Patents by Inventor Yoshinari Yokoo

Yoshinari Yokoo 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).

  • Manufacturing method of bearing, bearing unit, rotary apparatus, and manufacturing method of sliding member
    Patent number: 8186061
    Abstract: A manufacturing method of a bearing according to the present invention includes a bearing forming member preparing step S10 for preparing a bearing forming member W made of AlSi alloy containing 5 weight % to 40 weight % of Si, a pressure sizing step S20 which decreases a maximum crest height Rp of a bearing surface 132 by performing pressure sizing of the bearing surface 132 of the bearing forming member W, and an aluminum oxide film forming step S30 for forming an aluminum oxide film 36 on the bearing surface 132 of the bearing forming member W by anodizing the bearing surface 132 of the bearing forming member W in this order. According to the manufacturing method of a bearing of the present invention, it is possible to manufacture a bearing which can maintain the bearing performance over a long period.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: May 29, 2012
    Assignee: Gast Japan Co., Ltd.
    Inventor: Yoshinari Yokoo
  • Manufacturing method of bearing, bearing unit, rotary apparatus, and manufacturing method of sliding member
    Publication number: 20110123141
    Abstract: A manufacturing method of a bearing according to the present invention includes a bearing forming member preparing step S10 for preparing a bearing forming member W made of AlSi alloy containing 5 weight% to 40 weight % of Si, a pressure sizing step S20 which decreases a maximum crest height Rp of a bearing surface 132 by performing pressure sizing of the bearing surface 132 of the bearing forming member W, and an aluminum oxide film forming step S30 for forming an aluminum oxide film 36 on the bearing surface 132 of the bearing forming member W by anodizing the bearing surface 132 of the bearing forming member W in this order. According to the manufacturing method of a bearing of the present invention, it is possible to manufacture a bearing which can maintain the bearing performance over a long period.
    Type: Application
    Filed: November 5, 2007
    Publication date: May 26, 2011
    Applicant: GAST JAPAN CO., LTD
    Inventor: Yoshinari Yokoo
  • Dynamic pressure bearing device, spindle motor, disk drive device, and method of manufacturing dynamic pressure bearing device
    Patent number: 7134791
    Abstract: A dynamic pressure bearing device and a spindle motor used for a magnetic disk drive device capable of increasing an impact resistance, reducing A-PRO (oscillating motion of shaft), reducing a variation in rigidity of bearings against a variation in temperature, suppressing a current loss, and reducing a size and a thickness.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: November 14, 2006
    Inventor: Yoshinari Yokoo
  • Dynamic pressure bearing device, spindle motor, disk drive device, and method of manufacturing dynamic pressure bearing device
    Publication number: 20050249440
    Abstract: A dynamic pressure bearing device and a spindle motor used for a magnetic disk drive device capable of increasing an impact resistance, reducing A-PRO (oscillating motion of shaft), reducing a variation in rigidity of bearings against a variation in temperature, suppressing a current loss, and reducing a size and a thickness.
    Type: Application
    Filed: July 18, 2003
    Publication date: November 10, 2005
    Inventor: Yoshinari Yokoo