| 摘要 |
PROBLEM TO BE SOLVED: To accurately estimate an error in the amount of toner to be supplied.SOLUTION: A CPU 67 accumulates, with a count accumulation part 1115, new video count values to a count accumulation value ΣC to update the count accumulation value ΣC, and calculates the average value X of a difference ΔDn between an output value Dn from an inductor sensor 20 and a target value Dnref during a period from the previous supply of toner and the present supply of toner. When a toner supply signal is turned on, the CPU 67 estimates, with a toner density estimation part 1107, an estimated toner density EC inside a developing unit 44 from the count accumulation value ΣC and a prescribed amount of supply that is a nominal amount of supply, and estimates, with a supply amount error estimation part 1108, an error in the amount of toner to be supplied on the basis of a difference between the estimated toner density EC and the average value X.SELECTED DRAWING: Figure 5 |
