| 摘要 |
The present invention provides a contact type charging device for applying a lower frequency AC voltage in combination with a DC voltage to an electric charger so as to suppress generation of noise in the electric charger as well as eliminate a Moire image in a half tone image when the DC voltage is overlapped with the lower frequency AC voltage, thus enabling to improve a charge uniformity. The charging device includes: an electric charger 1 that is in contact with an electrostatic latent image carrier 100 and applies a predetermined voltage to the electrostatic latent image carrier 100 for charging it; and a power source consisting of a DC power source 13 and an AC power source 15 for applying to the electric charger 1 a DC voltage in combination with an AC voltage. The AC power source 15 has a frequency of a predetermined value corresponding to a latent image to be formed on the electrostatic latent image carrier 100.
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