Patents Examined by Aristotelis Psitos
  • Patent number: 5612833
    Abstract: During a write revolution of a storage medium, a transition is written on the storage medium while servoing on another transition previously recorded on the storage medium. During that write revolution, a position error signal corresponding to the position error of the transducer relative to the previously recorded transition is determined. That position error signal is then stored, during the write revolution, to be used in computing a reference track value associated with the transition being written to correct for the position error. Additionally, a product servo-pattern is written, which includes an embodying of the position error therein.
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: March 18, 1997
    Assignee: International Business Machines Corporation
    Inventors: Edward J. Yarmchuk, Mark D. Schultz, Bucknell C. Webb, Timothy J. Chainer
  • Patent number: 5612829
    Abstract: The present invention pertains to a data recording control method of a magnetic tape in which tape a data, constructed by combining a plurality of packets into physical blocks, is recorded, the method being such that: the entire physical block of data is read from a magnetic tape and store in a buffer, when a command for reading a data corresponding to a packet in the physical block is output from a host unit; a new physical block is created by reorganizing the data in the buffer and the data to be recorded, when a write command and the data to be recorded are output from the host unit at any position in the physical block on the magnetic tape; and the data thus reorganized into a physical block is recorded on the magnetic tape.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: March 18, 1997
    Assignee: Fujitsu Limited
    Inventors: Nobuyuki Takai, Kazufumi Hiyamizu
  • Patent number: 5612832
    Abstract: A cassette deck of a car stereo has at least one capstan and a motor for driving the capstan. An accessory switch is provided in a car provided with the car stereo. A accessory switch detector is provided for detecting closing of the accessory switch. A cassette detector is provided for detecting setting of a cassette to the cassette deck. In response to detection of closing of the accessory switch, and setting of the cassette, the motor is operated for rotating the capstan for a predetermined time.
    Type: Grant
    Filed: November 7, 1995
    Date of Patent: March 18, 1997
    Assignee: Pioneer Electronic Corporation
    Inventors: Terumasa Simizu, Mutsurou Tanoue, Masaya Kano, Mitsugu Ogino, Jun Sato
  • Patent number: 5612835
    Abstract: A disk apparatus includes a head, a motor for moving the head to a track position on a disk in response to a motor driving signal, a driving-signal generating section for issuing the motor driving signal to the motor in response to each of an external drive instruction from a host, a first drive instruction and a second drive instruction, each of which includes data indicative of the number of tracks for the head to be moved and data indicative of a direction for the head to be moved to, a detector for detecting that the disk is inserted, a first instruction generating section for issuing the first drive instruction such that the head is positioned on a track 0 position of the disk when the detector detects that the disk is inserted, a first counter for summing the number of tracks of each of the external, first and second drive instructions in consideration of the direction, and a second counter for summing the number of tracks of the external drive instruction in consideration of the direction, a second ins
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: March 18, 1997
    Assignee: NEC Corporation
    Inventors: Hideyuki Shirota, Tatuya Matuzaki
  • Patent number: 5612830
    Abstract: The back edge of a disk drive slider is used to remove debris from disk media by slowly sweeping it from the inner diameter of the disk to the outer diameter of the disk while the disk is rotating backwards from normal. The sweeping operation is completed while the disks are still gaining rotational speed so that liftoff velocity is not achieved. Material accumulated on the back edge of the slider is either dumped at the outer diameter of the disk, or remains on the back edge of the slider as normal operation is commenced.
    Type: Grant
    Filed: September 14, 1994
    Date of Patent: March 18, 1997
    Assignee: International Business Machines Corporation
    Inventors: Thomas A. Gregory, Christopher G. Keller, James M. Severson
  • Patent number: 5608585
    Abstract: A tape run control unit in the magnetic recording/reproducing apparatus is provided with a discrimination element and a control element. The discrimination element detects a stand-by time until a signal to be recorded is received in repositioning of the tape and generates a discrimination signal for discriminating the length of the stand-by time. The control element controls tape run driving unit such as a capstan motor during the reposition and controls the stop position of the tape such that a magnetic head scans the portion of the tape where no data is recorded. After completion of repositioning, furthermore, the control element works according to a discrimination signal so as to select the stop mode which involves the release of pinch roller when the stand-by time is long and to select the mode for simply stopping only the capstan when the stand-by time is short.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: March 4, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Kenmei Masuda, Kenji Ogiro, Hidefumi Goto, Sadao Hirose, Satoshi Fujino, Shinya Fujimori, Katsuhiko Izumi
  • Patent number: 5608584
    Abstract: A single reel tape cartridge includes a type of magnetic recording tape having characteristics which are identified to a cartridge tape handling system in accordance with size variation of a tape type hole following a beginning of tape (BOT) hole by a predetermined, qualifying distance. A cartridge tape handling system for identifying the particular tape type, and for formatting the tape in accordance with determined tape type is also described.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: March 4, 1997
    Assignee: Quantum Corporation
    Inventors: Mitchell R. Steinberg, George A. Saliba
  • Patent number: 5606469
    Abstract: A method for writing a servo pattern in a hard disk device comprises the steps of reproducing a first servo signal from a servo surface, recording a second servo pattern on a recording surface using a data head by controlling the data head on a track defined on the recording surface, reproducing a second servo signal from the recording surface in response to the second servo pattern recorded thereon using the data head, detecting an off-track of the data head with respect to the predetermined track on the recording surface; shifting the data head in a radial direction of the recording surface with an offset such that the off-track is canceled, and recording a third servo pattern on the recording surface using the data head at a position determined in the step of shifting the data head.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: February 25, 1997
    Assignee: Fujitsu Limited
    Inventors: Tatsuhiko Kosugi, Nobuyuki Suzuki
  • Patent number: 5606463
    Abstract: A magnetic recording and/or reproducing apparatus includes a rotating drum for conveying a magnetic recording medium and a magnetic head being mounted on the drum and kept in sliding contact with the magnetic recording medium. The magnetic head records signals on the recording medium in a recording mode and does not record signals on the recording medium in a recording pause mode. The magnetic head reproduces signals recorded on the recording medium in a motion picture reproducing mode and does not reproduce signals recorded on the recording medium in a still picture reproducing mode. The apparatus further includes a drum rotation control circuit for controlling the rotating speed of the drum. The drum is rotated at a lower speed during the recording pause mode than during the recording mode and is rotated at a lower speed during the still picture reproducing mode than during the motion picture reproducing mode.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: February 25, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hirofumi Niwa
  • Patent number: 5606467
    Abstract: A semiconductor memory is installed in a magnetic tape cassette so as to enable electric signals transmitted from the outside of the magnetic tape cassette to be recorded therein or reproduced therefrom. In addition, the magnetic tape cassette includes an output/input terminal by way of which the semiconductor memory is electrically connected to a recording/reproducing unit. With this construction, when the direction of running of a magnetic tape is reversed during a recording or reproducing operation, the recording/reproducing function of the semiconductor memory can be utilized in place of the recording/reproducing function of the magnetic tape with the aid of a changeover signal previously inputted into the magnetic tape at a position, e.g., in the proximity of the end of the magnetic tape. Thus, the occurrence of interruption the recorded/reproduced signals can be prevented by virtue of the substitutive recording/reproducing function of the semiconductor memory.
    Type: Grant
    Filed: September 5, 1991
    Date of Patent: February 25, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Hidetoshi Hirata
  • Patent number: 5604647
    Abstract: The present invention relates to a video cassette recorder (VCR). The present invention decides the mode conversion of the VCR by checking the mode switch signal and displays the mode error data in the abnormal mode conversion, Also, the present invention decides the operation state corresponding to each mode by using the reel pulse and drum pulse and displays the error data if in an abnormal state, thereby informing the users whether the VCR is normal or not.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: February 18, 1997
    Assignee: SamSung Electronics Co., Ltd.
    Inventor: Seong W. Jo
  • Patent number: 5604648
    Abstract: A circuit for controlling a speed and a phase of a VCR servo system includes a Control (CTL) signal generation section, a speed error detection section, a phase error detection section and a speed/phase control section. The phase error detection section has a recording phase error detector and a playback phase error detector. A CTL signal blank discrimination section inputs a CTL pulse from the playback phase error detector, discriminates a blank interval of a CTL signal based on the inputted CTL pulse, and outputs discrimination signal in accordance with the discriminated result. A first switching control section inputs the discrimination signal, an FF/REW mode signal, a recording mode signal and a tape type discriminating signal and performs a logical operation based on the inputted signals to output a first control signal.
    Type: Grant
    Filed: April 13, 1995
    Date of Patent: February 18, 1997
    Assignee: Goldstar Co., Ltd.
    Inventor: Young G. Oh
  • Patent number: 5602693
    Abstract: A system for positioning a plurality of heads traversing multiple disks in a disk drive system is disclosed herein. The positioning system includes a servo pattern recorded on at least one of the hard disks, the servo pattern having a sequence of servo locations successively recorded along concentric tracks on the disks. Burst zones are also recorded on the hard disks, each burst zone having multiple transitions recorded at staggered separate radial distances from the center of the disks. The positioning system contains means for computing servo burst signal magnitudes based on head position relative to the transitions in each burst zone, and means for calculating a head offset based on differences between the servo burst signal magnitudes and radial displacement of each head in each track. The positioning system transmits a correction signal based on calculated head position, and the output signal has a linear response for any head position on the disk.
    Type: Grant
    Filed: December 14, 1994
    Date of Patent: February 11, 1997
    Assignee: Micropolis (S) PTE Ltd.
    Inventors: Don Brunnett, Ashok K. Desai
  • Patent number: 5602685
    Abstract: A data interleaving method for a digital recording system providing increased error correction capacity includes steps for determining a moduli number (NMod) in accordance with the number of fields per frame and the number of segments per field, assigning a number from zero to NMod-1 for each track, determining macro-blocks to be recorded on each track in accordance with a remainder value obtained by dividing a macro-block number assigned to each macro-block by the moduli number, and the number assigned to the each track paired with recording the data for respective macro-blocks determined for each track. A corresponding apparatus adapted to perform the above-described method is also described. The method and apparatus advantageously increase the error correction capacity of respective error correction codes.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: February 11, 1997
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sang-rak Lee
  • Patent number: 5602688
    Abstract: A method and apparatus for controlling surface pressure exerted on a movable magnetic head by a recording medium to provide optimum contact between the movable magnetic head and the recording medium with high precision in a wide frequency range. An estimated surface pressure exerted by the recording medium on the movable magnetic head is determined based upon an electrical simulation of the characteristics of the movable magnetic head. The estimated surface pressure exerted is compared to a reference surface pressure in order to develop a surface pressure control signal. The surface pressure tension of the magnetic recording medium and the position of the movable magnetic head may be controlled in accordance with the surface pressure control signal.
    Type: Grant
    Filed: September 11, 1995
    Date of Patent: February 11, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Eiji Yokoyama, Masato Nagasawa
  • Patent number: 5602690
    Abstract: A clock signal generating apparatus and method in which data recorded in a plurality of tracks and clock marks recorded at equal angular spaces at different radial distances on a rotating disk are reproduced by a reproducing head from the disk and a clock signal is generated in synchronism with the clock marks reproduced by the reproducing head by means of a discriminating circuit for detecting a synchronous state between the generated clock signal and the reproduced clock marks, a circuit for causing oscillation of the reproducing head in a radial direction of the disk over a plurality of tracks when the synchronous state discriminating circuit determines that the clock signal is not synchronous with the clock marks, and a phase-locked loop circuit for generating the clock signal in synchronism with the clock marks reproduced from the disk while the reproducing head is oscillated over the plurality of tracks by synchronizing on the clock marks reproduced at a variety of different radial positions on the disk
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: February 11, 1997
    Assignee: Sony Corporation
    Inventors: Itaru Tomisaki, Toru Takeda
  • Patent number: 5602689
    Abstract: A servo control system provides adaptive compensation for a variety of tracking and seek problems found in disk drives. The servo control system is ideally implemented in digital form for accuracy, speed and compactness. A first embodiment includes two modes, a tracking (or position) mode and a seek (or velocity) mode, each mode employing a variety of compensation functions. A second embodiment includes a single comprehensive control system which functions during both tracking and seek operations.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: February 11, 1997
    Assignee: Rodime PLC
    Inventors: Ronald J. Kadlec, Paul H. Kelley, Philip S. Weilbacher
  • Patent number: 5602686
    Abstract: A system for recording and reproducing data including user data on a magnetic tape having a number of partitions in which recording can be performed, the tape having at least one system zone in which user data is not recorded, the system having a table of data located near the beginning of the tape and near each system zone with the table including data identifying the physical location of the system zones and partitions and other sections of the tape.
    Type: Grant
    Filed: March 6, 1995
    Date of Patent: February 11, 1997
    Assignee: Ampex Corporation
    Inventor: Lionel C. Shih
  • Patent number: 5602814
    Abstract: A write-once read-many (WORM) optical disk recorder automatically calibrates its laser to emit a laser beam of a desired power level. While writing data to the WORM disk, a laser test signal is written to a laser checking area termed Automatic Laser Power Correction (ALPC) field. If the emitted laser test signal has a power level outside an acceptable power level window, then inappropriate laser power is indicated. Then, in an error recovery procedure (ERP) the laser power is calibrated in the data sector to be written to using short spaced-apart laser test signals. After successful calibration, data are written to the sector. The test signals appear as burst errors that can be corrected by a suitable error correction code. If such calibration is not successful then a write calibrate sector, WCS, is created and used for an extensive automatic calibration. In the WCS both laser power level is calibrated. The calibration result information is written to WCS for later use.
    Type: Grant
    Filed: October 6, 1994
    Date of Patent: February 11, 1997
    Assignee: International Business Machines Corporation
    Inventors: Glen A. Jaquette, Arturo A. Mojica
  • Patent number: 5598304
    Abstract: A fuzzy controller controls a track seeking operation and a track following operation for an actuator in accordance with a position error between a present position value and a reference value. When the actuator is in track seeking operation, the actuator is accelerated or decelerated based on a velocity error value between an actual velocity value of the actuator and a target velocity value determined from a velocity profile according to the position error. In a deceleration control of the actuator, a fuzzy inference value generated based on the velocity error value and its differentiated velocity error value is used for a control of the actuator, thereby reducing an occurrence of overshooting at a target track.
    Type: Grant
    Filed: February 2, 1995
    Date of Patent: January 28, 1997
    Assignee: Daewoo Electronics Co., Ltd.
    Inventors: Hyun-Taek Choi, Il hong Suh, Woo Sok Chang, Janghee Lee, Goonjin Kim