Patents by Inventor Chien-Chien Chung

Chien-Chien Chung 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).

  • Spring-free type focusing and defocusing mechanism for a digital camera
    Patent number: 5970262
    Abstract: A focusing and defocusing mechanism incorporated in a digital camera lens for simplifying the lens structure. The mechanism includes an outer lens barrel, a cam barrel having a slot of multiple slopes for adapting to the outer lens barrel, a guide pin affixed onto the outer wall of the outer lens barrel for rotating into the slot of the multiple slopes, and controlling elements affixed to the guide pin for controlling the distance and movement of the guide pin on the slot of multiple slopes.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: October 19, 1999
    Assignee: Umax Data Systems Inc.
    Inventors: Kou-Lung Tseng, Wei-Hsin Hwang, Chao-Soon Chen, Shih-Min Lo, Jang-Yan Hung, Chien-Chien Chung