Stored And Retrieved Testing Signal Patents (Class 369/47.53)
  • Patent number: 10217483
    Abstract: Provided is a technique that reduces the possibility that data will not be recorded due to a shortage of test areas. A test area, in which test writing for laser power control is performed, is set in each recording layer of an optical recording medium having a plurality of recording layers, and information indicating a position of the set test area is recorded on the optical recording medium. Furthermore, recorded information of an optical recording medium is reproduced, the optical recording medium including a plurality of recording layers and in which a test area, in which test writing for laser power control is performed, is set in each of the recording layers and information indicating a position of the set test area is recorded; and the information indicating the position of the test area is acquired.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: February 26, 2019
    Assignee: SONY CORPORATION
    Inventor: Kazuki Ikuta
  • Patent number: 9893232
    Abstract: The invention provides an optoelectronic semiconductor component and a method for producing an optoelectronic semiconductor component (10), comprising the following steps: A) arranging at least one semiconductor chip (2) on a carrier (1), B) applying an electrically insulating photoresist (3) to a top side (1a) of the carrier (1) and to the semiconductor chip (2), C) curing the photoresist (3) with a baking step, D) patterning the photoresist (3) by exposure, F) developing the photoresist (3), wherein the photoresist (3) is removed at least from a radiation penetration surface (2b) of the semiconductor chip (2), G) again curing the photoresist (3) with a baking step, and H) applying an electrically conductive contact layer (4) to the photoresist (3), wherein the electrically conductive contact layer (4) is in places at a distance (A) from a marginal surface (3a) of the photoresist (3) which faces towards the semiconductor chip (2), wherein the marginal surface (3a) facing towards the semiconductor chip (2) is
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: February 13, 2018
    Assignees: OSRAM Opto Semiconductors GmbH, OSRAM GmbH
    Inventors: Bernd Boehm, Daniel Zaspel, Stefan Hartauer, Bjoern Hoxhold
  • Patent number: 9741383
    Abstract: A track of an optical disk is formed by wobbling and divided into zones, a clock ratio of a recording clock to a wobble clock is preset for each zone, a wobble signal is detected from the optical disk, the wobble clock is generated from the wobble signal, a present position is identified by reproducing ADIP indicating a position of the track from the wobble signal and the wobble clock, the recording clock is generated with respect to the wobble clock, a data address present position is identified from the present position, a start end position of the ADIP in a recording target zone, a start end position of the data address in the recording target zone, and the clock ratio, a recording start position is identified based on the data address present position; and the data is recorded from the recording start position of the recording target zone.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: August 22, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kohei Nakata, Yasumori Hino, Harumitsu Miyashita, Junichi Minamino, Yoshihisa Takahashi
  • Patent number: 9552846
    Abstract: A data storage device can be tested while spinning at a variety of different speeds. Data may be written to a data sector with a transducing head while at least one disk of a data storage device spins about a spindle at a default speed. One or more tests can subsequently be executed on the disk by reading servo data stored on the disk while the disk spins at a test speed that is greater than the default speed.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: January 24, 2017
    Assignee: Seagate Technology LLC
    Inventor: Teck Khoon Lim
  • Patent number: 9418694
    Abstract: A mark having a length nT (n being an integer equal to or greater than 3 and T being a clock period) is formed by modulating irradiation laser power with three values of recording power Pw, erase power Pe, and bias power Pb (Pw>Pe>Pb). Constant strength periods (At) of the recording power Pw are set as AtT, A1T, . . . , and AmT and constant strength periods (Bt) of the bias power Pb are set as BtT, B1T, . . . , BmT, and CT (C=?1 to 3). The application of laser is divided into pulses in order of AtT, BtT, A1T, B1T, . . . , AmT, BmT, and CT (m=(n?k)/2, k=3 (if n is an odd number), or k=4 (if n is an even number)). (Here, the constant strength period of the recording power Pw for n=3, n=4, n?5 (odd number), and n?6 (even number) is set as At3, At4, Atod, and Atev, the constant strength period of the bias power Pb for n=3, n=4, n?5 (odd number), and n?6 (even number) is set as Bt3, Bt4, Btod, and Btev, and then, At3+Bt3=Atod+Btod=Am+Bm=2T and At4+Bt4=Atev+Btev=3T).
    Type: Grant
    Filed: April 6, 2015
    Date of Patent: August 16, 2016
    Assignee: JVC KENWOOD CORPORATION
    Inventors: Hiroshi Tabata, Kazuo Yonehara, Yasuhiro Ueki
  • Patent number: 9384774
    Abstract: A data storage device is disclosed comprising a disk and a head actuated over the disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk. The laser power is adjusted and a pattern is written to a target track at the adjusted laser power. The pattern is read from the target track to generate a read signal, and a quality metric is generated based on the read signal. The process is repeated at least once, and a write power for the laser is configured based on a slope of the quality metric.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: July 5, 2016
    Assignee: Western Digital Technologies, Inc.
    Inventors: Poornima Nookala, Phillip Scott Haralson
  • Patent number: 9286929
    Abstract: A method for performing recording on a multilayered optical disk which has three or more recordable or rewritable information recording layers with a first recording layer and a second recording layer located nearer to a light incident surface than the first recording layer, and which respectively has a first test area configured by a plurality of segments in the first recording layer and in the second recording layer, wherein a predetermined radial distance L is defined beforehand. When an arbitrary segment in the second test area is test-recorded, a segment in the first test area, the radial distance of which from the recorded test area in the second test area is within the range of the predetermined radial distance L, is set as a segment in which test recording is not performed.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: March 15, 2016
    Assignee: HITACHI CONSUMER ELECTRONICS CO., LTD.
    Inventors: Harukazu Miyamoto, Koichi Watanabe, Yutaka Nagai, Koichiro Nishimura, Takakiyo Yasukawa
  • Patent number: 9153272
    Abstract: At least one laser input current is applied to a laser in a heat assisted magnetic recording device. Laser output power of the laser is measured at the at least one applied laser current. A relationship is characterized amongst temperature, applied laser input current and laser output power. Laser current is set to an optimal laser current as determined at manufacturing. A metric of recording performance is measured to determine if the relationship is acceptable.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: October 6, 2015
    Assignee: Seagate Technology LLC
    Inventors: Tim Rausch, Jon D. Trantham, John W. Dykes, Won Choul Yang
  • Publication number: 20150092527
    Abstract: An optical disc apparatus includes a plurality of optical heads; an optical head control section that performs an optical output configuration process for each of the plurality of optical heads by using a test writing region provided in an optical disc, wherein the optical output configuration process sets an optimum recording power for each of the plurality of optical heads; and an integrated control section that controls the optical head control section such that a first optical output configuration process for each of the plurality of optical heads is performed in parallel and a second optical output configuration process is performed for at least one optical head of the plurality of optical heads based on a result of the first optical output configuration process.
    Type: Application
    Filed: September 19, 2014
    Publication date: April 2, 2015
    Inventor: Toshiyuki Murayama
  • Patent number: 8929186
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, wherein the head comprises a laser operable to heat the disk while writing data to the disk. A laser power of the laser is initialized, and a test pattern is written to the disk. The test pattern is read from the disk to generate a read signal, and a quality metric and a track width of the test pattern is measured based on the read signal. The laser power is adjusted and the process is repeated until at least one of the quality metric substantially matches a target value and the track width substantially matches a track width threshold.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: January 6, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Abhimanyu Sharma, Poornima Nookala, Zhaobin Zhu
  • 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: 8811134
    Abstract: Methods, software, and apparatuses for reading from and/or writing to an optical storage medium. The methods generally include steps for reading a region of an optical storage medium to produce a readback signal, processing predetermined pattern data to produce one or more measurement instructions, measuring one or more characteristics of the readback signal in response to the measurement instructions to produce one or more measurement results, and further processing the readback signal in accordance with one or more of the measurement results. Thus, the ability to flexibly set test parameters and to quickly and accurately test the write characteristics of a recordable or re-writable optical storage medium is provided.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: August 19, 2014
    Assignee: Marvell International Ltd.
    Inventors: Pantas Sutardja, William R. Foland, Jr.
  • Patent number: 8773788
    Abstract: Various embodiments of the present invention provide systems and methods for calibrating write pre-compensation values.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: July 8, 2014
    Assignee: LSI Corporation
    Inventors: Ming Jin, Shaohua Yang, Haitao Xia, Fan Zhang
  • Patent number: 8755137
    Abstract: According to one embodiment, there is provided a disk drive. In the disk drive, a calibration module calibrates a write condition using a first area in a sequential access area on a disk to which data is to be written next time as a calibration area if the calibration is required. A manager enters the calibration area in a management table in association with a physical address of the first area used as the calibration area. A sequential write module continues a sequential writing from a second area following the first area based on skipping the first area.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: June 17, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuto Kashiwagi, Takeyori Hara
  • 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: 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: 8699308
    Abstract: Provided are a test method for an information storage medium and a recording and reproducing method using the test method. The test method includes recording a test signal in an optimum power control (OPC) zone formed in either a lead-in area or a lead-out area of the information storage medium, and recording the test signal in a protection zone formed in the other of the lead-in area and the lead-out area.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: April 15, 2014
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventor: Sang-whook Kim
  • Patent number: 8654620
    Abstract: In write power adjustment for an optical disc having a plurality of information storage layers, data of trial writing is varied by the influence of layers other than a target layer. It is difficult, therefore, to determine optimal write power. A modulation M[m] is obtained from a reproduction signal amplitude of a signal subjected to the trial writing performed with use of write powers Pw[m] (m being an integer) of a plurality of kinds. At least an optimum write power intercept Pint_opt is determined by fitting a relation between the Pw[m] and the M[m] by a modulation characteristic formula M=Masy×(1?(Pint?Pasy)/(Pw?Pasy)) having an asymptotic modulation Masy, a write power intercept Pint, and an asymptotic write power Pasy as parameters. Approximation accuracy by the fitting and/or quality of the trial writing signal are evaluated with use of at least the M[m], the modulation characteristic formula, and the Pint_opt.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: February 18, 2014
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Soichiro Eto, Koichi Watanabe, Harukazu Miyamoto
  • Patent number: 8625222
    Abstract: A hard disk drive or other disk-based storage device comprises a storage disk, a read/write head configured to read data from and write data to the disk, and control circuitry coupled to the read/write head and configured to process data received from and supplied to the read/write head. The control circuitry comprises calibration circuitry configured to vary a phase of a clock signal as a test pattern is written to the storage disk as part of a calibration procedure, and disk locked clock circuitry coupled to the calibration circuitry and configured to obtain phase lock between the clock signal and a timing pattern on a surface of the storage disk. The calibration circuitry is further configured to determine an initial phase update value to be applied by the disk locked clock circuitry in a control loop as the phase of the clock signal is varied as part of the calibration procedure.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: January 7, 2014
    Assignee: LSI Corporation
    Inventor: Jeffrey P. Grundvig
  • Patent number: 8611197
    Abstract: Provided is an optical write device and method. The optical recording method includes generating a first signal including a preset write pulse power Pm in response to information to be written, generating a second signal including an over drive pulse power Po that is synchronized with the preset write pulse power Pm and which is at a higher level than the preset write pulse power Pm, and writing the information to an optical disc using a driving signal that is obtained by synthesizing the first and second signals.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: December 17, 2013
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Won-ik Cho, Nag-eui Choi, Seung-ki Kim, Ho-jin Kang
  • Patent number: 8599663
    Abstract: An approach is described that allows an optical disc drive to accurately verify the power level of irradiation beam power levels associated a write strategy used in high speed, high density optical disc media formats using a front monitor diode with a relatively slow rise time and/or relative slow fall time compared to the clock cycle speed of the write strategy signal. A portion of encoded data to be written to an optical disc media may be overwritten to include a predetermined data pattern. During write strategy processing of the data, the predetermined data pattern is replaced with a constant write strategy power level. The constant write strategy output placed within the write strategy signal may control the optical disc drive laser to emit a constant irradiation beam for a duration sufficiently long to allow the front monitor diode to obtain an accurate measure of the irradiation beam power level.
    Type: Grant
    Filed: October 7, 2008
    Date of Patent: December 3, 2013
    Assignee: Marvell International Ltd.
    Inventor: Tom Geukens
  • Patent number: 8559284
    Abstract: Methods, software, and apparatuses for reading from and/or writing to an optical storage medium. The methods generally include steps for reading a region of an optical storage medium to produce a readback signal, processing predetermined pattern data to produce one or more measurement instructions, measuring one or more characteristics of the readback signal in response to the measurement instructions to produce one or more measurement results, and further processing the readback signal in accordance with one or more of the measurement results. Thus, the ability to flexibly set test parameters and to quickly and accurately test the write characteristics of a recordable or re-writable optical storage medium is provided.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: October 15, 2013
    Assignee: Marvell International Ltd.
    Inventors: Pantas Sutardja, William R. Foland, Jr.
  • Patent number: 8547811
    Abstract: With a large capacity of an optical disk and high-speed recording, a frequency of a recording signal is increased and a pulse width is narrowed. In the case that a laser is driven by a signal having the short pulse width, unfortunately the high-speed recording is hardly performed to an optical disk when a rise time and a fall time of the optical pulse are lengthened. During user data recording, a bottom driving current is set to a second bottom driving current value that is a current value of a threshold or less, so that the rise time and the fall time of the optical pulse can be shortened to perform the high-speed recording of the optical disk.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: October 1, 2013
    Assignee: Panasonic Corporation
    Inventors: Kenji Fujiune, Takeharu Yamamoto
  • Patent number: 8542563
    Abstract: There is proposed an optical disk recording method that can prevent degradation of recording quality due to occurrence of thermal interference, and an optical disk recording reproduction device used in this recording method.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: September 24, 2013
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Katsuhiro Oyama, Fuyuki Miyazawa, Daizo Yokoyama
  • Patent number: 8498186
    Abstract: The present disclosure relates to methods, software, and apparatuses for correcting reading and/or writing operations in an optical storage medium. The methods generally include reading a region of an optical storage medium to produce a readback signal, measuring timing offsets for a plurality of the data edges (including one or more non-guide edges), and storing an offset correction for at least one of the plurality of edges based on a measured offset of at least one of the plurality of edges relative to a predetermined offset. The disclosure advantageously enables precise measurement of timing offsets in optical storage media and correction of the measured offsets for timing offsets attributable to edge jitter, timing loop drift, or factors independent of variations in the medium and/or write operation characteristics.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: July 30, 2013
    Assignee: Marvell World Trade Ltd.
    Inventor: William R. Foland, Jr.
  • Patent number: 8488424
    Abstract: Laser write parameters in an optical drive are calibrated. A parameter range for the write parameters is set based on a recordable medium, and a number of test runs are recorded on the recordable medium while varying the write parameters. Write performance characteristics over the test runs are measured. Based on the measured performance characteristics, actual write parameters are selected for use in writing actual data.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: July 16, 2013
    Assignee: Marvell International Ltd.
    Inventors: Peter Kivits, Julie Faminial, Jake Ballares, Jents Temmerman
  • Patent number: 8483026
    Abstract: To ensure a favorable recording characteristic for a write-once recording medium for a bluish-purple laser, an optical information recording apparatus includes ways to write power to form recording marks, a space forming power to form spaces, a pulse width of a cooling pulse and ways to record information onto the optical information recording medium according to the setting of the write power, the setting of the space forming power and the setting of the pulse width of the cooling pulse. At this time, the pulse width of the cooling pulse and a ratio whose numerator is the write power and whose denominator is the space forming power have a preferable region of the recording characteristic, and information is recorded onto the optical recording medium by using values in this range.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: July 9, 2013
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Fuyuki Miyazawa, Hiroya Kakimoto, Katsuhiro Oyama
  • Patent number: 8477579
    Abstract: A writing method for an optical disk drive includes receiving a command to write a disc; implementing an optimum power control (OPC) test for a predetermined data transfer rate to obtain a relation of a beta parameter to writing power; acquiring a writing power for the predetermined data transfer rate with a target beta parameter; calculating the energy area ratio of writing strategies for every data transfer rate; multiplying the energy area ratio by the writing power for the predetermined data transfer rate to produce the writing power for every data transfer rate; and compensating the writing power with automatic writing control.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: July 2, 2013
    Assignee: Quanta Storage Inc.
    Inventors: Po-Wei Lee, Ting-Gui Peng, Song-Rui Chen
  • Patent number: 8472293
    Abstract: In write power adjustment for an optical disc having a plurality of information storage layers, data of trial writing is varied by the influence of layers other than a target layer. It is difficult, therefore, to determine optimal write power. A modulation M[m] is obtained from a reproduction signal amplitude of a signal subjected to the trial writing performed with use of write powers Pw[m] (m being an integer) of a plurality of kinds. At least an optimum write power intercept Pint_opt is determined by fitting a relation between the Pw[m] and the M[m] by a modulation characteristic formula M=Masy×(1?(Pint?Pasy)/(Pw?Pasy)) having an asymptotic modulation Masy, a write power intercept Pint, and an asymptotic write power Pasy as parameters. Approximation accuracy by the fitting and/or quality of the trial writing signal are evaluated with use of at least the M[m], the modulation characteristic formula, and the Pint_opt.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: June 25, 2013
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Soichiro Eto, Koichi Watanabe, Harukazu Miyamoto
  • Patent number: 8462601
    Abstract: Aspects of the disclosure can provide a method to optimize optical recording. The method can include recording a pre-defined pattern on an optical medium according to a first write strategy, measuring edge timings corresponding to the pre-defined pattern recorded on the optical medium, determining a second write strategy including at least timing modifications to the first write strategy, and recording data on the optical medium according to the second write strategy. The timing modifications can be determined based on the measured edge timings, edge timing targets for desired edge timings and edge timing sensitivities to the timing modifications.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: June 11, 2013
    Assignee: Marvell International Ltd.
    Inventor: Peter J. Kivits
  • Patent number: 8456974
    Abstract: The present invention achieves tracking servo using a recording signal on a grooveless optical disc. Trial writing signals are written by using multiple recording conditions, and a recommended recording condition having favorable qualities of a reproduction signal and a tracking error signal is determined based on the trial writing signals. Then, recording is performed by using the recommended recording condition. In addition, by using a recording condition determined based on an optimum power control performed prior to the recording, signals are recorded adjacent to each other in at least two tracks. Signals are recorded by using the determined recording condition under which a tracking error signal quality obtained from the recording signal matches a desired value of a tracking error signal quality of the medium.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: June 4, 2013
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Soichiro Eto, Takahiro Kurokawa
  • Patent number: 8456973
    Abstract: Embodiments disclosed herein relate to an optical disc drive test. In one embodiment, an optical disc drive of a host electronic device performs a test on itself. The host electronic device requests information about the test from the optical disc drive. The optical disc drive reports information about the test in response to the request.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: June 4, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Ming Hee Wong, Khanh Gia Tran, Kenneth A Kotyuk
  • Publication number: 20130128708
    Abstract: Provided are a test method for an information storage medium and a recording and reproducing method using the test method. The test method includes recording a test signal in an optimum power control (OPC) zone formed in either a lead-in area or a lead-out area of the information storage medium, and recording the test signal in a protection zone formed in the other of the lead-in area and the lead-out area.
    Type: Application
    Filed: November 15, 2012
    Publication date: May 23, 2013
    Inventor: Sang-whook Kim
  • Patent number: 8446805
    Abstract: A disc-shaped information recording medium includes a laminate of recording layers on and from which an information signal can be optically recorded and reproduced from one side of the medium. Data areas are provided in the recording layers, respectively. The information signal can be recorded on and reproduced from the data areas while a laser beam emitted from an optical pickup is applied to the data areas. Optical recording test areas are provided in the recording layers, respectively. A test signal can be recorded on and reproduced from the optical recording test areas to decide optimum power values of the laser beam for signal recording. The test areas are out of overlap as viewed in a direction of propagation of the laser beam.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: May 21, 2013
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Yasuhiro Ueki
  • Patent number: 8416661
    Abstract: According to one embodiment, an optical disk device includes types of semiconductor laser diodes configured to emit laser light of different wavelengths, an output control circuit configured to control light output of each semiconductor laser diode, and a composite power source configured to generate voltages required for driving the types of semiconductor laser diodes and operating the output control circuit from a single power source voltage and to selectively output the generated voltages. The composite power source includes an input port to input an external control signal at a time of voltage selection and is configured to change the output voltage stepwise in response to the control signal.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: April 9, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Manabu Murakami, Shigeru Fukinuki, Naoki Kimura
  • Patent number: 8416660
    Abstract: There is provided a method of calculating the degradation over time of the quality of data recorded on an optical disk in a short time. In the method, when user data is recorded on a data area, a test signal including a component in which the signal level is smaller than a reference value, is recorded on a test area. Then, the test signal is reproduced from the test area when a predetermined time has passed, to calculate the quality degradation of the user data from the evaluation result. Alternatively, every time when the user data is recorded/reproduced on/from the data area, the test signal is recorded/reproduced repeatedly on/from the test area. Then, the test signal is reproduced from the test area at a predetermined timing, to calculate the quality degradation of the user data from the evaluation result.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: April 9, 2013
    Assignees: Hitachi-LG Data Storage, Inc., Hitachi Consumer Electronics Co., Ltd.
    Inventors: Masaaki Kurebayashi, Shinji Fujita, Osamu Kawamae
  • Patent number: 8411539
    Abstract: An optical disc recording device, wherein, during an OPC process addressing a write-once optical disc provided with only one or two recording layers, a recording power value of an optical pickup is changed within a range from (100?A) % of a reference recording power value to (100+B) % of the reference recording power value, and wherein, during an OPC process addressing a write-once optical disc provided with three or more recording layers of the same type as the aforementioned write-once optical disc, the recording power value of the optical pickup is changed within a range from (100?C) % of a reference recording power value to (100+D) % of the reference recording power value, D being set to be less than B.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: April 2, 2013
    Assignee: Funai Electric Co., Ltd.
    Inventor: Takayuki Ono
  • Patent number: 8406105
    Abstract: A model is derived for write parameters of a laser in an optical drive. A parameter range for the write parameters is set based on a recordable medium. A number of test runs are recorded on the recordable medium while varying the write parameters. Write performance characteristics are measured over the test runs, and a model of write performance as a function of the write parameters is derived. Values for write parameters are selected for use in writing actual data based on the derived model. A first section of user data is written to the data-carrying region of the recordable medium using the selected values. The write performance characteristics of the first section of user data are measured, and the model is updated by including the measurements from the data-carrying region. New values for the write parameters of the laser are selected based on the updated model.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: March 26, 2013
    Assignee: Marvell International Ltd.
    Inventors: Peter Kivits, Jents Temmerman
  • Patent number: 8395977
    Abstract: Aspects of the disclosure provide a method for power calibration. The method includes writing, using a power configuration, a second pattern over a first pattern on a rewritable storage medium. The first pattern includes at least a first symbol and a second symbol while the second pattern does not include the second symbol. Thus, the second symbol in the first pattern is erased according to the power configuration. Then, the method includes reading the rewritable storage medium to measure remaining amplitude of the second symbol in the first pattern.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: March 12, 2013
    Assignee: Marvell International Ltd.
    Inventors: Jents Temmerman, Gary Christopher Maul
  • Patent number: 8391115
    Abstract: Systems, methods and compute program products for compensating for asymmetry variations are described. The asymmetry variations may be monitored both circumferentially and radially across an optical storage medium such that effects of the asymmetry variations may be compensated or minimized. In some implementations, effects of asymmetry variations may be compensated or minimized by first determining light reflected from a circumferential location of an optical storage medium. Then, at least one quality measure based on the detected light is determined. The correlation may be established based on the at least one quality measure and a corresponding circumferential location. A power level of a light source that emits the light is then adjusted based on the correlation.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: March 5, 2013
    Assignee: Marvell International Ltd.
    Inventor: William R. Foland, Jr.
  • Patent number: 8391116
    Abstract: An optical disc recording method of determining a disc address when write and read operations are performed for an optical disc during recording power calibration in an optical disc recording apparatus having at least two optical head units including first and second optical head units is disclosed. The method includes: determining a first recording power calibration start address, which is an address at which the first optical head unit starts calibration of the recording power, from a power calibration area provided in advance as an area used to calibrate the recording power; and determining an address obtained by adding a range of the power calibration area used to calibrate the recording power to the first recording power calibration start address as a second recording power calibration start address, which is an address at which the second optical head unit starts calibration of the recording power.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: March 5, 2013
    Assignee: Sony Corporation
    Inventor: Toshiyuki Murayama
  • Patent number: 8385175
    Abstract: Medium recording and reproduction apparatus and method can prevent prohibition of disc recording due to the fact that laser power calibration area becomes unusable by studying a management information update method during data recording. When usable capacity of the laser power calibration area is monitored and the capacity is reduced, management information area to be currently updated is changed to another layer.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: February 26, 2013
    Assignees: Hitachi-LG Data Storage, Inc., Hitachi Consumer Electronics Co., Ltd.
    Inventors: Kenji Akahoshi, Atsushi Fuchiwaki
  • Patent number: 8385167
    Abstract: A method of reproducing data from an information storage medium having a plurality of recording layers, each layer having a user data area, on which data is recordable by a pickup. A first amount of data is reproduced from a recording layer located closest to the pickup and lesser amounts of data than the first amount of data are reproduced from other ones of the plurality of recording layers. The amount of data reproduced from each of the other ones of the plurality of recording layers progressively decreases from the recording layer closest to the pickup to a recording layer farthest from the pickup.
    Type: Grant
    Filed: May 10, 2006
    Date of Patent: February 26, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyung-geun Lee, Wook-yeon Hwang
  • Patent number: 8369195
    Abstract: An information storage medium and a method and apparatus for recording/reproducing data on/from the information storage medium. The information storage medium includes a plurality of recording layers, each having a user data area, on which data can be recorded by a pickup. Data is recorded in the order of recording layers from closest to farthest from the pickup, and a recordable region in a user data area of a recording layer on which data is to be recorded is smaller than that in a recording layer between the pickup and the recording layer on which data is to be recorded. Each recording layer contains a recordable region in a user data area and a optimum power control (OPC) area in order to maintain the same recording/reproducing characteristics between the plurality of recording layers.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: February 5, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyung-geun Lee, Wook-yeon Hwang
  • Publication number: 20130021886
    Abstract: An optical disc recording device, wherein, during an OPC process addressing a write-once optical disc provided with only one or two recording layers, a recording power value of an optical pickup is changed within a range from (100?A)% of a reference recording power value to (100+B)% of the reference recording power value, and wherein, during an OPC process addressing a write-once optical disc provided with three or more recording layers of the same type as the aforementioned write-once optical disc, the recording power value of the optical pickup is changed within a range from (100?C)% of a reference recording power value to (100+D)% of the reference recording power value, D being set to be less than
    Type: Application
    Filed: July 12, 2012
    Publication date: January 24, 2013
    Inventor: Takayuki ONO
  • Patent number: 8345523
    Abstract: Aspects of the disclosure can provide a method to optimize optical recording. The method can include recording a pre-defined pattern on an optical medium according to a first write strategy, measuring edge timings corresponding to the pre-defined pattern recorded on the optical medium, determining a second write strategy including at least timing modifications to the first write strategy. The timing modifications can be determined based on means and variances of the measured edge timings, edge timing means and variances targets for desired edge timings, and edge timing sensitivities to the timing modifications.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: January 1, 2013
    Assignee: Marvell International Ltd.
    Inventor: William R. Foland, Jr.
  • Publication number: 20120320725
    Abstract: An optical recording medium driving apparatus includes: a driving signal generating unit that generates a driving signal for driving a laser beam source; a high frequency superposition unit that performs high frequency superposition on the driving signal; a light receiving unit that receives an optical feedback of a laser beam; an evaluation signal generating unit that generates an evaluation signal from a light reception signal; a storage unit that stores first high frequency superposition amount information corresponding to a high frequency superposition amount for a normal reproduction mode and second high frequency superposition amount information corresponding to an amount that is greater than that represented by the first high frequency superposition amount information; and a superposition amount control unit that performs control so that a high frequency superposition amount based on the second high frequency superposition amount information is set when measuring an evaluation index based on the evalua
    Type: Application
    Filed: June 6, 2012
    Publication date: December 20, 2012
    Applicant: SONY CORPORATION
    Inventors: Seiichirou Miyaki, Tomoya Ozaki
  • Patent number: 8320223
    Abstract: An optical storage apparatus and a method for eliminating a write power transient thereof are provided. The method includes following steps. First, a target voltage level of a write voltage when next time the optical storage apparatus writes data is obtained. Then, a command value is updated by using the target voltage level according to a relationship between the command value and the write voltage. Next, the write voltage of the optical storage apparatus is pre-charged to the target voltage level according to the updated command value. Thereby, the write power transient of the optical storage apparatus can be eliminated.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: November 27, 2012
    Assignee: Sunplus Technology Co., Ltd.
    Inventor: Yao-Wen Liu
  • Patent number: 8320231
    Abstract: A recording apparatus that performs recording of data on a disc-shaped recording medium including a recording area, which is capable of recording user data therein, and a replacement area, which is replaced by a defect area included in the recording area, includes a setting section configured to replace a portion of the recording area by the replacement area, and set the portion of the recording area as an area for adjustment, and an adjustment section configured to perform adjustment by using the area for adjustment.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: November 27, 2012
    Assignee: Sony Corporation
    Inventor: Yoshihiro Horibata
  • Patent number: 8305854
    Abstract: An optical disc drive according to the present invention includes an optical pickup and a writing control section for instructing the optical pickup to record a mark, representing the information to be written, on the optical disc. In recording the mark on the optical disc, the writing control section instructs the optical pickup to irradiate the same area on the optical disc with a light beam a plurality of times so that the mark is recorded in that repeatedly irradiated area.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: November 6, 2012
    Assignee: Panasonic Corporation
    Inventors: Hiroshi Kayama, Kazuo Momoo