Patents Examined by Alfonso Garcia
  • Patent number: 5089922
    Abstract: A specially designed disc mounting spindle hub having a disc mounting flange protruding frm a substantially cylindrical hub portion. The disc mounting flange has a raised area about the periphery of the flange upon which a disc rests. The remainder of the discs are alternately stacked with spacer rings upon the first disc. A clamping ring is attached to the substantially cylindrical hub portion opposite the disc mounting flange and, working cooperatively with the flange, imparts a force upon the disc and spacer ring stack to hold the discs in place. The maximum force applied to the stack is in line with the raised peripheral ara that the first disc rests upon. Additionally, the force bends the disc mounting flange. However, the first disc pivots upon the raised area maintaining its parallel orientation with respect to the other discs.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: February 18, 1992
    Assignee: Seagate Technology, Inc.
    Inventor: Stephen P. LeClair
  • Patent number: 5086360
    Abstract: The surface of a slider for a magnetic recording head, a burnishing head, or a glide head includes a pair of rails that, in operation, face the magnetic recording medium to form air bearing surfaces. These air bearing surfaces have slots cut into them at the same prescribed angle relative to the longitudinal axis of the slider, and along a single straight line. This provides slots which are asymmetric about the longitudinal axis, causing the slider to fly nearer the recording medium and at almost constant height.
    Type: Grant
    Filed: September 6, 1990
    Date of Patent: February 4, 1992
    Assignee: Applied Magnetics Corporation
    Inventors: Paul W. Smith, Raymond S. Abbott, Peter C. Lorince, Robert K. Wood, Robert R. Lichtenberg, John J. Gaukel
  • Patent number: 5086362
    Abstract: The magnetic head has poles at each intersection of the matrix of wires. These poles connect the pads of the same column of pads, a gap being defined between the pads of the same intersection of wires and being parallel to the data wire.
    Type: Grant
    Filed: July 13, 1990
    Date of Patent: February 4, 1992
    Assignee: Thomson-CSF
    Inventor: Francois Maurice
  • Patent number: 5084794
    Abstract: An MR head includes two substantially identical MR elements, separated by an insulating layer which has shorting stubs at its ends for electrically shorting the MR elements. A current applied to the MR elements splits into two currents that flow in the same direction through the substantially identical MR elements, to provide mutual bias and to serve as sense currents for detecting change in element resistance. The MR elements are biased to operate in a magnetically unsaturated mode. This results in a "bootstrapping" of short wavelength signals that effectively amplifies the reproduced signal over a broad region of the signal spectrum when the linear spacing between the MR elements is in the range of from one half to one times the half-wavelength of signals recorded on a magnetic recording medium.
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: January 28, 1992
    Assignee: Eastman Kodak Company
    Inventor: Neil Smith
  • Patent number: 5081556
    Abstract: A disk cartridge has a casing of resinous material which receives therein a floppy disk in a rotatable manner, the casing being formed by combining upper and lower half casings with the use of connecting ribs formed on the inner surface of at least one of the upper and lower half casings. The upper and lower half casings respectively have an outer circumferential wall at the circumference of the inner surface and an annular rib at the inner portion of the outer circumferential wall so as to define a floppy disk rotating region, wherein projections are formed in the annular rib of the upper half casing. Recesses are formed in the annular rib of the lower half casing so that the projections and the recesses are fitted to each other in a non-contacting state so as to form a complete annular wall, and sealing ribs are formed on the outer surface of the annular rib of the upper half casing so as to extend over gaps formed at the fitting portion of the projections and recesses.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: January 14, 1992
    Assignee: TDK Corporation
    Inventors: Masaru Ikebe, Haruo Shiba, Morimasa Sasaki
  • Patent number: 5075888
    Abstract: A semiconductor memory device composed of a DRAM, an EEPROM, a mode switch means for selecting either mode of the DRAM mode and the EEPROM mode, and a transfer means for transferring data stored in the DRAM to the EEPROM and vice versa. The DRAM consists of one transistor and one capacitor, and one of the terminals of the capacitor is electrically isolated.
    Type: Grant
    Filed: February 9, 1989
    Date of Patent: December 24, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshimitsu Yamauchi, Kenichi Tanaka, Keizo Sakiyama
  • Patent number: 5075807
    Abstract: There is provided a magnetic recording device including recording mediums and an airtight enclosure containing the recording mediums therein and having a fine breathing hole created therethrough communicating with the outside thereof, wherein at least two types of moisture adsorbents composed of a one way type moisture adsorbent which adsorbs moisture and a reversible type moisture adsorbent which adsorbs moisture in high humidity and conversely discharges the same in low humidity are disposed in the cabinet and used in combination. There is also provided the same device except wherein gas adsorbents and moisture adsorbents are used in combination.
    Type: Grant
    Filed: March 14, 1990
    Date of Patent: December 24, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Yoichi Inoue, Katsuyuki Tanaka, Hideaki Amano
  • Patent number: 5075809
    Abstract: A magnetic head affixed to the underside of a carrier body mounted at the periphery of a head-wheel for scanning oblique tracks on a magnetic tape is provided with shielding of ferrite, mu-metal or amorphous iron, to reduce magnetic crosstalk. The shielding surrounds the part of the magnetic head that projects beyond the head carrier body except for a small portion near the polished surface that needs to be left uncovered to avoid interfering aerodynamically with the contact of the magnetic head with a magnetic tape. One piece of the shielding is of rectilinear shallow U-shaped profile, forming a pocket for the magnetic head below the carrier body and extends beyond the tip of the carrier body, where the second piece of shielding material completes an annular shielding ring around the end of the magnetic head. This shielding is particularly useful for an after-check playback head used during recording to check on the quality of the recorded signals.
    Type: Grant
    Filed: May 23, 1989
    Date of Patent: December 24, 1991
    Assignee: BTS Broadcast Television Systems GmbH
    Inventors: Richard Heinz, Hartmut Willmann, Jorn Lutzeler
  • Patent number: 5068760
    Abstract: A thin film magnetic head includes first and second head chips, each of the head chips having a substrate, a reproducing head portion and a recording head portion provided in a side edge portion on the substrate, and a protecting plate covering the reproducing head portion and the recording head portion. The reproducing head portion and the recording head portion are formed of a lower magnetic layer, an electroconductive coil layer, an upper magnetic layer and insulation layers interposed therebetween, deposited in stacked relation on the substrate one after another.
    Type: Grant
    Filed: June 19, 1989
    Date of Patent: November 26, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Tohru Kira
  • Patent number: 5068758
    Abstract: A cassette loading device for use in the tape recorder of which a door and a receiving holder is opened and closed by levers against a deck, wherein a slider of a cassette interposed between the receiving holder and the door is slidingly opened and closed by an opening and closing function of the door thereby enabling the height of the door and the receiving holder to be changeably positioned mutually with in opening and closing of the door and the receiving holder. The middle portion of the door is connected with the lower part of the deck by a third pair of lever members supported by a pair of pins; the door is connected with each lever member of the third pair of lever members supported by a pair of hinge members mounted on the lower ends of the receiving means.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: November 26, 1991
    Assignee: SamSung Electronics Co., Ltd.
    Inventor: Kwang-Moon Choi
  • Patent number: 5067038
    Abstract: A rotary magnetic head device utilizes a thin film magnetic head or heads having small mutual influence to external magnetic field in combination with a bulk magnetic head or heads to reduce crosstalk between recording head and reproducing head to thereby improve S/N ratio.
    Type: Grant
    Filed: July 5, 1990
    Date of Patent: November 19, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Toshio Tsuchiya, Mitsuo Abe, Nobuo Arai, Masumi Hisatomi, Hideo Zama
  • Patent number: 5065267
    Abstract: The multi-track head includes more than one head chip attached onto one head base. The head chips are respectively attached onto the divided front end parts of the head base, and the relative positions of the front end parts of the head base are adjusted so that the positions of the gap ends in the head chips are set precisely to a predetermined value, before the head chips are fixed. For these reasons, it is not necessary to adjust the position of each head chip after the head chips are arranged in a rotary cylinder. It is therefore possible to obtain a head having a size which can be accurately adjusted, regardless of the size of the head chip, even when the head chip is extremely small. A bonding material is provided between the divided front end parts to secure the front end parts and the chips mounted thereon in place after they have been displaced to align them with recording medium track locations.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: November 12, 1991
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Hiroshi Yohda
  • Patent number: 5065264
    Abstract: A magnetic recording/reproducing apparatus has a chassis, a rotary cylinder mounted on the chassis, and at least one guide base movably disposed around the rotary cylinder. The guide base is provided with a guide member for drawing out a magnetic tape from a tape cassette. The guide member draws out the magnetic tape from the tape cassette, as the guide base is being moved, and winds the magnetic tape around the rotary cylinder so that a predetermined tape passage is defined. The magnetic recording/reproducing apparatus further has a capstan mechanism for driving the magnetic tape to run the same. The capstan mechanism is arranged on the same side of the chassis on which the rotary cylinder is disposed, and has a capstan downwards extending toward the chassis to come into direct contact with the magnetic tape.
    Type: Grant
    Filed: February 1, 1990
    Date of Patent: November 12, 1991
    Assignees: Hitachi, Ltd., Hitachi Video Engineering, Inc.
    Inventors: Motonori Ohmori, Ikuo Nishida, Koji Iyota, Hidekazu Takeda, Masao Iwakura, Tetsuo Itou
  • Patent number: 5063467
    Abstract: A magnetic head employs a gap of magnetic material between two poles. The magnetic material of the gap has a saturation value less than the saturation value of the poles. When the gap material is not saturated, the magnetic field remains contained within this gap.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: November 5, 1991
    Assignee: Thomson-CSF
    Inventors: Joseph Colineau, Jurgen Machui
  • Patent number: 5060104
    Abstract: A rotary head device for a recording and reproducing apparatus includes a rotary drum and a stationary drum. The rotary drum has a guide surface formed of a conical surface coaxial with the axis of rotation of the rotary drum and wound with a magnetic tape. A head unit is mounted on the rotary drum to be rotatable integrally therewith. The head unit includes two head elements facing each other, for scanning the tape wound on the guide surface, while the tape is being interposed between the head elements, as the rotary drum rotates.
    Type: Grant
    Filed: July 27, 1990
    Date of Patent: October 22, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shoji Kitaori, Shigeo Kizu
  • Patent number: 5055949
    Abstract: In a floppy disk drive, a disk driving mechanism is controlled by a disk drive controller so as to rotate a floppy disk for a predetermined time when the floppy disk is loaded into the disk drive. Thereby, dust adhering to the surface of the floppy disk can be removed with a cleaning liner in a cartridge containing the floppy disk. In addition, a magnetic head is brought into contact with a storage medium being stopped by the disk drive controller after dust adhering to the surface of the storage medium has been removed.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: October 8, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Chikahisa Kawakami
  • Patent number: 5055953
    Abstract: A cassette holder holds a cassette, and is disposed to be substantially horizontally movable. A loading mechanism includes a guide member for guiding the cassette holder to load or unload the cassette, and a worm wheel for driving the guide member. A worm unit includes a worm, having first and second ends, meshed with the worm wheel, a rotating member coaxially mounted to the first end of the worm, and thrust and radial bearings coaxially mounted between the worm and the rotating member, the worm being driven in accordance with a transmission of rotation from a drive source to the rotating member. A mounting mechanism, to which the worm unit is mounted, includes a first elastic support member for elastically supporting the second end of the worm, and a second elastic support member for elastically supporting the radial bearing.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: October 8, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuzo Tsuchiya
  • Patent number: 5051956
    Abstract: A memory cell is provided comprising a bistable latch (I1, I2) having first and second nodes (NODE 1, NODE 2) and a nonvolatile transistor (NV1). The control gate of the nonvolatile transistor is connected to the first node and either the source or drain is connected to the second node. A switching transistor is provided for maintaining the control gate and the substrate of the nonvolatile transistor at substantially the same potential during volatile operation of the latch, thereby reducing voltage stress which would lead to charge tunnelling to or from the floating gate. In this way, disturbance of the floating gate charge is avoided during volatile operation. The cell is particularly suited to silicon gate fabrication technology.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: September 24, 1991
    Assignee: Hughes Microelectronics Limited
    Inventor: Daniel Burns
  • Patent number: 5050024
    Abstract: A double base type double azimuth magnetic head including two head bases and a pair of head chips bonded and anchored thereto respectively. The two head bases integrally have anchor lugs with flat reverse surfaces for anchoring the head chips thereto. The head bases further have joint regions partially and are joined to each other at the surfaces of the joint regions in such a manner that the anchor lugs are placed mutually adjacent in the same direction and the reverse surfaces of the anchor lugs become flush with each other. The pair of anchored head chips are so disposed as to constitute a double azimuth head while being positioned mutually adjacent on one line with a predetermined gap left therebetween, and screw-setting circular apertures are formed in the joined head bases for attachment to a rotary drum. Due to such a structure, the operation of winding coils around the head chips can be automated, and the dimensional precision is enhanced.
    Type: Grant
    Filed: January 29, 1990
    Date of Patent: September 17, 1991
    Assignee: Sony Corporation
    Inventor: Shinichi Nanjyo
  • Patent number: 5047883
    Abstract: A pantographic head mount includes a pair of generally parallel flexible arms each solidly based at an inboard end and solidly affixed at an outboard end to a rigid structure that carries a magnetic head and is driven by an electromagnetic motor positioned to hold the head continuously normal to a recording medium while traversing across the medium. The structure is particularly adapted to resist torsional deformation. The two arms may be structured to have different resonant frequencies, and beating resonance between the arms during high-speed operation is avoided. However, in such case, the structures of the two arms are carefully matched to ensure that they still maintain the head continuously normal to the recording medium. In another embodiment, the arms have differently reticulated structural configurations to present incongruent but equal-area cross-sections at various points along the arm lengths.
    Type: Grant
    Filed: February 7, 1990
    Date of Patent: September 10, 1991
    Assignee: Ampex Corporation
    Inventors: William N. Aldrich, Sidney D. Miller