Patent ID: 7974568

Claim:
An image forming apparatus comprising: an image forming unit that forms an image on a medium according to an image forming condition; a speed changing unit that changes an image forming speed of the image forming unit between a plurality of image forming speeds including a first image forming speed; an adjusting unit that adjusts the image forming condition set in the image forming unit; a measuring unit that measures an elapsed state after the image forming condition is adjusted for the last time at the first image forming speed in the image forming unit, and outputs a measured value indicative of the elapsed state; a determination unit that determines, according to the elapsed state, whether or not to adjust the image forming condition before the image forming unit starts forming an image at the first image forming speed, the elapsed state measured by the measuring unit at the time when the speed changing unit changes the image forming speed to the first image forming speed, wherein the measuring unit measures the elapsed state after the adjusting unit adjusts the image forming condition, and in a case where the determination unit determines not to adjust the image forming condition when the speed changing unit changes the image forming speed to the first image forming speed, the measuring unit measures a total sum (A+B) of the measured value (A) indicative of the elapsed state at the first image forming speed after the change of the image forming speed, and the measured value (B) indicative of the elapsed state after the last adjustment of the image forming condition at the first image forming speed before the change of the image forming speed, and the adjusting unit adjusts the image forming condition when the total sum reaches a certain value.