摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus which prevents image noises when a counter development is performed using a DC bias development system. <P>SOLUTION: An absolute value of a fogging margin is made smaller than a default value so as to generate image noises easily (S501), and an electrostatic latent image of a test patch is formed on a peripheral surface of a photoreceptor drum by an exposing device (S502). Then, a density profile of the test patch is acquired (S503), and when image noise is determined to be generated (S504:YES), the absolute value of the fogging margin at a print time is made larger than the absolute value of the default value (S505), or otherwise (S504:NO), the fogging margin at a print time is made to be a default value (S506). <P>COPYRIGHT: (C)2013,JPO&INPIT |