Patent ID: 9733608
Date: 2017-08-15
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image bearing member; a charging member for electrically charging said image bearing member at a charging portion; a developing member for forming a developer image on said image bearing member charged by said charging member; a transfer unit for transferring the developer image onto a transfer material at a transfer portion; a pre-charging exposure unit for exposing to light a surface of said image bearing member which passes through the transfer portion and before said image bearing member reaches the charging portion; a voltage receiving member for receiving a voltage; a measuring portion for measuring a first value of a voltage applied to said voltage receiving member when constant-current control is effected; and a controller for determining a light quantity of said pre-charging exposure unit during image formation based at least on the measured first value of the voltage and a second value of the voltage, wherein said controller includes: