| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369470380 | Control of relative motion producing mechanism | 39 |
| 20090003161 | Method for Determining the Rotation Frequency of an Optical Recording Medium - The present invention relates to a method for determining the rotation frequency of an optical recording medium driven at a constant linear velocity, and to an apparatus for reading from and/or writing to optical recording media using this method. According to the invention, the method includes the steps of:
| 01-01-2009 |
| 20090080302 | DISK DRIVE AND INFORMATION PROCESSING SYSTEM HAVING THE SAME - A disk drive controls the rotational speed of a disk to an appropriate value. A system controller of the drive stores data read from a disk and read-ahead data into buffer memory. A time interval ti at which the buffer memory becomes full is measured, and the time interval ti is compared with a predetermined lower limit value t | 03-26-2009 |
| 20090092015 | Optical disc reproducing apparatus and operation method thereof - An optical disc reproducing apparatus includes: a decode processing circuit configured to generate decoded data by decoding encoded data read out from an optical disc such that the decoded data is written into a buffer memory, and to output a write signal to indicate a data rate when the decoded data is written in the buffer memory. A data processing circuit converts the decoded data read out from the buffer memory into an output data, and outputs a read signal to indicate a data rate when the decoded data is read out from the buffer memory. An optical disc rotation control circuit controls a number of rotations of the optical disc based on the write signal and the read signal. | 04-09-2009 |
| 20090168621 | DEVICES AND METHODS FOR DETERMINING A CRITICAL ROTATION SPEED OF AN OPTICAL DATA CARRIER, MONITORING A CONDITION OF AN OPTICAL DATA CARRIER, AND GENERATING A REFERENCE SIGNAL - The invention relates to a device ( | 07-02-2009 |
| 20100020656 | METHOD AND DEVICE FOR SENSITIVITY COMPENSATION - Method and device for generating a control voltage for a position actuator of a disk drive system for displacing a lens of a pick-up unit to a given X-position. The actuator is operated by an open loop control system. First, parameters of the control system are calibrated so that the control system produces a control voltage (Va) from an input position signal (Xact setp). Then, the control voltage is processed in a feed forward system for generating a processed control signal (Va_p) which is fed to the position actuator for displacing said lens to the X-position. A Z-value corresponding to the axial distance of the lens from a calibrated axial position and a temperature of the pick-up unit are measured. The position actuator operates according to the formula: Xdc=Va_p*K(Temp,Z)/(R(Temp)* C(Temp,Z)) in which: Xdc=position signal for said given position Va_p=Va processed K=property of ‘actuator’ | 01-28-2010 |
| 20100020657 | INFORMATION STORAGE MEDIUM AND METHOD AND APPARATUS FOR RECORDING AND/OR REPRODUCING POINTING INFORMATION - An information storage medium includes areas of disk-related information having disk-related information to record or reproduce data with respect to the information storage medium, wherein the disk-related information includes common disk-related information and changeable parameter information, and the areas of the disk-related information are arranged according to information about the changeable parameter information. | 01-28-2010 |
| 20100034065 | Rotation responsive disk activation and deactivation mechanisms - Embodiments of methods and systems for controlling access to information stored on memory or data storage devices are disclosed. In various embodiments, fluid-mediated modification of information or access to information is utilized. According to various embodiments, data storage devices designed for rotating access are described which include rotation-activated fluid control mechanisms. | 02-11-2010 |
| 20100232272 | WAVE PLATE, OPTICAL PICKUP AND OPTICAL DISC APPARATUS - An optical pickup includes a wave plate on an optical path to be followed by every light beam emitted from three light sources (with wavelengths λ | 09-16-2010 |
| 20100260023 | VIRTUAL SPOKE SIGNALS FOR CONTROLLING OPTICAL DISC - An optical disc is rotated at no more than 600 revolutions per minute (RPM) using a spindle motor of an optical disc device ( | 10-14-2010 |
| 20100271916 | Optical Disc Apparatus - An optical-disc apparatus comprising: a laser-light source; an objective lens; an aberration-correction lens to be moved in an optical-axis direction according to a cover-layer thickness of an optical disc; a stepping motor; a driving unit to generate a driving pulse for the motor; a storage unit to store current-position information of the aberration-correction lens based on the number of the pulse; and a control unit to control the driving unit so that the aberration-correction lens is moved between a first position set in a mechanical-movable range of the aberration-correction lens and a second position set on the objective-lens side relative to the first position, the driving unit being controlled so that the aberration-correction lens is moved to the second position when stop of disc rotation occurs, and is moved to a start position between the first-and-second positions according to the thickness based on the information when the stop is cancelled. | 10-28-2010 |
| 20100315920 | EXTERNAL OPTICAL DISC DRIVE AND METHOD OF CONTROLLING THE SAME - An external optical disc drive, connected to a bus from which a supplying voltage and a supplying current are outputted, includes: a voltage detector connected to the bus for receiving and detecting the supplying voltage; a digital signal processor connected to the voltage detector; a motor driver connected to the digital signal processor; and a spindle motor connected to the motor driver; wherein a speed-control signal, for informing the digital signal processor to lower the speed of the spindle motor via the motor driver, is outputted to the digital signal processor from the voltage detector while the supplying voltage is detected lower than a threshold voltage. | 12-16-2010 |
| 20110090775 | MOTOR DRIVING CIRCUIT - An SPM driver drives a spindle motor. A VCM driver drives a VCM. A DC/DC converter (switching regulator) receives a power supply voltage from an external circuit, and generates a stabilized voltage. Linear regulators each receive a power supply voltage from an external circuit, and each generates a stabilized voltage. A shock detection circuit detects vibration of a device mounting the driving circuit. A power monitoring circuit monitors the power supply voltage, and generates a power-on reset signal which is switched to a predetermined level whenever the power supply voltage is cut off. An ADC converts the back electromotive voltage that occurs at the VCM into a digital signal. A serial interface receives data from an external host processor, which is used to control the driving circuit. Cutoff circuits are arranged between the capacitors, which are to be charged using the induced current that occurs at the SPM, and the power supply terminal. When the power supply voltage is cut off, each cutoff circuit disconnects the corresponding capacitor from the power supply terminal. | 04-21-2011 |
| 20110134736 | Recording medium, read/write method thereof and read/write apparatus thereof - A recording medium read/write method and apparatus are disclosed. The present invention records version information of a corresponding recording medium as read/write control information within the recording medium. The version information includes write compatibility version information and read compatibility version information. The read/write apparatus efficiently performs the read/write of the recording medium with reference to the version informations recorded within the recording medium. | 06-09-2011 |
| 20110149703 | OPTICAL DISC APPARATUS AND DATA WRITING METHOD - The present invention provides an optical disc apparatus that changes the number of revolutions of an optical disc on sensing resonance. The optical disc apparatus of the present invention performs both the operation of writing data on the optical disc | 06-23-2011 |
| 20110222382 | OPTICAL DISC DRIVE AND METHOD FOR READING DATA FROM OPTICAL DISC - An optical disc drive and optical disc reading method according to the present invention is designed to perform a read operation with good stability even on a slim disc that could produce a significant axial runout. For that purpose, the optical disc drive determines, by the time it has taken for the number of revolutions of a motor that rotates the optical disc loaded to reach a predetermined number, whether the disc loaded is a lightweight disc or not (in Step | 09-15-2011 |
| 20130016595 | METHOD OF DRIVING OPTICAL DISC AND OPTICAL DISC DRIVE USING THE METHODAANM Yi; Ho-seokAACI Suwon-siAACO KRAAGP Yi; Ho-seok Suwon-si KRAANM Han; Yong-hoAACI Hwaseong-siAACO KRAAGP Han; Yong-ho Hwaseong-si KR - A method of driving an optical disc and an optical disc drive using the method is provided. The method includes rotating an optical disc by a spindle motor, transferring an optical pickup positioned to correspond to the optical disc by driving a sled motor, and decreasing a current supplied to the spindle motor while driving the sled motor. | 01-17-2013 |
| 20140362675 | EXPOSURE DEVICE, RECORDING MEDIUM, RECORDING DEVICE, AND REPRODUCING DEVICE - There is provided a recording medium including: simple tracks each configured of arranged pits or arranged marks; and grooved tracks each configured of pits or marks and grooves, the grooves being inserted between the pits or between the marks. The simple tracks and the grooved tracks are arranged alternately in a radial direction at a track pitch of 0.27 micrometers or smaller. | 12-11-2014 |
| 369470390 | During initialization or start-up | 1 |
| 20130201807 | METHOD AND DEVICE TO IMPROVE START-UP PERFORMANCE OF A MULTI-LAYER OPTICAL DISC - A method comprising recording data related to a start-up procedure on at least one of a plurality of recording layers disposed on an optical record carrier for reading back the recorded data during subsequent start-ups, the selection of the at least one recording layer based on properties of the at least one recording layer is disclosed. The technique reduces the optical record carrier start-up time and is useful for DVD, HD-DVD and BD recorders and/or players. | 08-08-2013 |
| 369470400 | Responsive to change in transduced location | 4 |
| 20100220564 | DISC-DRIVE APPARATUS AND METHOD - A disc drive ( | 09-02-2010 |
| 20110199871 | 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. | 08-18-2011 |
| 20120063282 | Systems and Methods for Improved Control of Spindle Speed During Optical Media Seek Operations - Improved control of spindle speed during optical media seek operations is provided by adjusting the spindle motor speed during the actual optical pickup unit movement. In response to receiving a seek instruction to move an optical pickup unit to a target position, the current signal frequency corresponding to a current spindle motor speed may be determined. A target signal frequency corresponding to a desired spindle motor speed at the target position may also be computed. Thereafter, the current spindle motor speed may be adjusted towards the desired spindle motor speed prior to the optical pickup unit reaching the target position. | 03-15-2012 |
| 20120224464 | SERVO CONTROLLER AND SERVO SYSTEM INCLUDING THE SAME - A servo controller in a system includes a kick/brake control unit and a compensation unit. The kick/brake control unit determines an internal parameter based on an external control signal and an operation state of a plant. The compensation unit generates a driving control signal based on an error signal supplied from the plant and the internal parameter, and supplies the driving control signal to the plant. The plant performs a steady-state operation during a first operation mode and a target moving operation during a second operation mode based on the driving control signal. | 09-06-2012 |
| 369470410 | Responsive to change in transduced information characteristic | 2 |
| 20090016182 | DISK DRIVE AND INFORMATION PROCESSING SYSTEM HAVING THE SAME - A disk drive and an information processing system optimizes the number of rotations of a disk. Data read from a disk and previously-read cache data are temporarily stored in buffer memory. When a total amount of cache data achieved during a given period of time T | 01-15-2009 |
| 20120307614 | OPTICAL DISC APPARATUS - An optical disc apparatus comprising an optical disc drive for recording on and/or playing back an optical disc; a storage part for storing information; and a save control part for accumulating and saving error information in the storage part, the error information including information that indicates specific error contents in a case in which an error has been generated in the optical disc drive. | 12-06-2012 |
| 369470420 | Responsive to stand-by or pause mode operation | 1 |
| 20080253247 | Optical disc - An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing. | 10-16-2008 |
| 369470440 | Responsive to abnormal condition | 4 |
| 20090268570 | Apparatus and method for changing speed of recording on optical recording medium during recording operation - An apparatus for changing a recording speed of an optical recording medium by analyzing wobble signals in real time during a recording operation, includes a signal process unit which outputs a cyclic redundancy check (CRC) signal that checks for a generation of errors on the optical recording medium from absolute time in pregroove (ATIP) information output from the optical recording medium during the recording operation, and a speed control unit which changes the recording speed during the recording operation according to a comparison of the CRC signal output from the signal process unit with a reference value. In the apparatus, the recording speed is limited or lowered in response to a signal quality of a recording section being less than an acceptable level during the recording operation. Accordingly, buffer under run and defects of read-in start position and seek fail, which are generated during a ZCLV operation, are prevented. In addition, the apparatus detects errors in characteristics of wobble signals from low quality media, and changes the recording speed to improve the recording quality and readability of such discs after the recording operation. | 10-29-2009 |
| 20110261665 | Optical disc with protection code, method for optaining the protection code and respective apparatus for reading of data - The optical disc comprises a substrate layer, a read-only data layer having a pit/land data structure including user data and control data arranged in tracks on the substrate layer, and a nonlinear layer with a super-resolution structure disposed on the data layer, wherein the control data are correctly readable only by including a reverse rotation of the disc. The control data include in particular a protection code for the disc, for example a copy protection code, so that the user data of the disc are only readable after reading of the control data. | 10-27-2011 |
| 20120294131 | REPRODUCING METHOD AND REPRODUCING APPARATUS - A reproducing method includes: irradiating a laser spot for servo to which astigmatism making up a generally 45-degree angle in the tangential direction of an information recording track has been applied, and one or more laser spots for reproduction, onto a recording medium where a track group is formed with multiple information recording tracks adjacent with a narrower track pitch than a track pitch equivalent to optical cut-off, and also where a track group pitch is wider than the track pitch equivalent to optical cut-off; and subjecting one or more laser spots for reproduction to on-track control as to one of the information recording tracks by taking a tangential push pull signal obtained from reflected light information of the laser spot for servo as a tracking error signal, and performing tracking servo control using this tracking error signal, and reproducing data from the reflected light information thereof. | 11-22-2012 |
| 20130107685 | OPTICAL DISC DEVICE | 05-02-2013 |
| 369470460 | By information signal characteristic | 3 |
| 20090310452 | OPTICAL DISC SIGNAL PROCESSING APPARATUS AND OPTICAL DISC REPRODUCTION APPARATUS - An optical disc signal processing apparatus is provided which comprises a rotation control section for measuring and outputting the number of edges within a predetermined time for a binary signal obtained from an RF signal reproduced from an optical disc on which information is recorded, a detecting section for detecting a missing portion of the RF signal, and a parameter control section for, when a missing portion of the RF signal is not detected, calculating and outputting a rotation control parameter for controlling a rotation of the optical disc based on the number of edges obtained by the rotation control section, and when a missing portion of the RF signal is detected, controlling the rotation control parameter so that an influence of the missing portion of the RF signal is suppressed. | 12-17-2009 |
| 20100188945 | METHOD AND APPARATUS FOR DATA DETECTION - In data detection | 07-29-2010 |
| 20120147722 | Nanometer Scale Instrument for Biochemically, Chemically, or Catalytically Interacting with a Sample Material - A data storage system that includes a positioning system for positioning the write/read mechanism and the storage medium of the data storage device with respect to each other in first and second predefined directions. In several embodiments, the read/write mechanism is used to mechanically write data to and electrically read data from the storage medium. In still another embodiment, the read/write mechanism is used to optically write data to and electrically read data from the storage medium. In yet another embodiment, the read/write mechanism is acoustically aided in electrically writing data to and reading data from the storage medium. | 06-14-2012 |
| 369470470 | By program or address signal | 1 |
| 20130215727 | RECORD CARRIER OF THE OPTICAL TYPE AND A DEVICE FOR RECORDING AND/OR PLAYBACK FOR USE WITH SUCH A RECORD CARRIER - The invention relates to a record carrier of a disc-like optically inscribable type, having a preformed track in which an auxiliarily signal comprising a sequence of codes is recorded by means of a preformed track modulation. The codes comprise a sequence of address codes (AC) specifying the addresses of the track portions in which said address codes (AC) are recorded and special codes (SC). The special codes (SC) can be distinguished from said address codes (AC) and specify control data for controlling a recording by a recording device. The sequence can be obtained by replacing in a sequence of address codes (AC) with consecutive address values a plurality of said address by special codes (SC). The periodic pattern of address codes and special codes has a predetermined positional relationship with respect to a predetermined reference address. Such as for example a positional shift with respect to the start of a Lead-in area. The presence and or amount of such a shift may be used to represent additional control information or indicate the presence of area on a disc provided with such additional control information. | 08-22-2013 |
| 369470480 | By synchronous signal | 6 |
| 20080239896 | GENERATION METHOD OF CLOCK SIGNAL OF PATTERNED MEDIUM, PATTERNED MEDIUM AND STORAGE DEVICE - A clock generation method detects from servo signals a degree of decentering of a patterned medium having recording pits arranged in a circular pattern and changes a clock frequency for recording/reproduction based on the detected degree of decentering. | 10-02-2008 |
| 20090116352 | CLOCK GENERATING APPARATUS, MAGNETIC DISK APPARATUS, AND WRITE SYNCHRONIZATION METHOD - A recording apparatus detects a preamble, which is a series of patterns formed on a track, and generates a clock based on the preamble. The recording apparatus then detects a Sync mark, which is a predetermined pattern formed between the preamble and a Resync mark, calculates a predicted position of the next Resync, and switches PLL gain to a low level. The recording apparatus then detects the Resync mark, which is a pattern of equal to or more than one pulse, and corrects the generated clock. Specifically, upon detecting the Resync mark, the recording apparatus compares a timing of the predicted position of the Resync, and the timing at which the Resync mark is actually detected to correct a write clock. | 05-07-2009 |
| 20100091624 | Information reproducing device - An A/D converter samples a read signal in synchrony with a system clock sclk having a fixed frequency, to perform an A/D conversion. A fluctuation compensator is configured as an internal-feedback-type compensation filter, and suppresses fluctuation of a digital signal output from the A/D converter. A digital PLL uses an interpolator to generate, by interpolation, a sampled value of the read signal at a timing in synchrony with a channel frequency, and uses NCO to generate a synchronizing clock and an interpolated-phase signal that is fed back to the interpolator. A binarization circuit binarizes the read signal based on the interpolated value output from the interpolator. The frequency characteristic of the fluctuation compensator is controlled based on the frequency value output from the loop filter. | 04-15-2010 |
| 20100110848 | PLL CIRCUIT AND DISK DRIVE - A digital loop filter receives a phase error output from a phase comparator to generate a digital frequency value. This digital frequency value is converted into an analog voltage by a D/A converter, and VCO outputs a synchronizing clock of frequency corresponding to the voltage output from the D/A converter. The phase error output from a phase comparator is gain-corrected by a product of an output from the digital loop filter and a specific coefficient “A”, and delivered to digital loop filter. The phase error input to the digital loop filter is changed in proportion to the output clock frequency, whereby the PLL loop as whole linearly controls the loop characteristic depending on the output clock frequency. | 05-06-2010 |
| 20110007615 | Oscillation circuit and recording apparatus - An oscillation circuit includes: n ring oscillators each formed from m delay elements connected annularly, m being an integer equal to or greater than 2, n being an integer equal to or greater than 2; and a phase coupled ring. | 01-13-2011 |
| 20130003514 | METHOD AND APPARATUS FOR DATA STORAGE - A method and an apparatus for data storage based on fibers are described. Data are stored as marks in a surface of a fiber or in a volume near the surface of the fiber. Data marks are written to or read from the fiber by irradiating the surface of the fiber with at least one radiation beam. The fiber has calibration marks for controlling a speed of the fiber relative to the at least one radiation beam. | 01-03-2013 |
