| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of detecting changes in a surface state of a transfer member with high accuracy and maintaining excellent image qualities.SOLUTION: The image forming apparatus comprises: photoreceptor drums 101Y, 101C, 101M, 101K, charging units 301Y, 301C, 301M, 301K, an exposure unit 200, developing units 102Y, 102C, 102M, 102K, primary transfer units 106Y, 106C, 106M, 106K, photoreceptor cleaning units 308Y, 308C, 308M, 308K, a fixing unit 111 having a fixing belt 67, a reflective optical sensor 168 having light-emitting parts E1 to E11 emitting a reference light spot and a detection light spot, a main unit control section 400, and other components. The main unit control section 400 determines a surface state of the fixing belt 67 on the basis of a quotient derived from a detection value from the reference light spot BP and a detection value from the detection light spot OP of the reflective optical sensor 168. |
