| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369530350 | Signal error correcting or detecting | 45 |
| 20080232217 | METHOD AND OPTICAL DISC DRIVE FOR ACCESSING DATA ON OPTICAL STORAGE MEDIUM - A method and optical disc drive for accessing data on optical storage medium are provided. The optical disc drive includes a sled motor and an optical pickup head. When the sled motor performs a track positioning, the optical pickup head uses a differential astigmatic detection (DAD) method to generate a focus error signal. When the track positioning is finished, the optical pickup head is switched to an astigmatic detection (AD) method to generate the focus error signal to assist to access data on an optical storage medium. Therefore, it can greatly reduce reading and writing errors of the optical disc drive. | 09-25-2008 |
| 20090034384 | Detection Of Data Degeneration Within Optical Discs - A system and method for detecting degeneration in an optical media by defining a set of error correction code (ECC) blocks uniformly on an optical media and reading each of the ECC blocks to determine a number of correctable errors for each of the ECC blocks once the optical media is placed into use. The result of the reading of the ECC blocks is stored on the optical media. The reading of the ECC blocks can be a repetitive reading of each of the ECC blocks with the results for each of the ECC blocks averaged. Each ECC block from the set is readout several times and for each ECC block the average number of ECC Corrections is memorized also on disc. Degeneration of the optical should be uniform over the disc. By performing the reading of the ECC blocks over a long period of time, long term degradations of the disc can be determined and an indication made that data on the disc should be copied to another storage device. The set of ECC blocks are chosen uniform over the disc surface, so that scratches, blacks spot statically can be eliminated. | 02-05-2009 |
| 20090046555 | WRITE SIGNAL GENERATOR WITH DELAY CALIBRATION - An aligned write signal generator with alignment calibration utilizes an alignment unit to align a plurality of write signal. The aligned write signal generator includes a write signal generator for receiving an EFM signal and converting the EFM signal into a plurality of write signals according to a write strategy waveform generating rule, an alignment unit for receiving the plurality of write signals, aligning the write signals and outputting phase adjusted write signals, and a phase calibration unit for receiving the phase adjusted write signals, detecting phase error between the phase adjusted write signals, and outputting phase control signals. The alignment unit further receives the phase control signals to adjust the delay time of each write signal. | 02-19-2009 |
| 20090046556 | BIT DETECTION FOR OPTICAL DISC READING - A bit detector ( | 02-19-2009 |
| 20090103409 | COMPENSATING GAIN OF AN OPTICAL RECORDING APPARATUS - The present invention relates to an optical recording apparatus capable of recording information on an optical record carrier. Radial tracking control is performed by the 3 spot differential push pull (PP) method. The optical recording apparatus has means for obtaining a first and second difference signal from detection signals of a reflection of a main light beam (C) and a first and a second sub light beam (A,B), and means for subtracting the second difference signal from the first difference signal so as to obtain a tracking error signal (TES). The second difference signal is adjusted by a gain factor (g) so as to compensate for a difference in intensity between the reflected light of the first and the second sub light beams during information writing. In particular, a solution may compensate for the difference in the reflections for the first and second sub light beam (A,B) so that a possible radial offset is avoided. | 04-23-2009 |
| 20090103410 | Information recording medium, method and apparatus for recording and reproducing information - An information recording medium includes a lead-in area and a data area for storing contents information. The lead-in area includes a first lead-in information area and a second lead-in information area. The first lead-in information area corresponds to a first playback mode. The second lead-in information area corresponds to a second playback mode different from the first playback mode. The first lead-in information area has a first depth and is designed for storing lead-in information related to the contents information stored in the data area. The second lead-in information area includes pre-pits having a second depth greater than the first depth. The pre-pits represent predetermined information, such as information of copyright protection, related to the contents information stored in the data area. | 04-23-2009 |
| 20090129227 | METHOD FOR RECOVERING DATA IN DISK - A method for recovering video data in a disk when a reading error occurs is provided. First, the disk is scanned to obtain a next writable address (NWA) of a last video chapter previously recorded into the disk. An end address of a successfully recorded video chapter is then read from a specific area of the disk and stored into a memory. Next, when a disk player/recorder is requested to read content of data according to the NWA, the disk player/recorder determines whether the content of the data is a file system. If the content of the data is not a file system, the NWA obtained by scanning the disk is replaced with the end address read from the specific area to read the file system, so as to recover the video data in the disk. Thereby, the video data in the disk can be protected. | 05-21-2009 |
| 20090147645 | METHOD FOR INSPECTING OPTICAL INFORMATION RECORDING MEDIUM, INSPECTION APPARATUS, OPTICAL INFORMATION RECORDING MEDIUM AND RECORDING METHOD - A method for inspecting an optical information storage medium includes the steps of: irradiating the storage medium with a laser beam and rotating the medium by a constant linear velocity control technique by reference to the radial location at which the laser beam forms a spot on the medium; changing the rotational velocities according to the radial location on the medium between at least two linear velocities that include a first linear velocity Lv | 06-11-2009 |
| 20090154318 | Device and method for microstructuring a storage medium and storage medium comprising a microstructured region - A device providing for microstructuring a storage medium includes a radiation source for producing an at least partially coherent beam from electromagnetic radiation, a modulator-provided with a plurality of individually switchable modulator elements, a beam-forming optical element for illuminating the modulator, a reducing optical element for reducing a beam radiated by the modulator, and a transport table for displacing the storage medium in relation to the reducing optical element. The device solves technical problems caused by writing of microstructuring and individual diffractive optical elements, in particular computer-generated holograms having a high speed and high writing energy. The device is achieved in that the reducing optical element is configured with limited diffraction and produces a surface reduction of at least 25 from a surface of the individually switchable modulator elements. | 06-18-2009 |
| 20090154319 | OPTICAL DISC READING APPARATUS AND METHOD THEREFORE - An optical disc reading apparatus, such as a Near Filed optical disc reading apparatus, comprises a disc reader ( | 06-18-2009 |
| 20090185468 | PHASE ERROR DETECTION APPARATUS - A phase error detection apparatus capable of performing offset correction of a tracking error signal accurately even when there is a defect or a non-recorded position on an optical disc. There are provided a phase difference detection circuit ( | 07-23-2009 |
| 20090207710 | USE OF FEEDBACK ERROR AND/OR FEED-FORWARD SIGNALS TO ADJUST CONTROL AXES TO OPTIMAL RECOVERY POSITION OF HOLOGRAM IN HOLOGRAPHIC DATA STORAGE SYSTEM OR DEVICE - A method for adjusting at least one alignment control axis of a holographic data storage system or device to or towards a sufficiently optimal recovery position for recovery of a hologram based on a derived feedback error signal and/or a derived feed-forward signal. For the next hologram in the sequence, the derived feedback error signal estimates the direction and magnitude of misalignment of the at least one alignment control axis for one or more previously recovered holograms based on alignment-indicating data. The derived feed-forward signal estimates an optimal alignment value for the at least one alignment control axis for one or more holograms based on recording and recovery operating condition data for the holograms. An iterative alignment procedure may also be used to derive a feedback error signal for one hologram. | 08-20-2009 |
| 20090238054 | OPTICAL DISC DEVICE, TRACKING ERROR SIGNAL GENERATING CIRCUIT, TRACKING ERROR SIGNAL CORRECTING METHOD, AND PROGRAM - In a DPP-type tracking error signal (TE signal), an offset caused by the difference between the reflectance of a main-beam irradiated part and the reflectance of side-beam irradiated parts is appropriately compensated without individual normalization of an MPP signal and an SPP signal. An analog signal processing unit | 09-24-2009 |
| 20090245056 | OPTICAL DISK DEVICE AND CONTROL METHOD - According to one embodiment, an optical disk device includes a semiconductor laser, a circuit which generates a timing signal to determine a recording pulse timing, a circuit which sets a magnitude of a current for the laser, a circuit which switches the magnitude of the current according to the timing signal, a generation circuit which generates a correction signal from the timing signal to correct response characteristics of a recording pulse, a circuit which synthesizes the correction signal and signals obtained as the switch result to determine the magnitude of the current, and a circuit which feeds the current to the laser according to the synthesis result. The generation circuit extracts high-frequency components from the signals obtained as the switch result and the signal generated by the synthesis circuit, and switches a frequency and a signal gain of each of the components, in accordance with recording pulse conditions. | 10-01-2009 |
| 20090257333 | INTEGRATED CIRCUIT, OPTICAL DISK DEVICE, AND SIGNAL PROCESSING METHOD - Before initiation of tracking control, an optical disk device performs an offset amount obtaining operation, in which a difference between a middle value of the amplitude of a tracking error signal and a predetermined reference value is obtained as an offset amount. After the initiation of the tracking control, the optical disk device initiates an attenuation operation, in which an offset amount attenuation section attenuates the offset amount obtained by the offset amount obtaining operation to obtain an attenuated offset amount, while initiating, with an initial value being 0, an estimation operation, in which an observer estimates the offset amount according to a tracking driving signal to obtain an estimated offset amount. The optical disk device corrects the tracking error signal by using the attenuated offset amount obtained by the attenuation operation and the estimated offset amount obtained by the estimation operation. | 10-15-2009 |
| 20100074079 | OPTICAL DISK DRIVE - An optical disk drive includes a servo control unit | 03-25-2010 |
| 20100074080 | INFORMATION REPRODUCING APPARATUS AND METHOD, AND COMPUTER PROGRAM - An information reproducing apparatus ( | 03-25-2010 |
| 20100074081 | INFORMATION REPRODUCING APPARATUS AND METHOD, AND COMPUTER PROGRAM - An information reproducing apparatus ( | 03-25-2010 |
| 20100080100 | TRACKING ERROR SIGNAL DETECTION APPARATUS AND OPTICAL DISC APPARATUS - A DPD tracking error signal detection apparatus includes the following. Four differentiators remove DC components and differentiate four signal with varying differential phases. The signals are then sampled and quantized by four A/D converters, and output to a non-inverting unit and an inverting unit. A phase inverter/compositor then leaves as-is or phase-inverts the output signals, according to a control signal. The non-inverting and the inverting unit each include two Hilbert transformers that phase-shift the output from the A/D converters, two delay units that delay the output of the other A/D converters to match the delay of the Hilbert transformers, two cross-correlators that calculate the cross-correlation between pairs of Hilbert transformers and delay units, and an adding unit that combines the cross-correlator results and outputs the combined result to the phase inverter/compositor. | 04-01-2010 |
| 20100103790 | DISK RECORDING MEDIUM, DISK PRODUCTION METHOD, DISK DRIVE APPARATUS - A disk recording medium which can implement a recording method having a high degree of reliability for additional information is disclosed. The disk recording medium has a recording and reproduction region into and from which first data can be recorded and reproduced in accordance with a rewritable or write-once-read-many recording method and from which second data recorded in the form of wobbling of a groove can be reproduced. The second data includes address information and additional information. The additional information of the second data is coded in accordance with a first error correction method, and the coded additional information and the address information are recorded in a state coded in accordance with a second error correction method. | 04-29-2010 |
| 20100208562 | OPTICAL INFORMATION RECORDING DEVICE AND METHOD - In an optical information recording device and optical information recording method for angularly multiplexing and recording data on pages on the same recording region on a hologram disk, data on each page is sequentially generated by sequentially dividing input data in predetermined units, the pages to be recorded on the same recording region are divided into page groups so that pages to be recorded adjacently by the angular multiplexing may not belong to the same group, each page group is individually subjected to inter-page coding processing for computing an error-correcting code and adding the computed error-correcting code, and data on the pages subjected to the inter-page coding processing is angularly multiplexed and recorded on the hologram disk. | 08-19-2010 |
| 20100238778 | READING METHOD OF OPTICAL DISC DRIVE - The invention provides a reading method of an optical disc drive, which includes setting, reading, and decoding data, accumulating the error amount of the decoded data, setting to re-read the data when a reading failure occurs, adding one to the error amount, setting a low number of retry attempts for a high error amount and a high number of retry attempts for a low error amount based on the error amount, retrying to re-read the data if the number of retry attempts does not reach the predetermined number of retry attempts, and determining that the reading fails if the number of retry attempts reaches the predetermined number of retry attempts. | 09-23-2010 |
| 20100309766 | TRACKING CONTROL DEVICE, TRACKING CONTROL METHOD, AND OPTICAL DISC APPARATUS - The invention provides a tracking control device, a tracking control method, and an optical disc apparatus that enable to stably perform the tracking control, and reduce an influence of stray light from the other layer on the tracking control. A sub push-pull signal correcting section corrects a sub push-pull signal to be generated from returning light of a sub beam in such a manner that a track crossing component of a main push-pull signal to be generated from returning light of a main beam, and a track crossing component of the sub push-pull signal to be generated from the returning light of the sub beam are canceled. A low pass filter reduces a high frequency component of the sub push-pull signal corrected by the sub push-pull signal correcting section. A subtractor subtracts a sub push-pull signal passing the low pass filter from the main push-pull signal to thereby generate a tracking error signal. | 12-09-2010 |
| 20100309767 | OPTICAL INFORMATION RECORDING METHOD, OPTICAL INFORMATION RECORDING DEVICE AND OPTICAL INFORMATION RECORDING MEDIUM - The present invention provides an optical information recording apparatus and method capable of effectively determining appropriate recording parameters in a short time with favorable efficiency, when recording information onto an optical disk having different information recording conditions and information recording characteristics. An information recording condition or an information recording characteristic of an optical disk | 12-09-2010 |
| 20110007619 | OPTICAL DISC APPARATUS AND TRACKING CONTROL METHOD - An optical disc apparatus includes: a rotation section to rotate an optical disc including a spiral or concentric track with a predetermined track center, with a rotational center of the optical disc as the center; a light source to emit a light beam; an objective lens to collect the light beam on the optical disc; a lens drive section to drive the objective lens in a tracking direction; a light-receiving section to receive a reflected light beam and generate a light-receiving signal; a tracking error signal generation section to generate a first tracking error signal based on the light-receiving signal; an eccentric-state acquisition section to acquire an eccentric state of the track center; a correction section to generate a corrected tracking error signal; and a drive control section to drive the objective lens in the tracking direction by the lens drive section based on the corrected tracking error signal. | 01-13-2011 |
| 20110051579 | METHOD FOR CALIBRATING SIGNAL OFFSETS ON LIGHTSCRIBE DISC - A method for calibrating signal offsets on a lightscribe disc is provided. Spoke signals of an inner ring are utilized as a counter in order to read information pattern signals of an outer ring in a predetermined marked area. Measure the signal offsets of the information pattern signals. Check whether the number of the spoke signals of the inner ring exceeds a predetermined value. When the number of the spoke signals does not exceed the predetermined value, continue to measure the signal offsets; and when the number of the spoke signals reaches the predetermined value, calculate an average signal offset. The signal offsets of the information pattern signals of the outer ring can be calibrated by utilizing the average signal offset during a radial calibration or a decoding calibration. | 03-03-2011 |
| 20110063962 | REPRODUCING DEVICE AND REPRODUCING METHOD - A reproducing device includes: a laser light irradiating section; a correction coefficient information retaining section; a correction coefficient obtaining section; a laser power setting section; and a driving signal outputting section. | 03-17-2011 |
| 20110096652 | PHASE ERROR DETECTING DEVICE, WAVEFORM SHAPING DEVICE AND OPTICAL DISC DEVICE - A waveform shaping portion receives a digital reproduced signal generated from an analog reproduced signal reproduced from an information recording medium and shapes the waveform of the digital reproduced signal. A maximum likelihood decoding portion applies maximum likelihood decoding to the digital reproduced signal in the shaped waveform and generates a binarized signal indicating the result of the maximum likelihood decoding. A phase detection portion extracts, during the maximum likelihood decoding/a phase error using state transition patterns having only a single zero cross point among differential metrics at a plurality of merging points at which a set of paths branched from a given state merges. A synchronization detection portion generates a reproduction clock signal using the phase error that has been detected and brings the digital reproduced signal into synchronization with the reproduction clock signal that has been generated. This configuration makes it possible to generate a reproduction clock signal in a stable manner. | 04-28-2011 |
| 20110292781 | METHOD FOR DETECTING OBLIQUITY OF OPTICAL DISC DRIVE - A method for detecting the obliquity of an optical disc drive is provided. The method includes the steps of calibrating balance gains of TE signals and CE signals with predetermined obliquities of the optical disc drive, curve-fitting and storing a relating function between the predetermined obliquities and the balance gains, calibrating the balance gains of signals for an installed optical disc drive, and acquiring an calibrated balance gain to find the obliquity of the optical disc drive from the relating function. | 12-01-2011 |
| 20120014239 | OPTICAL DISK DEVICE, CONTROL METHOD THEREFOR, PROGRAM, AND INFORMATION RECORDING MEDIUM - Provided is an optical disc device capable of correcting a value of a control parameter during an operation of reading information from an optical disc medium. The optical disc device for reading the information recorded on the optical disc medium under an operation condition corresponding to a value set with respect to a predetermined control parameter corrects the value of the predetermined control parameter by repeatedly executing, while an operation of reading the information from the optical disc medium is being performed, processing of: acquiring, with respect to two values of the predetermined control parameter, evaluation values indicating accuracy of the reading of the information from the optical disc medium, respectively; and updating the value of the predetermined control parameter based on the two acquired evaluation values. | 01-19-2012 |
| 20130094339 | OBJECTIVE LENS, OPTICAL PICKUP DEVICE, AND OPTICAL DISC DEVICE - Provided is an objective lens including a diffraction portion provided on a laser beam incident plane or output plane. The diffraction portion includes first second, and third diffraction regions, wherein first laser beams corresponding to a first optical disc having a first transmissive layer are condensed on a data recording portion of the first optical disc, second laser beams corresponding to a second optical disc having a second transmissive layer thicker than the first transmissive layer are condensed on a data recording portion of the second optical disc, and third laser beams corresponding to a third optical disc having a third transmissive layer thicker than the second transmissive layer are condensed on a data recording portion of the third optical disc. An evaluation parameter calculated on the basis of an in-plane efficiency distribution function has a value corresponding to a symbol error rate that is less than a predetermined value. | 04-18-2013 |
| 20130128709 | MODULATED SIGNAL DETECTING APPARATUS AND MODULATED SIGNAL DETECTING METHOD | 05-23-2013 |
| 20130329538 | DEVICE AND METHOD FOR TESTING DISC PLAYER - A test method includes the steps of providing a test optical disc stored data that is reproduced to display a plurality of images having a plurality of single colors, the plurality of single colors comprising a plurality of first single colors; providing a first timer that begins counting for a first predetermined time when the disc player begins to read the test optical disc; displaying test images according to the video signals generated by the disc player that read the test optical disc. The test method further includes the steps of detecting the color of the test images, determining whether the currently detected color is substantially the same as one of the first single colors after the first timer has timed out; determining that the read performance of the disc player is unsatisfactory if the currently detected color is substantially the same as one of first single colors. | 12-12-2013 |
| 20130329539 | OPTICAL READ/WRITE APPARATUS - An optical read/write apparatus as an embodiment of the present invention includes: a light-splitting element configured to split a light beam emitted from a light source into multiple light beams including a write beam and a read beam; an optical system configured to converge the write and read beams onto the same track on an optical storage medium; a photodetector including a light receiving element configured to detect the read beam reflected from the optical storage medium and output an electrical signal; and a divider configured to generate a read signal by dividing the signal detected by the light receiving element by a signal that represents a write modulated component and that is obtained by detecting a part of the light beam emitted from the light source. | 12-12-2013 |
| 20140022878 | OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL INFORMATION PROCESSING APPARATUS - This invention allows super-resolution reproduction with which a better bER value is attainable, when information is recorded by a random pattern including a mark length not longer than a resolution limit, by use of a highly versatile signal decoding method. | 01-23-2014 |
| 20140086032 | INFORMATION RECORDING AND REPRODUCING DEVICE AND INFORMATION RECORDING AND REPRODUCING METHOD - An information recording and reproducing device has a recording section, a reproducing section, and a deterioration detection processor which detects deterioration of a signal quality of information recorded in a recording medium. The deterioration detection processor reproduces information recorded in a first area of the medium, using the reproducing section, to acquire first comparison information representing a signal quality, records information, using the recording section, in a second area of the medium different from the first area after the information recorded in the first area is recorded in the first area, and reproduces, using the reproducing section, the information recorded in the second area to acquire second comparison information representing a signal quality, and determines that the signal quality of the information recorded in the medium is deteriorated, in a case where the second comparison information represents a signal quality higher than that represented by the first comparison information. | 03-27-2014 |
| 20140126344 | Rotary Head Data Storage and Retrieval System and Method for Data Verification - A data storage and retrieval system includes a head carriage unit adapted for rotational motion and having multiple heads disposed at a working surface. The system also includes a tape drive unit configured to move a tape media past the working surface of the head carriage unit, the tape media having a width approximately equal to a width of the working surface. As the head carriage unit rotates and the tape moves past the working surface, a first head is configured to write a data track to the tape and a second head is configured to thereafter read the data track, where data read by the second head is for use in verifying data integrity and performing error correction. | 05-08-2014 |
| 20140293764 | OPTICAL DISC INSPECTION METHOD IN OPTICAL DISC LIBRARY APPARATUS AND OPTICAL DISC LIBRARY APPARATUS - An optical disc library apparatus, on which and plural optical discs and plural optical drives are mounted, has the ability to reduce the degradation of recording/reproduction capability owing to the variation of temperature. In the optical disc library apparatus, causes for the quality degradation of the optical discs are analyzed; temperature inside the optical disc library apparatus is measured in order to make recoveries in accordance with the causes; an inspection cycle for inspecting the optical discs is determined on the basis of the measured temperature; and the inspection of recording qualities of optical discs on which data have already been recorded and that are stored in the optical disc library apparatus is performed by the optical drives on the basis of the measured temperature. | 10-02-2014 |
| 20160055876 | OPTICAL INFORMATION REPRODUCTION DEVICE AND OPTICAL INFORMATION REPRODUCTION METHOD - An optical information recording/reproduction device is capable of appropriately correcting the angle of a reference beam during data reproduction even when a wavelength deviation or an angle deviation in multiplexing and vertical directions of the reference beam occurs in a holographic memory recording medium. The optical information reproduction device has a laser light source that generates a reference beam; an image-capturing unit that detects a diffraction ray to be reproduced from the optical information recoding medium; and an optical detection unit that has at least two light-receiving surfaces and is used for detecting a diffraction ray reproduced by irradiating the reference beam on the optical information recording medium. The device also has a light-shielding unit that shields part of the diffraction ray detected by the optical detection unit; and an error signal calculation unit that generates an error signal from a detection signal outputted by the optical detection unit. | 02-25-2016 |
| 369530360 | During storage | 6 |
| 20080205231 | Optical Disc Recording Pulse Control Method, and Control Device and Optical Disc Device Employed Therein - There are problems that recording degradation happens, and an error occurs in reproduction unless appropriate recording pulse conditions are determined. A recording pulse controlling method according to the present invention is a recording pulse controlling method for adjusting recording pulses for recording information on a writable optical disc, which includes a mark length adjustment step and a mark position adjustment step. The mark length adjustment step is a step for adjusting a recording mark length adjustment parameter, and the recording mark length adjustment parameter is adjusted to have a value for forming a recording mark having a length closest to a predetermined recording mark length. The mark position adjustment step is a step for adjusting a recording mark position adjustment parameter after the mark length adjustment step, and the recording mark position adjustment parameter is adjusted to have a value for forming a recording mark at a position closest to a predetermined recording mark position. | 08-28-2008 |
| 20080298195 | Optical recording method and optical recording device - To adjust the parameters of a write strategy for recording data on an optical recording medium, the jitter value of a reproduced signal obtained from recorded data is detected. If the jitter value exceeds a prescribed threshold, a write strategy parameter having a comparatively small effect on the jitter value is adjusted, and subsequent data are written on the recording medium using the adjusted parameter. Parameters are selected for adjustment in ascending order of their effect on the jitter value. Stable data recording can thereby be carried out without significant jitter degradation. | 12-04-2008 |
| 20090059756 | Method of Controlling Recording of Optical Disc Device and Optical Disc Device Using the Method - A method of controlling recording of an optical disc device and an optical disc device using the method. The optical disc device performs recording of data on a labeled surface of the optical disc. The device includes a buffer memory, a record unit and a controller. The buffer memory stores data and the record unit records data on the labeled surface of the optical disc from the buffer memory. The controller controls the record unit such that when a recording error occurs, the recording is stopped and when the error is corrected, data is recorded from a stopped position. | 03-05-2009 |
| 20130121124 | VERIFYING DEVICE, IMAGING DEVICE HAVING VERIFYING FUNCTION, AND VERIFYING METHOD - A verifying device includes a receiving unit operable to receive data recorded on a recording medium and a verifying unit operable to verify the received data. The verifying unit sets a predetermined first range and a second range that includes a plurality of the first ranges on the received data, performs first verification about an error on data included in the first range out of the received data, performs second verification about an error on data included in the second range out of the received data on the basis of a result of the first verification, and determines whether the recorded data is successfully recorded on the recording medium on the basis of the results of the first and second verification. | 05-16-2013 |
| 20130188465 | OPTICAL READ/WRITE APPARATUS - In an embodiment, an optical read/write apparatus performs both the operation of writing data on an optical disc and the operation of reading data written on the disc. The apparatus includes: a motor which drives the disc; a first optical pickup which irradiates the disc with a first light beam, thereby writing data on the disc; a second optical pickup which irradiates the disc with a second light beam and detects the second light beam reflected from the disc, thereby reading the data written by the first pickup on the disc; an evaluation section which obtains a distortion evaluation value of a signal waveform representing the reflected light detected by the second pickup while the disc is being driven by the motor; and a control section which controls, based on the distortion evaluation value, the power of the first light beam emitted from the first pickup. | 07-25-2013 |
| 20140003211 | OPTICAL READ/WRITE APPARATUS | 01-02-2014 |
