Patents by Inventor MuiChong Chai

MuiChong Chai 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).

  • Low friction load/unload lift tab
    Publication number: 20080151434
    Abstract: A transducing system includes a support assembly for supporting a transducer and a lift tab extending from the support assembly. The lift tab has a surface configured to lift the support assembly carrying the transducer up a load/unload ramp. The surface of the lift tab has a radius of curvature of less than 0.013 inches.
    Type: Application
    Filed: December 22, 2006
    Publication date: June 26, 2008
    Applicant: Seagate Technology LLC
    Inventors: Marsha A. Huha, Muichong Chai
  • Load/unload ramp
    Publication number: 20070091507
    Abstract: A disc drive utilizes ramp load unload technology. A ramp component of the disc drive includes a recess that reduces the contact surface area of the ramp component that supports an actuator assembly to unload a slider of the disc drive. The actuator assembly may include a lift tab that interacts with the ramp component to hold the slider off a media disc when the slider is unloaded.
    Type: Application
    Filed: October 26, 2005
    Publication date: April 26, 2007
    Applicant: Seagate Technology LLC
    Inventors: Pow-Hing Yong, CheeFong Oh, Samual Gan, LiHong Zhang, MuiChong Chai
  • Method and apparatus for measuring the back EMF of a disc drive VCM
    Patent number: 6937427
    Abstract: An apparatus and method of measuring a back electromotive force (BEMF) voltage of a disc drive voice coil motor (VCM) is provided in which a temperature of the VCM is obtained. The BEMF voltage of the VCM is computed as a function of the temperature of the VCM.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: August 30, 2005
    Assignee: Seagate Technology LLC
    Inventors: LeeLing Tan, Xiong Liu, ChoonKit Lim, MuiChong Chai
  • Method and apparatus for measuring the back EMF of a disc drive VCM
    Publication number: 20040257695
    Abstract: An apparatus and method of measuring a back electromotive force (BEMF) voltage of a disc drive voice coil motor (VCM) is provided in which a temperature of the VCM is obtained. The BEMF voltage of the VCM is computed as a function of the temperature of the VCM.
    Type: Application
    Filed: June 19, 2003
    Publication date: December 23, 2004
    Inventors: LeeLing Tan, Xiong Liu, ChoonKit Lim, MuiChong Chai
  • Method and apparatus for predicting a head crash in a disc drive
    Patent number: 6822821
    Abstract: A head crash in a hard disc drive is predicted by periodically measuring a head-disc contact energy level on an actuator arm supporting the head and identifying a predetermined change in the energy level between at least two energy level measurements. The head-disc contact energy level is measured by a positioning microactuator on the actuator arm, and comparing that energy level to a threshold established during an earlier or selected contact start-stop cycle. A circuit is coupled to the microactuator and is periodically operable to identify a magnitude of contact energy. An indicator is coupled to the circuit and responsive to the representations to indicate presence of symptoms of an impending crash.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: November 23, 2004
    Assignee: Seagate Technology LLC
    Inventors: Samuel SweeChuan Gan, MuiChong Chai, Terang KongBeng Thia, Djohni Chandra, Sanh Tran
  • Method and apparatus for predicting a head crash in a disc drive
    Publication number: 20020097516
    Abstract: A head crash in a hard disc drive is predicted by periodically measuring a head-disc contact energy level on an actuator arm supporting the head and identifying a predetermined change in the energy level between at least two energy level measurements. The head-disc contact energy level is measured by a positioning microactuator on the actuator arm, and comparing that energy level to a threshold established during an earlier or selected contact start-stop cycle. A circuit is coupled to the microactuator and is periodically operable to identify a magnitude of contact energy. An indicator is coupled to the circuit and responsive to the representations to indicate presence of symptoms of an impending crash.
    Type: Application
    Filed: September 20, 2001
    Publication date: July 25, 2002
    Inventors: Samuel SweeChuan Gan, MuiChong Chai, Terang KongBeng Thia, Djohni Chandra, Sanh Tran