| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369470530 |
Stored and retrieved testing signal
| 92 |
| 369470520 |
During multiple system modes | 5 |
| 20080205218 | Optical disc drive and method for processing recorded data - This invention provides a technique which ensures that if a recording error occurs in an optical disc, recorded data will be immediately erased from the disc without leaking to third parties. While recording data onto the optical disc, a controller judges whether the recording process has been executed to completion properly. If the recording process is judged to have failed, the controller will stop the recording process and activate an optical pickup to erase recorded data from the data-recording area on the optical disc by overwriting this area with required erasing data. | 08-28-2008 |
| 20080291797 | RECORDING/PLAYBACK APPARATUS AND LASER DRIVE PULSE ADJUSTING METHOD - A recording/playback apparatus includes an optical head unit, a laser drive pulse generator, a power setting unit, an evaluation value calculator, and an adjustment controller. The adjustment controller performs control such that recording operations for adjusting laser drive pulses are performed on an optical recording medium by changing the adjustment setting for the laser drive pulses to different adjustment setting conditions under a condition that each of two or more levels of power of the laser light is set to obtain a quality evaluation value for each adjustment setting condition, and determines the adjustment setting for the laser drive pulses on the basis of the obtained quality evaluation value, and sets the determined adjustment setting in the laser drive pulse generator. | 11-27-2008 |
| 20080310268 | POWER CONTROL SYSTEM AND METHOD OF OPTICAL DISK DRIVE - The present invention provides a power control system and a method which are capable of generating an optimized output power of the optical disk drive under a variation of operational environment. The power control system comprises a photo detecting unit and a laser emitting unit, two sample-and-hold circuits, two amplifiers, a power control unit, and a digital-to-analog converter. The sample-and-hold circuits and the amplifiers construct a power signal circuit for generating the reading or writing power signals to drive the laser driver. The photo detecting unit detects current laser power and generates a feedback signal. The power control unit is adapted to define a power to feedback signal transfer function and a power-to-DAC transfer function according a relationship between the laser power, the feedback signal and the DAC value. The power control unit transmits a compensating signal to the digital-to-analog converter for compensating the variation of laser power under a temperature variation. The method of the present invention is adapted to define the power to feedback signal transfer function and the power-to-DAC transfer function according the relationship between the laser power, the feedback signal and the DAC value. The compensating signal can be obtained from the power to feedback signal transfer function and the power-to-DAC transfer function for adjusting the total output power of the laser diode of the optical disk drive in order to maintain the output power of the laser diode in a stable state. Therefore, the recording performance of the optical disk drive can be improved by an optimized writing power of the laser emitting unit. | 12-18-2008 |
| 20100165811 | MANAGEMENT OF DISK DRIVE DURING POWER LOSS - An embodiment of a circuit for maintaining voltage at a voltage bus after a power loss in a hard disk drive system. HDD systems may suddenly lose power and specific tasks, such as parking the read/write head and storing state data may be accomplished using a power generated from back EMF of a motor that is still turning. During the power loss sequence, a drive controller may drive a power chipset to regulate the voltage at a voltage bus so as to conserve power as much as possible. In this manner, the drive circuit may regulate the voltage via a drive algorithm to be just above a threshold voltage (typically 4.4 V) while the HDD system is storing state data, but apply other algorithm for other situations, such as parking the read/write head. Various drive algorithms may be tailored to provide a specific sequence of voltage bus regulation techniques suited to specific applications. | 07-01-2010 |
| 20150332726 | OPTICAL INFORMATION RECORDING MEDIUM AND RECORDING/REPRODUCING DEVICE - An optical information recording medium has: a recording layer; a super-resolution functional layer; and a protective layer. Letting n be the refractive index of the protective layer with respect to a laser beam focused by a focusing optical system, λ, be the wavelength of the laser beam, and d | 11-19-2015 |
| Entries |
| Document | Title | Date |
|---|
| 20080212425 | APPARATUS AND METHOD TO WRITE/REPRODUCE DATA TO/FROM OPTICAL DISC - An apparatus and method to write/reproduce data to/from an optical disc, which are capable of preventing an error from occurring at the time of examination of a writing strategy and searching for an optimum writing condition for a short period of time, by examining the writing strategy after adjusting a focus in a test region, in order to set a writing condition at the time of writing data. The apparatus to write/reproduce data to/from an optical disc includes a matrix jitter measuring unit which measures length errors and jitters of edges of a mark and a space of a written data pattern from an RF signal generated at the time of reproduction of the optical disc; and a CPU which extracts at least one of the RF signal, a jitter and an error rate, controls a focus bias, and performs an optimum power calibration (OPC) for searching for optimum power of laser. | 09-04-2008 |
| 20080232211 | Apparatus and Method For Reference Level Based Write Strategy Optimization - The invention relates to an optical recording apparatus comprising means for optimizing a write strategy in a recording process. The apparatus comprising a radiation source for emitting a radiation beam in accordance with the write strategy, a read unit so as to provide a read signal, a bit detector for providing modulation bits corresponding to the read signal, a processing unit for grouping the modulation bits into modulation bit sequences and for correlating each modulation bit sequence of the read signal to a reference level, the reference level corresponding to the average amplitude of the read signal for a given modulation bit sequence. Average transition shifts of leading and/or trailing edges are determined based on the position of the reference levels, and at least one of the one or more write parameters in the write strategy is optimized in an optimization process based on the relative values of the reference levels. Optionally, the asymmetry of an optical effect may be determined from the reference levels so that the write strategy is optimized based on the asymmetry. | 09-25-2008 |
| 20080247284 | RECORDING APPARATUS FOR OPTICAL DISK DRIVE - A recording method for an optical disk drive is implemented as follows. First, at least one of the level of the focusing error signal, the level of the tracking error signal, a wobble synchronization pattern loss, the error rate of demodulating a wobble signal, the frequency of buffer under-run occurrence, the temperature of the drive, the wobble jitter and the level of write power is detected. If at least one detected value exceeds the preset value, the recording will be ceased. Then, the rotation speed of the optical disk drive is decreased, and the recording is resumed with the decreased rotation speed. If at least one of the temperature of the drive, the wobble jitter and the estimated write power exceeds the reset value before recording starts, the rotation speed of the optical disk drive is decreased before recording. | 10-09-2008 |
| 20080273431 | INFORMATION STORAGE MEDIUM HAVING STORAGE LAYER WITH OPTICAL POWER CONTROL AREA, AND RECORDING APPARATUS TO RECORD DATA WITH RESPECT TO INFORMATION STORAGE MEDIUM - An information storage medium is provided with a plurality of information storage layers, each of which includes an optimal power control (OPC) area for obtaining an optimal recording condition. Optimal power control areas in odd-numbered and even-numbered information storage layers viewed from a direction in which light is incident upon the information storage medium are disposed one on another to not directly face each other. An actually usable area of an optimal power control area in each of the information storage layers varies depending on use circumstances of each of the information storage layers. Therefore, when an OPC area of one information storage layer performs OPC, this OPC does not affect another information storage layer. Also, an area of each of the information storage layers can be efficiently used. | 11-06-2008 |
| 20080291795 | HIGHLY ADAPTIVE RECORDING METHOD AND OPTICAL RECORDING APPARATUS - An optical disk recording method includes the steps of: providing a multi-pulse chain from a recording wave; independently changing the pulse rise timing and pulse fall timing (pulse width) of the first pulse in the multi-pulse chain in accordance with a preceding space length and a recording mark length; changing the pulse rise timing and pulse fall timing (pulse width) in accordance with a following space length and the recording mark length in a predetermined timing or in independence; and in relation to the smallest mark recorded by irradiation with mono pulse, changing the rise timing in accordance with the preceding space length and the recording mark length and the fall timing (pulse width) in accordance with the following space length and recording mark length, compensating various optical disks different in recording material without change of the fundamental waveform. | 11-27-2008 |
| 20080291796 | HIGHLY ADAPTIVE RECORDING METHOD AND OPTICAL RECORDING APPARATUS - An optical disk recording method includes the steps of: providing a multi-pulse chain from a recording wave; independently changing the pulse rise timing and pulse fall timing (pulse width) of the first pulse in the multi-pulse chain in accordance with a preceding space length and a recording mark length; changing the pulse rise timing and pulse fall timing (pulse width) in accordance with a following space length and the recording mark length in a predetermined timing or in independence; and in relation to the smallest mark recorded by irradiation with mono pulse, changing the rise timing in accordance with the preceding space length and the recording mark length and the fall timing (pulse width) in accordance with the following space length and recording mark length, compensating various optical disks different in recording material without change of the fundamental waveform. | 11-27-2008 |
| 20090175145 | FORWARD SENSE SIGNAL GENERATION - A device for recording information on a record carrier ( | 07-09-2009 |
| 20090201780 | OPTICAL DISC, OPTICAL DISC RECORDING APPARATUS, AND OPTICAL DISC RECORDING METHOD - Drive information is updated to always include the recording/playback conditions determined from the most recent learning process on a data recording medium. The data recording medium has a data recording area for recording data, and a drive information area for recording drive information. The drive information includes a plurality of drive-specific information records. Each of the plural drive-specific information records defines the operating conditions of the data recording and playback apparatus when a data recording and playback apparatus that can load and access the data recording medium reads or writes data. The plural drive-specific information records are arranged chronologically according to when the information was recorded to the data recording medium. | 08-13-2009 |
| 20090262615 | OPTICAL DISC DRIVE AND METHOD OF CONTROLLING THE SAME - An optical disc drive, which is capable of stably controlling a laser diode without having an influence on other data by recording a test pattern in at least one of a run-in area and a run-out area of a recording unit block and detecting the characteristics of the laser diode, and a method of controlling the same. The method of controlling an optical disc drive can include recording a test pattern in at least one of a header and a tail of a recording unit block including a data area having a predetermined size, detecting input/output characteristics of a laser diode via the recorded test pattern, and controlling the laser diode such that the laser diode generates a target output on the basis of the detected input/output characteristics. | 10-22-2009 |
| 20090268571 | Optical recording control method, optical recording control circuit, optical reproduction control method, optical reproduction control circuit, optical recording medium, tracking control method, tracking control circuit, optical recording method, optical recording apparatus, optical reproduction method, and optical reproduction apparatus - An object of the invention is to increase a transfer rate in data recording or data reproduction. A beam spot | 10-29-2009 |
| 20100067337 | 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. | 03-18-2010 |
| 20100309762 | OPTICAL DISC RECORDING APPARATUS AND METHOD, AND COMPUTER PROGRAM - An information recording apparatus ( | 12-09-2010 |
| 20100309763 | OPTICAL DISC RECORDING DEVICE, METHOD, AND COMPUTER PROGRAM - An information recording apparatus ( | 12-09-2010 |
| 20110007616 | OPTICAL DISC RECORDING APPARATUS, OPTICAL DISC RECORDING CIRCUIT AND OPTICAL DISC - An optical disc recording apparatus ( | 01-13-2011 |
| 20110044145 | ELECTRONIC APPARATUS WITH ADJUSTABLE POWER CONSUMPTION - The invention provides an electronic apparatus. In one embodiment, the electronic apparatus comprises an analog-to-digital converter (ADC) and an enable device. The analog-to-digital converter converts an analog input signal to a digital output signal with a resolution having a plurality of bits. The enable device dynamically adjusts the resolution of the analog-to-digital converter according to an instruction signal. | 02-24-2011 |
| 20110128836 | OPTICAL RECORDING METHOD AND OPTICAL RECORDING DEVICE - In a dye-type optical recording medium, a write strategy for use in recording is determined based on recommended write strategy parameters recorded on an optical disk ( | 06-02-2011 |
| 20110128837 | METHODS AND DEVICES FOR RECORDING MARKS IN AN INFORMATION LAYER OF AN OPTICAL RECORD CARRIER, AND RECORD CARRIERS FOR USE THEREIN - Methods and devices or writing an optical record carrier, in which a mark representing recorded data is written in a phase-change layer of a record carrier by a sequence of radiation pulses. A rear heating pulse is introduced after a last write pulse and a front heating pulse is introduced before the first write pulse. The power level of the front heating pulse and the power level of the rear heating pulse may be dependent on the length of the mark to be recorded and on properties of the record carrier. | 06-02-2011 |
| 20110158069 | RECORDING/REPRODUCING APPARATUS AND RECORDING/REPRODUCING METHOD - An optical disc apparatus capable of deriving optimum laser beam power even when OPC areas overlap with one another and a method for the apparatus. OPC result is recorded to an optical disc and OPC (area-saving OPC) that reduces an area use quantity by using the OPC result is executed and optimum laser power is determined. | 06-30-2011 |
| 20110188361 | RECORDING DEVICE AND METHOD, AND COMPUTER PROGRAM - A recording apparatus includes: a recording device for recording data onto a recording medium by applying a laser beam whose power can be adjusted; a first controlling device controlling the recording device to record calibration data while adjusting power; a first detecting device detecting calibration data recording quality; a second detecting device detecting push-pull signal amplitude by reading the calibration data; a first calculating device calculating a power by which the recording quality is desired quality, as a first optimum power; a second calculating device calculating a power by which the amplitude of the recorded push-pull signal satisfies a first condition and by which the recording quality satisfies a second condition, as a second optimum power, if the push-pull amplitude fails the first condition; and a second controlling device controlling the recording device to start recording record data by applying the laser beam with the first or second optimum power. | 08-04-2011 |
| 20110194392 | OPTICAL RECORDING MEDIUM, INFORMATION RECORDING METHOD, AND INFORMATION REPRODUCING METHOD - According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the second light reflecting layer is larger than the thickness of the first light reflecting layer. | 08-11-2011 |
| 20110222383 | WRITING METHOD FOR OPTICAL DISK DRIVE - A writing method for an optical disk drive includes receiving a command to write a disc; implementing an optimum power control (OPC) test for a predetermined data transfer rate to obtain a relation of a beta parameter to writing power; acquiring a writing power for the predetermined data transfer rate with a target beta parameter; calculating the energy area ratio of writing strategies for every data transfer rate; multiplying the energy area ratio by the writing power for the predetermined data transfer rate to produce the writing power for every data transfer rate; and compensating the writing power with automatic writing control. | 09-15-2011 |
| 20110261666 | REAL TIME POWER CONTROL FOR OPTICAL RECORDING DRIVES - The invention discloses an optical recording drive for recording data on an optical carrier such as an optical disk of the DVD or BD format. A radiation source is arranged to emit a write pulse train ( | 10-27-2011 |
| 20110317532 | Power Adjustment Method, Information Write Method And Information Write Medium - An evaluation method and print wire method which includes (a) fitting a modulation characteristic formula M,m=Msat (1−(Pws−Pasy)/(Pw,m−Pasy)) having a saturated modulation Msat, write start power Pws, and asymptotic power Pasy as parameters to a relation between a plurality of kinds of write power Pw,m and a modulation M,m which is obtained from a signal amplitude of a trial-written signal, and finding an index value of an error; and (b) evaluating whether or not the relation between the write power and the modulation is valid for write power adjustment by using the index value of the error and a predetermined value the print write method further including (c) setting the write power based upon the result of evaluating and executing a write power process with the set write power. | 12-29-2011 |
| 20120294132 | OPTICAL DISC RECORDING DEVICE AND OPTICAL DISC RECORDING METHOD - Provided is an optical disc apparatus and an optical disc recording method, in which it is decided whether or not an optical disc recording medium is one of DVD-RW and DVD+RW when data is recorded in the medium. If it is decided that the medium is one of DVD-RW and DVD+RW, maximum length information is read out from a storage portion. The maximum length information contains a previously set maximum data length of data recorded to the medium by an optical pick-up portion in one recording operation. Data to be recorded is split into split data having a data length of the maximum data length or smaller. Further, an electric power value of a base electric power for controlling the semiconductor laser element to emit a laser beam with a bottom power is reset every recording operation of the split data. | 11-22-2012 |
| 20130107686 | INFORMATION RECORDING / REPRODUCING METHOD AND APPARATUS, AND INFORMATION REPRODUCING APPARATUS | 05-02-2013 |
| 20160078893 | OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE AND OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD - An optical information recording and reproducing device performs high-speed reproduction without having to sequentially change the wavelength of a reproduction light source. The device includes: a laser light source which generates a signal light and a reference light; a temperature measurement unit which measures temperature at least at two or more positions; a wavelength adjustment unit which adjusts a wavelength of the laser light source according to a result of measurement by the temperature measurement unit; a temperature distribution calculation unit which calculates a temperature distribution on the basis of the result of measurement by the temperature measurement unit; and a control unit which controls a recording operation and a reproducing operation. The control unit controls permission and prohibition of the recording operation or the reproducing operation according to the temperature distribution calculated by the temperature distribution calculation unit. | 03-17-2016 |
