| 摘要 |
<p>A direct electrostatic printing method performed in consecutive print cycles in which control signal pulses are applied on the one hand between a toner particle source and a back electrode and, on the other hand, between the toner particle source and electrodes on a printhead structure interposed between the toner particle source and the back electrode. The pulses are so controlled as to be in accordance with an image configuration to generate a pattern of electrostatic fields which selectively permit or restrict the transport of charged toner particles from the particle source toward the back electrode via the printhead structure. Each pulse signal is either itself frequency pulse modulated or supplemented by an overlaid frequency pulse modulated signal to produce intermittent electric forces which, in a first time phase, attract and transport charged toner particles from the particle source to the printhead structure and, in a second time phase, accelerate the particles towards the back electrode and away from the printhead structure in a convergent, focusing electric field. <IMAGE></p> |
