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7391682 |
Optical disk system with improved signal regulation capability
A system, method, computer program and apparatus for providing regulating signals for regulating the position of an objective lens relative to a track on a disk. The regulating signals are obtained...
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7382697 |
Optical disk apparatus
A seek control unit increments by a first magnitude the maximum speed when the pickup head is moved while the number of jumped tracks can be counted appropriately. If the number of tracks jumped...
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7372025 |
Scanning probe microscope using a surface drive actuator to position the scanning tip
A scanning probe microscope includes a scanning probe tip and an electrostatic surface actuator operatively coupled to the scanning probe tip. The electrostatic surface actuator includes a movable...
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7369000 |
Adaptive frequency detector of phase locked loop
An adaptive frequency detector used in a phase locked loop for detecting a frequency difference between an input signal and an output clock generated from an oscillator of the phase locked loop...
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7345966 |
Method and apparatus for achieving a short seek with a stepping motor
A method for controlling a stepping motor in an optical storage system and for achieving a short seek with the stepping motor is disclosed. The optical storage system comprises a pick-up head and...
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7345965 |
Method for track counting and corresponding apparatus for reading from and/or writing to an optical recording medium
In an apparatus for reading from and/or writing to an optical recording medium, it is desirable, in particular in the case of track jumps, to detect the direction of the track jump, i.e. the...
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7342852 |
Method and apparatus for differing focus between at least two dimensions
The present invention obtains a more optimal focus in at least two dimensions (such as axial and radial dimensions) by setting or keeping a focus in at least a first dimension (such as both axial...
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7336568 |
Method and apparatus for long seeking control in an optical disc drive
A method for controlling long seeking operation in an optical disc drive is provided. The optical disc drive includes a sled actuator, a pickup head installed on the sled actuator for reading...
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7336566 |
Method and apparatus for track type identification, and method of track jump
The track jumping of a scanner on optical storage media in which information items are stored on groove and land tracks or which have not yet been written to is intended to be made possible in a...
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7315492 |
Header mask signal generating track jump method for a recording medium
A track jump method for an optical recording/reproducing medium is provided. In the track jump method, once a track jump command is input, a track jump operation is held until a falling edge of a...
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7315491 |
Disk driving apparatus and information readout method with selective servo control for read-out destinations of lands and grooves
A disc driving apparatus and an information readout method according to the present invention realize optimum servo control of a readout unit in reading out the information from a recording medium...
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7304918 |
Servo error signal generation circuit and servo error signal generation method
A servo error signal generation circuit comprises a first sampling unit for sampling first detection signals at first sampling timings, a second sampling unit for sampling second detection signals...
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7289411 |
Optical disc apparatus
The present invention provides an optical disc apparatus capable of rotating an optical disc with high speed while enabling reduced current consumption. The optical disc apparatus comprises a...
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7289399 |
Tracking error detection apparatus including reduction in false tracking error detection during phase error detection
A tracking error detection apparatus comprises a photodetector comprising plural photoreceptor elements; zerocross detection circuits for detecting zerocross points at which two sequences of...
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7289398 |
Optical disk apparatus and method for tracking thereof
An optical disk apparatus and method having a pick-up part for emitting a light onto a recording surface of an optical disk and receiving the light reflected from the recording surface of optical...
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7274640 |
Apparatus and method for determining disc type
A disc type determining apparatus in a disc recording and reproducing apparatus in which vibrations generated by rotations of a disc occur in a focus and tracking control actuator includes an error...
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7260031 |
Digital focus and tracking servo system with one-track jump
A tracking and servo system with a one-track jump is disclosed. The one track jump algorithm holds a control signal from the tracking servo system. The one track jump algorithm adds an acceleration...
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7251087 |
Lens driving apparatus and image pick-up apparatus including the same
An image entering from the left side of the figure passes through a correcting lens unit, and forms an image on an image pickup device on the right side of the figure. The correcting lens unit...
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7239587 |
Approximating topology of optical disc surface
A method of one embodiment of the invention is disclosed that outputs an oscillating wave towards a surface of an optical disc. A proximity signal is detected in response to the oscillating wave...
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7221627 |
Optical device for reading information
An optical playback or recording device is equipped with mass-unbalance detection means ( 20 ) for detecting unbalance on the record carrier ( 2 ). Mass-unbalance causes vibration and sound in the...
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7218582 |
Optical disc drive
An optical disc drive is used to read and/or write data from/on an optical disc having a data storage layer. The drive corrects electrical offset while reading and/or writing data. The drive...
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7218579 |
Long seek control device for optical disk drive and method thereof
A optical disk drive long distance seek control device and method thereof, capable of feeding back the optical head control device through the step motor control device during the long distance...
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7212472 |
Focus point switching
A focus jump technique enables focus control on recording layers of a disc in such a manner that its effect is not absorbed by disturbance or a variation in the movement speed of an objective lens....
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7206263 |
Method for position control in optical data carriers with address information
Track jumping on optical storage media whose address information items invalidate the track error signal at time intervals is intended to be configured more securely and more reliably. For this...
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7196980 |
Information disk recording/reproducing device and method for controlling recording/reproducing speed thereof
Information about the number of traversed tracks is acquired with a code at a first rotational speed and a second rotational speed in each area provided by dividing one rotation into m (m is a...
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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...
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7180835 |
Data access method for improving performance of an optical disk drive
A data access method for improving performance of an optical disk drive is applied on a predetermined data access operation. A predetermined application program and the optical disk drive are used...
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7164628 |
Optical disk device
An optical disk device in which data is written to or reproduced from an optical disk having an area which contains a header section and another area which does not contain a header section. When a...
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7154821 |
Compensation method for detecting the seeking speed of an optical disk drive
A compensation method for detecting the seeking speed of an optical disk drive involves the following steps. First, a TE signal is converted into a TEZC signal, or an RFRP signal is converted into...
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7145849 |
Method to reduce the offset component of tracking error in an optical disc player
A method of tracking error correction, primarily for utilization in optical disc drives using single beam optical pick-up heads. Delinearization in the tracking servo of a single beam optical...
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7145838 |
Method and apparatus for performing target search on optical storage disc
An optical storage disc stores storage information and includes track information. A method for performing a target search on the optical storage disc includes: generating a first intermediate...
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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...
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7136339 |
Positioning control apparatus and method capable of reducing relative position error without increasing gain and frequency band of transfer characteristics of control system
A positioning control apparatus for controlling a moving member to trace the position of a target member which almost equally repeats the position shift at a predetermined period comprises a...
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7126890 |
Multitrack readback and multiuser detection for disk drives
Techniques for reading data from a storage medium ( 150 ) having a high track density prone to adjacent track interference are disclosed. One or more sensing elements ( 120 ) are used to extract...
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7126889 |
Tracking error detector
A circuit to improve the SN characteristic of a tracking error signal. This tracking error detection circuit is formed as a push-pull system utilizing a quadrant type photo-detector and provided...
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7120095 |
Apparatus for generating seek direction detecting signal using track error and track cross signals for an optical pickup
An apparatus to generate a seek direction detecting signal for an optical pickup to determine a position of a center of an optical spot focused on an optical disk relative to a center of a track,...
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7120094 |
Device for reading and/or writing information from/onto an optical information carrier
A device for reading and/or writing information from an optical carrier, the device comprising an imager for imaging a radiation beam into scanning spot to scan the carrier, and a detector for...
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7116610 |
Optical disk device and tilt correction method
An optical disk device and a tilt correction method capable of high precision tilt correction with a smaller number of measurement positions are provided. Prior to data recording and reproduction,...
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7110331 |
Information storage device
An information storage device having a uniaxial tracking mechanism as a pickup which can perform a stable track pull-in operation is provided. A deceleration pulse amplitude รก supplied to a...
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7106670 |
Method and apparatus for long seeking control of pickup head
A method for long seeking control of an optical read/write head is disclosed. The optical read/write head includes a sled moved by a sled motor, and a lens mounted on the sled and moved by a lens...
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7095685 |
System and method for detecting and recovering from an off-format state in an optical disc drive
A disc drive includes a tracking actuator, and determines when the tracking actuator is positioned off a formatted portion of optical media in the disc drive. The optical media includes a pitted...
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7088646 |
Track search control circuit and optical disc drive
Disclosed is a track-search control circuit for performing track-search of an optical disc stably even at the time of multi-speed reproduction of the optical disc. The track search control circuit...
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7084895 |
Multiple passes over tracks of and radially non-collinear track starting positions on label side of optical disc
A method for labeling an optically writable label side of an optical disc of one embodiment of the invention is disclosed which includes at least one of the following. First, the method may...
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7065023 |
Light spot advancing direction judging device and method, optical head device control device and method, and optical disk recording/reproducing device
A device and a method for judging the radial moving direction of light spots formed on the signal recording surface of an optical disc having grooves of two types, which are different from each...
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7065011 |
Method for adjusting mechanical error of optical disc reading device
The present invention provides a method for adjusting the mechanical error of an optical disc reading device. The optical disc reading device consists of a driving device and an optical pickup. The...
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7065010 |
Method for tracking in an optical recording/reading apparatus, and corresponding apparatus
Method for tracking in an apparatus for reading from and/or writing to an optical recording medium, and corresponding apparatus for reading from and/or writing to an optical recording medium. In...
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7046592 |
Optical disk reproducing apparatus
When a run-away phenomenon of an optical disk occurs, a control circuit detects a rotational direction of the optical disk that runs away by comparing an initial track count value and a braking...
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7046591 |
Track traverse counting on an optical disk
An apparatus detects the number of tracks traversed on an optical disk. The apparatus includes a differentiation part for differentiating an output signal of a bandpass filter provided on an...
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7038979 |
Method and apparatus for a high-speed search of an optical medium
An apparatus and method for high-speed searching of an optical medium having a plurality of tracks. Light spots are directed by the apparatus onto the optical medium. As the spots traverse across...
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7035187 |
Apparatus and method for generating RFZC signal for optical systems
An apparatus and related operating method for generating slice levels adapted to an optical system is disclosed. The apparatus basically encompasses a multiplexer, a low-pass filter, a digital...
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