Patent ID: 6427055
Filing Date: 2002-07-30
Classification: G03G

Abstract:
An image forming apparatus comprising:a charging member contacting or adjoining a photoconductive element for uniformly charging a surface of said photoconductive element; latent image forming means for,forming a latent image on the surface of said photoconductive element uniformly charged; developing means for developing the latent image with toner by reversal development to thereby form a corresponding toner image; a temperature sensor responsive to ambient temperature around said image forming apparatus; voltage applying means for applying a DC voltage to said charging member; a photosensor responsive to a reflection density of the surface of said photoconductive element; voltage control means for varying the DC voltage in correspondence to a non-image area of the surface of said photoconductive element at preselected intervals, causing said photosensor to sense the deflection density of the surface of said photoconductive element before and after a variation of said DC voltage, and controlling a voltage to be applied from said voltage applying means to said charging member in accordance with a ratio between resulting outputs of said photosensor; and decision means for determining whether or not to cause said voltage control means to execute control over the voltage.