Patents by Inventor Bruce Cheng-Chih Chen

Bruce Cheng-Chih Chen 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).

  • Image forming apparatus and method for controlling developing bias voltage
    Patent number: 7991311
    Abstract: The present invention provides a method and apparatus for forming an image. A controller manages a charger and a developing bias voltage to increase an absolute value of the charging voltage to an image-bearing member and an absolute value of a developing bias voltage to a developer-bearing member to predetermined values in a plurality of steps. The controller controls the developing bias voltage applied to the developer-bearing member; wherein the following relation holds in each of the plurality of steps: |VD|>|Vi|, where VD represents a developing bias voltage applied to the developer-bearing member and Vi represents a charged potential of the image-bearing member. This invention is especially useful for mono-component development using DC voltage as a development driving mechanism.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: August 2, 2011
    Assignee: Aetas Technology Incorporated
    Inventors: Eric Chun-Wei Shih, Bruce Cheng-Chih Chen, Dianne Tan-Feng Tsai
  • Image forming apparatus and method for controling developing bias voltage
    Publication number: 20080101808
    Abstract: The present invention provides a method and apparatus for forming an image. A controller manages a charger and a developing bias voltage to increase an absolute value of the charging voltage to an image-bearing member and an absolute value of a developing bias voltage to a developer-bearing member to predetermined values in a plurality of steps. The controller controls the developing bias voltage applied to the developer-bearing member; wherein the following relation holds in each of the plurality of steps: |VD|>|Vi|, where VD represents a developing bias voltage applied to the developer-bearing member and Vi represents a charged potential of the image-bearing member. This invention is especially useful for mono-component development using DC voltage as a development driving mechanism.
    Type: Application
    Filed: October 26, 2006
    Publication date: May 1, 2008
    Inventors: Eric Chun-Wei Shih, Bruce Cheng-Chih Chen, Dianne Tan-Feng Tsai