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8090906 |
Dynamic processor bandwidth allocation in response to environmental conditions
Servo-related tasks are performed at a first processor in a disk drive. A signal indicative of an environmental condition is received at the first processor, and code associated with the...
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7965589 |
Recordable disc and motor
A device comprises a recordable disc, a substrate adjacent to the recordable disc, and an actuation mechanism fixed to the substrate. The recordable disc includes a base layer and a recordable...
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7767255 |
Information storage medium with laterally magnetised dot array, and process for producing said medium
An information storage medium with an array of laterally magnetised dots, as well as a process for producing this medium is disclosed. Each dot (2) contains at least one magnetic domain formed by a...
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7598499 |
Charged-particle exposure apparatus
In a particle-beam projection processing apparatus a target (41) is irradiated by means of a beam (pb) of energetic electrically charged particles, using a projection system (103) to image a...
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7546003 |
Suspension board with circuit and producing method thereof
A suspension board with circuit includes a metal supporting board, an insulating base layer formed on the metal supporting board, a conductive pattern formed on the insulating base layer, an...
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7420895 |
Signal detection method and apparatus and optical recording and/or reproducing apparatus using the same
A method and apparatus for detecting a signal to determine on-track/off-track and/or a track cross direction, using a detection signal corresponding to a reflected main light beam and detection...
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7421359 |
Detecting back electromotive force voltage
A Bemf detect circuit is configured for modeling Bemf error via calculation of time correlations associated with two or more different non-calibrated sense resistor gain values to derive a...
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RE40413 |
Method and apparatus for developing a dynamic servo signal from data
Apparatus using information about the extent of errors in sensed data for performing as a control function at least one of adjusting the position of a magnetic head to improve alignment relative to...
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7319224 |
Semiconductor probe with resistive tip and method of fabricating the same
Provided are a semiconductor probe with a resistive tip, and a method of fabricating the semiconductor probe. The method includes forming a stripe-shaped mask layer on a substrate doped with a...
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7317206 |
Conductive elements for thin film transistors used in a flat panel display
Provided is a structure for conductive members in a TFT display. The structure is aluminum based and is heat treated. When heat treated, no hillocks are formed because of the presence of a titanium...
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7301690 |
Micro-optical arrangement
The invention relates to a micro-optical arrangement with which in particular optical properties of an optical element or its influencing of electromagnetic radiation may be changed. Thereby the...
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7254525 |
Method and apparatus for automated analysis of hard disk drive performance
A method and apparatus is provided which reduces the equipment and time requirements for hard disk drive performance testing during manufacturing. This invention executes self-contained performance...
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7206106 |
Holographic ROM reader having servo control
A holographic ROM reader having a servo control is disclosed. The holographic ROM reader includes an objective lens for focusing light reflected from a storage medium, a pinhole plate provided with...
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7009791 |
Position detecting method, information recording/reproducing device and information recording medium
A position information signal pattern is recorded into a recording medium. The position information signal pattern is configured by arranging graphics having a circular shape, a rectangular shape...
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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...
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6873492 |
Magnetic media with readable topographical features in combination with a slider-mounted non-magnetic transducer
Magnetic patterned media comprise topographical features readable with a slider-mounted non-magnetic transducer sensitive primarily to a local aerodynamic boundary condition, in addition to a...
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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...
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6762402 |
Apparatus for recording and reading data and method of recording and reading data using contact resistance measurement thereof
An apparatus for recording and reading data by measuring contact resistance and a method for recording and reading data thereof are provided. The apparatus for recording and reading data includes a...
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6680884 |
Apparatus and method for scanning a rotating information carrier
Apparatus for scanning a rotating information carrier having mutually substantially parallel tracks for the recording of information. The apparatus includes a transducer for scanning the...
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6564009 |
Apparatus for recording and/or reproducing data onto and/or from an optical disk and method thereof
An optical disk apparatus for recording and/or reproducing user data onto and/or from an optical disk. The apparatus includes an optical head for irradiating a laser beam having a wavelength of...
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6525897 |
Apparatus for developing a dynamic servo signal from data in a magnetic disc drive and method
Apparatus using information about the extent of errors in sensed data for performing as a control function at least one of adjusting the position of a magnetic head to improve alignment relative to...
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6459940 |
Closed-loop compensation for kinematic error in harmonic driver for precision control applications
Nonlinear control algorithms to compensate for kinematic error in harmonic drives provide a solid basis to improve their performance of harmonic drives in precision positioning applications. The...
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6452990 |
Synchronous detection of wide bi-phase coded servo information for disk drive
A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in...
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6421307 |
Optical device
An optical device having an irradiated portion formed of an optical recording medium in which a pit is formed on a reflection surface, a semiconductor unit in which a semiconductor laser, a...
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6388413 |
Head switch seek on disc drives with multiple recording heads
A disc drive includes a base and a disc rotatably attached to the base. The disc drive also includes an actuator assembly rotatably attached to said base and a device for moving the actuator...
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6353397 |
Method and device for switching between different types of output signals of a position measuring system
A method and a device for switching between different types of output signals, wherein it is possible to generate at least two different types of output signals by the position measuring system...
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6307689 |
Optical head and drive device for optical recording medium
An optical head (1) having an optical means for focusing a laser beam to irradiate an optical recording medium (51) is equipped with an objective lens (2) focusing a laser beam L, and a solid...
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6236032 |
Tracking pull-in circuit for reducing effect by a defect in a tracking servo loop
The object of the present invention is to provide a tracking pull-in circuit for reducing effect by a defect and enabling securely and promptly pulling in a tracking servo loop. To achieve the...
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6218086 |
Method of forming ultrasmall structures and apparatus therefor
The present invention discloses a method of forming ultrasmall (nano) structures in a thin film provided on a substrate by means of a tip which is movable relative to the surface of the thin film....
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6137753 |
Runout calibration for disc drive system
The invention provides methods and apparatus for compensating for disc runout. In an exemplary embodiment, a data-storage device is provided which includes a rotatable disc and a data head for...
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6088662 |
Thermoelectric temperature sensing system in a computer hard disc drive
A temperature sensing system for use in a computer disc drive comprises a themoelectric sensor having an output sensor voltage which is variable as a function of temperature, an interface circuit...
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6043768 |
Device and method for switching between different operating modes of a transducer
A device and method for data transmission between a transducer and a processing unit which are coupled by one or several signal transmission lines, to selectively activate at least two different...
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5953513 |
Recording and reproducing device for recording and reproducing information from different kinds of storage media having different sector formats
The recording and reproducing apparatus comprises an Small Computer System Interface (SCSI) controller, an optical disc device, a magnetic disc device, a disc controller which controls the optical...
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5808977 |
Tracking method and recording means thereby
An object of the present invention is to provide a novel tracking method and device, suitable for use in a recording means applying the technology of a scanning probe microscope, for recording...
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5780982 |
Method of and apparatus for controlling rotation number of motor
A rotation number of a motor adapted to rotate a record medium having a disc shape with respect to a pickup is controlled. The controlling method is provided with steps of: calculating switching...
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5764613 |
optical pickup apparatus
An optical pickup apparatus is constructed of an objective lens for condensing a light beam emitted from a light source toward an optical recording medium, and a convex lens arranged between the...
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5621709 |
Tracking servo apparatus
A tracking servo apparatus having a device for detecting the degree of disk eccentricity. At least either the pulse width or the peak value of brake pulses is controlled upon track jump in...
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5566145 |
Head tracking system in a disk drive
A head tracking system includes an optical head mounting thereon a focusing lens for generating an optical spot on a disk file. The system retrieves a normalized speed profile including a first...
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5537372 |
High density data storage system with topographic contact sensor
A high density data storage system includes a rotatable storage medium mounted to rotate about a drive axis, the storage medium having formed thereon a surface topography defining machine readable...
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5485445 |
Disc driving apparatus having means for placing a read record head at a predetermined position in the innermost region of a disc
A disc driving apparatus comprising an optical head as a record/reproduce means for recording information on and/or reproduce the same optically from a disc type recording medium;a feed motor as a...
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5420841 |
Spindle motor control circuit for optical recording and regenerating system
A spindle motor control circuit for an optical recording and regenerating system is disclosed. The spindle motor control circuit adjusts the gains in response to the change of the position of the...
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5402280 |
Method and apparatus for runout correction due to disk slip or spindle imbalance
In a disk storage device, a method and apparatus for correcting a "runout" error by adding to the servo control signal a sinusoidal signal of amplitude and phase derived to cancel the runout error.
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5384524 |
Voice coil motor control circuit and method for servo system control in a computer mass storage device
A voice coil motor ("VCM") control circuit controls operation of a VCM which positions a disk drive head/actuator arm assembly. A data processor is continuously updated with the current position...
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5375114 |
Recording and reading space control between a read/write probe and a recording medium
In order to effect the reading-out of a signal from a recording medium at a high speed and without the collision of a probe electrode, the control of the spacing between the probe electrode and the...
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5329513 |
Angular relationship detection device and method
An encoder or an information reading device detects a scale with a probe that is vibrated at a predetermined frequency and amplitude in a predetermined direction. The angular positional...
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5315572 |
Information reproducing apparatus capable of eliminating jitters
A read head makes a relative movement with respect to a recording medium to simultaneously read data from at least two of a plurality of recording areas of the recording medium in which the data is...
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5301173 |
Optical recording apparatus with two tracking error signals
When an information signal is recorded by irradiating a laser beam onto an optical recording disc, a carriage error signal corresponding to a deviation of an irradiating position of a carriage in...
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5291472 |
Information recording and reproduction methods using oscillation medium or transducer
High density recording systems and methods are disclosed which employ a radiation beam to form spot-like recordings in record members such as discs, tapes and cards. The angle, offset or...
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5283773 |
Steering laser beam while etching optical servo tracks for magnetic disks
A beam of light used to etch servo tracks on a magnetic disk is steered with an acousto-optical device to maintain the beam in concentrical patterns while mechanically moving the optics which...
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5280466 |
Optical disc and apparatus for reproducing signals recorded on the same
An optical disc is provided with: a signal track formed on a signal recording surface of the optical disc; and a plurality of cross-talk detection areas each formed on a portion of the signal track...
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