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7619952 |
Track calculation method for fixing track jumps of optical discs of different capacities
An appropriate track calculation equation is inducted according to a relationship between a storage area and a track pitch of a compact disc, and a pickup unit is instantly shifted to a location...
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7593293 |
Optical disk drive
An optical disk drive includes a pickup head, a servo circuit, and a controller. An optical disk has a first area and a second area for which different tracking methods are to be used. 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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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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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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7242642 |
High speed recording and reproducing for optical disk device of different format
In an optical disk high-speed replaying/recording apparatus, a first read data quality determining section determines a quality of read second units of digital data. Upon determination that the...
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7177237 |
Method of detecting orientation of optical disk drive
The present invention discloses a method of detecting orientation of an optical disk drive. Firstly, a first moving distance is measured by using a first force driven on a movable optical pick up...
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7012780 |
Disk drive and methods that calibrate micro actuator positioning before seek operations
A disk drive includes a data storage disk, a transducer, a micro actuator, a coarse actuator, and a controller. The micro actuator is configured to position the transducer relative to the disk over...
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6980489 |
INFORMATION RECORDING/REPRODUCING APPARATUS FOR RECORDING/REPRODUCING INFORMATION WITH RESPECT TO INFORMATION STORING MEDIUM WITH GUIDE TRACKS AND INFORMATION TRACKS, AND TRACKING METHOD USING THE INFORMATION STORING MEDIUM
A magnetic tape has a guide track for optically obtaining a tracking signal and an independent information track for storing information. The magnetic tape is partitioned into different kinds of...
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6917569 |
Method for determining seek times in a disk array storage device
Optimizing performance of physical disk drives in a disk array storage device with a plurality of logical volumes is accomplished by accumulating statistics over an interval to select two logical...
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6909675 |
Method for switching an optical disc apparatus to different accessing speeds
A method for switching an optical disc apparatus to different accessing speeds. The optical disc apparatus has a control button with which to eject a disc. The method comprises the steps of...
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6807132 |
Servo control method using information of a table of contents of a disk
The present invention relates to a method for servo-controlling when a reproduction is requested to a multi-session disk for non-real-time data or real-time data of audio or video stream. This...
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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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6804176 |
Apparatus and method for performing track search
Apparatus for providing fine search in a sled movement mechanism employing a stepping motor by controlling the speed with which the head jumps in succession to next neighboring tracts on a disc and...
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6785197 |
Control system and method for controlling the sled of the optical storage device by using stepping motor
A control system and method for controlling a sled of an optical storage device by using a stepping motor. The optical storage device includes a pick-up head having a lens and a sled. The control...
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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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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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6693856 |
MAGNETO-OPTICAL DISK APPARATUS CAPABLE OF ACCURATE REPRODUCTION OF SIGNAL BY REMOVING MAGNETIC INFLUENCE BY MAGNET INCLUDED IN OPTICAL HEAD AND METHOD OF DETECTING INTENSITY OF MAGNETIC FIELD APPLIED BY MAGNET
A magneto-optical disk apparatus includes a magnetic head in a position opposed to an objective lens included in an optical head with a magneto-optical record medium therebetween. The...
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6680880 |
Apparatus for reproducing information from data-carrying disks
CD playback apparatus for reproducing information from unfinalized CD-R disks which have no index information stored in a table of contents (TOC) area which scans a disk coarsely to detect the end...
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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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6603714 |
Reproduction apparatus for double-sided recording media
The invention relates to an apparatus for reproduction of double-sided recording media without any reversal of the direction of rotation or changing or turning over of the recording medium. A...
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6600699 |
Apparatus for searching of recorded information
To provide a disk unit wherein a prompt search is enabled even if the recorded time of one track is long, if the total recorded time of one track is below five minutes, a search mode is set to a...
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6584048 |
Focus jump device for reproducing information from a storage medium
A focus jump moves a focus position of a light beam in a direction perpendicular to the storage medium to the focus position corresponding to a target recording layer so that the light beam is...
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6560170 |
Track search control apparatus, track search control method, data recording apparatus, data reproduction apparatus and data recording medium
When controlling a search for a target track on an optical disk having tracks on which data are recorded, the track-search control apparatus determines whether or not the optical disk is a DVD-RW...
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6487145 |
Method and system for audio data collection and management
A method is provided for extracting music data from a compact disc and managing the music data. The method is configured to have the system extract at least a portion of an initial track of music...
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6341103 |
Optical disk apparatus capable of correcting the drive current waveforms of stepping motor
A slide-feed drive part ( 27 ) uses a stepping motor as a slide-feed motor for changing the position of a optical pick-up ( 3 ) with respect to the rotation surface of an optical disk ( 1 ), and...
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6130865 |
Apparatus and method for positioning an optical head over a disk having spiral tracks with encoded address information
An apparatus and method are provided for moving an optical head to a desired track on a disk shaped recording medium having a pair of spiral tracks. A common address is recorded on the pair of...
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RE36864 |
Optical disk drive and methods for counting the number of tracks on an optical disk
The invention is a positive peak level comparator for generating a positive peak pulse when a TES (Tracking Error Signal) is higher than a predetermined positive level, a negative peak level...
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6108281 |
Accessing control for optical recording device capable of performing time search
The record information (42, 43, 44) and the access information (51: DSI) are recorded on a record track (1a) of an information record medium (1: DVD) such that the record information and the access...
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6104681 |
Disk apparatus
In the disk apparatus of the present invention, a head unit records and/or reproduces information on the disk while the disk is rotating. An actuator activates a positioning of the head at target...
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5966352 |
Information recording medium with interleaved data, apparatus for recording same and apparatus for reproducing same
An information recording medium includes a plurality of first information pieces each of which is reproduced successively in time by a reproducing apparatus; a plurality of second information...
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5956299 |
Method and apparatus for reading out data from a recording medium
A playback apparatus prevents the position of a pick-up from deviating to a location outside a data area of a record medium. A system controller judges whether the number of tracks T to be skipped...
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5953292 |
Rapid data reproduction method and apparatus for optical disk
A data reproduction method and apparatus reads the tracks of an optical disk by means of a read unit having a plurality of optical beams. The method includes a first reproduction step for...
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5920527 |
Apparatus and method for accessing multiple recording layers of a disk
When reproducing a disk having a plurality of recording layers read from one face, the reading out position is refocused from the current track position in a current recording layer to the target...
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5920526 |
Method for detecting a boundary between recorded and unrecorded areas on an optical disc
An optical disc recording device is disclosed in which RF signals reproduced from a write-once optical disc are detected during track jump for detecting the boundary between a recorded area and an...
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5875161 |
Method and apparatus for accessing track on an optical disc
A method for accessing track on an optical disc, comprising steps of implementing a preliminary track jump by a light pickup of a certain number of tracks from a present block on the optical disc;...
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5870356 |
Optical storage apparatus which detects a lens position signal without a lens position sensor
When a pull-in to a target track due to a turn-on of a tracking servo unit fails and a seek error is detected, a seek error processing unit turns on, for example, a low speed lens lock control unit...
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5808982 |
Disk calibration and search method in a CD-ROM drive system
A disk calibration and search method in a disk drive is provided, in which, after an initialization step, a pickup is jumped to a first position and moved radially in a predetermined direction in...
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5808975 |
Optical storage apparatus
A bias current measuring unit measures a drive current which is supplied to a VCM when a carriage is moved to a plurality of measurement positions and held as a bias current to remove a mechanical...
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5781516 |
Multiplane optical disc apparatus and access control method thereof
The present invention is intended to provide a multiplane optical disc apparatus for conducting high-speed information access from a track on one plane to a track on a different plane. The...
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5781515 |
Disk information reproduction apparatus and method using avoid band control signals
A method and an apparatus for disk reproduction are disclosed, in which information associated with an audio band signal for controlling the reproduction operation of the disk reproduction...
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5751673 |
Quick response optical disk system providing accurate displacement of a pick-up and method therefor
A quick-response optical disk system corrects signals from photodiodes through a differential amplifier to a tracking error signal TE that is further converted to a tracking drive signal TRD and a...
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5682362 |
Track accessing method and apparatus using coarse and fine driving control in collaborating of fashion
The invention is directed at ensuring stable track accessing despite the presence of backlash in a pickup drive mechanism, and at providing a precise track accessing operation not affected by the...
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5675563 |
Track access method and apparatus therefor
A method of track access is provided which, when there is a large offset in the neutral position of a focusing lens, achieves stable tracking servo operation and prevents a slowing down of access...
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5675558 |
Seeking control apparatus and method for disk drives, using slew-rate limit for control output
The purpose of the present invention is to provide a method and an apparatus for seeking-control for disk drives, in which (i) the step current waveform at the start of speedup or at the switching...
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5661705 |
Optical disk pickup control apparatus and method providing stabilized search operations
An optical disk drive is provided with a microcomputer for calculating the number of tracks on an optical disk traversed by an optical pickup in a seek operation and the number of steps to be taken...
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5623460 |
Circuit and method for searching track on CD
A track search circuit includes a command decoder which decodes command data sent by a microcomputer and stored in a command register and outputs signals commanding a track jump and commanding...
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5604722 |
Access control method and device of disk unit
In an access control method, a light spot is formed on a disk and a track-crossing signal is detected from light reflected on the disk when the light spot crosses a track of the disk. A moving...
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