Patent ID: 7643186

Claim:
An image forming device comprising: an image forming unit having a surface being configured to have a toner image formed thereon; a transfer belt being configured to have the toner image formed in the image forming unit transferred thereon; a position detection unit being configured to detect a predetermined position of the transfer belt; a first information sensor being configured to detect first information relating to a degree of reflection of the surface of the transfer belt at the predetermined position; a second information sensor being configured to detect second information relating to color concentration of a pattern image being formed to be read at the predetermined position; and an adjustment unit being configured to adjust toner concentration at the time of forming the image based on the first information and second information detected by the first information sensor and the second information sensor, the adjustment unit includes a detected information correction unit configured to correct the second information detected by the second information sensor using the first information detected by the first information sensor.