic component has a different Seebeck coefficient than the first and second conductive leads. A thermoelectric voltage across the metallic component is used to measure the distance between a head slider and a magnetic-recording disk without supplying an electrical current from a hard-disk drive to either of the first conductive lead or the second conductive lead.
    Type: Application
    Filed: November 30, 2012
    Publication date: June 5, 2014
    Applicant: HGST Netherlands B.V.
    Inventors: Samir Garzon, John Contreras, Lidu Huang, Gurinder Singh
  • Patent number: 8730607
    Abstract: Approaches for a hard-disk drive (HDD) comprising a head slider comprising a thermoelectric embedded contact sensor. The thermoelectric embedded contact sensor may comprise a first and second conductive lead and a metallic component. The metallic component has a different Seebeck coefficient than the first and second conductive leads. A thermoelectric voltage across the metallic component is used to measure the distance between a head slider and a magnetic-recording disk without supplying an electrical current from a hard-disk drive to either of the first conductive lead or the second conductive lead.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: May 20, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Samir Garzon, John Contreras, Lidu Huang, Gurinder Singh
  • Patent number: 8599506
    Abstract: A hard disk drive (HDD) including a slider. The slider includes a resistive temperature detector (RTD) configured to detect a temperature generated by one or more of slider spacing and contact with a media of said HDD. HDD also includes a slider signal controller configured to control bias signal of a slider with respect to a media potential, a real-time media-disk fly-height and contact detector configured to detect one or more of temperature generated by real-time media-disk slider spacing and real-time media-disk contact, and a real-time relative fly-height determiner configured to detect real-time relative fly-height of the slider based on analysis of a modulated portion of a high-frequency signal coupled to an element of the slider.
    Type: Grant
    Filed: December 31, 2009
    Date of Patent: December 3, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Bernhard E. Knigge
  • Patent number: 8553506
    Abstract: An apparatus according to one embodiment includes a near-field transducer positioned towards an air bearing surface side of the apparatus; and at least one conductor or circuit for causing heating of the near-field transducer. A method according to one embodiment includes heating the near-field transducer by passing a current through the at least one conductor or circuit; and illuminating the near-field transducer during a write operation, wherein the current does not pass through the at least one conductor or circuit for at least a majority of a time of illumination. Additional embodiments are also presented.
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: October 8, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Lidu Huang, Erhard Schreck, Barry C. Stipe
  • Patent number: 8503125
    Abstract: A method and apparatus for generating a laser signal for driving a laser used in thermal-assisted recording. A channel of a hard drive generates a high-frequency component of the laser signal—e.g., a periodic wave or series of pulses—and synchronizes the phase of the laser signal with a corresponding write data signal which controls the magnetization of data bits within the magnetic disk of the hard drive. The channel may be connected to a read/write integrated circuit via a channel interconnect. The read/write circuit may include a second phase control to compensate for any phase shift and an adder circuit to combine the transmitted high-frequency laser with a DC bias. Further, the read/write circuit may include a feedback loop for adjusting the DC bias based on environmental parameters of the hard drive such as temperature.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: August 6, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: John Contreras, Weldon Hanson, Barry C. Stipe, Rehan Zakai
  • Publication number: 20130170331
    Abstract: An apparatus according to one embodiment includes a near-field transducer positioned towards an air bearing surface side of the apparatus; and at least one conductor or circuit for causing heating of the near-field transducer. A method according to one embodiment includes heating the near-field transducer by passing a current through the at least one conductor or circuit; and illuminating the near-field transducer during a write operation, wherein the current does not pass through the at least one conductor or circuit for at least a majority of a time of illumination. Additional embodiments are also presented.
    Type: Application
    Filed: December 29, 2011
    Publication date: July 4, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: John Contreras, Lidu Huang, Erhard Schreck, Barry C. Stipe
  • Patent number: 8387176
    Abstract: A rotational mechanism for extending a sofa sleeper from an upright sitting position to a fully reclining and fully extended sleep position, having: a first rotatable member configured to rotate about a first axis; a second rotatable member configured to rotate about a second axis; a link mechanism attached to both the first and second rotatable members, the link mechanism being moveable along a length of both of the first and second rotatable members; and a drive mechanism configured to position the moveable link at positions along the length of at least one of the rotatable members such that movement of the link mechanism causes both the first and second rotatable mechanisms to rotate.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: March 5, 2013
    Assignee: Elite Leather Company
    Inventors: John A. Contreras, Michael A. Galardo
  • Publication number: 20120300599
    Abstract: A method and apparatus for generating a laser signal for driving a laser used in thermal-assisted recording. A channel of a hard drive generates a high-frequency component of the laser signal—e.g., a periodic wave or series of pulses—and synchronizes the phase of the laser signal with a corresponding write data signal which controls the magnetization of data bits within the magnetic disk of the hard drive. The channel may be connected to a read/write integrated circuit via a channel interconnect. The read/write circuit may include a second phase control to compensate for any phase shift and an adder circuit to combine the transmitted high-frequency laser with a DC bias. Further, the read/write circuit may include a feedback loop for adjusting the DC bias based on environmental parameters of the hard drive such as temperature.
    Type: Application
    Filed: May 27, 2011
    Publication date: November 29, 2012
    Inventors: John Contreras, Weldon Hanson, Barry C. Stipe, Rehan Zakai
  • Patent number: 8274756
    Abstract: Approaches for implementing a conductive gasket comprising carbon nanotubes for deployment within a sensitive environment, such as an environment containing equipment whose operation may be affected by airborne particles or electromagnetic energy. For example, a hard-disk drive (HDD) comprises an enclosure that is formed by coupling a first component, such as a cover, to a second component, such as a base, using one or more gaskets. The one or more gaskets may be constructed using a material that includes carbon nanotubes. The composition of the material used to construct the gaskets may be selected to achieve a desired electromagnetic conductivity for the gaskets. In this way, the gaskets of the enclosure of the HDD do not render the enclosure vulnerable to external electromagnetic energy and are constructed in a manner that does not introduce any harmful airborne contaminants within the protective enclosure of the HDD.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: September 25, 2012
    Assignee: HGST Netherlands B.V.
    Inventors: Albert Wallash, Ravinder Ajmani, John Contreras, Ryan Davis
  • Publication number: 20120140360
    Abstract: Approaches for integrated lead suspension that provides many benefits, such as enabling a dual stage actuator (DSA) to be used with a single layer flex with a reduced amount of crosstalk. An integrated lead suspension comprises a tail end having a plurality of conductive pads positioned thereat. The plurality of conductive pads includes a first and second dual stage actuator (DSA) pad. The first and second DSA pads are electrically coupled to a conductive member by way of conductive vias. The conductive member may be a stainless steel island. The first DSA pad conducts a signal to a first terminal at each of a plurality of dual stage actuators, while a second terminal at each of the plurality of dual stage actuators is connected to ground.
    Type: Application
    Filed: December 7, 2010
    Publication date: June 7, 2012
    Inventors: John Contreras, Nobumasa Nishiyama, Bijan Rafizadeh, Eiji Soga, Hiroyasu Tsuchida, Yiduo Zhang
  • Patent number: 8174788
    Abstract: A method for manufacturing a hard disk drive is described. The method includes providing a motor assembly, the motor assembly comprising a stationary portion and a rotatable portion for rotating a magnetic disk with respect to said stationary portion and providing a base for receiving the motor assembly. The method further includes providing an adhesive for mounting the motor assembly to said base wherein the adhesive is electrically conductive and mounting the stationary portion of the motor assembly to the base utilizing the adhesive such that the adhesive provides a low resistance path between the base and the motor assembly.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: May 8, 2012
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: John Contreras, Klaas B. Klaassen
  • Publication number: 20120033319
    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: Application
    Filed: August 6, 2010
    Publication date: February 9, 2012
    Inventors: John Contreras, Tatemi Ido, Nobumasa Nishiyama, Xinzhi Xing
  • Patent number: 8049984
    Abstract: In a method of biasing a slider, a bias voltage is generated for biasing a slider. The bias voltage is integratedly coupled to a conductive body of the slider via an existing signal path of the slider such that the slider is biased with the bias voltage. The existing signal path is primarily used for conveying another signal to or from the slider but at least sometimes conveys the bias voltage to the conductive body in an integral fashion along with another signal.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: November 1, 2011
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: John Contreras, Luiz Franca-Neto, Bernhard Knigge
  • Publication number: 20110258773
    Abstract: A rotational mechanism for extending a sofa sleeper from an upright sitting position to a fully reclining and fully extended sleep position, having: a first rotatable member configured to rotate about a first axis; a second rotatable member configured to rotate about a second axis; a link mechanism attached to both the first and second rotatable members, the link mechanism being moveable along a length of both of the first and second rotatable members; and a drive mechanism configured to position the moveable link at positions along the length of at least one of the rotatable members such that movement of the link mechanism causes both the first and second rotatable mechanisms to rotate.
    Type: Application
    Filed: April 23, 2010
    Publication date: October 27, 2011
    Applicant: Elite Leather Company
    Inventors: John A. Contreras, Michael A. Galardo
  • Patent number: 8045297
    Abstract: A flex cable comprises a base film, a first adhesive layer coupled with the base film, and at least two signal traces coupled with the first adhesive layer. The flex cable comprises a second adhesive layer coupled with the signal traces and the first adhesive layer, and a cover film coupled with the second adhesive layer. The flex cable comprises an electrically conductive layer adjacent to the signal traces, and parallel with the base film and the cover film.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: October 25, 2011
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: John Contreras, Luiz M. Franca-Neto, Jr-Yi Shen
  • Publication number: 20110157736
    Abstract: A hard disk drive (HDD) including a slider. The slider includes a resistive temperature detector (RTD) configured to detect a temperature generated by one or more of slider spacing and contact with a media of said HDD. HDD also includes a slider signal controller configured to control bias signal of a slider with respect to a media potential, a real-time media-disk fly-height and contact detector configured to detect one or more of temperature generated by real-time media-disk slider spacing and real-time media-disk contact, and a real-time relative fly-height determiner configured to detect real-time relative fly-height of the slider based on analysis of a modulated portion of a high-frequency signal coupled to an element of the slider.
    Type: Application
    Filed: December 31, 2009
    Publication date: June 30, 2011
    Inventors: John CONTRERAS, Bernhard E. Knigge
  • Publication number: 20110141618
    Abstract: Approaches for implementing a conductive gasket comprising carbon nanotubes for deployment within a sensitive environment, such as an environment containing equipment whose operation may be affected by airborne particles or electromagnetic energy. For example, a hard-disk drive (HDD) comprises an enclosure that is formed by coupling a first component, such as a cover, to a second component, such as a base, using one or more gaskets. The one or more gaskets may be constructed using a material that includes carbon nanotubes. The composition of the material used to construct the gaskets may be selected to achieve a desired electromagnetic conductivity for the gaskets. In this way, the gaskets of the enclosure of the HDD do not render the enclosure vulnerable to external electromagnetic energy and are constructed in a manner that does not introduce any harmful airborne contaminants within the protective enclosure of the HDD.
    Type: Application
    Filed: December 15, 2009
    Publication date: June 16, 2011
    Inventors: Albert Wallash, Ravinder Ajmani, John Contreras, Ryan Davis