| Entries |
| Document | Title | Date |
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| 20080198711 | Power Calibration Method For Visible Label Recording - In summary, the present invention provides an efficient method of calibrating power for writing visible labels on an optical record medium. If the writing power is too low, the label will have a low contrast, while the image might even disappear after some time. If the writing power is too high, ablation might occur which means that the layer comes off forming blisters or flakes. The present invention solves this problem by providing a calibration method wherein a test pattern is recorded on an optical record medium with different power of the beam of light, the patterns recorded are read back and a reference power value is obtained from the patterns read back using a predetermined criterion. This reference power value obtained is used to calibrate the power needed for writing visible labels on the label side of an optical record medium. | 08-21-2008 |
| 20080198712 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING METHOD, AND OPTICAL INFORMATION RECORDING APPARATUS - An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions. | 08-21-2008 |
| 20080198713 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING METHOD, AND OPTICAL INFORMATION RECORDING APPARATUS - An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions. | 08-21-2008 |
| 20080212426 | Recording Apparatus Having a Media-and Temperature-Dependent Power Control Scheme - The present invention relates to a recording apparatus, a record carrier, and a method of controlling a radiation power used for recording data on a record carrier, wherein a write power control is performed on the basis of temperature and disc-dependent parameters to solve write performance problems, especially on dye media. To achieve this, a first control parameter indicating a variation of the radiation power due to a non-homogeneity of the record carrier is predicted as a function of a recording position, and a second control parameter indicating a temperature dependency of the radiation power is predicted based on a measured temperature. Thereby, accuracy of writing power control can be improved, especially in case of a jump between arbitrary recording positions. | 09-04-2008 |
| 20080212427 | RECORDING CONDITION ADJUSTING METHOD OF OPTICAL DISC RECORDING/PLAYING SYSTEM, OPTICAL RECORDING PLAYING DEVICE AND OPTICAL DISC - A recording condition adjusting method of an optical disc recording/playing system, including the steps of: measuring a playing signal obtained by playing a result written in an optical disc; determining whether or not an asymmetry value calculated from the result of the measuring can be employed for adjustment of recording power; calculating a predetermined statistic according to a peak local maximal value and/or a peak local minimal value of an amplitude of a playing signal according to specified codes from the result in the measuring, in the case of determining that the asymmetry value cannot be employed for adjustment of recording power; and deciding the recording power based on the predetermined statistic. | 09-04-2008 |
| 20080212428 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING METHOD, AND OPTICAL INFORMATION RECORDING APPARATUS - An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions. | 09-04-2008 |
| 20080212429 | Optical disc, method and apparatus for recording signal thereon - An optical disc includes a data area, a first test recording area, a second test recording area, and a recording information management area. The first test recording area extends inward of the data area, and has a portion which has undergone test recording. The second test recording area extends outward of the data area, and has a portion which has undergone test recording. The recording information management area includes an address information area storing an address of the portion of the first test recording area and an address of the portion of the second test recording area. The recording information management area may further include a recording condition information area storing information representing a condition of the test recording the portion of the first test recording area has undergone and information representing a condition of the test recording the portion of the second test recording area has undergone. | 09-04-2008 |
| 20080219116 | Optical Information Recording Method, Optical Information Recording Apparatus, and Optical Information Recording Medium - It is an object to be able to record data with good signal quality over a wide range of linear velocities to an optical information recording medium. To achieve the stated object, in a laser drive circuit ( | 09-11-2008 |
| 20080239898 | Calibration of Relative Laser Intensities in an Optical Storage System - In conventional one-dimensional optical storage systems, the data is arranged in a linear fashion, and the format is read out by a single spot. A two-dimensional encoded disc is different, because the data is arranged in a two-dimensional manner (bits are on a bit lattice) and the data is read out by multiple spots. It is important to know the relative intensity of the read-out spots, because the intersymbol interference is used in the signal processing of the reflected signals, and the present invention provides a way of calibrating the relative intensities by placing one or more mirror sections ( | 10-02-2008 |
| 20080239899 | OPTICAL DISK DRIVE - An optical disk drive sets optimum recording power responsive to recording linear speed. When data are recorded in an optical disk, data are managed for each recording unit block (RUB). An APC area is provided at the top of RUBs, and OPC is performed by use of the APC area, whereby optimum recording power responsive to recording linear speed is set. Tentative optimum recording power responsive to recording linear speed is set, and test data are written, for a try, in the APC area at recording power that is determined by increasing or decreasing the tentative optimum recording power by a trace amount. The optimum recording power is set in according with a β value obtained as a result of reproduction of the test data. | 10-02-2008 |
| 20080239900 | Optical disc reproducing apparatus - A DSP of a disc player includes a record signal obtaining portion for obtaining an all sum signal that is a total sum of electric signals corresponding to all reflection light obtained by an optical pickup by projecting a laser beam from an LD for BD to a reproduction data area an optical disc, which stores information to be reproduced, a test signal obtaining portion for obtaining another all sum signal by projecting the laser beam from the LD for BD to a calibration area of the optical disc where a distance from the center position is within the range of 21.3 to 22.0 millimeters, and a discriminating portion for discriminating whether or not the optical disc is a BD based on the all sum signal obtained by the record signal obtaining portion and the another all sum signal obtained by the test signal obtaining portion. | 10-02-2008 |
| 20080247285 | INFORMATION RECORDING MEDIUM, RECORDING APPARATUS, REPRODUCTION APPARATUS, RECORDING METHOD, AND REPRODUCTION METHOD - An information recording medium is provided, which comprises a plurality of recording layers and a first disc information area for storing parameters relating to access to the plurality of recording layers and formats relating to the plurality of recording layers. The first disc information area is provided in a first recording layer which is one of the plurality of recording layers. | 10-09-2008 |
| 20080259756 | OPTICAL DISK APPARATUS - A laser power which is lower than an optimum reproduction laser power is set as an initial value. The reproduction laser power is increased from the initial value while trial reproduction is performed until a quality level of a reproduction signal is not lower than a reference level. At the time the quality level of the reproduction signal is not lower than the reference level, the reproduction laser power is set as the reproduction laser power with respect to an optical disk which is of a reproduction target. | 10-23-2008 |
| 20080259757 | Method of Adjusting Writing Parameters, Optical Disc Writer and Method of Recording Data Using the Same - The present invention discloses a method of adjusting writing parameters, comprising the steps of testing a region to be written in a re-writeable optical disc without changing writing power level; calculating writing parameters in the region to be written based on the tested result; and adjusting writing parameters based on the calculated result. According to embodiments of the present invention, the direct over writing compatibility problem can be resolved. Moreover, power level adjusting is kept unchanged so as to avoid possible damage to direct over writing cycleability. | 10-23-2008 |
| 20080267027 | Method and Apparatus for Optimizing Optical Disc Writing Strategy - The present invention provides a method and apparatus for optimizing optical disc writing strategy. The method for optimizing optical disc writing strategy comprises the steps of obtaining the information concerning whether said area to be written has experienced any writing before; searching for an area that has the corresponding information in the writing optimization area on said optical disc; and performing writing test on said area that has the corresponding information to optimize and determine an optical disc writing strategy for writing said optical disc. The method and apparatus could not only reduce the difference between the optical disc writing strategy and the real optical disc writing condition as much as possible, but also lower the requirement on the optical disc writing equipment and the cost, and could be easily realized. | 10-30-2008 |
| 20080273432 | PROCESSING METHOD OF OPTICAL DISC RECORDING/PLAYBACK SIGNAL, OPTICAL DISC RECORDING/PLAYBACK DEVICE AND PROGRAM - A processing method of an optical disc recording/playback signal includes: measuring a length of a first mark of a predetermined coding length which appears immediately following a shortest space recorded on the optical disc; measuring a length of a second mark which appears immediately following a longest space recorded on the optical disc and which has the same coding length as the first mark; and calculating a heat interference amount based on a difference of the measured length of the first mark and the measured length of the second mark. The method may further include specifying a laser power at a time of forming a space or a cooling pulse width, according to the heat interference amount. | 11-06-2008 |
| 20080279065 | INFORMATION STORAGE MEDIUM HAVING MULTIPLE STORAGE LAYERS WITH OPTIMAL POWER CONTROL (OPC) AREAS AND BUFFER AREAS - An information storage medium and an apparatus for recording and/or reproducing the information storage medium are provided to control optimal recording power without an influence of an optimal power control (OPC) area in a layer upon an OPC area in a different layer. The information storage medium includes at least one information storage layer including an optimal power control area for obtaining an optical recording condition. OPC areas in adjacent information storage layers are disposed within different radiuses of the information storage medium. Accordingly, even when the information storage medium is made eccentric or has a manufacturing error, a recording property of the information storage medium is prevented from being degraded due to an influence of an OPC area in an information storage layer upon an OPC area in an adjacent information storage layer. | 11-13-2008 |
| 20080285407 | Apparatus for and Method for Recording Data on a Rewritable Optical Record Carrier - A recording device for recording data on a rewritable optical record carrier ( | 11-20-2008 |
| 20080291798 | OPTICAL DISC RECORDING METHOD AND OPTICAL DISC - A recording method for an optical disc having at least three recording layers ( | 11-27-2008 |
| 20080291799 | Laser Power Calibration in an Optical Disc Drive - Various systems, methods, and programs embodied on a computer-readable medium are provided for calibrating a laser power in an optical disc drive. In one embodiment, a range of reflectivity of an optical disc in the optical disc drive is established. A calibration pattern of marked segments is written to the optical disc and the reflectivity of the marked segments is measured. An average reflectivity is generated for each one of a plurality of laser power settings within the range of reflectivity, thereby obtaining a curve that depicts the average reflectivity with respect to the laser power settings. The laser power setting at a knee of the curve is identified and a slope of the curve at a position on the curve where the average reflectivity decreases as the laser power settings increase is determined. The laser power setting is calculated that results in a predefined darkness based upon the laser power setting at the knee and based upon the slope. | 11-27-2008 |
| 20080298189 | METHOD AND AN APPARATUS FOR RECORDING INFORMATION, AND AN INFORMATION RECORDING MEDIUM - In a method for recording information on an information recording medium having a data recording area for storing user data and a test area used for test recording by a recording apparatus, it is detected whether the test area is unusable when executing the test recording. The test recording is executed in the test area when the test area is detected not to be unusable, or executed in the data recording area when detected to be unusable. Management information relating to the test recording executed in the data recording area is recorded in a predetermined area. Hence, it is possible to eliminate a limit of number of times of test recording which depends on the size of the test recording area. | 12-04-2008 |
| 20080304380 | Recordable Optical Disc, Optical Disc Recording Apparatus, Optical Disc Reproduction Apparatus, and Method for Recording Data onto Recordable Optical Disc - An optical disk, which has a storage area is disclosed. Data is recorded and reproduced by emitting laser light into the storage area on the optical disk Power condition information and recording write strategy information which correspond to recording speed information for recording and reproducing data are recorded. The recording speed information is indicative of constant linear velocity and different linear velocity from the constant linear velocity. | 12-11-2008 |
| 20080310269 | METHOD AND SYSTEM FOR CALIBRATING AN OPTIMIZED POWER - The present invention sets forth a method and a system for calibrating optimized power of an optical pick-up unit of an optical disk drive. The system comprises a micro-processor, and a signal processor. The micro-processor coupled to the optical pick-up unit sets an initial power corresponding to an optical disk, and calculates a predetermined number of power levels to cover the range of the initial power for performing a recording procedure. The signal processor coupled to the micro-processor determines whether a servo state failed during optimized power calibration, and calculates recording performance of each power level. The signal processor transmits the servo state and the recording performance to the micro-processor for determining the optimized power. | 12-18-2008 |
| 20080310270 | Information recording method and apparatus with suppressed mark edge jitters - Recording information is disclosed in which an information recording medium is irradiated with a recording energy beam that is power-modulated into at least a record power level and a record-ready power level lower than the record power level. The information is recorded on the recording medium in the form of length and interval of a mark portion. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion. | 12-18-2008 |
| 20090016183 | Information recording medium, information recording device and method, and computer program - An information recording medium ( | 01-15-2009 |
| 20090016184 | METHOD FOR SETTING RECORDING POWER, MULTILAYER OPTICAL RECORDING MEDIUM, AND METHOD FOR RECORDING INFORMATION - A method for setting recording power of recording light, capable of an appropriate setting for a multilayer optical recording medium. The recording power of the recording light for an information recording layer of the multilayer optical recording medium to be irradiated with, is set by: evaluating an information recording layer to be evaluated for recording power when all the information recording layer(s) lying closer to a light incident surface than the information recording layer to be evaluated does is/are in a low transmittance state; evaluating the information recording layer to be evaluated for recording power when all the information recording layer(s) lying closer to the light incident surface than the information recording layer to be evaluated does is/are in a high transmittance state; and determining ground information for setting recording power, based on these values of the recording power. | 01-15-2009 |
| 20090028018 | Optical disc apparatus and recording power determining method thereof - A method of determining a recording power used to record information to an optical disc, includes carrying out test recording which records predetermined data to a predetermined area of the optical disc to determine the recording power, and recording predetermined data with a power equal to or more than the determined recording power to an area adjacent to the predetermined area. | 01-29-2009 |
| 20090059748 | METHOD, OPTICAL RECORDING APPARATUS USING SUCH METHOD AND OPTICAL RECORDING MEDIUM FOR USE BY THE METHOD AND THE APPARATUS - A method for setting an optimum value of a write power level for use in an optical recording apparatus for writing information on a recording layer ( | 03-05-2009 |
| 20090059749 | RECORDING METHOD, RECORDING APPARATUS, AND SIGNAL PROCESSING CIRCUIT FOR RECORDING INFORMATION ON OPTICAL RECORDING MEDIUM - In a recording method or apparatus, in order to set an optimal recording condition by a minimal number of times of testing, test recording is carried out while changing power and pulse width of recording pulses in a stepwise manner. Conditions for the test recording are concentrated in a region of a matrix defined by power×pulse width. | 03-05-2009 |
| 20090067304 | OPTICAL RECORDING APPARATUS AND CONTROL METHODS THEREOF - An optical recording apparatus. A laser diode driver performs optimum power calibration according to a predetermined target value to obtain reference recording power, and adjusts the reference recording power to obtain testing recording power settings. A signal process device obtains recording qualities respectively in predetermined test regions of an optical storage medium corresponding to the reference recording power and the testing recording power settings. A processor obtains an optimum recording power according to the recording quality, obtains an optimum target value corresponding to the optimum recording power. The optimum target value is then used for data recording. | 03-12-2009 |
| 20090067305 | DUAL-BEAM LASER BEAM RECORDER, AND METHOD FOR CONTROLLING A DUAL-BEAM LASER RECORDER - The present invention relates to a method for controlling a dual-beam LBR (Laser Beam Recorder) ( | 03-12-2009 |
| 20090067306 | OPTICAL DISC RECORDING METHOD, OPTICAL DISC RECORDING/PLAYBACK DEVICE, AND OPTICAL DISC - An optical disc recording method includes: determining that an optical disc to be recorded is an optical disc including a recording layer comprising organic dye; and controlling a laser such that space formation power Ps necessary for space formation is equal to or smaller than bias power Pbw. In a case wherein the relation of Ps| 03-12-2009 | |
| 20090073833 | METHOD AND APPARATUS FOR DETERMINING OPTIMUM LASER POWER - A method for determining an optimum laser power for a recording medium. The method includes checking if a portion of an unused area in a test area on the recording medium is defective, and performing an optimum laser power operation in a used area in the test area, in which the used area is a non-defective area that was used to test the optimum laser power for the recording medium. | 03-19-2009 |
| 20090073834 | METHOD OF AND APPARATUS FOR RECORDING DATA ON OPTICAL RECORDING MEDIUM - A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a mark shape such that a recording/reproducing characteristic of the optical recording medium is improved. | 03-19-2009 |
| 20090086596 | RECORDING UNIT AND METHOD OF RECORDING ON RECORDING MEDIUM - According to one embodiment, a recording unit includes a recording unit for recording data on a recording medium, a laser light source for emitting a laser when data is recorded on the recording medium, a flash memory for storing a previously measured output characteristic of the laser light source, and a control unit for controlling the recording unit, wherein the recording unit comprises a selection unit which performs test writing on the recording medium, and selects an optimum laser power from a reproducing signal waveform of the written data when data is recorded on the recording medium, and the control unit comprises a correction unit which reads an output characteristic of the laser light source from the flash memory, and corrects a value of a reference laser power when the selection unit performs test writing. | 04-02-2009 |
| 20090086597 | OPTICAL DISC APPARATUS AND OPTICAL DISC RECORDING METHOD - Provided is an optical disc apparatus including: an optical pickup configured to form marks and spaces on the optical disc by using a recording power and a erasing power respectively; a control unit configured to write test data on trial on the optical disc while changing the recording power and the erasing power and to determine an optimum recording power and an optimum erasing power; and a nonvolatile memory configured to store a correction coefficient which has been obtained in advance. The control unit corrects a power ratio of a recommended recording power to a recommended erasing power by the correction coefficient stored in the memory, and controls to write the test data on trial on the optical disc while changing the recording power and a erasing power, the erasing power being acquired from the recording power and the corrected power ratio. | 04-02-2009 |
| 20090092016 | Optical recording/reproducing write strategy method, medium, and apparatus - A write strategy method, medium, and apparatus. The method includes writing a signal to a storage medium by using a predetermined power and an initial write strategy, calculating variation characteristics of a data signal which separately correspond to variations of write strategy parameters, if the written signal does not satisfy initial quality standards, and calculating correlations among periods of the data signal and correlations among the write strategy parameters by using the variation characteristics of the data signal, and determining the write strategy parameters based on the correlations among the periods of the data signal and the correlations among the write strategy parameters. | 04-09-2009 |
| 20090097369 | Method for adjusting recording power - A method for adjusting recording power is provided. The addresses of changing recording velocity and section pause points are set. Then, the recording power in the inner circle is tested with the lowest rate, and the recording power on each high rate area is estimated. A required record data is recorded. Afterwards, whether the recording of the required record data is completed is determined. If confirmed, the recording process is terminated; otherwise, whether the recording velocity needs to be changed is determined. If confirmed, the recording is paused to change the recording velocity, otherwise, the recording process continues. The recording of required record data continues according to the estimated recording power and the recording power is tested to obtain an optimum recording power. Next, the recording power is adjusted to the optimum recording power to continue recording the rest of required record data, so as to enhance the recording quality. | 04-16-2009 |
| 20090109816 | OPTICAL DISC APPARATUS AND OPTICAL DISC PROCESSING METHOD - According to one embodiment, a calibration section controls an LD driving section so as to carry out test writing on a recording layer of an optical disc using a light pulse having relaxation oscillation, irradiates the test-written area with a reproduction laser beam so as to detect reflected light, and determine write strategy based on the detected result. A recording process is executed on the optical disc by using the light pulse having relaxation oscillation based on the write strategy determined by the calibration section. | 04-30-2009 |
| 20090116353 | Circuits, Architectures, Apparatuses, Systems, Algorithms and Methods and Software for Timing Calibration for Optical Disc Recording - 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. | 05-07-2009 |
| 20090122673 | Method for Optimizing Recording Pulse Condition in Data Recording onto Optical Information Recording Media - A specific recording pattern is sequentially written onto an optical disc using each of three sets of recording pulse conditions as trial writing. The recording patterns are reproduced sequentially. Edge shift amounts of a mark which corresponds to each of three sets of recording pulse conditions are measured from a reproduction signal. Compensation values for the recording pulse conditions are obtained from calculation by linear approximation based on the measured values. | 05-14-2009 |
| 20090122674 | Optical Disc Recording and Reproduction Device and An Optical Disc Recording and Reproduction Method - Trial writing is made by recording waveform different from that used to record information in a disc. In the trial writing, particularly, the strategy having short cooling time or large cooling power is used to make recording, so that the jitter characteristic having clear difference between jitters in magnitude can be obtained to get stable calculated power. Thus, the recording quality can be ensured and user's convenience is increased. | 05-14-2009 |
| 20090129223 | PHASE-CHANGE OPTICAL INFORMATION RECORDING MEDIUM AND METHOD FOR RECORDING AND RECORDING APPARATUS USING THE SAME - Provided by the present invention is a method for recording on a phase-change optical information recording medium including irradiating “m” number of heating pulse with power Pw and “m” number of cooling pulse with power Pc when recording a mark of n˜Tw time length, and changing a preset value of at least any one of “m”th heating pulse THm and “m”th cooling pulse TCm when “n” is voluntary during test recording and information recording when setting an optimum write power, wherein “m” is a natural number, “n” is a natural number, Tw is a channel bit length and Pw is larger than Pc, and n=2m+1 is true when “n” is an odd number and n=2m is true when “n” is an even number. | 05-21-2009 |
| 20090129224 | OPTICAL DISK DEVICE AND RECORDING METHOD - An optical disk device includes a test recording portion, a power control portion, a recording portion and a power correction portion. The power control portion determines a first recording power to record recording information to the optical disk based on test information recorded by the test recording portion. The power correction portion calculates a first average of modulation of the recording information recorded on a first track of the optical disk at the first recording power and a second average of modulation of the recording information recorded on a second track of the optical disk at the first recording power. The power correction portion increases the first recording power to a second recording power when the second average of the modulation drops below a first threshold value that is preset and drops below a second threshold value that is calculated based on the first average of modulation. | 05-21-2009 |
| 20090129225 | 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 | 05-21-2009 |
| 20090135692 | APPARATUS AND METHOD FOR DETERMINING WRITE STRATEGY, AND APPARATUS AND METHOD FOR RECORDING DATA - An apparatus and method for determining an optimal write strategy when recording data onto an optical disk, and an apparatus and method for recording data, the method of determining a write strategy including: recording test data for each size of marks and spaces based on a plurality of write strategies; reproducing the recorded test data; measuring jitter values of the reproduced test data based on the plurality of write strategies; and determining an optimal write strategy according to the measured jitter values. | 05-28-2009 |
| 20090141601 | RECORDING METHOD AND OPTICAL DISC APPARATUS - A recording power adjustment process to adjust a recording power is carried out in each recording layer of a multilayered optical disc, and a shift test writing process to adjust the pulse condition of a recording pulse is carried out only with regard to some of the respective recording layers. Then, based on the processing result of the recording power adjustment process and the processing result of the shift test writing process, a processing result of the shift test writing process in each of the recording layers, to which the shift test writing process has not been performed, is predicted. Then, information is recorded on a corresponding recording layer of the multilayered optical disc while adjusting the pulse condition of the recording pulse based on the processing result of the shift test writing process or the prediction result. | 06-04-2009 |
| 20090161510 | RECORDING METHOD OF OPTICAL DISC DRIVE - The invention is to provide a recording method of an optical disc drive, which first calibrates the write power with minimum recording speed, adjusts write powers for higher speeds, searches a blank area in a lead-out area of a disc to record with write powers for all speeds, read signals, deletes the speeds with bad recording quality, reserves the speeds with good recording quality as recordable speed, checks the required recording speed for the address of the recording data, searches the recordable speed equal to or smaller than the required recording speed, replaces the required recording speed with the searched recordable speed, records data with the searched recordable speed and corresponding write power to ensure quality. | 06-25-2009 |
| 20090168622 | OPTICAL DISK APPARATUS - According to one embodiment, an optical disk apparatus comprises an enable signal generation module configured to generate an enable signal for discriminating a mark and a space in a reproduction signal of an optical disk, a first index calculation module configured to calculate a first evaluation index for evaluating a signal quality of the mark based on a discrimination in accordance with the enable signal and a second index calculation module configured to calculate a second evaluation index for evaluating a signal quality of the space based on the discrimination in accordance with the enable signal. | 07-02-2009 |
| 20090185466 | RECORDING POWER CALIBRATING METHOD FOR IMPROVING SEEKING STABILITY ON RECORDING POWER CALIBRATION AREA - In an optimal recording power calibration method for improving seeking stability on a recording power calibration area, a specific area serves as a data recording area during an optimal recording power calibration, wherein a length of the specific area is such that a plurality of times of optimal recording power calibrations can be performed. The method includes: an optimal recording power calibration step of recording, with different recording power, a first length of calibration data in the specific area, and calibrating optimal recording power, wherein a data sector recorded in this step is defined as a calibration recording sector; and a data recording step of recording, with data recording power, a second length of information having a logical address beside the calibration recording sector of the specific area, wherein a data sector recorded in the step is defined as an information recording sector. | 07-23-2009 |
| 20090238053 | DIGITAL VIDEO RECORDER WIDE DYNAMIC RANGE OPTICAL POWER CALIBRATION - A method and apparatus are presented for optimizing write operations for optical storage media. A determination is made, at least in part by iteration, of a next power range and a current score for a current power range. If it is determined that the current score is relatively equivalent to a maximum score, a plurality of final parameters is updated and provided, including an optimal power range and a final score. If it is determined that the current score is relatively greater than the final score, then the plurality of final parameters is updated. If it is determined that a maximum number of iterations has been performed, the plurality of final parameters is provided. Otherwise, the current power range is updated with the next power range. One or more of the returned plurality of final parameters are employed to optimize write operations for optical storage media. Determination of the score may also include determining validity of test data segments, selecting a score calculation criterion, and calculating the score based at least in part on the score calculation criterion and on a number and a sequence of valid test data segments. The score calculation criterion may be based on such criterion as beta criterion or modulation amplitude. | 09-24-2009 |
| 20090245050 | OPTICAL DISK DEVICE AND POWER SUPPLY METHOD - 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. | 10-01-2009 |
| 20090245051 | METHOD AND APPARATUS FOR LASER CONTROL DURING RECORDING - 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. | 10-01-2009 |
| 20090252008 | ANALYSIS OF OPTICAL EFFECTS ON STORAGE MEDIUM - A method of analyzing the quality of optical effects on an optical recording medium as well as applications of the method in connection with optimizing a write strategy and analyzing the write quality for an optical recording medium are disclosed. The method comprising the steps of determining waveforms of a measured and a nominal optical signal, and calculating an amplitude-difference parameter from a difference in the measured and nominal waveforms. A quality measure of the optical effects can thereby be determined from the amplitude-difference parameter. The applications of the method include, but are not limited to: a device for reading optical effects from an optical storage medium with means for determining the an amplitude-difference parameter, an optical recording apparatus with means for adjusting the power level and/or level duration in a write strategy and an IC for controlling an optical storage apparatus. | 10-08-2009 |
| 20090262616 | METHOD AND APPARATUS FOR DETERMINING OPTICAL DISC RECORDING PARAMETERS - A method and apparatus for determining the parameters for disc recording is provided. For those discs that haven't pre-stored recording information or have pre-stored recording information not meeting the quality requirement, according to the method of the present invention, set the initial values of record strategy parameters firstly, then perform disc recording test with a group of parameters that have close relevancy among each other according to the method designed in the experiment, and finally determine the relationship between each optimal parameters and the optical disc recording quality, so that optimal parameters value corresponding to each parameter can be obtained for disc recording. According to the present invention, the optimal disc recording parameters can be determined within the limited time and limited space of disc recording test. | 10-22-2009 |
| 20090268572 | RECORDABLE OPTICAL STORAGE SYSTEMS - A last optimum parameter value control method is disclosed, with a laser parameter value being adjusted in a predetermined sequence at an ADIP/ATIP frame of an optical recording medium. Jitter is measured at each ADIP/ATIP frame in order to obtain an average jitter value for that particular frame, and hence parameter value. | 10-29-2009 |
| 20090268573 | OPTICAL DISC RECORDER AND VIBRATION SENSITIVE CONTROL METHOD - According to one aspect, an optical recorder for recording data onto a disc includes a shock detector. The shock detector is used for determining whether the optical recorder is vibrated based on a servo error signal and generating a control signal. The control signal is used for interrupting recording data onto the disc when the optical recorder is vibrated. | 10-29-2009 |
| 20090285066 | INFORMATION RECORDING APPARATUS AND METHOD, AND COMPUTER PROGRAM - An information recording apparatus ( | 11-19-2009 |
| 20090290461 | OPTIMIZING CALIBRATION SYSTEM - An optical scanning device scans a medium via a beam of radiation. The device has a head for providing the beam, beam control means for controlling the beam to generate a scanning spot, a front-end unit for generating a scanning signal based on radiation reflected from the medium, and an adjustment unit for adjusting the beam control means in dependence on detected errors. A beam control parameter, e.g. focus offset, is adjusted by a compromise value based on at least a first calibration value ( | 11-26-2009 |
| 20090290462 | SIGNAL PROCESSING DEVICE FOR OPTICAL DISC, INTEGRATED CIRCUIT, OPTICAL DISC DEVICE, AND OPTIMUM RECORDING FOCUS POSITION DETECTING METHOD - An optical disc signal processing device includes a focus position determining section, wherein when test recording is performed while changing a focus position through a plurality of positions, the focus position determining section obtains an optimum recording focus position based on recording qualities of regions on the optical disc where the test recording has been performed. The focus position determining section includes: a recording state measuring section for measuring, for each focus position, a recording quality of a region on the optical disc where the test recording has been performed; and a determination section for determining, according to a predetermined criterion, whether laser power during the test recording is suitable for obtaining the optimum recording focus position, based on the recording quality obtained for each focus position by the recording state measuring section. When it is determined by the determination section that the laser power during the test recording is not suitable for obtaining the optimum recording focus position, the optical disc signal processing device controls the optical pickup so that the test recording is performed again with the laser power changed. | 11-26-2009 |
| 20090303849 | OPTICAL PICKUP DEVICE AND RECORDING/REPRODUCTION DEVICE - An optical pickup device includes: a first light source for emitting recording laser light; a second light source for emitting reproducing laser light having a wavelength different from a wavelength of the recording laser light; an objective lens for converging the recording laser light and the reproducing laser light. A quarter wavelength plate is disposed between the first light source and the second light source, and the objective lens. A wavelength-selective polarized beam splitter is disposed between the quarter wavelength plate, and the first light source and the second light source. The reproducing laser light alone out of the recording laser light and the reproducing laser light reflected on recording medium is guided to a photodetector. | 12-10-2009 |
| 20090310453 | OPTICAL DRIVE AND READ POWER ESTIMATION METHOD - A method of determining a maximum allowable read power for a drive-record carrier combination is described. The method finds a forward-sense setpoint value to control a light power control loop, by reading data from the record carrier at which degradation of the data occurs. This technique is useful for all optical storage devices such as CD, DVD and Blu-ray players and recorders. | 12-17-2009 |
| 20090316544 | METHOD OF OPERATING A DATA RECORDING DEVICE - A method of operating a data recording device DRD comprising a reading/writing head OH for reading/writing data on a data record carrier OM insertable into the data recording device, the method comprises the steps of: varying at least one reading/writing head operating parameter until said operating parameter reaches a determined value, determining at least one error associated to the reading/writing head operating parameter, —regulating the reading/writing head operating parameter so as to maintain the error lower than an error threshold. | 12-24-2009 |
| 20090316545 | Multi-layered recording medium, and method and apparatus for recording data - A multi-layered recording medium, and a method and apparatus for recording data in the recording medium are disclosed. A multi-layered recording medium, each of which includes an inner area, a data area, and an outer area, includes: first layer having at least a test area assigned to the inner area; and second layer having at least a management area assigned to the inner area, wherein the test area in the first layer is not physically located at the same location as the management area assigned to the second layer adjacent to the first layer with respect to an incident beam. | 12-24-2009 |
| 20100014400 | Recording device and recording method, and computer program - A recording device ( | 01-21-2010 |
| 20100014401 | OPTICAL DISC RECORDING METHOD AND OPTICAL DISC - A recording method for an optical disc having at least three recording layers ( | 01-21-2010 |
| 20100027392 | APPARATUS AND METHOD FOR CALIBRATING OPTICAL STORAGE DEVICE - An apparatus for calibrating an optical storage device includes a clock generator, a jitter meter, and a calculation unit. The clock generator is utilized for providing a clock signal; the jitter meter is utilized for obtaining a plurality of data-to-data jitter values of a plurality of radio frequency (RF) signals according to the clock signal; and the calculation unit is utilized for determining a minimum jitter value among the plurality of data-to-data jitter values. | 02-04-2010 |
| 20100034066 | METHOD FOR ADJUSTING RECORDING POWER AND OPTICAL DISK APPARATUS - A method for adjusting recording power of an optical disk apparatus having an output circuit that outputs recording light onto a test writing area of an optical disk, and a control circuit that adjusts the recording power of the recording light outputted from the output circuit, the method including the steps of causing the control circuit to erase a recording mark recorded onto the test writing area, to record a recording mark onto the test writing area in constant recording power lower than threshold power for starting a recording operation, and to record a recording mark onto the test writing area while changing the recording power. | 02-11-2010 |
| 20100054097 | RECORDING/REPRODUCTION APPARATUS, RECORDING/REPRODUCTION METHOD, PROGRAM, AND RECORDING POWER ADJUSTMENT APPARATUS - A recording/reproduction apparatus, comprising a first recording section for recording test information onto a medium using at least one recording power, a reproduction section for reproducing at least one test signal indicating the test information from the medium, and a second recording section for recording information onto the medium using one of the at least one recording power. The reproduction section comprises a decoding section for performing maximum likelihood decoding of the at least one test signal and generating at least one binary signal indicating a result of the maximum likelihood decoding, a calculation section for calculating a reliability of the result of the maximum likelihood decoding based on the at least one test signal and the at least one binary signal, and an adjustment section for adjusting a recording power for recording the information onto the medium to the one recording power based on the reliability. | 03-04-2010 |
| 20100061206 | OPTICAL INFORMATION RECORDING METHOD - To solve the problem of deterioration in recording quality due to a change of a write waveform caused by changes of temperature and recording powers, aged deterioration and the like. A driver having a function of controlling rise/fall times and an overshoot amount of an optical waveform is used to optimize an optical waveform that changes in recording under the influence of a component of a laser and the like. Specifically, the rise/fall times and the overshoot amount of the optical waveform are optimized by obtaining a waveform control register value from test recording or a table. | 03-11-2010 |
| 20100110850 | INFORMATION RECORDING MEDIUM, INFORMATION RECORDING METHOD AND INFORMATION RECORDING APPARATUS - OPC areas are used for adjusting recording parameters (power and strategy). In an optical disc including two recording layers, the recording power for one recording layer is likely to be influenced by a transmittance variance or the like provided by the recording state of the other recording layer (either already recorded or unrecorded). In addition, recording is performed while changing the power. For these reasons, the OPC areas are located so as not to be at the same radial positions among the recording layers. However, as the number of recording layers is increased, the area size for securing the OPC areas is increased, which may undesirably lead to an increase of the lead-in zone or the lead-out zone (decrease of the user data zone) and a decrease of the OPC area size in each recording layer (decrease of the number of times of usage by the user). According to the present invention, an area for power calibration in which recording is performed while changing the power and so which is significantly influenced by the transmittance balance, is separated from an area for strategy calibration or the like in which recording is performed at a fixed power suitable to the disc and so which is unlikely to be influenced by the transmittance balance. Only power calibration areas are located at different radial positions among different recording layers so as not be influenced by the recording state of the other recording layers, and the strategy calibration areas are located so as to include the same radial position among different recording layers. | 05-06-2010 |
| 20100157759 | AUTOMATIC WRITE STRATEGY CALIBRATION METHOD FOR OPTICAL DRIVE - An optical media playback device includes a memory to store calibration data specifying how a mark of a particular length should be formed on an optical storage media. A control module writes a training pattern onto the optical storage media based on the calibration data. The training pattern includes a first mark having a first length. A control module reads the training pattern previously written onto the optical storage media and determines whether the first length of the first mark corresponds to the particular length specified by the calibration data. The control module adjusts the calibration data stored in the memory in response to the first length of the first mark not corresponding to the particular length specified by the calibration data. | 06-24-2010 |
| 20100172225 | INFORMATION RECORDING/REPRODUCING APPARATUS - An information recording/reproduction apparatus which can reduce the time required for recording power adjustment and suppress consumption of PCA is provided. The information recording/reproduction apparatus is provided with an asymmetry detection circuit which detects a recording state that varies according to a recording power, from a reproduction signal reproduced from a recording medium, a recording power setting circuit which performs recording power adjustment, a reproduction clock generation circuit which generates a reproduction clock based on the reproduction signal, a phase error detection circuit which detects a phase error between the reproduction signal and the reproduction clock, a pattern detection circuit which detects patterns of the reproduction signal, a pattern phase error averaging circuit which obtains an average of phase errors for each pattern, a recording light-emission waveform adjustment circuit which adjusts a recording light-emission waveform based on an output of the pattern phase error averaging circuit, and a recording power adjustment execution judgment circuit which controls the recording power setting circuit so as not to perform recording power adjustment when the detected recording state is within the predetermined range. | 07-08-2010 |
| 20100177609 | METHOD AND APPARATUS FOR PERFORMING BETA PREDICTION FOR HIGH-SPEED WRITING ON UNKNOWN RECORDABLE OPTICAL DISCS - A method is disclosed for performing Beta prediction for high-speed writing on unknown recordable optical discs. Test recordings are performed in the inner ( | 07-15-2010 |
| 20100238776 | METHOD OF OPTIMIZING THE WRITE POWER FOR RECORDING MARKS IN AN INFORMATION LAYER OF A RECORD CARRIER AND RECORDING DEVICE USING SUCH AN OPTIMIZING METHOD - A method of optimizing the write power for recording marks in an information layer of a record carrier by irradiating the information layer with a (pulsed) radiation beam. The method includes recording a pattern of test marks including short marks having a predetermined short nominal runlength onto the record carrier by applying at least three different write powers; measuring the runlengths of the recorded short marks obtained by applying the at least three different write powers; and determining an optimum write power based of the deviations of the measured runlengths from the nominal runlength of said short marks. | 09-23-2010 |
| 20100246350 | OPTICAL DISC DEVICE AND LASER POWER CONTROL METHOD - An optical disk apparatus according to the present invention generates a divided clock signal by dividing a recording clock signal, and based on the divided clock signal, determines a test emission pattern for test recording which is used for controlling the power of a light beam that is output from an emission section. When the linear velocity at recording changes, the division ratio is adjusted in a direction of reducing a change in frequency of the divided clock signal. In an optical disk apparatus which performs laser power control by conducting a test emission with multipulses in a test area, a good detection accuracy of a multi-pulse average value can be maintained even at high x-speeds. | 09-30-2010 |
| 20100290328 | REPRODUCING POWER ADJUSTING METHOD, OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND INFORMATION RECORDING MEDIA - By referring to a table of reproducing conditions and medium specific parameters, stored in an optical disc or optical disc apparatus and/or generated by the optical disc apparatus, the medium specific parameters to be used for performing reproducing power adjustment are changed in accordance with the reproducing condition to execute reproducing power adjustment. | 11-18-2010 |
| 20100315921 | OPTICAL RECORDING METHOD AND OPTICAL RECORDING DEVICE - In a recording method for recording information on an optical recording medium ( | 12-16-2010 |
| 20110019517 | METHOD AND APPARATUS FOR DETERMINING WRITING POWER FOR RECORDING DATA - A method and apparatus for determining an optimal writing power for recording data on a recording medium such as an optical disk, are discussed. The method according to an aspect of the present invention includes (a) performing a plurality of OPC operations on a plurality of areas of the recording medium, the plurality of OPC operations being performed in mutually different manners, the plurality of areas being areas within a power calibration area (PCA) allocated in the recording medium; and (b) determining an optimal writing power for recording data on the recording medium based on writing powers detected via the plurality of OPC operations. | 01-27-2011 |
| 20110026387 | RECORDING DEVICE AND METHOD OF ADJUSTING LASER POWER - A recording device including: an optical head section for irradiating a recording medium with laser to record and reproduce information; a laser driving section for driving the optical head section to output laser; and a control section for, in a process of adjusting recording laser power output from the optical head section, obtaining an evaluation value of a recorded area after a predetermined period of time elapsed since data was recorded as an evaluation value about a reproduction signal during reproduction of the recorded data, and adjusting recording laser power on the basis of the evaluation value after the predetermined period of time elapsed since data was recorded. | 02-03-2011 |
| 20110116351 | Servo Controller and Optical Disk Device - In a servo controller and an optical disk device (FIG. | 05-19-2011 |
| 20110116352 | RECORDING POWER DETERMINATION METHOD AND DEVICE - A recording power determination method for determining a recording power of an optical beam for recording data on an information storage medium includes the steps of recording test data on the information storage medium at a plurality of test recording powers; reading the test data recorded at each test recording power, generating a signal, and measuring a modulation factor of the signal corresponding to each test recording power; calculating a product of an n'th power of each test recording power and the corresponding modulation factor, thereby obtaining a plurality of products corresponding to the plurality of test recording powers, where n is a value of exponent and is a real number other than 1; calculating a first recording power based on the correlation between the plurality of test recording powers and the plurality of products; and calculating the recording power based on the first recording power. | 05-19-2011 |
| 20110188362 | WRITE POWER SETTING METHOD AND OPTICAL DISC DEVICE - A disc write power setting method and a disc device are provided. The write power setting method comprises reading writing characteristic information from a disc; writing test data for each of n write power values and detecting modulation with respect to the written data; calculating, for each of k power coefficients, a straight line approximating a curve composed of n points which have x coordinates corresponding to differences between a corresponding power coefficient and the write power values used for the test data writing and y coordinates corresponding to the product of modulation for the write power values and a corresponding difference and selecting a straight line having the smallest error with a corresponding curve among k straight lines and the power coefficient corresponding to the straight line; and setting optimum write power based on the selected straight line, the selected power coefficient and the read writing characteristic information. | 08-04-2011 |
| 20110188363 | Automatic Power Control System for Optical Disc Drive and Method Thereof - A method and system for calibrating an initial driving signal for driving an optical pick-up head of an optical disk drive is provided. On one embodiment, said optical disk drive is utilized for reading or writing data on an optical disk, the optical disk includes a plurality of auto power control areas (APC areas) and a plurality of data areas, and the APC areas and the data areas are interleaved in between. In at least one of the APC areas that before the data areas for a normal data writing, an initial driving signal is used for the normal data writing to drive the optical pick-up head to emit laserbeam. A detected level of the laserbeam is then obtained. An update initial driving signal is then calibrated according to the detected level and a target level. | 08-04-2011 |
| 20110194393 | RECORDABLE OPTICAL DISK, RECORDING DEVICE, RECORDING METHOD, AND REPRODUCTION DEVICE - The present invention is to realize a proper inner zone layout in an optical disk having at least three layers. A test area is provided in the inner zone (inner circumference side area) in each of recording layers. The test areas of each layer are so disposed as to be prevented from overlapping with each other in the layer direction. Furthermore, the number of management information recording/reproduction areas overlapping with the test area in the layer direction at a position closer to the laser-incident surface than this test area is set equal to or smaller than one in each test area of each recording layer. The management information recording/reproduction areas are each so disposed as to be prevented from overlapping with the test areas in the respective recording layers in the layer direction on the disk substrate side of the test areas. | 08-11-2011 |
| 20110199876 | READ AND WRITE POWER CONTROL METHODS AND SYSTEM FOR OPTICAL RECORDING DEVICE - The present invention discloses read and write power control methods and system for an optical recording device that records information on an optical disk having read-only areas. The read and write power control methods respectively introduce the steps of determining a specific level of a former power control signal output based on a former power control, and then according to the specific level, setting a predetermined level of a power control signal to induce a present power control for rapidly outputting a proper power of the pick-up head. Accordingly, the level transition of the read/write power control signal can be shortened and even eliminated. An unstable read/write power output for the pick-up head can be avoided. | 08-18-2011 |
| 20110305128 | RECORDING DEVICE, RECORDING METHOD, AND PROGRAM - A recording device includes: a recording unit that records information in a recording layer of an optical recording medium through laser beam emission performed based on a laser driving pulse; and a control unit that reads out setting information of a recording laser power and a laser driving pulse of a past that are stored in correspondence with an optical recording medium set as a recording target from a setting information storing area, allows the recording unit to perform test writing for a test writing area of the recording layer of the optical recording medium using the read out setting information of the past and to reproduce a test writing portion, and performs a setting process in which recording laser power and a laser driving pulse are set based on a result of the test writing and the reproduction. | 12-15-2011 |
| 20120002523 | OPTICAL RECORDING DEVICE AND METHOD - Before new information is recorded on a comparatively deep recording layer in a multilayer optical recording disc, a predetermined target value of a reproduced signal parameter is read from the disc itself or from a separate storage unit, the recorded/unrecorded states of the shallower recording layers are determined, and the target value is corrected on the basis of these states. The correction is based on a predetermined difference in the value of the reproduced signal parameter caused by a difference in the recorded/unrecorded states of the shallower recording layers. The corrected target value is used in calibration of the recording power by means of a test write. This correction of the target value permits reliable recording on a multilayer optical disc without delaying the start of the recording process. | 01-05-2012 |
| 20120320725 | OPTICAL RECORDING MEDIUM DRIVING APPARATUS, HIGH FREQUENCY SUPERPOSITION METHOD, AND PROGRAM - 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 evaluation signal. | 12-20-2012 |
| 20130021886 | OPTICAL DISC RECORDING DEVICE - 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 | 01-24-2013 |
| 20130128708 | TEST RECORDING METHODS FOR AN INFORMATION STORAGE MEDIUM - 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. | 05-23-2013 |
| 20150092527 | OPTICAL DISC APPARATUS AND RECORDING METHOD OF OPTICAL DISC - 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. | 04-02-2015 |
