Patents by Inventor Hirofumi Kajiwara

Hirofumi Kajiwara 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).

  • Method for manufacturing disk drive device
    Patent number: 8813345
    Abstract: A method for manufacturing a disk drive device includes (a) assembling a sub assembly by assembling a bearing unit and a rotating body to a fixed body in a clean room, the rotating body being supported by the bearing unit in a freely rotatable manner to the fixed body, (b) cleaning the sub assembly by spraying a mixture of a cleaning liquid and a first gas to at least either one of the fixed body and the rotating body; and (c) enclosing the sub assembly using an enclosing member.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: August 26, 2014
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Kenji Nishihara, Hirofumi Kajiwara
  • Method for manufacturing a fluid dynamic bearing, a fluid dynamic bearing, a motor, and a disk drive device
    Patent number: 8776377
    Abstract: In the method for manufacturing a fluid dynamic bearing, the fluid dynamic bearing that lubricant is not injected into is prepared in a predetermined work space. The pressure in the work space is reduced. A delivery nozzle that delivers the lubricant is inserted into the storage region. The lubricant is delivered in the storage region so that the lubricant does not spill over from the storage region. The pressure in the work space is restored. Another way is that a lubricant is ejected after an oil repellent region for preventing the lubricant from leaking out is covered.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: July 15, 2014
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Shoei Nakamura, Hirofumi Kajiwara
  • METHOD FOR MANUFACTURING DISK DRIVE DEVICE AND DISK DRIVE DEVICE MANUFACTURED BY SAME
    Publication number: 20120317794
    Abstract: A method for manufacturing a disk drive device includes (a) assembling a sub assembly by assembling a bearing unit and a rotating body to a fixed body in a clean room, the rotating body being supported by the bearing unit in a freely rotatable manner to the fixed body, (b) cleaning the sub assembly by spraying a mixture of a cleaning liquid and a first gas to at least either one of the fixed body and the rotating body; and (c) enclosing the sub assembly using an enclosing member.
    Type: Application
    Filed: June 11, 2012
    Publication date: December 20, 2012
    Applicant: ALPHANA TECHNOLOGY CO., LTD.
    Inventors: Kenji NISHIHARA, Hirofumi Kajiwara
  • METHOD FOR MANUFACTURING A FLUID DYNAMIC BEARING, A FLUID DYNAMIC BEARING, A MOTOR, AND A DISK DRIVE DEVICE
    Publication number: 20100192378
    Abstract: In the method for manufacturing a fluid dynamic bearing, the fluid dynamic bearing that lubricant is not injected into is prepared in a predetermined work space. The pressure in the work space is reduced. A delivery nozzle that delivers the lubricant is inserted into the storage region. The lubricant is delivered in the storage region so that the lubricant does not spill over from the storage region. The pressure in the work space is restored. Another way is that a lubricant is ejected after an oil repellent region for preventing the lubricant from leaking out is covered.
    Type: Application
    Filed: September 14, 2009
    Publication date: August 5, 2010
    Applicant: ALPHANA TECHNOLOGY CO., LTD.
    Inventors: Shoei Nakamura, Hirofumi Kajiwara