Patents by Inventor Tien Q. Le

Tien Q. Le 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).

  • Patent number: 6298545
    Abstract: A system for positioning a transducing head in a disc drive device over a selected track of a rotatable disc includes an actuator arm which is rotatable about an axis, a head suspension mechanism connected to the actuator arm, and a slider carrying a transducing head and supported by the head suspension mechanism. A low resolution motor moves the actuator arm about the axis to effect coarse movement of the head between tracks of the disc. A piezoelectric element is embedded in the actuator arm to distort the arm to effect fine positioning of the head. Control circuitry distributes electrical signals to the low resolution motor and the piezoelectric element to selectively control movement thereof. The piezoelectric element is embedded in the actuator arm by removing a predetermined amount of material from the actuator arm and bonding the piezoelectric element in the resulting space in the actuator arm.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: October 9, 2001
    Assignee: Seagate Technology LLC
    Inventors: Khosrow Mohajerani, Joseph M. Sampietro, Anoush M. Fard, Jeffrey G. Barina, Muhammad A. Hawwa, LeRoy A. Volz, Tien Q. Le, Daniel R. Vigil
  • Publication number: 20010012172
    Abstract: A dual-stage disc drive actuation system for positioning a transducing head over a selected track of a rotatable disc having a plurality of concentric tracks includes a low resolution actuator and a high resolution microactuator. An input circuit provides a signal corresponding to the selected track. The actuator and microactuator are then operated to position the head over the selected track. The dual-stage actuation system positions the head over the selected track without significant off-track error within about 0.5 milliseconds for a track density of at least about 12,000 tracks-per-inch.
    Type: Application
    Filed: March 3, 1998
    Publication date: August 9, 2001
    Inventors: MUHAMMAD A. HAWWA, JOSEPH M. SAMPIETRO, TIEN Q. LE, LEROY A. VOLZ, DANIEL R. VIGIL
  • Patent number: 6052251
    Abstract: A system for positioning a transducing head in a disc drive device over a selected track of a rotatable disc includes an actuator arm which is rotatable about an axis, a head suspension mechanism connected to the actuator arm, and a slider carrying a transducing head and supported by the head suspension mechanism. A low resolution motor moves the actuator arm about the axis to effect coarse movement of the head between tracks of the disc. A piezoelectric element is embedded in the actuator arm to distort the arm to effect fine positioning of the head. Control circuitry distributes electrical signals to the low resolution motor and the piezoelectric element to selectively control movement thereof. The piezoelectric element is embedded in the actuator arm by removing a predetermined amount of material from the actuator arm and bonding the piezoelectric element in the resulting space it the actuator arm.
    Type: Grant
    Filed: May 12, 1997
    Date of Patent: April 18, 2000
    Assignee: Seagate Technology, Inc.
    Inventors: Khosrow Mohajerani, Joseph M. Sampietro, Anoush M. Fard, Jeffrey G. Barina, Muhammad A. Hawwa, LeRoy A. Volz, Tien Q. Le, Daniel R. Vigil
  • Patent number: 5369345
    Abstract: Methods and apparatus for controlling a plant are described. The control methods are adaptive and compensate for changes in plant component characteristics and plant environment, and are applicable to systems having a bias force. The methods are described in relation to a sampled-data control system for a computer disc drive servo actuator apparatus but the control methods are independent of plant type. Methods for extending a linear measurement range of a position sensor, for generating a plant gain constant, for measuring plant phase, for measuring plant resonance frequencies and compensating for the effects of plant resonance, and for switching between different modes depending on characteristics of the applied control value are described. These methods may be used separately or in combination to achieve the desired control.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: November 29, 1994
    Assignee: Seagate Technology, Inc.
    Inventors: Duc T. Phan, Tien Q. Le