| 摘要 |
The invention relates to an image forming apparatus, in which an image information is converted into a pattern of electrostatic fields for modulating a transport of charged toner particles from a particle carrier towards an image receiving surface, said image forming apparatus including: a background voltage source for producing a background electric field which enables a transport of chardged toner particles from said particle carrier towards said image receiving surface; a printhead structure arranged in said background electric field, including a plurality of apertures and control electrodes arranged in conjunction to the apertures; control voltage sources for supplying control potentials to said control electrodes in accordance with the image information to selectively permit or restrict the transport of charged toner particles from the particle carrier through the apertures; said image receiving surface being arranged for movement in relation to the printhead structure for intercepting the transported charged toner particles in an image configuration; said printhead structure presenting a first surface facing the particle carrier and a second surface facing facing the image receiving surface; and said printhead being formed by a substrate bulk having a predetermined bulk resistance, wherein said first and second surface present a predetermined first surface resistance and second surface resistance, respectively. The invention is characterized in that said printhead structure is manufactured from a material which is chosen and handled so that at least said first surface resistance is greater than a predetermined limit value which corresponds to essentially no risk for electrical short circuiting of said printhead structure surface. The invention also relates to a printhead structure for an image forming apparatus, a method for manufacturing an image forming apparatus and a method for operating an image forming apparatus. |
