Patents by Inventor Fumiyasu Higuchi

Fumiyasu Higuchi 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).

  • Fluid dynamic pressure bearing device, spindle motor provided with fluid dynamic pressure bearing device, and recording disk drive device
    Patent number: 7576947
    Abstract: A fluid dynamic pressure bearing device includes a first capillary seal (50) formed between an outer circumferential surface of a bearing member 20 and an internal circumferential surface of a seal member (30). A second capillary seal portion (60) is formed between an outer circumferential surface of a shaft member (10) and a protrusion hole (31) of the seal member (30). A ventilation hole (32a) is formed in a substantially intermediate portion of a side wall of the seal member. A lubricant holding gap (73) is formed between an inner surface of a top wall (31) of the seal member (30) and the upper end surface of the bearing member (20). Leakage of lubricant (80) is suppressed by action of the capillary seal portions (50, 60), and the liquid surface is positioned in the first capillary seal portion (50) above the ventilation hole (32a), whereby extra lubricant (80) is filled in the first capillary seal portion (50) and the lubricant holding gap (73).
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: August 18, 2009
    Assignee: Minebea Co., Ltd.
    Inventors: Fumiyasu Higuchi, Naoyuki Kondo, Toshimitsu Horiuchi
  • Fluid Dynamic Pressure Bearing Device, Spindle Motor Provided with Fluid Dynamic Pressure Bearing Device, and Recording Disk Drive Device
    Publication number: 20080130168
    Abstract: A fluid dynamic pressure bearing device includes a first capillary seal (50) formed between an outer circumferential surface of a bearing member 20 and an internal circumferential surface of a seal member (30). A second capillary seal portion (60) is formed between an outer circumferential surface of a shaft member (10) and a protrusion hole (31) of the seal member (30). A ventilation hole (32a) is formed in a substantially intermediate portion of a side wall of the seal member. A lubricant holding gap (73) is formed between an inner surface of a top wall (31) of the seal member (30) and the upper end surface of the bearing member (20). Leakage of lubricant (80) is suppressed by action of the capillary seal portions (50, 60), and the liquid surface is positioned in the first capillary seal portion (50) above the ventilation hole (32a), whereby extra lubricant (80) is filled in the first capillary seal portion (50) and the lubricant holding gap (73).
    Type: Application
    Filed: November 30, 2005
    Publication date: June 5, 2008
    Applicant: Minebea Co., Ltd.
    Inventors: Fumiyasu Higuchi, Naoyuki Kondo, Toshimitsu Horiuchi