Patent ID: 8548344
Filing Date: 2013-10-01
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member on which an electrostatic image is formed; a developer container that receives a developer; a developer carrying member that includes a first electrically conductive member and conveys the developer so as to develop the electrostatic image; a developer feed member that includes a second electrically conductive member and a surface foam layer provided around said second electrically conductive member, and rotates in a contact manner with said developer carrying member, thereby to feed the developer to said developer carrying member; a detection device that detects an electrostatic capacitance between said first electrically conductive member and said second electrically conductive member; and a control unit that updates information relating to an amount of developer remaining in said developer container based on the electrostatic capacitance, which is detected by said detection device after said developer feed member rotates at a predetermined speed for at least a predetermined time.