Method and apparatus for background control in an electrostatographic printing machine.

摘要

The electrostatographic printing apparatus has an imaging member and an imaging system for transmitting a light image of the original input document onto the imaging member to produce a latent image of the original input document. The optical density of the light image being transmitted by said imaging system is sensed. A detector is coupled to the sensor for detecting image information in the transmitted light image. The exposure lamp voltage, and/or the developer bias, charging potential, as well as other variable parameters are set to predetermined settings in response to the detection of image information in the original input document.