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| Number | Title | Issue Date |
| 8045424 | Reading method and device for optical disk drives A reading method and a reading device for an optical disk drive, which reads data on a track of an optical disk, receives a host command to read required data, checks cache data, reads cache required data to respond to the command, sets the required data to a target... | 10/25/2011 |
| 7940607 | Optical disk device In an optical pickup driving mechanism using a stepping motor, a feeding operation of an optical pickup can be stabilized even in a broad operating temperature environment. In executing an optical axis correction feeding operation in response to an amount of lens sh... | 05/10/2011 |
| 7800983 | Method and apparatus to record data to minimize a layer jump A data recording method to minimize a number of layer jumps, a recording/reproducing apparatus, and a recording medium thereof wherein a data area of the information storage medium is divided into units, each unit including one or more zones, and data is written on ... | 09/21/2010 |
| 7593293 | Optical disk drive An optical disk drive includes a pickup head, a servo circuit, and a controller. An optical disk has a first area and a second area for which different tracking methods are to be used. The controller may cause the pickup head to make a seek for a target address in t... | 09/22/2009 |
| 7545707 | Optical disc drive The present invention relates to optical disc drives including a carriage which is movable radially of an optical disc and an objective lens which is supported on the carriage movably in radial directions of the disc for formation and placement of a beam spot on the... | 06/09/2009 |
| 7369369 | Bidirectional micropositioning recording head for a magnetic storage device A recording head for use in magnetic storage devices is disclosed. The recording head includes a transducer that is bi-directionally movable with respect to a magnetic medium surface of the magnetic storage medium, thereby enabling improved positioning of the transd... | 05/06/2008 |
| 7349296 | Write control in response to tracking error A method for controlling writing on a data carrier device, at least including: writing data on the data carrier device with a data writer device; obtaining a tracking error signal corresponding to a position of the data writer device with respect to a track on the d... | 03/25/2008 |
| 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 |
| 7327640 | Recording and reproducing apparatus, recording and reproducing method, and storage medium When the user designates the reproduction of searching audio data, the designated searching audio data and audio volume data are read from a searching data recording portion. The searching audio data is reproduced corresponding to the audio volume data. When the use... | 02/05/2008 |
| 7324129 | Optical print head positioning using mechanically coupled optical pickup unit An optical print head (OPH) on the label side of an optical disc is positioned to a desired labeling position through a mechanical coupling between the OPH and an optical pickup unit (OPU) at the data side of the optical disc. The OPU is positioned to a target data ... | 01/29/2008 |
| 7319652 | Controlling optical pickup of optical disk drive by detecting change of sampling signals taken from a motor drive signal A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the sampling signal as change of the optical pickup when it is moved. Mo... | 01/15/2008 |
| 7315432 | Track-seek control method of HDD and recording medium suitable for the same A seek control method of smoothly changing to a coast mode and a deceleration mode in a track-seek control device according to a multi-sinusoidal acceleration trajectory, a recording medium suitable for the same, and an HDD adopting the same. The method includes: ca... | 01/01/2008 |
| 7292515 | Multi-layer information storage system with focus and radial positioning error detection An optical information storage system has a multi-recording-layer record carrier and a scanner device for the carrier. The scanner produces a radiation beam which is compensated for spherical aberration for a single height of the scanning spot with the stack of laye... | 11/06/2007 |
| 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 |
| 7289399 | Tracking error detection apparatus including reduction in false tracking error detection during phase error detection A tracking error detection apparatus comprises a photodetector comprising plural photoreceptor elements; zerocross detection circuits for detecting zerocross points at which two sequences of digital signals intersect the center levels of the respective digital signa... | 10/30/2007 |
| 7286061 | Method and apparatus for activating optical media A method and apparatus for activating an optical media device with a conditional access mechanism is presented. The optical media device is configured with a conditional access system such as an optical shutter assembly and the apparatus is configured to receive suc... | 10/23/2007 |
| 7283456 | Reproduction-only recording medium In a read-in area on the ROM disc, there are two control-data areas, and the Disc Information recorded in each control-data area comprises a error correction code (ECC (Error Correcting Code) block that has the same contents times, and the control-data area where re... | 10/16/2007 |
| 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 |
| 7257055 | Method and related apparatus for diagnosing crosstalk within an optical pick-up unit by utilizing firmware A method and a related apparatus for diagnosing crosstalk within an optical pick-up unit by utilizing firmware. The method includes calculating a tracking driving signal and a focusing driving signal according to a tracking error signal and a focusing error signal r... | 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 |
| 7248206 | Instantaneous multisensor angular bias autoregistration Unknown alignment biases of sensors of a tracking system are estimated by an iterative Kalman filter method. Current measurements are corrected for known alignment errors and previously estimated alignment biases. The filter time reference is updated to produce esti... | 07/24/2007 |
| 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 |
| 7242642 | High speed recording and reproducing for optical disk device of different format In an optical disk high-speed replaying/recording apparatus, a first read data quality determining section determines a quality of read second units of digital data. Upon determination that the quality of the second units of digital data is low, a first re-reading s... | 07/10/2007 |
| 7233547 | Disc-shaped recording medium, manufacturing method thereof, and disc drive device A magneto-optical disk which reproduces information with an optical pickup head which uses an electromagnetic force as the driving force is provided. Other areas than at least the recording track are magnetized uniformly in a direction of canceling the influence of ... | 06/19/2007 |
| 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 |
| 7218579 | Long seek control device for optical disk drive and method thereof A optical disk drive long distance seek control device and method thereof, capable of feeding back the optical head control device through the step motor control device during the long distance seek; wherein, the step motor control device comprises a velocity profil... | 05/15/2007 |
| 7215621 | Information disc recording/playback apparatus and method for counting pulses and controlling a rotation speed of an information disc The present invention provides an information disc recording/playback apparatus which includes a track cross detection means, a track cross direction detection means, a rotation angle detection means, and a count means, detects the track pitch of a disc, evaluates t... | 05/08/2007 |
| 7203143 | Slew rate limiting circuit and optical disc apparatus In a slew rate limiter, a slew rate is limited so as not to pass a signal varying more abruptly than a wobble signal included in a difference signal generated by a differential amplifier, and this limited slew rate is used to process the difference signal to be outp... | 04/10/2007 |
| 7193799 | Apparatus and method of removing resonance frequency in system An apparatus and a method to remove a resonance frequency of a system in which an unnecessary resonance frequency occurs in a head stack assembly (HSA) having a head for reading/writing data. The HSA is identified and filtered to prevent mechanical damage caused by ... | 03/20/2007 |
| 7187630 | Focusing servo device and focusing servo method A focal detecting means (35) of a controller (25) controls an actuator driver (38) to actuate an actuator (12) to vibrate an objective lens (3) in a direction along an optical axis. An output of a focus error signal from a signal g... | 03/06/2007 |
| 7177237 | Method of detecting orientation of optical disk drive The present invention discloses a method of detecting orientation of an optical disk drive. Firstly, a first moving distance is measured by using a first force driven on a movable optical pick up head of the optical disk drive for a preset period. Next, a second mov... | 02/13/2007 |
| 7173886 | Track jump method for dual-layered optical disk reading device A method is disclosed for jumping tracks on a double-layer optical disk from a first address A on a first data layer to a target address D on a second data layer. According to the method, the first address A where the optical head is currently positioned is read. Th... | 02/06/2007 |
| 7161884 | Information disc recording/playback apparatus and method for counting pulses and controlling a rotation speed of an information disc The present invention provides an information disc recording/playback apparatus which includes a track cross detection means, a track cross direction detection means, a rotation angle detection means, and a count means, detects the track pitch of a disc, evaluates t... | 01/09/2007 |
| 7142482 | Audio device capable of playing back audio files from a plurality of sessions An audio device is compatible with a recordable medium such as a CD-R. The audio device manages track files in each session of the recordable medium and displays the session containing the file of an arbitrary track on a display. For example, each session is regarde... | 11/28/2006 |
| 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 |
| 7110205 | Method for controlling start of adaptive spindle motor and disk drive using the method A method of controlling starting current of an adaptive spindle motor in consideration of maximum allowable consumption power and a disk drive using the method. The method includes measuring a supply voltage supplied to the disk drive, calculating a maximum current ... | 09/19/2006 |
| 7065007 | Method and a playback device for performing a track slip A method for performing a track skip and a playback device for optical storage disks enable an accelerated track skip in the case of a non-moving storage disk in which a time is determined for the track skip of a read device between a current track and a selected tr... | 06/20/2006 |
| 7062338 | Track access management for large playlists in a vehicular multimedia player An audio multimedia player has dual access modes for navigating between track selections contained in a large storage media, such as a compact disc CD-ROM having compressed audio files. The disc may includes numerous directories for organizing the audio files, but t... | 06/13/2006 |
| 7061194 | Method and apparatus for controlling constant linear velocity of spindle motor using mirror signal A method and an apparatus for precisely controlling the rotation speed of a spindle motor in an optical system according to a given condition are provided. The method involves counting in response to a clock signal widths of first and second logic states of an input... | 06/13/2006 |
| 7061852 | Recording apparatus for a holographic recording medium including an alignment laser having a different wavelength from the recording laser A recording apparatus for holographic recording medium having an alignment mark and designed to irradiate a recording light beam onto a recording region of holographic recording medium to record information as a hologram. This apparatus comprises a recording laser r... | 06/13/2006 |
