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US20050063286 Control module for an automatic gain control device of an optical disc playback apparatus  
A control module for an automatic gain control device of an optical disc playback apparatus includes a constant-gain setting member and a switch member. The playback apparatus includes an optical...
US20090154308 OPTICAL DISC APPARATUS, GAIN SETTING METHOD AND PROGRAM  
There is provided an optical disc apparatus that includes a sound pickup portion, an optical pickup to record a sound picked up by the sound pickup portion as audio data onto an optical disc using...
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...
US20070206456 TRAJECTORY MAPPING FOR IMPROVED MOTION-SYSTEM JITTER WHILE MINIMIZING TRACKING ERROR  
Methods and apparatus to compensate for low-frequency tracking errors in motion control of a movable stage are provided. By recording tracking errors during earlier traversal of a trajectory,...
US20050030847 Method for correcting a position of an optical pickup before track following  
A method for correcting a position of an optical pickup before track following is disclosed. The actual position of the optical pickup before seeking is detected. Then, a sled motor control signal...
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...
US20070291602 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...
US20070183277 Optical disk replay device  
An optical pickup irradiates laser light upon a track of an optical disk and receives light reflected therefrom. A tracking actuator shifts an objective lens of this optical pickup in a tracking...
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...
US20070183278 OPTICAL DISC DRIVE, METHOD OF MOVING BEAM SPOT AND COMPUTER-EXECUTABLE PROGRAM IMPLEMENTABLE BY THE OPTICAL DISC DRIVE  
An optical disc drive includes a light source, a lens, a focusing section, a spherical aberration corrector, a focus signal generator, a gain calculator and a processor. The focusing section forms...
US20070121439 Optical disc drive and method for controlling the position of a lens  
An optical disc drive having a lens position motor (24) for control of a lens position relative to a track on a disc (10) and a second (“sledge”) motor (25) for control of the position of the...
US20070121442 Tracking control method and optical disk drive  
A tracking control method controls an optical disk drive to access an optical disk having a plurality of groove tracks and land tracks, which are alternately interlaced with each other. The...
US20070286039 Tracking controlling apparatus, method and program  
An off-track state is to be detected accurately. A photodetector 11 converts the light reflected from an optical disc into an electrical signal. A MIRR signal generating circuit 16 generates a...
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...
US20080019237 FOCUS CONTROL IN A MULTIPLE-BEAM DISC DRIVE  
A method for controlling an optical disc drive apparatus (1) which comprises: light beam generating means (31) for generating a plurality of N optical beams (32(i)); means (33, 34, 37) for...
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...
US20050163000 Optical information recording/reproducing device for performing at servo control by DPP method  
An optical information recording/reproducing device makes use of a differential push-pull (DPP) method. In the optical information recording/reproducing device, after amplification of a push-pull...
US20070014209 Method and circuit for protecting optical pickup actuator  
A method for protecting an optical pickup actuator includes generating an abnormal control signal using signals used to control focusing and tracking, and generating a protection command signal...
US20070195661 Power down apparatus for optical data drive  
In an optical drive system, a “power down state” with a fast “leave power down” timing is provided. In order to meet these timing requirements, when the controller switches the system from a...
US20070263503 Infromation reproducing apparatus and method for measuring surface deflection  
The present invention relates to an information reproducing apparatus that includes an objective lens that focuses a light beam toward a rotating optical disc medium and uses the objective lens to...
US20070280064 OPTICAL DISK DEVICE  
An optical disk servo device capable of correcting spherical aberration occurring by thickness errors of a cover layer of an optical disk or disc while avoiding risks of influence by vibrations...
US20070263502 METHODS FOR START-UP LENS  
Methods for start-up lens. The lens moves from a stowing position to a standby position along an axis, and a reset point, a first turning point, a second turning point, and a third turning point...
US20060104170 Method for performing servo control for blank discs  
A servo control method for blank discs is provided. When an optical disc is loaded, servo control suitable for the type of the loaded disc is performed. When the optical disc is a blank disc, data...
US20070076546 Optical disc apparatus and tracking error signal selecting method  
An optical disc apparatus comprises a driving unit which drives an optical pickup head (PUH) for irradiating laser light onto an optical disc in such a manner that laser light is irradiated onto a...
US20070177469 Optical disk drive  
In an optical disc drive that needs an aberration correcting element for correcting spherical aberrations, it takes long time to conduct a processing operation of the aberration correcting element...
US20060126455 Tracking device  
An MPU vibrates a track actuator with a predetermined amplitude while the focus servo loop is closed. The MPU calculates the number of tracks on a disk that the actuator crosses from a track error...
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...
US20070280066 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...
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...
US20080094952 Layer jump on a multi-layer disc  
A method and an apparatus for writing on a multi-layer disc are described. The occurrence of a layer jump, due to the fact that e.g. the storage space available on a first layer is exhausted, is...
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...
US20070291600 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.
US20070263501 Protection mechanism of an optical disc drive and method thereof  
An optical disc drive includes a pickup head for receiving a reflective light from an optical disc and detecting a reflection signal accordingly, a derived signal generator for generating a...
US20050265136 Feedback control system and method thereof  
A feedback control system includes an optical pickup head, a temperature sensor, a microcontroller and a servo control system. The optical pickup head emits a laser beam onto an optical disk to...
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....
US20080094953 FOCUS PULL-IN METHOD AND OPTICAL DISC DRIVE THEREOF  
A focus pull-in method to perform an accurate focus pull-in operation in an optical disc drive using a holographic optical element (HOE) in consideration of a pseudo s-curve and an optical disc...
US20070053256 Method and device for adjusting an amplification for producing a focus error signal  
In drives for optical storage media, a focus error signal generated by means of weighted addition from main beam and secondary beam focus error signals always contains an undesired component of...
US20050213443 Method for generating gain-adjusted tracking error signal  
A method for generating a gain-adjusted tracking error signal in a disc reading apparatus includes the following steps. Firstly, a disc having been defined with a data region and a blank region is...
US20070133376 Read apparatus and a method of detecting deterioration of a disk  
For providing a read apparatus and a method of detecting deterioration of a disk, which can detect the deterioration of the disk securely at a low cost, when focus adjust and tracking adjust of an...
US20070140077 OPTICAL DISC RECORDING APPARATUS CAPABLE OF MARKING LABEL SIDE OF OPTICAL DISC  
After the learning step of an optical disc recording apparatus for writing a label side of an optical disc is accomplished, the focusing servo control signal includes an offset voltage component....
US20080080339 METHOD OF ACCESSING INFORMATION STORED IN PREDETERMINED DATA AREA ON OPTICAL DISC AND INFORMATION REPRODUCING APPARATUS THEREOF  
A method of accessing an optical disc is disclosed. The method includes: enabling a focus servo control without enabling a tracking servo control, and then moving an optical pick-up unit in a...
US20060083126 Methods and apparatuses of half-wave layer jump control for optical disk drive  
An apparatus for controlling half-wave layer jumping of a pickup head of an optical disk drive includes a half-wave layer jump controller and an output logic unit. The controller receives a focus...
US20070195654 Buffer control system for reducing buffer delay time between the playback of tracks and method thereof  
A buffer control system for generating a buffered signal having reduced buffer delay time between playback of tracks includes a controller module for providing an end target and for selection of a...
US20070195668 Apparatus and method for discrimination between optical record carriers of different formats  
Apparatus and method for discriminating in an optical drive between discs of different formats, in which the optical disc remains substantially stationary or is arranged to rotate at a very low...
US20050265205 Method for real-time adjustment of servo gain in an optical recording system according to reflected recording light beam  
An optical recording system includes an optical pickup, a power auto-control device, and a digital signal processor. The optical pickup includes a laser diode and a photo detector. The power...
US20070211585 System and method of adjusting channel properties for optical storage systems  
A method of adjusting channel properties of an optical storage system is disclosed to include the steps: Step 1) give a modify step, a trial step and a threshold, Step 2) give an initial point,...
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...
US20050265145 Disk drive and method of controlling position of the pickup  
An optical disk includes a label recording surface capable of recording a visible image using laser beam, and an information recording surface on which information is formed as marks on a track....

Matches 1 - 50 out of 83 1 2 >