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Match Document Document Title
7301859 Track error detection device having a function of removing a phase offset, and phase offset removing method thereof  
A track error detection device that removes a phase offset and a phase offset removing method thereof removes an error signal generated by device circuit errors. The device includes an equalizing...
7295501 Apparatus and method for controlling a focus jump and level thereof in a multilayer optical disk  
A focus control is performed on the basis of a focus error signal indicative of a deviation amount from a focus state in a recording layer of a laser beam emitted for reproducing information to an...
7295498 Disk apparatus and method of generating a tracking error signal  
Comparators compare the amplitudes of a DPD tracking error signal indicating the phase difference between the detection signals supplied from a photodetector, and a PP tracking error signal...
7289405 Apparatus and method for detecting optical disc type and/or adjusting track balance  
Provided are an apparatus and method for detecting a type of an optical disc inserted into an optical disc system and/or adjusting a track balance in the optical disc system by detecting voltages...
7289396 Disk device  
A driver IC 1 has a bias terminal 20 a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20 b via which a bias...
7283432 Method and device for correcting optical path deviation of an optical pickup in an optical recording system  
A device for correcting optical path deviation of an optical pickup in an optical recording system includes a push-pull signal generator for generating a push-pull signal while the optical pickup...
7280445 Optical pick-up  
A finite optical system that a laser beam from a light source is allowed to be directly incident on an objective lens without passing a collimate lens is employed. The reference position of the...
7280444 Objective optical element, optical pickup device, and optical information recording and reproducing device  
An objective optical element to be used for an optical pickup device for performing reproducing and/or recording of information to a first optical information recording medium and a second optical...
7276680 Control unit and optical disk drive including the control unit  
An information processing apparatus includes: a converging section for converging light; a shifting section for shifting the focus of the light by moving the converging section perpendicularly to...
7266056 Method of focus position adjustment by controlling a deviation value and system thereof  
The present invention provides a focus position adjustment method for adjusting a focus position by which an optical storage device reads an optical storage medium. The optical storage medium...
7257053 Optical disc apparatus  
An optical disk apparatus having a high reliability by evading collision between a condensing lens and an optical disk regardless whether the focus control is in the operative state or in the...
7257052 Control apparatus and optical disk apparatus  
A tracking control apparatus comprises an signal processing section, a lens characteristic measuring section and an optimum lens position searching section. The lens characteristic measuring...
7254099 Method and related apparatus for deriving a tracking error signal  
A method for deriving a tracking error signal based on a first analog detection signal and a second analog detection signal. The method includes summing the first analog detection signal and the...
7242646 Track locking method for optical disk drive and apparatus  
A track locking method and an apparatus thereof enable an optical disk drive to rapidly and stably read data recorded on a target track from a seeking mode to a track locking mode. An optical...
7212473 Method and device for adjusting focus bias in optical disc apparatus  
A method and device are provided for adjusting a focus bias of an objective lens of an optical pickup for an optical disc using a level of a tracking error signal. The level of the tracking error...
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...
7187629 Method and related apparatus for deriving a tracking error signal  
A method for deriving a tracking error signal based on a first analog detection signal and a second analog detection signal. The method includes summing the first analog detection signal and the...
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...
7075878 Optical disk device and information recording/reproducing method  
An optical disk device is provided with an optical pickup that includes a convergent optical system having an objective lens for converging a light beam emitted from the laser light source to form...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
Matches 1 - 50 out of 388 1 2 3 4 5 6 7 8 >