Patents by Inventor Ryoji Yamaguchi

Ryoji Yamaguchi 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: 4827468
    Abstract: An information memory medium adapted for processing information with a drive mechanism including a turntable which has a support surface and a magnetic attraction member. The information memory medium includes a disk-shaped body, and an attractable member and a label disposed on the body. The label represents a manufacturer, recording sides, and type of the disk, etc., and is located on a portion of the body other than the surface where the attractable member is disposed and other than where the support surface comes in contact with the body.
    Type: Grant
    Filed: June 18, 1987
    Date of Patent: May 2, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuharu Odawara, Ryoji Yamaguchi, Nobuo Inage
  • Patent number: 4538081
    Abstract: In an electric motor unit, a spindle is rotatably supported by bearing sections of a dynamic-pressure type, and is floated along its axis by a magnetic thrust bearing. At the bearing sections, air current layers are formed in the gaps between journals of the spindle and bearings by elongated parallel grooves formed along the axis, and the spindle is supported by pressure distributed over the air current layers. In the thrust bearing, rotor magnets fixed to the spindle are attracted to stator magnets fixed to the housing and surrounding the rotor magnets. The spindle is floated along the axis by the attraction between the magnets.
    Type: Grant
    Filed: February 7, 1983
    Date of Patent: August 27, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Masashi Kamiya, Mitsuo Sumiya, Ryoji Yamaguchi
  • Patent number: 4489410
    Abstract: An apparatus for installing a disk having a through hole formed in the center thereof, which comprises a rotatable shaft, a disk support which is fixed to the rotatable shaft and has a supporting surface for supporting the one side of the disk, and a disk holder which is detachably fitted to the rotatable shaft and presses the disk on its other side toward the supporting surface, thereby to cause the disk to be fixed between the disk holder and the disk support. The disk holder includes a holder body which is provided to be fitted onto the rotatable shaft and movable along the rotatable shaft, a pressure assembly which is disposed on the holder body to exert the disk on its other side an elastic pressure against the supporting surface, and a slip preventive mechanism for preventing the holder body from the rotatable shaft by engaging the holder body with the rotatable shaft through the fitting of the holder body onto the rotatable shaft.
    Type: Grant
    Filed: April 30, 1982
    Date of Patent: December 18, 1984
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Ryoji Yamaguchi, Yoshiaki Tago
  • Patent number: 4488645
    Abstract: The invention provides a case for housing information memory media therein, having a base sheet which is integrally constituted by a first case section, a second case section and a third case section through a first connecting portion and a second connecting portion. The first and second connecting portions which are included in the third case section can be folded. When the base sheet is folded so that the first and second case sections oppose each other, a space is formed to contain the main formation memory medium therein. A flexible polyvinyl chloride sheet which forms a pocket is adhered on the first case section 14. The flexible polyvinyl chloride sheet is located on a surface of the base sheet which opposes a surface at which the space is formed to house the main information memory medium therein. A hole is formed near an opening of the pocket to extend through the flexible polyvinyl chloride sheet.
    Type: Grant
    Filed: January 18, 1983
    Date of Patent: December 18, 1984
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Ryoji Yamaguchi
  • Patent number: 4443043
    Abstract: In a motor unit, a motor shaft is supported by a pair of journal bearings of a herringbone dynamic pressure type. A polygonal mirror is fixed to one end of the motor shaft, and a magnetic thrust bearing is arranged at the other end so that the motor shaft is suspended thereby. The magnetic thrust bearing is formed of ring-shaped first and second permanent magnets. The first permanent magnets are coaxially fixed to the motor shaft and each have one pole on their outer surfaces. The second permanent magnets are fixed to a motor housing, and have their inner surfaces opposed to the outer surfaces of the first permanent magnets. The inner surface of each second permanent magnet has a pole different from that of its corresponding first permanent magnet. The first and second permanent magnets attract one another so that the motor shaft is suspended by attraction.
    Type: Grant
    Filed: August 26, 1982
    Date of Patent: April 17, 1984
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Ryoji Yamaguchi
  • Patent number: 4421385
    Abstract: A rotatable mirror having a body with a regular polygon cross section, the faces of the polygon being mirror facets for scanning a laser beam, in combination with a container for storing the mirror. The container cooperates with elements of the mirror for preventing axial or lateral movement of the mirror in the container. Structure on the top surface of the body of the mirror both provides for handling the mirror without touching the facets and interacts with the cover of the container for securing the mirror when therein. A circular groove in the upper surface of the body of the mirror may receive a balance weight for compensating for any eccentricity between the centroid of the mirror and its axis of rotation.
    Type: Grant
    Filed: June 30, 1981
    Date of Patent: December 20, 1983
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Ryoji Yamaguchi
  • Patent number: 4327287
    Abstract: A laser scanning apparatus for scanning a stationary document, which comprises a laser beam deflecting means for deflecting a laser beam such that it scans the stationary document in a main scanning direction, a movable optical means provided between the laser beam deflecting means and stationary document and serving to deflect the laser beam such that it scans in an auxiliary scanning direction substantially at right angles to the main scanning direction, and an optical detecting means moved together with the movable optical means and receiving the scattered beam component from said document.
    Type: Grant
    Filed: February 7, 1980
    Date of Patent: April 27, 1982
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Tutomu Saito, Ryoji Yamaguchi
  • Patent number: 4165871
    Abstract: A pattern reading device comprises feed mechanism for storing a sheaf of cards carrying patterns and feeding said cards one by one, a conveying mechanism having a plurality of pinch members at regular intervals to pinch the forward edge of each fed card and convey said card to a reading section, and an optical reader provided in said reading section for reading patterns on said cards.
    Type: Grant
    Filed: May 16, 1977
    Date of Patent: August 28, 1979
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventor: Ryoji Yamaguchi
  • Patent number: D265087
    Type: Grant
    Filed: September 27, 1979
    Date of Patent: June 22, 1982
    Assignee: Iwatsu Electric Co., Ltd.
    Inventors: Ryoji Yamaguchi, Noboru Mihara
  • Patent number: D267179
    Type: Grant
    Filed: September 27, 1979
    Date of Patent: December 7, 1982
    Assignee: Iwatsu Electric Company, Limited
    Inventors: Ryoji Yamaguchi, Toshio Kurita
  • Patent number: D289165
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: April 7, 1987
    Assignee: Iwatsu Electric Co., Ltd.
    Inventors: Takashi Oshima, Ryoji Yamaguchi, Kiyoshi Hizume