Abstract
Wire anode of DC corona charger used in electrophotographic process is degraded by discharging. This causes deterioration of copy quality. Then, change of tungsten wire anode and the relationship between this change of tungsten wire anode and copy quality were investigated to make these phenomena clear. Anode was analyzed by using SEM, TEM, XMA and FT-IR. Copy quality and discharging current distribution of charger were also examined.
Stable amorphous needles and film consisted of SiO2 and WO3 were observed to grow on anode by discharging. And, it was decided that growth of needles caused decrease of discharge current and copy density. It is discussed that the growth of products is caused by plasma oxidation of gases which contain Si in the air and chemical sputtering of tungsten wire anode which are induced by corona discharging.
