Patent ID: 7890029

Claim:
An image forming apparatus comprising: an electrostatic latent image bearing member on which an electrostatic latent image is to be formed; and a developing device that has a developer bearing member and develops the electrostatic latent image formed on the electrostatic latent image bearing member with a toner by applying an alternating voltage superimposed on a DC voltage, to the developer bearing member, the alternating voltage to be applied having an alternating voltage waveform in which a development-side potential to move a toner from the developer bearing member to the electrostatic latent image bearing member and an opposite development-side potential to move a toner from the electrostatic latent image bearing member to the developer bearing member alternate with each other, and in the alternating voltage, a first period during which a first peak-to-peak voltage being applied and a second period during which a second peak-to-peak voltage lower than the first peak-to-peak voltage being applied are alternately repeated and a frequency f 1 of the alternating voltage in the first period and a frequency f 2 of the alternating voltage fin the second period have a relation of f 1 =f 2 .