Matches 51 - 100 out of 390 < 1 2 3 4 5 6 7 8 >
Match Document Document Title
7206264 Method for regulating the tracking of a scanning device and drive for the same  
A method is provided for regulating the tracking of a scanning device, for example, a read/write head, of a drive. A drive for storage media having a scanning device is also provided, permitting...
7190644 Track-locking method and apparatus for optical disk drive  
A track-locking method for an optical disk drive is conducted according to the following steps. First, a tracking error signal (TE signal) is detected, and then the time period for a pickup head...
7184374 Layer jump control device and method of high-speed optical drive  
A real-time wobble detector and an adaptive layer distance balancing calculator are added in a layer jump control device of a high-speed optical drive to solve failure and instability caused by the...
7170847 Means for limiting an output signal of an amplifier stage  
An electronic circuit is provided which can autonomously handle an input current (I i ) having a relatively wide dynamic range without being overdriven. The electronic circuit comprises an...
7164627 Optical pickup actuator circuit having coil protection feature  
An optical pickup actuator circuit includes: a lens holder 2 supported so as to be slidable along a support shaft and rotatable around the support shaft and for holding an objective lens 8 so...
7161880 Disk apparatus for projecting a laser beam onto a recording surface of a disk recording medium  
A disk apparatus ( 10 ) includes an optical lens ( 14 ). A seek operation is performed by moving the optical lens in a radius direction of a recording surface of a magnetooptical disk ( 40 ). When...
7145854 Recording layer determination apparatus for determining whether recording layer of recording medium is single-layer or multi-layer  
An objective lens of an optical pickup is made to move from far position to near position with respect to DVD with constant speed, and a timer counts time taken for the movement of a focus of a...
7145845 Optical disc player having a carriage control system relying upon a multiplied periodic signal and a tracking error signal  
For reproducing and/or recording information from/onto an optical disc, a pickup is used to detect a target track on the disc through an optical beam. In carriage servo control, movement of the...
7142485 Information storage apparatus  
The present invention provides an information storage apparatus that generates a tracking error signal based on a detection signal, and performs various control operations based on the tracking...
7126899 Optical recording medium processing device and focal point control method thereof  
The focus is moved from a first layer (L 0 ) to a second layer (L 1 ) of a double-layered optical disk by stopping a control loop operation and applying acceleration pulses for an interlayer jump...
7116609 Optical storage system and control method  
A reference-position learning unit measures a current of one rotation of a medium in a state in which the focus of an objective lens is pulled-in by a focus pull-in control unit at a predetermined...
7102967 Method and apparatus for tracking error detection in optical disk driver  
A method and apparatus for tracking error detection in an optical disk reproduction system. The tracking error detecting apparatus generates a tracking error signal as a difference signal of...
7099253 Method and apparatus for DVD recognition using inner and outer tracking error signals  
A DVD recognition method and apparatus is disclosed. First, a disc recognition apparatus uses a laser with a specific wavelength to irradiate an inner area of the DVD, thereby obtaining an inner TE...
7095683 Tracking and focus digital servo system with write abort  
A write abort algorithm of a tracking and focus servo system that can abort a write operation on an optical disk drive is presented. The write abort algorithm monitors at least one of a tracking...
7072263 Optical disc recording and playback apparatus  
A pickup control circuit ( 5 ) for performing a control operation of an optical pickup ( 3 ) and an error detection circuit ( 14 ) for detecting an error signal from a servo signal obtained from...
7054238 Signal shaping circuit  
The present invention relates to a signal shaping circuit which is capable of shaping a returning light signal of a modulated signal whose signal level and signal length are arbitrarily varied such...
7054250 Method and device for jitter enhancement in an optical disc system  
A method and device are provided for jitter enhancement in an optical disc system. The optical disc system generates a signal that includes an effective component having a first slew rate, and a...
7054237 Optical disk device  
An optical disk device for driving an optical disk having an emboss section and a data section comprises an optical pickup for replaying address information by irradiating a laser beam onto the...
7050366 Device and method for detecting non-writable region of optical recording medium  
Device and method for detecting a non-writable region of an optical recording medium, wherein a read channel 1 signal and a read channel 2 signal are sliced at respective slice levels to...
7035176 Method and device for timely outputting focusing completion signal to realize focusing condition of optical pickup head  
A method is provided for outputting a focusing completion signal to realize a focusing condition of an optical pickup head for an optical access apparatus. The method is described as follows. A...
7020053 Optical disc apparatus  
In an initial operation of an optical disc apparatus for reading out information data recorded in the innermost data recording area on the optical disc, a main processor judges whether periods...
7016269 Optical pickup apparatus and focusing control method  
An optical pickup apparatus having an irradiation optical system for condensing a light beam on a track of a recording plane and a photodetection optical system for guiding return light to a...
7012859 Method and apparatus for controlling reproduction of optical recording medium  
A method and apparatus for controlling reproduction of an optical recording medium is disclosed. According to the method and apparatus, a moving direction of an object lens on a disc is detected...
7009917 Layer jump control for an optical drive  
A layer jump control apparatus of an optical drive. The layer jump control apparatus has a pick up head, a preamplifier, a controller producing a focusing control signal FC, a low pass filter for...
7009918 Information storage apparatus  
The present invention provides an information storage apparatus that generates a tracking error signal based on a detection signal, and performs various control operations based on the tracking...
7006418 Optical disk device that monitors chip temperature of a drive and controls its operation based on the chip temperature  
Monitor circuits monitor junction temperatures of chips of driver ICs which drive a driving part of a recording/reproduction system. Comparison circuits compare the junction temperatures with...
7002880 Optical disk drive with adaptive compensator  
An optical disk drive for accessing data stored on a compact disc has a housing, a sled sliding inside the housing, a driving device for driving the sled, an actuator installed on the sled, a servo...
6977876 Apparatus for and method of detecting defocus error signal for optical pickup and apparatus for and method of detecting seek direction  
An apparatus for and a method of detecting a defocus error signal. First, second and third light receiving regions of a photodetector are arranged in a radial direction of a recording medium to...
6970410 Focus detection in a digital focus servo system  
A system for determining whether a focus servo system is in focus or out of focus (i.e. open) is disclosed. A sum signal can be compared with a threshold value. If the sum signal is below the...
6946633 Optical disc apparatus and method for controlling focus of the same  
A focus error signal which is a differential signal indicative of a difference between a sum of amounts of reflected light detected by photodetector elements A and C of a four-split photodetector,...
6947233 Disk drive apparatus and method for compensating for error in servo-information-recorded position between heads  
In a first mode, an R/W channel starts to monitor read information to thereby detect a servo mark contained in servo information, each time a servo controller generates a servo gate pulse. Upon...
6940788 Disc apparatus and a method for activating a focusing servo  
According to the method, the focusing servo is activated at the zero-crossing point of a focusing error signal FE immediately after the focusing error signal FE has exceeded the first threshold th...
6937543 Digital focus servo system with a sliding notch filter  
A notch filter that filters a focus error signal during a multi-track seek operation is presented. The notch filter has a center frequency that relates to the seek reference velocity of a...
6928034 Optical disc apparatus and method for adjusting a servo of same  
In an optical disc apparatus, a minimum jitter value is established from each jitter value measured in correspondence to a successively changed servo constant, and multiplied by a prescribed ratio...
6912184 Method and apparatus of measuring axial vibration of a disk recording medium  
The present invention relates to method and apparatus of measuring axial vibration of a rotating disk. The present axial vibration measuring method selects a plurality of equally-spaced...
6882602 Calibration method for control device of optical storage medium drive  
A calibration method for a control device of an optical storage medium drive includes generating a calibration-driving signal by a signal generator and then generating a sensing signal by a sensor...
6882600 Carriage servo control system and information-recording medium in which program for carriage servo control is recorded  
For reproducing information recorded on an optical disc, a pickup is used to detect a target track on the disc through an optical beam. In carriage servo control, movement of the pickup is...
6845066 Focus control method and focus controller  
The present invention aims to perform high-accuracy focus control in an optical disk drive, even if a solid immersion lens (SIL) or a solid immersion mirror (SIM) is set between an objective lens...
6845068 Optical disk apparatus and focus control method thereof  
In a focus control for following a focus position of light beam to be radiated to an optical disk to an optical disk surface, the technique is for shorten the memory length in the learning...
6842407 Method and apparatus for tracking servo system  
The present invention provides a method for guiding a pick-up head to follow an information track. The method comprises the steps of sensing and sending notification of displacement between the...
6839194 Disk drive apparatus and method for generating servo sector pulse  
A servo mark detector detects a servo mark from each servo information item detected by the servo detector. A counter measures a time period each time a servo mark is detected, thereby measuring a...
6798363 Method for compensating an offset in an asymmetric reproduction signal  
The present invention relates to a method for compensating asymmetry in a reproduction signal DRSO from an optical recording medium, and to an apparatus for reading from and/or writing to optical...
6791913 Optical recording apparatus, optical recording/reproducing method  
When an external disturbance that causes the corrected amount of light reflected from a glass master disk 15 to surpass a threshold value T 1 is applied to the control loop, not only the main...
6787748 High speed sampling circuit  
A light intensity control apparatus for use in an information recording and reading system includes a light source driving device for driving a light source so as to generate a light having the...
6777657 Focusing controller for focus jump control between recording layers of multilayer disk  
A focusing controller executes an appropriate focus jump even in a multilayer disk having layers of characteristics greatly different from each other. The focusing controller has an optical pickup...
6775208 Method for controlling focus speed of a pick-up head  
The present invention provides a method for controlling a focus speed of a pick-up head while performing a layer jump operation over a multi-layer optical disk in an optical information reproducing...
6760285 Disk device and method for adjusting servo mechanism  
Focusing balance adjustment of adjusting a servo mechanism is executed so that reproduction quality is optimum in a state where a focusing servo is active (#5). Thereafter, tracking balance...
6754144 Optical information recording/reproducing apparatus  
In an optical information recording/reproducing apparatus, in which two sets of circuits (including a comparator 104 and a time counting device 105 (i.e., pulse width detector), and a...
6744709 Focusing control apparatus, recording medium, and optical disk playback apparatus  
In advance of the playback of an optical disk 11 , the peaks of a focus error signal are detected, and the reference values of the focus error signal are set on the basis of the values of the...
6744705 Optical disc recording and reproducing apparatus  
An optical disc recording and reproducing apparatus is provided. The apparatus detects the level of a focus error signal output from an optical pickup and a peak of the focus error signal occurred...
Matches 51 - 100 out of 390 < 1 2 3 4 5 6 7 8 >