Patents by Inventor Junko Satake

Junko Satake 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).

  • Spindle motor with seal structure
    Patent number: 5821646
    Abstract: A spindle motor comprises a stationary shaft, a rotor hub rotatably mounted by ball bearings to the stationary shaft, and annular sealing members disposed between the outer surface of the stationary shaft and the inner side of the rotor hub axially outwardly of the ball bearings. The sealing member is directly fitted onto the outer race of the corresponding ball bearing. The outer race of each ball bearing is high precision finished so that the sealing member is definitely coaxial with the stationary shaft regardless of the finishing accuracy on the inner side of the rotor hub. Accordingly, the radial distance between the inner side of the sealing member and the outer surface of the stationary shaft can be minimized with high precision offering an excellent labyrinth effect.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: October 13, 1998
    Assignee: Nidec Corporation
    Inventors: Masanobu Chuta, Hiroshi Matsumoto, Junko Satake, Hiromi Iida, Koji Tomita
  • Spindle motor with seal structure
    Patent number: 5596235
    Abstract: A spindle motor comprises a stationary shaft, a rotor hub rotatably mounted by ball bearings to the stationary shaft, and annular sealing members disposed between the outer surface of the stationary shaft and the inner side of the rotor hub axially outwardly of the ball bearings. The sealing member is directly fitted onto the outer race of the corresponding ball bearing. The outer race of each ball bearing is high precision finished so that the sealing member is definitely coaxial with the stationary shaft regardless of the finishing accuracy on the inner side of the rotor hub. Accordingly, the radial distance between the inner side of the sealing member and the outer surface of the stationary shaft can be minimized with high precision offering an excellent labyrinth effect.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: January 21, 1997
    Assignee: Nidec Corporation
    Inventors: Asao Yazaki, Masanobu Chuta, Hiroshi Matsumoto, Junko Satake, Hiromi Iida, Koji Tomita