| 摘要 |
A printhead structure (106) for use in a DEP (Direct Electrostatic Printing) device is provided, made from an insulating material comprising control electrodes in combination with printing apertures, characterised in that : (i) the printhead structure comprises individual control electrodes (106a), each of the individual control electrodes being combined with at least one aperture (107), on one side of the printhead structure, (ii) each of the individual control electrodes (106a) is located on the same side of the insulating material and (iii) the apertures are rectangles with an aspect ratio (AR), defined as the ratio of the width of the apertures in their long axis (WL) over the width of the apertures in a direction perpendicular to this long axis (WD), larger than 1. In a preferred embodiment each single control electrode controls two printing apertures with AR > 1 and these two apertures are separated by a portion of the control electrode controlling them. <IMAGE>
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