Patents Examined by A. J. Heinz
  • Patent number: 7369363
    Abstract: A method for producing a magnetic tape and method for improving a winding form of the magnetic tape are provided. These methods comprises a stage for winding a magnetic tape around a tape reel; and a stage for thermally treating the magnetic tape wound around the tape reel under preset thermal treatment conditions to impart the magnetic tape to winding habit. In the winding state, the magnetic tape is wound around a tape reel whose hub circumference is formed into a tapered state in the stage for winding a magnetic tape.
    Type: Grant
    Filed: January 25, 2005
    Date of Patent: May 6, 2008
    Assignee: FUJIFILM Corporation
    Inventor: Kyohisa Uchiumi
  • Patent number: 7369359
    Abstract: A thin film magnetic head having a high write-in accuracy can be produced by suppressing a magnetic field leak between upper and lower magnetic poles. The method of producing the thin film magnetic head, in which a head substrate, magnetoresistance effect element, lower magnetic pole, write gap layer and an upper magnetic pole are formed in this order, has the lower magnetic pole patterned with a larger width than that of the upper magnetic pole in a write magnetic pole after the lower magnetic pole is formed. An insulation layer is formed in the same layer as the lower magnetic pole such that the insulation layer is flattened with the lower magnetic pole. The upper magnetic pole is formed on a surface of the write gap layer after the write gap layer is formed, and a protrusion of the lower magnetic pole is removed from a side face thereof.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: May 6, 2008
    Assignee: Fujitsu Limited
    Inventors: Mutsumi Fujita, Takashi Ito
  • Patent number: 7363641
    Abstract: An aligning device for a disk recording medium capable of reducing eccentricity using a simple structure, without an increase in cost, is provided. An aligning member has a tapered portion that contacts with a center hole of a disk, and fits with a guide portion that is fixed to a turntable with a sliding gap therebetween. The sliding gap between the aligning member and the guide portion is formed such that a leading end side sliding gap of the turntable in the sliding direction of the aligning member differs from a trailing end side sliding gap of the disk side in the sliding direction. The leading end side sliding gap is formed smaller than the trailing end side sliding gap. The amount of eccentricity of the disk becomes smaller according to this structure.
    Type: Grant
    Filed: October 5, 2004
    Date of Patent: April 22, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shinnosuke Torii
  • Patent number: 7362547
    Abstract: A magnetic head having an improved PtMn layer formed by ion beam deposition, an antiparallel (AP) pinned layer structure formed above the PtMn layer, and a free layer formed above the AP pinned layer structure. The spin valve structure provides improved soft magnetic properties of the free layer as well as increases the dR/R of spin valve structures in which implemented.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: April 22, 2008
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: James Mac Freitag, Mustafa Michael Pinarbasi
  • Patent number: 7359160
    Abstract: In general, the invention provides a magnetic head device and linear tape drive that increase the resonant frequency and the range of a servo system. In particular, the invention provides a magnetic head device comprising a magnetic head chip with multiple magnetic head elements that is a structural part of the fine positioning system which allows the magnetic head elements follow the data tracks on the linear magnetic tape. Consequently, weight is reduced thereby increasing the resonant frequency and servo bandwidth. In another embodiment, the invention provides a magnetic head comprising bimodal actuators that are formed into an S shape and displaced by applying voltage where the polarization direction is opposite from one end to the other. In particular, the head chip may remain stable and may be driven dynamically thereby allowing the mechanical resonance of the bimodal actuator (including the head chip) to increase to 1 kHz or higher.
    Type: Grant
    Filed: January 24, 2005
    Date of Patent: April 15, 2008
    Assignees: Imation Corp., Sony Corporation
    Inventors: Hirohisa Koga, Takashi Abe, Yoshihiko Ito, James S. Anderson, Denis Langlois
  • Patent number: 7359161
    Abstract: A magnetic sensor is provided. The magnetic sensor includes a magnetoresistive multi-layered portion that has a first resistance region and a second resistance region. At least two contacts are coupled to the magnetoresistive multi-layered portion. A sensing current flows from a first contact of the at least two contacts to a second contact of the at least two contacts via the first resistance region and the second resistance region of the magnetoresistive multi-layered portion. The first resistance region promotes a primary flow of the sensing current in a first direction substantially perpendicular to surface planes of the layers of the magnetoresistive multi-layered portion, and the second resistance region promotes the primary flow of the sensing current in a second direction substantially in parallel to surface planes of the layers of the magnetoresistive multi-layered portion.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: April 15, 2008
    Assignee: Seagate Technology LLC
    Inventors: Shaoping Li, Song Xue, Kaizhong Gao, Michael R. Montemorra, Patrick Ryan
  • Patent number: 7352536
    Abstract: A pivot shaft fixing structure of a data storage device includes a projection hole formed through a top surface of a pivot shaft that rotatably supports an actuator. In addition, a projection protrudes from a bottom surface of a cover member and fits into the projection hole. Furthermore, a deformable member is disposed around at least a portion of the projection and is disposed between the bottom surface of the cover member and the top surface of the pivot shaft. The pivot shaft fixing structure is advantageously applied within a hard disk drive.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: April 1, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Myung-Il Kim
  • Patent number: 7349179
    Abstract: A magnetic write head provides a significant write field and minimal adjacent track erasure, and lends itself to improved manufacturability. The write head includes a pedestal throat height that defines a bottom pole, P1, and that is substantially recessed from the air bearing surface. The write head further includes a top pole, P2, that defines a nose that is closer to the air bearing surface than the pedestal zero throat. This design achieves a relatively high ratio of the off-track to on-track field. As an example, a 1:4 ratio could be achieved to significantly mitigate the erasure problem of the adjacent tracks resulting from magnetic flux saturation.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: March 25, 2008
    Assignee: Western Digital (Fremont), LLC
    Inventors: Qing He, David John Seagle, Loi Dac Pham, Marcos Moises Lederman
  • Patent number: 7350217
    Abstract: A disk drive device is arranged so as to swing a traversing mechanism which has an optical pickup and a spindle motor mounted thereon. In a shift mechanism of the optical pickup, its outer end in the radial direction of the optical disk is provided to extend beyond a periphery of the optical disk, and in loading, the optical pickup is caused to withdraw to the outer end which is provided to extend. Therefore, as to the optical pickup which is thicker than the spindle motor and determines the thickness of the whole device, the amount of swing of the pickup is decreased while reliably avoiding the contact between the pickup and the optical disk, thus realizing the reduction in thickness of the device. As a result, it is possible to realize front loading of the optical disk at low cost.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: March 25, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Nobuyuki Kajita
  • Patent number: 7349180
    Abstract: First, second and third pole tip components of a write head are formed with the second pole tip located between the first and third components and a write gap layer located between the first and second pole tip components. The second pole tip is formed with a width that defines a track width of the write head. The third pole tip component is formed with top and bottom surfaces wherein the bottom surface interfaces a top surface of the second pole tip component and has a width equal to the track width and wherein the top surface of the third pole tip has a width greater than the track width.
    Type: Grant
    Filed: December 2, 2004
    Date of Patent: March 25, 2008
    Assignee: International Business Machines Corporation
    Inventors: Jyh-Shney (Jerry) Lo, Timothy J. Moran
  • Patent number: 7345853
    Abstract: A device according to one embodiment includes an electronic component such as an MR sensor, a pair of leads operatively coupled to the electronic component, and shorting material between the leads, the shorting material having been applied by a laser deposition process, the shorting material having been severed. A magnetic storage system according to another embodiment includes magnetic media; and at least one head for reading from and writing to the magnetic media, each head having: a sensor; and a writer coupled to the sensor. The system also includes a pair of pads or leads operatively coupled to the head; shorting material between the leads, the shorting material having been applied by a laser deposition process, the shorting material having been severed; a slider for supporting the head; and a control unit coupled to the head for controlling operation of the head.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: March 18, 2008
    Assignee: Hitachi Global Storage Technologies Netherlands B. V.
    Inventors: Meng Ding, Surya Narayan Pattanaik, Chie Ching Poon, Neil Leslie Robertson
  • Patent number: 7343612
    Abstract: A cartridge main body formed by aligning and bonding a pair of an upper half and a lower half rotatably contains an optical disc. The cartridge main body is provided on one of the opposite surfaces thereof with a central aperture, which is a drive aperture for receiving a drive means for driving the optical disc to turn, and a head receiving aperture, which is a recording and/or reproduction aperture for receiving a recording and/or reproduction means. A shutter member is fitted to the cartridge main body. The shutter member has a shutter section for exposing and closing the heard receiving aperture and is adapted to move to expose and close the head receiving aperture while it is supported at the base thereof within a range of one of the lateral sides thereof that is perpendicular to the above mentioned surface of the cartridge main body.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: March 11, 2008
    Assignee: Sony Corporation
    Inventor: Takashi Ohgi
  • Patent number: 7342744
    Abstract: Disclosed herein is a disk recording and/or reproduction apparatus including, a chassis, a recording and/or reproduction means provided on the chassis so as to perform recording and/or reproduction on a disk cartridge, a cartridge holder movably provided on the chassis to be movable between an insertion/draw-out position for inserting and drawing out the disk cartridge and a recording/reproduction position for recording and/or reproduction on the disk cartridge, an eject lever movably provided on the chassis to be moved between a loading operation finish position for making contact with the disk cartridge when a loading operation for loading the disk cartridge into the cartridge holder is finished and an ejecting operation finish position for making contact with the disk cartridge when an ejecting operation for ejecting the disk cartridge is finished, and a biasing means for biasing the eject lever toward the ejecting operation finish position; wherein the eject lever has a contact portion for contact with th
    Type: Grant
    Filed: April 25, 2005
    Date of Patent: March 11, 2008
    Assignee: Sony Corporation
    Inventors: Mikinori Matsuda, Kazuhito Kurita, Takahiro Yamada
  • Patent number: 7342751
    Abstract: The magnetoresistive effect element comprises an electrode layer 12 of a crystalline material; a base layer 14 of a conductive amorphous material formed over the electrode layer 12, an antiferromagnetic layer 18 of a crystalline material formed over the base layer 14, a ferromagnetic layer 20 formed over the antiferromagnetic layer 18 and having the magnetization direction defined by the antiferromagnetic layer 18, a nonmagnetic intermediate layer 22 formed over the ferromagnetic layer 20, a ferromagnetic layer 24 formed over the nonmagnetic intermediate layer 22 and having the magnetization direction changed by an external magnetic field, and an electrode layer 28 formed over the ferromagnetic layer 24.
    Type: Grant
    Filed: March 3, 2005
    Date of Patent: March 11, 2008
    Assignee: Fujitsu Limited
    Inventors: Keiichi Nagasaka, Yutaka Shimizu, Atsushi Tanaka
  • Patent number: 7339765
    Abstract: There are provided a slider and a magnetic disk unit that can significantly reduce a variation in flying height caused by an air pressure change even if the size of the magnetic disk unit or the slider is small.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: March 4, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Susumu Takagi
  • Patent number: 7339768
    Abstract: In general, the invention provides a magnetic head device and linear tape drive that widen the high frequency side of the servo range. In particular, the invention provides a magnetic head device comprising a magnetic head chip with multiple magnetic elements arranged for recording or playback of multiple tracks and a fine positioning structure that uses a bimodal construction that may widen the high frequency side of the servo range by increasing the resonant frequency of the magnetic head chip including the tracking structure and lowering the Q value of the resonance point. In addition, the invention includes a damping structure suitable for the fine positioning structure that improves high speed response by widening the range in which the magnetic head device can be used for a servo. The magnetic head device may use a linear tape drive method.
    Type: Grant
    Filed: January 24, 2005
    Date of Patent: March 4, 2008
    Assignees: Imation Corp., Sony Corporation
    Inventors: Yoshihiko Ito, Hirohisa Koga, Takashi Abe, James S. Anderson, Denis Langlois
  • Patent number: 7339764
    Abstract: A method of designing a patterned magnetic recording medium including a magnetic film with perpendicular magnetic anisotropy which is patterned into dots form includes steps of setting values to dot pattern periods Px and Py, a thickness “t”, a thermal stability factor Kn, a minimum inter-dot spacing S0, and a maximum recording field Hm, setting an initial value of a saturation magnetization Ms, finding a nucleation field for magnetization reversal Hn and estimating a coercivity Hc and a saturation field Hs, and repeating the steps given above so as to make the saturation field Hs lower than the maximum recording field Hm, thereby determining the magnetic properties Ms, Hn and Hc satisfying a desired condition.
    Type: Grant
    Filed: March 22, 2007
    Date of Patent: March 4, 2008
    Assignees: Japan Science and Technology Agency, Akita Prefecture
    Inventors: Naoki Honda, Kazuhiro Ouchi
  • Patent number: 7336444
    Abstract: Vibrations in a magnetic head assembly equipped with a magnetic head, caused by the effects of the flow of air arising from the high-speed rotation of a magnetic disk, can be suppressed by affixing a damping material to the magnetic head assembly. As a result, accurate positioning is possible with high reliability, the frequency of occurrence of errors during data recording and playback can be suppressed, high data transfer rates can be maintained, and high recording densities for a magnetic disk device can be realized.
    Type: Grant
    Filed: May 26, 2005
    Date of Patent: February 26, 2008
    Assignee: Fujitsu Limited
    Inventors: Takuma Kido, Tomoo Sukagawa, Keiji Aruga
  • Patent number: 7336441
    Abstract: A planar top yoke in a magnetic write head is disclosed. The top yoke includes a backside region and a second pole tip region that is thinner than the backside region and forms a step at the ABS. Alternatively, a front section of the backside region includes a step with a thickness greater than the second pole tip region. Therefore, flux is directed from a thicker backside region toward the gap side of the second pole tip layer near the ABS. A lower flux density is formed at the top of the step at the ABS which reduces the flank field/gap field ratio and prevents unwanted erasure of adjacent data tracks. A high gap field is achieved while maintaining a low flank field during high write current conditions. The step recess from the ABS toward the backside region is about 0.2 to 2 microns.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: February 26, 2008
    Assignee: Headway Technologies, Inc.
    Inventor: Kenichi Takano
  • Patent number: 7333303
    Abstract: Provided is a magnetoresistive device capable of stably maintaining sufficient output characteristics even under a higher temperature environment while responding to a demand for a higher recording density. The magnetoresistive device comprises an MR film including a fixing layer made of IrMn, an outer pinned layer of which the magnetization direction is fixed in a +Y direction by the fixing layer, and an inner pinned layer of which the magnetization direction is fixed in a ?Y direction by the fixing layer, a pair of conductive lead layers and a constant current circuit which flows a sense current in a +X direction so as to generate a current magnetic field toward a ?Y direction in the inner pinned layer, and in the magnetoresistive device, a conditional expression (1) is satisfied.
    Type: Grant
    Filed: December 29, 2004
    Date of Patent: February 19, 2008
    Assignee: TDK Corporation
    Inventors: Koji Shimazawa, Yoshihiro Tsuchiya, Kenji Inage