| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately obtain a toner consumption in an image forming apparatus. <P>SOLUTION: Pieces of gradation data indicating the sizes of toner dots to be formed are integrated by a first counter 261, and the total length of the dots to be formed in a given period of time is obtained. The dot sizes are determined by a determination circuit 251. The specific size dots of all the dots are counted by a second counter 262. The dot sizes with the rates of toner attachment which greatly differ from a fixed value are selected as the specific size. The approximate value of toner consumption, expressed by the product of the integrated value d1 held in the first counter 261 and a coefficient K corresponding to a toner sticking ratio, a correction addition value expressed by the product of the number d2 of the specific size dots held in the second counter 262 and a coefficient m, and an offset value Coff corresponding to a quantity of toner consumed other than the formation of toner images are summed up. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
