| 摘要 |
PROBLEM TO BE SOLVED: To quickly obtain an image having a stable density without unnecessary consumption of toner. SOLUTION: A time t1 of the latest execution of image density control is read out from a memory 20 provided in a process cartridge C to calculate a difference t2-t1 between the time t1 and a present time t2, and this difference is compared with a prescribed time Td (S1). In the case of (t2-t1)>=Td, image density control is executed (S2), and the time t2 is stored as the new time t1 in the memory 20 (S3). In the case of (t2-t1)<Td, image density control is not executed. |
