Patents by Inventor Jian Qin Gong

Jian Qin Gong 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).

  • Method for unloading head without calibration in hard disk drives
    Patent number: 7804660
    Abstract: A hard disk drive with a voice coil motor coupled to a head. The disk drive includes a circuit that provides a drive current with a sinusoidal waveform to the voice coil motor during an unload routine. The back emf of the voice coil motor can be determined during a sample period when the current is essentially zero. There is no need to perform a resistance calibration. This reduces the time needed to unload the head.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: September 28, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jian Qin Gong, Chang Ik Kang