Patents Examined by Robert S. Topper
  • Patent number: 6614621
    Abstract: An upper auxiliary magnetic pole is formed in a space on a lower magnetic pole layer. A first insulating layer is then formed over the surface of the lower magnetic pole layer. The upper auxiliary magnetic pole is embedded within a swell formed on the surface of the first insulating layer. A second insulating layer is then formed over the surface of the first insulating layer. The second insulating layer has a property less abrasive than the first insulating layer. The second insulating layer is subjected to grinding over a wider area just after the swell has completely been removed. The abrasion can be suppressed at the thin film magnetic head in which the swell has been removed. The first insulating layer of a predetermined thickness reliably remains in each of the thin film magnetic heads on the wafer. An accurate adjustment of the thickness of the first insulating layer leads to a reliable establishment of a predetermined thickness in the upper auxiliary magnetic pole with less error.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: September 2, 2003
    Assignee: Fujitsu Limited
    Inventors: Masahiro Kakehi, Hiroshi Maeda, Takashi Sekikawa
  • Patent number: 6590743
    Abstract: In a head protection mechanism (50) for protecting a magnetic head (31) so that a coupled portion of a reader tape (71) is not in contact with the magnetic head, a protection arm (51) is rotatably mounted on a main surface of a chassis (12) close to an actuator assembly (20). The protection arm has a tape passing groove (51a) and an arm portion (514). Rotatably mounted on a back surface of the chassis, a protection lever (54) has one end (541) which is close to a ring cam (62) and which is engageably disposed to a cam face (621). The protection lever has another end (542) which is coupled to a tip (514a) of the arm portion in the protection arm via a hole (12c) bored in the chassis. A spring (53) always urges the protection arm nearer to the actuator assembly.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: July 8, 2003
    Assignee: Mitsumi Electric Co., Ltd.
    Inventor: Ikuichiro Nawa
  • Patent number: 5189572
    Abstract: A magnetic transducer has a transducing gap that is wider than that used for transferring information signals with respect to a magnetic record medium. A magnetic control flux is applied to the transducer to enable a selected segment of the transducing gap, which defines a transducing zone, for transferring information signals with respect to a selected path along the magnetic record medium. Registration of the transducing zone over the selected path is maintained by varying the applied magnetic control flux to thereby move the transducing zone along the wider transducing gap so as to compensate for deviations between the path traced by the transducing zone over the magnetic record medium and the selected path.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: February 23, 1993
    Assignee: Ampex Corporation
    Inventor: Beverley R. Gooch
  • Patent number: 4656547
    Abstract: There is provided a structure of a composite type magnetic head and its manufacturing method. The composite type magnetic head comprises: two high permeability ferrite blocks with projections having nearly edged sections formed thereon; magnetic films having a high saturation flux density deposited on the side faces of the projections, the magnetic films confronting each other via a functional gap near front ends of said projections; guard films deposited over the magnetic films comprising a non-magnetic material; and non-magnetic materials filled on the guard films up to side face of the coil. This magnetic head exhibits excellent recording and reproducing characteristics. The contour effect is negligibly small. The reaction between the magnetic film and the non-magnetic material is prevented by the guard film.
    Type: Grant
    Filed: May 9, 1984
    Date of Patent: April 7, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Noriyuki Kumasaka, Hideo Fujiwara, Shigekazu Otomo, Takeo Yamashita, Shinji Takayama, Noritoshi Saito, Mitsuhiro Kudo
  • Patent number: 4323938
    Abstract: A recording apparatus in which the cantilevered arm supporting a recording device has a smoothly curved surface adjacent the flexure spring joining the arm to a carriage whereby a rolling pivot is provided such that the bending stress on the flexure spring is minimized and is constant and independent of the degree that the cantilevered arm is raised. An end of the cantilevered arm is held against the carriage by a spring, one end of which is coupled to a translation mechanism which permits the recording device load force to be adjusted.
    Type: Grant
    Filed: May 23, 1980
    Date of Patent: April 6, 1982
    Assignee: Xerox Corporation
    Inventor: Herbert E. Thompson
  • Patent number: 4155106
    Abstract: A magnetic head having one or more magneto-electric converting elements, such as Hall elements, and comprising plural leads which are used, when the magnetic head is manufactured, for measuring the amount of head material ground away between a front surface of the magnetic head and the front edge of the magneto-electric converting element in order to control a two-stage grinding operation on the head.
    Type: Grant
    Filed: December 18, 1972
    Date of Patent: May 15, 1979
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroshi Muraoka, Teruo Tohma
  • Patent number: 3964103
    Abstract: A magnetic head assembly and the method of manufacture therefor comprising a generally cylindrical housing having a tapered portion at one end thereof terminating in a circular aperture having an inner diameter, a circular slider body having an outer diameter slightly less than the inner diameter, a media engaging surface and an internal surface and being disposed within the circular aperture and affixed to the housing. The body also includes a first elongated slot disposed along a first diameter and extending through the body, a second slot disposed along a second diameter normal to the first diameter and extending into the body from the internal surface, and a central aperture extending through the body at the intersection of the first and second slots. A read/write transducer has a pair of read/write pole pieces which are separated to provide a read/write gap and which extend into the first slot with the read/write gap positioned with the central aperture.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: June 15, 1976
    Assignee: Shugart Associates, Inc.
    Inventors: Herbert E. Thompson, David A. Brown