Patents by Inventor Hidekazu Kohira

Hidekazu Kohira has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20030193750
    Abstract: A magnetic head slider having a plurality of surfaces which are formed sequentially from an adjacent side to a magnetic disk, and a slider rail surface, which is arranged near an air flow-out edge on a nearest surface of the plurality of surfaces including a long sideways rail surface on an air flow-in side and a lengthwise rail surface on an air flow-out side, has a magnetic head. An area of the long sideways rail surface is larger than an area of the lengthwise rail surface.
    Type: Application
    Filed: April 23, 2003
    Publication date: October 16, 2003
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
  • Patent number: 6628480
    Abstract: A magnetic head slider for sliding on a magnetic disk includes a leading edge, a trailing edge, an air bearing surface having a front step bearing of submicron depth made from the leading edge, and a rail surface made from the front step bearing. A negative pressure recess which is more profound than the front step bearing is made from the rail surface, and a side step bearing having a depth identical with the front step bearing is made from the rail surface. The ratio of the depth R of the recess to the depth &dgr;S of the front step bearing is R/&dgr;s>5.
    Type: Grant
    Filed: August 3, 1999
    Date of Patent: September 30, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshinori Takeuchi, Shinsuke Higuchi, Akira Iida
  • Publication number: 20030133227
    Abstract: A magnetic disk device, which is provided with a magnetic head slider mounted with a magnetic head and a magnetic disk, and of which the magnetic head slider has the possibility of contacting the magnetic disk at the vicinity of the magnetic head,
    Type: Application
    Filed: December 30, 2002
    Publication date: July 17, 2003
    Inventors: Hidetoshi Anan, Tetsuya Matsusaki, Hidekazu Kohira, Yoshihiro Shiroishi, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
  • Patent number: 6556381
    Abstract: A magnetic disk device is provided with a magnetic head slider mounted with a magnetic head and a magnetic disk, and the magnetic head slider has the possibility of contacting the magnetic disk at the vicinity of the magnetic head during operation of the magnetic disk device. The magnetic head slider is 1.25 mm or less in length, 1 mm or less in width and 0.3 mm or less in thickness, and the friction force exerted between the magnetic head slider and the magnetic disk is 10 mN or less. The magnetic head comprises four substantially parallel surfaces, and the depth from a first surface, which is the most adjacent surface to the magnetic disk, to a second surface is 10 nm to 50 nm, the depth from the second surface to a third surface is 50 nm to 200 nm, and the depth from the third surface to a fourth surface is 400 nm to 1 &mgr;m.
    Type: Grant
    Filed: January 18, 2001
    Date of Patent: April 29, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
  • Publication number: 20030021059
    Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of.the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.
    Type: Application
    Filed: September 18, 2002
    Publication date: January 30, 2003
    Applicant: HITACHI, LTD.
    Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
  • Publication number: 20020191341
    Abstract: A magnetic head slider has a magnetic head mounting surface holding a magnetic head, to be kept closest to a magnetic disk when the magnetic head slider is in operation, a slider rail surface contiguous with a surface, on the side of an air inlet end, and opposite sides of a portion, near an air outlet end, of the magnetic head and extending near to the air outlet end, a step bearing surface formed at least on the side of the air inlet end of the slider rail surface, and a negative-pressure groove formed so as to surround the step bearing surface. The magnetic head mounting surface is typically formed on an alumina protective film protecting the magnetic head. The variation of the flying height of the magnetic head slider with respect to a rolling direction is reduced and a proximity ability to approach the magnetic disk is improved.
    Type: Application
    Filed: July 19, 2002
    Publication date: December 19, 2002
    Applicant: HITACHI, LTD.
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Akira Matsuda, Shozo Saegusa
  • Patent number: 6493179
    Abstract: A magnetic disk unit includes a magnetic disk, a slider having a magnetic head, a suspension for providing the slider, and an actuator arm for positioning the slider on the magnetic disk a first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of the slider. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider. When the slider is seek-positioned on a certain track on the magnetic disk, a frictional force exerted between the first pad of the slider and the magnetic disk is smaller than a product of lateral stiffness of the suspension in a seeking direction and a track width.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: December 10, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
  • Publication number: 20020135941
    Abstract: A magnetic head slider for sliding on the magnetic disk, which comprises: a leading edge; a trailing edge, wherein the air bearing surface has a front step bearing with submicron depth of the air bearing surface was made from said leading edge in the continuity, a rail surface made from this front step bearing in the continuity, a negative pressure recess which is more profound than said front step bearing made in the continuity from this rail surface and a side step bearing with the depth identical with said front step bearing made in the continuity from the rail surface, whereby the ratio of depth R of said recess and depth &dgr; s of said front step bearing is R/&dgr;s>5.
    Type: Application
    Filed: August 3, 1999
    Publication date: September 26, 2002
    Inventors: HIDEKAZU KOHIRA, MASAAKI MATSUMOTO, KIYOSHI HASHIMOTO, MASAYOSHI ENDO, AKIO TAKAKURA, YOSHINORI TAKEUCHI, SHINSUKE HIGUCHI, AKIRA IIDA
  • Patent number: 6445544
    Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: September 3, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
  • Publication number: 20020057532
    Abstract: Employed is a structure for moving by a micro-actuator not a read/write element but an air-bearing surface pad. The air-bearing surface pad is arranged nearer to the leading end than the read/write element. This arrangement allows the read/write element portion to have a sufficient size, making it possible to mount the currently used read/write element and associated wiring structure. The individual adjustment of a flying height leads to the increased recording density. Moving the read/write element away from the disk during loading/unloading operations can enhance reliability.
    Type: Application
    Filed: November 14, 2001
    Publication date: May 16, 2002
    Inventors: Masayuki Kurita, Masaaki Matsumoto, Junguo Xu, Hidekazu Kohira, Yuuichi Ootani, Hideaki Tanaka, Yoshihiko Miyake, Takeshi Harada
  • Publication number: 20020024769
    Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.
    Type: Application
    Filed: September 28, 2001
    Publication date: February 28, 2002
    Applicant: HITACHI, LTD.
    Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
  • Publication number: 20010048575
    Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of. the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.
    Type: Application
    Filed: June 12, 2001
    Publication date: December 6, 2001
    Applicant: HITACHI, LTD.
    Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
  • Publication number: 20010030834
    Abstract: A magnetic disk device, which is provided with a magnetic head slider mounted with a magnetic head and a magnetic disk, and of which the magnetic head slider has the possibility of contacting the magnetic disk at the vicinity of the magnetic head,
    Type: Application
    Filed: January 18, 2001
    Publication date: October 18, 2001
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
  • Patent number: 6181524
    Abstract: A magnetic disk apparatus for recording information on and reproducing information from a magnetic disk with a magnetic head. A magnetic head supporting device includes a slider having the magnetic head mounted thereon, a flexible section supporting the slider, and a supporting section connected to the flexible section. The slider, the flexible section, and the supporting section are integrally formed from a same material. A rotary-type or linear-type positioning mechanism positions the magnetic head at a predetermined radial position of the magnetic disk.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: January 30, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Mikio Tokuyama, Kenji Mori, Hidekazu Kohira, Toshihiko Simizu, Hiromu Hirai, Takao Terayama
  • Patent number: 6157519
    Abstract: A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for reading/writing data onto/from the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. A first pad including the magnetic head and second pads including no magnetic heads are disposed on an air bearing surface of the slider. During rotation of said magnetic disk, a part of the first pad keeps in contact with the magnetic disk. A load point of the suspension with respect to the slider is positioned between a leading edge of the slider and a position located at a distance equivalent to substantially 0.42 times a whole length of the slider from the leading edge of the slider.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: December 5, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
  • Patent number: 5973880
    Abstract: A negative pressure flying head slider includes an air bearing surface of a substantially rectangular shape disposed in opposed relation to a rotating magnetic disk. One side rail of the slider is adapted to be located at an outer periphery-side of the magnetic disk when the slider is mounted on a magnetic disk device, and has an inflow-side side rail portion which is disposed at an air inflow end-side of the slider, extending generally parallel to the longitudinal direction of the slider, and an outflow-side side rail portion which is disposed at an air outflow end-side of the slider, extending in a direction of a yaw angle. The angle of the outflow-side side rail portion with respect to the inflow-side side rail portion is greater than the maximum value of an absolute value of the yaw angle. The slider further includes a recess defined by a cross rail and the side rails, and a slit formed in the cross rail to permit the recess to communicate with the air inflow end of the slider.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: October 26, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Kiyoshi Hashimoto, Masaaki Matsumoto, Hidekazu Kohira, Yasuo Kojima, Shinji Yonemura
  • Patent number: 5862017
    Abstract: In a head suspension, a gimbal spring is constituted by a flexible sheet having an electrical circuit formed on its surface, and a through hole is formed through that portion of a load beam of metal overlapping the gimbal spring. The load beam is bonded integrally to the gimbal spring to form the head suspension. There is also disclosed a rotary disk storage unit incorporating such a head suspension.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: January 19, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Mikio Tokuyama, Hiromitsu Tokisue
  • Patent number: 5519552
    Abstract: In a head suspension, a gimbal spring is constituted by a flexible sheet having an electrical circuit formed on its surface, and a through hole is formed through that portion of a metal load beam overlying the gimbal spring. The load beam is bonded integrally to the gimbal spring to form the head suspension. There is also disclosed a rotary disk storage unit incorporating such a head suspension.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: May 21, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Mikio Tokuyama, Hiromitsu Tokisue
  • Patent number: 5457545
    Abstract: An object of the present invention is to provide a facsimile apparatus having a high resolution image display unit and a hard copying unit, which is capable of preventing wasteful consumption of recording paper sheets while revealing a reduced size and excellent operation facility.
    Type: Grant
    Filed: January 5, 1993
    Date of Patent: October 10, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Shunichi Oohara, Michihiro Watanabe, Tatsuya Nagata, Kazuytaka Sato, Shogo Matsumoto
  • Patent number: 5430591
    Abstract: A flying head slider utilizing a negative pressure according to the invention has a front end, a rear end, and an air bearing surface directed to face a rotating recording medium. The air bearing surface includes a pair of side rails extending on both sides of the air bearing surface from the front end in the longitudinal direction of the slider, a center rail provided at the center of the air bearing surface in the transverse direction and extending from the front end to the rear end in the longitudinal direction of the slider, a cross rail extending in the transverse direction of the slider to connect the pair of side rails and the center rail to each other near the front end, a pair of recesses defined by the pair of side rails, the center rail and the cross rail, communicating grooves for communicating the pair of recesses with the front end, and a head mounted on a rear end surface of the center rail. The pair of side rails, the center rail and the cross rail lie substantially in the same plane.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: July 4, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Yoshinori Takeuchi, Kenji Mori, Masaaki Matsumoto, Hiroshi Agari, Jyousei Shimizu, Eisei Togawa, Yasuo Kojima, Mikio Tokuyama, Hiromitsu Tokisue, Hidekazu Kohira, Yokuo Saitoh, Haruhide Takahashi, Yoshihiro Shiorishi