Patents by Inventor Taizou Ikegawa

Taizou Ikegawa 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).

  • Hydrodynamic bearing device
    Patent number: 6877902
    Abstract: A hydrodynamic bearing device in which an incline between the center line of a shaft and the center line of a sleeve can be eliminated, rotational precision improved, and NRRO reduced, characterized in that different bearing lengths (L1 and L2) are selected for radial bearing portions and that at least any one parameter selected from among groove depths of pressure generating grooves, groove angles formed between the grooves and the radial direction of an shaft, and groove width ratios [a/(a+b)] of groove width (a) in relation to the sum (a+b) of the groove width (a) and ridge width (b) is caused to vary among the plurality of radial bearing portions.
    Type: Grant
    Filed: May 23, 2002
    Date of Patent: April 12, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Taizou Ikegawa
  • Dynamic pressure fluid bearing device
    Publication number: 20030174917
    Abstract: A hydrodynamic bearing device in which an incline between the center line of a shaft and the center line of a sleeve can be eliminated, rotational precision improved, and NRRO reduced, characterized in that different bearing lengths (L1 and L2) are selected for radial bearing portions and that at least any one parameter selected from among groove depths of pressure generating grooves, groove angles formed between the grooves and the radial direction of an shaft, and groove width ratios [a/(a+b)] of groove width (a) in relation to the sum (a+b) of the groove width (a) and ridge width (b) is caused to vary among the plurality of radial bearing portions.
    Type: Application
    Filed: January 28, 2003
    Publication date: September 18, 2003
    Inventor: Taizou Ikegawa