Patent Number: 6,427,054

Title: Image forming apparatus indicating the residue of toner and the deficiency of toner

Abstract: An image forming apparatus includes an image bearing member, an electrostatic image forming device for forming an electrostatic image based on an image signal on the image bearing member, a developing device for developing the electrostatic image on the image bearing member, a detector for detecting the amount of a toner in the developing device, an integrating device for integrating a number of image signals produced by the apparatus, and an estimator for estimating and indicating whether the apparatus has consumed a predetermined amount of toner, on the basis of the integrated amount integrated by the integrating device before the detector detects the consumption of all the toner.

Inventors: Ohkubo; Masaharu (Yokohama, JP), Matsuguma; Minoru (Susono, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G03G 15/08 (20060101); G03G 015/00 ()

Expiration Date: 07/30/2019