Patent application number | Description | Published |
20090135686 | OFFSET COMPENSATION METHOD FOR LASER POWER CONTROL CIRCUIT - A method for compensating the offset of a laser power control circuit, which predetermines a fixed reference voltage, adjusts the offset voltage by adding the reference voltage, outputs a summed voltage to a pick-up head, tries to ignite the pick-up head, detects the voltage of the pick-up head, checks whether the detected voltage rises to a specific threshold voltage, continues adjusting the offset voltage if the detected voltage has not risen to the specific threshold voltage and records the offset voltage if the detected voltage has risen to the specific threshold voltage, and configures the offset voltage to be the voltage offset compensation for the laser power control circuit, thereby eliminating feature differences of different pick-up heads of the laser power control circuit. | 05-28-2009 |
20090135697 | METHOD FOR DISTINGUISHING OPTICAL DISCS - The invention is to provide a method for distinguishing optical discs, which first locks a focus on a data layer of an optical disc to cross the grooves and the lands of the optical disc, then starts testing and counting the time for testing, records a detected RF signal, checks if the time for testing reaches a predetermined time, continues locking the focus on the data layer to test if it has not, finds out the maximum intensity of the detected RF signal among the recorded RF signals, and compares the maximum intensity of the detected RF signal with the parameters regarding formats of optical discs previously stored in order to correctly distinguish the optical disc. | 05-28-2009 |
20100157767 | METHOD FOR IDENTIFYING AN ABNORMAL DISC - A method for identifying an abnormal disc includes the steps of: forming three testing spherical aberration (SA) values including an SA value of a thinner data layer, a standard SA value and an SA value of a thicker data layer; adjusting to one of the testing SA values; performing focus for a target disc and recording a focus error signal; obtaining a maximum focus error signal and a corresponding testing SA value by way of comparison; and checking whether the corresponding testing SA value is equal to the standard SA value, and identifying the target disc as a normal disc if yes, or otherwise identifying the target disc as the abnormal disc and re-adjusting the SA value to enhance the signal quality. | 06-24-2010 |
20100177606 | METHOD FOR IDENTIFING A LAYER NUMBER OF AN OPTICAL DISC - A method for identifying a layer number of an optical disc is provided. Firstly, a SA value is adjusted to a standard SA value of each of two data layers in sequence. Next, focusing courses are performed so as to enable the focus point to pass through the optical disc. Then, maximum amplitudes of focusing error signals in the focusing courses are recorded. After that, whether the maximum amplitudes of the focusing error signals recorded in the focusing courses are equal is checked. If the maximum amplitudes are equal, the optical disc is identified as a double-layered disc. If the maximum amplitudes are not equal, the optical disc is identified as a single-layered disc. | 07-15-2010 |
20110002723 | METHOD AND DEVICE FOR DISCRIMINATING LIGHT-SCRIBE DISC - A method for discriminating a light-scribe disc includes reading the media ID of the disc, comparing the read media ID with media IDs on a table by the bit searching method, discriminating the media ID with the same bit form from the table, setting the operating parameters of the media ID as the operating parameters of printing label, and waiting for a command to print the label to enhance efficiency. | 01-06-2011 |
20110122753 | METHOD FOR DETERMINING FOCUS HEIGHT - A method for determining a focus height of an optical disc drive is provided. A disc is placed into the optical disc drive. An objective lens is moved to lock a focus on a data layer of the disc. The objective lens is radially moved from inner tracks to outer tracks, and at the same time the focus voltages at the radial position are recorded. A focus voltage curve is curve-fitted based on the recorded focus voltages. A corresponding refocus voltage is obtained from the focus voltage curve according to the radial position where a focus drop occurs. The objective lens is moved to the focus height by the refocus voltage for refocusing. | 05-26-2011 |
20110292777 | METHOD FOR CALIBRATING TRACKING ERROR SIGNAL IN OPTICAL DISK DRIVE - A method is provided to start calibrating TE signals in an optical disk drive by checking the change of focus balance, outputting a first TE signal by adjust to a predetermined gain, measuring the peak and trough of the first TE signal, changing the laser power to output a second TE signal on condition of the same focus balance and predetermined, measuring the peak and trough of the second TE signal, calculating and adjusting to a calibrated gain to quickly calibrate the TE signal. | 12-01-2011 |
20120216221 | METHOD FOR CALIBRATING STEPS OF STEPPING MOTOR USED IN OPTICAL DISC DRIVE - A method for calibrating steps of a stepping motor used in an optical disc drive is provided. A pick-up head is moved to an origin of the structure. The pick-up head is moved toward a terminal of the structure by a stepping motor. The steps of the stepping motor are recorded until a counter electromotive force of the stepping motor is detected. A predetermined travel distance of the pick-up head is calculated. If the predetermined travel distance of the pick-up head is different from the maximum distance of the structure, then it is decided that the stepping motor has step error, and the steps of the stepping motor are calibrated. | 08-23-2012 |
20120263026 | METHOD FOR DETERMINING ECCENTRICITY OF OPTICAL DISC - A method for determining an eccentricity of an optical disc is provided. The method includes predetermining a plurality of optical disc with known eccentric distances, respectively measuring a ratio of maximum and minimum amplitudes of a tracking error signal of the optical discs, establishing an eccentric distance ratio table or curve, measuring a ratio of maximum and minimum amplitudes of the tracking error signal for an optical disc under test, and comparing the measured ratio with the table or curve to promptly determine the eccentricity distance of the optical disc under test. | 10-18-2012 |
20120263027 | METHOD FOR DETERMINING PHASE DIFFERENCE OF TRACKING ERROR SIGNAL - A method for determining a phase difference of a tracking error signal is provided. The method includes: predetermining a plurality of phase differences, measuring MPP and SPP signals, establishing a phase difference curve by use of an amplitude ratio between (MPP+SPP) and (MPP−SPP), measuring MPP and SPP signals for a tracking error signal under test, calculating the amplitude ratio (MPP+SPP)/(MPP−SPP), and comparing with the phase difference curve to promptly determine the phase difference. | 10-18-2012 |
20130058200 | METHOD FOR CALIBRATING TILT OF ACTUATOR BY OFFSETTING CONTROL VOLTAGE - A method for calibrating a tilt of an actuator includes the following steps: focusing a light beam projected from an objective lens onto a data layer of an optical disc; utilizing a digital signal processor to output control voltages through an analog driving circuit for driving the actuator to tilt the objective lens, and accordingly recording corresponding displacement signals of the objective lens; fitting a tilt curve through the recorded control voltages and the displacement signals; utilizing the digital signal processor to output a zero control voltage, not through the analog driving circuit, for tilting the objective lens, and accordingly measuring a standard displacement signal; acquiring a bias voltage from the tilt curve according to the standard displacement signal; and calibrating the tilt of the actuator by offsetting a control voltage outputted from the digital signal processor according to the bias voltage for controlling the analog driving circuit. | 03-07-2013 |
20140092682 | METHOD FOR PROGRAMMING AND READING FLASH MEMORY BY STORING LAST PROGRAMMING PAGE NUMBER - The invention is to provide a method for programming and reading a flash memory, storing the last programming page in a block while programming the flash memory, judging the programming times in the cell of the block by means of the last programming page and the order and distribution of the page in the predefined page distribution list of the block while reading the flash memory, and selecting the predefined voltage based on the judged programming times to implement the reading process for raising reading performance. | 04-03-2014 |
20150220274 | Reading Method of Solid State Disk - The present invention is to provide a reading method of a solid state disk, receiving read requests, pre-checking the blocked state of the request queue in non-volatile memory, registering the reading request to the reading request queue if the request queue is adjudged to be unblocked, buffering the request queue if the reading request queue is adjudged to be blocked, sending a next reading request, and checking and re-sending the buffered reading request at predetermined time length in order to improve the speed of data reading. | 08-06-2015 |
20150255147 | WRITING METHOD FOR SOLID STATE DISK - A writing method for a solid state disk is disclosed. The method comprises following steps: A writing unit is arranged in a buffer memory, wherein plane addresses of the writing unit are in one-to-one correspondence with non-volatile memories of the solid state disk. A writing data is received. A reordered plane address of the writing unit is obtained by using the residue of the logical allocation address of the writing data dividing the plane address number. Whether the reordered plane address is empty is checked. If the reordered plane address is not empty, the next plane address is shifted and the plane address is reordered. If the reordered plane address is empty, the writing data is buffered to the reordered plane address and the logical allocation address of the writing data is arranged in order. | 09-10-2015 |
Patent application number | Description | Published |
20090135695 | Method of detecting an abnormal disc - A method of detecting an abnormal disc is provided. Firstly, an objective lens is moved along a one-way path for enabling the light beam of the objective lens to pass through the data layer of a disc. Next, the path having RF signal is detected and recorded. Then, whether the terminal of the one-way path is reached is determined: if the terminal is not reached, the method continues to move the objective lens; if the terminal is reached, the method calculates the length of vibration path on which RF signal is detected. After that, whether the length of vibration path is larger than a path threshold is determined: if the length of vibration path is not larger than a path threshold, the disc is a normal disc; if the length of vibration path is larger than the path threshold, the disc is an abnormal disc. | 05-28-2009 |
20090135865 | Method for controlling power of an optical disk drive - A method for controlling laser power of an optical disk drive is provided. Firstly, a power-controlling curve of a first loop circuit is formed according to a real test. Next, two test points are selected from the power-controlling curve. Then, the voltage outputted from a second loop circuit is adjusted. After that, whether the generated internal power signal is equal to the internal power signal of the two test points is checked. Afterwards, the voltage outputted from the second loop circuit is recorded. Then, the gain of the two loop circuits under the same change of the internal power signal is calculated. Lastly, a gained power-controlling curve of the first loop circuit is used as a power-controlling curve of the second loop circuit, such that the power-controlling curve is quickly obtained. | 05-28-2009 |
20090135867 | Temperature compensation method for laser power of an optical disk drive - A temperature compensation method for laser power in an optical disk drive is provided. A predetermined linear-fitting power curve and a temperature-changing slope curve are previously stored in the optical disk drive. Firstly, an output of laser power is controlled according to the predetermined linear-fitting power curve to read/write data. Next, the temperature of the disk drive is detected. Then, whether the temperature has changed is checked. If the temperature has not changed, the method continues to read/write data. If the temperature has changed, the method obtains a relative slope from the slope curve by use of the temperature of the disk drive, displaces the slope of the predetermined linear-fitting power curve with the obtained relative slope to form a new linear-fitting power curve for replacing the predetermined linear-fitting power curve, and controls the output of laser power. | 05-28-2009 |
20090285060 | METHOD OF ADJUSTING GAIN BALANCE OF OPTICAL TRANSDUCER - A method of adjusting gain balance of an optical transducer includes the following steps. First, two external gains are predetermined. Next, the projection position of a reflection spot is adjusted toward one side of the optical transducer, and the current output values of the optical transducer each corresponding to one of the external gains are measured, respectively, Next, the projection position of the reflection spot is adjusted toward the other side of the optical transducer, and the current output values of the optical transducer each corresponding to one of the external gains are measured, respectively. Then, a gain balance value of the optical transducer is adjusted, and is set as the external gain. Next, the projection position of the reflection spot is adjusted. Finally, the projection position of the reflection spot, where the current output value of the transducer is equal to 0, is locked to complete the adjustment rapidly. | 11-19-2009 |