Patents by Inventor ChoonHoe Koh

ChoonHoe Koh 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).

  • Sensing a prior transducer position by a motion pattern
    Patent number: 7295395
    Abstract: A motion pattern of an actuator supporting a head is monitored during/after a disc spin-up. The monitor's signal is configured to generate a digital indication of where the head was just before the spin-up. The digital indication is optionally a single-bit indicator that is used directly as a decision of whether to continue a start-up operation.
    Type: Grant
    Filed: March 12, 2004
    Date of Patent: November 13, 2007
    Assignee: Seagate Technology LLC
    Inventors: ChoonHoe Koh, HengChang Guo, WaiKhay Chan, JiaHong Shu, KianKeong Ooi, KianSoon Yeo, BengWee Quak, YuNang Zai, Kong Yaw Lucas Lee
  • Sensing a prior head position by a motion pattern
    Publication number: 20050201000
    Abstract: A motion pattern of an actuator supporting a head is monitored during/after a disc spin-up. The monitor's signal is configured to generate a digital indication of where the head was just before the spin-up. The digital indication is optionally a single-bit indicator that is used directly as a decision of whether to continue a start-up operation.
    Type: Application
    Filed: March 12, 2004
    Publication date: September 15, 2005
    Inventors: ChoonHoe Koh, HengChang Guo, WaiKhay Chan, JiaHong Shu, KianKeong Ooi, KianSoon Yeo, BengWee Quak, YuNang Zai, Kong Lee
  • Control object positioning using jerk, current and time optimized control profiles
    Patent number: 6873490
    Abstract: Method and apparatus for moving a control object, such as a data transducing head in a data storage device, from an initial position to a destination position. A base generation term describes a normalized trajectory (acceleration, velocity, displacement) of the control object away from the initial position and toward the destination position. A control profile is determined in relation to the base generation term as well as in relation to an acceleration distance and an acceleration time, respectively characterized as a displacement distance and an elapsed time during which the control object is accelerated. The control object is then moved in relation to the control profile. The base generation term is preferably stored in a table which is accessed and scaled in relation to the displacement distance (seek length) for the control object.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: March 29, 2005
    Assignee: Seagate Technology LLC
    Inventors: HengChang Guo, ChoonHoe Koh
  • Control object positioning using jerk, current and time optimized control profiles
    Publication number: 20040070863
    Abstract: Method and apparatus for moving a control object, such as a data transducing head in a data storage device, from an initial position to a destination position. A base generation term describes a normalized trajectory (acceleration, velocity, displacement) of the control object away from the initial position and toward the destination position. A control profile is determined in relation to the base generation term as well as in relation to an acceleration distance and an acceleration time, respectively characterized as a displacement distance and an elapsed time during which the control object is accelerated. The control object is then moved in relation to the control profile. The base generation term is preferably stored in a table which is accessed and scaled in relation to the displacement distance (seek length) for the control object.
    Type: Application
    Filed: June 19, 2003
    Publication date: April 15, 2004
    Inventors: HengChang Guo, ChoonHoe Koh