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| Number | Title | Issue Date |
| 8144552 | TE signal polarity determining system and related method thereof A tracking error (TE) signal polarity determining method, comprising: (a) obtaining a wobble related signal and a TE signal from an optical pick-up unit accessing an optical disc; (b) determining an accessing direction; and (c) determining if an original polarity of... | 03/27/2012 |
| 8107329 | Optical storage system having differential phase detector A differential phase detector for an optical storage system is set forth. The differential phase detector includes a photodetector circuit arranged to detect light deviations associated with radial errors in the optical storage system. A non-linear equalizer is in c... | 01/31/2012 |
| RE43018 | Optical disk apparatus and tracking method A tracking offset is reduced. The effect of an SPP signal fluctuation is reduced by using a variable mixing ratio DPP method, and a residual tracking offset is minimized. ... | 12/13/2011 |
| 8072851 | Position control apparatus and optical apparatus A position control apparatus (optical apparatus) is disclosed which is capable of preventing disadvantages caused by the absence of a dead band while achieving a required accuracy of positional control. The position control apparatus comprises a controller which con... | 12/06/2011 |
| 8072852 | Optical disc device An optical disc drive according to the present invention can write data on both a write-once disc and a rewritable disc. The drive includes: a disc recognizing section 110 for recognizing the type of a given optical disc as a write-once disc or a rewritable d... | 12/06/2011 |
| 8059502 | Data storage system and method for operating a servo system Disclosed herein are aspects of optical tape technology, tape manufacturing, and tape usage. Methods and systems of tape technology disclose optical tape media including: configurations, formulations, markings, and structure; optical tape manufacturing methods, syst... | 11/15/2011 |
| 8054715 | Track counting system and method for recordable optical media A tracking system for an optical drive includes a focus error module. The focus error module generates a focus error signal based on a difference between a first sensor output signal and a second sensor output signal, which are based on a reflected portion of a lase... | 11/08/2011 |
| 8027228 | Optical disk device and seek method in optical disk device An optical disk device executes a seek operation to move an irradiation position of light beam on an optical disk to a track of a target address. During execution of a seek operation through a one-track jump operation in which the irradiation position of the light b... | 09/27/2011 |
| 8014240 | Optical disk device, method of controlling optical head, and control device for optical head An optical disk device includes a DPDTE signal generating section that detects misalignment between a light spot and a mark or a pit, an FE signal generating section, an optical crosstalk correcting section which corrects a signal output by the FE signal generating ... | 09/06/2011 |
| 7995428 | Optical disc apparatus and seek processing method An optical disc apparatus of the present invention includes an optical head (103) including a lens disposed at a position shifted from a traverse axis in a tangential direction, a traverse motor (104) as a second moving unit that moves the optical head... | 08/09/2011 |
| 7990816 | Optical disk apparatus A conventional optical disk apparatus detects the amount of shift of an objective lens with a tracking error signal and an RF signal, and controls, when an optical pickup is moved, the shift amount for performing high-speed seek and high-speed access. The problem he... | 08/02/2011 |
| 7990817 | Optical disk medium and tracking method A super-resolution material is formed in only a data pit, in a low temperature state of the super-resolution material, reflectivity of each of a pit portion and a space portion and an optical phase difference therebetween are set to be sufficiently small, in a high ... | 08/02/2011 |
| 7983119 | Optical disc apparatus An optical disc apparatus reliably executes a seek operation even if an optical disc is warped. Tilt adjustment values spanning from the inner circumference to the outer circumference of an optical disc are stored. When seeking from a start address to a destination ... | 07/19/2011 |
| 7969832 | Optical tape drive systems Disclosed herein are aspects of optical tape technology, tape manufacturing, and tape usage. Methods and systems of tape technology disclose optical tape media including: configurations, formulations, markings, and structure; optical tape manufacturing methods, syst... | 06/28/2011 |
| 7944784 | Land/groove track and pickup head movement direction detection A detector is scanned across an optical storage medium having groove tracks and land tracks, each track having a wobble structure, to detect light reflected from the optical storage medium. A wobble signal and a tracking error signal are generated based on an output... | 05/17/2011 |
| 7907480 | Optical disk apparatus with an improved track jump performance An optical disk device for recording or reproducing an optical disk has: an objective lens for irradiating a laser beam to the optical disk; an actuator for moving the objective lens in the radial direction of the optical disk; and a spindle motor for rotating the o... | 03/15/2011 |
| 7885150 | Track jumping scan control device and track searching device In a track jumping scan control device wherein an optical beam is irradiated on an optical disc provided with a header region capable of a mark-recording operation with respect to both of land and groove tracks adjacent in a radial direction of the disc and comprisi... | 02/08/2011 |
| 7843776 | Optical disk recording/reproducing apparatus and seek control method thereof For achieving pulling operation into tracking servo during seek operation at high-speed and with stability, in timing thereof, even on an optical disk forming lands and grooves on a recording surface thereof, in a seek control method, according to the present invent... | 11/30/2010 |
| 7830756 | Demodulation of tracking error signal to obtain lens position for lens motion control in an optical disc system A method for demodulating a tracking error signal comprising the steps of (A) demodulating the tracking error signal when starting motion, (B) demodulating the tracking error signal after motion has started, and (C) demodulating the tracking error signal before and ... | 11/09/2010 |
| 7826315 | Optical disc drive and focus position control method According to one embodiment, a focus position control method includes irradiating a beam to an optical disc via an objective lens, receiving reflected light and outputting a signal, generating a focus error signal, detecting an amplitude of a signal high-pass-filter... | 11/02/2010 |
| 7817507 | Optical disk device performing high-speed seek operation and optical disk device seeking method When a remaining number of tracks is smaller than a first threshold value, a coarse seek operation is determined to be normal, and therefore, a learning process is not executed. If the remaining number of tracks is not smaller than a second threshold value, the coar... | 10/19/2010 |
| RE41687 | 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. During this rad... | 09/14/2010 |
| 7760592 | Optical disk apparatus with an improved track jump performance An optical disk device for recording or reproducing an optical disk has: an objective lens for irradiating a laser beam to the optical disk; an actuator for moving the objective lens in the radial direction of the optical disk; and a spindle motor for rotating the o... | 07/20/2010 |
| 7746734 | Optical disk apparatus and tracking method A tracking offset is reduced. The effect of an SPP signal fluctuation is reduced by using a variable mixing ratio DPP method, and a residual tracking offset is minimized. ... | 06/29/2010 |
| 7688690 | Method of activating a data phase locked loop during track-seeking and apparatus of operating the same A method of determining whether an optical pick-up of an optical device passes through a data track of a storage device during track-seeking based on a radio frequency (RF) signal, a radio frequency zero cross (RFZC) signal radio and a track-seeking signal of the op... | 03/30/2010 |
| RE41177 | Track count method for an optical disc in an optical disc system A method for counting a number of tracks of an optical disc in an optical disc system. The optical disc system includes an optical pickup, a light source, and a plurality of optical sensors. The method includes emitting a light beam to the optical disc from the ligh... | 03/30/2010 |
| 7672200 | Method of inter-layer search in a disk drive A method of inter-layer search of a multi-layer disk, the method including determining whether a search is required of a layer other than a currently accessed layer; searching the currently accessed layer for a position corresponding to a target address on the layer... | 03/02/2010 |
| 7660211 | Servo control apparatus, servo control method, optical disc apparatus and video camera recorder A servo control apparatus includes: a drive section that applies a thrust to move a driven object; a storage section that stores a control circuit output initial value; an approaching control section that moves the driven object toward a target position; an error si... | 02/09/2010 |
| 7656758 | Device for playing optical discs A disc drive apparatus (1) for optical discs (2) comprises: a frame (3); a sledge (10) displaceably mounted with respect to said frame (3); a lens actuator (43, 21) displaceably mounted with respect to said sledge (10... | 02/02/2010 |
| 7646681 | Method of automatically pausing optical pickup in DVD-RAM disc drive A method of automatically pausing an optical pickup in a DVD-RAM disc drive includes driving a DVD-RAM disc; determining whether a tracking error signal is generated during the driving of the DVD-RAM disc; generating a land/groove signal to discern land tracks and g... | 01/12/2010 |
| 7643388 | Optical disc apparatus and optical-pickup movement control method installed in optical disc apparatus A light beam is emitted to an optical disc from an optical pickup. The optical pickup is moved over the optical disc so that a light spot of the light beam crosses tracks formed on the optical disc. Detected are tracking error signals carried by a light beam reflect... | 01/05/2010 |
| 7626898 | Disk device, and position determination method for pickup head This disk device includes a pickup head (PUH), a PUH shift control unit, and an inner circumference position detection unit. The PUH reads out data upon a disk. The inner circumference position detection unit detects whether or not the PUH has shifted to the inner c... | 12/01/2009 |
| 7623419 | Method and apparatus for measuring off-track detection sensitivity An off-track duty measurement unit measures off-track detection sensitivity on the basis of an off-track signal, and track cross cycle information that is obtained from a tracking error signal measured by a track cross cycle measurement unit, whereby off-track detec... | 11/24/2009 |
| 7619952 | Track calculation method for fixing track jumps of optical discs of different capacities An appropriate track calculation equation is inducted according to a relationship between a storage area and a track pitch of a compact disc, and a pickup unit is instantly shifted to a location calculated with the track calculation equation. Therefore, an error aft... | 11/17/2009 |
| 7616534 | Method for determining kind of optical recording medium A method for determining a kind of optical recording medium includes: performing focus searching and track searching on an optical recording medium; and determining a kind of optical recording medium according to an optical signal generated by the focus searching an... | 11/10/2009 |
| 7616535 | Method for determining track searching direction A method for determining a track searching direction is disclosed. The method takes advantage of the characteristic that the movement of the photo-diode with respect to the optical disk is not perpendicular to the track direction. Therefore, the phase difference bet... | 11/10/2009 |
| 7586817 | Appliance for recording or playing back information having means for detecting or moving the scanning location on a disc with a wobble track The invention proposes an appliance for recording or playing back information having means for detecting or moving the position of a scanning device over a disc with a wobble track, said appliance being able to be used both in recorded and in unrecorded areas of the... | 09/08/2009 |
| 7580330 | CE to RRO cancellation for sled control An apparatus comprising a center error creation circuit, a center error controller, and a center error repeatable run out circuit. The center error creation circuit may be configured to generate a center error signal in response to photo-diode signals. The center er... | 08/25/2009 |
| 7561501 | Servo control device, optical disk drive, and servo control method A servo control device couples with an optical pickup head, which outputs a TEZC (tracking error zero crossing) signal. The servo control device includes a detection module, a signal generation module, and a selection module. In this case, the detection module detec... | 07/14/2009 |
| 7558165 | Disc drive calibration with forced track traversing signal A signal generator generates a track traversing signal, and a driver causes a pick-up to traverse across tracks of a disc in accordance with the track traversing signal. An error signal generator generates a tracking error signal from the pick-up traversing across t... | 07/07/2009 |
