Patent ID: 9665034
Date: 2017-05-30
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image forming unit comprising a first photosensitive member and a second photosensitive member, the image forming unit being configured to expose the first photosensitive member and the second photosensitive member to light based on image data, and to develop electrostatic latent images formed on the first photosensitive member and the second photosensitive member by exposure to the light with toners of different colors; an endless transfer belt stretched around a plurality of rollers and driven to rotate, wherein a toner image on the first photosensitive member and a toner image on the second photosensitive member are transferred onto the endless transfer belt; a transfer unit configured to transfer the toner images on the endless transfer belt onto a recording medium entering a transfer nip formed between the transfer unit and the endless transfer belt, wherein in a direction of rotation of the endless transfer belt, a second transfer portion at which the toner image on the second photosensitive member is transferred onto the endless transfer belt is arranged between a first transfer portion at which the toner image on the first photosensitive member is transferred onto the endless transfer belt and the transfer unit; a holding unit configured to hold recording media; a conveyance unit configured to convey the recording medium held by the holding unit to the transfer nip; a storage unit configured to store delay data indicating an amount of delay of an exposure start timing of the second photosensitive member with respect to an exposure start timing of the first photosensitive member for forming electrostatic latent images corresponding to one recording medium, wherein the delay data includes: first delay data indicating the amount of delay of the exposure start timing of the second photosensitive member; and second delay data indicating the amount of delay of the exposure start timing of the second photosensitive member, and the amount of delay based on the second delay data is larger than the amount of delay based on the first delay data; and a control unit configured to delay the exposure start timing of the second photosensitive member with respect to the exposure start timing of the first photosensitive member on image formation corresponding to one recording medium, wherein in a state in which an image forming job for forming the images on a plurality of the recording media is inputted, the control unit controls the exposure start timing of the second photosensitive member based on the first delay data until a first recording medium included in the plurality of the recording media enters the transfer nip and controls the exposure start timing of the second photosensitive member based on the second delay data after the first recording medium enters the transfer nip.