Patent ID: 9671712
Date: 2017-06-06
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: a photosensitive drum which rotates; a charging roller which is arranged so as to come into contact with or close to the photosensitive drum; a power source which applies voltage to the charging roller to charge the photosensitive drum; a toner-image forming unit which performs image exposure on the charged photosensitive drum based on an image signal, and then forms a toner image on the photosensitive drum by depositing a toner thereon; a detecting member which detects a DC current flowing from the charging roller to the photosensitive drum; a driving source which drives to rotate the photosensitive drum; and an execution unit which executes a detection mode to detect the DC current, flowing from the charging roller to the photosensitive drum, with the detecting member when the voltage is applied to the charging roller in a state in which the photosensitive drum is rotated, in a period other than a period during which the toner image is formed on the photosensitive drum, the execution unit sets a speed at which the photosensitive drum is rotated by the driving source at the time when the detection mode is executed to be faster than any speed in the period during which the toner image is formed by the toner-image forming unit.