Matches 1 - 36 out of 36


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US20050249063 Method of reactivating servo control system  
A method of reactivating a servo control systems for applying in an optical disc drive, comprising: activating a servo control system, for exerting a servo control on a spindle motor; if the servo...
US20090285060 METHOD OF ADJUSTING GAIN BALANCE OF OPTICAL TRANSDUCER  
A method of adjusting gain balance of an optical transducer includes the following steps. First, two external gains are predetermined. Next, the projection position of a reflection spot is...
US20110249541 OPTICAL DISC UNIT AND SERVO CONTROL METHOD FOR ACTUATOR THEREOF  
In servo control of actuators of an optical disc unit, a gain margin is secured by measuring a mean current or mean voltage applied to each of a focus actuator and a tracking actuator, estimating...
US20050007902 Optical disk reproducing device  
An optical disk reproducing device provided with servo automatic adjustment means for automatically performing an adjustment of setting an operation criterion to a servo mechanism, and also...
US20050052963 COMPENSATOR CIRCUIT FOR AN OPTICAL STORAGE DEVICE  
A compensator circuit comprises a phase-lead compensator for receiving an error signal generated by an optical storage device and generating a phase-lead error signal, a band-pass filter connected...
US20080025167 CALIBRATION APPARATUS AND RELATED METHOD FOR SERVO SYSTEM OF OPTICAL DISC DRIVE  
A calibration apparatus for calibrating a servo loop gain of an optical disc drive is disclosed. The calibration apparatus includes an estimation unit, a decision unit, and a gain control unit....
US20110134733 TILT ADJUSTMENT CONTROL METHOD OF NEAR-FIELD OPTICAL SYSTEM  
A tilt adjustment control method for a near-field optical system is provided. The method includes the following steps. A gap between a lens and a disc is detected. A gain corresponding to the gap...
US20080094955 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...
US20070058502 SERVO SYSTEM AND RELATED METHOD OF ADJUSTING THE MAGNITUDE OF DETECTING SIGNALS OUTPUTTED FROM A PICK-UP HEAD BEFORE UTILIZING THE DETECTING SIGNALS TO GENERATE SERVO SIGNALS  
A servo system of an optical storage device and related method for generating a servo signal. The servo system includes a pick-up head for detecting signals reflected from an optical disc to...
US20070133366 Optical Disc Apparatus and Optical Pickup Unit  
An optical disc apparatus comprising: an optical pickup unit having a semiconductor laser that radiates a laser light beam which is to be applied to an optical disc, a photo detector that has a...
US20070297302 APPARATUS AND METHOD FOR SERVO BALANCE CALIBRATION IN OPTICAL DISC DRIVER  
An apparatus and method for servo balance calibration in an optical disc driver are described. The optical disc driver comprises an OPU for emitting light beam to an optical disc and detecting a...
US20090052292 Method and system for signal gain control in optical disc drives  
A signal gain control method and system for use in optical disc drives to prevent undesirable saturation occurrences in circuit operations. The method includes fetching a preset reading front...
US20050117471 Optical disc device  
An optical disc device comprises a tracking position error signal generation unit for outputting a first reflection light amount signal that is generated by performing addition or subtraction on...
US20080225657 Optical Disc Actuator Control at Optimal Bandwidth  
A method and apparatus for a feedback loop (30) used with a servo controller (14) to control an actuator (13, 17) of an optical disc drive. The gain (18) in the feedback loop (30) determines the...
US20050162997 Method and system for controlling disk servo  
Disclosed is a system and method for controlling a driving speed of a motor by controlling a gain of a servo according to a predetermined reference corresponding to the external environment. The...
US20070223327 OPTICAL DISC DRIVE AND METHOD OF CONTROLLING ACTUATOR  
The present invention comprises a tracking actuator which drives an objective of a pickup emitting the laser beam, in accordance with a drive signal, a detector which detects or estimates a...
US20050063287 Optical disk reproducing apparatus, and offset adjustment method  
When a gain control circuit is its maximum gain, an offset adjusting circuit generates an offset adjusting voltage so that an offset voltage included in an output signal of this gain control...
US20050052960 Method and apparatus to generate tracking error signal, optical storage drive using the same, and lead-in control method for the optical storage drive  
A method and apparatus to stably generate a tracking error signal even for a compact disc (CD) with a pit depth of about λ/4 or a narrow track pitch in an optical storage drive, an optical storage...
US20050024998 Servo control method and servo control circuit, and optical disk device having the same servo control circuit  
A servo error signal and a defect detection signal are generated from an output signal of the pickup unit, and a servo control signal and a hold signal are generated from the servo error signal....
US20090196133 SIGNAL PROCESSING APPARATUS FOR OPTICAL DISC AND METHOD THEREOF  
A signal processing apparatus for an optical disc with a first type region and a second type region includes a processing module and a determining unit. The processing module is used for...
US20070104050 Focus control device and tracking control device  
There is provided a focus control device including sensor means (101); error signal synthesizing means (102); arithmetic means (103) having an error input portion (104), a disturbance addition...
US20060133234 Optical disc apparatus  
An optical disc apparatus includes a servo gain adjuster, which includes a disturbance signal supplying unit that generates plural disturbance signals of different frequencies and supplies them in...
US20070127331 Layer jump control apparatus and method  
A layer jump control apparatus and method is provided to control an optical drive during a layer jump operation. According to the magnitude variations of a focus error signal during a...
US20070211587 OPTICAL DISK APPARATUS AND DISK DISCRIMINATION METHOD  
A controller of an optical disk apparatus moves a pickup head to a data area of an optical disk, and radiates a first DVD laser beam to the optical disk. The controller measures, as a first...
US20070206459 Optical disc apparatus  
An optical disc apparatus includes a spherical aberration correction element for correcting spherical aberration and a preadjustment unit for obtaining setting of a spherical aberration correction...
US20070274173 Laser focus controlling method on an optical disk and an optical disk apparatus with using thereof  
In a focus controlling method of a laser beam for an optical disk, achieving a stable focus drawing-in, lowering ill influences due to stray lights, detecting an electric signal, which is...
US20070242576 METHOD AND APPARATUS OF DETERMINING BIAS VOLTAGE OF SERVO SIGNAL IN OPTICAL DISC DRIVE  
A method for determining a bias voltage of a servo signal of an optical disc drive is disclosed. The method includes: generating a plurality of sensing signals via an optical sensor of the optical...
US20070076543 Information recording apparatus, information reproducing apparatus, information recording method, and information reproducing method  
An optical disc apparatus comprises a focus error detector which detects a focus error, a focus adjusting unit which adjusts a focus of a light beam at either of recordable layers based on an...
US20080181063 OPTICAL DISC APPARATUS  
According to one embodiment, an optical disc apparatus provides a signal processing circuit that obtains a reflection amount of reflection light from a recording layer of a recording medium from a...
US20110292777 METHOD FOR CALIBRATING TRACKING ERROR SIGNAL IN OPTICAL DISK DRIVE  
A method is provided to start calibrating TE signals in an optical disk drive by checking the change of focus balance, outputting a first TE signal by adjust to a predetermined gain, measuring the...
US20050007901 Optical disc apparatus  
In an optical disc apparatus, when a lens of a pickup head is moved from a predetermined point A to point B and a base point of a focus pull-in range is detected, a point D, which is an initial...
US20100182881 RECORDING DEVICE, AND OPTICAL DISK SIGNAL PROCESSING METHOD  
An optical disk signal processing unit (200) performs tracking control to control a position of a converging lens (103) of an optical pickup (100) based on a tracking error signal, and a track...
US20160225400 OPTICAL DISC DEVICE AND SPHERICAL ABERRATION ERROR SIGNAL DETECTION METHOD  
There is provided an optical disc device that performs recording on a land and a groove, including an optical path splitter configured to split a luminous flux returning from an optical disc into...
US20140029400 Servo Processor Receiving Photodetector Signals  
A focus servo system for an optical disk drive includes an optical pick-up unit comprising at least one photodetector. At least one analog to digital converter is configured to digitize signals...
US20130308432 METHOD AND APPARATUS FOR GENERATING TRACKING ERROR SIGNAL AND OPTICAL INFORMATION STORAGE SYSTEM INCLUDING THE APPARATUS  
Provided are an apparatus and method of generating a tracking error signal, and an optical information storage system including the apparatus. The apparatus includes a bias signal generator for...
US20110261663 INTEGRATED CIRCUIT AND OPTICAL DISC APPARATUS  
An integrated circuit includes a focus control section configured to perform focus control to generate a drive signal for the focus direction displacement section based on a focus error signal, a...

Matches 1 - 36 out of 36