Patent ID: 7770987
Filing Date: 2010-08-10
Classification: G03G

Abstract:
1. An image forming apparatus capable of detecting a toner consumption amount of an image, comprising: a dot counter for counting a number of turned-on dots for each of the plurality of sub-lines of the image, the plurality of sub-lines each corresponding to a light-emitting amount and dividing a pixel of the image into a plurality of sub-pixels; a sub-line counter for outputting a sub-line number for each of the plurality of sub-lines whose light emitting amount is periodically changed at respective dots; a sub-line weight factor memory for keeping a weight factor for each of the plurality of sub-lines; a light emitting amount calculating section for calculating a light emitting amount for a selected sub-line, the light emitting amount being based on the number of turned-on dots for the selected sub-line outputted from said dot counter, and the sub-line weight factor outputted for the selected sub-line from said sub-line weight factor memory, using a selected sub-line number of the selected sub-line from the sub-line counter; and a summation section for summating light emitting amounts calculated at said light emitting amount calculating section for all sub-lines to obtain a summated amount, the toner consumption amount being calculated based on said summated amount.