Patents by Inventor Hiroshi Sugahara

Hiroshi Sugahara 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: 5603814
    Abstract: A method of making a magneto-optical disk. A first AlGeN dielectric film is formed by reactive sputtering on a substrate. Two targets, one of aluminum and one of germanium, are used in the sputtering in a mixed atmosphere having at least nitrogen gas. Alternatively, a single target using an aluminum germanium alloy can be used. A magnetic film is formed on top of this dielectric film. A second dielectric film is then formed on top of the magnetic film. An adhesive film is formed on top of the second dielectric film and a second substrate adhered thereto.
    Type: Grant
    Filed: November 9, 1993
    Date of Patent: February 18, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuhiko Tsutsumi, Motohisa Taguchi, Hiroshi Sugahara
  • Patent number: 5450260
    Abstract: A disk drive with a turntable for supporting a flexible magnetic disk thereon has a spindle extending centrally through the turntable for engaging a first opening formed centrally in a sheet metal hub of the disk, and a drive pin arranged eccentrically of the turntable for driving the disk by engaging a second opening formed eccentrically in the disk hub. The drive pin support is made of a sheet metal support of resilient material and has an arcuate shape which is mounted flat to an underside of the turntable for deflection in a plan normal to that of the turntable. In view of the reduction of the space required for the deflection of the drive pin support and the total thickness or height of the disk drive, the drive pin is erected on an offset head portion of the support.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: September 12, 1995
    Assignee: Teac Corporation
    Inventors: Takahiro Sakaguchi, Hiroshi Sugahara
  • Patent number: 5283133
    Abstract: A magneto-optical disk comprising a substrate, a dielectric film made of aluminum germanium nitride disposed on the substrate and a magnetic film disposed on the dielectric film. The magnetic-optical disk has increased Kerr rotational angle, while having excellent corrosion resistivity and high performance with respect to the CNR ratio.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: February 1, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuhiko Tsutsumi, Motohisa Taguchi, Hiroshi Sugahara
  • Patent number: 5270290
    Abstract: The present invention pertains to an information recording medium for recording audio information, visual information, data information and so on and also to information recording and reproducing methods for recording and reproducing information on and from the information recording medium for the purpose of improving the recording density. In the present invention, information can be recorded in high density by recording, on the information recording medium comprising a base (1) and an information recording layer (10) formed on the base (1) and made of high temperature superconductive material, information in the form of a fine pattern of high temperature superconductive regions (12) and normal electroconductive regions (11). The recording of the information is carried out by radiating an oxygen ion beam to the information recording layer and controlling the amount of oxygen, contained in the high temperature superconductive material, to a predetermined value.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: December 14, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hideto Yoshimura, Hiroshi Sugahara
  • Patent number: 5263779
    Abstract: A thrust ball-bearing in which a good lubrication is maintained for a long period of time and having a long service life. The bearing comprises a plurality of balls having a uniform diameter, a retainer which retains the balls, and two plates situated at either side of the retainer and rotatable relative to each other via the balls. The retainer has a thickness less than the diameter of the ball. A plurality of holes that retain each ball is provided on the retainer and a groove having a rectangular cross section is formed in a portion between two adjacent holes. An amount of grease applied to the ball is collected inside the groove and provided to the ball located on the downstream side of flowing grease without moving outwardly of the groove even if a centrifugal force generated by a rotation of the bearing is exerted.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: November 23, 1993
    Assignee: Teac Corporation
    Inventors: Takahiro Sakaguchi, Yohji Abe, Daihachiro Takasu, Hiroshi Sugahara
  • Patent number: 5197181
    Abstract: A motor positioning method includes steps of: providing a frame of a disk drive apparatus having locating holes spaced apart from each other, the locating holes being located in accordance with a predetermined positional relationship between the locating holes and a target position; placing a positioning jig on a base surface, the positioning jig having a first connecting portion with a diameter corresponding to a reference opening at the target position and second connecting portions with diameters corresponding to respective ones of the locating holes, the second connecting portions and the first connecting portion being located in accordance with the positional relationship; placing the frame onto the positioning jig so that the second connecting portions are fitted into the locating holes; and placing a board having a drive motor, a shaft and the reference opening at the target position, onto the frame attached to the jig so that the first connecting portion is fitted into the reference opening, thus posi
    Type: Grant
    Filed: May 6, 1992
    Date of Patent: March 30, 1993
    Assignee: TEAC Corporation
    Inventors: Yohji Abe, Takahiro Sakaguchi, Daihachiro Takasu, Hiroshi Sugahara
  • Patent number: 5143797
    Abstract: A magneto-optical recording medium comprises a dielectric film disposed on a substrate and formed, for example, of silicon nitride, of for example, 65 nm thickness, a magnetic film disposed on the dielectric film, and formed, for example, of, rare earth-transistion metal alloy thin film, of, for example, 35 thickness, and a reflective film disposed on the magnetic film, and formed of titanium nitride, by, for example, sputtering.
    Type: Grant
    Filed: August 15, 1989
    Date of Patent: September 1, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuo Hashima, Kazuhiko Tsutsumi, Hiroshi Sugahara
  • Patent number: 4295110
    Abstract: A barium ferrite layer is disposed around an external surface of neck portion of a color cathode ray tube to have a magnetic easy axis radially of the longitudinal axis of the neck portion. An electromagnet is revolved around the layer to magnetically charge it so as to correct static convergence and color purity of three electron beams generated in the color cathode ray tube.
    Type: Grant
    Filed: June 13, 1979
    Date of Patent: October 13, 1981
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tatsuo Uesaka, Hiroshi Sugahara, Takeo Fujimura