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| Number | Title | Issue Date |
| 7924661 | Track-jump control system and method for maintaining track-jump stability A track-jump control system and method are provided. The track-jump control system applied in an optical disc drive comprises a signal generator, a protection device, a velocity estimator, and a controller. The signal generator receives the signal from the PUH and g... | 04/12/2011 |
| RE42067 | Method for controlling optical pickup head upon switching from following mode to seeking mode A method for controlling an optical pickup head of an optical processing apparatus is provided. A first lead-lag compensator is disabled and a second lead-lag compensator is enabled when the optical pickup head switches from a following mode to a seeking mode. Then,... | 01/25/2011 |
| RE41528 | Adaptive brake force setting system in an optical recording device The invention provides an adaptive brake force setting system. Every time when a pickup head with a predetermined mass crosses a plurality of recording tracks in an optical recording media, the system is used for selling brake force to make the pickup head stop from... | 08/17/2010 |
| 7733745 | Method for controlling the rotation of optical disc using speed profile and holding circuit A motor control method for rotating an optical disc to be accessed by an optical head includes steps of: providing an increasing power to rotate a motor at increasing speed when a seeking operation of the optical head is performed; and interrupting the increasing po... | 06/08/2010 |
| 7573786 | Optical disk apparatus and rotation speed control method thereof An optical disk apparatus is disclosed which can suppress excessive reduction of recording speed on the inner side of a disk and that can assure quick response of accessing operation. When, at the time of access, a write or read operation is performed while returnin... | 08/11/2009 |
| 7522480 | Digital tracking servo system with multi-track seek with an acceleration clamp A servo system with a multi-track seek algorithm with an acceleration clamp is presented. The multi-track seek algorithm detects zero crossings in a tracking error signal, counts the number of zero crossings to form a count, and calculates a reference velocity from ... | 04/21/2009 |
| 7420348 | Drive apparatus Optical disc drives designed for reduced power consumption switch the supply voltage in three stages between first, second, and third power supplies. The reduction in power consumption that is possible in the focusing and tracking drive circuits with three stage swi... | 09/02/2008 |
| 7355939 | System and method for switching control modes of spindle motor A system and method of switching the control modes of spindle motor are described. The switch system comprises a first control module, a second control module and a switch controller. The first control module electrically coupled to the spindle motor and the OPU con... | 04/08/2008 |
| 7352667 | Optical disc drive with a system behavior detection module An optical disc drive includes a servo system and a system behavior detection module. The system behavior detection module includes a controller and a signal feeding unit coupled to the controller and the servo system. The controller is operable in a detection mode ... | 04/01/2008 |
| 7345966 | Method and apparatus for achieving a short seek with a stepping motor A method for controlling a stepping motor in an optical storage system and for achieving a short seek with the stepping motor is disclosed. The optical storage system comprises a pick-up head and object lens, wherein the object lens is movably installed on the pick-... | 03/18/2008 |
| 7343291 | Multi-pass variable bitrate media encoding An encoder uses multi-pass VBR control strategies to provide constant or relatively constant quality for VBR output while guaranteeing (within tolerance) either compressed file size or, equivalently, overall average bitrate. The control strategies include various te... | 03/11/2008 |
| 7336571 | Method and arrangement for compensating scanning disturbances on optical recording media The invention relates to a method and an arrangement for compensating scanning disturbances on optical recording media such as occur in a control loop of a playback or recording unit, in particular as settling amplitude after a disk disturbance and are caused by scr... | 02/26/2008 |
| 7336568 | Method and apparatus for long seeking control in an optical disc drive A method for controlling long seeking operation in an optical disc drive is provided. The optical disc drive includes a sled actuator, a pickup head installed on the sled actuator for reading and/or writing data in an optical disc, and a controller for controlling t... | 02/26/2008 |
| 7319646 | Focus operation for an optical disk device A disk device in which at the recovery job of a focus pull-in operation, a CPU supplies servo control means with the respective correction values of the rotational speed of an optical disk and the moving speed of a lens which are described in the data table of a RAM... | 01/15/2008 |
| 7315494 | Optical disk device and method for controlling slider An optical disk device includes a head including an actuator that supports and moves an objective lens at least in a direction of focusing, and a slider for transporting the head in the direction of tracking. In response to a static acceleration acting on the object... | 01/01/2008 |
| 7313063 | Method of determining the time for executing optimal power calibration in an optical drive A method of determining the time for executing optimal power calibration in an optical drive. First, relationships between values of a driving signal and ambient temperatures of the optical drive are recorded in look up table in a memory. According to the look up ta... | 12/25/2007 |
| 7295397 | Feedforward controller and methods for use therewith A controller includes a combining module that generates a total control signal for the drive device of a disk drive by combining a feedback control signal and a feedforward control signal. A feedback control module generates the feedback control signal in response t... | 11/13/2007 |
| 7289411 | Optical disc apparatus The present invention provides an optical disc apparatus capable of rotating an optical disc with high speed while enabling reduced current consumption. The optical disc apparatus comprises a spindle motor for rotating the optical disc and a thread motor for driving... | 10/30/2007 |
| 7289397 | Method and apparatus for determining position of optical pick-up head A method for determining the position of a pick-up head involves retrieving the respective parameter values relating to the linear velocity and angular velocity of the pick-up head at a certain place on the optical disk, and then calculating the ratio of the paramet... | 10/30/2007 |
| 7286319 | Disk drive write control by servo gain A method of controlling a disk drive is disclosed that is capable of precise and real-time detection of an abnormal floating height of a magnetic head over an entire area of a magnetic disk. The method of controlling the disk drive includes the steps of: calculating... | 10/23/2007 |
| 7280741 | Method and apparatus for controlling the insertion of stuffing data into a bitstream to be recorded In DVD Stream Recording Stream Object Units are real-time recorded, wherein such fixed-length Stream Object Units serve as a container for Application Packets that have a variable length and carry payload data and an Application Time Stamp, this timestamp enabling p... | 10/09/2007 |
| 7280447 | Method and apparatus for slip protection of DVD-RAM drive's seek control The present invention is provides a method and apparatus for slip protection of DVD-RAM drive's seek control, comprising a slip end velocity controller, a re-seek controller, and a slip detector. Among them, the slip end velocity controller is used for providing a f... | 10/09/2007 |
| 7277278 | Hinged panel and disc drive for a computer A panel hingedly connected to the body of a computer that includes an optical disc drive in electrical communication with the computer is provided. ... | 10/02/2007 |
| 7260031 | Digital focus and tracking servo system with one-track jump A tracking and servo system with a one-track jump is disclosed. The one track jump algorithm holds a control signal from the tracking servo system. The one track jump algorithm adds an acceleration control signal to the held control signal for a first period of time... | 08/21/2007 |
| 7257069 | Optical storage device and optical device An optical storage device having a lens opposite to a storage medium comprises an actuator that moves the lens,a mechanical shock acceleration sensing means that senses a mechanical shock acceleration, a collision prevention control means that drives the actuator fo... | 08/14/2007 |
| 7251201 | Method of searching new writable address for optical recordable medium A method of searching a new writable address (NWA) for an optical recordable medium includes providing an optical pickup head and setting a first search starting point thereof; determining if NWA is located at the latest track and setting a search finishing point of... | 07/31/2007 |
| 7248541 | Optical disk device and access method for optical disk device An optical disk device has a recording information management portion which detects a distribution of a recorded region R and an unrecorded region M based on reflection light received by an optical head and an access target setting circuit which determines an access... | 07/24/2007 |
| 7230886 | Speed error compensation method for optical storage device The present invention discloses a system for speed error compensation. A predetermined speed signal subtracts a feedback speed signal to generate a speed error signal, and a microprocessor receives the speed error signal and outputs a calculated result. A feedback c... | 06/12/2007 |
| 7206264 | Method for regulating the tracking of a scanning device and drive for the same A method is provided for regulating the tracking of a scanning device, for example, a read/write head, of a drive. A drive for storage media having a scanning device is also provided, permitting improved regulation of the positioning of the scanning device. A measur... | 04/17/2007 |
| 7196977 | Track jump control circuit for accessing optical disk drive In track jumping operation, an acceleration/deceleration pulse generation portion measures the TE signal amplitude during track jumping, and modifies the acceleration/deceleration time of the acceleration/deceleration pulse according to the measured amplitude to dri... | 03/27/2007 |
| 7177238 | Method and related apparatus for adapting rotation speed adjustments of a motor via a pause mode while accessing data from an optical disc A method and related apparatus for data accessing of an optical disk drive. The optical disk drive has a motor for rotating an optical disk and a pickup head. The pickup head is capable of writing data onto the optical disk according to a write-in clock. The method ... | 02/13/2007 |
| 7167421 | Method for controlling optical pickup head upon switching from following mode to seeking mode A method for controlling an optical pickup head of an optical processing apparatus is provided. A first lead-lag compensator is disabled and a second lead-lag compensator is enabled when the optical pickup head switches from a following mode to a seeking mode. Then,... | 01/23/2007 |
| 7161880 | Disk apparatus for projecting a laser beam onto a recording surface of a disk recording medium A disk apparatus (10) includes an optical lens (14). A seek operation is performed by moving the optical lens in a radius direction of a recording surface of a magnetooptical disk (40). When the seek operation is being operated, a TE signal dete... | 01/09/2007 |
| 7136329 | Method and apparatus for canceling glitch noise from track crossing signal Provided are a method and apparatus for canceling noise from a track cross signal, a method for controlling an optical disc drive, an optical disc drive, and an optical disc reproducing apparatus. The method for removing noise from a track cross signal includes (a) ... | 11/14/2006 |
| 7133881 | Encoding and transferring media content onto removable storage A media content is encoded at multiple bit rates to form a multi-bit-rate encoded media content, wherein the media content contains at least one segment. The multi-bit-rate encoded media content is stored to a first data storage device. An amount of disk space avail... | 11/07/2006 |
| 7122990 | Digital servo motor controller IC design for preventing the power feedback effect during manual adjusting the servo motor The present invention provides an improvement design for a digital servo motor controller IC to prevent the power feedback effect during manual adjusting the servo motor. A circuit is added at each output of the digital servo motor controller IC. The added circuit c... | 10/17/2006 |
| 7116607 | Apparatus and method of removing disturbances during optical recording and/or reproducing An apparatus to remove periodic disturbances in a recording medium having large eccentricity and deflection mass includes an actuator to change a position of a pickup in response to a combination of first and second compensation signals, an error detector to detect ... | 10/03/2006 |
| 7106670 | Method and apparatus for long seeking control of pickup head A method for long seeking control of an optical read/write head is disclosed. The optical read/write head includes a sled moved by a sled motor, and a lens mounted on the sled and moved by a lens actuator, and said method includes steps of determining a velocity pro... | 09/12/2006 |
| 7106668 | Disk drive apparatus A disk drive apparatus for a disk having helically-formed or concentric circle-like formed tracks includes a spindle motor for controlling a rotation of the disk; a pick-up device for recording or reproducing information on or from the disk; a stepping motor for mov... | 09/12/2006 |
| 7092332 | Optical disk and information reproducing apparatus An optical disk for a sampled servo system is provided with a servo area having a synchronization pit serving as a synchronization reference of reproduction; and a data area having a plurality of data pits which records the digital data and a tracking pit which serv... | 08/15/2006 |
