Light Intensity Adjustment Or Maintenance Patents (Class 369/116)
  • Patent number: 10333625
    Abstract: A system for controlling an optical data transmitter includes control circuitry comprising a voltage controlled current source configured to generate a reference current configured to generate at least two output currents whose magnitudes are in a fixed ratio wherein at least one of said output currents is used by said control circuitry to control current driver circuitry, a first plurality of serially coupled resistors, a first plurality of switches, a second plurality of serially coupled resistors, a second plurality of switches, and a look-up-table configured to control the first plurality of switches and the second plurality of switches based on an input to control a ratio.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: June 25, 2019
    Assignee: HILIGHT SEMICONDUCTOR LIMITED
    Inventors: Dominique Coue, William Redman-White
  • Patent number: 10319155
    Abstract: A tracking system having a website connected to a electronic device over an electronic network. Identification information associated with participant information related to an identification chip worn by a participant and stored in the electronic device. The website displays the present position of a selected participant, a live continuous video feed from selected check points, the pace of the selected participant and the estimated time of arrival for the participant at a selected check point.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: June 11, 2019
    Inventor: Ravi Vemulapalli
  • Patent number: 10238297
    Abstract: The present invention uses an object information acquiring apparatus having: an optical transmitter that transmits light and emits the light to an object; a first optical meter disposed at the incidence side of the optical transmitter; a second optical meter disposed at the emission side of the optical transmitter; a calculator that calculates an equation that indicates the relationship between the fluence of light measured by the first optical meter and the fluence of light measured by the second optical meter; a probe that receives an acoustic wave that is generated from the object due to the light emitted by the optical transmitter and converts the acoustic wave; and a processor that acquires specific information about the inside of the object.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: March 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hiroshi Yamamoto, Yukio Furukawa
  • Patent number: 10121581
    Abstract: An article having a multiple magnetic polarities and a method for making the article are disclosed. The article can be a monolithic substrate form from a metallic material or materials. The article may include a first magnetic polarity and a second magnetic polarity opposite the first magnetic polarity. Methods for making the article include provide either providing a monolithic substrate having a first magnetic polarity, or applying a first magnetic field to the monolithic substrate to impart a first magnetic polarity. The method may also include raising the temperature of the monolithic substrate in order to reduce the coercivity of the monolithic substrate. The temperature of the monolithic substrate may also be selectively raised to lower the coercivity of the monolithic substrate in associated areas. By lowering the coercivity, the second magnetic polarity may be imparted on the monolithic substrate.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: November 6, 2018
    Assignee: Apple Inc.
    Inventors: Hao Zhu, John C. DiFonzo, Sean S. Corbin
  • Patent number: 10122248
    Abstract: Electric drive device for an electric power steering system that includes an electric motor with a motor case, and a motor shaft with a drive end, an electronic control unit that controls the drive of the motor, According to one embodiment the electronic control unit includes a power board and a heat sink. A connector coupled to a side of the electric drive device is at least partially maintained in its position with the use of one or more projections projecting from a first area of the connector that reside within one or more corresponding housings located in a peripheral region of the heatsink.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: November 6, 2018
    Assignee: FAGOR, S. COOP
    Inventors: Francisco Javier Acinas Lope, Fernando Martinez Areal, Javier Gomez De Segura Ipacua, Jose Sanchez Luaces
  • Patent number: 10056106
    Abstract: A circuit includes a light source, a sensor, and a switch. The sensor measures output of the light source and provides an electrical signal to a feedback loop that is indicative of the measured output of the light source. The switch is positioned in the feedback loop and is movable between a first position and a second position depending upon whether the feedback loop is operating in a first mode of operation or a second mode of operation. During the first mode of operation the output of the feedback loop adjusts at least one operating parameter of the light source responsive to the electrical signal. During the second mode of operation the output of the feedback loop does not adjust the at least one operating parameter of the light source responsive to the electrical signal.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: August 21, 2018
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventor: Scott O'Brien
  • Patent number: 10026443
    Abstract: An error is determined in a target track of a heat-assisted recording medium. The error triggers an error recovery procedure. The error recovery procedure involves storing data from at least part of an adjacent track that is immediately proximate the target track to another data storage location. The error recovery procedure also involves, for two or more iterations in which a laser power is incrementally changed from a lower power to a higher power, erasing at least part of the adjacent track at the laser power and attempting to recover the target track.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: July 17, 2018
    Assignee: Seagate Technology LLC
    Inventors: Wenzhong Zhu, Jason Charles Jury, Pu-Ling Lu, Edward Charles Gage
  • Patent number: 9993658
    Abstract: The present invention relates to light applicators, systems comprising light applicators, and methods for their use. One aspect of the invention provides a light applicator configured for contacting a portion of a subject's body surface and controllably applying light irradiation thereto. The light applicator comprises a housing, the housing comprising a treatment plate for contacting the portion of the subject's body surface and having one or more windows. One or more light emitters are disposed inside the light applicator and projecting toward the corresponding one or more windows of the treatment plate. A heat spreader plate is disposed inside the light applicator. One or more heat conducting members thermally connect the treatment plate to the heat spreader plate.
    Type: Grant
    Filed: August 15, 2013
    Date of Patent: June 12, 2018
    Assignee: YOLO Medical Inc.
    Inventors: Gregory Vincent Browne, James Elliott Cameron, Trevor Pleydell-Bouverie Malcolm Moat, Christian Terry Proch McMechan
  • Patent number: 9972344
    Abstract: A data storage device is disclosed comprising a first head actuated over a first disk surface, wherein the first head comprises a laser configured to heat the first disk surface while writing data to the first disk surface. A write power is applied to the laser and a first write operation is executed to write first data to the first disk surface during a first revolution of the first disk surface. A first transient decrease in an output power of the laser is detected during the first write operation, and when the first transient decrease in the output power of the laser is detected during the first write operation, a write-verify of the first data is executed during a second revolution of the first disk surface.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: May 15, 2018
    Assignee: Western Digital Technologies, Inc.
    Inventors: Huanxiang Ruan, Galvin Chia, Prakash Balasubramaniam, Phillip S. Haralson, Dennis W. Hogg
  • Patent number: 9842619
    Abstract: A set of consecutive user data wedges are each located between consecutive servo wedges of a heat-assisted recording medium. Test data is written at least every other one of the consecutive data wedges using different laser power values. Based on reading the test data, a nominal laser power is selected for use by the read/write head.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: December 12, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Alfredo Sam Chu, Wenzhong Zhu, Tim Rausch
  • Patent number: 9646420
    Abstract: An information processing apparatus includes circuitry configured to: control an imaging device to stop a first focus adjustment when a specific object is detected from a first image captured by the imaging device while the first focus adjustment is in execution, the first focus adjustment being performed at each first time interval by the imaging device, and control the imaging device to start a second focus adjustment when the specific object is not detected from a second image captured by the imaging device after the imaging device is controlled to stop the first focus adjustment.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: May 9, 2017
    Assignee: FUJITSU LIMITED
    Inventor: Kyosuke Imamura
  • Patent number: 9581685
    Abstract: There are provided a transducer that irradiates an ultrasonic wave, a transmitter that drives the transducer, and a plurality of power sources that supply a plurality of positive voltages and negative voltages to the transmitter. The transmitter includes a plurality of switches (SW1 to SW4) that connect the power sources selectively, and a timing controller that controls a plurality of the switches. A driving pulse is generated through a selection of the switches. A plurality of the positive voltages and a plurality of the negative voltages have absolute values different from each other. With this configuration, it is possible to provide an ultrasonic diagnostic apparatus that allows the amplitude of the driving pulse to be varied in multiple stages, is low in cost, and requires small amounts of both material and control.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: February 28, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventor: Morio Nishigaki
  • Patent number: 9553537
    Abstract: A de-glitch circuit, a de-glitch method and a short circuit protection device are provided. In a period during which a first flag signal is in a first logic state, the de-glitch circuit increases a counting result with a rising rate. In a period during which the first flag signal is in a second logic state, the de-glitch circuit decreases the counting result with a falling rate, wherein the rising rate is greater than the falling rate. The de-glitch circuit sets a logic state of a second flag signal according to a relationship between the counting result and a threshold.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: January 24, 2017
    Assignee: ACTRON TECHNOLOGY CORPORATION
    Inventor: Chih-Chun Lu
  • Patent number: 9520943
    Abstract: An example embodiment includes a system for communicating an optical signal. The system includes an optical transmitter and an optical receiver. The optical transmitter includes one or more lasers configured to produce a light signal and a transmitter optical sub assembly (TOSA) receptacle. The TOSA receptacle optically couples the lasers to an optical fiber and launches a quasi-multimode optical signal (quasi-MM signal) that includes at least one lower order mode optical signal and at least one higher order mode optical signal onto the optical fiber. The optical receiver is connected to the optical fiber via a receiver optical sub assembly (ROSA) receptacle. The optical receiver is configured to receive the quasi-MM signal and to substantially block the at least one higher order mode optical signal.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: December 13, 2016
    Assignee: FINISAR CORPORATION
    Inventors: Samir Sheth, Jonathan P. King, T.H. Ola Sjolund, Xiaojie Xu, Tengda Du, Steffen Koehler
  • Patent number: 9502068
    Abstract: A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk. While writing data to the disk, an updated power setting for the laser is stored in a staging register, and during a non-write mode, the updated power setting is transferred from the staging register to an operating register in order to update an operating power for the laser.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: November 22, 2016
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventor: Phillip S. Haralson
  • Patent number: 9494626
    Abstract: A constant period signal monitoring circuit for monitoring a constant period signal that is output periodically when a control processor operating according to a program is normal, includes a signal input terminal that receives the constant period signal, an edge detection section that detects a change of the constant period signal appearing at the signal input terminal from a low level to a high level or from a high level to a low level as an edge of the constant period signal, and a time measuring section that measures a length of the time during which a state of not detecting the edge continues on the basis of an output of the edge detection section and outputs an abnormality detection signal in a case that the measured time exceeds a threshold value.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: November 15, 2016
    Assignee: YAZAKI CORPORATION
    Inventor: Kazuhisa Wataru
  • Patent number: 9432058
    Abstract: An error correction apparatus for a digital signal received by a signal reception terminal includes two error correction modules. The first error correction module performs first error correction on an input signal to generate an intermediate signal satisfying a termination condition. The second error correction module receives and selectively performs second error correction on the intermediate signal to generate a corrected signal. The termination condition is associated with a maximum error correction capability of the second error correction.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: August 30, 2016
    Assignee: MStar Semiconductor, Inc.
    Inventors: Yu-Hsien Ku, Tung-Sheng Lin, Yi-Ying Liao
  • Patent number: 9336813
    Abstract: According to one embodiment, there is provided a magnetic disk device including a light irradiation element and a control unit. The light irradiation element is configured to irradiate a magnetic disk with light according to a driving signal. The control unit is configured to lower, in multistep manner, active level of the driving signal contributing intensity of the light when a low frequency pattern of write data is recorded into the magnetic disk.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: May 10, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Naoki Tagami
  • Patent number: 9333787
    Abstract: An optical device projecting one or more synthetically magnified images that has been laser marked with one or more static two dimensional (2D) images is provided. The static 2D image(s) laser marked on or within this device and the synthetically magnified image(s) projected by this device help determine the authenticity of a document (e.g., passport data page) or product that employs it. Several embodiments of the inventive device also offer increased resistance to tampering or alteration and wear.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: May 10, 2016
    Assignees: Visual Physics, LLC, Crane & Co., Inc., Crane AB
    Inventors: Samuel M. Cape, Jonathan D. Gosnell, Kaj Markkus Helminen, Gregory R. Jordan, Scott K. Palm, Giles D. Prett, Timothy W. Schneider, Anthony J. Zucchero
  • Patent number: 9307602
    Abstract: An illumination system for a projection apparatus includes a light source module, an integrating rod and an optical detecting module. The light source module is capable of emitting an illuminating light beam. The integrating rod has a light entrance surface facing toward the light source module. The optical detecting module includes a light guiding device and an optical detecting device. The light guiding device has a first end surface and a second end surface. The first end surface is farther away from the light entrance surface of the integrating rod than the second end surface. The optical detecting device is disposed adjacent to the first end surface of the light guiding device and electrically connected to the light source module. The light source module is capable of adjusting intensity of the illuminating light beam according to randomly emitted light detected by the optical detecting device.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: April 5, 2016
    Assignee: CORETRONIC CORPORATION
    Inventors: Wen-Chih Yang, Yung-Ta Chen, Sheng-Yu Chiu, Fan-Chieh Chang
  • Patent number: 9123370
    Abstract: A data storage device is disclosed comprising a disk, a head comprising a laser, and a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting. A first fly height of the head is measured at a first laser power setting, and a second fly height of the head is measured at a second laser power. A FHA write setting is generated based on a calibrated write laser power, the first and second fly height measurements, and a first function representing a nominal FHA delta setting between a read touchdown FHA setting and a write touchdown FHA setting relative to a delta in a fly height of the head due to a corresponding change in laser power applied to the laser, where the FHA write setting is applied to the FHA during the write operation.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: September 1, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Huanxiang Ruan, Galvin T. Chia
  • Patent number: 9099144
    Abstract: A disk drive is disclosed comprising a disk and a head comprising a laser configured to heat the disk while writing to the disk. Data is written to the disk using an operating laser power applied to the laser, and then the data is read from the disk to generate a read signal. A ramp interval is measured for an amplitude of the first read signal to ramp up to a first threshold.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: August 4, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Galvin T. Chia, Prakash Balasubramaniam
  • Patent number: 9081364
    Abstract: In an optical information recording/reproducing apparatus using holography, there are provided the optical information recording/reproducing apparatus, method thereof, and optical information recording medium which correct a zero point and variation of unit quantity of a reference beam angle between apparatus and perform recording or reproducing operation with high compatibility between apparatus. The optical information recording/reproducing apparatus detects a reference beam angle suitable to reproduce angle correction data recorded on the optical information recording medium and corrects a zero point and unit quantity of the reference beam angle at the time of recording or reproducing operation based on the detection angle information.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: July 14, 2015
    Assignee: HITACHI CONSUMER ELECTRONICS CO., LTD.
    Inventor: Makoto Hosaka
  • Patent number: 9030922
    Abstract: The invention relates to recording on a medium, and in particular, to laser control during recording data on an optical medium. A laser control method for dynamically adjusting laser power during recording data onto an optical disc comprises: recording normal data onto the optical disc according to an initial laser power; stopping recording when a trigger is generated; reading back the recorded normal data and generating a first recording quality index; recording a test pattern at a test pattern starting point according to a selected laser power; reading back the test pattern and generating a second recording quality index; and determining an adaptive laser power to continually record the normal data according to the first recording quality index and the second recording quality index.
    Type: Grant
    Filed: June 9, 2009
    Date of Patent: May 12, 2015
    Assignee: Mediatek Inc.
    Inventors: Chih-Ching Yu, Hung-Hsiang Chang, Ping-Tsai Tsai
  • Patent number: 9001632
    Abstract: The present application discloses an information device for performing optical information processes for a recording medium including a phase-change recording layer which becomes amorphous under irradiation with pulsed amorphization light that has prescribed amorphization energy Ew. The information device includes an irradiator configured to irradiate a prescribed region of the phase-change recording layer with pulsed light and an energy setting portion which sets crystallization energy Ee for the pulsed light to crystallize the prescribed region. The crystallization energy Ee per the pulsed light, which is set by the energy setting portion, is greater than the amorphization energy Ew per the pulsed amorphization light.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: April 7, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takashi Mihara, Shigeru Furumiya
  • Patent number: 8986123
    Abstract: An information provision apparatus includes a storage section that stores item data, an update section that updates the item data when an item quantity change event has occurred during a first game that is executed by a first terminal, and a control section that causes a communication section to transmit item information to a second terminal when a purchase request operation has been performed by using a second terminal.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: March 24, 2015
    Assignee: BANDAI NAMCO Games Inc.
    Inventors: Shinya Satake, Masahiro Akatsuka
  • Patent number: 8953429
    Abstract: An optical disc device includes an optical pickup unit including a semiconductor laser that shines a laser light, a light-receiving unit that receives the return light of the laser light, a high-frequency generating circuit that generates high-frequency signals, a pickup driver that generates a drive signal that drives the semiconductor laser based on the high-frequency signal, a control unit that controls the high-frequency generating circuit such that, in states in which playback of the optical disc is halted while irradiation with the laser light is being performed, the signal level of the high-frequency signal to be superimposed is set at a first signal level other than zero so as to be smaller than in states in which the playback is performed.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: February 10, 2015
    Assignee: Funai Electric Co., Ltd.
    Inventor: Shinji Fujita
  • Patent number: 8934324
    Abstract: There is provided a light source including a mode-lock laser unit that includes a semiconductor laser and an external resonator unit and emits a laser beam having a predetermined frequency, the semiconductor laser including a saturable absorber unit that applies a reverse bias voltage and a gain unit that applies a gain current, a semiconductor optical amplifier that performs amplification modulation on the laser beam emitted from the mode-lock laser unit, a laser clock generating unit that generates a laser clock synchronized with the laser beam based on a signal detected from the saturable absorber unit when the laser beam oscillates in the mode-lock laser unit, and a modulating unit that generates a driving current synchronized with the laser clock and applies the driving current to the semiconductor optical amplifier.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: January 13, 2015
    Assignee: Sony Corporation
    Inventors: Tsutomu Maruyama, Goro Fujita
  • Patent number: 8929185
    Abstract: Provided is an optical disc apparatus and an optical disc recording method, in which it is decided whether or not an optical disc recording medium is one of DVD-RW and DVD+RW when data is recorded in the medium. If it is decided that the medium is one of DVD-RW and DVD+RW, maximum length information is read out from a storage portion. The maximum length information contains a previously set maximum data length of data recorded to the medium by an optical pick-up portion in one recording operation. Data to be recorded is split into split data having a data length of the maximum data length or smaller. Further, an electric power value of a base electric power for controlling the semiconductor laser element to emit a laser beam with a bottom power is reset every recording operation of the split data.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: January 6, 2015
    Assignee: Funai Electric Co., Ltd.
    Inventor: Kazuhiro Ichikawa
  • Patent number: 8913469
    Abstract: An optical information storage medium system is provided. The optical information storage medium system includes an optical pickup, which comprises a photo-detector configured to control light power detected by receiving a portion of light emitted from a light source and obtains an output signal proportional to output light power of the light source from a signal detected by the photo-detector, and a signal processor configured to signal-process the output signal input from the optical pickup. The signal processor includes a sensitivity acquisition unit configured to acquire a sensitivity value of the photo-detector, a gain calculator configured to calculate a target gain value to be used in comparing the sensitivity value of the photo-detector, which is acquired by the sensitivity acquisition unit, with a target sensitivity value to be used by the optical information storage medium system, and a gain adjustment unit.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: December 16, 2014
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Hong-kuk Kim, Jong-hwa Yu
  • Patent number: 8861323
    Abstract: The present invention optimizes recording power based on correct ? value. Whether an average of modulation values between the 2-4th AUNs is equal to or less than 65% of an average of modulation values between the 5-7th AUNs or not is judged. Otherwise, the gradual emission is performed, the ? value is measured, and then the following requirement is judged: (average of ? values between 5-7th AUNs)?(average of ? values between 2-4th AUNs)?0.18 If each requirement is satisfied, track shift is judged to occur. The recording area of high output is compared with the recording area of lower output to judge whether or not magnitude relation matches the correct magnitude relation. Also, whether the difference between the ? value of high output and the ? value of lower output is equal to or more than the predetermined value (0.18) or not is judged.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: October 14, 2014
    Assignee: Funai Electric Co., Ltd.
    Inventors: Shinya Shimizu, Hiroshi Mitsuda
  • Patent number: 8861124
    Abstract: A heat-assisted magnetic recording (HAMR) transducer is coupled with a laser for providing energy and has an air-bearing surface (ABS) configured to reside in proximity to a media during use. The HAMR transducer includes a waveguide optically coupled with the laser and an optical power monitor optically coupled with the waveguide. The waveguide directs energy from the laser toward the media. The optical power monitor is optically coupled with the waveguide. The optical power monitor for captures a portion of the energy, converts the portion of the energy to heat and measures a local temperature proximate to the optical power monitor.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: October 14, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Marc A. Finot, Matthew R. Gibbons, William J. Kozlovsky, Hongxing Yuan
  • Patent number: 8854936
    Abstract: Embodiments of optical disc drives are described that perform automatic forward sense calibration of write laser power using a sample and hold sampling strategy that is automatically determined based on an automatically selected write strategy. Embodiments of the described optical disc drive may be dynamically configured to support any optical disc media, any write mode, and any write strategy. The write strategies supported may include dynamically changing write speeds and/or write power levels across the respective optical media tracks. As the optical drive is automatically configured for a selected write media/write mode/write strategy, the sample and hold sampling delays used to control the sampling of a forward sense feedback signal are also automatically configured, thereby allowing each forward sense sampling point to be aligned with an area of the forward sense feedback signal that corresponds to a power level of interest and that avoids distortion in the feedback signal.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: October 7, 2014
    Assignee: Marvell International Ltd.
    Inventors: Gary Christopher Maul, Tom Geukens
  • Patent number: 8854939
    Abstract: An optical disk apparatus has: a laser (14) that outputs light; an optical system that includes an SIL (2) for forming a predetermined sized beam spot on an optical disk (1) using the light from the laser; a detector (26) that detects output power of the laser and generates a laser power detection signal; a laser power control circuit (27) that controls the output power of the laser using the laser power detection signal; a detector (10) that detects a gap length between the optical disk and the SIL and generates a gap detection signal; and a gap control circuit (15) that controls the gap length between the optical disk and the SIL using the gap detection signal. The power control circuit has a gain crossover frequency greater than a gain crossover frequency of the gap control circuit.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: October 7, 2014
    Assignee: Panasonic Corporation
    Inventors: Ryutaro Futakuchi, Shigeru Furumiya
  • Patent number: 8842507
    Abstract: A thermally-assisted magnetic recording (HAMR) disk drive uses a thermal sensor to accurately monitor laser power during writing. The disk drive controller, or a separate processor, computes a prediction of the laser power from a history of laser power settings. This predicted value is compared with the measured value from the thermal sensor. If the difference is too large or too small, indicating that the laser power is too high or too low, an error signal is sent to the disk drive controller. The disk drive controller may adjust the laser power setting and initiate a re-write of the data. The predicted laser power is calculated from a convolution of a sequence of current and prior laser power settings with a sequence of coefficients. A calibration process generates the sequence of coefficients when the disk drive is idle or just after it is powered on.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: September 23, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Toshiki Hirano, Lidu Huang, Tetsuo Semba, Barry Cushing Stipe
  • Patent number: 8824263
    Abstract: When the power of the write pulse is taken as the peak power and the power of the bottom pulse is taken as the bottom power, the power setting device (114) sets the power of each pulse in the recording pulse train such that the peak power PwN of the Nth information layer which is closest to the light entry surface of the optical recording medium (11), the bottom power PbN of the Nth information layer, the peak power PwM of the Mth information layer (where M is an integer such that N>M?1), and the bottom power PbM of the Mth information layer satisfy the following formula: PbN/PwN>PbM/PwM.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: September 2, 2014
    Assignee: Panasonic Corporation
    Inventors: Tomoyasu Takaoka, Atsushi Nakamura, Tetsuya Akiyama, Naoyasu Miyagawa
  • Patent number: 8737185
    Abstract: An optical disc device is configured to reproduce an optical disc. The optical disc device includes an optical pickup and a driver. The optical pickup has a laser irradiation component that is configured to emit a laser beam to the optical disc for obtaining a return light. The driver is configured to generate a drive signal for driving the laser irradiation component based on a high-frequency signal. The driver is further configured to set an amplitude of the high-frequency signal used while reproducing a test region of the optical disc to be different from an amplitude of the high-frequency signal used while reproducing a data region of the optical disc. The test region of the optical disc is reproduced to acquire a setting signal for a setup of the optical pickup.
    Type: Grant
    Filed: May 9, 2013
    Date of Patent: May 27, 2014
    Assignee: Funai Electric Co., Ltd.
    Inventor: Kazuhiro Ichikawa
  • Patent number: 8730781
    Abstract: Provided are a light detecting element, and an optical pick-up device and an optical disc drive including the light detecting element. The light detecting element includes a terminal resistance unit that is provided between an amplification unit and an output port to limit an electric current of the output signal.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: May 20, 2014
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventor: Young-taek Kim
  • Patent number: 8724439
    Abstract: In an optical recording method, recording parameters (WU) to be used for recording are obtained using recommended recording parameter values (WR) read from an optical recording medium and previously obtained vector information (PC) and approximation coefficients (Ca, Cb) (S24). Writing to the optical recording medium is performed using the obtained recording parameters (S17). The vector information (PC) includes a vector component of the parameters obtained statistically with respect to parameter difference values (DF) between optimal recording parameter values (WO) and the recommended recording parameter values (WR) over a plurality of optical recording media so as to strengthen mutual correlation between the parameters.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: May 13, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomo Kishigami, Nobuo Takeshita
  • Patent number: 8699534
    Abstract: An optical disk drive system associated with a laser diode is described. The optical disk drive system comprises a current generator for receiving input signals; a current switch coupled to receive timing signals; a current driver coupled to receive output signals from the current switch and the current generator, the current driver further comprising a driver with wave shape control selected from the group consisting of a laser diode read driver and a laser diode write driver, wherein the driver with shape control is operative for transmitting at least one output signal that is a scaled version of at least one of the output signals received from the current generator, wherein the current driver is operative for transmitting at least one output signal driving the laser diode.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: April 15, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Douglas Warren Dean, Shengyuan Li, Indumini W. Ranmuthu
  • Publication number: 20140078878
    Abstract: The present invention provides a non-resonant two-photon absorption recording material containing a non-resonant polymer two-photon absorption compound, and the non-resonant two-photon absorption recording material wherein the main chain of the non-resonant polymer two-photon absorption compound contains at least one member selected from polystyrene, polyacrylate, polymethacrylate, polyester, polyurethane, polyether and polyimide, and also provides an optical information recording medium having a recording layer containing the recording material.
    Type: Application
    Filed: November 13, 2013
    Publication date: March 20, 2014
    Applicant: FUJIFILM CORPORATION
    Inventors: Hiroaki TSUYAMA, Masaomi MAKINO, Hidehiro MOCHIZUKI, Toshio SASAKI, Tatsuo MIKAMI
  • Publication number: 20140036651
    Abstract: A reproducing device includes a light generation and emission unit that obtains signal light as reflection light, which reflects recording signals of a land and a groove, by irradiating an optical recording medium with light and generates reference light so as to emit the signal light and the reference light in a superposed manner, a detection optical system that generates a first combination of signal light and reference light, a second combination of signal light and reference light, a third combination of signal light and reference light, and a fourth combination of signal light and reference light respectively, a light receiving unit in which the first to fourth combinations of signal light and reference light are respectively received by first to fourth light receiving elements, and a reproduction unit that reproduces the recording signals of the land and the groove on the basis of first to fourth light receiving signals.
    Type: Application
    Filed: July 30, 2013
    Publication date: February 6, 2014
    Applicant: SONY CORPORATION
    Inventors: Koji Sekiguchi, TAKAHIRO MIURA, KIMIHIRO SAITO
  • Publication number: 20140022881
    Abstract: A recording waveform is adjusted based on the fluctuation amount of the mark edge position, focused on that fluctuation of a mark edge position is increased in aged deterioration of a recording signal. Specifically, the recording waveform is adjusted such that a fluctuation amount becomes minimum or a threshold value or less. Then, information is recorded on the optical disc using the recording waveform. Further, provided is a recording medium or an information recording apparatus which stores parameters of the recording waveform.
    Type: Application
    Filed: May 10, 2013
    Publication date: January 23, 2014
    Applicants: Hitachi-LG Data Storage, Inc., Hitachi Consumer Electronics Co., Ltd.
    Inventors: Yoshitaka MORIMOTO, Soichiro ETO, Koichi WATANABE
  • Patent number: 8630158
    Abstract: A method for reducing a number of input terminals of an APC circuit is provided, where the APC circuit is arranged to control an optical pickup unit (OPU) within an optical storage device. The method includes: utilizing at least one switching module to ground one of a first and a second input terminals of the APC circuit at a time; and utilizing the switching module to electrically connect an APC front end within the APC circuit to a non-grounded input terminal of the first and the second input terminals, in order to receive a detection signal of a photo diode of the OPU through the non-grounded input terminal at the time. An associated APC circuit is also provided.
    Type: Grant
    Filed: June 13, 2010
    Date of Patent: January 14, 2014
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Cong Liu, Chih-Chien Huang
  • Patent number: 8625397
    Abstract: A reproduction method for reproducing a rewritable and readable optical information storage medium in such a manner that an information recording layer is disclosed. The reproduction method comprising: reading setting information of reproduction laser power for each information recording layer of the rewritable and readable optical information storage medium, the setting information being stored in the rewritable and readable optical information storage medium; and setting, based on the setting information thus read, reproduction laser power for the information recording layer that is closest to a reproduction-laser-incident surface to be not less than 1.0 mW but less than 1.1 mW.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: January 7, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masaki Yamamoto, Hirohisa Yamada, Yasuhiro Harada, Go Mori, Hideharu Tajima, Shigemi Maeda, Yoshitoru Murakami
  • Patent number: 8625402
    Abstract: Provided are a method of optical writing on a disc and a device adopting the method. The method of optical writing includes initially driving a laser diode (LD) at a preset reference value corresponding to a target output, detecting an actual output power by monitoring light output by the LD, and comparing the actual output power to the target output power. The method further includes compensating the reference value and writing data to the optical disc using the compensated reference value.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: January 7, 2014
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventor: Sang-jun Park
  • Patent number: 8625401
    Abstract: An optical drive laser diode drive current has a High Frequency Modulation (HFM) signal superimposed to aid optical medium readability. The HFM signal is provided by an HFM oscillator interfaced with the laser diode drive current to provide the HFM signal with a frequency from within a predetermined range. A frequency controller varies the frequency of the HFM signal over time to reduce RF emissions associated with the HFM signal. For instance, the HFM signal frequency is varied in a swept sawtooth or triangle pattern. As another example, the HFM frequency is varied with random selections of frequencies from a predetermined frequency range.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: January 7, 2014
    Assignee: Dell Products L.P.
    Inventor: David M. Pereira
  • Patent number: 8625399
    Abstract: Amplitude and frequency of a high-frequency signal superposed on a reproduction laser beam are changed in accordance with a reproduction spot diameter on the surface of the recording layer upon discrimination of an optical disk in initial adjustment after insertion of the optical disk and change of a layer of a multi-layer optical disk. Further, the high-frequency signal is not superposed on the reproduction laser beam until end of the discrimination and change to a target layer upon discrimination of the optical disk and change of a layer of a multi-layer optical disk.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: January 7, 2014
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Koichiro Nishimura, Masayuki Inoue
  • Publication number: 20140003222
    Abstract: An optical disk apparatus has: a laser (14) that outputs light; an optical system that includes an SIL (2) for forming a predetermined sized beam spot on an optical disk (1) using the light from the laser; a detector (26) that detects output power of the laser and generates a laser power detection signal; a laser power control circuit (27) that controls the output power of the laser using the laser power detection signal; a detector (10) that detects a gap length between the optical disk and the SIL and generates a gap detection signal; and a gap control circuit (15) that controls the gap length between the optical disk and the SIL using the gap detection signal. The power control circuit has a gain crossover frequency greater than a gain crossover frequency of the gap control circuit.
    Type: Application
    Filed: March 16, 2012
    Publication date: January 2, 2014
    Inventors: Ryutaro Futakuchi, Shigeru Furumiya
  • Patent number: RE45001
    Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into ?1T, ?1T, ?1T, ?2T, ?2T, . . . , ?iT, ?iT, . . .
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: July 8, 2014
    Assignee: Mitsubishi Kagaku Media Co., Ltd.
    Inventors: Natsuko Nobukuni, Michikazu Horie