Patents by Inventor Jianbo J. He

Jianbo J. He 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).

  • Efficient feedforward compensation for repeatable runout in a disc drive
    Patent number: 6867943
    Abstract: Method and apparatus for more accurate track following. Control circuitry rotates a data storage surface containing thousands of annular tracks. A “measured” subset of the tracks is selected so as to be interspersed with an “unmeasured” subset. The calibration profile is derived based on position error signals each obtained by reading from the measured subset and not from the unmeasured subset. Data from the unmeasured subset of tracks is ignored, in generating and/or updating the profile.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: March 15, 2005
    Assignee: Seagate Technology LLC
    Inventors: Brent Jay Harmer, Jianbo J. He, Khalil B. Dizaji, Hai Thanh Ho, Reed David Hanson
  • Efficient feedforward compensation for repeatable runout in a disc drive
    Publication number: 20030112544
    Abstract: Method and apparatus for more accurate track following. Control circuitry rotates a data storage surface containing thousands of annular tracks. A “measured” subset of the tracks is selected so as to be interspersed with an “unmeasured” subset. The calibration profile is derived based on position error signals each obtained by reading from the measured subset and not from the unmeasured subset. Data from the unmeasured subset of tracks is ignored, in generating and/or updating the profile.
    Type: Application
    Filed: June 26, 2002
    Publication date: June 19, 2003
    Inventors: Brent Jay Harmer, Jianbo J. He, Khalil B. Dizaji, Hai Thanh Ho, Reed David Hanson