Patents Examined by Hoa T. Nguyen
  • Patent number: 8644120
    Abstract: An optical information device used with a grooveless multilayer disc including multiple recording layers used to record and reproduce information signals and a guide layer dedicated to detect tracking error signals (TES) can always stably detect the TESs when the distance between the recording layer and guide layer varies due to selection of a target recording layer. For example, a plurality of light spots for detecting the TESs are formed by a holographic grating on the guide layer, but are defocused with respect to each other. The TESs are detected individually from the respective light spots. The TESs are subjected to an addition operation to be a signal for tracking control, thereby extraordinarily increasing the defocus dynamic range of the TESs.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: February 4, 2014
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventor: Kunikazu Ohnishi
  • Patent number: 8638519
    Abstract: A system including a monitoring module configured to monitor whether, during a first predetermined period, at least one of a read operation, a write operation, or a seek operation is performed on a platter of a storage device in response to the platter of the storage device rotating at a first speed. A speed control module is configured to rotate the platter of the storage device at a second speed in response to none of the read operation, the write operation, or the seek operation being performed on the platter of the storage device during the first predetermined period. The second speed is (i) less than the first speed, and (ii) greater than zero. None of the read operation, the write operation, or the seek operation is performed on the platter of the storage device in response to the platter of the storage device rotating at the second speed.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: January 28, 2014
    Assignee: Marvell International Ltd
    Inventors: Edy Susanto, Foo Leng Leong, Cheng Yong Teoh
  • Patent number: 8634282
    Abstract: An optical information reproducing apparatus and an optical information reproducing method using the same are provided. The optical information reproducing apparatus includes: a reference beam providing unit which inputs a reference beam to a reproduction recording area to be reproduced and a peripheral recording area around the reproduction recording area on an optical information recording medium, a peripheral beam detecting unit which transmits a reproduction beam reproduced from the reproduction recording area in response to the reference beam and detects a peripheral beam reproduced from the peripheral recording area, a tracking servo unit which analyzes optical information of the detected peripheral beam and controls a tracking position, and a reproduction beam detecting unit which detects the reproduction beam having pass through the peripheral beam detecting unit.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: January 21, 2014
    Assignee: Maple Vision Technologies Inc.
    Inventors: Hak Sun Kim, Pil Sang Yoon, Eui Seok Hwang
  • Patent number: 8630070
    Abstract: According to one embodiment, there is provided a magnetic head for a three-dimensional magnetic recording/reproducing apparatus, the head executing reading from or writing to a recording medium, utilizing a magnetic resonance, the medium including stacked layers formed of magnetic substances having different resonance frequencies, the head comprising a spin torque oscillation unit and auxiliary magnetic poles. The unit is operable to simultaneously oscillate at a plurality of frequencies to cause the magnetic resonance, when reading or writing. The magnetic poles assist the unit, when reading or writing. Further, according to another embodiment, there is provided a recording magnetic head using a high-frequency assist method and comprising a microwave magnetic field applying unit and a recording magnetic pole. The unit executes writing to a recording medium, and is formed of a plurality of spin torque oscillation elements having phases thereof synchronized. The magnetic pole assists the writing.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: January 14, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Rie Sato, Koichi Mizushima
  • Patent number: 8625231
    Abstract: Embodiments of the invention include data storage system with a servo system with a VGA feedback loop that corrects gain errors for servo bursts arising from track phase misalignment and difference in frequencies between AGC and servo bursts for seamed and seamless servo patterns. After the servo fields have been written as part of the manufacturing process, in one embodiment measurements of phase misalignment are made and recorded in nonvolatile memory for use during normal operation of the drive. One embodiment includes measuring misalignment using relative signal magnitudes from test bursts with various linear densities written in a data area during the self-servo writing process. In an alternative embodiment the measurements of phase misalignment can be made real-time during normal operation of the drive.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: January 7, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Abhishek Dhanda, Toshiki Hirano, Tetsuo Semba
  • Patent number: 8611040
    Abstract: A disk drive is disclosed comprising a head, a disk surface, and a dual stage actuator (DSA) servo loop comprising a voice coil motor (VCM) servo loop and a microactuator servo loop operable to actuate the head over the disk surface. A microactuator compensator in the microactuator servo loop is disabled, a sinusoid is injected into a control signal applied to the microactuator, and coefficients of a corresponding sinusoidal response in a DSA error signal of the DSA servo loop is measured. The sinusoid is injected into a model of the microactuator to generate a compensation signal. A gain of the microactuator is adjusted based on a VCM error signal and the coefficients of the sinusoidal response in the DSA error signal.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: December 17, 2013
    Assignee: Western Digital Technologies, Inc.
    Inventors: Wei Xi, Young-Hoon Kim
  • Patent number: 8611038
    Abstract: A tape drive system according to one embodiment includes a magnetic head having at least one servo sensor; a tape motion controller; a fine actuator; a skew actuator; a coarse actuator; and a control. The control is configured to perform various operations that help account for vibrations that effect track-following a servo track when operating a tape drive. Additional systems, methods and computer program products are also described.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: December 17, 2013
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Reed A. Hancock, Tomoko Taketomi
  • Patent number: 8605384
    Abstract: A disk drive is disclosed comprising a head, a disk surface, and a voice coil motor (VCM) and a microactuator operable to actuate the head over the disk surface. A sensitivity of the microactuator is periodically measured over a lifetime of the microactuator. Each measured sensitivity is stored in a timeline log, wherein the timeline log represents a degradation curve of the microactuator over the lifetime of the microactuator.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: December 10, 2013
    Assignee: Western Digital Technologies, Inc.
    Inventors: Yanning Liu, Chuanwen Ji, Duc T. Phan, Ming Ying Wang
  • Patent number: 8605382
    Abstract: A disk drive to load a head to a load/unload (LUL) zone of a disk is disclosed. The disk drive comprises an actuator including a head; a disk having a plurality of tracks; and a processor to control the movement of the actuator and the head relative to the disk. The processor may further: measure a back electromagnetic force (BEMF) of a spindle stator of a spindle motor after turning off the spindle motor; identify a modulation feature of the BEMF that indicates an identifiable circumferential position; command the storage the modulation feature of the BEMF; and control loading the head onto the LUL zone of the disk when the modulation feature is matched.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: December 10, 2013
    Assignee: Western Digital Technologies, Inc.
    Inventors: Michael L. Mallary, Donald Brunnett, Diep L. Nguyen, Gerardo A. Bertero
  • Patent number: 8604364
    Abstract: A high dimensional touchpad (HDTP) controls a variety of computer windows systems and applications by detecting a user's finger movement in the left-right, forward-backward, roll, pitch, yaw, and downward pressure directions. Measurements obtained from the touchpad of at least two attributes of finger movement at two different time intervals are used to provide a first and a second finger position attribute used to control an application on an electronic device. The finger roll angle is determined by detecting the edge and the peak region of a finger contact area. Also, a visual color displayed in an application operating on an electronic device is controlled by a measured-angle value of a finger in contact with a touchpad.
    Type: Grant
    Filed: August 15, 2009
    Date of Patent: December 10, 2013
    Inventors: Steven H. Simon, Andrew D. Graham
  • Patent number: 8605379
    Abstract: A disk drive is disclosed comprising a disk comprising a plurality of servo tracks, wherein each servo track comprises a plurality of servo sectors, and a head actuated radially over the disk, wherein the head comprises a read element separated from a write element by a reader/writer gap. The head is positioned over a first servo track, and a clock is synchronized to servo data in first and second servo sectors of the first servo track. A first phase-offset of the clock is measured for the first servo sector, and a second phase-offset of the clock is measured for the second servo sector, wherein the first and second phase-offset correspond to an end of the reader/writer gap at the first servo track. The first and second phase-offset are averaged to generate an average phase-offset for the first servo track.
    Type: Grant
    Filed: September 19, 2012
    Date of Patent: December 10, 2013
    Assignee: Western Digital Technologies, Inc.
    Inventor: Zhenyu Sun
  • Patent number: 8605387
    Abstract: A thermally-assisted magnetic recording head includes a magnetic pole and a heating element. The magnetic pole has a front end face located in a medium facing surface. The magnetic pole forms on a track a distribution of write magnetic field strength that peaks at a first position on the track. The heating element forms on the track a distribution of temperature that peaks at a second position on the track. The first position is located on the trailing side relative to the second position. The front end face of the magnetic pole has a main portion and first and second extended portions. The first and second extended portions are extended in the track width direction from the main portion at positions on the leading side relative to the center of the main portion in the direction of travel of a magnetic recording medium.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: December 10, 2013
    Assignee: TDK Corporation
    Inventors: Kei Hirata, Kosuke Tanaka, Tetsuya Roppongi
  • Patent number: 8599137
    Abstract: There is provided a handheld electronic device including a support structure, a display, a navigation tool assembly and a coil. The display is located on a front face of the device and upon which graphical user interface information is displayed to the user of the device. The navigation tool assembly is coupled to the support structure and includes a navigation tool that is moveable relative to the support structure. The navigation tool is configured to control motion of a selection or position indicator on the display. The coil is coupled to the support structure. A movement of the navigation tool relative to the support structure effects induction of current through the coil.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: December 3, 2013
    Assignee: BlackBerry Limited
    Inventor: Frederic Howard Rayner
  • Patent number: 8599192
    Abstract: A LCD includes: a display panel and a signal controller. The display panel includes n pixels arranged in a matrix, wherein n is a natural number. The signal controller sequentially receives first through 2n-th pixel image signals, sequentially calculates a difference between a k-th pixel image signal and a (n+k)-th pixel image signal, recognizes the (n+k)-th pixel image signal as a motion signal when the difference is greater than a first reference value and recognizes the (n+k)-th pixel image signal as a non-motion signal when the difference is equal to or less than the first reference value, and determines whether the (n+k)-th pixel image signal is a moving-image signal based on numbers of motion signals and non-motion signals recognized. An image signal of a previous frame includes the first through n-th pixel image signals and an image signal of a current frame includes the (n+1)-th through 2n-th pixel image signals.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: December 3, 2013
    Assignee: Samsung Display Co., Ltd.
    Inventors: Bo-Ra Kim, Jae-Hyoung Park
  • Patent number: 8599516
    Abstract: A disk drive device includes: a hub on which a recording disk is to be mounted; a base member; a bearing unit configured to support the hub in a manner in which the hub can be relatively rotated with respect to the base member; an extended annular groove portion provided in part of the hub around the rotational axis of the hub; and a weight member that is installed in the extended annular groove portion to adjust a rotational balance when the recording disk is being rotated with the hub. The weight member has a fixing mechanism that is slidable, when installed, in the direction of the extended annular groove portion and that can substantially maintain a stopped state at a fixing position.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: December 3, 2013
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventor: Yuji Nishitani
  • Patent number: 8593753
    Abstract: Systems and methods for detecting touchdown of a head on a disk are provided. In one embodiment, a disk drive comprises a thermal sensor configured to sense a temperature of a head and to generate a thermal signal based on the sensed temperature. The disk drive also comprises touchdown circuit configured to receive the thermal signal, to increment a count value each time the thermal signal exceeds a thermal threshold, and to output a fault signal when the count value is equal to or exceeds a count threshold.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: November 26, 2013
    Assignee: Western Digital Technologies, Inc.
    Inventor: Kent D. Anderson
  • Patent number: 8593752
    Abstract: A HDD including write components configured to operate within an operating voltage range, charging circuitry comprising a charging capacitor. The charging capacitor includes a higher voltage when charged than the operating voltage range. The HDD also includes pulse circuitry configured to pulse power from the charging circuitry to the write components within the operating voltage range during a controlled shut down of the write components such that remaining data-sector bits are written during the controlled shut down.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: November 26, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Toshihisa Kiyonaga, Yasuhiro Iihara, Yoshiroh Amano, Yoshifumi Kataoka
  • Patent number: 8593765
    Abstract: A head gimbal assembly having a stage fixed to a head-slider. A piezoelectric element which comprises; an upper surface, a first side surface, a second side surface, a lower surface, a first electrode, a second electrode, and a gap between the first and second electrodes on the lower surface, the piezoelectric element moving the stage by extension or contraction thereof according to a voltage applied to the first and second electrodes. A transmission wiring part which has a connection pad for the piezoelectric element. A cross-connector for physically and electrically cross-connecting the first electrode and the connection pad. An adhesive fixing part which is formed from an insulating adhesive and adhesively fixes the lower surface of the piezoelectric element to the transmission wiring part, between an end of the second electrode at the gap and the cross-connector.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: November 26, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Yoshio Uematsu, Tatsumi Tsuchiya, Tadaaki Tomiyama
  • Patent number: 8582234
    Abstract: A magnetic shield is adjacent a write pole. The write pole has a body portion with a body thickness and an extension portion with parallel first and second sides that each tilt towards the magnetic shield at a predetermined angle proximal to an air bearing surface (ABS). The extension portion may be capable of enhancing a write field gradient of the magnetic shield by reducing magnetic saturation.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: November 12, 2013
    Assignee: Seagate Technology LLC
    Inventors: Eric Linville, Eric Roger Meloche, Jianhua Xue, Huaqing Yin
  • Patent number: 8559128
    Abstract: According to one embodiment, a servo pattern writing method includes: moving a head from a first one of innermost and outermost circumferences of a medium to the remainder other than the first one while controlling a position of the head in accordance with a temporary pattern preliminarily written on the medium; calculating a junction between a servo pattern to be written from the innermost circumference and a servo pattern to be written from the outermost circumference based on a movement distance of the head; first writing the servo pattern from a second one of the innermost and outermost circumferences to the junction, while controlling the position of the head in accordance with the temporary pattern; and second writing the servo pattern from the remainder other than the second one to the junction, while controlling the position of the head in accordance with the temporary pattern.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: October 15, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Noboyuki Suzuki