Patent ID: 6954598

Claim:
An image forming apparatus comprising: an original table; a reading section which optically reads an image on an original set on the original table; a printing section which divides each picture element of the image read in the reading section into a plurality of picture elements, forms a latent image on a photosensitive member in accordance with the divided picture elements, and then develops the latent image with a developing agent to print it on a paper-sheet; a picture element counter which counts, the number G of the divided picture elements which become targets of the development among the divided picture elements; a first memory section which stores the number Gs of reference divided picture elements per unit area rate of a print area rate on the paper-sheet, when the original of a reference size on which the image is depicted at a standard print area rate Es is read by the present apparatus and printed on the paper-sheet; a first calculating section which calculates a print area rate E on the paper-sheet by dividing the counted value G of the picture element counter by the number Gs of the reference divided picture elements in the first memory section; a sheet number counter to count the number U of the used paper-sheets; a second calculating section which accumulates results E calculated in the first calculating section and calculates an average print area rate Ea by dividing the accumulated value by the counted value U of the sheet number counter; and an informing section which informs the counted value U of the sheet number counter and the average print area rate Ea calculated in the second calculating section, and informs the print area rate E last calculated at present among the print area rates E calculated in the first calculating section.