With Servo Positioning Of Transducer Assembly Over Track Combined With Information Signal Processing Patents (Class 369/43)
  • Patent number: 11906397
    Abstract: Methods of and systems for actively detecting an increasing amount of backlash within a machine's mechanical power application to detect, predict, and estimate future mechanical failure.
    Type: Grant
    Filed: March 23, 2022
    Date of Patent: February 20, 2024
    Inventor: Martin E. Best
  • Patent number: 11202049
    Abstract: Methods and systems for managing content items are described. A content item may be separated into components, such as chroma components, luminance components, and audio components. For more efficient management of the content, including for storage and delivery of the content, the separate components may be stored at different locations. For example, chroma components may be stored on a central server, while luminance and audio components are stored at other locations, such as edge servers, or vice versa, to accommodate network efficiency considerations. When content is delivered to a player, two or more separate streams carrying different content components may be delivered to the player.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: December 14, 2021
    Inventors: Douglas Bay, David Leach
  • Patent number: 11175633
    Abstract: A system and method for fast converging gain calibration for phase lock loops (PLL) are herein disclosed. According to one embodiment, a method includes receiving, with a voltage generation circuit, an input value representing a difference between a sampled voltage and a reference voltage, and adjusting, with the voltage generation circuit, the reference voltage by generating a voltage output based on the difference represented by the input value.
    Type: Grant
    Filed: July 22, 2020
    Date of Patent: November 16, 2021
    Inventors: Chih-Wei Yao, Ronghua Ni
  • Patent number: 9726471
    Abstract: A position sensor includes a variable capacitor assembly and a circuit board. The variable capacitor assembly includes a baseboard and a dielectric coupling element. The baseboard includes a baseboard body, a grounding electrode and two power electrodes. The grounding electrode is disposed nearby one side of the baseboard body. The two power electrodes are disposed separately near the other side of the baseboard body. The dielectric coupling element is spaced with the two power electrodes and the grounding electrode, and operable to be moved along a moving path. A covering condition is varied when the dielectric coupling element is operated to move along the moving path. When a power is alternatively applied to the power electrodes, a pair of capacitance values between the grounding electrode and the power electrodes is varied with the covering condition to accordingly determine a relative position of the coupling element along the moving path.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: August 8, 2017
    Assignee: Taiwan Alpha Electronic Co., Ltd.
    Inventors: Tzu-Hsuan Huang, Wei-Liang Liu, Chao-Jen Ho, Chien-Chih Ho
  • Patent number: 9250143
    Abstract: A multicapacitor sensor system facilitates the measurement of applied shear and moment forces. In one disclosed configuration, moments may be detectable in x, y and z directions, resulting in a full, 3-axis load cell with 6 degrees of freedom. The system may further include electrical circuitry to generate electrical drive pulses, sense amplify and buffer the voltages induced on the sense plates, and compute applied forces. An array of multicapacitor sensors that can be addressed individually without cross-talk and globally produce a map of forces and moments applied to the whole array. A MEMS implementation enables in vivo application.
    Type: Grant
    Filed: September 19, 2012
    Date of Patent: February 2, 2016
    Assignee: College Park Industries, Inc.
    Inventors: Richard H. Harrington, Michael G. Leydet
  • Patent number: 9054672
    Abstract: Variable capacitive attenuation circuitry and associated methods are disclosed that may be implemented to employ a plurality of multi-purpose capacitors that may be selectably coupled together in different configurations to form a capacitive divider having different respective attenuation properties. In a particular embodiment, each of the capacitors of the disclosed capacitive attenuation circuitry may be selectably coupled to an RF reference as either a shunt capacitor or coupled in series between an RF signal input and an attenuated RF signal output as a series capacitor, thus forming a capacitive divider having selected attenuation properties. The disclosed variable capacitive attenuation circuitry may be advantageously utilized to attenuate an input RF signal and to provide a resulting attenuated RF output signal, for example, in the front end of RF receiver circuitry.
    Type: Grant
    Filed: May 8, 2012
    Date of Patent: June 9, 2015
    Assignee: Silicon Laboratories Inc.
    Inventor: Michael S. Johnson
  • Patent number: 9019806
    Abstract: This invention is provides a means of playing LP records with minimal distortion. Low distortion is achieved by eliminating tracking error normally associated with pickup cartridges mounted to pivoting tone arms. This invention discloses a tone arm that constrains the motion of the stylus to straight radial path, mimicking the cutting path of the record lathe, supported on parallel rails by free rolling spherical bearings. Unlike many previous linear tracking tone arms, this invention does not rely on air pressure or servo motor mechanisms. The use of free rolling bearings or axles between parallel tracks fashioned from rails, rods or tubes, eliminates all sources of lateral friction other than pure static and rolling friction of the balls on the rails, rods or tubes. In the preferred embodiment, the fixed rods or tubes are driven synchronously, thereby eliminating static friction of the supporting rolling balls.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: April 28, 2015
    Inventor: Thomas Lloyd Bowden, Sr.
  • Publication number: 20140139944
    Abstract: Storage media, systems, and techniques for storing and accessing information in a servo band are described. For example, the distances between adjacent servo patterns written to the servo band may be varied to represent the supplemental information stored in the servo band. Each of the varied distances may be selected to represent physical parameters of the storage medium, servo recording conditions, or data unrelated to the servo patterns, for example. The supplemental information may be recovered from the servo band by demodulating a signal generated from a servo read head. The distances between each servo pattern in the track may be calculated from the time periods detected in the signal between servo marks of subsequent servo patterns. In some examples, a controller may adjust one or more parameters associated with reading or writing servo marks or data marks of the storage media.
    Type: Application
    Filed: November 16, 2012
    Publication date: May 22, 2014
    Inventors: Douglas W. Johnson, Larold L. Olson
  • Publication number: 20140022877
    Abstract: According to various embodiments, a method for reading data from a storage medium using a reader, wherein the reader includes at least one reader head, may be provided, wherein the storage medium includes a plurality of tracks. The method may include: reading a first signal with a reader head of the reader at a pre-determined position of the storage medium; reading a second signal with a reader head of the reader at the pre-determined position of the storage medium; and determining data stored at the pre-determined position of the storage medium based on the first signal and based on the second signal.
    Type: Application
    Filed: July 19, 2013
    Publication date: January 23, 2014
    Applicant: Agency for Science, Technology and Research
    Inventors: Chun Lian Ong, Zhimin Yuan, Shiming Ang
  • Patent number: 8446802
    Abstract: An optical drive device includes first and second light sources, an objective lens configured to receive a first light emitted from the first light source and a second light emitted from the second light source and to irradiate both the first light and the second light to an optical disc recording medium, a first focus mechanism configured to drive the objective lens in a focus direction, a second focus mechanism configured to change collimation of the second light incident to the objective lens and changing the focusing position of the second light independently of the first light, a first focus servo control unit configured to drive the first focus mechanism, an error signal subtraction unit configured to subtract the first focus error signal from a second focus error signal, and a second focus servo control unit configured to drive the second focus mechanism.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: May 21, 2013
    Assignee: Sony Corporation
    Inventors: Tsutomu Ishimoto, Toshihiro Horigome
  • Patent number: 8424856
    Abstract: A hand-actuated bar clamp apparatus is disclosed which provides a high level of holding power or force on a workpiece. The bar clamp includes first and second jaws that are movably coupled to a bar. The first jaw includes a drive lever that engages the bar and a trigger that drives the drive lever to move the bar relative to the first jaw. A brake mechanism is contained within the first jaw to prevent it from moving in the opposite direction. The second jaw includes a push-button release assembly and a stop mechanism actuated by the push-button release assembly. The stop mechanism frictionally engages the second jaw to the bar when the second jaw is not under load.
    Type: Grant
    Filed: September 13, 2007
    Date of Patent: April 23, 2013
    Assignee: Stanley Black & Decker, Inc.
    Inventors: Keith M. Lombardi, Eric Ranieri
  • Patent number: 8274252
    Abstract: A motor control apparatus includes a sub-controller including a two-degree-of-freedom repetitive compensator and a shaping filter. The two-degree-of-freedom repetitive compensator includes a forward delay placed in a forward route of a loop and a feedback delay placed in a feedback route thereof and is configured so that a total delay time provided by the forward delay and the feedback delay is equal to the cycle of a target command or a disturbance. The shaping filter is configured so that the product of the pulse transfer function of the two-degree-of-freedom repetitive compensator and the complementary sensitivity function of a general-purpose control system has a low-pass characteristic.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: September 25, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Wennong Zhang, Hiroshi Nakamura
  • Publication number: 20120092975
    Abstract: A method and apparatus for performing a read/write process on a recording medium having a defect, the method including determining an area of a recording medium, in which a defect, greater than a first set threshold, occurring in units of tracks, to be a massive defective area; adjusting a first parameter representing a logical track length, based on a size of a defect occurring in each track included in the massive defective area; and performing the read/write process on the recording medium by using the adjusted first parameter.
    Type: Application
    Filed: September 22, 2011
    Publication date: April 19, 2012
    Inventor: Walter JUN
  • Patent number: 8090906
    Abstract: 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 environmental condition is identified based at least in part on the signal. A second processor in the disk drive is caused to execute the code associated with the environmental condition, and a responsive task is performed at the first processor based at least in part on the executed code associated with the environmental condition.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: January 3, 2012
    Assignee: Western Digital Technologies, Inc.
    Inventors: Greg A. Blaha, Kenny T. Coker, Alan T. Meyer
  • Patent number: 7965589
    Abstract: 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 layer on the base layer. Additional electrodes or magnetic components may be placed on the base layer to provide electromagnetic or electrostatic forces to rotate the recordable disc when acted on by the actuation mechanism. As an example, the invention may utilize MEMS techniques in order to integrate a disc and motor of a disc drive as a common component.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: June 21, 2011
    Assignee: Seagate Technology LLC
    Inventors: Roger Hipwell, Nurul Amin, John Pendray, Andrew White, Bradley Ver Meer, Hans Leuthold, Menachem Rafaelof, Wayne Bonin
  • Patent number: 7767255
    Abstract: 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 thin layer (4) of at least a magnetic material laterally covering this flat material and deposited at oblique incidence relative to the normal (z) to the plane (6) of the array. The invention applies in particular to computer hard drives.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: August 3, 2010
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Bernard Rodmacq, Stéphane Landis, Bernard Dieny
  • Publication number: 20090274017
    Abstract: An integrated data storage control system provides, in a single integrated circuit, RDC, servo logic, ATA interface, microprocessor, and other formerly discrete components in one highly integrated system design. The integrated circuit is rendered using a single integrated circuit technology type (e.g., digital CMOS) for all components. Analog and digital circuits are combined in such a way as to eliminate or reduce noise or interference in digital circuits from analog circuit components. Individual elements may have their outputs and inputs MUXed together such that individual elements can be selectively switched (during testing modes) such that the integrated circuit emulates or behaves in the same or similar manner as one of the prior art components. The present invention may be applied to magnetic hard disk drives (HDDs) or other types of storage devices such as floppy disk controllers, optical disk drives (e.g., CD-ROMs and the like), tape drives, and other data storage devices.
    Type: Application
    Filed: May 5, 2009
    Publication date: November 5, 2009
    Inventors: Siamack Nemazie, Kaushik Popat, Balaji Virajpet, William R. Foland, JR., Roger McPherson, Maoxin Wei, Vineet Dujari, Shiang-Jyh Chang
  • Patent number: 7598499
    Abstract: 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 pattern presented in a pattern definition means (102) onto the target (41) held at position by means of a target stage; no elements—other than the target itself—obstruct the path of the beam after the optical elements of the projection system. In order to reduce contaminations from the target space into the projection system, a protective diaphragm (15) is provided between the projection system and the target stage, having a central aperture surrounding the path of the patterned beam, wherein at least the portions of the diaphragm defining the central aperture are located within a field-free space after the projection system (103).
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: October 6, 2009
    Assignee: IMS Nanofabrications AG
    Inventor: Elmar Platzgummer
  • Patent number: 7546003
    Abstract: 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 insulating cover layer formed on the insulating base layer so as to cover the conductive pattern, and an optical waveguide.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: June 9, 2009
    Assignee: Nitto Denko Corporation
    Inventors: Noriyuki Juni, Kazunori Mune, Sazzadur Rahman Khan, Toshiki Naito, Yutaka Aoki
  • Publication number: 20090141597
    Abstract: A near field optical recording device and method of operating a near field optical recording device, the device being arranged to cooperate with an optical record carrier. The device comprising means to adjust tilt of a refractive optical element with respect to the optical record carrier according to a distance between the refractive optical element and the data layer of the optical record carrier to be accessed.
    Type: Application
    Filed: April 12, 2007
    Publication date: June 4, 2009
    Inventor: Coen Adrianus VERSCHUREN
  • Publication number: 20090003146
    Abstract: Apparatus and related methods are described for adjusting servo gain. In an exemplary apparatus, a circuit determines a bias force error that occurs between an estimated bias force and an actual bias force on an actuator during movement by a servo motor. The circuit adjusts a servo gain in response to the bias force error, and regulates movement of the actuator by the servo motor in response to the servo gain.
    Type: Application
    Filed: June 29, 2007
    Publication date: January 1, 2009
    Inventors: KeXiu Liu, JianGuo Zhou, MingZhong Ding, KianKeong Ooi, WenJun Cao
  • Publication number: 20080259748
    Abstract: An optical disc includes a SPOKE potion for detecting a position in a circumferential direction of the optical disc, which is formed on an inner or outer circumferential side relative to a data recording area and visible image drawing area. A signal portion in which each signal is constituted by a pair of light nonreflecting portion and light reflecting portion is formed in the SPOKE portion. The signal portion includes a first signal portion in which signal widths of the nonreflecting portion and reflecting portion are the same and a second signal portion in which the signal widths of the nonreflecting portion and reflecting portion are changed.
    Type: Application
    Filed: April 16, 2008
    Publication date: October 23, 2008
    Applicant: Toshiba Samsung Storage Technology Corporation
    Inventors: Takeyuki MINAMIMOTO, Masakatsu KINOSHITA
  • Publication number: 20080225654
    Abstract: Compensation for repeated runout (RRO) error, such as in a data storage device servo circuit, is preferably carried out by obtaining a population distribution of RRO error values from at least selected ones of a subset of tracks. An RRO error compensation value is determined for each one of the subset of tracks when a variance characteristic of said population distribution meets a selected criterion. Preferably, a first track of a storage medium has a servo field at a first angular position on the medium, a repeated runout (RRO) error compensation field at a second angular position on the medium, and a user data field at a third angular position on the medium. An immediately adjacent second track preferably has a servo field at the first angular position and a user data field at the second angular position in lieu of an RRO error compensation field.
    Type: Application
    Filed: March 14, 2007
    Publication date: September 18, 2008
    Applicant: Seagate Technology LLC
    Inventors: Reed D. Hanson, Thomas C. Zirps, Peng Yan, Samir Mittal, Timothy F. Ellis
  • Patent number: 7420895
    Abstract: 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 signals respectively corresponding to reflected first and second sub light beams, and an optical recording and/or reproducing apparatus using the same are provided. When detection signals respectively corresponding to one side portions, in a direction corresponding to a radial direction of the optical information storage medium, of the respective main light beam and first and second sub light beams are referred to as a first main signal, a first sub signal, and a second sub signal, respectively, the method and apparatus include obtaining a first operational signal, which is used to determine on-track/off-track and/or a track cross direction, by performing a subtraction on the combination of the first and second sub signals, and the first main signal.
    Type: Grant
    Filed: December 29, 2003
    Date of Patent: September 2, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eun-goo Kim, Chun-gi Kim, Kyoung-hwan Park, Ji-hwan Lim
  • Patent number: 7421359
    Abstract: 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 calibrated sense resistor gain value. A method is provided for calibrating a Bemf detector circuit by setting a sense resistor gain to a plurality of different gain values, observing Bemf sample values for each of the gain values, and deriving a calibrated gain value by non-iteratively modeling the relationship between the gain values and the associated Bemf sample values.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: September 2, 2008
    Assignee: Seagate Technology LLC
    Inventors: Brent Jay Harmer, KarWei Koay
  • Publication number: 20080159087
    Abstract: A pickup for accessing moving storage media carrying substantially parallel information tracks has a carrier, an actuator with a lens and suspension wires extending from the rear of the carrier and joining the carrier and the actuator. The actuator is movable in the focus direction and in a tracking direction and has a substantially rectangular flat board carrying the lens and a counter weight. The flat board is arranged orthogonal to a focus direction and carries tracking and focus coils. The pickup has a magnet configuration connected to the carrier with at least two tracking magnets, which are arranged in the tracking direction at opposite sides of the flat board and extend orthogonal to the focus direction above and/or under the flat board, and with at least two focus magnets, which are arranged in front of and behind the flat board and extend orthogonal to the direction of the tracks.
    Type: Application
    Filed: December 18, 2007
    Publication date: July 3, 2008
    Inventors: Michael Bammert, Tsuneo Suzuki, Rolf Dupper
  • Publication number: 20080151705
    Abstract: An arrangement for optimizing a servo controller power required in the operation of two-dimensional flexure (Microelectronic Memory Storage) MEMS devices.
    Type: Application
    Filed: March 6, 2008
    Publication date: June 26, 2008
    Inventors: Hien P. Dang, Sri M. Sri-Jayantha
  • Publication number: 20080080327
    Abstract: A command processing unit outputs a format command to an HDD. While the HDD is being formatted, a format-error causing unit outputs a reset command to the HDD. The reset command causes abnormal end of the formatting of the HDD, which makes reading of data from the HDD impossible.
    Type: Application
    Filed: July 30, 2007
    Publication date: April 3, 2008
    Applicant: Fujitsu Limited
    Inventors: Yoshinori Kadowaki, Hisato Suzuki, Nobuaki Harimoto, Kimiaki Haga
  • Patent number: 7319224
    Abstract: Provided are a semiconductor probe with a resistive tip, and a method of fabricating the semiconductor probe.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: January 15, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hong-sik Park, Kyoung-lock Baeck, Ju-hwan Jung, Hyoung-soo Ko, Chul-min Park, Seung-bum Hong
  • Patent number: 7317206
    Abstract: 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 layer. Furthermore, TiAl3 is not formed because of the presence of a TiN diffusion layer between the aluminum and the Ti layers. This novel structure has a low resistivity and is therefore suited for large displays that use thin film transistors to drive the pixels.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: January 8, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Tae-Sung Kim
  • Publication number: 20070274166
    Abstract: With a high-density optical disc drive, although it is necessary to correct spherical aberrations which depend on a disc substrate thickness error, operation of an aberrations correction element takes time and therefore easy correction according to a disc radius degrades the operability of the apparatus. The present invention comprises an optical pickup unit including an objective lens and an aberrations correction lens, a focus actuator, a tracking actuator, a aberrations correction motor, a seek motor, an aberrations correction lens control module, a radius information detecting module, and a system control module.
    Type: Application
    Filed: January 11, 2007
    Publication date: November 29, 2007
    Applicants: Hitachi, Ltd., Hitachi-LG Data Storage, Inc.
    Inventor: Seiji Imagawa
  • Patent number: 7301690
    Abstract: 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 optical elements with a reflecting surface are preferred. It is the object of the invention to provide for a changeability of optical parameters, in particular of the focal width with small time constants, in an inexpensive manner and with a small required constructional volume. The micro-optical arrangement according to the invention comprises a plate-like optical element onto which electromagnetic radiation is directed on an optically effective surface. The optical element thereby is fixed or clamped at least at one outer edge point. The optical element is elastically deformed due to mass inertia as a result of a translatory movement at least approximately parallel to the optical axis between two reversal points (?z0, z0).
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: November 27, 2007
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Harald Schenk, Christian Drabe
  • Publication number: 20070217299
    Abstract: A power control apparatus and method for an optical drive is disclosed. The power control apparatus estimates the temperature rising effect of a laser diode and performs a partial open-loop power control, achieving accurate write power control. Therefore, regarding to a high-speed, high-density optical disk recording medium combined with multi-pulse write waveforms, the invention can also achieve accurate write power control even though the response speed of a front photodiode is much slower than the modulation speed of recording pulses of the laser diode.
    Type: Application
    Filed: January 31, 2007
    Publication date: September 20, 2007
    Inventors: Hsin Po Wang, Lu Chia Tseng, Shu Ming Chang
  • Patent number: 7254525
    Abstract: 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 testing code that resides within the drive's manufacturing firmware, rather than relying on external testers. The invention involves exercising the drive's enqueue, dequeue, and command execution firmware, as well as the physical process of reading and writing data by simulating the host interface in code. The invention enqueues commands that typify the desired workload, allows a command ordering algorithm to sort the commands for execution, and allows the drive side code to execute the commands just as if an external host interface were attached. The invention is advantageous because the performance testing can be done by only applying power to the drive. The present invention also lends itself to performance tuning that can be done in manufacturing, to reduce drive-to-drive performance variations.
    Type: Grant
    Filed: October 17, 2002
    Date of Patent: August 7, 2007
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Trevor James Briggs, Adam Michael Espeseth, Robert Anton Steinbach, Christopher David Wiederholt
  • Patent number: 7206106
    Abstract: 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 a pinhole, a diffraction grating, embedded into the pinhole of the pinhole plate, for diffracting the light focused by the objective lens to produce 0th order diffracted light, +1st order diffracted light and ?1st order diffracted light therethrough, a photo detector for detecting the amounts of the 0th order, the +1st order and the ?1st order diffracted light, and a servo controller for comparing an amount of light of an overlapped area of the 0th order diffracted light and the +1st order diffracted light with an amount of light of an overlapped area of the 0th order diffracted light and the ?1st order diffracted light to control the position of the objective lens to pass the light through a center of the diffraction grating if the amounts of light are not identical to each other.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: April 17, 2007
    Assignee: Daewoo Electronics Corporation
    Inventor: Kun Yul Kim
  • Patent number: 7009791
    Abstract: 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 or the like surrounded by a certain closed curve as pattern elements on a plane, and arranging the pattern elements in circumferential and radial directions of a disc so that a phase and a head position establish a proportional relationship in two or more frequency components of a reproduced signal. Position signals of the two frequency components included in the reproduced signal from the position information signal pattern are obtained, and the two position signals are added up with a certain ratio so that a position signal without error is obtained.
    Type: Grant
    Filed: February 9, 2004
    Date of Patent: March 7, 2006
    Assignee: Fujitsu Limited
    Inventor: Keiji Shimatani
  • Patent number: 6947233
    Abstract: 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 detecting the servo mark, the R/W channel detects, from the read information, position information contained in the servo information and following the servo mark, at a timing determined by the detection timing of the servo mark. When the first mode has been switched to a second mode, the R/W channel detects the servo mark and position information using the synchronous method.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: September 20, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Akio Toda
  • Patent number: 6873492
    Abstract: 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 magnetic recording layer substantially conforming to the topographical features. Passage of a transducer over the features generates effects that can be detected in, and separated from, the magnetic recording signal.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: March 29, 2005
    Assignee: Imation Corp.
    Inventor: Garry R. Lundstrom
  • Patent number: 6839194
    Abstract: 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 servo interval. A correction circuit corrects a time period T2 on the basis of the measured servo interval and an ideal servo interval. A determination circuit determines which one of the time period T2 and a time period T2? obtained by correcting the time period T2 should be used. A servo-sector-pulse-generating unit generates a servo sector pulse a time period T1 after the detection of each servo mark, and generates a pseudo servo sector pulse when the time period determined by the determination circuit has elapsed after the detection of each servo mark, if the next servo mark is not detected during the determined time period.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: January 4, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Takahiro Koyanagi
  • Publication number: 20040184365
    Abstract: An optical disc drive apparatus includes a frame having a sidewall, and a disc tray supported by the frame. The frame has a supporting portion including a guide rib formed protruding from an inner wall surface of the sidewall and a plurality of guide protrusions formed protruding upward from the guide rib. The disc tray has a supported portion implemented by a guide groove slidably engaging to the plurality of guide protrusions. A guide protrusion positioned at the forefront among the plurality of guide protrusions is structured so as to come in surface-contact with a wall surface implementing the guide groove. With such a structure, an optical disc drive apparatus unlikely to be broken even if a force in a transversal direction is applied to the disc tray while the disc tray is at a disc-removable position can be obtained.
    Type: Application
    Filed: March 16, 2004
    Publication date: September 23, 2004
    Inventor: Kazumasa Nasu
  • Publication number: 20040141432
    Abstract: An optical information recording and reproducing apparatus that determines the quality of recorded information through a beta value from information on the amplitude of a reproduced signal and if the beta value is outside the permissible range, outputs information on error to a host computer. Immediately after the information is recorded the information is reproduced first and second kinds of information including information on the amplitude of the reproduced signal and performance information or error information obtained from a binarized signal of that reproduced signal, respectively are used to determine the quality of the reproduced signal. Recording power condition is changed based on the first kind of information and a recording pulse width condition or reproduction condition is changed based on the second kind of information to ensure the reliability of the information recorded.
    Type: Application
    Filed: May 20, 2003
    Publication date: July 22, 2004
    Applicants: Hitachi, Ltd., Hitachi-LG Data Storage, Inc.
    Inventors: Tsuyoshi Toda, Toshimitsu Kaku
  • Patent number: 6762402
    Abstract: 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 storage medium and a probe which is installed to face the storage medium and is used for recording data on the storage medium and reading the data from the storage medium. The storage medium includes a substrate, a conductive layer formed on the substrate and a dielectric layer formed on the conductive layer. With the apparatus for recording and reading data, it is possible to solve problems concerning data retention, data read speed and signal-to-noise ratio which have been at issue in developing data storage media with the use of conventional scanning probe microscopic techniques.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: July 13, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-joon Choi, Jong Up Jeon, Jung-gyu Shin
  • Publication number: 20040057350
    Abstract: On an optical disc including a substrate on which pits having at least two different depths are formed, main information is recorded by the shape of the pits and additional information is recorded by the depth of the pit. It is possible to reverse polarity of a tangential push-pull signal dependent on the depth of the pit, and therefore it becomes possible to record information utilizing the depth of the pit. This improves recording density of the optical disc. Further, when information of the optical disc is to be copied, the information recorded by the depth of the pit cannot be copied. Therefore, unauthorized reproduction can be prevented.
    Type: Application
    Filed: September 24, 2003
    Publication date: March 25, 2004
    Inventors: Junsaku Nakajima, Hitoshi Takeuchi, Masaru Nomura
  • Publication number: 20040027935
    Abstract: A dielectric recording medium unit is provided with: the dielectric recording/reproducing head; a tracking mechanism of the dielectric recording/reproducing head; the dielectric recording medium placed facing to a probe of dielectric recording/reproducing head; and a X-Y stage for parallel-translating the dielectric recording medium These components are stored in a package. The package is provided with: an electrical connection device for allowing the electrical connection with an external apparatus; and mechanical connection devices for allowing the mechanical connection with the external apparatus.
    Type: Application
    Filed: June 5, 2003
    Publication date: February 12, 2004
    Inventors: Yasuo Cho, Atsushi Onoe
  • Patent number: 6680884
    Abstract: 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 information carrier and for generating a position signal which indicates a position of a scanning point scanned by the transducer. The apparatus further includes means for rotating the information carrier about an axis and means for moving the scanning point in a radial direction with respect to the axis. The apparatus has a scanning mode in which the scanning point jumps both from one track to another in a first radial direction and from one track to another in an opposite second direction during reading or writing of a file.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: January 20, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Arnoldus J. Niessen, Joris J. Vrehen
  • Patent number: 6608801
    Abstract: A position control apparatus of an optical system capable of positioning a lens at a high accuracy in a near-field optical system using a solid immersion lens. An objective lens 2 and a solid immersion lens are fixed to a lens holder 4. The lens holder 4 is moved by a tracking actuator 5 in the tracking direction of an optical disk 51 and is moved by a focus actuator 8 in the focus direction. The focus actuator 8 is controlled on the basis of the electrostatic capacitance occurring between the solid immersion lens 3 and the optical disk 51.
    Type: Grant
    Filed: February 16, 2001
    Date of Patent: August 19, 2003
    Assignee: Sony Corporation
    Inventors: Isao Ichimura, Koichiro Kishima, Kiyoshi Osato
  • Publication number: 20030133372
    Abstract: A position sensor for use in connection with a movable system having a pair of objects that are configured to move relative to one another along an axis through an operative range of motion. The position sensor includes a first plate secured to one of the objects and a pair of second plates secured to the other of the objects. The second plates are adjacent each other and coplanar. The first plate and second plates are configured so that the second plates are spaced from and parallel to the first plate as the objects move relative to one another along the axis. The first plate and second plates are configured so that they form two variable, spaced-plate capacitors having capacitances that vary as the objects move relative to one another within the operative range along the axis. The position sensor is configured to use the capacitances to generate output usable to determine relative position of the objects along the axis.
    Type: Application
    Filed: January 11, 2002
    Publication date: July 17, 2003
    Inventors: Donald J. Fasen, Storrs T. Hoen
  • Patent number: 6564009
    Abstract: 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 approximately 680 (nm) or less to the optical disk and having a lens with a numerical aperture (NA) of approximately 0.7 or more and a working distance of approximately 560 (&mgr;m) or less. By utilizing such apparatus, a relatively large amount of data may be recorded onto the optical disk.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: May 13, 2003
    Assignee: Sony Corporation
    Inventors: Hideo Owa, Shoei Kobayashi, Susumu Sensyu, Shinji Katsuramoto, Toshio Watanabe, Hidenori Mori, Masanobu Yamamoto, Masaki Saito
  • Patent number: 6525897
    Abstract: 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 a track and selecting from two or more data signals a data signal having the least amount of errors is shown. The apparatus uses information about the extent of errors to perform a control function for reproducing the data stored in predetermined storage locations in a storage media. The apparatus positions a transducer for sensing from predetermined storage locations stored data containing at least one constraint. The transducer generates a first signal representative of the data containing at least one constraint stored in the sensed data and any errors introduced into the sensed data during the sensing.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: February 25, 2003
    Assignee: Acorn Technologies, Inc.
    Inventors: Alvin M. Despain, R. Stockton Gaines
  • Patent number: RE40413
    Abstract: 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 a track and selecting from two or more data signals a data signal having the least amount of errors is shown. The apparatus uses information about the extent of errors to perform a control function for reproducing the data stored in predetermined storage locations in a storage media. The apparatus positions a transducer for sensing from predetermined storage locations stored data containing at least one constraint. The transducer generates a first signal representative of the data containing at least one constraint stored in the sensed data and any errors introduced into the sensed data during the sensing.
    Type: Grant
    Filed: February 25, 2005
    Date of Patent: July 1, 2008
    Assignee: Purchased Patent Management LLC
    Inventors: Alvin M. Despain, R. Stockton Gaines