Patent ID: 6163661
Filing Date: 2000-12-19
Classification: G03G

Abstract:
An electrostatic image forming apparatus comprising:an image carrier for forming a toner image thereon;a corona discharger facing said image carrier and having a conductive casing and a discharge wire disposed in said casing, and for effecting corona discharge at a rear of a recording medium fed thereto, wherein the corona discharger charges the recording medium to a polarity opposite to a charge polarity of the toner image formed on said image carrier and thereby transfers the toner image to the recording medium;voltage changing means for applying a voltage of substantially a same polarity as a charge of the toner image to at least said discharge wire of said corona discharger, and for changing said voltage;environment sensing means for sensing an environment in which said apparatus is situated, the environment sensed including a temperature and a humidity of said apparatus; andcontrol means for controlling, based on the environment sensed, the voltage to be applied by said voltage changing means.