Patent ID: 8554093

Claim:
An image forming apparatus comprising: an image carrier configured to have a toner image formed thereon while rotating; a transfer member configured to be conveyed in a conveying direction while being in contact with said rotating image carrier; a transfer unit configured to transfer the toner image formed on said image carrier to a surface of said transfer member; a correction unit configured to form a toner image for detection on said image carrier, and correct image forming conditions based on an amount of toner obtained by reading the toner image for detection transferred to said transfer member by said transfer unit; a first reading unit configured to be disposed upstream of said transfer unit in the conveying direction of said transfer member, and read the surface of said transfer member being conveyed in the conveying direction; a second reading unit configured to be disposed downstream of said transfer unit in the conveying direction of said transfer member, and read the surface of said transfer member being conveyed in the conveying direction; a storage unit configured to store outputs from said first reading unit as a first profile, and store outputs from said second reading unit as a second profile; and a toner density calculation unit configured to calculate a toner density of the toner image for detection based on the first profile and the second profile stored in said storage unit, wherein said correction unit corrects image forming conditions based on the toner density calculated by said toner density calculation unit.