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| Number | Title | Issue Date |
| 7684286 | Track-jump control device and method thereof The invention relates to a track-jump control device, and in particular, to a track-jump control device for determining track-jump timing in an optical disc drive. A track-jump control device of a PUH comprises an L/G position indicator, a header alignment controlle... | 03/23/2010 |
| 7542381 | Method and device for track counting in optical recording media The invention relates to the identification of the direction of the relative movement between a scanning beam of an optical scanner and the tracks of optical storage media. Use is made of the fact that the amplitude of the component TW of a track error signal TE, sa... | 06/02/2009 |
| 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 |
| 7333409 | Link writing method for a recordable or rewritable compact disk and drive for using the method A link writing method for a recordable or rewritable compact disk includes recording a writing interruption address and enabling a succeeding writing process after the writing interruption. Enabling a succeeding writing process includes searching the linking area an... | 02/19/2008 |
| 7289405 | Apparatus and method for detecting optical disc type and/or adjusting track balance Provided are an apparatus and method for detecting a type of an optical disc inserted into an optical disc system and/or adjusting a track balance in the optical disc system by detecting voltages of a focus error signal and a tracking error signal. For detecting a t... | 10/30/2007 |
| 7272085 | Apparatus having switchable servo gains and offsets for optical disk drive and method thereof An apparatus having switchable servo gains and offsets for an optical disk drive adjusts its gains and offsets through the coupling of a servo signal and a switch with several changeable paths. The servo signals are either designated to undergo signal reduction with... | 09/18/2007 |
| 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 |
| 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 |
| 7193935 | Method and apparatus for controlling positioning of a pickup A disc drive to control a home-in mode and method thereof includes a pickup unit irradiating a light beam on a disc loaded in the disc drive, a motor moving the pickup unit along a radius direction of the disc, and a control unit detecting and storing position infor... | 03/20/2007 |
| 7184375 | Apparatus for scanning optical recording media using a differential phase detection method An apparatus for reading from or writing to optical recording media, having a photodetector and a phase detector for detecting a phase difference between output signals of the photodetector. An object of the present invention is to propose an apparatus in which a ph... | 02/27/2007 |
| 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 |
| 7173887 | Carriage servo method and apparatus for determining and setting a drive signal A carriage servo apparatus according to the present invention comprises: a carriage for supporting a pickup that records or reproduces information relevant to an information recording face; and a carriage motor for moving the carriage in a direction parallel to the ... | 02/06/2007 |
| 7149157 | Method and apparatus to control a step motor of an optical disk driving system An apparatus to control a step motor in an optical disk driving system to move a sled which transfers a pickup unit, including a playing unit, a coarse search unit, and a driving unit. The playing unit generates a first step pulse at a first interval of time set by ... | 12/12/2006 |
| 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 |
| 7136242 | Servo writing substantially linear servo wedges to reduce overwrite effect in perpendicular magnetic recording A disk drive is disclosed comprising a disk having a plurality of servo sectors forming a plurality of substantially linear servo wedges extending from an outer diameter of the disk to an inner diameter of the disk, wherein each servo sector is written using perpend... | 11/14/2006 |
| 7065018 | CLV system and method using PSA lookup A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to read a physical sector address (PSA) from an optical medium, calculate a table i... | 06/20/2006 |
| 7046591 | Track traverse counting on an optical disk An apparatus detects the number of tracks traversed on an optical disk. The apparatus includes a differentiation part for differentiating an output signal of a bandpass filter provided on an adjacent stage which eliminates a low DC component, a high frequency compon... | 05/16/2006 |
| 7042812 | Method and apparatus for canceling glitch noise from track cross signal A method and apparatus for canceling noise from track cross signal includes binarizing the track cross signal with reference to at least two reference values, and removing noise from the binarized track cross signal based on a command speed according to which a trac... | 05/09/2006 |
| 7020053 | Optical disc apparatus In an initial operation of an optical disc apparatus for reading out information data recorded in the innermost data recording area on the optical disc, a main processor judges whether periods between adjoining two pits are normal or not from signals outputted from ... | 03/28/2006 |
| 7020050 | Position control of opticial head in a recording device A data player or a method in which a reading and/or writing head is positioned according to anyone of 3 methods or combinations thereof: Calculating a desirable speed curve to position the head from a first to a second position and adjust the speed of the head's mov... | 03/28/2006 |
| 7012184 | Disc for use in an apparatus for signal processing and such an apparatus The invention relates to a disc for use in an apparatus for signal processing, which apparatus comprises a digital audio source and a record player with a turntable and an arm carrying a pick-up element which is arranged to play a conventional record. The disc durin... | 03/14/2006 |
| 7012864 | Optical disk recorder for writing data with variable density An optical disk recording apparatus operates on an optical disk having circular tracks which are provisionally written with an index signal used for securing a constant linear velocity of the optical disk from an innermost circular track to an outermost circular tra... | 03/14/2006 |
| 7012861 | Track jump method for a recording medium A track jump method for an optical recording/reproducing medium is provided. In the track jump method, once a track jump command is input, a track jump operation is held until a falling edge of a header mask signal is detected. The track jump starts at the falling e... | 03/14/2006 |
| 6973013 | Track jump apparatus capable of varying moving pulse and braking pulse A disk drive apparatus is disclosed for stabilizing a track jumping operation of an objective lens. The disk drive apparatus includes a detection section for detecting the direction that object lens is being moved by a tracking operation, and a discrimination sectio... | 12/06/2005 |
| 6970410 | Focus detection in a digital focus servo system A system for determining whether a focus servo system is in focus or out of focus (i.e. open) is disclosed. A sum signal can be compared with a threshold value. If the sum signal is below the threshold value, then a focus open condition (i.e., out-of-focus) can be i... | 11/29/2005 |
| 6954414 | 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... | 10/11/2005 |
| 6954408 | Signal calibration and signal generation method A radio frequency ripple zero crossing signal calibration method for an optical disk reader undergoing a track following to track seeking transition is disclosed. The method utilizes sampling to obtain radio frequency ripple peak level during a track seeking operati... | 10/11/2005 |
| 6928037 | Method for playing back recording medium A method for playing a recording medium, in particular an optical storage disc, used to access titles more quickly. Stored in a run-in area of the recording medium is at least one address area that includes at least one address of a beginning of a title stored on th... | 08/09/2005 |
| 6804176 | Apparatus and method for performing track search Apparatus for providing fine search in a sled movement mechanism employing a stepping motor by controlling the speed with which the head jumps in succession to next neighboring tracts on a disc and by causing pickup movement accurately for a distance corresponding t... | 10/12/2004 |
| 6804177 | Apparatus selecting different position signals at different scanning velocities to determine displacement of record carrier scanning In a scanning apparatus, a scanning spot is moved along a path from one track to another track of the information carrier, the scanning spot is accelerated in a first stage of the movement and decelerating in a second stage of the movement. Initially during the move... | 10/12/2004 |
| 6785197 | Control system and method for controlling the sled of the optical storage device by using stepping motor A control system and method for controlling a sled of an optical storage device by using a stepping motor. The optical storage device includes a pick-up head having a lens and a sled. The control system includes a tracking actuator's controller used to receive a tra... | 08/31/2004 |
| 6757226 | Method for reducing the turn-back of the track-seeking control in an optical storage device and apparatus thereof A method for reducing the turn-back in response to an actual and a target speed in an optical storage device. The method includes the following steps: (a) determining whether the turn-back of the optical pickup head occurs; if the turn-back occurs, step (b) is execu... | 06/29/2004 |
| 6646961 | Optical recording medium driving apparatus An optical recording medium driving apparatus which can obtain a tracking error signal necessary for an accurate track count. An optical recording medium driving apparatus for recording and/or reproducing data in/from an optical recording medium, where in... | 11/11/2003 |
| 6633520 | Method and apparatus for searching in a disk drive A center error signal is used to control the sled during fine search operations. The center error signal is used to synchronize the motion of a tracking actuator and a sled. A head is mounted on a sled in a disk drive. The sled is positioned by a sled mot... | 10/14/2003 |
| 6608809 | Seek operation on different recording density regions based on the reflection of a boundary area Information recording area of an optical disk is divided radially into a plurality of recording areas with a boundary area interposed therebetween. The boundary area is formed as either a high-reflection area that presents a higher reflection light level ... | 08/19/2003 |
| 6504801 | Optical disk system for reading and writing data in a plurality of units of sectors An optical disk apparatus for recording and reproducing data corresponding to a track length. The track length is obtained by subtracting a total length of an m (m: natural number) number of sectors from the distance by which a track is moved when a disk ... | 01/07/2003 |
| 5862106 | Optical disc reproducing apparatus and optical disc reproducing method An optical disc reproducing apparatus and an optical disc reproducing method are adapted to use, as a medium for reproduction, an optical disc on which audio signals are recorded to repeat such an operation to control a read-out system by a signal indicat... | 01/19/1999 |
| 5841739 | Accessing method and apparatus for use in hybrid optical recording device A disc apparatus comprising: an optical pick-up 5 that accesses an optical disc 4 adapted so that the area on the disc is divided into at least one reproduction only area and one recordable area, and information indicating boundary recording track positio... | 11/24/1998 |
| 5808982 | Disk calibration and search method in a CD-ROM drive system A disk calibration and search method in a disk drive is provided, in which, after an initialization step, a pickup is jumped to a first position and moved radially in a predetermined direction in response to pulses generated by a frequency generator. Duri... | 09/15/1998 |
