Means To Compensate For Defect Or Abnormal Condition Patents (Class 369/44.32)
  • Patent number: 10409028
    Abstract: A lens driving module for holding and moving a lens is provided, including a lens holder having an accommodating space, a driving coil, a plurality of first magnetic members having a longitudinal structure, a virtual plane, and a plurality of second magnetic members, wherein the lens is disposed in the accommodating space. The lens holder is disposed between the first magnetic members and between the second magnetic members. The driving coil is disposed on the lens holder and surrounds the accommodating space. The virtual plane is perpendicular to a longitudinal axis of the longitudinal structure. The projections of the driving coil and the first magnetic members on the virtual plane along the longitudinal axis of the longitudinal structure overlap each other. When a first current flows through the driving coil, the lens holder moves relative to the first and second magnetic members along a first direction.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: September 10, 2019
    Assignee: TDK TAIWAN CORP.
    Inventors: Chao-Chang Hu, Jyun-Jie Lin
  • Patent number: 10379529
    Abstract: A data processing device according to one aspect of the present invention includes a first definer configured to define a transfer function of a process which is a control target on the basis of an output value from the process and a manipulated variable of the process, an analyzer configured to analyze frequency characteristics of the output value from the process, a second definer configured to define a target sensitivity function on the basis of a sensitivity function, a first frequency band included in the frequency characteristics, and a predetermined attenuation factor, the sensitivity function being defined based on the transfer function of the process and at least one control parameter of a controller for controlling the process, and an adjuster configured to adjust the at least one control parameter to decrease a difference between the sensitivity function and the target sensitivity function.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: August 13, 2019
    Assignee: Yokogawa Electric Corporation
    Inventors: Takashi Sasaki, Hiroyuki Miyamoto, Atsushi Toyoda
  • Patent number: 10373640
    Abstract: Provided are a device and a method which are capable of performing crosstalk-removed high-quality data reproduction from a high-density recording type optical disc. The device includes a photo detector that outputs a readout signal from a reproduction track of an information recording disc, an adjacent track reproduction binary signal supply unit that outputs a binary signal (binary data) which is a reproduction signal of an adjacent track of the reproduction track, a multi-input adaptive equalizer that includes an equalizer unit that receives the readout signal from the reproduction track and an adjacent track reproduction binary signal and outputs an equalization signal by an adaptive equalization process based on an input signal, and a binarization processing unit that executes a binarization process based on the equalization signal and generates a reproduction signal of the reproduction track.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: August 6, 2019
    Assignee: SONY CORPORATION
    Inventors: Kimihiro Saito, Kenji Yamamoto, Noriaki Nishi, Junya Shiraishi, Nobuyoshi Kobayashi
  • Patent number: 10261389
    Abstract: An integrated optical beam steering device includes a planar dielectric lens that collimates beams from different inputs in different directions within the lens plane. It also includes an output coupler, such as a grating or photonic crystal, that guides the collimated beams in different directions out of the lens plane. A switch matrix controls which input port is illuminated and hence the in-plane propagation direction of the collimated beam. And a tunable light source changes the wavelength to control the angle at which the collimated beam leaves the plane of the substrate. The device is very efficient, in part because the input port (and thus in-plane propagation direction) can be changed by actuating only log2 N of the N switches in the switch matrix. It can also be much simpler, smaller, and cheaper because it needs fewer control lines than a conventional optical phased array with the same resolution.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: April 16, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Scott Skirlo, Cheryl Marie Sorace-Agaskar, Marin Soljacic, Simon Verghese, Jeffrey S. Herd, Paul William Juodawlkis, Yi Yang, Dirk Robert Englund, Mihika Prabhu
  • Patent number: 10107975
    Abstract: A method for manufacturing an optoelectronic assembly includes attaching an optical die, a first lens, a second lens, and an optical fiber to a sub-mount. The sub-mount includes a plurality of passive alignment features which aid in the passive alignment of the optical die, the first lens, and the optical fiber for attachment. The second lens is actively aligned between the first lens and the optical fiber, based on a coupling efficiency with which an optical signal emitted by the optical die is coupled into the optical fiber through the first and second lenses. The active alignment of the second lens includes calibration of at least one of a position and a degree of tilt of the second lens.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: October 23, 2018
    Assignee: Denselight Semiconductors Pte. Ltd.
    Inventors: Yee Loy Lam, Long Cheng Koh, Kian Hin Victor Teo
  • Patent number: 9843389
    Abstract: There is provided an optical medium reproduction device that optically reproduces an optical medium in which a plurality of tracks are provided, the optical medium reproduction device including: a detection unit configured to divide a cross-section of a beam returning from the optical medium into at least one channel corresponding to an outer region in a radial direction, at least one channel corresponding to a region that is different in position in a tangential direction, and a channel corresponding to the other region, and form detection signals of the channels; a multi-input equalizer unit including a plurality of equalizer units to which the detection signals of the plurality of channels are supplied, respectively, the multi-input equalizer unit being configured to calculate outputs of the plurality of equalizer units and output the outputs as an equalized signal in a manner that a phase difference between two of the regions is set to be a predetermined phase difference; and a binarization unit configure
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: December 12, 2017
    Assignee: Sony Corporation
    Inventors: Noriaki Nishi, Kimihiro Saito, Junya Shiraishi
  • Patent number: 9653111
    Abstract: An apparatus includes a storage medium operable to store a number of data tracks, a read channel circuit operable to process the data tracks read from the storage medium, and a track quality classifier circuit operable to determine a track quality metric for the data tracks read from the storage medium. The track quality metric indicates whether a corresponding one of the data tracks that has failed to successfully process in the read channel circuit can be reprocessed within a track gap period.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: May 16, 2017
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventors: Xuebin Wu, Yuqing Yang, Yang Han, Shaohua Yang
  • Patent number: 9558774
    Abstract: An apparatus includes a slider of a magnetic recording transducer comprising a plurality of electrical bond pads. A component is coupled to a pair of the electrical bond pads. A sensor is coupled to the pair of the electrical bond pads in parallel with the component. The sensor is configured to sense for one or more of thermal asperities of a magnetic recording medium, voids of the medium, spacing changes between the slider and the medium, and contact between the slider and the medium. The sensor is configured to be rendered non-functional in response to the sensor receiving a predetermined signal. The component is configured to remain operable after the sensor is rendered non-functional.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: January 31, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Declan Macken
  • Patent number: 9471141
    Abstract: Systems and approaches are provided for presenting incoming notifications to a computing device based on a determined context of the computing device. Various sensors of the device can be used to determine the context of the device with respect to a user, the state of the device itself, or the context of the device with respect to the environment in which the device is situated. The user can then be informed of received notifications in a manner likely to get the user's attention while not being overly obtrusive to the user or others within the vicinity of the user.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: October 18, 2016
    Assignee: Amazon Technologies, Inc.
    Inventors: Isaac Scott Noble, Matthew Paul Bell, Guenael Thomas Strutt
  • Patent number: 9460748
    Abstract: Disclosed herein is an optical disc apparatus capable of reading out information stored in an optical disc medium, the optical disc apparatus including: a light emitting device radiating light; an object lens converging light radiated by the light emitting device on the optical disc medium; and a control section carrying out control to shift the center position of the object lens with respect to the optical-axis position of light radiated by the light emitting device in an operation to read out information from the optical disc medium.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: October 4, 2016
    Assignees: Sony Corporation, Sony Interactive Entertainment Inc.
    Inventors: Satoshi Mimura, Shinichi Nakao
  • Patent number: 9412406
    Abstract: A tracking control device includes a signal detector that detects a tracking error signal, and a crossing direction, a crossing period and a crossing velocity of an objective lens from a detection signal of an optical detector, a tracking drive signal generator that generates a tracking drive signal on the basis of the tracking error signal, a velocity-reduction drive signal generator that generates a velocity reduction drive signal for converging the crossing velocity into a vicinity of zero on the basis of the crossing direction and the crossing period, a loop switch, and a system controller that causes to executes velocity reduction driving for driving the objective lens actuator on the basis of the velocity reduction drive signal and that controls each of the members so as to switch from the velocity reduction driving to driving for driving the objective lens actuator on the basis of the tracking drive signal.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: August 9, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yusuke Kanatake, Nobuo Takeshita
  • Patent number: 9384768
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk in which servo patterns with different writing frequencies are recorded and divided into a plurality of zones in a cross-track direction; a magnetic head that is provided for the magnetic disk; and a controller to determine whether the magnetic head cross a zone boundary between the zones of the servo patterns, according to a predicted position of the magnetic head that is corrected with reference to a phase shift time between the zones of the servo patterns.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: July 5, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Makoto Asakura
  • Patent number: 9270209
    Abstract: In a servo apparatus which comprises a motor, a shaft angle detecting unit and a controlling unit, and performs standard control of an angle position by a torque controlling method, it enables to perform driving control corresponding to a fraction multiple of a predetermined angular unit.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: February 23, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Somei Kawasaki
  • Patent number: 9245571
    Abstract: An optical disc device that reads information recorded in an optical disc medium includes an objective lens that focuses light on the optical disc medium, a spherical aberration correction mechanism that changes an amount of spherical aberration of the objective lens according to a setting value of a predetermined parameter, and an evaluation value measurement section that measures an evaluation value indicating the accuracy of reading of information from the optical disc medium. The optical disc device further includes a control section that executes adjustment processing in which the control section carries out plural times of measurement of the evaluation value by the evaluation value measurement section concurrently with changing the amount of spherical aberration of the objective lens by the spherical aberration correction mechanism and calculates an optimum setting value of the parameter based on plural evaluation values obtained by the plural times of measurement.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: January 26, 2016
    Assignees: Sony Corporation, Sony Computer Entertainment Inc.
    Inventor: Naoyuki Nishigata
  • Patent number: 9196286
    Abstract: An optical disk information device includes a laser light source that emits a luminous flux with a wavelength ?, an objective lens having a numerical aperture NA, a splitting element, a photodetector, a central portion amplifier, at least two end portion amplifiers, an adder, a control signal processing section having a tracking switcher that inverts a polarity of a tracking control signal depending on whether a track scanned by a condensing spot corresponds to a land portion or a groove portion, and a gain controller that, when the polarity of the tracking control signal is inverted, switches gains of the central portion amplifier and the end portion amplifiers and sets the gain of the central portion amplifier substantially lower than the gain of at least one of the end portion amplifiers so as to reduce crosstalk from adjacent tracks in the optical disk.
    Type: Grant
    Filed: May 30, 2013
    Date of Patent: November 24, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kanji Wakabayashi, Kousei Sano, Yoshiaki Komma
  • Patent number: 9177570
    Abstract: Methods and apparatus for coordinating audio data processing and network communication processing in a communication device by using time scaling for either inbound or outbound audio data processing, or both, in an communication device. In particular, time scaling of audio data is used to adapt timing for audio data processing to timing for modem processing, by dynamically adjusting a collection of audio samples to fit the container size required by the modem. Speech quality can be preserved while recovering and/or maintaining correct synchronizing between audio processing and communication processing circuits. In an example method, it is determined that a completion time for processing a first audio data frame falls outside a pre-determined timing window. Responsive to this determination, a subsequent audio data frame is time-scaled to control the completion time for processing the subsequent audio data frame.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: November 3, 2015
    Assignee: ST-Ericsson SA
    Inventors: Jan Fex, Béla Rathonyi, Jonas Lundbäck
  • Patent number: 9153273
    Abstract: A lens driving device includes a lens holder that holds a lens, a driving portion that drives the lens holder through a magnetic force produced using a coil and a magnet, and a guide shaft that supports the lens holder movably. When moving the lens holder to a target position, an AC voltage is applied to the coil over a specific interval from a beginning of movement of the lens holder. Further, an amplitude of the AC voltage is reduced stepwise with the passage of time.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: October 6, 2015
    Assignee: Funai Electric Co., Ltd.
    Inventors: Kazuya Harada, Taishi Morita, Yuji Ishihara
  • Patent number: 9153271
    Abstract: The optical disc device has a circuit which forms a focus error signal for focus servo control based on reflection light from an optical disc exposed to laser light. Also, the device has a data processing unit which can control by feedback a position to which an objective lens is moved by a focusing actuator based on a focus error signal. In label printing, the data processing unit controls, by feedforward, a position to which the objective lens is moved by the focusing actuator based on control data for label printing. The operation resolution of the focusing actuator in feedforward control is made higher than that in feedback control. Thus, an intended position control accuracy is achieved in feedforward control. For instance, in feedforward control, the gain of the driver circuit for the focusing actuator is switched to a smaller one in comparison to that in feedback control.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: October 6, 2015
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Yoshimi Iso, Mitsuo Hagiwara, Mitsuyuki Kimura
  • Patent number: 9142249
    Abstract: A disk drive is disclosed comprising a timing loop configured to generate a clock synchronized to a rotation of a disk and a servo loop configured to control an actuator to actuate a head over the disk. A timing signal generated by the timing loop is filtered with a pre-compensation filter (PCF) comprising an inverse transfer function from a delta in a rotation velocity of the disk (??) due to a vibration affecting the disk drive to the timing signal, and the actuator is controlled to actuate the head over the disk based on an output of the PCF.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: September 22, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Jianguo Zhou, Guoxiao Guo, Donald Brunnett, Min Chen, Wei Guo, Jie Yu
  • Patent number: 9097517
    Abstract: The power input to the light source of a microscope is varied as necessary to maintain a constant degree of detector saturation as the objective is moved toward a best-focus position. Focus is found by tracking the source's intensity necessary to maintain the detector irradiance at a constant level. The in-focus position is reached when the power input (and correspondingly the intensity of the light emitted by the source) reaches a minimum. The concept can be applied in a similar manner to minimize or eliminate tilt in a sample.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: August 4, 2015
    Assignee: BRUKER NANO INC.
    Inventor: Colin Farrell
  • Patent number: 9082429
    Abstract: The optical disc device includes an optical pickup, a focus-error-signal generation section for generating a focus error signal of the differential astigmatic method by using a parameter and an electric signal outputted from a photodetector in the optical pickup, a control section for controlling the optical pickup to make a focus jump operation, and a parameter value changing section for temporarily changing a value of the parameter to be used to generate a focus error signal of the differential astigmatic method by the focus-error-signal generation section when the focus jump operation is performed by using the focus error signal of the differential astigmatic method.
    Type: Grant
    Filed: July 21, 2014
    Date of Patent: July 14, 2015
    Assignee: Funai Electric Co., Ltd.
    Inventor: Kazuki Kajikawa
  • Patent number: 9047886
    Abstract: In an optical disk device, a technique for AC tilt correction with stability and following capability is provided in which, during an operation of a tracking servo mechanism, a lens shift amount obtained from a tracking control signal or a lens position error signal is measured for each of predetermined angles of rotation of an optical disk, and the measured values are averaged in a radial direction of the optical disk, and a tilt controller corrects an AC tilt based on the resulting average value.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: June 2, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Tomonori Kishimoto
  • Patent number: 8995242
    Abstract: A system and method for adjusting the radial tilt, tangential tilt, or a combination of radial and tangential tilt of an optical detection unit in an optical disc reading system can include applying different weighting factors to different signal components depending on which detection area detects the component, measuring a value of a signal characteristic, such as signal-to-noise ratio, of two signals with different sets of weighting factors, and determining an adjustment factor to the radial tilt as a function of the of the measured signal characteristic values.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: March 31, 2015
    Assignee: Marvell International Ltd.
    Inventors: Mats Oberg, Zachary Keirn, Christopher Painter
  • Publication number: 20150055443
    Abstract: Provided is an optical disc device including: an optical pickup which includes an objective lens and a receiver unit which receives light reflected off an optical disc; a signal processing unit which generates a main push-pull signal and sub push-pull signals from signals from the receiver unit, and obtains a signal obtained by subtracting the main push-pull signal from the sub push-pull signal multiplied K times, to generate a tracking-error signal; and a control unit which performs a midpoint servo process, an offset process of adding an offset value to a lens-error signal indicating displacement of the objective lens, a stabilization awaiting process of waiting for oscillation of the optical disc to stabilize, a measurement process of measuring the tracking-error signal, and a K value adjusting process of adjusting a value of K in response to a result of the measurement process.
    Type: Application
    Filed: August 18, 2014
    Publication date: February 26, 2015
    Inventor: Mamoru KUWAJIMA
  • Patent number: 8958273
    Abstract: Devices and methods capable of controlling disc read operations are disclosed. For example, an electronic circuit can include an error-severity determining circuit configured to determine a severity of read error that occurs for a block of data read from a disc, and a re-read decision-making circuit that determines whether to re-read the block of data based on the severity of read error.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: February 17, 2015
    Assignee: Marvell International Ltd.
    Inventors: Estuardo Licona, Mats Oberg, Wim Schonkeren
  • Patent number: 8929189
    Abstract: An objective lens capable of converging light of a used wavelength with a satisfactory aberration on a recording medium is provided. An objective lens for converging light of a predetermined wavelength ? on a recording medium satisfies the following condition: |CML|+|CMF|<0.03?, where CML is an amount of a generated third-order coma aberration per 1 degree of tilt of the objective lens, and CMF is an amount of a generated third-order coma aberration per 1 degree of tilt of off-axis light.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 6, 2015
    Assignee: Panasonic Corporation
    Inventors: Kazuhiro Minami, Yasuhiro Tanaka
  • Patent number: 8923105
    Abstract: A ratio Xm of an information item recorded on an adjacent track relative to an information item recorded on a main track included in a first signal obtained from a first light flux having passed through a center region (6c) is different from ratios Xs1 and Xs2 of the information items recorded on the adjacent track relative to the information items recorded on the main track included in second and third signals obtained from second and third light fluxes having passed through first and second end regions (6r, 6l), and a ratio of respective gains of a first waveform equalizer (80c), a second waveform equalizer (80r), and a third waveform equalizer (80l) is determined so as to cancel the information item recorded on the adjacent track in each of frequency components of the first signal, the second signal, and the third signal.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: December 30, 2014
    Assignee: Panasonic Corporation
    Inventors: Kousei Sano, Yoshiaki Komma, Kanji Wakabayashi
  • Patent number: 8873358
    Abstract: There is provided a skew detection method including supplying reproduction signals, which are respectively reproduced approximately simultaneously from at least two tracks including a first adjacent track and a second adjacent track located on both sides of a main track, to first and second filters, causing a combining unit to combine output signals of the first and second filters with a reproduction signal which is reproduced from the main track approximately simultaneously with the first adjacent track and the second adjacent track so as to cancel crosstalk, causing a coefficient control unit to obtain an error with a target value of the output signal of the combining unit and control coefficients of the first and second filters so as to reduce the error, and detecting a skew of an optical disc from values of coefficients of predetermined taps of the first and second filters.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: October 28, 2014
    Assignee: Sony Corporation
    Inventors: Kimihiro Saito, Junya Shiraishi
  • Patent number: 8842508
    Abstract: A data phase locked loop circuit includes a phase locked loop circuit, a judging circuit, a detecting circuit and a control circuit. The phase locked loop circuit outputs a reference signal according to a data signal, which is generated by an optical drive reading an optical disk. When the judging circuit judges that a jitter signal is smaller than a threshold value, the control circuit stores a frequency of the reference signal. When the detecting circuit detects a defect zone of the optical disk read by the optical drive, the phase locked loop circuit fixes the frequency of the reference signal to a latest stored one.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: September 23, 2014
    Assignee: VIA Technologies, Inc.
    Inventors: Luke Wen, Pei-Chieh Hu
  • Patent number: 8830803
    Abstract: An optical drive apparatus that reproduces an optical disk having a land and a groove, the optical drive apparatus including a first tracking-error-signal generating unit that generates a first tracking error signal by using a DPD method, a second tracking-error-signal generating unit that generates a second tracking error signal by using a DPP method, a tracking servo unit that controls the optical system, and a determining unit that determines that an irradiation point of an optical beam is in a non-recorded area. The tracking servo unit switches over to a control based on the second tracking error signal in response to a result of determination by the determining unit during performing a control based on the first tracking error signal.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: September 9, 2014
    Assignee: TDK Corporation
    Inventors: Tetsuya Nishiyama, Takashi Kikukawa
  • Patent number: 8804472
    Abstract: A method comprising recording data related to a start-up procedure on at least one of a plurality of recording layers disposed on an optical record carrier for reading back the recorded data during subsequent start-ups, the selection of the at least one recording layer based on properties of the at least one recording layer is disclosed. The technique reduces the optical record carrier start-up time and is useful for DVD, HD-DVD and BD recorders and/or players.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: August 12, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Ronald A. J. van den Oetelaar, Donato Pasquariello
  • Patent number: 8760981
    Abstract: There are provided an optical disc device and its recording/reproducing method for managing the management information about plural optical discs efficiently. In the present invention, the management information about the plural optical discs is stored in a memory. Moreover, the management information about part or all of the optical discs stored in the memory is recorded in the optical disc.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: June 24, 2014
    Assignees: Hitachi-LG Data Storage, Inc., Hitachi Consumer Electronics Co., Ltd.
    Inventors: Yasuo Mutsuro, Yutaka Nagai, Koichiro Nishimura, Masakazu Ikeda, Osamu Kawamae
  • Patent number: 8737182
    Abstract: Some of the embodiments of the present disclosure provide a method for operating a disc drive system, the method comprising based at least in part on a first injector signal, oscillating a focusing apparatus of the disc drive system; while oscillating the focusing apparatus of the disc drive system and rotating a disc placed within the disc drive system, estimating an amplitude of a track crossing speed signal; generating a second injector signal having a frequency that is substantially the same as a frequency of the first injector signal; and based at least in part on the estimated amplitude of the track crossing speed signal and the second injector signal, estimating a sign of the track crossing speed signal.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: May 27, 2014
    Assignee: Marvell International Ltd.
    Inventor: Antonius Leonardus Dekker
  • Patent number: 8737179
    Abstract: An optical disc device includes an optical pickup and a controller. The optical pickup is configured to emit light to an optical disc and detect the light reflected on the optical disc. The controller is configured to perform adjustment of at least one of spherical aberration, focus balance and lens tilt of the optical pickup based on a reproduction signal corresponding to the light detected by the optical pickup. The controller is further configured to perform the adjustment based on a level of the reproduction signal of adjustment-use recording. The controller is further configured to perform re-adjustment after performing subsequent adjustment-use recording in response to the level of the reproduction signal of the adjustment-use recording being at or below a specific threshold after the adjustment.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: May 27, 2014
    Assignee: Funai Electric Co., Ltd.
    Inventors: Takayuki Ono, Masaki Mataga
  • Patent number: 8737178
    Abstract: An apparatus comprises a lens, an alignment feature positioned adjacent to a surface of the lens, a detector for producing an alignment signal in response to a portion of incident light reflected by the alignment feature and a portion of the incident light reflected by the surface adjacent to the alignment feature, and an actuator for controlling alignment of the incident light in response to the alignment signal. A method of controlling alignment of the beam of incident light is also provided.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: May 27, 2014
    Assignee: Seagate Technology LLC
    Inventors: Thomas Dean Milster, Jaisoon Kim
  • Patent number: 8730774
    Abstract: An optical disk device includes an optical pickup, and a controller. The optical pickup emits light on an optical disk, and detects return light from the optical disk. The controller performs a focus control based on a focus error signal corresponding to the return light detected by the optical pickup, and performs a tracking control based on a tracking error signal corresponding to the return light detected by the optical pickup. The controller finds a relation of an amount of deviation in a tracking balance of the tracking error signal relative to a change in a focus balance of the focus error signal while the tracking control is stopped prior to reproduction of the optical disk. The controller corrects the deviation in the tracking balance attributable to the change in the focus balance based on the relation while the focus balance is adjusted.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: May 20, 2014
    Assignee: Funai Electric Co., Ltd.
    Inventor: Mamoru Kuwajima
  • Patent number: 8711665
    Abstract: A data storage device comprising a non-volatile media including a plurality of segments, and configured to store a defect list, and a controller configured to perform a defect management process. The defect management process can include testing the plurality of segments for defects, detecting a defect in a first segment of the plurality of segments, updating the defect list to include the first segment, determining a defective space amount based on the segments in the updated defect list, determining whether the defective space amount indicates a storage capacity error, transmitting a storage capacity error signal to the test system when the defective space amount indicates the storage capacity error, and when the defective space amount does not indicate the storage capacity error, continuing to test the plurality of segments for defects until the defective space amount indicates the storage capacity error or all the segments have been tested.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: April 29, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventor: Hasni Zaidy Abdul Hamid
  • Patent number: 8675461
    Abstract: Devices, methods, and other embodiments associated with adjusting a defect threshold are described. In one embodiment, an apparatus includes defect detection logic and threshold adjustment logic. The defect detection logic determines, by using a defect threshold, if a read channel has read data from a defective portion of an optical disc. The threshold adjustment logic adjusts the defect threshold based, at least in part, on a gain value of a gain loop associated with the read channel.
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: March 18, 2014
    Assignee: Marvell International Ltd.
    Inventors: Jin Xie, Mats Oberg
  • Patent number: 8675459
    Abstract: The amplitude deviation of a tracking error signal in an optical disk apparatus is reliably corrected by processing signals at low costs. A servo signal generator generates a tracking error signal and a lens error signal from a photodetected signal. A lens error deviation signal memory circuit stores the lens error signal generated at the servo signal generator, and reproduces the one-turn deviation of the lens error signal. A tracking error signal corrector learns an amplitude correcting value for the tracking error signal from the tracking error signal detected in reproducing the one-turn deviation of the lens error signal, and stores the amplitude correcting value in a correcting signal generator.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: March 18, 2014
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventor: Fumio Isshiki
  • Patent number: 8659983
    Abstract: New and useful methods and systems for reading optical discs, such as multi-layer Blu-ray discs are disclosed. For example, in an embodiment a device for reading two-layered optical discs includes a laser diode capable of emitting light, a set of optics including a fixed collimator, the set of optics providing a numerical aperture (NA) of substantially less than 0.85, and a detector for detecting laser light focused on a two-layer optical disc to produce a stream of detected bits.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: February 25, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Jeroen Dorgelo, Mats Oberg, Antonius Leonardus Johannes Dekker
  • Patent number: 8654619
    Abstract: A disk drive is disclosed including a rotatable disk having a user area including a first sector, and a spare area including a second sector, and configured to store a relocation list. The disk drive also includes a controller configured to receive a write command to write first data to the first sector, determine that the first data includes an amount of data less than a storage capacity of the first sector, read second data in the first sector, determine that there is a read error when reading the second data in the first sector, temporarily relocate the first sector to the second sector, maintain the second data in the first sector, and perform a test on the first sector to determine whether to copy the first data to the first sector, or permanently relocate the first sector to the second sector.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: February 18, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventor: Glenn Chek Heong Cheng
  • Patent number: 8638646
    Abstract: An optical information processing method and apparatus performs a light irradiating and receiving step, a signal processing step, and an adjusting step of a spherical aberration and a focus offset on the basis of shift amount of first and second control devices and a performance evaluation value. The performance evaluation values for first, second, third and fourth points in an x and y coordinate system are detected, in which an x-coordinate is one of the shift amount of the first control device and the shift amount of the second control device and a y-coordinate is the other, the first point, second and third points having the same y-coordinate and different x-coordinates with each other, the fourth point being provided on a first straight line passing through the first point and being different from the first point.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: January 28, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yusuke Kanatake, Tomo Kishigami, Yoshihiro Kiyose, Nobuo Takeshita
  • Patent number: 8634285
    Abstract: Aspects of the disclosure provide a sync mark detector. The sync mark detector includes a first unit configured to decay over time a value indicating a length of a bit format, a second unit configured to compare the decayed value with a detected length of the bit format to determine a new length, and a third unit configured to detect a sync mark based on the detected length and the new length.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: January 21, 2014
    Assignee: Marvell International Ltd.
    Inventors: Mats Oberg, Jin Xie
  • Patent number: 8619520
    Abstract: Provided is a lens driving unit for an optical pickup and an optical disc drive employing the lens driving unit. First and second driving coils are directly wound around a coil winding unit included in the lens frame, which is different from a conventional lens frame in which a driving coil is manufactured as a separate element and is separately attached to a lens frame.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: December 31, 2013
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Young-bin Lee, Soo-hyun Baek
  • Patent number: 8611194
    Abstract: The invention solves the problem that data cannot be recorded on a disc because the number of registered Defect Lists (DFLs) has reached a limit and the problem that the access performance is reduced at recording data reproduction time. A cluster, which is normally reproduced during verification processing and is preceded and followed by one or more defective blocks, is also treated as a defective block and, together with the preceding and following defective clusters, recorded in an spare area for extending the range in which clusters are registered as Contiguous Re-allocated Defect (CRD) entries. This reduces the number of DFLs to solve the problem that data cannot be recorded on the disc and, in addition, reduces the number of seek operations to prevent the access performance from being reduced at reproduction time.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: December 17, 2013
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventor: Kenji Akahoshi
  • Patent number: 8599664
    Abstract: An unbalanced disc determining apparatus is provided. The unbalanced disc determining apparatus includes a noise reduction unit configured to reduce noise components of a center error signal obtained from a signal configured to detect light reflected by a disc revolved by a spindle motor, and a determination unit configured to determine whether the revolving disc is unbalanced by determining whether the center error signal of which noise is reduced exceeds a reference value.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: December 3, 2013
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventor: Jong-jin Lee
  • Patent number: 8565052
    Abstract: Methods and systems are described for correcting repeatable runout. In one aspect, an open loop tracking signal is received and squared. A discrete Fourier transform (DFT) of the squared open loop tracking signal is obtained. A velocity magnitude and an absolute value of the phase of the open loop tracking signal is determined. A RRO correction signal is iteratively constructed by performing a partial correction based on an initial phase selected and an initial velocity amplitude, measuring a relative velocity amplitude, performing a partial control correction using the initial phase and relative velocity amplitude if the amplitude is smaller than an initial amplitude or using the initial phase rotated by one hundred eighty degrees and the relative velocity amplitude if the amplitude is larger than an initial amplitude, and repeating the above steps until a tracking controller can perform closed loop control of the track to optical pickup unit velocity.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: October 22, 2013
    Assignee: Optical Devices, LLC
    Inventors: Fred R. Hansen, Charles R. Watt
  • Patent number: 8565060
    Abstract: The invention provides an optical pickup device that ensures complete curing of adhesive when a tilt adjusting holder is glued to an objective lens holder. The optical pickup device comprises: a light source; an objective lens for focusing light emitted from the light source onto an optical storage medium; a tilt adjusting holder to which to secure the objective lens; and an objective lens holder to which to glue the tilt adjusting holder. The objective lens holder includes: adhesive joint sections for securing the tilt adjusting holder to the objective lens holder using an adhesive; a seat section on which the tilt adjusting holder abuts; and adhesive anti-overflow pockets, located between the adhesive joint sections and the seat section, for receiving the adhesive when the adhesive flows from the adhesive joint sections.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: October 22, 2013
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Rika Nomura, Hidenao Saito, Yoshiro Konishi
  • Patent number: 8553510
    Abstract: A system and method for adjusting the radial tilt, tangential tilt, or a combination of radial and tangential tilt of an optical detection unit in an optical disc reading system can include applying different weighting factors to different signal components depending on which detection area detects the component, measuring a value of a signal characteristic, such as signal-to-noise ratio, of two signals with different sets of weighting factors, and determining an adjustment factor to the radial tilt as a function of the of the measured signal characteristic values.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: October 8, 2013
    Assignee: Marvell International Ltd.
    Inventors: Mats Oberg, Zachary Keirn, Christopher Painter
  • Patent number: 8537648
    Abstract: A position control method of an optical pickup head of an optical disc drive is provided. The optical disc drive has an optical pickup head for reading data from an optical disc and a step index for controlling the movement of the optical pickup head. The position control method includes: calculating a first position information of the optical pickup head according to the step index; reading an address information from the optical disc, calculating a second position information of the optical pickup head according to the address information; determining whether a difference between the first position information and the second position information is greater than a predetermined value; updating the step index when the difference is not greater than the predetermined value; moving the optical pickup head to an initial position when the difference is greater than the predetermined value, and setting the step index as zero.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: September 17, 2013
    Assignee: Philips & Lite-On Digital Solutions Corporation
    Inventors: Tsung-Yu Lu, Yen-Chun Lin, Hung-Lung Tseng, Tun-Chieh Lee