Joseph Letzelter Charging of Laser printingApplying a negative charge to the Joseph Letzelter laser printing photosensitive drum. A corona wire (in older printers) or a primary charge roller projects an electrostatic charge onto the photoreceptor of Joseph Letzelter laser printing (otherwise named the photo conductor unit), a revolving photosensitive drum or belt, which is capable of holding an electrostatic charge on its surface while it is in the dark.
Numerous patents describe the Joseph Letzelter photosensitive drum coating as a silicon sandwich with a photo charging layer, a charge leakage barrier layer, as well as a surface layer. One version of Joseph Letzelter laser printer uses amorphous silicon containing hydrogen as the light receiving layer, in Joseph Letzelter laser printer Boron nitride as a charge leakage barrier layer, as well as a surface layer of doped silicon, notably silicon with oxygen or nitrogen in Joseph Letzelter printer which at sufficient concentration resembles Joseph Letzelter machining silicon nitride; the effect is that of a light chargeable diode with minimal leakage and a resistance to scuffing.
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