To restrain discharge product gas from being produced and to reduce energy consumption.
In a color laser printer 10, whether an ordinary mode is set or a low charging voltage mode is set is designated from a user by the use of a low charging voltage mode selection button 17a or the like. When it is designated to the low charging voltage mode, a CPU 12 allows an applied voltage variable circuit 23a to control so that voltage may be lower voltage than usual (voltage in a range where an electrostatic latent image is formed and a printed image can be formed) so as to charge a photoreceptor 63 by a non-contact type charging body 22, and allows a driving circuit 26a to control so that the revolving speed of a gas discharge fun 26 is made lower than usual, and then printing is performed.
ISHIBASHI OSAMU