| 摘要 |
The invention relates to an image forming apparatus in which image information is converted into a pattern of electrostatic fields for modulating a transport of charged toner particles from a particle carrier toward a back electrode member. The image forming apparatus includes a background voltage source for producing a background electric field which enables a transport of charged toner particles, a printhead structure arranged in said background electric field at a predetermined distance from said toner carrier, said printhead structure including a plurality of apertures and control electrodes arranged in conjunction to the apertures, each of said control electrodes having a predetermined area, control voltage sources for supplying control potentials to said control electrodes; said control potentials being arranged so as to allow said transport of toner particles, thereby forming a predetermined toner release pattern; and an image receiving member caused to move in relation to the printhead structure for intercepting the transported charged particles. The invention is characterized in that each area of said control electrodes is greater than a predetermined value which corresponds to a time period during which said toner release pattern can be upheld in the presence of any occurring surface charges building up on said printhead structure. The invention also relates to a printhead structure for said image forming apparatus and a method for manufacturing said image forming apparatus.
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