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| Number | Title | Issue Date |
| 8130602 | Optical disk drive Provided is an optical disk drive including: an actuator for driving an objective lens for applying a beam from a laser to an optical disk to cause a focal point of the beam to move in a focus direction; and a servo controller for receiving an input of a focus error... | 03/06/2012 |
| 8111596 | Phase error detection apparatus A phase error detection apparatus capable of performing offset correction of a tracking error signal accurately even when there is a defect or a non-recorded position on an optical disc. There are provided a phase difference detection circuit (107) which rece... | 02/07/2012 |
| 8089834 | Apparatus for controlling servo signal gains of an optical disc drive and method of the same The invention provides an apparatus for controlling servo signal gains of an optical disc drive. The apparatus adjusts the gains of a plurality of servo signals controlling a servo system of the optical disc drive when the optical disk drive encounters an operating ... | 01/03/2012 |
| 8085630 | Optical disk apparatus A servo control of an optical disk apparatus increases a suppression degree of an iterative learning control system, against a frequency disturbance of integer multiple of rotation frequency in a predetermined rotation phase range including a range, in which a servo... | 12/27/2011 |
| 8085629 | Optical focus error offset to reduce radial to vertical crosstalk A method and system are provided for minimizing or optimising radial to vertical crosstalk (RVC) in an error signal in an optical record carrier reader is record carrier losed. Focus error offset values are applied to the reader. The radial to vertical crosstalk is ... | 12/27/2011 |
| 8050153 | Method for adaptively driving a tracking element with mechanical deviation and device using the same The present invention provides a method for adaptively driving a tracking element with mechanical deviation and a driving device using the same. The method comprises the following steps: recording standard moving time and a standard motor current value, supplying dr... | 11/01/2011 |
| 8027229 | Focus control device, and optical disc device In a device for controlling a focus to an optical disc having a land section and a groove section, the control is performed so as to avoid a focus step difference at a land-area/groove-area switching point. When performing write-in or readout of data to an op... | 09/27/2011 |
| 8027230 | 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... | 09/27/2011 |
| 8000185 | Drive signal generation circuit A drive signal generation circuit comprising: a tracking signal output circuit to output a tracking signal based on an error signal indicating a track deviation of laser light output from the optical pickup relative to a track, the tracking signal being a signal for... | 08/16/2011 |
| 7990818 | Cascaded control of a pick-up head for multi-layer optical data storage A system and method of controlling position of a pick-up head of an optical drive, including manipulating the position of the pick-up head as a primary variable in a cascade control scheme, and manipulating current flowing through the pick-up head as a secondary var... | 08/02/2011 |
| 7983120 | Optical disk apparatus, focus control method and optical disk The present invention provides an optical disk apparatus capable of stably performing a layer jump on an optical disk having plural recording layers and non-uniform interlayer distances. In an optical disk with at least three recording layers and non-uniform interla... | 07/19/2011 |
| 7978570 | Driving apparatus and method, program, and recording medium A driving apparatus includes: a driving mechanism slider-driving a head including a first optical pickup and a second optical pickup, the first optical pickup and the second optical pickup having a same specification; a calculating mechanism performing predetermined... | 07/12/2011 |
| 7974160 | Plant gain calibration for an optical storage servo system A gain calibration method for optical storage servo systems in which, plant gain calibration is used by injecting a reference sine wave r into an optical storage servo system, obtaining an effort signal m at the input of the servo plant and an error signal y at the ... | 07/05/2011 |
| 7969833 | Optical disc apparatus In servo control within an optical disc apparatus, when iterative learning control is started, the servo characteristics are modified to servo characteristic giving increased gains during a given period of time. Under this condition, the iterative learning control i... | 06/28/2011 |
| 7965593 | Information recording medium, integrated circuit, recording/playback apparatus, computer program, and information recording/playback method An optical disk 101 in which information is recorded on a groove track, and an optical disk 107 in which information is recorded on a land track. The optical disk 101 has a control data area 102, and a data recording area 103 in wh... | 06/21/2011 |
| 7965592 | Information recording medium, integrated circuit, recording/playback apparatus, computer program, and information recording/playback method An optical disk suppressing the time required for a startup of a recording/playback apparatus from unduly increasing, even when there is (i) one type of disk where information is recorded on a groove track, and (ii) another type of disk where information is recorded... | 06/21/2011 |
| 7948840 | Optical disc device and converging position correction method An optical disc device that irradiates an optical beam to an optical disc including a recording layer for recording information and a positioning layer provided with a track for identifying a recording position of the information on the recording layer, includes: ob... | 05/24/2011 |
| 7948839 | Optical disk apparatus An optical disk apparatus includes: an optical pickup unit for reading out information recorded on an optical disk; a demodulation circuit for demodulating digital data from an output signal of the optical pickup unit; and a controller for performing a servo control... | 05/24/2011 |
| 7944785 | Optical disc recording/reproducing apparatus and focus-servo method thereof A focus-servo control method of an optical disc recording/reproducing apparatus, for recording or reproducing information onto/from an optical disc having a track with a land and a groove, which are formed in a spiral manner on an information recording surface there... | 05/17/2011 |
| 7933177 | Optical pickup apparatus, optical read/write apparatus, and gap control method An optical pickup apparatus includes a light source, focusing optics, a light detector, a controller, and a drive unit. The drive unit first drives the focusing optics to a specific position on an information recording medium. Light from the light source irradiates ... | 04/26/2011 |
| 7920446 | Optimizing focus point for optical disc An apparatus includes a first circuit and a second circuit. The first circuit may be configured to generate status signals and an error signal in response to accessing a storage medium. The error signal provides a first value based on an accuracy of accessing the st... | 04/05/2011 |
| 7916586 | Near field optical recording/reproducing apparatus and method of normalizing gap error signal of the same A near field optical recording/reproducing apparatus includes a light source, an objective lens to form a spot by focusing light emitted from the light source, a solid immersion lens to generate an evanescent wave by using the spot formed by the objective lens, a ph... | 03/29/2011 |
| 7911891 | Apparatus for controling servo signal gains of an optical disc drive and method of same The invention provides an apparatus for controlling servo signal gains of an optical disc drive. The apparatus adjusts the gains of a plurality of servo signals controlling a servo system of the optical disc drive according to a closed-loop mode or a state-reloading... | 03/22/2011 |
| 7911892 | Center error mechanical center adjustment An apparatus comprising a center error creation circuit and a center error offset injection circuit. The center error creation circuit may be configured to generate a center error signal in response to light from a main laser reflected from a surface of an optical d... | 03/22/2011 |
| 7907481 | Optical disc drive device and tilt correction device An optical disc drive device has an FE signal generator which generates a focus error signal, a TE signal generator which generates a tracking error signal, a return beam detector which detects a return beam reflected by an optical disc after irradiated by an optica... | 03/15/2011 |
| 7894312 | Automatic gain control circuit and signal reproducing device In a signal reproducing device, for securing the stability in the steady state while enhancing the response of automatic gain control, a variable gain amplifier 109 adjusts the amplitude of a reproduction signal outputted from a head amplifier 108. A g... | 02/22/2011 |
| 7889606 | Optical disc drive and control method thereof An optical disc drive and a control method thereof are disclosed to prevent unstable servo-control of a pickup module caused by an abnormal control signal, when recording/reproducing/erasing of information on/from an optical disc in the optical disc drive, and in pa... | 02/15/2011 |
| 7876649 | Optical disc recording and reproducing apparatus A DSP of the DVD recorder includes a balance value setting portion for determining an appropriate value of a focus balance value α when information is reproduced from an optical disc so as to record the determined focus balance value α0 in a balance value s... | 01/25/2011 |
| 7864638 | Optical disk apparatus An optical disk apparatus according to the present invention is capable of reading data from an optical disk 102 which has a plurality of information recording layers, including a first information recording layer whose distance from a disk surface is relativ... | 01/04/2011 |
| 7864639 | Optical disk apparatus An optical disk apparatus includes a signal detection unit which detects a signal corresponding to a wobbling guide groove formed on an optical disk, a timing signal generating unit which generates first and second timing signals in accordance with an amplitude leve... | 01/04/2011 |
| 7852716 | Optical disk drawing apparatus, optical disk drawing system and optical disk drawing method In the optical disk drawing apparatus of the present invention, an automatic adjusting area where the drawing operation is not carried out is provided in the optical disk, laser light is irradiated onto the formed automatic adjusting area so as to control the focus ... | 12/14/2010 |
| 7848188 | Device and method for use in optical record carrier systems A signal-processing device (301) for controlling a focus actuator (309) in an optical disc system (30), wherein the signal processing device (309) generates a focus actuator control signal (CS) to be supplied to the focus actuator (309... | 12/07/2010 |
| 7839732 | System and method for calibrating recording track offset of optical storage device A system and method for calibrating a recording track offset of an optical storage device accessing an optical storage medium of land/groove type. The system includes: a tracking servo loop arranged to control tracking operations of an optical head of the optical st... | 11/23/2010 |
| 7830757 | Tracking control method for reading/writing optical disk In a tracking control method for use in an optical disk drive to read/write an optical disk, an open-loop tracking control operation of the optical disk drive is first performed according to an input tracking error signal and a predetermined periodical offset to gen... | 11/09/2010 |
| 7830758 | Optical disk drive and pickup device An optical disk drive includes focusing means, moving means for moving the focusing means in a direction perpendicular to a track direction, light detection means having a first light acceptance section accepting a light beam reflected by one information recording l... | 11/09/2010 |
| 7821885 | TE signal polarity determining system and related method thereof Disclosed is a TE signal polarity determining method, which includes: (a) obtaining a detection signal from an optical disc; (b) obtaining characteristics of the detection signal corresponding to different polarities of the TE signal; and (c) determining whether an ... | 10/26/2010 |
| 7800989 | Disc-driving apparatus and method for controlling the same A disc-driving apparatus has an optical pickup including an objective lens. The objective lens has an optical axis that is met on a line excluding a central axis of revolution of a disc. The apparatus has storage device that stores plural correction values obtained ... | 09/21/2010 |
| 7800990 | Method for selecting focus servo process Provided is a focus servo process automatic selecting method. In a related art optical pickup apparatus, only one of AD and DAD is selected and used when a focus servo is performed for disk detection and a focus-on operation. According to the method, servo crosstalk... | 09/21/2010 |
| 7800991 | Optical disk device There is provided an optical disk device that performs a focus jump operation in a stable and prompt manner. The optical disk device includes an objective lens, a light-detecting element, a lens holder, a shaft member configured to penetrate a hole, a focus drive me... | 09/21/2010 |
| 7796476 | Optical disk device and optical disk gain adjusting method An optical disk device includes a optical pickup head which emits a laser beam to an optical disk and detects light reflected therefrom, a signal output unit which outputs at least a servo signal and RF signal in accordance with the detected light, a gain control un... | 09/14/2010 |
