PURPOSE: To adjust printing quality extremely readily at a high response speed by providing the second charging process after charging and exposure and limiting the charging quantity of a photoreceptor by this.

CONSTITUTION: The electrostatic charge patterns corresponding to the information to be recorded are formed on the surface of a photoreceptor 1 which has undergone exposure process. The second charger 4 which mirages the charge quantity of the patterns formed in this way to the polarity opposite from the charging polarity of a charger 2 relatively is provided. By selecting the charging voltage to be applied to this second charger 4 to a suitable value, the absolute values of the surface potential differences of the repsective portions may be changed while the surface potential differences of the exposed parts and unexposed parts are held maintained approximately constant. In this way, the extremely easy and extremely fast response adjustment of printing quality may be performed.