Image forming apparatus that performs exposure for discharging photoconductive drum

An image forming apparatus comprising:

• a plurality of photoconductive drums;
• a plurality of light emitting units each of which emits light with which a corresponding one of the photoconductive drums is exposed in a case where a driving current is supplied, the light emitting units being separately provided correspondingly to the plurality of photoconductive drums;
• a transfer belt configured to be rotatably driven and onto which toner images formed on the plurality of photoconductive drums are transferred;
• a driving unit that supplies the driving current to each of the light emitting units in accordance with a drive signal, the drive signal being an ON/OFF signal by which the light emitting units are turned on or off;
• and
• a controller that transmits the drive signal to the driving unit, the controller selectively transmitting the drive signal generated on a basis of input image data for forming an electrostatic latent image on each of the photoconductive drums or the drive signal a duty ratio of which is 100% for performing discharging of the photoconductive drums,
• wherein the plurality of photoconductive drums includes a first photoconductive drum, a second photoconductive drum, a third photoconductive drum, and a fourth photoconductive drum, and the first photoconductive drum, the second photoconductive drum, the third photoconductive drum, and the fourth conductive drum are arranged along a rotation direction of the transfer belt, and
• wherein light emission of each of the light emitting units for discharging a corresponding one of the photoconductive drums is executed during a period that is equal to or more than one rotation cycle of the photoconductive drum.