Patents Examined by John H. Wolff
  • Patent number: 5949622
    Abstract: A magnetoresistance effect element provided with a spin valve film composed of a first magnetic layer formed on a metallic buffer layer, a middle non-magnetic layer formed on the first magnetic layer, and a second magnetic layer formed on the non-magnetic layer, has an atomic-diffusion barrier layer whose average thickness is 2 nm or less formed in the interface between the metallic buffer layer and the first magnetic layer. Or a magnetoresistance effect element provided with a spin valve film composed of a first magnetic layer composed of a laminated film of a magnetic undercoat layer and a ferromagnetic layer, a middle non-magnetic layer formed on the first magnetic layer, and a second magnetic layer formed on the middle non-magnetic layer, has an atomic-diffusion barrier layer whose average thickness is 2 nm or less formed in the interface between the magnetic undercoat layer and the ferromagnetic layer.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: September 7, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuzo Kamiguchi, Akiko Saito, Kazuhiro Saito, Hideaki Fukuzawa, Hitoshi Iwasaki, Masashi Sahashi
  • Patent number: 5946161
    Abstract: A disk storage has one or more disks provided with center holes. An electric motor extends coaxially through these holes and has an external rotor to the outer circumference of which the disks are secured so that they rotate with the rotor. A labyrinth seal is provided for at least reducing the escape of contaminants from the motor.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: August 31, 1999
    Assignee: Papst Licensing GmbH
    Inventor: Bernhard Schuh
  • Patent number: 5946162
    Abstract: A DD motor in a magnetic disk drive is disclosed. The DD motor comprising a sheet of metal plate formed in a two-stage disk-shaped, which includes an upper stage portion having an opening at the center thereof and a lower stage portion provided continued from the upper stage portion, a spindle shaft served as a central axis of the DD motor and inserted into the opening of the upper stage portion, and a resin portion formed integrally on a top face and a back face of the upper stage portion, in which magnetic material powder is mixed, wherein the resin portion connects the spindle shaft and the metal plate uniformly. Central axes of the small diameter disk-shaped upper stage portion and the large diameter disk-shaped lower stage portion are located coaxially. A peripheral edge of the upper stage portion is bent downwards to form a rim.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: August 31, 1999
    Assignee: Mitsumi Electric Co, Ltd.
    Inventors: Makoto Konno, Hisashi Shibata, Koichi Seno
  • Patent number: 5943303
    Abstract: A chassis has rotatably mounted thereon a magazine for accommodating a plurality of disks as positioned upright. A playback portion and an insertion-discharge portion are arranged respectively inside and outside the magazine radially thereof. Roller units for holding and transporting the disk are provided between the insertion-discharge portion and the magazine and between the magazine and the playback portion, respectively. The roller units are coupled together by a train of gears and driven by a motor M3 to rotate in directions opposite to each other. Control apparatus is disposed within the device main body for energizing the motor M3 for a specified period of time before the magazine is rotated to rotate the roller units in directions to draw the disk into the magazine.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: August 24, 1999
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Tadahiro Mitani, Keiji Hirao, Hitoshi Ogata, Masanao Yoshida
  • Patent number: 5940255
    Abstract: In a large-capacity flexible disk having a case accommodating a magnetic disk medium, the case is provided with a single large-capacity identifier hole formed in the vicinity of a write protection hole to discriminate the large-capacity flexible disk from a small-capacity flexible disk. The large-capacity flexible disk is one of a plurality of types having storage capacities different from one another. The case is further provided with type identifier holes selectively formed to identify the type of the large-capacity flexible disk so that the type of the large-capacity flexible disk can be identified with reference to the number and the position of the type identifier holes. A high-density type flexible disk drive, moreover, is provided with a large-capacity detecting switch at a position corresponding to the large-capacity identifier hole.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: August 17, 1999
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Tsuneo Uwabo, Yoshihiro Okano, Eiichi Yoneyama, Yoshinori Tangi
  • Patent number: 5940248
    Abstract: A first and second rotary members are supported on a holder 3 secured to a main chassis of disk drive apparatus. The first rotary member includes a detecting portion. The second rotary member includes a contact portion that moves in and out of the insertion path of a disk cartridge to be inserted into the holder. When the disk cartridge is being inserted, an opening-and-closing pin opens the shutter of the disk. Through the detecting portion, the opening shutter rotates the first rotary member, which then rotates the second rotary member to thereby move the contact portion of the second rotary member out of the insertion path of the disk cartridge, allowing the disk cartridge to be inserted. If the shutter fails to open when the disk cartridge is being inserted, the contact portion of the second rotary member will remain in the insertion path and block the insertion of the disk cartridge.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: August 17, 1999
    Assignee: Alps Electric Co., Ltd.
    Inventors: Osamu Shigenai, Masao Ohkita, Daijo Shibata, Yuji Inada, Makito Takigawa, Toru Sawada
  • Patent number: 5940243
    Abstract: A cartridge direct entry/exit station for a library apparatus, the library apparatus transferring selected cartridges to a drive unit through a transferring mechanism for processing of information recorded therein. The cartridge direct entry/exit station is configured to accommodate a magazine storing a plurality of cartridges, thereby facilitating the simultaneous entry or exit of plural cartridges. The cartridge direct entry/exit includes a communication space defined to establish direct communication between an operating space in the interior of the library apparatus and an external space of the library apparatus, and a magazine holding mechanism for holding the magazine in a state where an insertion/removal side of the cartridges faces the operating space.
    Type: Grant
    Filed: February 10, 1998
    Date of Patent: August 17, 1999
    Assignee: Fujitsu Limited
    Inventors: Toshihito Kanetsuku, Kenichi Utsumi, Takahisa Miyamoto, Tomoyuki Okada, Yuji Katoh, Osamu Ohmori
  • Patent number: 5940250
    Abstract: A dual element head is provided that includes a read element and a separate write element, wherein the read width of the read element is greater than the write width of the write element. The head also includes an erase notch for creating an erase strip along the edge of data written by the write element during a write operation. The width of the erase strip is optimized so that undesired data on the track, that could otherwise be read by the wider read element during a subsequent read operation, is removed during the write operation.
    Type: Grant
    Filed: October 21, 1997
    Date of Patent: August 17, 1999
    Assignee: Maxtor Corporation
    Inventors: Michael McNeil, Harlan Mathews
  • Patent number: 5940253
    Abstract: The pole pieces of a thin film head are formed by two thin film layers of the magnetic metal NiFe, each NiFe layer being about 20,000 angstroms thick. These two NiFe layers are separated by an electrically insulating layer of alumina (Al.sub.2 O.sub.3), ceramic or NiFe oxide that is about 100 angstroms thick. In one embodiment, a hard-baked photoresist layer is formed only around the edges of the first NiFe layer, the electrically insulating layer is deposited over the top surface of the first NiFe layer and over the hard-baked photoresist layer, and the second NiFe layer is then deposited, thus providing a three-layer metal/insulator/metal pole piece wherein the hard baked photoresist blocks edge short circuiting between the two thin film NiFe layers.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: August 17, 1999
    Assignee: Quantum Corporation
    Inventors: Michael Mallary, Kofi Gyasi
  • Patent number: 5936796
    Abstract: A library apparatus including a feeder mechanism for an accessor robot. The feeder mechanism includes a feeding cable for the accessor robot. The feeding cable has a first end and a second end. The first end is connected to the accessor robot, and the second end is connected to a reference position (e.g., a housing of the library apparatus). The feeding cable is wrapped around a cable drum. The cable drum is rotatably supported to an arm. A wire rope acts on the arm to apply a tension to the feeding cable. A stress removing mechanism for removing a torsional stress of the wire rope is connected to at least one end of the wire rope. The stress removing mechanism rotatably supports the wire rope. With this configuration, the torsional stress of the wire rope is removed to thereby improve fatigue characteristics or the like of the wire rope and accordingly improve the reliability of the library apparatus.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: August 10, 1999
    Assignee: Fujitsu Limited
    Inventor: Mamoru Haneda
  • Patent number: 5933405
    Abstract: An actuator for a digital versatile disc player which includes a lens holder to which object lenses are mounted, a tracking coil which is attached to an outer surface of the lens holder for tracking the lens holder, a focusing coil which is attached to the outer surface of the lens holder for focusing the lens holder, a yoke plate which magnetically interacts with the tracking and focusing coils, and supporting portions which movably support the lens holder, and to which the yoke plates are mounted. The supporting portions include a plurality of magnets and a pair of suspension plates, and the lens holder is floated with respect to the yoke plate by repelling forces between the magnets. The tracking and focusing functions are smoothly accomplished and external impacts are effectively absorbed by the floating of the suspension plates which support the lens holder.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: August 3, 1999
    Assignee: Daewoo Electronics Co., Ltd.
    Inventor: Ki-Seok Song
  • Patent number: 5930087
    Abstract: A robust recording head with a spin tunneling sensing element separated from an interface between the recording head and a recording media so as not to be affected by collisions and other ill effects at the interface between the recording head and the recording media. The spin tunneling sensing element includes a pair of magnetic elements wherein one of the magnetic elements functions as a flux guide that conducts magnetic flux emanating from the recording media away from the interface to an active area of the spin tunneling sensing element.
    Type: Grant
    Filed: November 20, 1997
    Date of Patent: July 27, 1999
    Assignee: Hewlett-Packard Company
    Inventors: James A. Brug, Manoj K. Bhattacharyya, Lung T. Tran, Thomas C. Anthony
  • Patent number: 5923503
    Abstract: A longitudinal bias layer and an electrode layer are formed on a non-magnetic material layer. The longitudinal bias layer and the electrode layer are partially removed by an etching technique so that a narrow gap defining the track width Tw is formed in the longitudinal bias layer and the electrode layer. Furthermore, a three-layer film consisting of, from bottom to top, a magnetoresistance effect layer, a non-magnetic layer, and a transverse bias layer, or otherwise a spin valve film consisting of a free magnetic layer, a non-magnetic layer, a fixed magnetic layer and a bias layer is formed on the above structure. The three-layer film or the spin valve film is then partially removed by an etching technique so that the three-layer film or the spin valve film remains only in the above-described narrow gap formed in the longitudinal bias layer and the electrode layer.
    Type: Grant
    Filed: March 14, 1996
    Date of Patent: July 13, 1999
    Assignee: Alps Electric Co., Ltd.
    Inventors: Kiyoshi Sato, Yoshihiko Kakihara, Masamichi Saito, Toshihiro Kuriyama, Toshinori Watanabe
  • Patent number: 5917676
    Abstract: A vibration control device for controlling vibration of a disc drive supported in a compartment of a mass storage array. Disc drives stored in a compartment of a mass storage array may move within the compartment during operation of the mass storage array. Movement of a disc drive in a compartment may affect the performance of the disc drive to retrieve data from and write data to selected data tracks of a disc. In particular, vibration along an extent of the disc drive aligned with an operational stroke of the actuator mechanism may skew the operational stroke of the disc heads supported via the actuator mechanism. The vibration control device includes a spring which is adapted to exert a biasing force to a disc drive inserted into a compartment to restrict movement of the disc drive within the compartment.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: June 29, 1999
    Assignee: Seagate Technology, Inc.
    Inventor: Theodore R. Browning
  • Patent number: 5917685
    Abstract: A disk cartridge includes a cartridge main body with a shutter-guide-plate mount, a shutter slidably mounted to the cartridge main body, a shutter guide plate mounted to the shutter-guide-plate mount to guide sliding of a pointed end of the shutter, and an adhesive placed between the shutter-guide-plate mount and the shutter guide plate. The adhesive is 10% or less in volume difference between the melted and solidified states.
    Type: Grant
    Filed: October 21, 1997
    Date of Patent: June 29, 1999
    Assignee: Sony Corporation
    Inventors: Shuichi Kikuchi, Takatsugu Funawatari
  • Patent number: 5914831
    Abstract: A bezel (100) mitigates cartridge over ejection from a tape drive, the tape drive receiving and ejecting a cartridge of magnetic tape for performing recording and reading operations with respect to the magnetic tape. The bezel (100) comprises both a bezel plate (102) and a pair of cartridge braking projections (120) attached thereto. The cartridge braking projections partially extend into a cartridge slot (104) and retard motion of a cartridge travelling through the slot. The cartridge braking projections (120) are resilient and bidirectionally flexible, preferably being formed of cellular urethane. The cartridge braking projections (120) extend into the slot by a predetermined distance above a lower cartridge plane (115). In one embodiment, the bezel (100) is attached to a rack which accommodates the tape drive.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: June 22, 1999
    Assignee: Exabyte Corporation
    Inventors: Ronald L. Lass, David M. Romig, Daniel W. Hoekstra
  • Patent number: 5914838
    Abstract: Magnetic head having a head face (1) and comprising a multilayer structure with a flux guide (7a, 7b), a magnetoresistive sensor (9) and an intermediate layer (13) present between the flux guide and said sensor. The intermediate layer comprises an anti-ferromagnetic oxide which insulates the sensor from the flux guide and also magnetically biases the sensor.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: June 22, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Jacobus J. M. Ruigrok, Pieter J. van der Zaag
  • Patent number: 5914833
    Abstract: A floating type head slider used in a disc drive using a disc-shaped recording medium, and adapted to float from the disc-shaped recording medium when the disc-shaped recording medium is rotationally operated.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: June 22, 1999
    Assignee: Sony Corporation
    Inventors: Michio Yotsuya, Kazushige Kawazoe, Kanzo Okada
  • Patent number: 5912789
    Abstract: A cramping structure of a guide bar for a head carriage in a magnetic disk drive is disclosed. The structure comprises a head carriage, a guide bar provided in parallel to the head carriage, a guide bar cramp provided along the guide bar in opposite side of the head carriage, wherein the head carriage includes a long plate-like base and a pair of cramp arms having a slit respectively, and extending from both ends of the base to the side of the guide bar which faces to the head carriage such that the cramp arm covers above of the guide bar; and a pair of engaging pieces provided under the pair of cramp arms respectively, wherein the pair of engaging pieces respectively includes a projection engaging the slit of the cramp arm and a notch supporting the guide bar from below thereof, wherein the pair of cramp arms urges the guide bar downwards, and the urging forces are received by the pair of notches of the engaging pieces.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: June 15, 1999
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Makoto Konno, Hisashi Shibata, Koichi Seno
  • Patent number: 5912790
    Abstract: A composite magnetic head includes a recording head and a reproducing head. The recording head may be formed below or above the reproducing head. The lower of the recording and reproducing heads includes a first electrode. In addition, a conductive layer acting as a pole structure for the recording head includes a portion defining a hole through which a second electrode is made to contact the first electrode.
    Type: Grant
    Filed: March 13, 1997
    Date of Patent: June 15, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroaki Yoda, Akio Hori, Michiko Hara, Naoyuki Inoue, Yuichi Ohsawa, Susumu Hashimoto, Takeo Sakakubo, Norio Ozawa, Teruo Sasho