| 摘要 |
The invention relates to a direct printing apparatus in which computer generated image information is converted into a pattern of electrostatic fields, which selectively transport electrically charged particles from a particle carrier (33) toward a back electrode (12) through a printhead structure (5), whereby the charged particles are deposited in image configuration on an image receiving substrate (1). Variations in quality resulting from a change in the charge carried by each charged toner particle are mitigated by providing and arrangement for determining the humidity within the apparatus and means responsive to the determined humidity for controlling the electrode voltage sources and/or the back electrode voltage source to modify the electric field between the particle carrier and back electrode. |
