| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an image forming apparatus, wherein the film thickness of the photoreceptor layer of an image holder is calculated based on an AC current supplied to the photoreceptor layer from a charging member. <P>SOLUTION: A current (discharge current) is detected which is caused to flow into the photoreceptor layer 12 from the charging member 16 due to discharge. From a relation between the current and the film thickness of the photoreceptor layer, the film thickness is calculated. The integral value of the discharge current is obtained (a discharge current information calculating section 36), and based on the integral value, the layer thickness is calculated (film thickness calculating section 38). Alternatively, from a variation in the peak value of a discharge current, the film thickness is calculated. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
