Patents by Inventor Masaaki Matsumoto

Masaaki Matsumoto 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).

  • Patent number: 7209309
    Abstract: A magnetic disk apparatus includes a rotation mechanism for driving a magnetic disk, a magnetic head slider being floated in close proximity to a surface of the magnetic disk, a recording/reproduction element for performing recording and playback of information, a drive unit for causing a distance between the record/reproduction element and the magnetic disk to change, and an arrangement to effect position determination of the magnetic head slider, wherein the apparatus has a detection unit for permitting the drive unit to gradually reduce the distance between the record/reproduction element and the magnetic disk and for detecting occurrence of contact therebetween, and a control unit for controlling the drive unit in such a way as to cause, the record/reproduction element to shift in position by a fixed amount to thereby let the distance between this element and magnetic disk increase accordingly.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: April 24, 2007
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Masayuki Kurita, Masaaki Matsumoto, Yuuichi Ootani, Yoshihiko Miyake, Shinsuke Higuchi, Hideaki Tanaka, Junguo Xu
  • Publication number: 20070070550
    Abstract: A disk apparatus including: a head slider for being floated above a disk; a record/reproduction element provided at the head slider for recording and/or reproducing information on and/or from the disk; a displacer for shifting the record/reproduction element to approach closer to, or retreat farther away from, the disk; and a controller for controlling the displacer to shift the record/reproduction element in a direction to retreat rather from the disk, if the record/reproduction element has contacted the disk.
    Type: Application
    Filed: November 30, 2006
    Publication date: March 29, 2007
    Inventors: Masayuki Kurita, Masaaki Matsumoto, Yuuichi Ootani, Yoshihiko Miyake, Shinsuke Higuchi, Hideaki Tanaka, Junguo Xu
  • Patent number: 7164556
    Abstract: A magnetic head slider includes a magnetic head mounting surface, a slider rail surface, a step air bearing surface, and a negative pressure groove. The magnetic head mounting surface is arranged in a center area with respect to a width of the slider near an air flow-out edge on the slider and mounts a magnetic head. The slider rail surface has a first depth from the magnetic head mounting surface and its width on an air flow-in side for the magnetic head is wider that its width on an air flow-out side for the magnetic head. The step air bearing surface is formed on an air flow-in side of the slider rail surface and has a second depth from the slider rail surface. The negative-pressure groove which formed on an air flow-in side of the step air bearing surface and has a third depth from the step air bearing surface.
    Type: Grant
    Filed: August 11, 2005
    Date of Patent: January 16, 2007
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
  • Publication number: 20060177597
    Abstract: Concave grooves for forming a receiving layer for inkjet printing are provided at the inner peripheral and outer peripheral boundary portions of an application region on a disk substrate. The concave grooves are formed with a substantially V-shaped cross section, and with a depth d that is at least equal to the film thickness of the coating film within a central region between the concave grooves. A plurality of nozzles of a supply device is arrayed in a radial direction across the central region between the concave grooves, and a substantially constant quantity of coating liquid per unit of surface area is applied so as to form a coating film of a predetermined thickness. The applied coating liquid portions are flattened by a mutual leveling effect.
    Type: Application
    Filed: April 2, 2004
    Publication date: August 10, 2006
    Applicants: DAINIPPON INK AND CHEMICALS, INC., ASAHI GLASS CO., LTD.
    Inventors: Shouel Ebisawa, Masaaki Matsumoto, Norio Tsunematsu, Hiroyuki Fujii, Nobuyuki Yokota
  • Patent number: 7085103
    Abstract: A magnetic head slider, for sliding on a magnetic disk, which has 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 deeper than the front step bearing, is formed as a recess from the rail surf ace, and a side step bearing with a depth identical to that of the front step bearing is made from the rail surface. Side padB are provided which each have a width W and length L, wherein W is greater than L.
    Type: Grant
    Filed: December 14, 2004
    Date of Patent: August 1, 2006
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshinori Takeuchi, Shinsuke Higuchi, Akira Iida
  • Patent number: 7061722
    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: September 18, 2002
    Date of Patent: June 13, 2006
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Hidekazu Kohira, Hiromitsu Tokisue, Masaaki Matsumoto, Masayuki Suzuki, Yoshinori Takeuchi, Toshihiko Shimizu
  • Patent number: 7042678
    Abstract: A magnetic head slider in which a leading pad is projected in a thicknesswise direction of the slider, in comparison with a trailing pad so as to reduce vibration caused by contact between a flat medium surface of a disc and the slider carrying thereon a magnetic head, to reduce variation in flying height caused by wavy unevenness of the medium surface, and to reduce variation in atmospheric pressure around the slider, thereby it is possible to enhance the recording density and the reliability of the magnetic head slider while reducing the costs thereof. Further, a magnetic disc unit using the above-mentioned magnetic head slider.
    Type: Grant
    Filed: June 25, 2003
    Date of Patent: May 9, 2006
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Ryuji Tsuchiyama, Hiroshi Tani, Mikio Tokuyama, Hidekazu Kohira, Masayuki Kurita, Mitsuhiro Shoda, Junguo Xu, Masaaki Matsumoto
  • Patent number: 7038883
    Abstract: A magnetic head slider mounted on a magnetic disk unit for supporting a magnetic head that writes and reads information to and from a magnetic disk is constructed such that a depth ?s1 from the surfaces of leading and trailing pads, which come into contact with a medium surface when the disk is at rest, to stepped surfaces formed on the air inflow side of the leading pads, a depth ?s2 from the contact surfaces to stepped surfaces formed on the air inflow side of the trailing pad and a step depth ?s3 from the contact surfaces to the surfaces of side rails are in a relation of ?s1??s2??s3. With this arrangement, the slider can follow the waved medium surface at a low flying height with a small flying height fluctuation, thus realizing high density recording, high reliability and reduced cost of the magnetic disk unit.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: May 2, 2006
    Assignee: Hitachi Golbal Storage Technologies Japan, Ltd.
    Inventors: Ryuji Tsuchiyama, Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Junguo Xu
  • Publication number: 20060058163
    Abstract: A training apparatus comprises a body part, a handlebar assembly gripped by the user, a handle stem rotatably supporting the handlebar assembly, a saddle provided on the body part so that the user sits down thereon and pedals rotatably set on the body part so that the user takes exercise by pedaling. The handle stem includes a base part connected with the body part and a movable part arranged on a side closer to the handlebar assembly and inclinably coupled to the base part.
    Type: Application
    Filed: September 8, 2005
    Publication date: March 16, 2006
    Inventor: Masaaki Matsumoto
  • Publication number: 20060039077
    Abstract: A magnetic head slider including: a head element which records or reproduces information on a magnetic disk, a slider having said head element, and an electric conducting film in which paired first and second parts are formed to be substantially parallel, where current flows within said first and second parts are in the opposite direction as against said slider.
    Type: Application
    Filed: October 25, 2005
    Publication date: February 23, 2006
    Inventors: Junguo Xu, Ryuji Tsuchiyama, Mikio Tokuyama, Masaaki Matsumoto
  • Publication number: 20050270697
    Abstract: A magnetic head slider includes a magnetic head mounting surface, a slider rail surface, a step air bearing surface, and a negative pressure groove. The magnetic head mounting surface is arranged in a center area with respect to a width of the slider near an air flow-out edge on the slider and mounts a magnetic head. The slider rail surface has a first depth from the magnetic head mounting surface and its width on an air flow-in side for the magnetic head is wider that its width on an air flow-out side for the magnetic head. The step air bearing surface is formed on an air flow-in side of the slider rail surface and has a second depth from the slider rail surface. The negative-pressure groove which formed on an air flow-in side of the step air bearing surface and has a third depth from the step air bearing surface.
    Type: Application
    Filed: August 11, 2005
    Publication date: December 8, 2005
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
  • Patent number: 6963464
    Abstract: An object of the present invention is to prevent a spacing between a magnetic head and a writing medium at low temperature from increasing to cause a writing/reading error, and to prevent the magnetic head element protruded by a temperature increase from colliding with small protrusions on a magnetic disk surface, and to prevent damage on the element, and to prevent the occurrence of thermal asperity. In order to attain the object, a magnetic head slider is provided, which includes a magnetic head element supported on a rotating magnetic disk via a gap to write or read information on the magnetic disk, and a heat source for heating the magnetic head element. A magnetic disk device is further provided, which includes a magnetic head slider.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: November 8, 2005
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Junguo Xu, Ryuji Tsuchiyama, Mikio Tokuyama, Masaaki Matsumoto
  • Patent number: 6934123
    Abstract: A magnetic disk device includes a magnetic disk, and a magnetic head slider. The slider has a magnetic head, 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. The slider rail surface includes a long sideways rail surface on an air flow-in side and a lengthwise rail surface on an air flow-out side. The nearest surface of the plurality of surfaces is arranged only in a center area with respect to a width of the slider near the air flow-out edge and has a width substantially less than the width of the slider. An area of the long sideways rail surface is larger than an area of the lengthwise rail surface.
    Type: Grant
    Filed: May 24, 2004
    Date of Patent: August 23, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
  • Patent number: 6910991
    Abstract: A stationary bike can control a display content appearing on a screen in accordance with its operation. The stationary bike basically includes a body, a handlebar rotatably attached to the body and a control unit controlling the display content on the screen, and is characterized by a restoring mechanism restoring the handlebar to an initial position. The restoring mechanism is configured with a coil spring wound around an outer circumference of a shaft, a hook securing one end of the coil spring to the shaft, and a hook securing the other end of the coil spring to a tubular member. The hooks are respectively engaged with a bolt secured to the shaft and with a bolt secured to the tubular member.
    Type: Grant
    Filed: October 7, 2003
    Date of Patent: June 28, 2005
    Assignee: Cateye Co., Ltd.
    Inventor: Masaaki Matsumoto
  • Publication number: 20050099729
    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 ?s of said front step bearing is R/?s ?5.
    Type: Application
    Filed: December 14, 2004
    Publication date: May 12, 2005
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshinori Takeuchi, Shinsuke Higuchi, Akira Iida
  • Publication number: 20050064994
    Abstract: A stationary bike can control a display content appearing on a screen in accordance with its operation. The stationary bike basically includes a body, a handlebar rotatably attached to the body and a control unit controlling the display content on the screen, and is characterized by a restoring mechanism restoring the handlebar to an initial position. The restoring mechanism is configured with a coil spring wound around an outer circumference of a shaft, a hook securing one end of the coil spring to the shaft, and a hook securing the other end of the coil spring to a tubular member. The hooks are respectively engaged with a bolt secured to the shaft and with a bolt secured to the tubular member.
    Type: Application
    Filed: October 7, 2003
    Publication date: March 24, 2005
    Inventor: Masaaki Matsumoto
  • Publication number: 20050013057
    Abstract: A magnetic disk apparatus includes a rotation mechanism for driving a magnetic disk, a magnetic head slider being floated in close proximity to a surface of the magnetic disk, a recording/reproduction element for performing recording and playback of information, a drive unit for causing a distance between the record/reproduction element and the magnetic disk to change, and means for performing position determination of the magnetic head slider, wherein the apparatus has a detection unit for permitting the drive unit to gradually reduce the distance between the record/reproduction element and the magnetic disk and for detecting occurrence of contact therebetween, and a control unit for controlling the drive unit in such a way as to cause, the record/reproduction element to shift in position by a fixed amount to thereby let the distance between this element and magnetic disk increase accordingly.
    Type: Application
    Filed: August 18, 2004
    Publication date: January 20, 2005
    Inventors: Masayuki Kurita, Masaaki Matsumoto, Yuuichi Ootani, Yoshihiko Miyake, Shinsuke Higuchi, Hideaki Tanaka, Junguo Xu
  • Patent number: 6842309
    Abstract: A magnetic head slider, for sliding on a magnetic disk, which comprises 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 with a depth identical to that of the front step bearing is made from the rail surface, wherein the ratio of depth R of the recess and depth ?s of the front step bearing is R/?s?5.
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: January 11, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshihori Takeuohi, Shinsuke Higuchi, Akira Iida
  • Publication number: 20040212930
    Abstract: A magnetic disk device includes a magnetic disk, and a magnetic head slider. The slider has a magnetic head, 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. The slider rail surface includes a long sideways rail surface on an air flow-in side and a lengthwise rail surface on an air flow-out side. The nearest surface of the plurality of surfaces is arranged only in a center area with respect to a width of the slider near the air flow-out edge and has a width substantially less than the width of the slider. An area of the long sideways rail surface is larger than an area of the lengthwise rail surface.
    Type: Application
    Filed: May 24, 2004
    Publication date: October 28, 2004
    Inventors: Hidekazu Kohira, Masaaki Matsumoto, Hideaki Tanaka, Teruyoshi Higashiya, Kiyoshi Hashimoto, Akira Matsuda, Takanori Yamazaki
  • Patent number: 6798605
    Abstract: A magnetic disk apparatus includes a rotation mechanism for driving a magnetic disk, a magnetic head slider being floated in close proximity to a surface of the magnetic disk, a recording/reproduction element for performing recording and playback of information, a drive unit for causing a distance between the record/reproduction element and the magnetic disk to change, and means for performing position determination of the magnetic head slider, wherein the apparatus has a detection unit for permitting the drive unit to gradually reduce the distance between the record/reproduction element and the magnetic disk and for detecting occurrence of contact therebetween, and a control unit for controlling the drive unit in such a way as to cause, the record/reproduction element to shift in position by a fixed amount to thereby let the distance between this element and magnetic disk increase accordingly.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: September 28, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Masayuki Kurita, Masaaki Matsumoto, Yuuichi Ootani, Yoshihiko Miyake, Shinsuke Higuchi, Hideaki Tanaka, Junguo Xu