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| Number | Title | Issue Date |
| 7453773 | Method of eliminating home-in noise in optical disc drive by using variable step counter A method of eliminating home-in noise of an optical disc drive without a home limit switch and using a variable step counter, includes: resetting the variable step counter, which counts steps of a stepping motor of an optical pickup, to zero regardless of a position... | 11/18/2008 |
| 7366264 | Method and system for reducing noise in a multi-carrier signal A receiver 100 for receiving a multi-carrier signal comprises detection means for detecting 801 the presence of impulse interference within the signal and identifying one or more samples of the signal affected by the impulse interference, means for sel... | 04/29/2008 |
| 7362665 | Seek method of optical disks and optical storage device An optical disk includes a first area, a second area having time information undistinguishable from time information of the first area and a third area having unique time information. The third area is divided into a plurality of sub-areas. Peculiar zone numbers are... | 04/22/2008 |
| 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 |
| 7283444 | Method and device for determining disk size and stopping a rotating disk without using frequency generator signals A method and device for determining the presence or absence of a disk and/or a disk size without using FG signals, are provided. The method includes placing a pickup at a first zone on the optical recording medium, the first zone located between an outer radius of a... | 10/16/2007 |
| 7242660 | Power control device and method of single base power for optical disk drive A power control device of single base power is provided for an optical read/write module of an optical disk drive. The optical read/write module generates a power feedback signal and a temperature signal. The power control device includes a current compensating modu... | 07/10/2007 |
| 7202956 | Translation mechanism for opto-mechanical inspection An apparatus is disclosed for moving an optical component of an opto-mechanical inspection system relative to an object to be inspected using a linear actuator comprising a coil located in a magnetic field created by a magnet assembly. A translation stage is coupled... | 04/10/2007 |
| 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 |
| 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 |
| 7046912 | Reproducing apparatus and reproducing/recording apparatus memorizing identification information of optical information media and method thereof A reproducing apparatus and method for recording/reproducing record information to perform an information recording medium. A drive is provided for recording/reproducing recorded information to/from the information recording medium, and a non-volatile memory memoriz... | 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 |
| 7031091 | Magnetic recording apparatus and method of writing data at low temperature Deterioration in recording performance immediately after the start of recording in a magnetic recording apparatus due to the contraction of the magnetic head element in low atmospheric temperatures is prevented, thus ensuring a stable recording performance irrespect... | 04/18/2006 |
| 7031235 | Method for adjusting a speed-detection device for an object lens in an optical pickup head The invention provides a method for adjusting a speed-detection device for an object lens in an optical pickup head. The invention provides an adjusted optical disc drive, wherein the optical pickup head is accelerated/decelerated and the speed-detection device outp... | 04/18/2006 |
| 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 |
| 7020054 | Digital servo system with biased feed-forward A digital servo system with a biased feed-forward control is disclosed. The biased feed-forward control determines the low frequency component of a control signal from the digital servo system. The low frequency component can then be added to a future control signal... | 03/28/2006 |
| 6937546 | Optical disk device with improved track jump features An optical disk device starts movement of a thread in a track-on state, and releases the track-on state when the thread moves by a certain amount, and gives a driving kick signal to an actuator. The movement of the thread and actuator can be placed in sufficiently g... | 08/30/2005 |
| 6922377 | Recorded disk reproducing device capable of adjusting control voltages A CPU compares a detected moving speed with a previously set reference moving speed and when the detected moving speed is smaller than the reference moving speed, controls to increase a motor driving voltage VM to be supplied to a motor and when the detected moving ... | 07/26/2005 |
| 6922380 | Tracking and focus servo system with anti-skate algorithm An anti-skate algorithm in a tracking servo system of an optical disk drive is described. The anti-skate algorithm prevents skating during close of the tracking servo system by allowing the tracking servo system to close on a tracking error signal with an appropriat... | 07/26/2005 |
| 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 |
| 6636466 | Method for track seeking of a reading head in an optic disk drive A method for track seeking of a reading head in an optic disk drive is disclosed. In seeking a track in a disk. the track number and the direction in the fine seek are used for adjusting a voltage waveform in the rough seek. The variation of an optic disk... | 10/21/2003 |
| 6621773 | Glitch protection method in optical storage device A track seeking and track locking method in an optical storage device capable of computing protection intervals such that any state transition of the TEZC signal and the RFZC signal within the computed protection interval is prohibited. The method is also... | 09/16/2003 |
| 6504804 | Moving body position detecting method and disc drive apparatus A plurality of periodical signals are generated as the moving body moves. The periodical signals are given respective fundamental values. The fundamental value of one of the periodical signals that has a maximum value is detected sequentially. An extensio... | 01/07/2003 |
| 6473369 | Methods and apparatus for regenerating track crossing signals for searches across unrecorded areas on read/write optical discs A fast-acting method of regenerating track crossing signals for track searches across unrecorded areas on read/write optical discs is provided. This is accomplished by comparing the in-phase and quadrature-phase track crossing signals generated by the opt... | 10/29/2002 |
| 6442109 | Motor control apparatus, motor control method, disk apparatus and disk access method for correcting an assumed value based on error information Even if an assumed value of a track pitch and an actual value thereof are different from each other, an optical pickup (2) can be positioned at a target position at high speed, which can realize higher-speed access. A drive-means control apparatus accordi... | 08/27/2002 |
| 6064633 | Track jumping controlling method/apparatus A disc apparatus includes a micro-computer. The micro-computer predicts a number of tracks for deceleration from a total number of tracks to be jumped, to thereby calculate a number of tracks for acceleration from the number of tracks for deceleration and... | 05/16/2000 |
| 5917784 | Trellis sequence detector for detecting a quadrature servo signal in disk recording systems A trellis sequence detector is disclosed for detecting a quadrature servo signal in optical disk storage devices. The quadrature servo signal is generated in discrete time and comprises two sinusoidal signals phase offset by 90 degrees. The sampling frequ... | 06/29/1999 |
| 5859817 | Optical disk apparatus and track access control method for optical disk apparatus for reducing the relative position shift between two beam spots which are emitted through two objective lenses An optical disk apparatus includes first and second objective lenses, a carriage, a moving mechanism, a fixed optical system, a main control section, track access control circuits, a first positional shift correction circuit, a second positional shift cor... | 01/12/1999 |
| 5852522 | Data recording apparatus for fast detection of servo sectors and correction of track address using a divided gray code and a parity bit A servo sector forming method for fast detection and corresponding track address correcting method. The track address correcting method for a disk driving/recording apparatus uses as a recording medium a disk comprised of a plurality of track groups. A pl... | 12/22/1998 |
| 5737282 | Optical disk apparatus and track access control method utilizing positioned shift between scanning beams An optical disk apparatus includes first and second objective lenses, a carriage, a moving mechanism, a fixed optical system, a main control section, track access control circuits, a first positional shift correction circuit, a second positional shift cor... | 04/07/1998 |
| 5726959 | Method for searching a track of a compact disk drive A method for accurately searching a target track of a disc in a disc drive is provided. The method includes the steps of: a) generating a reference signal having a predetermined period, b) moving a pickup across tracks from a starting point of a disc regi... | 03/10/1998 |
| 5598384 | Feed search system for optical disk recording device A phase shifting device including multipliers, a table and first adders, generates and outputs first shifted phase data and second shifted phase data obtained by shifting first feed phase data and second feed phase data as much as a phase displacement fro... | 01/28/1997 |
| 5426623 | Method for acquiring the track data from a multiple track image and optical disk A method of reading data from an optical disk comprises providing means for illuminating the required part of the disk and acquiring the optical image of a plurality of tracks, providing a detector matrix comprising a plurality of detectors, each of the d... | 06/20/1995 |
| 5218590 | Optical disk apparatus having improved recording capacity An optical disk apparatus comprises an information generating circuit for inserting a predetermined number of resync codes in information to be recorded to generate record information, an optical disk driver for recording the record information generated ... | 06/08/1993 |
| 5202864 | Slip-off preventing tracking control apparatus In an apparatus in which information is reproduced by projecting/receiving an optical beam to/from a recording carrier having a large number of information tracks, tracking control is performed so as to maintain a reproducing position on an information tr... | 04/13/1993 |
| 5191566 | Velocity detection method and apparatus therefor A velocity detection method and an apparatus therefor, in which the relative velocity between a light beam and tracks is detected on the basis of a period for which the light beam crosses the tracks, and under the condition that the light beam has passed ... | 03/02/1993 |
| 5179545 | Tracking control apparatus for controlling the tracking of a target track A tracking control apparatus is provided for controlling a displacement error between a pickup system and a track when reproducing information recording on an information-recording and reproducing medium having tracks on which information is recorded or r... | 01/12/1993 |
| 5177718 | Optical disk apparatus An optical disk apparatus comprising a head having an objective lens, a tracking controller, a CPU, and a counter. The CPU determines a tracking error if the count of the counter is greater than a predetermined value when the disk is rotated 360° after t... | 01/05/1993 |
| 5172353 | Track seeking control apparatus for use in data recording/reproduction systems having data tracks thereon A track seeking control apparatus includes an optical head for generating a signal comprising a train of track cross pulses when it crosses tracks on a recording medium. A first counter counts the train of track cross pulses generated by the optical head,... | 12/15/1992 |
| 5109366 | Slip-off preventing tracking control apparatus In an apparatus in which information is reproduced by projecting/receiving an optical beam to/from a recording carrier having a large number of information tracks, tracking control is performed so as to keep a reproducing position on an information track ... | 04/28/1992 |
| 5077716 | Optical recording and reproducing system having an accurate high-speed optical head positioning apparatus An optical recording and reproducing system having an accurate high-speed optical head positioning apparatus. In one embodiment, a positive acceleration is applied to the optical head until the optical head has moved half the distance to a target track. T... | 12/31/1991 |
