Proceedings PaperCharge emission stability of ionographic print heads
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Stable charge emission from ionographic printheads is a crucial for high quality printing. Differences in gray scale and dot size will occur with varying amounts of emitted charge. Charge output analysis on Delphax printheads, using RF-bursts for charge generation have been conducted. Significant variations between negative and positive charge output has been recorded. It has been shown that these variations can be evoked by differences of dielectric surface charging rates during oppositely charged particles emission. High instability in negative charge output, particularly at the beginning of RF burst has been observed. Charge output stability has been significantly improved by enlarging of ratio between speed of RF-voltage increase and rate of dielectric surface charging, along with increasing the number of ionization sites. Improvements of two orders have been experimentally confirmed.