Patent ID: 6355389
Filing Date: 2002-03-12
Classification: G03G

Abstract:
A full color image forming method comprising:developing an electrostatic latent image formed on an image bearing member with a color developer including a color toner to form a color toner image on the image bearing member; first transferring the color toner image on the image bearing member onto an endless intermediate transfer material while applying a developing bias to the image bearing member and the intermediate transfer material; repeating the electrostatic latent image developing step and the first color toner transferring step a plurality of times using a plurality of different color developers to form a full color toner image on the intermediate transfer material; and second transferring the full color image onto a receiving material, wherein a weight of each of the color toner images formed on the image bearing member is from about 0.4 mg/cm2 to about 1.5 mg/cm2, and each of the color developers has a charge quantity not less than 15 &mgr;C/g in an absolute value, and wherein the following relationship is satisfied with respect to each of the first color toner transferring steps:5.4Ã—Q1+901<5.4Ã—Q1+150 wherein Vb represents the developing bias voltage in a unit of volt, V1 represents a potential of a background area of the electrostatic latent image in a unit of volt, on which the color toner image is not to be formed, and Q1 is the charge quantity of the color developer in a unit of &mgr;C/g.