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7636280 |
Calibration of lens position in an optical disc drive
Disclosed are various systems, methods, and programs embodied in a computer readable medium for calibration of a lens position in an optical disc drive. In one embodiment, a method is provided that...
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7633840 |
Optimizing focus point for optical disc
An apparatus comprising a focus controller, a photo-diode sensor, a data circuit, a focus error creation circuit and a focus offset circuit. The focus controller may be configured to control a lens...
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7633839 |
Self-sensing active-damping voice coil
A control circuit creates a self-sensing active-damping voice coil. The control circuit includes a current sensor coupled to a voice coil. A first filter is coupled to the current sensor to create...
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7633842 |
Apparatus for generating tracking error signal in optical disc drive
The present invention discloses an apparatus for generating a TE signal in an optical disc drive. The disclosed apparatus includes a signal generation module, a quality detection module coupled to...
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7630278 |
Focusing control method for reading/writing optical disc
An optical reading/writing apparatus has an optical head that includes a collimator and a lens. For efficient and reliable focusing control for writing an empty optical disk, calibration of focus...
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7626899 |
Method for obtaining an optimum focusing point of an optical pickup unit and a servo system of an optical disk drive using this method
A method for obtaining an optimum focusing point of an optical pickup unit and a servo system of an optical disk drive using this method is disclosed. An optical pickup drive circuit controls a...
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7616539 |
Optical disc apparatus, tracking control method, and integrated circuit
An optical disc apparatus has: an optical head 400 for emitting a light beam onto a predetermined track of an optical disc 300 before tracking control in order to detect reflected light with a...
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7616533 |
Optical disc apparatus and access control method of the same
An optical disc apparatus, as a learning operation before a recording or reproducing operation, rotates an optical disc at a first speed to read PID information, discriminates between lands and...
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7616538 |
Method for setting layer-jump point on optical disc
A method for setting a layer-jump point on a multilayer optical disc in an optical drive for accessing the multilayer optical disc. First, a magnetic-pole cycle value is accumulated. Next, a lag...
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7616537 |
Focus search apparatus and method
Provided are a focus search apparatus and method for performing a focus search after moving an optical pickup to a focus-on point according to a signal output from a sine wave generator so that a...
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7616536 |
Apparatus for radial tracking in an optical disc drive using tracking an error signal derived from wobble-induced signal components and/or data-induced signal components of a detector output
An optical disc drive uses a tracking error signal derived from the wobble-induced signal components of the optical detector signal. This tracking error signal is relatively insensitive to...
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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...
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7606121 |
Optical disk drive with target focus control
An optical disk drive includes: a light source for producing a light beam; an objective lens for converging the light beam; an actuator for moving the objective lens with respect to an optical...
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7606122 |
Layer-jumping and focusing control method
In a layer jump and focusing control method, a first focusing error signal is generated according to the differential astigmatism method in a closed-loop focusing control manner when focusing on...
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7602680 |
Focus control for optical scanner
The present invention relates to a method for correcting the operating point of a focus control loop for a scanner for optical storage media. According to the invention, the method comprises the...
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7593300 |
Digital tracking servo system with off-format detection
An off-format condition in a digital tracking servo is presented. An off-format condition can be detected by low pass filtering a tracking control signal, detecting a DC level over a threshold...
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7593295 |
Apparatus and method for compensating for defect of optical disc
An apparatus for and a method of compensating for a defect of an optical disc. The method includes: detecting a disc defect zone according to an RF sum signal level read from the optical disc;...
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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...
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7586818 |
Optical disc apparatus and semiconductor device
The purpose is to provide an optical disc apparatus which can accurately calculate a gain for focus control. An optical apparatus ( 100 ) includes: an FE generator ( 20 ) for generating an FE...
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7583568 |
Focus control device and method of adjusting focus gain prior to focus-servo operation
An optical pickup 4 that converts the reflected light from a laser light irradiated onto a disc into an electrical signal, is provided with an objective lens 42 that performs the irradiation of...
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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...
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7580331 |
Center error mechanical center adjustment
An apparatus comprising a center error creation circuit, a center error offset injection circuit and a center error controller. The center error creation circuit may be configured to generate a...
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7580328 |
Method, medium, and device changing a play mode
A method, medium, and device changing a play mode if an error occurs in a process of discriminating the type of optical discs. The method includes the operation of discriminating a type of an...
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7577066 |
Method and apparatus for providing high speed recording on an optical medium
A system and method for controlling the position of an optical head of a disc during high speed recording. In one embodiment of the method, an optical disc has a plurality of tracks. The method...
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7558170 |
Optical pick-up head, optical information apparatus, and optical information reproducing method
An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a...
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7551527 |
Offset calibration system and method of automatic power control loop
An offset calibration system of a control loop at least comprises an optical-to-electrical converter and an electrical-to-optical converter. The optical-to-electrical converter generates a...
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7548493 |
Extended focus control
An apparatus for scanning a track on a record carrier has a head ( 41 ) for providing a beam of radiation and generating at least one sensor signal. The device has a focusing unit for controlling a...
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7545709 |
Optical disk apparatus having servo parameter setting unit
An optical disk apparatus decides reading time parameters to be set in a tracking error signal generation part at the reading time by applying a laser light of record power to an optical disk. A...
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7542387 |
Defocus detection device, defocus detection method and optical disk unit using the same
Defocus detection device and method capable of detecting a defocus accurately during recording of information to an optical disk having a plurality of recording layers and an optical disk unit...
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7539091 |
Differential push-pull gain controlling method and apparatus to reduce the effects of rotational eccentricity
An apparatus comprising a photo diode array, a differential push-pull generator circuit and an attenuation prediction circuit. The photo diode array may be configured to generate a plurality of...
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7529161 |
Information reproduction device and information reproduction method for reproducing information by switching to servo polarity corresponding to land track and groove track and information recording method for recording information by switching to servo polarity corresponding to land track and groove tract
An information reproduction method according to an aspect of this invention is directed to an information reproduction method which reproduces information from an information storage medium on...
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7525883 |
Optical disk apparatus
An optical disk apparatus is provided with an actuator that moves a beam spot that is formed by an optical head on an optical disk to recording surfaces; position control portions that control a...
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7525884 |
Position control apparatus and method for an optical disk recording/reproducing apparatus with interlinked on/off of a phase compensator and on/off of a servo loop
The present invention aims to obtain a position control device which, even if the range within which a mechanical part can be pulled in for position control is narrow, enables quickly stabilizing...
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7522482 |
Optical pickup device and apparatus for reading data from optical storage medium
An optical pickup is provided for preventing an objective lens from colliding with an optical recording medium at the stage of initial adjustments. The optical pickup device comprises a servo...
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7522485 |
Method for adjusting focus or tracking detection unit, and optical disc device
An optical disc device comprises a spherical or coma aberration correction unit to pre-correct spherical or coma aberration occurring in the light beam, a focus or tracking detection unit operable...
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7518961 |
Optical disk recording and reproducing apparatus for recording and reproducing data in and from optical disk
An optical disk recording and reproducing apparatus includes a focus unit that focuses an irradiation light beam on an optical disk having data recording layers and tracks; a drive unit that...
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7518960 |
Method and apparatus for positioning beam spot on recording medium
A method and apparatus position a beam spot on a recording medium. The positioning includes (a) observing a first center error in a first closed loop control during tracking mode, the first center...
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7499382 |
Method for gain adjustment for production of a lens position signal, and a corresponding appliance for reading from and/or writing to an optical recording medium
A lens position signal LCE which indicates the discrepancy between the lens and its geometric mid-position is required for coarse tracking of optical storage drives. The prior art is for the lens...
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7492678 |
Apparatus and method for stabilizing operation of disc driver in section for setting mode conversion
An apparatus which stabilizes an operation of a disc driver in a mode conversion setting section includes a pickup which reads information from a disc that is inserted into the disc driver, a...
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7483346 |
Digital disk read/write device
A device for reading from and/or writing on a rotating disk including a mobile opto-electromechanical device placed above the disk and connected to a motherboard via a set of electric wires. The...
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7480218 |
Optical disk control device with focal point movement control
The present invention provides an optical disk control device that can perform focus pulling in a short time for a target information surface of an optical disk having a plurality of information...
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7468935 |
Optimized tracking method
The invention relates to a method for optimized tracking of an optical scanner along a track of an optical recording medium, the track having information markings arranged in dense succession, and...
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7460455 |
Method for determining relationship between difference of object lens location and driving control effort in optical storage device and apparatus thereof
A method used in an optical storage device having a pickup head. The pickup head includes an object lens, a first and a second light source. The object lens focuses the laser light generated by the...
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7443774 |
Optical head and data processing apparatus including the same
An optical data processing apparatus reads and/or writes data from/on a data storage medium, in which first and second data storage layer are stacked, by radiating light from the second layer. The...
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7436739 |
Optical disk drive and correcting method for differential push-pull tracking error signals of the optical disk drive
The invention is disclosed a correcting method for differential push-pull(DPP) tracking error signals of an optical disk drive. A Step (A) divides a CD into a plurality of areas according to...
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7426159 |
Method of reproducing optical disk and optical disk reproducing apparatus
A method of reproducing an optical disk that that shortens the time between optical disk insertion and implementation of a standby mode enabling reproduction is provided that comprises a step of...
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7423940 |
Signal processing method and signal processing apparatus
A signal processing apparatus is provided with a converter for converting at least one analog light detection signal into a digital light detection signal, and a signal generator for generating at...
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7420348 |
Drive apparatus
Optical disc drives designed for reduced power consumption switch the supply voltage in three stages between first, second, and third power supplies. The reduction in power consumption that is...
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7414928 |
Method for determining sub-beam add signal (SBAD) value
A method for determining a sub-beam add signal (SBAD) value is provided. At first, a j th read SBAD value is obtained at the j th read status. Next, the j th write SBAD value is determined...
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7414940 |
Calibration of a focus error signal gain in a focus servo system
A calibration of a focus error signal gain in a focus servo system of an optical disk drive is presented. The focus error signal gain can be calibrated by oscillating an optical pick-up unit in a...
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