Patents by Inventor Park Sang Jo

Park Sang Jo 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).

  • Iris circuit of a video camera
    Patent number: 5053878
    Abstract: An iris circuit of a video camera which can automatically adjust opening and shutting of the iris of a camera lens according to the magnitde of a NAM (non additive magnitude) signal provided by taking out the highest value from the peak values of R,G and B color video signals. The iris circuit includes means for detecting each of the peak value and the means value of the NAM signal, and mean for combining the peak value and the mean value for providing an iris driving voltage so that the iris may be open or shut according to the magnitude of the NAM signal.
    Type: Grant
    Filed: July 12, 1989
    Date of Patent: October 1, 1991
    Assignee: SamSung Electronics Co. Ltd.
    Inventors: Park Sang Jo, Lee Sang Ho, Eom Young Ku