G03G 15/305

Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups [CPC: G03G13/02] - [CPC: G03G13/20] in which projection is obtained by line scanning in which projection is formed on a drum {with special means to synchronize the scanning optic to the operation of other parts of the machine, e.g. photoreceptor, copy paper}