Image forming apparatus

An image forming apparatus for executing a print job in which a print image is formed on a single or a plurality of recording materials by one start instruction and the single or the plurality of recording materials are discharged from an inside to an outside of the image forming apparatus through a recording material discharge opening, the image forming apparatus comprising:

• toner image forming means for forming a toner image;
• a rotatable image bearing member for bearing the toner image, on a surface thereof, formed by the toner image forming means;
• a driving portion for rotationally driving the image bearing member;
• transfer means for transferring the toner image, onto the recording material, formed on the surface of the image bearing member;
• and
• an optical sensor which includes a light emitting element for emitting light toward the surface of the image bearing member and a light receiving element for receiving reflected light reflected after emission of the light from the light emitting element toward the surface of the image bearing member and for outputting a detection signal depending on a light reception amount and which is for detecting the reflected light in a detecting position in a movement direction of the surface of the image bearing member,
• wherein the image forming apparatus comprises a controller capable of carrying out control of the driving portion during execution of the print job so that a time from passage, through the detecting position, of a trailing end of an image forming region of the surface of the image bearing member with respect to the movement direction, where the toner image to be transferred onto a final recording material in the print job is formable until rotation of the image bearing member is stopped in a case where a numerical value related to a detection signal output after receiving the reflected light by the light receiving element after the passage, through the detecting position, of the trailing end of the image forming region of the surface of the image bearing member with respect to the movement direction, where the toner image to be transferred onto the final recording material is formable satisfies a predetermined condition is made longer than that in a case where the numerical value related to the detection signal does not satisfy the predetermined condition.