Patent ID: 8903257
Filing Date: 2014-12-02
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an electrostatic latent image support member; an electrostatic latent image forming section for forming an electrostatic latent image on the electrostatic latent image support member in accordance with image data; a developer support member for supporting a developer composed of toner and carriers and for supplying the toner to the electrostatic latent image support member to develop the electrostatic latent image; a first voltage applying device for applying a developing bias voltage that is a superimposed voltage of a first DC voltage and a first AC voltage to the developer support member; and a controller for controlling the first voltage applying device such that the first voltage applying device stops an output of the first AC voltage at a first frequency, changes the first DC voltage outputted therefrom from a first voltage value to a second voltage value and starts an output of the first AC voltage at a second frequency, in this order, wherein when image data for a series of pages are printed out, the controller selects a screen ruling for each of the pages in accordance with image data for each of the pages and determines the output from the first voltage applying device in accordance with the selected screen ruling.