A method of printing in a device for direct electrostatic printing comprising a printhead structure with deflection electrodes and a means for electrically controlling said deflection electrodes.

摘要

A device for direct electrostatic printing with an addressability AD in dots per cm having a means for delivering charged toner particles coupled to a means for applying a first electric potential (DC1) and a means (DC4) for applying an electric field between the means for delivering toner particles and an image receiving substrate (108). The electric potential difference |DC4-DC1| creates a flow of the charged toner particles (104) towards the substrate. In the flow of toner particles a printhead structure is placed having printing apertures, control electrodes associated therewith and deflection electrodes. Between the printhead structure and the image receiving substrate, a gap, d_B, is left so that $$ {\text{((|DC4-DC1|)/d}}_{\text{B}}\text{) = R1 ≤ 1.5 V/µm}$$. The deflection electrodes are coupled to a voltage source for applying a varying voltage to the deflection electrodes. Preferably that varying voltage has a peak to peak value, V_p, so that $$ {\text{V}}_{\text{p}}\text{/R1 250 µm}$$.