Patent ID: 7697867

Claim:
An image forming apparatus comprising: an image carrier on which an image is formed; a driving source that drives the image carrier; an image forming unit that forms the image on the image carrier based on image data; a transfer unit that transfers the image formed on the image carrier onto a transfer member; an image detecting unit that detects the image transferred onto the transfer member; and a control unit that controls the driving source, the image forming unit, and the transfer unit, wherein the control unit executes a fluctuation-pattern detecting process of forming a speed-fluctuation detecting image formed of a plurality of predetermined visual images on the image carrier, while causing the image carrier to rotate at a standard linear speed, transferring the speed-fluctuation detecting image onto the transfer member, and detecting a speed fluctuation pattern per single rotation of the image carrier based on detection time period intervals detected by the image detecting unit, for each visual image in the speed-fluctuation detecting image, a fine-tuning-pattern determining process of determining a driving speed fine tuning pattern per single rotation of the image carrier of the driving source based on the speed fluctuation pattern, and an image forming process of forming the image based on the image data while driving the driving source based on the driving speed fine tuning pattern, a process of forming the image based on the image data while causing the image carrier to rotate at a nonstandard linear speed that differs from the standard linear speed is executed as the image forming process, and a fine-tuning-pattern correcting process of correcting the driving speed fine tuning pattern based on the nonstandard linear speed is executed before the image forming process.