There is provided a device for direct electrostatic printing comprising a back electrode (105), a printhead structure (106), an array of printing apertures (107) in said printhead structure (106) through which a particle flow can be electrically modulated by a control electrode (106a), an image receiving...http://www.google.de/patents/US5900893?utm_source=gb-gplus-sharePatent US5900893 - Direct electrostatic printing device wherein the speeds of a magnetic brush and a receiving substrate are related to each other
