Patents by Inventor YuNang Zai

YuNang Zai 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
  • Disc drive actuator parking detector
    Patent number: 6958880
    Abstract: A device for detecting an actuator assembly parking error when a disc drive is powered on includes a magnetic latch attached to the actuator assembly and a latch pin assembly electrically connected to a base plate in the disc drive, where the latch pin assembly is positioned to contact the magnetic latch only when the actuator's read/write head is positioned over a parking zone on the disc. A detection module is electrically connected to the magnetic latch and thus is able to detect whether or not the magnetic latch is contacting the latch pin assembly when the disc drive is powered on. A method for detecting an actuator assembly parking error includes powering on the disc drive, determining whether the magnetic latch has electrical contact with the latch pin assembly, and reporting a parking error if the magnetic latch does not have electrical contact with the latch pin assembly.
    Type: Grant
    Filed: October 6, 2003
    Date of Patent: October 25, 2005
    Assignee: Seagate Technology LLC
    Inventors: Lucas Lee, YuNang Zai, James Chang, JiaHong Shu, PeiKoh 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
  • Disc drive actuator parking detector
    Publication number: 20050073769
    Abstract: A device for detecting an actuator assembly parking error when a disc drive is powered on includes a magnetic latch attached to the actuator assembly and a latch pin assembly electrically connected to a base plate in the disc drive, where the latch pin assembly is positioned to contact the magnetic latch only when the actuator's read/write head is positioned over a parking zone on the disc. A detection module is electrically connected to the magnetic latch and thus is able to detect whether or not the magnetic latch is contacting the latch pin assembly when the disc drive is powered on. A method for detecting an actuator assembly parking error includes powering on the disc drive, determining whether the magnetic latch has electrical contact with the latch pin assembly, and reporting a parking error if the magnetic latch does not have electrical contact with the latch pin assembly.
    Type: Application
    Filed: October 6, 2003
    Publication date: April 7, 2005
    Inventors: Lucas Lee, YuNang Zai, James Chang, JiaHong Shu, PeiKoh Lee