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7623417 |
Optical disk device
In an optical pickup driving mechanism using a stepping motor, a feeding operation of an optical pickup can be stabilized even in a broad operating temperature environment. In executing an optical...
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7573786 |
Optical disk apparatus and rotation speed control method thereof
An optical disk apparatus is disclosed which can suppress excessive reduction of recording speed on the inner side of a disk and that can assure quick response of accessing operation. When, at the...
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7545707 |
Optical disc drive
The present invention relates to optical disc drives including a carriage which is movable radially of an optical disc and an objective lens which is supported on the carriage movably in radial...
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7522480 |
Digital tracking servo system with multi-track seek with an acceleration clamp
A servo system with a multi-track seek algorithm with an acceleration clamp is presented. The multi-track seek algorithm detects zero crossings in a tracking error signal, counts the number of zero...
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7420348 |
Drive apparatus
Optical disc drives designed for reduced power consumption switch the supply voltage in three stages between first, second, and third power supplies. The reduction in power consumption that is...
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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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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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7280447 |
Method and apparatus for slip protection of DVD-RAM drive's seek control
The present invention is provides a method and apparatus for slip protection of DVD-RAM drive's seek control, comprising a slip end velocity controller, a re-seek controller, and a slip detector....
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7230886 |
Speed error compensation method for optical storage device
The present invention discloses a system for speed error compensation. A predetermined speed signal subtracts a feedback speed signal to generate a speed error signal, and a microprocessor receives...
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7196977 |
Track jump control circuit for accessing optical disk drive
In track jumping operation, an acceleration/deceleration pulse generation portion measures the TE signal amplitude during track jumping, and modifies the acceleration/deceleration time of the...
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7177238 |
Method and related apparatus for adapting rotation speed adjustments of a motor via a pause mode while accessing data from an optical disc
A method and related apparatus for data accessing of an optical disk drive. The optical disk drive has a motor for rotating an optical disk and a pickup head. The pickup head is capable of writing...
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7167421 |
Method for controlling optical pickup head upon switching from following mode to seeking mode
A method for controlling an optical pickup head of an optical processing apparatus is provided. A first lead-lag compensator is disabled and a second lead-lag compensator is enabled when the...
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7136329 |
Method and apparatus for canceling glitch noise from track crossing signal
Provided are a method and apparatus for canceling noise from a track cross signal, a method for controlling an optical disc drive, an optical disc drive, and an optical disc reproducing apparatus....
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7116607 |
Apparatus and method of removing disturbances during optical recording and/or reproducing
An apparatus to remove periodic disturbances in a recording medium having large eccentricity and deflection mass includes an actuator to change a position of a pickup in response to a combination...
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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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7042812 |
Method and apparatus for canceling glitch noise from track cross signal
A method and apparatus for canceling noise from track cross signal includes binarizing the track cross signal with reference to at least two reference values, and removing noise from the binarized...
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7020050 |
Position control of opticial head in a recording device
A data player or a method in which a reading and/or writing head is positioned according to anyone of 3 methods or combinations thereof: Calculating a desirable speed curve to position the head...
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6990048 |
Track jump control apparatus and track jump method
A disk apparatus includes a DSP (digital signal processor), and the DSP controls respective circuit components under instructions of a MCU. During a track jump, a DSP core detects a zero-cross...
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6973013 |
Track jump apparatus capable of varying moving pulse and braking pulse
A disk drive apparatus is disclosed for stabilizing a track jumping operation of an objective lens. The disk drive apparatus includes a detection section for detecting the direction that object...
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6937546 |
Optical disk device with improved track jump features
An optical disk device starts movement of a thread in a track-on state, and releases the track-on state when the thread moves by a certain amount, and gives a driving kick signal to an actuator....
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6922377 |
Recorded disk reproducing device capable of adjusting control voltages
A CPU compares a detected moving speed with a previously set reference moving speed and when the detected moving speed is smaller than the reference moving speed, controls to increase a motor...
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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...
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6879549 |
Brake circuit for three-beam optical tracking system
A brake signal generating circuit and method for improving the efficiency of a lens brake in an optical disc reproducing system are provided. The brake signal generating circuit includes: a brake...
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6873577 |
Optical head position control for optical recording device
a data player or a method in which a reading and/or writing head is positioned according to anyone of 3 methods or combinations thereof: Calculating a desirable speed curve to position the head...
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6873578 |
Adaptive brake force setting system in an optical recording device
The invention provides an adaptive brake force setting system. Every time when a pickup head with a predetermined mass crosses a plurality of recording tracks in an optical recording media, the...
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6859422 |
Tracking access control method and device for optical storage medium drive
A tracking access control method for an optical storage medium drive is used for reading data stored in an optical storage medium. The optical storage medium drive has a sled capable of sliding in...
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6845065 |
Magneto-optical recording medium processing apparatus
A magneto-optical recording medium processing apparatus of the present invention limits, via a predetermined current limiting means, the bias current applied to a bias coil during seek, when a seek...
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6834028 |
Optical disk device capable of performing high speed seeking time
The present invention provides an optical disk device that reduces a track lead-in time associated with a seek time. A switching means 50 includes a multiplier A 11 for multiplying an output of...
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6804177 |
Apparatus selecting different position signals at different scanning velocities to determine displacement of record carrier scanning
In a scanning apparatus, a scanning spot is moved along a path from one track to another track of the information carrier, the scanning spot is accelerated in a first stage of the movement and...
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6801480 |
Optical disk drive apparatus capable of braking the optical head at half track short of target track
When a lens 4 a reaches a position which is a half track short of an objective track in a track jump, a servo processor 7 conducts a braking operation of an amount corresponding to the movement...
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6744702 |
Apparatus for accessing recording disk by controlling the coarse and precise actuators
A disk apparatus comprising a precise positioning mechanism for finely displacing the information recording/reproducing mechanism in a radial direction of the disk, a coarse positioning mechanism...
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6741529 |
Method and apparatus for moving carriage assembly from initial position to target position and optical disc system including same
An apparatus and method for moving a carriage assembly from an initial position to a target position relative to a storage medium rotating at a circumferential velocity. A processor determines a...
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6738320 |
System and method for moving optical pick up from current position to target position with smooth control
A method of changing the position of a component controlled by a servo system is disclosed. In accordance with the disclosed invention, the current position and the current control signal...
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6724695 |
Method for accessing optical disk by detecting the different between moving command and actually moving
A disc playback apparatus incorporating a memory that stores data concerning errors or differences between commanded number of tracks to be traversed and the number of tracks actually traversed by...
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6721239 |
Optical disc device
An optical disc device with high reliability, which is capable of performing a stable track jumping, is provided. In the optical disc device, a space (time interval) between an address part and the...
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6680881 |
Method for deciding the direction of pick-up head of disk driver while crossing tracks
A method for determining a track-cross direction of a pick-up head of an optical disk drive includes the following steps. (1) When a track-cross velocity of the pick-up head was determined to be...
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6636466 |
Method for track seeking of a reading head in an optic disk drive
A method for track seeking of a reading head in an optic disk drive is disclosed. In seeking a track in a disk. the track number and the direction in the fine seek are used for adjusting a voltage...
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6628576 |
Storage apparatus having device for controlling track jump of a positioner
A track jump control unit adds an FF signal for repetitive disturbance compensation obtained by a learning control which is used in a track-following control and a final value of an FB control low...
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6606283 |
Long seeking method used in an optical disk drive
A long seeking method, used in an optical disc drive, includes identifying the position of the pick-up head, applying a first driving force on the pick-up head in addition to the velocity control...
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6606282 |
Long seek control system and method in an optical storage device
The long seek control system and method include a reference velocity mapping unit that obtains a reference velocity when the dual actuator is moved by the residual track count; a velocity estimator...
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6535466 |
Apparatus and method for accessing data tracks on an optical disk
The method and apparatus for accessing data tracks calculate a reproduction speed of a target location based on a current rotation speed, adjust the speed of a data reading clock to the calculated...
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6504804 |
Moving body position detecting method and disc drive apparatus
A plurality of periodical signals are generated as the moving body moves. The periodical signals are given respective fundamental values. The fundamental value of one of the periodical signals that...
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6493292 |
Device for scanning an information carrier and method of operating such a device
A device according to the invention is suitable for scanning an information carrier with tracks around an axis. The device has means for transferring information to/from a scanning spot on the...
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6445650 |
High-speed dynamic actuating system for optical disks
Disclosed is a high-speed dynamic actuating system for optical disks, particularly useful in an optical disk drive, wherein a closed-loop approach is used to overcome the diversity between devices...
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6327229 |
Storage device and its seek control method
A seek control unit divides a seek control section into four segments, i.e., an acceleration segment, a maximum constant-velocity segment, a deceleration segment and a minimum constant-velocity...
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6320825 |
Method and apparatus for recording compressed variable bitrate audio information
A method for recording audio information on a record carrier, typically a bitstream signal on an optical disc, is disclosed. In the method the audio information is encoded to compressed audio data...
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6088314 |
Disc reading apparatus using optical pick-up
A disc reading apparatus includes a microcomputer. The microcomputer calculates, based on amount data, an outer radius (RM) of an area that is recording data. The reading speed on the determined...
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6055219 |
Method of switching the motor operation of an optical disc drive between the constant linear velocity mode and the constant angular velocity mode
A method is provided for use on an optical disc drive, which can automatically detect the current radial position of the pickup head to thereby switch the motor operation between the CLV (constant...
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RE36590 |
Apparatus and method for accurately scanning a light beam across tracks of a recording medium
A lens is accelerated on a coarse tracking carriage while enabling a lens position servo, which moves the carriage so that the lens returns to a neutral position on the carriage. After the beam...
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5901121 |
Optical storage apparatus having improved eccentricity correction abilities
When an access of a 1-track seek is instructed from an upper apparatus, a 1-track seek period is divided into predetermined accelerating period and decelerating period. A decelerating current is...
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