Electrode element for applying unipolar electrical charges to dielectric surface

摘要

The electrode element has a corona electrode extending in the longitudinal direction, two auxiliary electrodes (42,62) between the corona electrode and the surface and a carrier which positions the corona electrode and the auxiliary electrodes relative to each other. A first and second auxiliary electrode holder (38,50) are movable to enable the distance (A) between the auxiliary electrodes to be varied between a maximum and a minimum distance. The distance can be fixed at the maximum, minimum and a number of intermediate distances.