Patent ID: 7912385
Filing Date: 2011-03-22
Classification: G03G

Abstract:
1. A developer level calculating method of an image forming apparatus, the image forming apparatus comprising: a developing unit which comprises a developing roller which supplies a developer to a photosensitive body, a developer sensor which senses a developer level and a supplying roller which supplies the developer to the developing roller, and a developer bottle which is detachably provided to the developing unit and supplies the developer to the developing unit, the method comprising: calculating a number of first printing dots; sensing the developer level by using the developer sensor; supplying the developer from the developer bottle to the developing unit; calculating a number of second printing dots on the basis of the amount of the supplied developer; and calculating a number of third printing dots on the basis of the number of the first and the second printing dots, and calculating the developer level of the developer bottle on the basis of the number of the calculated third printing dots.